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HomeMy WebLinkAboutStorm Water 1-5 BLD-2018-0075 1506 Latitude Circle EXHIBIT "B" 1506 LATITUDE CIRCLE �^Y"vA1 LOT 11, PLAT OF 48 NORTH P133669 Responses to the "13 Elements of SWPPP" (Construction Stormwater Pollution Prevention Plan) ELEMENT 1: Preserve Vegetation/Mark Clearing Limits The clearing limits will be marked by using either BMP C233: Silt Fence, or BMP C103: High Visibility Plastic or Metal Fence, as shown on the Erosion Control Plan. C233 is to be used along the north property lines and the C103 along the east and south property lines. Preservation of the native top soil will be preserved as much as is practical by use of a stock pile as shown on the Erosion Control Plan. Stock pile location may vary. Stock pile shall be protected as indicated on the Erosion Control Plan. ELEMENT 2: Establish Construction Access BMP C105 shall be used as the construction access. Only one access point is proposed. No wheel wash is proposed. Any track out shall be cleaned daily by shoveling and/or sweeping. More frequent cleaning as necessary. ELEMENT 3: Control Flow Rates No flow rate controls are designed for the individual lot. However, erosion control BMPs described in ELEMENT 4, below will reduce velocity of flows. ELEMENT 4: Install Sediment Controls The following BMPs are proposed as temporary sediment controls: C233: Silt Fence To be place along the perimeter of the site to protect downstream properties from the transport of coarse sediment, as well as to mark the clearing limits for the construction crew and to alert the public as to the potential dangers of the ongoing onsite construction activity. C105: Stabilized Construction Entrance To be place in the location of the proposed driveway off of Latitude Circle, to provide a stable and clean point of access for construction vehicles. C121: Mulching To provide immediate temporary protection of exposed soil from erosion, as well as conserving moisture. C123: Plastic Covering Primarily used to protect the stock pile from erosion. May be used as a short term cover of small areas of exposed soil. Not intended for large areas. C140: Dust Control As this project will be constructed during the dry season, dust control may be necessary to protect the surrounding neighborhood. The primary source of dust control will be from spraying of the disturbed area with water. C220: Storm Drain Inlet Protection Onsite inlet protection will use Block & Gravel Curb Inlet Protection. Offsite inlet protection will use Catch Basin Filters manufactured for use at construction sites. C207: Check Dams Where drainage swale are created to convey stormwater, temporary gravel check dams may be used to reduce velocity and to dissipate flow energy. The following BMP improvement(s) are proposed for permanent sediment controls: C124: Sodding Sodding is to establish permanent turf for immediate erosion protection. C125:Top Soiling Provides a suitable growth medium for final site stabilization with vegetation. T5.13: Post-Construction Soil Quality and Depth Establishes soil quality and depth regains greater stormwater functions in the post development landscape, provides increased treatment of pollutants and sediments that result from development and habitation. ELEMENT 5: Soil Stabilization The following are temporary soil stabilization BMPs: C233: Silt Fence To be place along the perimeter of the site to protect downstream properties from the transport of coarse sediment, as well as to mark the clearing limits for the construction crew and to alert the public as to the potential dangers of the ongoing onsite construction activity. C105: Stabilized Construction Entrance To be place in the location of the proposed driveway on Latitude Circle,to provide a stable and clean point of access for construction vehicles. C121: Mulching To provide immediate temporary protection of exposed soil from erosion, as well as conserving moisture. C123: Plastic Covering Primarily used to protect the stock pile from erosion. May be used as a short term cover of small areas of exposed soil. Not intended for large areas. C140: Dust Control As this project will be constructed during the dry season, dust control may be necessary to protect the surrounding neighborhood. The primary source of dust control will be controlled spraying of the disturbed area with water. C220: Storm Drain Inlet Protection Onsite inlet protection will use Block & Gravel Curb Inlet Protection. Offsite inlet protection will use Catch Basin Filters manufactured for use at construction sites. C207: Check Dams Where drainage swale are created to convey stormwater,temporary gravel check dams may be used to reduce velocity and to dissipate flow energy. The following are permanent soil stabilization BMPs: C124: Sodding Establishes permanent turf for immediate erosion protection. C125:Top Soiling Provides a suitable growth medium for final site stabilization with vegetation. T5.13: Post-Construction Soil Quality and Depth Establishes soil quality and depth regains greater stormwater functions in the post development landscape, provides increased treatment of pollutants and sediments that result from development and habitation. ELEMENT 6: Protect Slopes C122: Nets and Blankets Nets and Blankets are intended to prevent erosion and hold seed and mulch in place on steep slopes and in channels so vegetation can become well established. C235: Straw Wattles Straw Wattles reduce the velocity and can spread the flow of rill and sheet runoff, and can capture and retain sediment. ELEMENT 7: Protect Drain Inlets C220: Storm Drain Inlet Protection Onsite inlet protection will use Block & Gravel Curb Inlet Protection. Offsite inlet protection will use Catch Basin Filters manufactured for use at construction sites. ELEMENT 8: Stabilize Channels and Outlets C207: Check Dams Where drainage swale are created to convey stormwater,temporary gravel check dams may be used to reduce velocity and to dissipate flow energy. ELEMENT 9: Control Pollutants All fuel, lubricants, paint, and/or other hazardous material shall be stored in a lockable, covered storage container if kept on site. ELEMENT 10: Control De-Watering While excavating to install the sanitary sewer, stormdrain, and water systems to depths up to 14 feet, no ground water was encountered. Therefore, no dewatering is anticipated. However, should dewatering become necessary, it should be pumped and dispersed to a well vegetated area within the project site. ELEMENT 11: Maintain BMPs A trained Certified Erosion and Sedimentation Control Lead (CESCL)will be on the job site. CESCL personnel are trained in and responsible for the proper maintenance of the erosion control BMPs. The CESCL will work with the City of Anacortes Inspector to maintain all BMPs. ELEMENT 12: Manage the Project A trained Certified Erosion and Sedimentation Control Lead (CESCL) will be on the job site. CESCL personnel are trained in and responsible for the proper maintenance of the erosion control BMPs. The CESCL will work with the City of Anacortes Inspector to maintain all BMPs. ELEMENT 13: Protect Low Impact Development BMPs No low impact development BMPs are planned or required for this individual lot. EXHIBIT°°O° 1506 LATITUDE C O RM LOOT 11,PLAT OF 48 NORM HMSO PRIMARY BMPs damage from burying and smothering. Vegetative buffer zones for streams, lakes or other waterways shall be established by the local permitting authority or other state or federal permits or approvals. Maintenance Standards Inspect the area frequently to make sure flagging remains in place and the area remains undisturbed. Replace all damaged flagging immediately. UMP C103: 1Hi .h Visibility Fence Purpose Fencing is intended to: 1. Restrict clearing to approved limits. 2. Prevent disturbance of sensitive areas, their buffers, and other areas required to be left undisturbed. 3. Limit construction traffic to designated construction entrances, exits, or internal roads. 4. Protect areas where marking with survey tape may not provide adequate pro- tection. Conditions of Use To establish clearing limits plastic, fabric, or metal fence may be used: • At the boundary of sensitive areas, their buffers, and other areas required to be left uncleared. • As necessary to control vehicle access to and on the site. Design and Installation Specifications High visibility plastic fence shall be composed of a high-density polyethylene material and shall be at least four feet in height. Posts for the fencing shall be steel or wood and placed every 6 feet on center(maximum) or as needed to ensure rigidity. The fencing shall be fastened to the post every six inches with a polyethylene tie. On long continuous lengths of fencing, a tension wire or rope shall be used as a top stringer to prevent sag- ging between posts. The fence color shall be high visibility orange. The fence tensile strength shall be 360 lbs./ft. using the ASTM D4595 testing method. If appropriate install fabric silt fence in accordance with BMP C233: Silt Fence (p.367) to act as high visibility fence. Silt fence shall be at least 3 feet high and must be highly vis- ible to meet the requirements of this BMP. 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4 -Page 269 Metal fences shall be designed and installed according to the manufacturer's spe- cifications. Metal fences shall be at least 3 feet high and must be highly visible. Fences shall not be wired or stapled to trees. Main naoce Stondarrds If the fence has been damaged or visibility reduced, it shall be repaired or replaced immediately and visibility restored. Pi:P z ` 05® atelbal ed 4.;ons • ai s r ©e / Enit Stabilized Construction entrances are established to reduce the amount of sediment transported onto paved roads by vehicles or equipment. This is done by constructing a stabilized pad of quarry spalls at entrances and exits for construction sites. Conditions of Use Construction entrances shall be stabilized wherever traffic will be entering or leaving a construction site if paved roads or other paved areas are within 1,000 feet of the site. For residential construction provide stabilized construction entrances for each residence, rather than only at the main subdivision entrance. Stabilized surfaces shall be of suf- ficient length/width to provide vehicle access/parking, based on lot size/configuration. On large commercial, highway, and road projects, the designer should include enough extra materials in the contract to allow for additional stabilized entrances not shown in the initial Construction SWPPP. It is difficult to determine exactly where access to these projects will take place; additional materials will enable the contractor to install them where needed. Design an. Instollstion Specifications See Figure II-4.1.1 Stabilized Construction Entrance (p.273) for details. Note: the 100' minimum length of the entrance shall be reduced to the maximum practicable size when the size or configuration of the site does not allow the full length (100'). Construct stabilized construction entrances with a 12-inch thick pad of 4-inch to 8-inch quarry spalls, a 4-inch course of asphalt treated base (ATB), or use existing pavement. Do not use crushed concrete, cement, or calcium chloride for construction entrance sta- bilization because these products raise pH levels in stormwater and concrete discharge to surface waters of the State is prohibited. 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4 -Page 270 A separation geotextile shall be placed under the spalls to prevent fine sediment from pumping up into the rock pad. The geotextile shall meet the following standards: Grab Tensile Strength (ASTM D4751) 200 psi min. Grab Tensile Elongation (ASTM D4632) 30% max. Mullen Burst Strength (ASTM D3786-80a)400 psi min. AOS (ASTM D4751) 20-45 (U.S. standard sieve size) . Consider early installation of the first lift of asphalt in areas that will paved; this can be used as a stabilized entrance. Also consider the installation of excess concrete as a stabilized entrance. During large concrete pours, excess concrete is often available for this purpose. . Fencing (see BMP C103: High Visibility Fence (p.269)) shall be installed as neces- sary to restrict traffic to the construction entrance. . Whenever possible, the entrance shall be constructed on a firm, compacted sub- grade. This can substantially increase the effectiveness of the pad and reduce the need for maintenance. . Construction entrances should avoid crossing existing sidewalks and back of walk drains if at all possible. If a construction entrance must cross a sidewalk or back of walk drain, the full length of the sidewalk and back of walk drain must be covered and protected from sediment leaving the site. Maintenance Standards Quarry spalls shall be added if the pad is no longer in accordance with the spe- cifications. . If the entrance is not preventing sediment from being tracked onto pavement, then alternative measures to keep the streets free of sediment shall be used. This may include replacement/cleaning of the existing quarry spalls, street sweeping, an increase in the dimensions of the entrance, or the installation of a wheel wash. . Any sediment that is tracked onto pavement shall be removed by shoveling or street sweeping. The sediment collected by sweeping shall be removed or sta- bilized on site. The pavement shall not be cleaned by washing down the street, except when high efficiency sweeping is ineffective and there is a threat to public safety. If it is necessary to wash the streets, the construction of a small sump to con- tain the wash water shall be considered. The sediment would then be washed into the sump where it can be controlled. . Perform street sweeping by hand or with a high efficiency sweeper. Do not use a non-high efficiency mechanical sweeper because this creates dust and throws soils into storm systems or conveyance ditches. 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4 -Page 271 . Any quarry spalls that are loosened from the pad, which end up on the roadway shall be removed immediately. . If vehicles are entering or exiting the site at points other than the construction entrance(s), fencing (see BMP C103) shall be installed to control traffic. . Upon project completion and site stabilization, all construction accesses intended as permanent access for maintenance shall be permanently stabilized. 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4-Page 272 Figure 11-4.1.1 Stabilized Construction Entrance NOT TO SCALE oa ti�ng R •X -• 00 mac:r / II�I.I�I�t/�► / I • _I 100'min. I I I I I' • Install driveway �, culvert if there is a ��s;r�i!—�•Y",'Ae .... roadside ditch present 4"-8"quarry spalls Geotextile ti!� j. � e'�'; `Le �• I I I I I. Notes: 15'min. 1. Driveway shall meet 12"minimum thickness the requirements of the permitting agency. 2. It is recommended that Provide full width the entrance be of ingress/egress crowned so that runoff area drains off the pad. \ACM Figure 11-4.1 .1 Stabilized Construction Entrance DEPARTMENT OF Revised June 2015 ECOLOGY Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions, State of Washington limitation of liability,and disclaimer. 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4 -Page 273 BFMs and MBFMs provide good alternatives to blankets in most areas requir- ing vegetation establishment. Advantages over blankets include: • BFM and MBFMs do not require surface preparation. • Helicopters can assist in installing BFM and MBFMs in remote areas. • On slopes steeper than 2.5H:1 V, blanket installers may require ropes and harnesses for safety. • Installing BFM and MBFMs can save at least$1,000 per acre com- pared to blankets. Maintenance Standards Reseed any seeded areas that fail to establish at least 80 percent cover(100 percent cover for areas that receive sheet or concentrated flows). If reseeding is ineffective, use an alternate method such as sodding, mulching, or nets/blankets. If winter weather pre- vents adequate grass growth, this time limit may be relaxed at the discretion of the local authority when sensitive areas would otherwise be protected. Reseed and protect by mulch any areas that experience erosion after achieving adequate cover. Reseed and protect by mulch any eroded area. Supply seeded areas with adequate moisture, but do not water to the extent that it causes runoff. Approved as Equivalent Ecology has approved products as able to meet the requirements of BMP C120: Tem- porary and Permanent Seeding. The products did not pass through the Technology Assessment Protocol— Ecology (TAPE) process. Local jurisdictions may choose not to accept this product approved as equivalent, or may require additional testing prior to con- sideration for local use. The products are available for review on Ecology's website at http://www.ecy.wa.gov/programs/wq/stormwater/newtech/equivalent.html. BMP C121: Mulching Purpose Mulching soils provides immediate temporary protection from erosion. Mulch also enhances plant establishment by conserving moisture, holding fertilizer, seed, and top- soil in place, and moderating soil temperatures. There is an enormous variety of mulches that can be used. This section discusses only the most common types of mulch. Conditions of Use As a temporary cover measure, mulch should be used: 2014 Stormwater Management Manual for Western Washington Volume ll- Chapter 4 -Page 284 . For less than 30 days on disturbed areas that require cover. • At all times for seeded areas, especially during the wet season and during the hot summer months. . During the wet season on slopes steeper than 3H:1V with more than 10 feet of ver- tical relief. Mulch may be applied at any time of the year and must be refreshed periodically. . For seeded areas mulch may be made up of 100 percent: cottonseed meal; fibers made of wood, recycled cellulose, hemp, kenaf; compost; or blends of these. Tack- ifier shall be plant-based, such as guar or alpha plantago, or chemical-based such as polyacrylamide or polymers. Any mulch or tackifier product used shall be installed per manufacturer's instructions. Generally, mulches come in 40-50 pound bags. Seed and fertilizer are added at time of application. Design and Installation Specifications For mulch materials, application rates, and specifications, see Table II-4.1.8 Mulch Standards and Guidelines (p.286).Always use a 2-inch minimum mulch thickness; increase the thickness until the ground is 95% covered (i.e. not visible under the mulch layer). Note: Thickness may be increased for disturbed areas in or near sensitive areas or other areas highly susceptible to erosion. Where the option of"Compost" is selected, it should be a coarse compost that meets the following size gradations when tested in accordance with the U.S. Composting Council "Test Methods for the Examination of Compost and Composting" (TMECC) Test Method 02.02-B. Coarse Compost Minimum Percent passing 3"sieve openings 100% Minimum Percent passing 1"sieve openings 90% Minimum Percent passing 3/4"sieve openings 70% Minimum Percent passing 1/4"sieve openings 40% Mulch used within the ordinary high-water mark of surface waters should be selected to minimize potential flotation of organic matter. Composted organic materials have higher specific gravities (densities) than straw, wood, or chipped material. Consult Hydraulic Permit Authority (HPA) for mulch mixes if applicable. Maintenance Standards . The thickness of the cover must be maintained. . Any areas that experience erosion shall be remulched and/or protected with a net 2014 Stormwater Management Manual for Western Washington Volume 11- Chapter 4 -Page 285 or blanket. If the erosion problem is drainage related, then the problem shall be fixed and the eroded area remulched. Table 11-4.1.8 Mulch Standards and Guidelines Mulch Quality Application Material Standards Rates Remarks Cost-effective protection when applied with adequate thickness. Hand-application generally requires greater thickness than blown straw. The thickness of straw may be reduced by half when used in conjunction with seeding. In windy areas Air-dried; 2"-3" thick; straw must be held in place by crimping, using a free from 5 per tackifier, or covering with netting. Blown straw Straw undesirable 1 bales sf p always has to be held in place with a tackifier as or seed and 2�3 tons per even light winds will blow it away. Straw, how- coarse ever, has several deficiencies that should be con- material. acre sidered when selecting mulch materials. It often introduces and/or encourages the propagation of weed species and it has no significant long-term benefits It should also not be used within the ordinary high-water elevation of surface waters (due to flotation). Approx. 25- Shall be applied with hydromuicher. Shall not be No growth 30 lbs per used without seed and tackifier unless the applic- Hydromulch inhibiting 1,000 sf or ation rate is at least doubled. Fibers longer than factors. 1,500 - about 3/4 - 1 inch clog hydromulch equipment. 2,000 lbs Fibers should be kept to less than 3/4 inch. per acre No visible water or More effective control can be obtained by increas- dust during ing thickness to 3". Excellent mulch for protecting handling. 2" thick final grades until landscaping because it can be Must be pro-min.; directly seeded or tilled into soil as an amend- duced per approx. 100 ment. Compost used for mulch has a coarser size Compost WAC 173- tons per gradation than compost used for BMP C 125: Top- 350, Solid acre soiling /Composting (p.297) or BMP T5.13: Post- Waste (approx. Construction Soil Quality and Depth (p.911). It is Handling 800 lbs per more stable and practical to use in wet areas and Standards, yard) during rainy weather conditions. Do not use near but may wetlands or near phosphorous impaired water have up to bodies. 35% 2014 Stormwater Management Manual for Western Washington Volume 11- Chapter 4 -Page 286 Table 11-4.1.8 Mulch Standards and Guidelines (continued) Mulch Quality Application Material Standards Rates Remarks biosolids. Average size shall This is a cost-effective way to dispose of debris be several from clearing and grubbing, and it eliminates the inches. problems associated with burning. Generally, it Chipped Gradations should not be used on slopes above approx. 10% Site Veget- from fines 2" thick because of its tendency to be transported by run- ation to 6 inches min.; off. It is not recommended within 200 feet of sur- in length for face waters. If seeding is expected shortly after texture, vari- mulch, the decomposition of the chipped veget- ation, and ation may tie up nutrients important to grass estab- interlocking lishment. properties. No visible water or dust during handling. This material is often called "hog or hogged fuel". Must be pur-2" thick The use of mulch ultimately improves the organic Wood- chased min.; matter in the soil. Special caution is advised based from a sup- approx. 100 regarding the source and composition of wood- Mulch or plier with a tons per based mulches. Its preparation typically does not Solid acre Wood Waste (approx. provide any weed seed control, so evidence of Straw Handling 800 lbs. per residual vegetation in its composition or known Permit or cubic yard) inclusion of weed plants or seeds should be mon- one exempt itored and prevented (or minimized). from solid waste reg- ulations. A blend of Cost-effective protection when applied with loose, long, adequate thickness. A minimum of 95-percent of thin wood the wood strand shall have lengths between 2 Wood pieces and 10-inches, with a width and thickness Strand derived 2" thick min. between 1/16 and 3/8-inches. The mulch shall not Mulch from native contain resin, tannin, or other compounds in conifer or quantities that would be detrimental to plant life. deciduous Sawdust or wood shavings shall not be used as trees with mulch. (WSDOT specification (9-14.4(4)) 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4 -Page 287 Table 1I-4.1.8 Mulch Standards and Guidelines (continued) Mulch Quality Application Material Standards Rates Remarks high length- to-width ratio. BMP C122: Nets and Blankets Purpose Erosion control nets and blankets are intended to prevent erosion and hold seed and mulch in place on steep slopes and in channels so that vegetation can become well established. In addition, some nets and blankets can be used to permanently reinforce turf to protect drainage ways during high flows. Nets (commonly called matting) are strands of material woven into an open, but high-tensile strength net(for example, coconut fiber matting). Blankets are strands of material that are not tightly woven, but instead form a layer of interlocking fibers, typically held together by a biodegradable or photodegradable netting (for example, excelsior or straw blankets). They generally have lower tensile strength than nets, but cover the ground more completely. Coir (coconut fiber) fabric comes as both nets and blankets. Conditions of Use Erosion control nets and blankets should be used: . To aid permanent vegetated stabilization of slopes 2H:1 V or greater and with more than 10 feet of vertical relief. . For drainage ditches and swales (highly recommended). The application of appro- priate netting or blanket to drainage ditches and swales can protect bare soil from channelized runoff while vegetation is established. Nets and blankets also can cap- ture a great deal of sediment due to their open, porous structure. Nets and blankets can be used to permanently stabilize channels and may provide a cost-effective, environmentally preferable alternative to riprap. 100 percent synthetic blankets manufactured for use in ditches may be easily reused as temporary ditch liners. Disadvantages of blankets include: • Surface preparation required. . On slopes steeper than 2.5H:1V, blanket installers may need to be roped and har- nessed for safety. . They cost at least$4,000-6,000 per acre installed. Advantages of blankets include: 2014 Stormwater Management Manual for Western Washington Volume ll- Chapter 4 -Page 288 T<. Me 11-4o1 AS Mulch Standards and Guidelines (continued) Mulch Quality Application ateriial Standards Rates Remarks high length- to-width ratio. B!�`'P C122: Nets and Blankets Purpose Erosion control nets and blankets are intended to prevent erosion and hold seed and mulch in place on steep slopes and in channels so that vegetation can become well established. In addition, some nets and blankets can be used to permanently reinforce turf to protect drainage ways during high flows. Nets (commonly called matting) are strands of material woven into an open, but high-tensile strength net(for example, coconut fiber matting). Blankets are strands of material that are not tightly woven, but instead form a layer of interlocking fibers,typically held together by a biodegradable or photodegradable netting (for example, excelsior or straw blankets). They generally have lower tensile strength than nets, but cover the ground more completely. Coir(coconut fiber)fabric comes as both nets and blankets. Conditions of Use Erosion control nets and blankets should be used: • To aid permanent vegetated stabilization of slopes 2H:1V or greater and with more than 10 feet of vertical relief. • For drainage ditches and swales (highly recommended). The application of appro- priate netting or blanket to drainage ditches and swales can protect bare soil from channelized runoff while vegetation is established. Nets and blankets also can cap- ture a great deal of sediment due to their open, porous structure. Nets and blankets can be used to permanently stabilize channels and may provide a cost-effective, environmentally preferable alternative to riprap. 100 percent synthetic blankets manufactured for use in ditches may be easily reused as temporary ditch liners. Disadvantages of blankets include: • Surface preparation required. • On slopes steeper than 2.5H:1V, blanket installers may need to be roped and har- nessed for safety. • They cost at least$4,000-6,000 per acre installed. Advantages of blankets include: 2014 Stormwater Management Manual for Western Washington Volume 11- Chapter 4 -Page 288 • Installation without mobilizing special equipment. . Installation by anyone with minimal training . Installation in stages or phases as the project progresses. . Installers can hand place seed and fertilizer as they progress down the slope. • Installation in any weather. . There are numerous types of blankets that can be designed with various para- meters in mind. Those parameters include: fiber blend, mesh strength, longevity, biodegradability, cost, and availability. Design and Installation Specifications . See Figure II-4.1.3 Channel Installation (p.292) and Figure II-4.1.4 Slope Install- ation (p.293) for typical orientation and installation of blankets used in channels and as slope protection. Note: these are typical only; all blankets must be installed per manufacturer's installation instructions. . Installation is critical to the effectiveness of these products. If good ground contact is not achieved, runoff can concentrate under the product, resulting in significant erosion. . Installation of Blankets on Slopes: 1. Complete final grade and track walk up and down the slope. 2. Install hydromulch with seed and fertilizer. 3. Dig a small trench, approximately 12 inches wide by 6 inches deep along the top of the slope. 4. Install the leading edge of the blanket into the small trench and staple approx- imately every 18 inches. NOTE: Staples are metal, "U"-shaped, and a min- imum of 6 inches long. Longer staples are used in sandy soils. Biodegradable stakes are also available. 5. Roll the blanket slowly down the slope as installer walks backwards. NOTE: The blanket rests against the installer's legs. Staples are installed as the blanket is unrolled. It is critical that the proper staple pattern is used for the blanket being installed. The blanket is not to be allowed to roll down the slope on its own as this stretches the blanket making it impossible to main- tain soil contact. In addition, no one is allowed to walk on the blanket after it is in place. 6. If the blanket is not long enough to cover the entire slope length, the trailing edge of the upper blanket should overlap the leading edge of the lower 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4-Page 289 blanket and be stapled. On steeper slopes, this overlap should be installed in a small trench, stapled, and covered with soil. . With the variety of products available, it is impossible to cover all the details of appropriate use and installation. Therefore, it is critical that the design engineer consult the manufacturer's information and that a site visit takes place in order to ensure that the product specified is appropriate. Information is also available at the following web sites: 1. WSDOT (Section 3.2.4): http://www.wsdot.wa.gov/NR/rdonlyres/3B41 E087-FA86-4717-932D- D7A8556CC D57/0/ErosionTrainingManual.pdf 2. Texas Transportation Institute: http://www.txdot.gov/business/doing_business/product evaluation/erosion_ control.htm • Use jute matting in conjunction with mulch (BMP C121: Mulching (p.284)). Excel- sior, woven straw blankets and coir(coconut fiber) blankets may be installed without mulch. There are many other types of erosion control nets and blankets on the market that may be appropriate in certain circumstances. • In general, most nets (e.g.,jute matting) require mulch in order to prevent erosion because they have a fairly open structure. Blankets typically do not require mulch because they usually provide complete protection of the surface. . Extremely steep, unstable, wet, or rocky slopes are often appropriate candidates for use of synthetic blankets, as are riverbanks, beaches and other high-energy environments. If synthetic blankets are used, the soil should be hydromulched first. • 100-percent biodegradable blankets are available for use in sensitive areas. These organic blankets are usually held together with a paper or fiber mesh and stitching which may last up to a year. . Most netting used with blankets is photodegradable, meaning they break down under sunlight(not UV stabilized). However, this process can take months or years even under bright sun. Once vegetation is established, sunlight does not reach the mesh. It is not uncommon to find non-degraded netting still in place several years after installation. This can be a problem if maintenance requires the use of mowers or ditch cleaning equipment. In addition, birds and small animals can become trapped in the netting. Maintenance Standards . Maintain good contact with the ground. Erosion must not occur beneath the net or blanket. 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4 -Page 290 • Repair and staple any areas of the net or blanket that are damaged or not in close contact with the ground. • Fix and protect eroded areas if erosion occurs due to poorly controlled drainage. 2014 Stormwater Management Manual for Western Washington Volume Il- Chapter 4-Page 291 Figure 11-4.1.3 Channel Installation " I NOT TO SCALE Orr ... ,,,., yf,„,,,,:,, „ , r4 / / %''./4 / / \ \ LONGITUDINAL ANCHOR TRENCH TERMINAL SLOPE AND CHANNEL garr! ANCHOR TRENCH \4-4\4 1r NTERfiA T 3,-5'P \( r\r ., P r4• Ot4 , P !.,'11 r P / r -/ \.,\\/ \\ \ (r�1// CHECK SLOT AT 25"INTERVALS P P / //\\. ISOMETRIC VIEW /\/ i1tiIiI ! A .•Aup,„: r .. INITIAL CHANNEL ANCHOR TRENCH INTERMITTENT CHECK SLOT Source:Clackamas County 2009 Notes: Erosion Prevention Planning and 1. Check slots to be constructed per manufacturers specifications. Design Manual 2. Staking or stapling layout per manufacturers specifications. fti' '111 Figure 11-4.1 .3 Channel Installation DEPARTMENT OF Revised June 2015 ECOLOGY Please see http.•//www.ecy.wa.gov/copynght.html for copyright notice including permissions, State of Washington limitation of liability,and disclaimer. 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4 -Page 292 Pugnit JU- ,„ l A SQ© c flnsq atl1C rC7i Anchor in 6" x 6" min. trench and staple at 12" intervals 't v-'C • S v• Min. 2" overlap 1.„= trri =1 • 111=11=11-11:=1 — =11=I1.,r=11=11=11: ft -1 -- •ii 11=11= 1 11=11= ��...;;:<° ,-a•-•'%c r .411#.11:41'- Min. 6" overlap .T �1 .h:a Il 11=11 1;-t11,=11=111:117..11-17t1f 1-11 =11=11=11=.11 I1 II II II „ .111-11=i111=a=11--'--*--ti Staple overlaps �.11-1f-1Ljjii max. 5" spacing . .1-11-11-11-11-1I-H 11-11-11-11=1!-11..-m —ll--[l-11-11-11-11�Il—ll.- -1i-1!—K-11. 11.=11.=1= _ Bring material down to a level area, turn the end under 4" and staple at 12" intervals Notes: 1, Slope surface shall be smooth before placement for proper soil contact. 2. Stapling pattern as per manufacturer's recommendations. 3. Do not stretch blanketsfmattings tight- allow the rolls to mold to any irregularities. 4. For slopes less than 3H:1V, rolls may be placed in horizontal strips. 5. If there is a berm at the top of the slope, anchor upslope of the berm. 6. Lime, fertilize, and seed before installation. Planting of shrubs, trees, etc. should occur after installation. NOT TO SCALE 1111.►. Figure II n l 4 &Dope nstalDat on DEPARTMENT OF Revised June 2015 ECOLOGY Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions, State of Washington limitation of liability, and disclaimer. 2014 Stormwater Management Manual for Western Washington Volume 11 - Chapter 4 - Page 293 Design and Installation Specifications . Plastic slope cover must be installed as follows: 1. Run plastic up and down slope, not across slope. 2. Plastic may be installed perpendicular to a slope if the slope length is less than 10 feet. 3. Minimum of 8-inch overlap at seams. 4. On long or wide slopes, or slopes subject to wind, tape all seams. 5. Place plastic into a small (12-inch wide by 6-inch deep) slot trench at the top of the slope and backfill with soil to keep water from flowing underneath. 6. Place sand filled burlap or geotextile bags every 3 to 6 feet along seams and tie them together with twine to hold them in place. 7. Inspect plastic for rips, tears, and open seams regularly and repair imme- diately. This prevents high velocity runoff from contacting bare soil which causes extreme erosion. 8. Sandbags may be lowered into place tied to ropes. However, all sandbags must be staked in place. . Plastic sheeting shall have a minimum thickness of 0.06 millimeters. . If erosion at the toe of a slope is likely, a gravel berm, riprap, or other suitable pro- tection shall be installed at the toe of the slope in order to reduce the velocity of run- off. Maintenance Standards . Torn sheets must be replaced and open seams repaired. . Completely remove and replace the plastic if it begins to deteriorate due to ultra- violet radiation. . Completely remove plastic when no longer needed. . Dispose of old tires used to weight down plastic sheeting appropriately. Approved as Equivalent Ecology has approved products as able to meet the requirements of BMP C123: Plastic Covering.The products did not pass through the Technology Assessment Protocol — Ecology (TAPE) process. Local jurisdictions may choose not to accept this product approved as equivalent, or may require additional testing prior to consideration for local use. The products are available for review on Ecology's website at http://www.ecy.wa.gov/programs/wq/stormwater/newtech/eq uivalent.html 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4-Page 295 EIMP C124: Sodding Purpose The purpose of sodding is to establish permanent turf for immediate erosion protection and to stabilize drainage ways where concentrated overland flow will occur. Conditions of Use Sodding may be used in the following areas: . Disturbed areas that require short-term or long-term cover. . Disturbed areas that require immediate vegetative cover. . All waterways that require vegetative lining. Waterways may also be seeded rather than sodded, and protected with a net or blanket. Design and Installation Specifications Sod shall be free of weeds, of uniform thickness (approximately 1-inch thick), and shall have a dense root mat for mechanical strength. The following steps are recommended for sod installation: . Shape and smooth the surface to final grade in accordance with the approved grad- ing plan. The swale needs to be overexcavated 4 to 6 inches below design elev- ation to allow room for placing soil amendment and sod. . Amend 4 inches (minimum) of compost into the top 8 inches of the soil if the organic content of the soil is less than ten percent or the permeability is less than 0.6 inches per hour. See http://www.ecy.wa.gov/programs/swfa/organics/soil.html for further information. . Fertilize according to the supplier's recommendations. . Work lime and fertilizer 1 to 2 inches into the soil, and smooth the surface. . Lay strips of sod beginning at the lowest area to be sodded and perpendicular to the direction of water flow. Wedge strips securely into place. Square the ends of each strip to provide for a close, tight fit. Stagger joints at least 12 inches. Staple on slopes steeper than 3H:1 V. Staple the upstream edge of each sod strip. . Roll the sodded area and irrigate. . When sodding is carried out in alternating strips or other patterns, seed the areas between the sod immediately after sodding. 2014 Stormwater Management Manual for Western Washington Volume ll- Chapter 4 -Page 296 Maintenance Standards If the grass is unhealthy, the cause shall be determined and appropriate action taken to reestablish a healthy groundcover. If it is impossible to establish a healthy groundcover due to frequent saturation, instability, or some other cause, the sod shall be removed, the area seeded with an appropriate mix, and protected with a net or blanket. BMP C125: Topsoiling / Composting Purpose Topsoiling and composting provide a suitable growth medium for final site stabilization with vegetation. While not a permanent cover practice in itself, topsoiling and corn- posting are an integral component of providing permanent cover in those areas where there is an unsuitable soil surface for plant growth. Use this BMP in conjunction with other BMPs such as seeding, mulching, or sodding. Note that this BMP is functionally the same as BMP T5.13: Post-Construction Soil Quality and Depth (p.911)which is required for all disturbed areas that will be developed as lawn or landscaped areas at the completed project site. Native soils and disturbed soils that have been organically amended not only retain much more stormwater, but they also serve as effective biofilters for urban pollutants and, by supporting more vigorous plant growth, reduce the water, fertilizer and pesticides needed to support installed landscapes. Topsoil does not include any subsoils but only the material from the top several inches including organic debris. Conditions of Use . Permanent landscaped areas shall contain healthy topsoil that reduces the need for fertilizers, improves overall topsoil quality, provides for better vegetal health and vitality, improves hydrologic characteristics, and reduces the need for irrigation. . Leave native soils and the duff layer undisturbed to the maximum extent prac- ticable. Stripping of existing, properly functioning soil system and vegetation for the purpose of topsoiling during construction is not acceptable. Preserve existing soil systems in undisturbed and uncompacted conditions if functioning properly. . Areas that already have good topsoil, such as undisturbed areas, do not require soil amendments. . Restore, to the maximum extent practical, native soils disturbed during clearing and grading to a condition equal to or better than the original site condition's mois- ture-holding capacity. Use on-site native topsoil, incorporate amendments into on- site soil, or import blended topsoil to meet this requirement. . Topsoiling is a required procedure when establishing vegetation on shallow soils, and soils of critically low pH (high acid) levels. 2014 Stormwater Management Manual for Western Washington Volume 11- Chapter 4 -Page 297 . Beware of where the topsoil comes from, and what vegetation was on site before disturbance, invasive plant seeds may be included and could cause problems for establishing native plants, landscaped areas, or grasses. . Topsoil from the site will contain mycorrhizal bacteria that are necessary for healthy root growth and nutrient transfer. These native mycorrhiza are acclimated to the site and will provide optimum conditions for establishing grasses. Use com- mercially available mycorrhiza products when using off-site topsoil. Design and Installation Specifications Meet the following requirements for disturbed areas that will be developed as lawn or landscaped areas at the completed project site: . Maximize the depth of the topsoil wherever possible to provide the maximum pos- sible infiltration capacity and beneficial growth medium. Topsoil shall have: • A minimum depth of 8-inches. Scarify subsoils below the topsoil layer at least 4-inches with some incorporation of the upper material to avoid stratified lay- ers, where feasible. Ripping or re-structuring the subgrade may also provide additional benefits regarding the overall infiltration and interflow dynamics of the soil system. o A minimum organic content of 10% dry weight in planting beds, and 5% organic matter content in turf areas. Incorporate organic amendments to a minimum 8-inch depth except where tree roots or other natural features limit the depth of incorporation. o A pH between 6.0 and 8.0 or matching the pH of the undisturbed soil. • If blended topsoil is imported, then fines should be limited to 25 percent passing through a 200 sieve. • Mulch planting beds with 2 inches of organic material . Accomplish the required organic content, depth, and pH by returning native topsoil to the site, importing topsoil of sufficient organic content, and/or incorporating organic amendments. When using the option of incorporating amendments to meet the organic content requirement, use compost that meets the compost specification for Bioretention (See BMP T7.30: Bioretention Cells, Swales, and Planter Boxes (p.959)), with the exception that the compost may have up to 35% biosolids or manure. . Sections three through seven of the document entitled, Guidelines and Resources for Implementing Soil Quality and Depth BMP T5.13 in WDOE Stormwater Man- agement Manual for Western Washington, provides useful guidance for imple- menting whichever option is chosen. It includes guidance for pre-approved default strategies and guidance for custom strategies. Check with your local jurisdiction 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4 -Page 298 concerning its acceptance of this guidance. It is available through the organization, Soils for Salmon.As of this printing the document may be found at: http://www.soils- forsalmon.org/pdf/Soil BMP Manual.pdf. . The final composition and construction of the soil system will result in a natural selection or favoring of certain plant species over time. For example, incorporation of topsoil may favor grasses, while layering with mildly acidic, high-carbon amend- ments may favor more woody vegetation. . Allow sufficient time in scheduling for topsoil spreading prior to seeding, sodding, or planting. . Take care when applying top soil to subsoils with contrasting textures. Sandy top- soil over clayey subsoil is a particularly poor combination, as water creeps along the junction between the soil layers and causes the topsoil to slough. If topsoil and subsoil are not properly bonded, water will not infiltrate the soil profile evenly and it will be difficult to establish vegetation. The best method to prevent a lack of bond- ing is to actually work the topsoil into the layer below for a depth of at least 6 inches. . Field exploration of the site shall be made to determine if there is surface soil of suf- ficient quantity and quality to justify stripping. Topsoil shall be friable and loamy (loam, sandy loam, silt loam, sandy clay loam, and clay loam).Avoid areas of nat- ural ground water recharge. . Stripping shall be confined to the immediate construction area.A 4-inch to 6-inch stripping depth is common, but depth may vary depending on the particular soil. All surface runoff control structures shall be in place prior to stripping. . Do not place topsoil while in a frozen or muddy condition, when the subgrade is excessively wet, or when conditions exist that may otherwise be detrimental to proper grading or proposed sodding or seeding. . In any areas requiring grading remove and stockpile the duff layer and topsoil on site in a designated, controlled area, not adjacent to public resources and critical areas. Stockpiled topsoil is to be reapplied to other portions of the site where feas- ible. . Locate the topsoil stockpile so that it meets specifications and does not interfere with work on the site. It may be possible to locate more than one pile in proximity to areas where topsoil will be used. Stockpiling of topsoil shall occur in the following manner: . Side slopes of the stockpile shall not exceed 2H:1V. . Between October 1 and April 30: 2014 Stomiwater Management Manual for Western Washington Volume II- Chapter 4 -Page 299 . An interceptor dike with gravel outlet and silt fence shall surround all topsoil. . Within 2 days complete erosion control seeding, or covering stockpiles with clear plastic, or other mulching materials. . Between May 1 and September 30: . An interceptor dike with gravel outlet and silt fence shall surround all topsoil if the stockpile will remain in place for a longer period of time than active construction grading. . Within 7 days complete erosion control seeding, or covering stockpiles with clear plastic, or other mulching materials. . When native topsoil is to be stockpiled and reused the following should apply to ensure that the mycorrhizal bacterial, earthworms, and other beneficial organisms will not be destroyed: 1. Re-install topsoil within 4 to 6 weeks. 2. Do not allow the saturation of topsoil with water. 3. Do not use plastic covering. Maintenance Standards . Inspect stockpiles regularly, especially after large storm events. Stabilize any areas that have eroded. . Establish soil quality and depth toward the end of construction and once estab- lished, protect from compaction, such as from large machinery use, and from erosion. . Plant and mulch soil after installation. . Leave plant debris or its equivalent on the soil surface to replenish organic matter. . Reduce and adjust, where possible, the use of irrigation, fertilizers, herbicides and pesticides, rather than continuing to implement formerly established practices. BMP C126: Polyacrylamide (PAM) for Soil Erosion Protection Purpose Polyacrylamide (PAM) is used on construction sites to prevent soil erosion. Applying PAM to bare soil in advance of a rain event significantly reduces erosion and controls sediment in two ways. First, PAM increases the soil's available pore volume, 2014 Stormwater Management Manual for Western Washington Volume ll- Chapter 4 -Page 300 MP C140: Dust Control Purpose Dust control prevents wind transport of dust from disturbed soil surfaces onto roadways, drainage ways, and surface waters. Conditions of Use • In areas (including roadways) subject to surface and air movement of dust where on-site and off-site impacts to roadways, drainage ways, or surface waters are likely. Design and Installation Specifications • Vegetate or mulch areas that will not receive vehicle traffic. In areas where plant- ing, mulching, or paving is impractical, apply gravel or landscaping rock. • Limit dust generation by clearing only those areas where immediate activity will take place, leaving the remaining area(s) in the original condition. Maintain the ori- ginal ground cover as long as practical. • Construct natural or artificial windbreaks or windscreens. These may be designed as enclosures for small dust sources. • Sprinkle the site with water until surface is wet. Repeat as needed. To prevent carryout of mud onto street, refer to BMP C 105: Stabilized Construction Entrance / Exit(p.270). • Irrigation water can be used for dust control. Irrigation systems should be installed as a first step on sites where dust control is a concern. • Spray exposed soil areas with a dust palliative, following the manufacturer's instructions and cautions regarding handling and application. Used oil is pro- hibited from use as a dust suppressant. Local governments may approve other dust palliatives such as calcium chloride or PAM. • PAM (BMP C126: Polyacrylamide (PAM) for Soil Erosion Protection (p.300)) added to water at a rate of 0.5 lbs. per 1,000 gallons of water per acre and applied from a water truck is more effective than water alone. This is due to increased infilt- ration of water into the soil and reduced evaporation. In addition, small soil particles are bonded together and are not as easily transported by wind.Adding PAM may actually reduce the quantity of water needed for dust control. Use of PAM could be a cost-effective dust control method. Techniques that can be used for unpaved roads and lots include: 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4 -Page 310 • Lower speed limits. High vehicle speed increases the amount of dust stirred up from unpaved roads and lots. . Upgrade the road surface strength by improving particle size, shape, and mineral types that make up the surface and base materials. • Add surface gravel to reduce the source of dust emission. Limit the amount of fine particles (those smaller than .075 mm)to 10 to 20 percent. . Use geotextile fabrics to increase the strength of new roads or roads undergoing reconstruction. • Encourage the use of alternate, paved routes, if available. • Restrict use of paved roadways by tracked vehicles and heavy trucks to prevent damage to road surface and base. . Apply chemical dust suppressants using the admix method, blending the product with the top few inches of surface material. Suppressants may also be applied as surface treatments. • Pave unpaved permanent roads and other trafficked areas. . Use vacuum street sweepers. . Remove mud and other dirt promptly so it does not dry and then turn into dust. • Limit dust-causing work on windy days. . Contact your local Air Pollution Control Authority for guidance and training on other dust control measures. Compliance with the local Air Pollution Control Authority constitutes compliance with this BMP. Maintenance Standards Respray area as necessary to keep dust to a minimum. BMP C150: Materials on Hand Purpose Keep quantities of erosion prevention and sediment control materials on the project site at all times to be used for regular maintenance and emergency situations such as unex- pected heavy summer rains. Having these materials on-site reduces the time needed to implement BMPs when inspections indicate that existing BMPs are not meeting the Con- struction SWPPP requirements. In addition, contractors can save money by buying some materials in bulk and storing them at their office or yard. 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4- Page 311 BMP C207: Check Dams Purpose Construction of small dams across a swale or ditch reduces the velocity of concentrated flow and dissipates energy at the check dam. Conditions of Use Where temporary channels or permanent channels are not yet vegetated, channel lining is infeasible, and/or velocity checks are required. • Check dams may not be placed in streams unless approved by the State Depart- ment of Fish and Wildlife. Check dams may not be placed in wetlands without approval from a permitting agency. • Do not place check dams below the expected backwater from any salmonid bear- ing water between October 1 and May 31 to ensure that there is no loss of high flow refuge habitat for overwintering juvenile salmonids and emergent salmonid fry. • Construct rock check dams from appropriately sized rock. The rock used must be large enough to stay in place given the expected design flow through the channel. The rock must be placed by hand or by mechanical means (no dumping of rock to form dam) to achieve complete coverage of the ditch or swale and to ensure that the center of the dam is lower than the edges. Check dams may also be constructed of either rock or pea-gravel filled bags. Numerous new products are also available for this purpose. They tend to be re- usable, quick and easy to install, effective, and cost efficient. • Place check dams perpendicular to the flow of water. ▪ The dam should form a triangle when viewed from the side. This prevents under- cutting as water flows over the face of the dam rather than falling directly onto the ditch bottom. • Before installing check dams impound and bypass upstream water flow away from the work area. Options for bypassing include pumps, siphons, or temporary chan- nels. • Check dams in association with sumps work more effectively at slowing flow and retaining sediment than just a check dam alone. A deep sump should be provided immediately upstream of the check dam. • In some cases, if carefully located and designed, check dams can remain as per- manent installations with very minor regrading. They may be left as either spill- ways, in which case accumulated sediment would be graded and seeded, or as 2014 Stormwater Management Manual for Western Washington Volume 11- Chapter 4 -Page 352 check dams to prevent further sediment from leaving the site. . The maximum spacing between the dams shall be such that the toe of the upstream dam is at the same elevation as the top of the downstream dam. . Keep the maximum height at 2 feet at the center of the dam. . Keep the center of the check dam at least 12 inches lower than the outer edges at natural ground elevation. . Keep the side slopes of the check dam at 2H:1V or flatter. . Key the stone into the ditch banks and extend it beyond the abutments a minimum of 18 inches to avoid washouts from overflow around the dam. . Use filter fabric foundation under a rock or sand bag check dam. If a blanket ditch liner is used, filter fabric is not necessary.A piece of organic or synthetic blanket cut to fit will also work for this purpose. . In the case of grass-lined ditches and swales, all check dams and accumulated sediment shall be removed when the grass has matured sufficiently to protect the ditch or swale - unless the slope of the swale is greater than 4 percent. The area beneath the check dams shall be seeded and mulched immediately after dam removal. . Ensure that channel appurtenances, such as culvert entrances below check dams, are not subject to damage or blockage from displaced stones. Figure 11-4.2.7 Rock Check Dam (p.354) depicts a typical rock check dam. Maintenance Standards Check dams shall be monitored for performance and sediment accumulation during and after each runoff producing rainfall. Sediment shall be removed when it reaches one half the sump depth. . Anticipate submergence and deposition above the check dam and erosion from high flows around the edges of the dam. . If significant erosion occurs between dams, install a protective riprap liner in that portion of the channel. Approved as Equivalent Ecology has approved products as able to meet the requirements of BMP C207: Check Dams. The products did not pass through the Technology Assessment Protocol— Eco- logy (TAPE) process. Local jurisdictions may choose not to accept this product approved as equivalent, or may require additional testing prior to consideration for local use. The products are available for review on Ecology's website at http://www.ecy.wa.gov- /programs/wq/stormwater/newtech/equivalent.html 2014 Stormwater Management Manual for Western Washington Volume 11- Chapter 4-Page 353 Figure 11-4.2.7 Rock Check Dam View Looking Upstream q 18" 12" (0.5m) • (150mm) \ ./} .o40 pv7:5 •a • ,./4,724"(0.6m) Note: Key stone into channel banks and extend it beyond the abutments a minimum of 18" (0.5m)to prevent flow around dam. A Section A-A • k 8'(2.4m) Spacing Between Check Dams 'L'=the distance such that points 'A'and'B'are of equal elevation. • Point'A' Point'B' •o \/i\//\/// NOT TO SCALE Figure 11-4.2.7 Rock Check Dam DEPARTMENT OF Revised July 2015 ECOLOGY Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions, State of Washington limitation of liability,and disclaimer. 2014 Stormwater Management Manual for Western Washington Volume ll- Chapter 4-Page 354 1. If the discharge velocity at the outlet is less than 5 fps (pipe slope less than 1 percent), use 2-inch to 8-inch riprap. Minimum thickness is 1-foot. 2. For 5 to 10 fps discharge velocity at the outlet(pipe slope less than 3 per- cent), use 24-inch to 48-inch riprap. Minimum thickness is 2 feet. 3. For outlets at the base of steep slope pipes (pipe slope greater than 10 per- cent), an engineered energy dissipater shall be used. a Filter fabric or erosion control blankets should always be used under riprap to pre- vent scour and channel erosion. New pipe outfalls can provide an opportunity for low-cost fish habitat improve- ments. For example, an alcove of low-velocity water can be created by con- structing the pipe outfall and associated energy dissipater back from the stream edge and digging a channel, over-widened to the upstream side, from the outfall. Overwintering juvenile and migrating adult salmonids may use the alcove as shel- ter during high flows. Bank stabilization, bioengineering, and habitat features may be required for disturbed areas. This work may require a HPA. See Volume V (p.765) for more information on outfall system design. Maintenance Standards • Inspect and repair as needed. o Add rock as needed to maintain the intended function. • Clean energy dissipater if sediment builds up. BMA' C220: Storm Drain Inlet Protection Purpose Storm drain inlet protection prevents coarse sediment from entering drainage systems prior to permanent stabilization of the disturbed area. Conditions of Use Use storm drain inlet protection at inlets that are operational before permanent sta- bilization of the disturbed drainage area. Provide protection for all storm drain inlets downslope and within 500 feet of a disturbed or construction area, unless conveying run- off entering catch basins to a sediment pond or trap. Also consider inlet protection for lawn and yard drains on new home construction. These small and numerous drains coupled with lack of gutters in new home construction can add significant amounts of sediment into the roof drain system. If possible delay installing lawn and yard drains until just before landscaping or cap these drains to pre- 2014 Stormwater Management Manual for Western Washington Volume 11- Chapter 4-Page 357 vent sediment from entering the system until completion of landscaping. Provide 18- inches of sod around each finished lawn and yard drain. Table 11-4.2.2 Storm Drain Inlet Protection (p.358) lists several options for inlet protection. All of the methods for storm drain inlet protection tend to plug and require a high fre- quency of maintenance. Limit drainage areas to one acre or less. Possibly provide emer- gency overflows with additional end-of-pipe treatment where stormwater ponding would cause a hazard. Table 11-4.2.2 Storm Drain Inlet Protection Type of Inlet Emergency Applicable for Protection Overflow Paved/Earthen Conditions of Use Surfaces Drop Inlet Protection Excavated drop Yes, tern- Applicable for heavy flows. Easy inlet protection porary flood- Earthen to maintain. Large area Require- ing will occur ment: 301x30'/acre Block and gravel drop inlet Yes Paved or Earthen Applicable for heavy concentrated flows. ill not pond. protection Gravel and wire Applicable for heavy concentrated drop inlet pro- No flows. Will pond. Can withstand tection traffic. Catch basin fil- Yes Paved or Earthen Frequent Maintenance required. ters Curb Inlet Protection Curb inlet pro- Small capacity Used for sturdy, more compact tection with overflow Paved installation. wooden weir Block and gravel curb inlet Yes Paved Sturdy, but limited filtration. protection Culvert Inlet Protection Culvert inlet Sed• 18 month expected life. iment trap Design and Installation Specifications Excavated Drop Inlet Protection-An excavated impoundment around the storm drain. Sediment settles out of the stormwater prior to entering the storm drain. 2014 Stormwater Management Manual for Western Washington Volume II- Chapter 4 -Page 358 . Provide a depth of 1-2 ft as measured from the crest of the inlet structure. . Slope sides of excavation no steeper than 2H:1 V. . Minimum volume of excavation 35 cubic yards. . Shape basin to fit site with longest dimension oriented toward the longest inflow area. . Install provisions for draining to prevent standing water problems. . Clear the area of all debris. . Grade the approach to the inlet uniformly. . Drill weep holes into the side of the inlet. . Protect weep holes with screen wire and washed aggregate. . Seal weep holes when removing structure and stabilizing area. . Build a temporary dike, if necessary, to the down slope side of the structure to pre- vent bypass flow. Block and Gravel Filter-A barrier formed around the storm drain inlet with standard con- crete blocks and gravel. See Figure II-4.2.8 Block and Gravel Filter(p.360). . Provide a height of 1 to 2 feet above inlet. . Recess the first row 2-inches into the ground for stability. . Support subsequent courses by placing a 2x4 through the block opening. . Do not use mortar. . Lay some blocks in the bottom row on their side for dewatering the pool. . Place hardware cloth or comparable wire mesh with '/-inch openings over all block openings. . Place gravel just below the top of blocks on slopes of 2H:1V or flatter. . An alternative design is a gravel donut. . Provide an inlet slope of 3H:1 V. . Provide an outlet slope of 2H:1 V. . Provide a1-foot wide level stone area between the structure and the inlet. . Use inlet slope stones 3 inches in diameter or larger. . Use gravel '/z-to 3/-inch at a minimum thickness of 1-foot for the outlet slope. 2014 Stormwater Management Manual for Western Washington Volume ll- Chapter 4-Page 359 Figure 114 .2 .8 Block and Gravel Filter A Drain grate � o� O � I V . c� o Ll °cU°Q fop.°. OcUn . tlrq�'> d° CS c •O a cO `io d� ( a 4 g Concrete block �o0 b ° Gravel backfill a ° a a o a oa�0 �D , ZOO 6 n (�•. a � goo�'o �y5 y�oQ A Plan View Concrete block Wire screen or filter fabric Gravel backfill Overflow water 6 Ponding height _ �7r- g4^ Water orb orr r Drop inlet \\ \ \ %\// Section A-A Notes: 1 . Drop inlet sediment barriers are to be used for small , nearly level drainage areas. (less than 5%) 2 . Excavate a basin of sufficient size adjacent to the drop inlet. 3. The top of the structure (ponding height) must be well below the ground elevation downslope to prevent runoff from bypassing the inlet. A temporary dike may be necessary on the downslope side of the structure. NOT TO SCALE Figure 114 . 2 . 8 Block and Gravel Filter DEPARTMENT OF Revised August2015 ECOLOGY Please see http://wwwecy. wa. gov/copyright. htmt for copyright notice including permissions, State of Washingtoni limitation of liability, and disclaimer. 2014 Stormwater Management Manual for Westem Washington Volume ll - Chapter 4 - Page 360 Gravel and Wire Mesh Filter - A gravel barrier placed over the top of the inlet. This struc- ture does not provide an overflow . . Use a hardware cloth or comparable wire mesh with Y2-inch openings . Use coarse aggregate . . Provide a height 1400t or more , 18-inches wider than inlet on all sides . Place wire mesh over the drop inlet so that the wire extends a minimum of 1400t beyond each side of the inlet structure . . Overlap the strips if more than one strip of mesh is necessary . Place coarse aggregate over the wire mesh . Provide at least a 12-inch depth of gravel over the entire inlet opening and extend at least 1 &inches on all sides . Catchbasin Filters — Use inserts designed by manufacturers for construction sites . The limited sediment storage capacity increases the amount of inspection and maintenance required , which may be daily for heavy sediment loads . To reduce maintenance require- ments combine a catchbasin filter with another type of inlet protection . This type of inlet protection provides flow bypass without overflow and therefore may be a better method for inlets located along active rights-of-way . . Provides 5 cubic feet of storage . . Requires dewatering provisions . . Provides a high -flow bypass that will not clog under normal use at a construction site . . Insert the catchbasin filter in the catchbasin just below the grating . Curb Inlet Protection with Wooden Weir — Barrier formed around a curb inlet with a wooden frame and gravel . . Use wire mesh with Y2Anch openings . . Use extra strength filter cloth . . Construct a frame . . Attach the wire and filter fabric to the frame . . Pile coarse washed aggregate against wire/fabric. . Place weight on frame anchors . Block and Gravel Curb Inlet Protection — Barrier formed around a curb inlet with concrete blocks and gravel . See Figure II4 . 2 . 9 Block and Gravel Curb Inlet Protection (p . 363 ) . 2014 Stormwater Management Manual for Westem Washington Volume ll - Chapter 4 - Page 361 . Use wire mesh with Y2rinch openings . . Place two concrete blocks on their sides abutting the curb at either side of the inlet opening . These are spacer blocks . . Place a 2x4 stud through the outer holes of each spacer block to align the front blocks . . Place blocks on their sides across the front of the inlet and abutting the spacer blocks . . Place wire mesh over the outside vertical face . . Pile coarse aggregate against the wire to the top of the barrier. Curb and Gutter Sediment Barrier - Sandbag or rock berm (riprap and aggregate) 3 feet high and 3 feet wide in a horseshoe shape . See Figure II4 . 2 . 10 Curb and Gutter Barrier (p 364 ) . . Construct a horseshoe shaped berm , faced with coarse aggregate if using riprap , 3 feet high and 3 feet wide , at least 2 feet from the inlet. • Construct a horseshoe shaped sedimentation trap on the outside of the berm sized to sediment trap standards for protecting a culvert inlet. Maintenance Standards . Inspect catch basin filters frequently , especially after storm events . Clean and replace clogged inserts . For systems with clogged stone filters : pull away the stones from the inlet and clean or replace . An alternative approach would be to use the clogged stone as fill and put fresh stone around the inlet. . Do not wash sediment into storm drains while cleaning . Spread all excavated material evenly over the surrounding land area or stockpile and stabilize as appro- priate . Approved as Equivalent Ecology has approved products as able to meet the requirements of BMP C220 : Storm Drain Inlet Protection . The products did not pass through the Technology Assessment Protocol — Ecology (TAPE ) process . Local jurisdictions may choose not to accept this product approved as equivalent, or may require additional testing prior to consideration for local use . The products are available for review on Ecology' s website at http ://www . ecy .wa .gov/programs/wq/Stormwater/newtech/eq uivalent. htmi 2014 Stonnwater Management Manual for Westem Washington Volume Il - Chapter 4 - Page 362 Figure 11 -4 .2 .9 Block and Gravel Curb Inlet Protection A Back of sidewalk Catch basin //2x4 Wood stud Back of curb Curb inlet Concrete block ° Wire screen or filter fabric o° inch (20 mm) A Concrete block Drain gravel Plan View Ponding height %a inch (20 mm) Drain gravel Overflow \� ' ' • •'�' == •• Curb inlet Wire screen or filter fabric 2x4 Wood stud (100x50 Timber stud) , Catch basin Concrete block Section AA Notes: 1 . Use block and gravel type sediment barrier when curb inlet is located in gently sloping street segment, where water can pond and allow sediment to separate from runoff. 2. Barrier shall allow for overflow from severe storm event. 3. Inspect barriers and remove sediment after each storm event. Sediment and gravel must be removed from the traveled way immediately. NOT TO SCALE Figure II -4 . 2 . 9 9 Block and Gravel Curb Inlet Protection DEPARTMENT OF Revised August 2015 ECOLOGY Please see http:lAvww. ecy. wa. gov/copyrighthtml for copyright notice including permissions, Stale of Washington limitation of liability, and disclaimer. 2014 Stormwater Management Manual for Westem Washington Volume 11 - Chapter 4 - Page 363 Figure 11 -4 .2 . 10 Curb and Gutter Barrier Back of sidewalk Burlap sacks to overlap onto curb Back of curb Runoff Curb inlet Runoff Spillway i Catch basin Plan View Gravel filled sandbags stacked tightly Notes: 1 . Place curb type sediment barriers on gently sloping street segments , where water can pond and allow sediment to separate from runoff. 2 . Sandbags of either burlap or woven 'geotextile' fabric, are filled with gravel , layered and packed tightly. 3. Leave a one sandbag gap in the top row to provide a spillway for overflow. 4. Inspect barriers and remove sediment after each storm event. Sediment and gravel must be removed from the traveled way immediately. NOT TO SCALE `w Figure II -4 . 2 . 10 Curb and Gutter Barrier DEPARTMENT OF Revised September 2015 ECOLOGY Please see http://www. ecy. wa. gov/copyrighkhtm/ for copyright notice including permissions, State of Washingtonj limitation of liability, and disclaimer. 2014 Stormwater Management Manual for Westem Washington Volume 11 - Chapter 4 - Page 364 P C232 : Graves Filter Berm Purpose A gravel filter berm is constructed on rights-ofway or traffic areas within a construction site to retain sediment by using a filter berm of gravel or crushed rock. Conditions of Use Where a temporary measure is needed to retain sediment from rights-of way or in traffic areas on construction sites . Design and Installation Specifications Berm material shall be 3/ to 3 inches in size , washed well -grade gravel or crushed rock with less than 5 percent fines . Spacing of berms : o Every 300 feet on slopes less than 5 percent o Every 200 feet on slopes between 5 percent and 10 percent o Every 100 feet on slopes greater than 10 percent ® Berm dimensions : o 1 foot high with 3H : 1V side slopes 8 linear feet per 1 cfs runoff based on the 10-year, 24-hour design storm Maintenance Standards ® Regular inspection is required . Sediment shall be removed and filter material replaced as needed . P C233 : Silt Fence Purpose Use of a silt fence reduces the transport of coarse sediment from a construction site by providing a temporary physical barrier to sediment and reducing the runoff velocities of overland flow . See Figure 11-4 . 2 . 12 Silt Fence (p . 369 ) for details on silt fence con struction . Conditions of Use Silt fence may be used downslope of all disturbed areas . 2014 Stormwater Management Manual for Western Washington Volume 11 - Chapter 4 - Page 367 BMP C232e Gravel Filter Berm Purpose A gravel filter berm is constructed on rights�ofi way or traffic areas within a construction site to retain sediment by using a filter berm of gravel or crushed rock . Conditions of Use Where a temporary measure is needed to retain sediment from rights-ofi way or in traffic areas on construction sites . Design and Installation Specifications a Berm material shall be % to 3 inches in size , washed well grade gravel or crushed rock with less than 5 percent fines . ® Spacing of berms : o Every 300 feet on slopes less than 5 percent o Every 200 feet on slopes between 5 percent and 10 percent o Every 100 feet on slopes greater than 10 percent ® Berm dimensions : o 1 foot high with 3H : 1V side slopes o 8 linear feet per 1 cfs runoff based on the 10�year, 24�hour design storm Maintenance Standards go Regular inspection is required . Sediment shall be removed and filter material replaced as needed . BMP C233 : Silt Fence Purpose Use of a silt fence reduces the transport of coarse sediment from a construction site by providing a temporary physical barrier to sediment and reducing the runoff velocities of overland flow . See Figure II-4 .2 . 12 Silt Fence (p . 369 ) for details on silt fence con - struction . Conditions of Use Silt fence may be used downslope of all disturbed areas . 2014 Stormwater Management Manual for Westem Washington Volume 11 e Chapter m Page 367 . Silt fence shall prevent soil carried by runoff water from going beneath , through , or over the top of the silt fence , but shall allow the water to pass through the fence . . Silt fence is not intended to treat concentrated flows , nor is it intended to treat sub- stantial amounts of overland flow . Convey any concentrated flows through the drainage system to a sediment pond . . Do not construct silt fences in streams or use in V-shaped ditches . Silt fences do not provide an adequate method of silt control for anything deeper than sheet or overland flow . 2014 Stormwater Management Manual for Western Washington Volume 11 - Chapter 4 - Page 368 Figure 11=4 . 2 . 12 Silt Fence Joints in filter fabric shall be spliced at posts. Use staples, wire rings or equivalent to attach fabric to posts 2"x2" by 14 Ga , wire or equivalent, if standard strength fabric used II Minimum I 6' max I j 4"x4" trench u Post spacing may be increased 2"x2" wood posts, steel to 8' if wire backing is used fence posts, or equivalent 2"x2" by 14 Ga . wire or equivalent, if standard strength fabric used \�\\ Filter fabric 2' min Backfill trench with native soil or %4^ 1 . 5" washed gravel \� 12" mm Minimum 4"x4" trench 2"x2 " wood posts, steel fence posts, or equivalent NOT TO SCALE Figure 114 . 2 . 12 Silt Fence DEPARTMENT OF Revised October 2014 ECOLOGY Please see http://www. ecy. wa. gov/copyright. html for copyright notice including permissions, State of Washington limitation of liability, and disclaimer. 2014 Stormwater Management Manual for Westem Washington Volume // - Chapter 4 - Page 369 Design and Installation Specifications Use in combination with sediment basins or other BMPs . . Maximum slope steepness (normal (perpendicular) to fence line) 1 H : 1 V. . Maximum sheet or overland flow path length to the fence of 100 feet. . Do not allow flows greater than 0 . 5 cfs . . The geotextile used shall meet the following standards . All geotextile properties lis- ted below are minimum average roll values ( i .e . , the test result for any sampled roll in a lot shall meet or exceed the values shown in Table II4 . 2 . 3 Geotextile Stand - ards (p . 370 )) : Table 114 .2 . 3 Geotextile Standards Polymeric Mesh AOS 0 . 60 mm maximum for slit film woven (#30 sieve) . 0 . 30 mm maxi (ASTM D4751 ) mum for all other geotextile types (#50 sieve) . 0 . 15 mm minimum for all fabric types (# 100 sieve) . Water Permittivity 0 . 02 sec- 1 minimum (ASTM D4491 ) Grab Tensile Strength 180 lbs . Minimum for extra strength fabric . (ASTM D4632 ) 100 Ibs minimum for standard strength fabric. Grab Tensile Strength 30 % maximum (ASTM D4632 ) Ultraviolet Resistance 70 % minimum (ASTM D4355) . Support standard strength fabrics with wire mesh , chicken wire , 24nch x 24nch wire , safety fence , orjute mesh to increase the strength of the fabric . Silt fence materials are available that have synthetic mesh backing attached . Filter fabric material shall contain ultraviolet ray inhibitors and stabilizers to provide a minimum of six months of expected usable construction life at a temperature range of 0 ° F . to 120 ° F . . One-hundred percent biodegradable silt fence is available that is strong , long last- ing , and can be left in place after the project is completed , if permitted by local reg - ulations . . Refer to Figure II4 . 2 . 12 Silt Fence (p . 369 ) for standard silt fence details . Include the following standard Notes for silt fence on construction plans and specifications : 2014 Stormwater Management Manual for Westem Washington Volume ll - Chapter - Page 370 1 . The contractor shall install and maintain temporary silt fences at the locations shown in the Plans . 2 . Construct silt fences in areas of clearing , grading , or drainage prior to starting those activities . 3 . The silt fence shall have a 2 -feet min . and a 2 %4eet max , height above the original ground surface . 4 . The filter fabric shall be sewn together at the point of manufacture to form fil - ter fabric lengths as required . Locate all sewn seams at support posts . Altern - atively , two sections of silt fence can be overlapped , provided the Contractor can demonstrate , to the satisfaction of the Engineer, that the overlap is long enough and that the adjacent fence sections are close enough together to prevent silt laden water from escaping through the fence at the overlap . 5 . Attach the filter fabric on the up-slope side of the posts and secure with staples , wire , or in accordance with the manufacturer's recommendations . Attach the filter fabric to the posts in a manner that reduces the potential for tearing . 6 . Support the filter fabric with wire or plastic mesh , dependent on the properties of the geotextile selected for use . If wire or plastic mesh is used , fasten the mesh securely to the up-slope side of the posts with the filter fabric up-slope of the mesh . 7 . Mesh support, if used , shall consist of steel wire with a maximum mesh spa- cing of 2-inches , or a prefabricated polymeric mesh . The strength of the wire or polymeric mesh shall be equivalent to or greater than 180 lbs . grab tensile strength . The polymeric mesh must be as resistant to the same level of ultra- violet radiation as the filter fabric it supports . 8 . Bury the bottom of the filter fabric 4-inches min , below the ground surface . Backfill and tamp soil in place over the buried portion of the filter fabric, so that no flow can pass beneath the fence and scouring cannot occur. When wire or polymeric back-up support mesh is used , the wire or polymeric mesh shall extend into the ground 3-inches min . 9 . Drive or place the fence posts into the ground 18-inches min . A 12—inch min . depth is allowed if topsoil or other soft subgrade soil is not present and 18- inches cannot be reached . Increase fence post min . depths by 6 inches if the fence is located on slopes of 3H : 1 V or steeper and the slope is perpendicular to the fence . If required post depths cannot be obtained , the posts shall be adequately secured by bracing or guying to prevent overturning of the fence due to sediment loading . 10 . Use wood , steel or equivalent posts . The spacing of the support posts shall 2014 Stormwater Management Manual for Westem Washington Volume 11 - Chapter 4 - Page 371 be a maximum of 6-feet. Posts shall consist of either: . Wood with dimensions of 2- inches by 2 -inches wide min . and a 34eet min . length . Wood posts shall be free of defects such as knots , splits , or gouges . . No . 6 steel rebar or larger. . ASTM A 120 steel pipe with a minimum diameter of 1 -inch . • U , T , L , or C shape steel posts with a minimum weight of 1 . 35 lbs ./ft. . Other steel posts having equivalent strength and bending resistance to the post sizes listed above . 11 . Locate silt fences on contour as much as possible , except at the ends of the fence , where the fence shall be turned uphill such that the silt fence captures the runoff water and prevents water from flowing around the end of the fence . 12 . If the fence must cross contours , with the exception of the ends of the fence , place gravel check dams perpendicular to the back of the fence to minimize concentrated flow and erosion . The slope of the fence line where contours must be crossed shall not be steeper than 3H : 1 V . . Gravel check dams shall be approximately 1400t deep at the back of the fence . Gravel check dams shall be continued perpendicular to the fence at the same elevation until the top of the check dam intercepts the ground surface behind the fence . . Gravel check dams shall consist of crushed surfacing base course , gravel backfill for walls , or shoulder ballast. Gravel check dams shall be located every 10 feet along the fence where the fence must cross con- tours . . Refer to Figure 11-4 . 2 . 13 Silt Fence Installation by Slicing Method (p . 374 ) for slicing method details . Silt fence installation using the slicing method specifications : 1 . The base of both end posts must be at least 2 - to 4-inches above the top of the filter fabric on the middle posts for ditch checks to drain properly . Use a hand level or string level , if necessary , to mark base points before install - ation . 2 . Install posts 3 - to 44eet apart in critical retention areas and 6- to 74eet apart in standard applications . 3 . Install posts 24 -inches deep on the downstream side of the silt fence , and as close as possible to the filter fabric , enabling posts to support the filter fabric from upstream water pressure . 4 . Install posts with the nipples facing away from the filter fabric . 2014 Stormwater Management Manual for Westem Washington Volume 11 - Chapter 4 - Page 372 5 . Attach the filter fabric to each post with three ties , all spaced within the top 8- inches of the filter fabric . Attach each tie diagonally 45 degrees through the fik ter fabric , with each puncture at least 1 - inch vertically apart. Each tie should be positioned to hang on a post nipple when tightening to prevent sagging . 6 . Wrap approximately 6-inches of fabric around the end posts and secure with 3 ties . 7 . No more than 24-inches of a 36 -inch filter fabric is allowed above ground level . Compact the soil immediately next to the filter fabric with the front wheel of the tractor, skid steer, or roller exerting at least 60 pounds per square inch . Compact the upstream side first and then each side twice for a total of four trips . Check and correct the silt fence installation for any deviation before compaction . Use a flat-bladed shovel to tuck fabric deeper into the ground if necessary . 2014 Stormwater Management Manual for Westem Washington Volume 11 - Chapter 4 - Page 373 Figure 114 .2 . 13 Slit Fence Installation by Slicing Method Ponding height max. 24" 1 all POST SPACING : XX 7' max. on open runs Attach fabric to 4' max. on pooling areas Top of Fabric upstream side of post Belt FLOW POST DEPTH : top 8" Drive over each side of As much below ground silt fence 2 to 4 times as fabric above ground with device exerting 60 p.s.i , or greater Diagonal attachment 100% compaction 100% compaction doubles strength — — =1 I I=1 I I—III=1 I I I I 1 1 11=��'1 I= I—' m—r 11=i I I—I 11=1 11=1 11=1 I—I 11=1 11=1 11=1 I I—III- -I I L=1 I_I—III—III I I 1=1 11=1 11=1 I I—I 11=1 I=1 I I—III—III=1 I=1 11=1 11=1 I I—I 11=1 I I: =III—III- III—III N I I I—III=III=III=III—. I—i I I=III—III— n l=1 I I—III=1 I I--III=1 I III=1 I I—i I I—I I r I I I—I I1=1I 1=1 11=1 I I- -I I I—II I—I I II_I II 1I1=1I I— o1=1 = Attachment Details: n Gather fabric at posts, if needed. —III—il I-1 N =1 I I—I11=III=III=11 Utilize three ties per post, all within top 8" I_I=III—III— — III=III=III=III=III= El I I—I 11=1 III=1 I I 1=1 11=1I1=1I la 11=1I of fabric. I_1=1I LEI I I—III— in III=11 I11=III=11I Position each tie diagonally, puncturing , I—III 1111 1111111111 Il I I I1=1I111110EI I I—=I , 1 holes vertically a minimum of 1 " apart. ;I I1-1I1-1I LI I I I-1I1=—k I FF 1101 Hang each tie on a post nipple and tighten No more than 24" of a 36" securely. Use cable ties (50 Ibs) or soft fabric is allowed above ground wire. �— Operation Roll of silt fence Post installed Fabric after above compaction ground Silt Fence I— =III=1 II- _III—i I I—I i t=1 11=1 11=1 I L=1 I I 1=1 1200 - 1=1 11=1 I I 1=1 11=1 -III—III=1I1=1I1=1I1=1I1=1I II1= I1=1I1=1 I1=1I' I-1 11=1 11=1 11=1 11=1 11=1 I I 30 111 1=1 I ( M I r l=II I—I 11=1 1=1 I I—III __ 1 I — I i ' —III J I I- L—III 11=1 I I- I---_- — —I I i ' I 111i 1= Horizontal chisel point Slicing blade (76 mm width) ( 18 mm width) Completed Installation Vibratory plow is not acceptable because of horizontal compaction NOT TO SCALE SOOI rFigure II4 . 2 . 13 Silt Fence Installation by Slicing Method DEPARTMENT OF Revised November 2015 E C 0 LOGY Please see http:1Avww. ecy. wa. gov/copyright. html for copyright notice including permissions, State of Washington limitation of liability, and disclaimer. 2014 Stormwater Management Manual for Westem Washington Volume 11 - Chapter 4 - Page 374 Maintenance Standards . Repair any damage immediately . . Intercept and convey all evident concentrated flows uphill of the silt fence to a sed - invent pond . . Check the uphill side of the fence for signs of the fence clogging and acting as a barrier to flow and then causing channelization of flows parallel to the fence . If this occurs , replace the fence or remove the trapped sediment. . Remove sediment deposits when the deposit reaches approximately one-third the height of the silt fence , or install a second silt fence . . Replace filter fabric that has deteriorated due to ultraviolet breakdown . BMP C234 : Vegetated Strip Purpose Vegetated strips reduce the transport of coarse sediment from a construction site by providing a temporary physical barrier to sediment and reducing the runoff velocities of overland flow . Conditions of Use . Vegetated strips may be used downslope of all disturbed areas . . Vegetated strips are not intended to treat concentrated flows , nor are they intended to treat substantial amounts of overland flow . Any concentrated flows must be con - veyed through the drainage system to a sediment pond . The only circumstance in which overland flow can be treated solely by a strip , rather than by a sediment pond , is when the following criteria are met (see Table 114 . 2 .4 Contributing Drain- age Area for Vegetated Strips (p . 375 )) : Table 114. 2 .4 Contributing Drainage Area for Vegetated Strips Average Con#ribu�ting Average Contnb'utmg Areas Max Contnbutmg 'area Area $ tope Percent $lope Flowpath Length 1 . 5H : 1 V or flatter 67 % or flatter 100 feet 2H : 1 V or flatter 50 % or flatter 115 feet 4H : 1 V or flatter 25 % or flatter 150 feet 6H : 1 V or flatter 16 . 7 % or flatter 200 feet 10H : 1 V or flatter 10 % or flatter 250 feet 2014 Stormwater Management Manual for Westem Washington Volume 11 - Chapter 4 - Page 375 Design and Installation Specifications . The vegetated strip shall consist of a minimum of a 25400t flowpath length con tinuous strip of dense vegetation with topsoil . Grass-covered , landscaped areas are generally not adequate because the volume of sediment overwhelms the grass . Ideally , vegetated strips shall consist of undisturbed native growth with a well -developed soil that allows for infiltration of runoff. . The slope within the strip shall not exceed 4H : 1V . ® The uphill boundary of the vegetated strip shall be delineated with clearing limits . Maintenance Standards . Any areas damaged by erosion or construction activity shall be seeded imme- diately and protected by mulch . ® If more than 5 feet of the original vegetated strip width has had vegetation removed or is being eroded , sod must be installed . ® If there are indications that concentrated flows are traveling across the buffer, sur� face water controls must be installed to reduce the flows entering the buffer, or ad & tional perimeter protection must be installed . BMP C235 : Wattles Purpose Wattles are temporary erosion and sediment control barriers consisting of straw , com- post, or other material that is wrapped in biodegradable tubular plastic or similar encas- ing material . They reduce the velocity and can spread the flow of rill and sheet runoff, and can capture and retain sediment. Wattles are typically 8 to 10 inches in diameter and 25 to 30 feet in length . Wattles are placed in shallow trenches and staked along the contour of disturbed or newly constructed slopes . See Figure 11 4 .2 . 14 Wattles ( p . 378 ) for typical construction details . WSDOT Standard Plan I-30 . 30 -00 also provides information on Wattles (http ://www ,wsdot.wa .gov/Design/Standards/Plans . htm#Sectioni) Conditions of Use ® Use wattles : . In disturbed areas that require immediate erosion protection . . On exposed soils during the period of short construction delays , or over winter months . ® On slopes requiring stabilization until permanent vegetation can be estab- lished . 2014 Stormwater Management Manual for Western Washington Volume 11 - Chapter 4 - Page 376 . The material used dictates the effectiveness period of the wattle . Generally , Wattles are typically effective for one to two seasons . . Prevent rifling beneath wattles by properly entrenching and abutting wattles together to prevent water from passing between them . Design Criteria . Install wattles perpendicular to the flow direction and parallel to the slope contour. . Narrow trenches should be dug across the slope on contour to a depth of 3 - to 5- inches on clay soils and soils with gradual slopes . On loose soils , steep slopes , and areas with high rainfall , the trenches should be dug to a depth of 5- to 7 - inches , or 1 /2 to 2/3 of the thickness of the wattle . . Start building trenches and installing wattles from the base of the slope and work up . Spread excavated material evenly along the uphill slope and compacted using hand tamping or other methods . . Construct trenches at intervals of 10 - to 254eet depending on the steepness of the slope , soil type , and rainfall . The steeper the slope the closer together the trenches . . Install the wattles snugly into the trenches and abut tightly end to end . Do not over- lap the ends . . Install stakes at each end of the wattle , and at 44bot centers along entire length of wattle . . If required , install pilot holes for the stakes using a straight bar to drive holes through the wattle and into the soil . . Wooden stakes should be approximately 3/4 x 3/4 x 24 inches min . Willow cuttings or 3/8-inch rebar can also be used for stakes . . Stakes should be driven through the middle of the wattle , leaving 2 to 3 inches of the stake protruding above the wattle . Maintenance Standards . Wattles may require maintenance to ensure they are in contact with soil and thor. oughly entrenched , especially after significant rainfall on steep sandy soils . 2014 Stormwater Management Manual for Westem Washington Volume ll - Chapter 4 - Page 377 Figure 11=4. 2 . 14 Wattles 3' - 4' \. ( 1 .2m) l Straw rolls must be placed along slope 01 Adjacent rolls contours shall tightly abut 10' - 25' (3-8m) i Spacing depends \j on soil type and slope steepness Sediment, organic matter, and native seeds are captured behind the rolls. 3" - 5" (75-125mm) 00000 Live Stake \ 1 " x 1 " Stake \\/� (25 x 25mm) t ( � NOTE: 1 . Straw roll installation requires the placement and secure staking r of the roll in a trench , 3" - 5" (75A25mm) deep , dug on contour. Runoff must not be allowed to run under or around roll. NOT TO SCALE Figure II4 . 2 . 14 Wattles DEPARTMENT OF Revised November 2015 ECOLOGY Please see http://www. ecywa. gov/copyright. html for copyright notice including permissions, State of Washington limitation of liability , and disclaimer. 2014 Stormwater Management Manual for Westem Washington Volume 11 - Chapter 4 - Page 378 . Inspect the slope after significant storms and repair any areas where wattles are not tightly abutted or water has scoured beneath the wattles . Approved as Equivalent Ecology has approved products as able to meet the requirements of BMP C235 : Wattles . The products did not pass through the Technology Assessment Protocol — Ecology (TAPE ) process . Local jurisdictions may choose not to accept this product approved as equivalent, or may require additional testing prior to consideration for local use . The products are available for review on Ecology' s website at http ://www . ecy .wa . gov- /proq rams/wq /stormwater/newtech/eq uivalent. html BMP C236 : Vegetative Filtration Purpose Vegetative Filtration may be used in conjunction with BMP C241 : Temporary Sediment Pond ( p . 388 ) , BMP C206 : Level Spreader ( p . 348 ) and a pumping system with surface intake to improve turbidity levels of stormwater discharges by filtering through existing vegetation where undisturbed forest floor duff layer or established lawn with thatch layer are present. Vegetative Filtration can also be used to infiltrate dewatering waste from foundations , vaults , and trenches as long as runoff does not occur. Conditions of Use . For every five acre of disturbed soil use one acre of grass field , farm pasture , or wooded area . Reduce or increase this area depending on project size , ground water table height, and other site conditions . . Wetlands shall not be used for filtration . . Do not use this BMP in areas with a high ground water table , or in areas that will have a high seasonal ground water table during the use of this BMP . . This BMP may be less effective on soils that prevent the infiltration of the water, such as hard till . . Using other effective source control measures throughout a construction site will prevent the generation of additional highly turbid water and may reduce the time period or area need for this BMP . . Stop distributing water into the vegetated area if standing water or erosion results . Design Criteria . Find land adjacent to the project that has a vegetated field , preferably a farm field , or wooded area . . If the project site does not contain enough vegetated field area consider obtaining 2014 Stormwater Management Manual for Western Washington Volume 11 - Chapter 4 - Page 379 IIIm3el ® 1 Downspout Full Infllfratlon Systems (OMP TGA ®A) Downspout full infiltration systems are trench or drywell designs intended only for use in infiltrating runoff from roof downspout drains . They are not designed to directly infiltrate runoff from pollutant�generating impervious surfaces . Application Projects subject to 1-2 . 5 . 5 Minimum Requirement #5 : On4te Stormwater Management must provide for individual downspout full infiltration systems or full dispersion if feasible . Evaluate the feasibility , or applicability , of downspout full infiltration unless full dispersion is proposed . Use the evaluation procedure below to determine the feasibility of downspout full infiltration . Runoff Modeling for Roof Downspout Full Infiltration If roof runoff is infiltrated according to the requirements of this section , the roof area may be discounted from the project area used for sizing stormwater facilities . Procedure for Evaluating Feasibility 1 . Have one of the following prepare a soils report to determine if soils suitable for infiltration are present on the site : A professional soil scientist certified by the Soil Science Society of America (or an equivalent national program) A locally licensed on-site sewage designer ® A suitably trained person working under the supervision of a professional engineer, geologist, hydrogeologist, or engineering geologist registered in the State of Washington . The report shall reference a sufficient number of soils logs to establish the type and limits of soils on the project site . The report should at a minimum identify the limits of any outwash type soils ( i . e . , those meeting USDA soil texture classes ranging from coarse sand and cobbles to medium sand ) versus other soil types and include an inventory of topsoil depth . 2 . If the lots or site does not have outwash or loam soils , and full dispersion is not feasible , then consider a rain garden or bioretention SMPs (the next lower priority on -site stormwater management system) . 3 . Complete additional site-specific testing on lots or sites containing outwash (coarse sand and cobbles to medium sand ) and loam type soils . Individual lot or site tests must consist of at least one soils log at the location of the infiltration system , a minimum of 4 feet in depth from the proposed grade and at 2014 Stormwater Management Manual for Western Washington Volume N v Chapter 3 - Page 452 least 1 foot below the expected bottom elevation of the infiltration trench or dry well . Identify the NRCS series of the soil and the USDA textural class of the soil horizon through the depth of the log , and note any evidence of high ground water level , such as mottling . 4 . Downspout infiltration is considered feasible on lots or sites that meet all of the fol - lowing : . 3 feet or more of permeable soil from the proposed final grade to the sea- sonal high ground water table . . At least 1400t of clearance from the expected bottom elevation of the infilt- ration trench or dry well to the seasonal high ground water table . . The downspout full infiltration system can be designed to, meet the minimum design criteria specified below . Design Criteria for Infiltration Trenches Figure III -3 . 1 . 2 Typical Downspout Infiltration Trench ( p .455 ) shows a typical downspout infiltration trench system , and Figure III-3 . 1 . 3 Alternative Downspout Infiltration Trench System for Coarse Sand and Gravel (p .456 ) presents an alternative infiltration trench sys- tem for sites with coarse sand and cobble soils . These systems are designed as spe- cified below . General 1 . The following minimum lengths (linear feet) per 1 , 000 square feet of roof area based on soil type may be used for sizing downspout infiltration trenches . Coarse sands and cobbles : 20 LF Medium sand : 30 LF Fine sand , loamy sand : 75 LF Sandy loam : 125 LF Loam : 190 LF 2 . Maximum length of trench shall not exceed 100 feet from the inlet sump . 3 . Minimum spacing between trench centerlines shall be 6 feet. 4 . Filter fabric shall be placed over the drain rock as shown on Figure III -3 . 1 . 2 Typical Downspout Infiltration Trench (p .455 ) prior to backfilling . 5 . Infiltration trenches may be placed in fill material if the fill is placed and compacted under the direct supervision of a geotechnical engineer or professional civil 2014 Stormwater Management Manual for Western Washington Volume 111 - Chapter 3 - Page 453 engineer with geotechnical expertise , and if the measured infiltration rate is at least 8 inches per hour. Trench length in fill must be 60 linear feet per 1 , 000 square feet of roof area . Infiltration rates can be tested using the methods described in Section 3 . 3 . 6 . Infiltration trenches should not be built on slopes steeper than 25 % (4 : 1 ) . A geo- technical analysis and report may be required on slopes over 15 percent or if loc- ated within 200 feet of the top of slope steeper than 40 % , or in a landslide hazard area . 7 . Trenches may be located under pavement if a small yard drain or catch basin with grate cover is placed at the end of the trench pipe such that overflow would occur out of the catch basin at an elevation at least one foot below that of the pavement, and in a location which can accommodate the overflow without creating a sig - nificant adverse impact to downhill properties or drainage systems . This is inten - ded to prevent saturation of the pavement in the event of system failure . Design Criteria for Infiltration Drywalls Figure llk1l .4 Typical Downspout Infiltration Drywell (p .457 ) shows a typical downspout infiltration drywell system . These systems are designed as specified below . General 1 . Drywell bottoms must be a minimum of 1 foot above seasonal high ground water level or impermeable soil layers . 2 . When located in course sands and cobbles , drywells must contain a volume of gravel equal to or greater than 60 cubic feet per 1000 square feet of impervious sur- face served . When located in medium sands , drywells must contain at least 90 cubic feet of gravel per 1 , 000 square feet of impervious surface served . 3 . Drywells must be at least 48 inches in diameter (minimum) and deep enough to contain the gravel amounts specified above for the soil type and impervious sur. face served . 4 . Filter fabric (geotextile) must be placed on top of the drain rock and on trench or dry- well sides prior to backfilling . 5 . Spacing between drywells must be a minimum of 10 feet. 6 . Downspout infiltration drywells must not be built on slopes greater than 25 % (4 : 1 ) . Drywells may not be placed on or above a landslide hazard area or on slopes greater than 15 % without evaluation by a professional engineer with geotechnical expertise or a licensed geologist, hydrogeologist, or engineering geologist , and with jurisdiction approval . 2014 Stormwater Management Manual for Western Washington Volume 111 - Chapter 3 - Page 454 Figure 111=3 . 1 .2 Typical Downspout Infiltration Trench Plan View 4" rigid or 6" flexible roof perforated pipe drain ( 1 � � - - - - - - - - - - - - - - � � sumpw/solid lid infiltration trench roof drain overflow Profile View 4" rigid orb" flexible splash block A perforated pipe CB sump w/solid lid 6" 12' washed rock 1 Yz " - %" I ' min T - - - - - - - 1 ' min r A fine mesh screen T /'1 varies T 10' min . 5' min . Section AA filter fabric compacted backfill 6" 24" rwashed flexible 12 pe Y2' %a' 1240 — NOT TO SCALE Figure III -3 . 1 . 2 Typical Downspout Infiltration Trench DEPARTMENT OF Revised November2015 ECOLOGY Please see http.olA ww. ecy. wa. gov/copyrighthtml for copyright notice including permissions, State of Washington limitation of liability, and disclaimer. 4 2014 Stormwater Management Manual for Westem Washington Volume 111 - Chapter 3 - Page 455 OMP T5 . 12ad Sheet Flow Dispersion Purpose and Definition Sheet flow dispersion is the simplest method of runoff control . This BIVIP can be used for any impervious or pervious surface that is graded to avoid concentrating flows ) . Because flows are already dispersed as they leave the surface , they need only traverse a narrow band of adjacent vegetation for effective attenuation and treatment. Applications and Limitations Use this BMP for flat or moderately sloping ( < 15 % slope ) surfaces such as driveways , sports courts , patios , roofs without gutters , lawns , pastures ; or any situation where con - centration of flows can be avoided . Design Guidelines See Figure V-5 . 3 . 2 Sheet Flow Dispersion for Driveways (p . 910 ) for details for driveways . Provide a 2 -foot-wide transition zone to discourage channeling between the edge of the impervious surface (or building eaves) and the downslope vegetation . This transition zone may consist of an extension of subgrade material (crushed rock) , modular pavement , drain rock , or other material acceptable to the Local Plan Approval Authority . ® Provide a 10400t-wide vegetated buffer for up to 20 feet of width of paved or imper- vious surface . Provide an additional 10 feet of vegetated buffer width for each addi - tional 20 feet of impervious surface width or fraction thereof. ( For example , if a driveway is 30 feet wide and 60 feet long provide a 2046ot wide by 60 -foot long vegetated buffer, with a 2 -foot by 60-foot transition zone . ) No erosion or flooding of downstream properties may result. Runoff discharge toward landslide hazard areas must be evaluated by a geo - technical engineer or a qualified geologist. Do not allow sheet flow on or above slopes greater than 20 % , or above erosion hazard areas , without evaluation by a geotechnical engineer or qualified geologist and approval by the Local Plan Approval Authority . For sites with septic systems , the discharge area must be ten feet downgradient of the drainfield primary and reserve areas (WAC 246 -272A-0210 ) . A Local Plan Approval Authority may waive this requirement if site topography clearly prohibits flows from intersecting the drainfield . 2014 Stormwater Management Manual for Western Washington Volume V - Chapter 5 - Page 908 Runoff Modeling Where BMP T5 . 12 : Sheet Flow Dispersion is used to disperse runoff into an undisturbed native landscape area or an area that meets BMP_T5 . 13 , Post-Construction Soil Quality and Depth (p . 911 ) , and the vegetated flow path is 50 feet or more , the impervious area may be modeled as landscaped area . Where the vegetated flowpath is 25 to 50 feet, use of a dispersion trench (see BMP T5 . 1013 : Downspout Dispersion Systems (0 , 905 ) ) allows modeling the impervious area as 50 % impervious/50 % landscape . This is done in the WWHM3 on the Mitigation Scenario screen by entering the dispersed impervious area into one of the entry options for dispersal of impervious area runoff. For procedures in WWHM 2012 , see Appendix III -C : Washington State Department of Ecology Low Impact Development Flow Modeling Guidance ( p 587 ) . 2014 Stormwater Management Manual for Western Washington Volume V - Chapter 5 - Page 909 Figure V-5 .3 . 2 Sheet Flaw Dispersion for Driveways I T I Locate drain 25' from - ° I ROW if driveway a, slopes toward street. j b: W 700 sq . ft. max. bettbermsberms I � _- Drivewa2_g11 Slope 1 6' min a--►{ 5" Berm Detail ~f = Diagonal 25' vegetated berm with 25' flowpath dispersion 1 / trench / I Plan Driveway Dispersion Trench Driveway Slope Varies and Slopes Toward Street / o fLr Max 2°lp cross slope Rriveway— / Slope # / , _. ` 25 O- Plan era _r7 pq Sheet Flow Dispersion from a Drive way 6 Flat to Moderately Sloping Driveways I NOT TO SCALE INN Figure V- 5 . 3 . 2 Sheet Flow Dispersion for Driveways DEPARTMENT OF Revised January2016 ECOLOGY Please see http.//www. ecywa.gov/copyrighkhtml for copyright notice including permissions, State of Washington limitation of liability, and disclaimer. 2014 Stormwater Management Manual for Western Washington Volume V - Chapter 5 - Page 910 BMP T & 113a Pcst®C® nstruction Soul Quality and Depth Purpose and Definition Naturally occurring (undisturbed ) soil and vegetation provide important stormwater func� tions including : water infiltration ; nutrient, sediment, and pollutant adsorption ; sediment and pollutant biofiltration ; water interflow storage and transmission ; and pollutant decom- position . These functions are largely lost when development strips away native soil and vegetation and replaces it with minimal topsoil and sod . Not only are these important stormwater functions lost, but such landscapes themselves become pollution generating pervious surfaces due to increased use of pesticides , fertilizers and other landscaping and household/industrial chemicals , the concentration of pet wastes , and pollutants that accompany roadside litter. Establishing soil quality and depth regains greater stormwater functions in the post devek opment landscape , provides increased treatment of pollutants and sediments that result from development and habitation , and minimizes the need for some landscaping chem. icals , thus reducing pollution through prevention . Applications and Limitations Establishing a minimum soil quality and depth is not the same as preservation of nat. urally occurring soil and vegetation . However, establishing a minimum soil quality and depth will provide improved on �site management of stormwater flow and water quality . Soil organic matter can be attained through numerous materials such as compost, com� posted woody material , biosolids , and forest product residuals . It is important that the materials used to meet the soil quality and depth BMP be appropriate and beneficial to the plant cover to be established . Likewise , it is important that imported topsoils improve soil conditions and do not have an excessive percent of clay fines . This BMP can be considered infeasible on till soil slopes greater than 33 percent. Design Guidelines Soil retention . Retain , in an undisturbed state , the duff layer and native topsoil to the maximum extent practicable . In any areas requiring grading remove and stock pile the duff layer and topsoil on site in a designated , controlled area , not adjacent to public resources and critical areas , to be reapplied to other portions of the site where feasible . ® Soil quality . All areas subject to clearing and grading that have not been covered by impervious surface , incorporated into a drainage facility or engineered as struc- tural fill or slope shall , at project completion , demonstrate the following : 1 . A topsoil layer with a minimum organic matter content of 10 % dry weight in planting beds , and 5 % organic matter content in turf areas , and a pH from 6 . 0 2014 Stormwater Management Manual for Westem Washington Volume V e Chapter 5 s Page 911 to 8 . 0 or matching the pH of the undisturbed soil . The topsoil layer shall have a minimum depth of eight inches except where tree roots limit the depth of incorporation of amendments needed to meet the criteria . Subsoils below the topsoil layer should be scarified at least 4 inches with some incorporation of the upper material to avoid stratified layers , where feasible . 2 . Mulch planting beds with 2 inches of organic material 3 . Use compost and other materials that meet these organic content require- ments : a . The organic content for "pre-approved " amendment rates can be met only using compost meeting the compost specification for BMP T7 . 30 : Bioretention Cells , Swales , and Planter Boxes (p . 959 ) , with the excep- tion that the compost may have up to 35 % biosolids or manure . The compost must also have an organic matter content of 40 % to 65 % , and a carbon to nitrogen ratio below 25 : 1 . The carbon to nitrogen ratio may be as high as 35 : 1 for plantings com- posed entirely of plants native to the Puget Sound Lowlands region . b . Calculated amendment rates may be met through use of composted material meeting ( a . ) above ; or other organic materials amended to meet the carbon to nitrogen ratio requirements , and not exceeding the contaminant limits identified in Table 220-13 , Testing Parameters , in WAC 173-350-220 . The resulting soil should be conducive to the type of vegetation to be established . . Implementation Options : The soil quality design guidelines listed above can be met by using one of the methods listed below : 1 . Leave undisturbed native vegetation and soil , and protect from compaction during construction . 2 . Amend existing site topsoil or subsoil either at default "pre-approved " rates , or at custom calculated rates based on tests of the soil and amendment. 3 . Stockpile existing topsoil during grading , and replace it prior to planting . Stockpiled topsoil must also be amended if needed to meet the organic mat- ter or depth requirements , either at a default "pre-approved " rate or at a cus- tom calculated rate . 4 . Import topsoil mix of sufficient organic content and depth to meet the require- ments . 2014 Stormwater Management Manual for Western Washington Volume V - Chapter 5 - Page 912 More than one method may be used on different portions of the same site . Soil that already meets the depth and organic matter quality standards , and is not com- pacted , does not need to be amended . Planning/Permitting/lnspectionNerification Guidelines & Procedures Local governments are encouraged to adopt guidelines and procedures similar to those recommended in Guidelines and Resources For Implementing Soil Quality and Depth BMP T5 . 13 in WDOE Stormwater Management Manual for Western Washington . This document is available at: http ://www .soilsforsalmon . org/pdf/Soil BMP Manual pdf Maintenance Establish soil quality and depth toward the end of construction and once estab - lished , protect from compaction , such as from large machinery use , and from erosion . . Plant vegetation and mulch the amended soil area after installation . . Leave plant debris or its equivalent on the soil surface to replenish organic matter. Reduce and adjust, where possible , the use of irrigation , fertilizers , herbicides and pesticides , rather than continuing to implement formerly established practices . Runoff Model Representation Areas meeting the design guidelines may be entered into approved runoff models as " Pasture " rather than " Lawn . " Flow reduction credits can be taken in runoff modeling when BMP T5 . 13 : Post-Con- struction Soil Quality and Depth is used as part of a dispersion design under the con . ditions described in : . BMP T5 . 1013 : Downspout Dispersion Systems (p . 905 ) . BMP T5 . 11 : Concentrated Flow Dispersion (p . 905 ) . BMP T5 . 12 : Sheet Flow Dispersion ( p . 908 ) . BMP T5 . 18 : Reverse Slope Sidewalks (p . 937 ) . BMP T5 . 30 : Full Dispersion (p . 939 ) (for public road projects) 2014 Stormwater Management Manual for Westem Washington Volume V - Chapter 5 - Page 913 Figure VmS , 3 . 3 Planting bed CrosswSec HOD ;. IV,I 1jFI kF. Piz I I � � � IF Id, s arcIF 71. ; tq F ic VA it tit -I Mulch III > 1 Y � Loose soil with F visible dark organic matter 3 ; . IF rl K Fill IF a I IF R r 1 f f. o i VAR IF IF • Y 4 .�J�IF ,� Fitt 14 * ' F I. 0Ai; _ IF III E IF - 4 711 y s i tea :. 4 Lai : of ss ' t es ; .: yFIF IV I IF <r �. } "I Vill w If ke . •,., sty r '% € -cFlIQ ,- Loose or fractured subsoil Reprinted from Guidelines and Resources For Implementing Soil Quality and Depth BMP T5. 13 in WDOE Stormwater Management Manual for Western Washington , 2010, Washington Organic Recycling Council NOT TO SCALE Figure V- 5 . 3 . 3 Planting Bed Cross - Section DEPARTMENT OF Revised January 2016 ECOLOGY Please see http://wwwecy. wa. gov/copyright. html for copyright notice including permissions, State of Washington limitation of liability, and disclaimer. 2014 Stormwater Management Manual for Westem Washington Volume V - Chapter 5 - Page 914 ;# �� o ' �� � Rain Gardens Purpose and Definition Land development projects may not be of sufficient size such that it is practical to con - struct engineered stormwater facilities for flow reduction and pollutant removal . However, the cumulative impact of smaller development projects on the natural hydro logy and water quality of local waters can be significant. To reduce that cumulative impact, small projects (see 1-2 .4 Applicability of the Minimum Requirements (p . 35 ) ) must implement on �site stormwater management BMP ' s (See 1-2 . 5 . 5 Minimum Requirement #5 : On -site Stormwater Management (p . 55 )) . Rain gardens are an on -site stormwater management BMP that can provide effective removal of many stormwater pollutants , and provide reductions in stormwater runoff quantity and surface runoff flow rates . Rain gardens are non -engineered , shallow , landscaped depressions with compost- amended soils and adapted plants . The depression ponds and temporarily stores storm- water runoff from adjacent areas . A portion of the influent stormwater passes through the amended soil profile and into the native soil beneath . Stormwater that exceeds the stor- age capacity is designed to overflow to an adjacent drainage system . Applications and Limitations Rain gardens are an on -site stormwater management BMP option for projects that have to comply with Minimum Requirements # 1 - #5 , but not Minimum Requirements #6 m #9 . For projects electing to use List # 1 of I-2 . 5 . 5 Minimum Requirement #5 : On -site Storm- water Management (p . 55 ) , rain gardens are to be used to the extent feasible for runoff from roofs and other hard surfaces unless a higher priority BMP is feasible . Infeasibility criteria for rain gardens are the same as for bioretention . Please see Biore- tention infeasibility criteria in BMP T7 . 30 : Bioretention Cells , Swales , and Planter Boxes 959 . Although not required , Ecology recommends installation by a landscaping company with experience in rain garden construction . Rain gardens constructed with imported compost materials should not be used within one-quarter mile of phosphorus -sensitive waterbodies . Preliminary monitoring indicates that new rain gardens can add phosphorus to stormwater. Therefore , they should also not be used with an underdrain when the underdrain water would be routed to a phos- phorus-sensitive receiving water. Design Guidelines Refer to the Rain Garden Handbook for Western Washington (2013) for rain garden spe. cifications and construction guidance . 2014 Stormwater Management Manual for Western► Washington Volume V - Chapter 5 - Page 915 For amending the native soil within the rain garden , Ecology recommends use of com- post that meets the compost specification for bioretrention (see BMP T7 . 30 : Bioretention Cells , Swales , and Planter Boxes ( p . 959 ) ) . Compost that includes biosolids or manures shall not be used . For design on projects subject to k2 . 5 . 5 Minimum Requirement #5 : On -site Stormwater Management (p . 55 ) , and choosing to use List # 1 of that requirement, rain gardens shall have a horizontally projected surface area below the overflow which is at least 5 % of the total impervious surface area draining to it. If lawn/landscape area will also be draining to the rain garden , Ecology recommends that the rain garden ' s horizontally projected sur- face area below the overflow be increased by 2 % of the lawn/landscape area . Underdrains Ecology does not recommend the use of underdrains for rain gardens . Design and con - struction of an underdrain system likely requires professional expertise . Where a muni - cipality intends to require or allow underdrained rain gardens in areas with initial infiltration rates between 0 . 3 and 0 . 6 inches per hour, the invert of the underdrain shall be 6 inches above the bottom of the aggregate bedding for the underdrain . A larger dis- tance between the underdrain and the bottom of the aggregate bedding is desirable , but cannot be used to trigger infeasibility due to inadequate vertical separation to the sea - sonal high water table , bedrock , or other impermeable layer. Ecology recommends that the municipality establish standard design specifications and drawings . Maintenance Please refer to the Rain Garden Handbook for Westem Washington (2013) for tips on mulching , watering , weeding , pruning , and soil management. The "Western Washington Low Impact Development ( LID ) Operation and Maintenance (O& M) Guidance Docu - ment" may be consulted for more detailed guidance . BMP T5 . 14B : Bioretention Purpose and Definition Bioretention areas are shallow landscaped depressions , with a designed soil mix and plants adapted to the local climate and soil moisture conditions , that receive stormwater from a contributing area . Bioretention provides effective removal of many stormwater pollutants by passing storm. water through a soil profile that meets specified characteristics . Bioretention can also reduce stormwater runoff quantity and surface runoff flow rates significantly where the exfiltrate from the design soil is allowed to infiltrate into the surrounding native soils . 2014 Stormwater Management Manual for Westem Washington Volume V - Chapter 5 - Page 916 4s Al 07 Y PILfa 10111I10, C0h0VA1k\9 l Y, & IECONOR/ YC OFVEILOPWLE14T DEPARTIVENT Mailing Address: PO Box 547, Anacortes, J 98221 Phone : 360029901984, Fax: 360.293 . 19 C®replete Residential StOrMwater° Plal (i Mono Requirements 1 ® Stour water requirements are based on the 2012 �torrn �ateP Management Manual �®P ��s$QPW Washington QSidQ�l�fil�iW4�➢ . A Oinls 6s provided on the City of gnacortes v�Qbsi$e, under PlanningDepartment, �toP�n �JateP i°�egulatPons, as well as ender the Engineering Division of 'Public Works. (residential construction is exempt from additional stormwater provisions ifft involves �o expansion off i hard surfaces, no use beyond that previously esaistiWg, and Penults in no significant adverse hydrological impact. (wilding perrA it applications for lots that are part of a subdivision that Was recorded no more than 10 Wars prior to the date of the complete building permit application may continue to use the storrnnWatcer codes Pon effect at the time the subdivision application was submitted, iff stormvrater was addressed a $ The 2012/2014 manual. the subdivision/plat level lff construction has not staved as off January Sp 2022, the site will be subject to if your project acids less than 2, 000 sq . ff$, Of new plus replaced hard surfface area, AND which disturbs less than 7,000 square feet of land, you must consider all 13 dements Of the Construction St® Pena va$er pollution plan site con D, dill out de SWPPp Checklist and explain hour the elements are considered, or describe how site conditions render clearly justified the element unnecessary and the exemption from that element is . you will not need to continue with this document, if your project adds 2,000 sqo ft. or more of nevi plus replaced hard surface area, ®(� vyhich disturbs 7, 000 sq , ft. or more of land e li�linimurn Requiremenb I.g ©ff th@ SVjMMWM apply, continue with this document, If adding 5,000 sq , and y®u can ff$. oP more off new hard surfaces/ OR cove and ing 32,670 sq . . or more of vegetation to lawn or landscaped area/ OR Converting 108,900 sq . ft. oP more of native ft vegetation to pasture _ Minimum Requirement, 2o9 of the S4i49Etir'dmrdw apply. If Minimum requirements 1-9 apply, please see the Large Scale Stormwater plan Checklist for additional submittal requirements. Re Bricff Description of the Projedo Pre Developed Conditions Runoff of the Site �a f ° Page 1 ®f 4 ®F � March 22 , 2017 a "J\u�� E ':�1� C�QVQOopQcl C�onc�o�30onQ � �c�no rf u off 40�Q �o��o �NJGu�Ii G`u �Ir08C� « o�da0t �04� p�r���tc�rr�, t�hQ na4c�QaD cOrr�DWa�c g0ysf�c� �r , and draofiaffQ 2© and ffP®m adgacen4 prropmrUesv clan V��gs f oe�ago ❑ Hyclro0ogicay Ske P08RD Collect and analyze information Ors existing conditions to aid in determining low impact development feasibility � which locations are most appropriate to evaporate, transpire, and infiltrate, with the foil®wing information : o Supuc y by Land Surveyor, Engineav'9 oP ©4hev gmgDified peofOssDonalo Show existing public and private development, utility infrastructure, hydrological features (seeps, springs, closed depression areas, drainage swales, streams, wetlands, and eater body survey and classification report showing wetland and buffer boundaries), flood hazard)areas, geological hazards, buffers, aquifer and wellhead protection areas, topographic features that may act as natural stormwater storage, infiltration, or conveyance. Include the natural receiving waters that stormwater runoff will either directly or eventually discharge. Show topography, display acreage and outlines of all drainage basins; existing stormwater drainage to and from: the site, routes to existing, construction, and future flows at all discharge points; and the length of travel from the farthest upstream end of a proposed storm drainage system to any proposed flow control and treatment facility, identify areas of potential erosion problems Show contours as followse ° Up to 10% slopes e 2 ft. contours Over 10% to less than 20% slopes o S ft. contours 20% or greater slopes = 10 ft. contours Elevations at 25 ft. intervals o Soils Haporrto ®one by a soil scientist certified by Soil Science Society of America, licensed sewage designer, or other suitably trained persons working under the supervision of a professional engineer, geologist, hydrologist, or any other professional supervised by an engineering geologist registered In Washington State . (Soils Report Page 2 of 4 March 22, 2017 must include details as listed on Pg. 79). In addition, describe soils by mane, eradlb101ty, settleability, permeability, depth, texture, and soil stricture. Testine should occur between December 1 and Anri11 o Soils Map: Based on the report. o Preliminary Development Site Plan Layout: Locate proposed buildings, roads, parking lots, landscaping features, on-site stormwater management BMPS (Determine BMPs starting on Pg. 95. Suggested BMPs correlate with responses to the 13 elements of the SWPPP, Pg. 237, and preliminary location of stormwater treatment and retention/detention facilities. Considerations are on Pg. 83 . These methods could reduce required facility sizes, but are not required for approval. Show existing and proposed contours, show all cut and fill slopes indicating top and bottom of slope catch lines, and identify developed condition drainage basins. o Survey of existing native"vegetation cover: This is only required if there are native soil and vegetation protection areas proposed for the site. Survey shall be done by a licensed architect, arborist, qualified biologist or project proponent identifying any forest areas on the site and a plan to protect those areas. The preserved area should be placed in a separate tract or protected through recorded easements for individual lots. o Vicinity Map: Clearly locate the property, identify all roads bordering the site, show the route of stormwater off-site to the local natural receiving water, and show significant geographic features and sensitive/critical areas (streams, wetlands, lakes, steep slopes, etc). ❑ Construction Stormwater Pollution Prevention Plan (SWPPP) — The SWPPP shall be implemented beginning with initial land disturbance and until final stabilization. From October 1 through April 30, clearing, grading, and other soil disturbing activities shall only be permitted if shown that silt-laden runoff will be prevented from leaving the site through methods listed on pg. 44 . Best Management Practices (BMPs) Standards and Specifications are listed on pg. 261 . Please see pg. 230 for details on using the Site Analysis to produce the following materials: o Narrative: Explain and justify the pollution prevention decisions made. This will contain concise information concerning existing site conditions, construction schedules, wet season construction activity, constraints, and other pertinent items that are not contained on the drawings. This is based on the 13 Construction Elements, which must be considered unless site conditions render the element unnecessary and the exemption is clearly justified. Elements listed on pg. 44 & described in detail starting on pg. 236. o Drawings a Notes: Where and when the BMPs should be installed, the performance the BMPs are expected to achieve, and .actions that will be taken if the performance goals are not achieved. Show water quality monitoring locations. o Special Reports & Studies: Include any studies (i.e. wetlands delineation). If a facility is required and feasible for Minimum Requirement 5, a PIT Test must be done in the location that the facility location i plan layout. s proposed based on the preliminary development site ❑ Other permits: Any other necessary permits as required by other regulatory agencies. IdentifV if those permits include conditions that affect the drainage plan, or contain more restrictive drainage•related requirements. Prior to final Stormwater Ins action ❑ Permanent Stormwater Control Plan Drawing: Select BMPs based on the Preliminary Development Site Plan Layout from the Site Analysis Summary. Provide a scale drawing of the Page 2 of 4 March22, 2 ® 177 lotQQ� and any Public Public ROW that displays the location of On Site OMPs and the areas served by they-n . These documents will be recorded and attached to a declaration Of covenant and grant of easement associated with each lot that Includes On �sote BMPs, Provide design details, figures, and maintenance instructions for each QMPe Provide a written summary of how it complies with the applicable requirements , Nor to Hnal Oca ❑ OO�Qra4lo� 6'u�airutQniaw�e Mangak Include a manual for each flow control and treatment facilitsy, including any distributed bioretention facilities that are used to help meet flow control and/or treatment requirements, The manual shall include a description of the facility. what it does, and how it works. It roust also Identify and describe the maintenance tasks, and the frequency of each tads , The tasks and frequencies must meet the standards of the SWB�d6� �, W lneBc�de a maintenance activity log that will indicate ghat actions will have been taken and Where it should be Crept and made available for inspection by the City. ❑ O@clavatlon off Covenant V@F PV0'v&WV Ma Ponta iried Vlous Cofrtrol a Treatment and On� Sltc �torru�e��aeQrr ManagefQnt OMPgo any flow control & treatment facilities and On�Site Stormwater management BMPs for which the applicant identifies operation & ru�aintenance to Cie the responsibility of a Private party must have a declaration of covenant and grant of easement. after City approval, the declaration of covenant and grant of easement must he signed and recorded , [design details, figures, and maintenance instructions for any BMP shall be attached. Q map showing the location of newlyplanted and retained trees claimed as flow redaction credits shall also be attached , ❑ WeWd Ofturnientso record total impervious surface area of the site and their locations with the county auditor, 0V sigRing bel©L ' you ave cart'gV'ng that Vag have reach and understand the sC{orrrhl��9Mer requireffi nt so 0 gore that you have chocked off all applicable ao'%esa Z ® 9 Z A;rplica ` Signature — ®ate - Page 4 of 4 March 22, 2017 EXHIBIT "A" 1506 LATITUDE CIRCLE LOT 11 , PLAT OF 48 NORTH P133669 Responses to the "Complete Residential Stormwater Plan Checklist — Minimum Requirements 1.5" . Brief Description of the Project : To construct one Single4amily Residence (SFR ) on a single legal lot within the City of Anacortes . The existing property is located at 1506 Latitude Circle, which is Lot 11, Plat of 48 North , and is 8, 054 square feet in size, Zoned as R2 . Pre Developed Conditions & Runoff on the Site . The property is vacant . The site slopes from the southeast to the northwest at a grade of approximately 2 . 5 % . The property is bounded as follows : SOUTH : Lot 12, 48 North . EAST : Port of Anacortes, P31664, NORTH : Lot 10, 48 North . WEST : Latitude Circle . Developed Conditions & Runoff of The Site : The proposed improvements are as follows : Construct a SFR with an approximate lot coverage of 28 . 5 %, and an impervious lot coverage of 37 . 1%. No detention was required for the Plat of 48 North , but there is an existing water quality bio-swale for the plat . All roof drains and footing drains will be hard lined to the existing stormwater collection system . The point of connection for Lot 11 is located in the westerly corner of the property . After construction , landscaping will be provided to permanently stabilize the site from erosion . Summarize difficult site parameters , the natural drainage system and drainage to and from adjacent properties , including bypass flows : The site slopes from the southeast to the northwest at an approximate grade of 2 . 5 % and the disturbed soil has been seeded and/or mulched to reduce erosion . The only significant tributary drainage the lot may receive is from the Port of Anacortes . Intercept drains will be installed to adequately eliminate impacts from the east . Hydrological Site Plan : Survey : A topographic survey has been performed by Herrigstad Engineering, showing the existing improvements around and within the subject property, along with the existing contours at 2400t intervals . Soils Report . A Geologic Hazard Assessment and Geotechnical Engineering Services report was prepared by GeoEngineers, dated July, 21, 2015, and is already part of the record documents provided to the City of Anacortes . Preliminary Development Site Plan Layout : A " Erosion Control & Site Plan " has been prepared by Landed Gentry Development, Inc . , showing both the existing and proposed improvements as requested . See attached . A "Survey of existing native vegetation cover" was performed by the Urban Forestry Services, Inc . , for the project, dated August 12, 2015, and a tree preservation plan was developed and adopted by the City of Anacortes . A "Vicinity Map" has been provided on Sheet 2 of 2 of the " Erosion Control & Site Plan " , attached . Construction Stormwater Pollution Prevention Plan ( SWPPP ) • See attached . Other Permits : Building Permit for SFR . ® sr PIcanning , Comrnunijy, EcOnomuc ©c�vOloprr en Department (PO d = 547, Ansc0utes9 WA 98221 lCos pr(Dve"Juan Dan) Please check off boxes to show that each element has been read and understood. provide details where applicable and `off certain aspects are unnecessary or elte u� pt, clearly ,usti , Details ® the �� Elements and the correlating RMPs are listed on pg . J136 of the 2014 Corr �ie�atcr Management the 1 al for Western Washington (SWR1gMWW) a q link is provided on the Cit1v of gnacortes website, under planning, Gorr munity, & Economic Development [department, as well as under Stormwater on the Engineering Division of public WorCs°s page. Owner Name: Site AddPess : � A % Tt r: r Ct Prepared By. ANOe,Q .c The Stormwater checklist or building permit determined than : ❑ The 13 elements must be addressed for ❑ These elements must be addressed for construction activity adding under 2,0®® construction activity adding 2,000sq . fto sqo fte of hard surface area . or more of hard surface area. This means that an attached narrative and site plan are required with this document. [ LMder each elQMeUt c Ea d in the best aHaRQ Int Qac tucc� �d�i s used or 'useu rea�onun ff®P those that UsUP 02R ire used. If needs lease sttach narrrratuve to furl jg e� l�un P Oans 00r �u�tuoc4u©ro it �> ELEMENT l : preserve Vegetation/Mark Clearing Limits �3 LcGF�I ❑ ities, including clearing and grading, clearly mark all Before beginning land disturbing activ clearing limits, sensitive areas and their buffers, and trees that are to be preserved within the construction area . ❑ Retain the duff layer, native top soil, and natural vegetation in an undisturbed state to the maximum degree practical. March, 2017 page I of a �( ME lY go Establish Construction Access 0 Limit construction vehicle access and ascot to one route, if possibleo ❑ Stabiliwe access points with a pad of quarry spalis, crushed Pock, or other equivalent BWdp's, to minimize tracking onto roads. ❑ Locate wheel wash or tire (oaths on site, if the stabilized construction entrance is not effective in preventing tracking sediment onto roads. ❑ Off sediment is trackedo Offf site, clean the affected roadway thoroughly at the end of each day, ® P more frequently as necessary (esco wet vveather). Remove sediment from roads by shoveling, Sweeping, or pick up and transport the sediment to a controlled sediment disposal area . ❑ Conduct street cashing Only after sediment is removed in accordance with the above bullet. ❑ Controdischarging street dash d6schar wastewater by pumping back on site or otherwise preventing it from ging into systems tributary to waters of the State . ELEMENT 30a Control Flow Rates 0 Protect properties and waterways downstream of development sites from erosion and the associated discharge of turbid waters due to increases in the velocity and peak volumetric flow rate of stormwater runoff from the project site. ❑ Where necessary to comply with the bullet above, construct stormwvater retention or detention facilities as one of the first steps in grading Assure that detention facilities function properly before constructing site improvement (e .g. impervious surfaces) . 0 If permanent Infiltration ponds are used for flow control during construction, protect these facilities from siltation during the construction phase . ELEMENT 4o Install Sediment Controls ❑ Design, install, and maintain effective erosion controls and sediment controls to minimize the discharge of pollutants. ❑ Construct sediment control BMPs (sediment ponds, traps, filters, etc.) as one of the first steps in grading. `these BMPs shall be functional before other land disturbing activities take place . ❑ Minimize sediment discharges from the site. The design, installation and maintenance of erosion and sediment controls must address factors such as the amount, frequency, intensity and duration of precipitation, the nature of resulting stormwvater runoff, and soil characteristics, including the range of soil particle sizes expected to be present on the site. ❑ Direct stormwvater runoff from disturbed areas through a sediment pond or other appropriate sediment removal OOP, before the runoff leaves a construction site or before discharge to an March, 2017 Page 2 of a infiltration facility. Runoff from filly stabilized areas may be discharged without a sediment removal BMP, but must meet the flMAJ control Performance standard in Element 93, bullet NJ . ❑ Locate RMPs intended to trap sediment on-Site in a manner to avoid irate erence with the movement of juvenile salmonids attomPiting to enter of channel areas or drainages, ❑ Provide and maintain natural buffers around surface 'waters, direct stormwater to vegetated areas to increase sediment removal, and maximize stor ir()lwater infiltration . ❑ Where feasible, design outlet structures that withdravu impounded storenwater from the Surface to avoid discharging sediment that is still suspended lower in the cuter column . RU IEMY so stabilize 500US 0 Stabilize exposed and unworked soils by application of effective RMPs that prevent erosion . Applicable BMPs include, but are not limited to : temporary and permanent seeding, sodding, mulching, plastic covering, erosion control fabrics and matting, Soil application of polyacrylamide PAM), the early application ®f gravel base early on areas to be paved, and dust control. 0 Control stormwater volume and velocity within the site to minimize soil erosion . ❑ Control storrnwater discharges, including both Peak flow rates and total stormwater volume, to minimize erosion at outlets and to minimize downstream channel and stream bank erosion. ❑ Soils [fillust not remain exposed and unworked for more than the time periods set forth below to prevent erosion . o During the dry season May I � Sept 30) o y days o During the wet season (Oct I e Apr 30) e 2 days ❑ Stabilize $® ils at the end of the shift before a holiday or weekend if needed based on the weather forecast. ❑ Stabilize soil stockpiles from erosion, protract with sediment trapping measures, and where Possible, be located away from storm drain inlets, waterways, and drainage channels. ❑ Minimize iniCr>r@ize the amount of soil exposed during construction activity. 0 Minimize the disturbance of steep slopes. ❑ Minimize soil Compaction and, unless infeasible, preserve topsoil . ELEMENT go Protect Slopes ❑ Design and construct cut-and�fill slopes in a manner to minimize erosion. Applicable practices include, but are not limited to, reducing continuous length of slope with terracing and diversions, reducing slope steepness, and roughening slope surfaces (Ex: track walking). Page 3 of a March, 2017 ❑ Divert offs site stormwater Qrun.on ) OF ground water away from slopes and disturbed UgQMP�� areas With stormrs�ateP generated on the interceptor dikes, papas, a swvales. Dff�site stormw�ater should be managed separately from s site . ❑ At the top of slopes, Collect drainage in Pipe slop drains or protected channels to prevent erosion , ® '4NTernporary pipe slope drains must handle the peal( voluUnetric ffloyj Pate calculated using a 10=minute time step from a `hype AA, W�Wear, 24. hoar frequency storm for the developed condition . Alternatively, the 10�year, 1 'houP flow rate predicted/indicated by an approved continuous runoff model, increased by a factor of 1 . 6, maybe used. the hydrologic analysis must use the existing land Cover Condition for predicting flow rates from tributary areas outside the Project limitse For tributary areas on the project site, the analysis must use the temporary or permanent prgect land cover condition, whichever will produce the highest flow rates, If using the Western Washington Hydrology Model QGfipwHM) to predict flows, bare soil areas should be modeled as 'landscaped" area . ® Where 15�rrninute time steps are available in an approved continuous runoff model, they may be used directly without a correction factor. ❑ place excavated material on the uphill side of trenches, consistent vulth safety and space considerations. ❑ Place check dams at regular intervals vvithOn constructed channels that are cut down a slope. ❑ Consider soil types and its potential for erosion . ❑ Stabilise soils on slopes, as speciffied in Element S . ❑ BMP combinations are the most effective method of protecting slopes with disturbed soils, E$c: Use both mulching and straw erosion control blankets . ELEMENT 70 Protect Drain Inlets ❑ protect all storm drain inlets made operable during construction so that stormwater runoff does not enter the conveyance system Without first being Filtered or treated to remove sediment. ❑ Clean or remove and replace inlet protection devices when sediment has filled one-third of the available storage (unless a different standard is specified by the product manufacturer). ❑ Where possible, protect all existing storm drain inlets so that stormwater runoff does not enter the conveyance system without first being faltered or treated to remove sediment. ❑ Keep all approach roads clean . Do not allow sediment and street wash water to enter storm drains without prior and adequate treatment unless treatment is provided before the storm drain discharges to waters of the state . ❑ Inlets should be inspected weekly at a Minimum and daily during storm events, March, 2017 Page 4 of a [edE"EVJV go Stablilze Channels and Outlets ❑ Design, construct, and stabilize all on-site conveyance channels to prevent erosion from the following expected peak flows ° ® `Channels must handle same peak voiumetric flow rate as temporary pipe slope drains listed in Element 6, above. ❑ provide stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent streambanCss, slopes, and downstream reaches at the outlets of all conveyance systems . ❑ The hest method for stabilizing channels is to completely line the channel with a blanket product first, then add check clams as necessary to function as an anchor and to slow the flow of water. ELEMENT 90 Contro0 pollutants ❑ Design, install, implement, and maintain effective pollution prevention measures to minimo the discharge of pollutants. ❑ Handle and dispose of all pollutants, including waste materials and demolition debris that occur on-site in a manner that does not cause contamination of stormwater. ❑ Provide cover, containment, and protection from vandalism for all chemicals, liquid products, petroleum products, and other materials that have the potential to pose a threat to human health or the environment. ®nmsite fueling tanks must include secondary containment, Secondary containment means placing tanks or containers within an impervious structure capable of containing 110 of the volume contained in the largest tank within the containment structure . Doubleurwalled tanks do not require additional secondary containment. ❑ Conduct maintenance, fueling, and repair of heavy equipment and vehicles using spill prevention and control measures . Clean contaminated surfaces immediately f®Ilowing any spill incident. ❑ Discharge wheel wash or tire Bath wastewater to a separate on-site treatment system that prevents discharge to surface water, such as closed400p recirculation or upland land application, or to the sanitary sewer, with local sewer district approval. Wheel wash or tire bath wastewater should not include wastewater from concrete washout areas. ❑ Apply fertilizers and pesticides in a manner and at application rates that will not result in loss of chemical to stormwater runoff. Follow manufacturers' label requirements for application rates and procedures. ❑ Use BMPs to prevent contamination of stormwater runoff by pH_modifying sources. The sources for this contamination include, but are not limited to ; bulk cement, cement kiln dust, fly ash, new concrete washing and curing waters, waste streams generated from concrete grinding and sawing, exposed aggregate processes, dewatering concrete vaults, concrete pumping, and mixer washout waters. Adjust the pH of stormwater if necessary to prevent violations of the water quality standards. Page 5 of a March, 2 ® 1 �' ❑ Assure that washout of concrete trucks is performed o&sitc or in designated concrete washout areas only, Do not wash out concrete trucks onto the ground, oP into Qt®Prn drains, ®pen ditches, streets, or streams. Do not dump ertcess concrete on site, except in designated concrete washout arease Concrete spillage or concrete washout areas. discharge to surface graters of the State is prohibited . Do not use upland land applications for discharging wastewater fromconcrete ❑ Obtain written approval from Ecology and provide to the City before using chemical treatment other than COo2 or dry ice to adjust pH . ❑ Woody debris may be chopped and spread on site. ❑ Conduct oil changes, hydraulic system drain down, solvent and degreasing cleaning operations, fuel tank drain down and removal, and other activities which may result in discharge or spillage Of pollutants to the ground or into stormwa ter runoff using spill p drip pares, revention measures, such as ❑ Clean contaminated surfaces immediately following any discharge or spill incident. Emergency repairs may be performed ®n.site using temporary plastic placed beneath and, if raining, over vehicle. E�EVWEW 11 IM Control DeWatering ❑ Discharge foundation, vault, and trench dewatering water, which have characteristics similar to stormwater runoff at the site, into a controlled conveyance system before discharge to a sediment trap or sediment pond . 0 Discharge clean, non turbid de�watering water, such as well point ground water, to systems tributary to, or directly into surface waters of the State, as specified in Element g, provided the de-watering flow does not cause erosion or flooding of receiving graters or interfere with the operation of the system . Do not route clean dewatering water through storrnwater sediment ponds. Note that "surface graters of the State" may exist on a construction site as well as off site; for example, a creep running through a site . ❑ Handle highly turbid or contaminated dewatering water separately from stormwater. 0 Other treatment or disposal options may include : I . Infiltration 2 . Transport offsite in a vehicle, such as a vacuum flush truck, for legal disposal in a manner that does not pollute state waters. 3 . Ecology-approved onnnsite chemical treatment or other suitable treatment technologies, 4. Sanitary or combined sewer discharge with local sewer district approval, if there is no other option . 5 . Use of a sedimentation bag with outfall to a ditch or swale for small volumes of localized dewatering. ❑ Construction equipment operation, clarnshell digging, concrete tremie pour, or work inside a cofferdam can create highly turbid or contaminated dewatering water. 0 Discharging sediment4aden (muddy) water into waters of the State likely constitutes a violation Page 6 of a March, 2 ®2t7 of water quality standards for turbidity, The easiest Way to avoid discharging muddy viater is through infiltration and preserving vegetation . Maintain HMps ❑ Maintain and repair all temporary and permanent erosion and sediment control Drips as needed to assure continued performance of their intended specifications . function in accordance with DMp ❑ Remove all temporary erosion and sediment control Bl�lps within 30 days after achieving hnaB site stabiBi��ti® n ® r after the temporary ( ps are no longer needed, some tempora erosion and sediment control BMPs are blomdegradable and designed to remain in place foil ry construction such as compost socks. ❑ Provide protection to all BMps installed for the permanent control of stormwater roPn sediment f and compaction . All l�Bi� Ps that are t© remain in place follovv6ng completion of construction shall construction, it shall be be examined and placed in full operating conditions . if sediment enters the f�6�dps during the construction documents Peoved and the facility shall be returned to the conditions specified in . ❑ Remove or stabilize trapped sediment on site . Permanently stabilize disturbed soil resulting from removal of Bmps or vegetation . GLLEMCW 120 Manage the Project � Projects subject to minimurn Requirements � �� must have � Certified EP®sion and Sediment Control LeadQ��� ��� g® P s6te um Projects subject t® Minimum Requirements 1 .5 do not require the inspector to be certified , By tGie inkiati®n of construction, the SWPPP must identify the CESCL or inspector, who shall be present onmske or on� calI at all tunes. Management details starting on C ; . ; .L ❑ Phase development projects to the maximum degree practicable and take into account seasonal work limits to prevent soil erosion and prevent transporting sediment from the site during construction . 0 Inspection and monitoring m Inspect, maintain, and repair all RMPs as needed to assure continued performance of their intended function . ❑ Maintain, update, and implement the SWppp, ❑ Clearing and grading activities for developments shall be permitted only if conducted using an approved site development plan (e.g., subdivision approval). ❑ From Oct 1 through Apr 30, clearing, grading, and other soil disturbing activities is permitted only if shown that the site operator will prevent silt4aden runoff from leaving the site through a combination of the following: March, 2017 Page 7 of g � . Site Conditions including existing vegetati receiving waters, Q/e coverage, slope, soil type, and proximity to � . Limit activities and the extent Of disturbed areas. 3 . proposed erosion and sediment control measures. Weather conditions can influence the seasonal lirni QWac® tatiOn ® n site distuP�iance, yhe City of �tes has the authority to talxe en action per AMC 19. 76 Stormwa, ter, The ffollOvving activities are exempt from the seasonal clearing and grading limitations: lie Routine Maintenance and 2o necessary repair Of erosion and sediment control DMpso Routine maintenance Off puMic facilities or existing utility structures that do not expose the soil or result in the removM of the vegetative cover to soil 3 . Activities where there is Igo inflltraVon of surface water runoff within the site in approved and installed erosion and sediment control facilities, C dCGv�dEMY 1300 protect Loyj Impact Development pApS 0 lff implementing any bioretention facilities or rain hardens, see , for requirements . T _ 02 EPPlicant:Signat�u:re ®at'@ Page a of a March, � ®� � �o r� _ /l Y PILANNWG, OOI�MlL1NITY, & EOOHOAUO DEVELOpWMN1I 48 Al��I�¢�j� Mailing Address: PO Boy �47, AraacoaUs, VIA 98221 OJT Phone: 36002990198491� s: 36019301938 co C®m�iete Residentivi StOrmwater Plan Checkfo Minim" ny Requirements 1 . Stormwater requirements are based on the 2012 Stormwater Management Manual for Western Washington QSWI�BB�J@� W) a A link Is provided on the City of �naG®Pies website, under Planning Department Storrnwater Re a� Datiuns, as well as under the Engineering Oivisi®n of Public �®rlss. Residential ®nSStPaAC�$i®n is exempt fP® i additional Qt®Prriv�,9ater proviso ns ifgo B�caPd surfaces, no use beyond that previously e%fi it ins®BP�@S Via® e�Span4i®n ®f stiW�, and results in Wo 303WificaWt adverse hydrological irnnpacte [wilding permit applications for Dots that are part of a subdivision that was recorded no more than 10 years prior to the date of the complete building perrPiit application may continue to use the storrnwateP codes an effect at the earls the subdivision � pplieatiOn was submitted, if s$ormwateP was addressed at the 2012/2 ion/plat al . if construction has not started as of January 1, 2022, the site will be subject to the 2®�2/20��i manual . � If your project adds Bess than 2,000 sq . ft, of nevy plus replaced hard surface area, AND which disturbs Bess than 7,000 square feet of Band, you ,must consider all 13 Elements of the Construction St® rmwater Pollution Plan QS@fdcond . describe how site condit Fill out the SWPPP Checklist and explain how the elements are considered, or ions render the element unnecessary and the exemption from that element is clearly justified. You will not need to continue with this document. If your project adds 2,000 sq . ft. or more of new plus replaced hard surface area, ®G� which disturbs 7,000 sq , ft. or more of Band - Gv�0 9mum Ragau#vomo is 1o5 of the SWMHH %AS applyo if or more of ve�e$a$i® n $n lawn or landscape continue with this document. If adding apply: and you can adding �5,000 sq . ft. Or more of new hard surfaces/ OR converting 32,670 vegetation to pasture fft. d area/ an convening 1080900 sq . ft. or m®re of native � �liPilrrvuurnnr �Qquire�e�� ao9 of Rho SWv,Mi l�dD�'�un�9 Minimumrequirements � �9 apply, please see the Large Scale Stormwater Plan Checklist for additional submittal requirePnents. Owner Name / I�4Ct�71 i e - .� Sate Qddresgec 4 - _ Grief Description of the Project: t / fir/ 010 C Pre 0eve0®ped Conditions f uROff of the Re , X� March 22, 2017 Page of 4 �cveOOpc�d C ®wdo oOws Z l w® Off Rho SoRe. �l� Gr�GwaP6�Q c offoQ�lt sole pararwetan, the wawral dQaowa5015V520M9 awd clrraowase 20 BRCS flQOM a(apeenR pP®pQ oeg, owClac9ow99 Wpass flowvso ❑ HVdF0009i�al SOW Nano Collect and analyze information on existing conditions to aid in determining low impact development feasibility e which locations are most appropriate to evaporate, transpire, and infiltrate, with the following information : Suffueg9 ley bawd Sm eyOP, ERSPHW, OF 0 hff cleAaDified prOfesso®nalo Show existing Public and private development, utility infPas$ruc$ure, hydrological features (seeps, springs, closed depression areas, drainage swales, streams, wetlands survey and classification , and water body report sh®wing wetland and buffer boundaries), flood hazard areas, geological hazards, buffers, aquifer and wellhead protection areas, topographic features that may act as natural stormwater storage, infiltration, or conveyance. Include the natural receiving waters that stormwater runoff will either directly or eventually discharge. Show topography, display acreage and outlines of all drainage basins; existing stormwater drainage to and from the site; routes to existing, construction, and future flows at all discharge points; and the length of travel from the farthest upstream end of a proposed storm drainage system to any proposed flow control and treatment facility. Identify areas of potential erosion problems Show comoues as follows: UP to 10% slopes = 2 ft. contours Over 10% to less than 20% slopes m S �. contours 20% or greater slopes = 10 ft. contours © Elevations at 2S fte intervals o Soils Reporto ®one by a soil scientist certified by Soil Science Society of America, licensed sewage designer, or other suitably trained persons working under the supervision of a professional engineer, geologist, hydrologist, or any other professional supervised by an engineering geologist registered in Washington State. (Soils Report Larch 22, 2017 page 2 of 4 i must include details as listed on Pg. 79). In addition, describe soils toy Warne, erodibility, settleability, permeability, depth, texture, and soil structure * Testine should occur between December 1 and April , o Soils Map: Based on the report. o Preliminary Development Site Plan Layout: Locate proposed buildings, roads, parking lots, landscaping features, on-site stormwater management BMPS (Determine BMPS starting on Pg. 95 . 5uggested BMPS correlate with responses to the 13 elements of the SWPPP, Pg. 237, and preliminary location of stormwater treatment and retention/detention facilities. Considerations are on Pg. $3 . These methods could reduce required facility sizes, but are not required for approval. Show existing and Proposed contours, show all cut and fill slopes indicating top and bottom of slope catch lines, and identify developed condition drainage basins. o Survey of existing native vegetation cover: This is only required if there are native soil and vegetation protection areas proposed for the site. Survey shall be done by a licensed architect, arborist, qualified biologist or project proponent identifying any forest areas on the site and a plan to protect those areas. The preserved area should he placed in a separate tract or protected through recorded easements for individual lots. o Vicinity Map: Clearly locate the property, identify all roads bordering the site, show the route of Stormwater off-site to the local natural receiving water, and show significant geographic features and sensitive/critical areas (streams, wetlands, lakes, steep slopes, etc). ❑ Construction Stormwater Pollution Prevention Plan (SWPPP) — The SWPPP shall be implemented beginning with initial land disturbance and until final stabilization. From October 1 through April 30, clearing, grading, and other soil disturbing activities shall only be permitted if shown that silt-laden runoff will be prevented from leaving the site through methods listed on pg. 44 . Best Management Practices (BMPs) Standards and Specifications are listed on pg. 261 . Please see pg. 230 for details on using the Site Analysis to produce the following materials: o Narrative: Explain and justify the pollution prevention decisions made. This will contain concise information concerning existing site conditions, construction schedules, wet season construction activity, constraints, and other pertinent items that are not contained on the drawings. This is based on the 13 Construction Elements, which must be considered unless site conditions render the element unnecessary and the exemption is clearly justified. Elements listed on pg. 44 & described in detail starting on pg. 236. o Drawings & Notes: Where and when the BMPS should be installed the performance BMPS are expected to achieve, and .actions that will be taken if the performance goals he are not achieved. Show water quality monitoring locations. o Special Reports & Studies: Include any studies (i.em wetlands delineation). If a facility is required and feasible for Minimum Requirement S, a PIT Test must be done in the location that the facility location is proposed based on the preliminary development site plan layout. ❑ Other permits: Any other necessary permits as required by other regulatory agencies. Identify if those permits include conditions that affect the drainage plan, or contain more restrictive drainage-related requirements. PO vior to final Stormwater Ins ection ❑ Permanent Stormwater Control Plan Drawing: Select BMPS based on the Preliminary Development Site Plan Layout from the Site Analysis Summary. Provide a scale drawing of the March 22, 2017 Page 3 of 4 Oot�s➢ and any public ROW that displays the location of C)n�Sote OMPs and the areas served by thorn . These documents woll be recorded and attached to a declaration Of covenant and grant of easement associated with each lot that includes On -site BMPs. Provide design details, figures, and maintenance instructions for each HMP. Provide a written summary of how it complies with the applicable requirements , VIROF t0 Fhaao ®ccuoancy ❑ ®pQPati®n & IVlafirateWaWQe f,`vl@naal0 include a manual for each flow control and treatment facility, Including any distributed bloretention facilities that are used to help meet flow control and/or treatment requirements. The manual shall include a description of the facility, what of does, and how it WGrks, It must also identify and describe the maintenance tasks, and the frequency of each task , The tasks and frequencies must meet the standards of the Sl3iyMM yjw. lnclude a maintenance activity log that will indicate what actions vrill have Keen taken and where it should be kept and made available for inspection by the City. ❑ Off C©l9eGDaWt 0r pro ee�itc leyMao W`�alned HovLy C@HRVOl A Treatr7 em Fac lltvos and aW� Note �4oPrf BC^S��QP H@Wase6faeW ORi/020 Any flow control & treatment facilities and ®W�Site Stormwater management BMPs for which the applicant identifies operation � maintenance to be the responslh RY off a private partgy must have a declaration Of covenant and grant of easement. After City approval, the declaration of covenant and grant of easement must be signed and recorded . Design details, figures, and maintenance instructions for any BMP shall be attached . map showing the location Of newly Planted and retained trees claimed as now reduction credits shall also be attached . ❑ PQcord ©ocummso Record total impervious surface area of the site and their locations with the county auditor, y �l n 'ng boo"' }you are canfylraff th@R you have read and undOrstarad the st®rrnwater PequOPementsa 02 sire that you have chocked off Ml applicable bones. [App;lrica Signature � �- Date - Page 4 off 4 March 22, 2017 EXHIBIT "A" 1506 LATITUDE CIRCLE LOT 11, PLAT OF 48 NORTH P133669 Responses to the "Complete Residential Stormwater Plan Checklist — Minimum Requirements 1- 5" . Brief Description of the Project : To construct one Single4amily Residence (SFR ) on a single legal lot within the City of Anacortes . The existing property is located at 1506 Latitude Circle, which is Lot 11, Plat of 48 North , and is 8, 054 square feet in size, Zoned as R2 . Pre Developed Conditions & Runoff on the Site : The property is vacant . The site slopes from the southeast to the northwest at a grade of approximately 2 . 5 % . The property is bounded as follows : SOUTH : Lot 12, 48 North , EAST : Port of Anacortes, P31664 , NORTH : Lot 10, 48 North . WEST: Latitude Circle . Developed Conditions & Runoff of The Site .• The proposed improvements are as follows : Construct a SFR with an approximate lot coverage of 28 . 5 %, and an impervious lot coverage of 37 . 1 % . No detention was required for the Plat of 48 North , but there is an existing water quality bio-swale for the plat . All roof drains and footing drains will be hard lined to the existing stormwater collection system . The point of connection for Lot 11 is located in the westerly corner of the property. After construction , landscaping will be provided to permanently stabilize the site from erosion . Summarize difficult site parameters the natural drainage system and drainage to and from adjacent properties including bypass flows : The site slopes from the southeast to the northwest at an approximate grade of 2 . 5 % and the disturbed soil has been seeded and/or mulched to reduce erosion . The only significant tributary drainage the lot may receive is from the Port of Anacortes . Intercept drains will be installed to adequately eliminate impacts from the east . Hydrological Site Plan . Survey : A topographic survey has been performed by Herrigstad Engineering, showing the existing improvements around and within the subject property, along with the existing contours at 2400t intervals . Soils Report : A Geologic Hazard Assessment and Geotechnical Engineering Services report was prepared by GeoEngineers, dated July, 21, 2015, and is already part of the record documents provided to the City of Anacortes . Preliminary Development Site Plan Layout : A " Erosion Control & Site Plan " has been prepared by Landed Gentry Development, Inc . , showing both the existing and proposed improvements as requested . See attached . A "Survey of existing native vegetation cover" was performed by the Urban Forestry Services, Inc. , for the project, dated August 12, 2015, and a tree preservation plan was developed and adopted by the City of Anacortes . A "Vicinity Map" has been provided on Sheet 2 of 2 of the " Erosion Control & Site Plan ", attached . Construction Stormwater Pollution Prevention Plan (SWPPP ) : See attached . Other Permits : Building Permit for SFR . �8 �1 Planning , Cori munoy, aDC 0SIVIRD®PMonft ®epay1mgnt ! I euPO Loy 547, Qnsco Pik y ,.wf , PDT : ��® o ��� , 198-A e0 Please check off boxes to showy that each clement has been read and understood. provide details where applicable and if certain aspects are unnecessary or exempt, clearly ousti e Details of the �� Elements and the correlating f€ Mps are listed on P& Z36 of the 2014 Storm water Management o Manual 13 le Western Washington Qfor SWMMWW) . q link is provided on the City of Anacortes wvebsite, under planning, Community, A Economic Development Department, as well as under St®Pmw9ateP on the Engineer* ing Division of Public Works page . o�11,rner Name :_ ;; /1la� %� 41v1A C ��J L L Site Address: �p Prepared By: I"q ljOt, el f %/1 The Stormwater checklist or building permit determined that : ❑ The 13 elements must be addressed for ❑ `these elements must be addressed for construction activity adding under 2,000 sq , , of hard surface area , construction activity adding 2;000 sq . ft. or more of hard surface area. This means that an attached narrative and site plan are required with this document. NJt�caSc P each e0ert'eD e� lain the best �araa e ieffl Pa Bees l l �s , used ar `usti reas®"aroa ot 9L ff�P goose that Will n be used. needed lease used attach a naEya ��stifeationo tudc t® farheQ cis laln lays or ELEMENT jo preserve Vegetation/MaPk Clearing Limits ❑ Before beginning land disturbing actuvities, including clearing and grading, clearly mark all clearing limits, sensitive areas and their buffers, and trees that are to be preserved within the construction area . ❑ Retain the duff layer, native topsoil; and natural vegetation in an undisturbed state to the maximum degree practical. 1:13: MEN March, 2017 Page I of 8 CdEMENT 2a Establish Construction access ❑ Limit construction vehicle access and exit to one route, if possible . 0 Stabilize access points with a pad Of quarry spalls, crushed rods, rninirnize track ®P other equivalent BMG�s, to ing onto roads. ❑ locate wheel wash or tips baths on site, 6 roads.f the stabilized construction entrance is not effective in preventing tracking sediment onto ❑ lff sediment is tracked off site, clean the affected roadway thoroughly at the end of each day, or more frequently as necessary (emo wet weather) , Remove sediment from roads by shovelin , sweeping, or pick up and transport the sediw�ent g to a controlled sediment disposal area . 0 conduct street washing only after sediment is removed in accordance with the above bullet. 0 Control street wash wastewater by pumping back on site or otherwi discharging into systems tributary to waters of the Statep se preventing it from EdEi` EW 300 Control blow Batas ❑ Protect pr®perties and waterways downstream of development sites from erosion and the associated discharge of turbid raters due to increases in the velocity and peals volumetric now of stormwater runoff from the project site , ❑ Where necessary to comply with the bullet above, construct stormwater retention or detention facilities as one of the first steps in grading. Assure that detention facilities function properly before constructing site improvement (e.g. impervious surfaces) . ❑ if permanent infiltration ponds are used for flow control during construction, protect these facilities from siltation during the construction phase. ELEMENT 4a Install Sediment Controls ❑ Design, install, and maintain effective erosion controls and sediment controls to minimize the discharge of pollutants. 0 Construct sediment control BMPs (sediment ponds, traps, filters, etc. ) as one of the first steps in grading. These BMIPs shall be functional before other land disturbing activities take place. 0 Minimize sediment discharges from the site. The design, installation and maintenance of erosi and sediment controls must address factors such as the amount, frequency, intensity and ton duration of precipitation, the nature of resulting stormwater runoff, and soil characteristics, including the range of soil particle sizes expected to be present on the site . 0 Direct stormwater runoff from disturbed areas through a sediment pond or other appropriate sediment removal OMP, before the runoff leaves a construction site or before discharge to an March, 2017 Page 2 of a infiltration facility. Runoff from fully stabilized areas may he discharged without a sediment removal BMP, but must meet the flow control performance standard in Element 8% bullet al . ❑ Locate [ MPS intended to trap sediment on-site in a manner to avoid interference with the movement of Juvenile salrnonids attempting to enter off"channel areas or drainages. 0 provide and maintain natural buffers around surface waters, direct st®rm%�Lfater to vegetated areas to increase sediment removal, and martiPuize 4t®PmwateP infiltration. ❑ Where feasible, design outlet structures that withdraw impounded stormwater from the surface to avoid discharging sediment that is sMl suspended lower in the water column . CdE i�v�i EW go SUN 'Re Soils ❑ Stabilize exposed and unworked soils by application of effective HMps that prevent erosion . Applicable [` MPs include, but are not limited too temporary and permanent seeding, sodding, mulching, plastic covering, erosion control fabrics and matting, soil applica control, tion of polyacrylamide QPQI�I�, the early application ®f gravel base early on areas to be paved, and dust 0 Control stormwater volume and velocity within the site to minimize soil erosion . ❑ Control stormwater discharges, including both peak flow rates and total stormwater volume, to minimize erosion at outlets and to minimize downstream channel and stream bank erosion. ❑ Soils must not remain exposed and unworked for more than the time periods set forth below to Prevent erosion . o During the dry season (May I e Sept 30) a 7 days o During the wet season (Oct I Apr 30) : 2 days 0 Stabilize soils at the end of the shift before a holiday or weekend if needed based on the weather forecast. 0 Stabilize soil stockpiles from erosion, protect with sediment trapping measures, and where Possible, be located away from storm drain inlets, waterways, and drainage channels. 0 Minimize the amount of soil exposed during construction activity, ❑ Minimize the disturbance of steep slopes . ❑ Minimize soil compaction and, unless infeasible, preserve topsoil . ELEMENT sm protect dopes ❑ Design and construct cut-and-fill slopes in a manner to minimize erosion. Applicable practices include, but are not limited to, reducing continuous length of slope with terracing and diversions, reducing slope steepness, and roughening slope surfaces (Ex: track walking) . Gage 3 of a March, 2017 ❑ Divert off�site stormwater Qrun�on ) or ground water away from slopes and disturbed areas with interceptor dikes, pipes, and/or swales. Off-site stoPm�rrater should be managed separately fromstormwater generated on the site . ❑ At the top of slopes, collect drainage in pipe slop dPai erosiona ns or Protected channels t® prevent o " Temporary pipe slope drains must handle the peal, voNmetric flow Pate calculated using a 10�minute time step from a `hype AA, 10�year, 24�hour frequency storrn for the developed condition . Alternatovely, the �10myear, 1 �hour now rate predicted/indicated by an approved continuous runoff model, increased by a factor of 1 . 6, may be used . The hydrologic analysis must use the Misting land cover condition for predicting now rates from tributary areas outside the project limitse for tributary areas on the project site, the analysis must use the temporary or permanent project land cover condition, whichever will produce the highest flow rates, if using the Western Washington Hydrology Model QWWHM) to predict flows, bare soil areas should be modeled as "landscaped" area . o Where 15�un6nute time steps are available in an approved continuous runoff model, they may be used directly without a correction factor. ❑ Place excavated material on the uphill side of trenches,considerations. consistent with safety and space 0 Glace check dams at regular intervals within constructed channels that are cut down a slope. ❑ Consider soil types and its potential for erosion . ❑ Stabilize soils on slopes, as specified in [dement S . ❑ BMP combinations are the most effective method of protecting slopes with disturbed soils. Ex. Use both mulching and straw erosion control blankets, ELEMENT 7o Protect ®Pain inlets ❑ protect all storm drain inlets made operable during construction so that stormwater runoff does not enter the conveyance system without first being filtered or treated to remove sediment . 0 Clean or remove and replace inlet protection devices when sediment has filled one-third of the available storage (unless a different standard is specified by the product manufacturer). ❑ Where possible, protect all existing storm drain inlets so that stormwater runoff does not enter the conveyance system without first being filtered or treated to remove sediment. ❑ beep all approach roads clean . ®o not allow sediment and street wash water to enter storm drains without prior and adequate treatment unless treatment is provided before the storm drain discharges to waters of the State . ❑ Inlets should be inspected weekly at a minimum and daily during storm events. Page 4 of 8 March, 2017 L ICE lv�J�i � o Stabilize Channels and Outlets 0 Design, construct, and stabilise all on�site conveyance channels to prevent erosion from the following expected peak flows : ® *Channels must handle same peak volumetric flow rate as temporary pipe slope drains listed in Element G. above . 0 provide stabllization, including armoring material, adequate to prevent erosion of outlets, adjacent streambanks, slopes, and downstream reaches at the outlets of all conveyance systernso ❑ The best method for stabilizing channels is too completely line the channel with a blanket product first, then add check darns as necessary to function as an anchor and to slow the flow of water. REMEM7 90 contro0 Pollutants 0 Design, install, implement, and maintain effective pollution prevention measures to minimize the discharge of pollutants. 0 Handle and dispose of all pollutants, including waste materials and demolition debris that occur on-site in a manner that does not cause contamination of stormwater. ❑ Provide cover, containment, and protection from vandalism for all chemicals, liquid products, petroleum products, and other materials that have the potential to pose a threat to human health or the environment. ®n �site fueling tanks must include secondary containment. Secondary containment means placing tanks or containers within an impervious structure capable of containing 110% of the volume contained in the lamest tank within the containment structure . ®oubleawalled tanks do not require additional secondary containment. ❑ Conduct maintenance, fueling, and repair of heavy equipment and vehicles using spill prevention and control measures. Clean contaminated surfaces immediately following any spill incident. 0 Discharge wheel wash or tire bath wastewater to a separate on �site treatment system that prevents discharge to surface water, such as closed400p recirculation or upland land application, or to the sanitary sewer, with local sewer district approval. Wheel wash or tire bath wastewater should not include wastewater from concrete washout areas . ❑ Apply fertilizers and pesticides in a manner and at application rates that will not result in loss of chemical to stormwater runoff. Follow manufacturers' label requirements for application rates and procedures. ❑ Use BMPs to prevent contamination of stormwater runoff by pWrnodifying sources. The sources for this contamination include, but are not limited to : bulk cement, cement kiln dust, fly ash, new concrete washing and curing waters, waste streams generated from concrete grinding and sawing, exposed aggregate processes, dewatering concrete vaults, concrete pumping, and mixer washout waters. Adjust the ply of stormwater if necessary to prevent violations of the water quality standards. Page 5 of a March, 2017 ❑ Assure that washout Of concrete trucks is performed off.site or in designated concrete washout areas only. ®o not wash out concrete trucks onto the ground, OF into storm drains, open ditches, streets, or streams , Do not dump excess concrete on site, except in designated concrete washout areas. Concrete spillage or Concrete discharge to surface waters of the State is prohibited . Do not use upland land applications for discharging wastewater from concrete washout areas. ❑ Obtain written approval from Ecology and provide to the City before wing Chemical treatment other than C 02 or dry ice to adjust pH . ❑ Woody debris may be chopped and spread on site . ❑ Conduct oil changes, hydraulic system drain down, solvent and demgreasing Cleaning operations, fuel tank drain down and removal, and ®thee activities which may result in discharge or spillage Of pollutants to the ground or into stormwater runoff f1 using spill preventi drip pans, ®n measures,, such as ❑ Glean contaminated surfaces immediately following any discharge or spill incident. Emergency repairs may be performed on�site using temporary plastic placed beneath and, if raining, over the vehicle . ELEMENT 20o Control De Watering ❑ Discharge foundation, vault, and trench dewatering water, which have characteristics similar to stormwater runoff at the site, into a controlled conveyance system before discharge to a sediment trap or sediment pond . ❑ Discharge clean, non4urbid de=watering water, such as vvdi�point ground water, to systems tributary to, or directly into surface waters of the State, as specified in Element g, provided the de-watering flow does not cause erosion or flooding of receiving waters or interfere with the operation of the system , Do not route clean dewatering water through stormwater sediment ponds. Note that "surface waters of the State" may exist on a construction site as well as off site, for example, a creek running through a site . 0 Handle highly turbid or contaminated dewatering water separately from stormwater. ❑ Other treatment or disposal options may include . 1 . Infiltration 2 . `transport off-site in a vehicle, such as a vacuum flush truck, for legal disposal in a manner that does not pollute state waters. 3 . Ecology�approved on-site chemical treatment or other suitable treatment technologies. 4. Sanitary or combined sewer discharge with local sewer district approval, if there is no other option . 5 . Use of a sedimentation bag with outfall to a ditch or swale for small volumes of localized dewatering. ❑ Construction equipment operation, clarnshell digging, concrete tremle pour, or work inside a cofferdam can create highly turbid or contaminated dewatering water, ❑ Discharging sediment-Baden (muddy) water into waters of the State likely constitutes a violation Page 6 of g March, 2017 Of water quality standards for turbidity. The easiest way to avoid discharging muddy water is through infiltration and preserving vegetation . ELEMENY 1100 Maintain Camps ❑ Maintain and repair ail temporary and permanent erosion and sedornent control BIAPs as needed to assure continued performance of their intended function in accordance with Bd�Ji p specifications . 0 Remove all temporary erosion and sediment control BMps wothin 30 days after achieving Donal site stabilization or after the temporary o Mps are no Binger needed, Some temporary erosion and sediment control BMPs are biodegradable and designed to remain in place following construction such as compost socks . 0 provide protection to all BMPs installed for the Permanent control of stormwater fromsediment and compaction. All �lAps that are to remain in place following completion of construction shall be examined and placed on full operating conditions . if sediment enters the BMPs during construction, it shall be removed and the facility shall be returned to the conditions specified in the construction documents. 0 Remove or stabilize trapped sediment on site . permanently stabilize disturbed soil resulting from removal of BMPs or vegetation . ELIEMENT 120 Manage the project � Projects subject to Minimum Requirements 1 �9 must have a Certified Erosion and Sediment Contro0 Lead QCESCLj for site inspections. Projects subject to Minimum Requirements I �5 do not require the inspector to be certified . By the initiation of construction, the SWPPP must odentofy the CESCd or inspector, who shall be present on �site or oncocalI at all tunes, Management details starting on i, ❑ phase development projects to the maximum degree practicable and take into account seasonal work limits to prevent soil erosion and prevent transporting sediment from the site during construction . ❑ Inspection and monitoring � Inspect, maintain, and repair all BMPs as needed to assure continued performance of their intended function . ❑ Maintain, update, and implement the SWPPp, 0 Clearing and grading activities for developments shall be permitted only if conducted using an approved site development plan (e.g., subdivision approval) . ❑ From Oct 1 through Apr 30, clearing, grading, and other soil disturbing activities is permitted only if shown that the site operator will prevent silt4aden runoff from leaving the site through a combination of the following. Page y of g March, 2017 � . Site conditions including existing vegetative coverage, slope, soil type, and proximity to receiving 'waters . � . Limit activities and the extent of disturbed areas. 3 . Proposed erosion and sediment control measures. Weather conditions can influence the seasonal limitation on site disturbance. The City of Anacortes has the authority to take enforcement action per AMC 19. 76 Stormnfater. 0 The following act* 'ties are exempt ffrorn the seasonal clearing and grading limitations: I . Routine maintenance and necessary repair of erosion and sediment control BMps; 2 . Routine maintenance of public facilities or existing utility structures that do not expose the seal or result In the removal Of the vegetative cover to soil 3 . Activities where there 6s 100 infiltration Of surface water runoff within the site 9n approved and installed erosion and sediment control facilities . 'LEl�lrE%y .c3o protect Low lrnpact Deve0opmerat BMPS ❑ If implementing any bloretent¢on facilities or rain gardens, see oP: 7.5.1 for requirements . 00 44 4Applicaht Signature D e March, 2017 page 8 of a Iai�di�Y�ih7i����a�a�a�il���ai�l 201111 11201128 AUDITORS 4 8 NORTH PLAT 8c PUD Skagit County Auditor $+ saoo CERIm TIFICATE 5/2/2017 Page 1 of 311 :40AM RECORD OF SURVEY AT THE. ;ftOrOU 1 1, OF DALE K. HERRIGSTAD SECTION 22 , TOWNSHIP 35 NORTH , RANGE 1 EAST , IP. M . ° ° , �`I ^ ' ,, CITY OF ANACORTES , WASHINGTON ;: mpm 'Cp.- ,._., 1, A 1 Pb1-Y UDI R GENERAL INFORMATION "`` _ It 1 . Assessor' s Account No.s 350122-4-004-0000, P31s81 . . SKAGIT COUNTY TREASURERS CERTIFICATE DEDICATIONmitt I certify that all taxes heretofore levied and which have become a lien upon the Know All Men by these Present th4L,"SKp1T STPT BANB4t `rrrtgage" Bolder, and 2. Description and exception information : from the 3rd lands herein described have been fully paid and discharged accordin 48 NORTH ON FIDALGO ISLAND, LC�,y IS ; perty_rbwnar of #Yte thrid hereby platted , Revision to Subdivision Guarantee, Order No: 153377-OA, records of my office, up to and including the year of 20 _. 1et � S g/ declare this plat and dedicatgp _to trig itse �: public frex r, streets and dated March 7 , 2017 , 5' oFflcw� fC`a avenues shown hereon and„the'-use ''tyer4of _kor all p {u c purposes consistent 3. This property is SUBJECT TO and TOGETHER WITH Ad G with the use thereof for �blfc fEjghwa�„_ pur uses } g'eIt with the right to make easements, reservations, restrictions , covenants and other Certifie this � day of _ !� I(A1�1_ 20 F- v�� �1 all necessary slope for cuff. o{td ft'.ls upro toe . c�rtd blocks shown hereon in instruments of record including but not limited to those f , rri�ir the original reason�le grad"zng ikf 011 such,,. str ets %and avenues shown hereon. instruments referred to in the Subdivision Guarantee ill jj The Owners an0 =#heW'z sigr Frzr by``;vfaivei ; all&.&aims for damages against referenced under Note 2 above. Said report lists documents Ska i Coun rea rer et� �� which May be rsCca" netl! o '';ihe : a 'ac'ant rct erties b the construction, g Y k- d. p ... p Y recorded under Auditors File Number AF 732440 (Avigation /a SEAL drainage ,critt _ maitYt '-tue of.= ail reed "mod or area . Easement) , AF 200807220033 ( Record of Survey) , AF CITY OF ANACORTES APPROVALS af �'�� _ Imp. 201607050142 ( 10 ' wide Puget Sound Easement over new The Planning QOMMpis ion of thi City of Anacortes meeting in regular pit m utilities), AF 201612060089 ( 10 ' wide Puget Sound Easement session on did find that the 48 North Plat & over new utilities) , AF 201 61 21 901 47 (Covenants, Conditions PUD serves the public use & in erest & has authorized the Subdivision -and Restrictions on adjoining property) and AF 201702240096 Administrator to execute its written approvals . (YsJRTH ON 'x_1D ISLAND, LLC (access and utility easement over Lot 17 as shown on the _� Plat) . Deed of Trust recorded under AF 201605130083 Signature of Planning Director lkp ' . (Skagit State Bank) . � A prov I by the c��n�cil of th City of Anacortes, WA, this 4. Residential Low Density (R2) . day of r ` li t � r[1 20 S1IT SikTE ' 'ANK 5 . Water Supply: City of Anacortes. Jj 6 . Sewer Disposal: City of Anacortes ATTEST: City Clerk /jC ;- - __ Sate" of Washington 7. Storm Sewer: City of Anacortes 77 \\ '`` _ - oucII §iy of Skagit �1 � I Examined a approve this day of Aw IL , =I L' "; 20 I ""` I Citify that I know of have satisfactory evi�de�nce that NC 5 S tti JnC%I _ P NIL, , ' ..`' ::, __• ...signed this instrument, on oath stated that O/she/) wa /are) authorized to execute the 14 Imp_ instrument and acknowledged it as the ryAe m Vier' of City e pt 48 NORTH ON FIDALGO ISLAND , LLC to be the free and voluntary act of such party for the uses and purposes mentioned in the instrument. Given under my hand and official seal this day of Win_ _� 20 17 Imp +I :..... Notary Public in and for the State of Washington It p, Pn , inun,. Name printed P�111Y1 n L VJGI t t �� 5� WECC� mmo Residing at f�V1ACDv�CS WA \=�.pps0 fX:9Fy ;; NOTES 'im - � / L /2018 = Ua�l���o1ARY s My commissions expires _ 1 . Subject to Declaration of Covenants, Conditions, c N; Pue��o 0 :;o= Restrictions , (CC&R' s) , recorded under; 9pi1"01 DA " ttm Imp OFIWlitS AFN (JI ' FIND MONUMENT IN J` CASE WITH COVER V imp 2. This plat is subject to the Tree Preservation Plan dated „ 6t ;.2O 0 .; ^ : `' 2610. 39 ' 2- 19-2009 August 12, 2015 and recorded under, Z2 1 � . it ,m ; 652. 60 ' 652, 60 State of Washington iomN�*` -Imp "' i D - � County of Skagit AFN � � 0 ' UoCCJZ� 0 - :..: 5 `' " . S q N I certify that I know of have satisfactory evi en, that rC�('!GI 2re�. iltrlol �* ,;, q O signed this instrument, on oath stated that she/) a /are) authorized to execute the pp" in "' g V1Le 4 rPs; 8erTf 3 . The PUD reference number PUD-2015-0003 and date bf :-'- � - - �y � (p S 88'39 46 ' ,� � � p instrument and acknowledged it as the of approval shall be included in all deeds and contracts . Z SKAGIT STATE BANK to be the free and PP = 655. 36 655. 36 ' W � voluntary act of such party for the uses and purposes mentioned in the instrument. G ` LOT 2 -. � � ' p Given under my hand and official seal this Z� day of April 20n 4. View Protection Covenant under Auditor's_;:.'' ' ;, ` It ` - _1. �- ` r�� �o cp N Notary Public in and for the State of Washington File No. I;pmmip. >tl rt SITE P \. WE 1 p. O N P � Name printed t° (' t nr, L_ L.l�li i �/QP 0 V WEC(� To berecardeof of Loki 4 >' C . - - - ppm o / (p of L` Residing at � Y� 0. L� riGS tt�A , �2' Ssw" Xp �9%= tn;mo � � to cp Q ? . a N . Imp _ =pnpp� IT, a 2j 504, 12 ' 658. 13 ' I My commissions expires Ll/f / 2Dla = 4 :o �ocA�c .. o= ImpII fpp.mIto4 Puec` - c mom,. petif,= S 88059 ' 17" E , 81214 ' �' c, :Nr •. , � Imp _ 11 IL Imp , i 1316. 26 ' S 88'S9 17 " E of w P ,. q . Zip _ - ;� 1 / 1 STH A m IER ao CORNER d v. oF WAsy �t� SURVEYJR' CERTr11TE' :;,, - a; o o:g I hat ' by ceaify . that the 4 Nlarth PFbt & PUD is based upon of N Lo ari`;Im.,, nd subd 3isi�in performed by me or under my ^ h FND MONUMENT INQ W. M .; `'�he ":;>lat " aLon 22;;€To. itship 35 North , Range 1 East, CASE WITH COVER \22�su exwsl�n ar, S ._>, •`ac sur ear:: tt�se 'ancf'' correct representation of the landp ee�- CALCULATED CORNER 2- 19 -2009tually;,_ y thGt;. "' courses and distances are shown c � O: :cP imporree#1n a ground ; and that I have complied with the 132727 ' (� 1327. 27 ' 23 OWNER/DEVELOPER LAND SURVEYOR It ` rdvasions Of fipe It III I b statutes and platting regulations and that 1101 Pp.pLumonl ft . contd l monuments have been established at each 48 NORTH ON FIDALGO ISLAND LLC DALE HERRIGSTAD PLS G` �Z4 .ZQ � � nt� ;. every c�ria�frolling comer of the parcel of land being S 89 '37 '49 " E 2654. 53 ' 27 26 PO BOX 319 4320 WHISTLE LAKE ROAD - ba {ided . t1l , 1 ,it SECTION 2 2 TOWNSHIP ANACORTES, WA 98221 ANACORTES , WA 98221 SHEET 9 of 3 k.i'-: DALE" K. HERRIGSTAD , P. LS. Certificatne No . 27807 35N , RANGE 1 EAST , W . M . PUD - 2015 - 0003 PW 16 - 005 - DEV _ Date A P % 1 L L I 1017 DWN BY: DKH HERRIGSTAD ENGINEERING & SURVEYING SCALE: NOTED S C ' ` ` E NONE DATE APRIL 2017 4320 Whistle Lake Road , Anacortes , WA 98221 (360) 299 - 8804 JOB 2015 - 53 48 NORTH PLAT & PUD 201 ; 5� 0: 0028 SECTION 22 , TOWNSHIP 35 NORTH , RANGE 1 EAST , W . Me Skagit ii? Audib3t. 6,40 0 CITY OF ANACORTES , WASHINGTON 51212Q 7 " Z °t ,- 311 :40AM -41 EASEMENT NOTE LOT /I� I LOT /3 � k .-__ ?' = . P31583 SHORT PLATANA-98-002 I P31682 � :.. t 'J '' AF #9806220012 - " ATqj PSE EASEMENTS UNDER CURVE TABLE: ' ;. }' . T ._ . ' Is As AUDITORS FILE NUMBERS / 1 N 88 39 46 W 316,28 ;i-' ^l_ 201607050142 & o i Q 35231 75,12' 75,59' 201612060089 . �v�� / �P p� t� 20' SETBACK - 2 - - - 2 -133IfIs _34' _ NUMBER RADIUS ARC LENGTH DELTA ANGL " ""NUMBtwI `'= tADT - 7ARC LENGTH DELTA ANGLE S lo' SETBACK Cl 670.00 83.10' 7.06'23`.1. "::;:. Cw 80,00' : 1. „ :: 30:43' 21'47132' �� in 10 PRIVATE 3 30' SETBACK 4 ' dKil. lti . 'x' C2 67:50' 165.72' 140°40. ' 2; '' 9. i._ ` 5.15' 3.16'S4' "_ . �. �P �` pS htia ti j SD ESMT d. Ins­I Z 3 3 10 ,690 SF I C3 57.5O' 89,13' 88'416.!41',_ ,;,L. } £�Cc bb �_; ' 0,) 52,06' 33*08126' v � �� /0 2 Cu 7861 SF v C4 57,50' 90,09' 89'46 ;l' ` t,,, `'1-.k �3pr..,;•' ;�€f00 29,15' 18*331350 � c, 0 / � s 8007 SF " 40g :m 0 10 I C5 67,50' 64077'; 'T ` 4'S8' S' %` :. " , C 1 647,50' 39.20' 3°28'07' � o a / �• N 88.39'46' W C6 670,00' 83.10' "_ ',T..7t? 41? - ` .. C3 `_dc' 20400 10,06' 28°48 20' < �' c/ % �'i 406 ti ~ _ e, t 10' PRIVATE A6 J: 10' PUBLIC 3 11228' C7 687.5O' WA7' 1��D5'�4' ` , `Ty''.,. `i'�33 20A0' 22,64' 64°50'58' SS ESMT ' F i _ UTILITY ESMT C8 687.50' ,6 .<<., ya:_3' �24.'. c`` C34 20,00' 26,36' 75°31'21' 1 � 0 5 ' C35 20.00, 6,33' 18*07156' 7755 SF/ e�5 cis 1 �* 8092 SF I c9 so,oa` 1276FoO , ;,-:, r. C10 40:,9fT . , bedU '.. 8$;{ . 8 #� C36 647,50' 39,01' 3*27'068 0 .; rrt ^ LG cy�P� fo s ns�i\ 9��i. ®�ec�/ c \QG,� _ c/3 \ 414 I C11 40oW, 62.67 Ni '::e;_89* 46.1-i C37 522,50' 69,8b' 7'39'39' R � \ A \ * r \ �� / G C12 . ; :- _.,: O.00it;• is 18,11' ?,, '7!:20'45'O8' C38 522.50' 20.00' 2°11'35' Q� 1 E G C9j r• \ " o- s/ GF C2 \� N 8T4T58' I W C Its, _. 5I130' '? L GS �� � g ��r ?G �'� \ F i°j6 o\ y_i, =:2. 9,87 34'13'48' C39 522,50 125,40' 13'00'15' � 1 NAP yp2 4 C p s \ / r , C9 \ �\ 86.60' 404. ?"' ' "30,00' 4 " 22'24'S3' C40 552,50' 80,82 8.22154' �GJ� �yg2a' r ` Q 5p9 e2 s ���' �'�� 34 / � o Cl 90,00' 133. -` QQQ'•-�" 19'06'DO' C41 552.50' 44:58' 4°37121' /oy �' Row 17.5 ' SETBACK _> 6 m '•':Cl 90,0t ., 65,57' 41°44'31' C42 670,00' 34,52' 2°57'07' SAP y \ D�opO C1 R0 \\ � } 7682 SF I ::,:.�y. : ,. 17 'Ik, 90,00` �' 30,00' 19'06'00' vP 5, 1 �,., 3 0 I •;. t �,,. ,, CIS. `+�;;;._, 9Q9Q' 4` 30.16' 19*12,000 LINE TABLE 22 '' 8155 SF I 41 = ' ,, 19''%y„ �J0,4(} ''' 30,02' 19.06136' NUMBER BEARING DISTANCE "' I 29A� �� s 7558 SF M I Im N h �I L0 -''BlftlO' 39.50' 28'IT2T rya ya j\�P r fir 0 �Bc�� c L cy�P/ / � I s o 1417 I I� N 87.4715 • ~ ' Li N 29°29'13' E 17s321s20' 0 22.50' -I / NO LEGAL FOUND 6 20 21 0 ®/v �� �� / I " i� 7.so ROW loo,00F . : Cal 80.00' 33.75' 24 10 07' L2 N 29'29'13' E 17,30' 'er s a s � �� k s ea•s9'v' E ow I , ,x ,: -. :,,, _ C -2 80,00 34,21' 24°30'00' L3 N 34°4617' E 34,11' N I 8129 SF F i 2250' PCs `'' I ll3,37" I { r'' 3 80,00, 16,55' 11*51116' L4 N 60°33'11' W 20,02' I / ROW /C] FS 9!I c 10' PRIVATE 4i' . :_ u. ' :. ` 608 I I 51 '',�c "" 't _a- C24 80.00, 23,74' 17°00'00' L5 N 39°30'43' E 22,2T / 5 F c � 7.50' �r SS a SD ESMT I '{;; � 'o C25 80,00' 30A2' 21'30'00' 10' PUBLIC / R0 / ti 1 I I Cu �V 7500 °�� F �°w.: L6 N 39630143' E 22,22' I 1,UTILITY �SMT / �q7 i 'TRACT Cz i1 29 I I ^ ,. I ®j I ' ^ C26 80A0' 41,16' 29.28139' L7 S 88.591170 E 40,64' 1 I �'� . / /� / / / 6552 SF I 7936 SF I I _ I. {z L8 S 54°30'43' W 16:82' of 7l � 1✓ � ! ���/ S B8.59'1T E I S 88591T E I I ; L _N4' ip� � �' NOTES P56562 . rD 1 . SET CONCRETE MON WITH BRASS CAP IN CASE WITH COVER. vil I n �/ 116,27 I 113.37'.:='"� m 1 I ^ I 2 � 606 " 10' PUBLIC I I NI v'Y'' ' " ri 2. � SET RE-BAR AND RED CAP PLS. #27817, 7500 SF I I " 1 I I Uto TILITY 23 I I 1: �' L•, I _ I 8 I 3. 0 FOUND IXIsrING REBAR AND CAP MARKED PLs #9569 OR AS NOTED. 5 I ^ I ESMT o 28 F,1 �. " N :1 a VISITED 1 -4-2017. 10' PRIVATE ' �" 8287 SF I .1�1 � .: �I 7500 SF SS S S➢ • ESMT I I vil I I _ ` ., SF �� '� I `� ^ I I n w 4. EQUIPMENT USED: CARLSON CR2 2" TOTAL STATION. _ n --=. 605 �, I - 1 20 5. ALL CONCRETE MONUMENTS WERE VISITED ON 2- 1 -2017. `'`.;y_ ' • N 6. ERROR OF CLOSURE MEETS WASHINGTON STATE SURVEY STANDARDS. ` 1 I o 7. SURVEY METHOD: STANDARD FIELD TRAVERSE. o l >>c'pP I✓ I u, S 86'S9'17' E ',S 'SYYI_ E ` ""z =:r."sl N 87°47 SB' W 8. BASIS OF BEARINGS: Record of Survey, AF 200104030063, I 13 ti 117.78' J'' t33i" _ - 100,00' 19 Is o ' a 1' � 10' PUBLIC I 9 .DADDRESSES SHOWN ON PLAT. I I I iyF al UTILITY ESMT z 10. SEE SHEET 3, PUD AND PLAT CONDITIONS #2 FOR BUILDING SETBACK O m7500 m 24r' r } o • : la :, I' 4x ,. I IN ^I m 9 I REQUIREMENTS. VI I g l D hY 'd;:�'sIlb o 'j. -1 W �O 5 4 w b 818 '" S.r. • . ra ^ .w to � a © I - � 1 �� � � -' ,9i F ^ I 7500 SF I 11 I I 02 I ^ I I ,. s ee?59'I�' E I ' . `ae•s9'm E i I ® OFFSET PROPERTY CORNER NOTES Z ¢ I I m ���' I ROW ROW = 1 N 87.47'S8' IW 16A ;�° 113.37' 1 REBAR & CAP SET 1 .00' S 32.20158" W OF oyy O m I m Ii4, J ` 0 100,00' Q f- ' z '- _• icy 1, I I m I I TRUE CORNER DUE TO FENCE. M � � 18 I : .: .. T �, II 26 ILA o st o l ''-3 A r f =' Cu I r� " I '� 10 ® REBAR & CAP SET 1 .00' S 1 '20' 14" W OF ~ I �781 SF I~ _;•o' `' I 2 Sf.,: ..,a. N o m o Ra, 1: m inCu 8175 SF � D 7518 SF I o TRUE CORNER DUE TO FENCE. 602 �- ~':1. °' " ^ iu I 505 REBAR & CAP SET 0.75' N 100*430 E OF I I Jti 1° t. ' y •< , \ � 2d S21 ACK _ Z 5 � / oI � ® In TRUE CORNER DUE TO FENCE. is ? _ _ _ �_ L.10' SETBACK_ i p1 v! ® REBAR & CAP SET 0.50' N 13'21 '22" W OF N 88'S9'17;-' ! 1a 74.35' 74.19' ! TRUE CORNER DUE TO FENCE. 92d8T aGj. :.., n,, �4 C3/ N 87°4T58' W I y� ® REBAR & CAP SET 1 .00' S 62'2T00" E OF .., w "' FND REBAR & _ xa '� = LATITUDE CIRCLE �� / Qv 109,56' I TRUE CORNER DUE TO FENCE, PRIVffyATE 20' SHARD C.s S do _ �ti� co 6 REBAR & CAP SET 1 .00' N 58'29'41 " E OF / CAP HERRIGSTAD UP - � �3`; °' N 88'59'17' W 148.54' �% _ x Az. h}T AF 2 7240@y6 . , a. L �o _ TRUE CORNER DUE TO FENCE. frr " "' \ � 4 G�i \ 1� S� 8054 SFI 47 ® REBAR & CAP SET 1 .00' S 2012002 ' W OF ssq_' Is �'y ip L ,. � � _ _ 34_18' 1 _ 80,00' _ _ _ 29.36' C_2 L co� a '� 1506 I ^ CORNER DUE TO WATER METER BOX, ^< <^ " IF-SET I FUBLIC - - \ ��- �' Q 17 y'=t, rn UTILITY ESMT � : . :r � ,, 1 , . .. V 16 15 y 14 13 6� F\ N 87.47'58' w P5" 7 s ' ;,_ $-.11 ; " o N N 7617 SF �'� �yT� � 94sP OWNER/DEVELOPER LAND SURVEYOR >;._:., ;_ 0 8092 SF c N 7930 SF . N 8000 SF o N I � "� -'"�1 `'= `J °'' _ ~ N "' `= N `= 512 � 1 w 12 GRAPHIC SCALE 48 NORTH ON FIDALGO ISLAND LLC DALE HERRIGSTAD PLS 7�111 -=:M�•::_:-: ''' 518 516 514 w w I '`'= '"" f ` -In rn - �30' SETBACK - - - - - - - NI' ,,I3 8849 SFj � 25 0 25 50 100 PO BOX 319 4320 WHISTLE LAKE ROAD % iiiiiiiiiiiiiO Itsr;' 3Lb � 510� ( IN FEET ) ANACORTES , WA 98221 ANACORTES , WA 98221 -F, .y Y.+_ •'At „Is _•aryl••iM ,. 75.00' 4 80.00' o 10' WA ESMT 1 inch = 50 ft. 89.08' 80.00' 76.06' 103.98' 34.0' TPOB SHEET 2 OF 3 is. Yn , 1 /16TH 3 S 88°591T E 504.12' CORNER ' - NO STRUCTURE ON LOT 15 SHALL BE CLEARIDGE DIV. II I 7AT } 7 ,d: . k P82597 P82596 TAMER THAN 25' AF #8204220013 P U D � 2 0 JL 5 � 0 0 0 3 P T 16 � 0 0 5 - D E V - .,,,;,., ' FROM THE NE / P82593 ! CORNER. P82595 P82594 ! DWN BY: DI<H HERRIGSTAD ENGINEERING & SURVEYING SCALE: NOTED iDATE: APRIL 2017 4320 Whistle Lake Road , Anacortes , WA 98221 (360) 299-8804 JOB 2015-53 i 48 NORTH PLAT & PUD ai: D ; ;4�ons�r!ini SECTION 22 , TOWNSHIP 35 NORTH , RANGE 1 EAST , W. M" Skagit or.untrvr at $16e.oD C �1T OF ANACORTES , WASHINGTON $o+ ''page y 3h. 3 , , : 40AM L" PUD AND PLAT CONDITIONS -'' '=_ it 't•• ? i '' LEGAL DESCRIPTION `' = aB NORTH PLAT & PUD UTILITY and ACCESS EASEMENTS & DEDICATIONS , .� ` ' t. PUD-2015-0003 " ,. "`' 1 . An easement is hereby reserved for and conveyed to the CITY OF ANACORTES, That portion of the South 1 /2 o,(AAe kdi teeast 1 A . the SoOtF�git •.1414, of Section 22, Township PUGET SOUND ENERGY INC.(A.F, NO. 201607050142 & 201612060089), FRONTIER 35 North, Range I East, W.M.,,to;c ;, BDuthea xly of fete "BiJRROWS BAY ROAD', EXCEPT the "COPPER All parcels within the subdivision are subject to the "Findings of Fact and COMMUNICATIONS TELEPHONE COMPANY, CASCADE NATURAL GAS COMPANY, AND MINE ROAD" along the East"ail a 4tiereof, _ANb' Fwoo. tY,;.f .:ZAw in described tracts: Conclusion of Law" as adopted by the Anacortes City Council on the 21 st COMCAST CABLE TELEVISION COMPANY and their respective successors and .Jffi =Ott ;.Y __ is iti. ,r day of March, a face The following Conditions were required to be assigns under and upon the front ten (10) feet, or as shown on the plat, of a.) Beginning at ;_ l•�"`�Sa`ulbeast `%omen cat SouttasS"N of'the Northeast 1 /4 of the Southeast 1 /4 identified on the face of the Plat. front boundary lines all lots, tracts and spaces within the plot lying parallel with of said Section; j` ' ;, ''s , - _,r. tb and adjoining all public street(s), as shown on the plat, in which to construct, thence North 88'5146E��desf`t long %ke Si hoffll uPl 'said South X of the Northeast 1/4 of the 1 . (FF # 10) The lots in this subdivision are subject to applicable water, operate, maintain, repair, replace and enlarge underground pipes, conduits. Southegsi`��4, 30.4, feA ato the West_;line ofc-t1Se 'COPPER MINE ROAD'; sewer, and stormwater general facility and hookup fees and transportation, cables and wires all necessary or convenient underground or ground mounted fire, and park impact fees. These fees are payable at levels in effect at a urtenances thereto for the themm caglinuf,NortfiL88t359f46" test 78 <;8 feet the time of buildingpermit issuance and may differ from those fee levels PP purpose of serving this subdivision and other , ,hence' Nor�r,�'1f`2$rEasti.68f,34'` teet to the North line of the Southwest 1/4 of the Northeast P Y property with electric, gas, telephone and other utility service, together with the 1 `:_�} of'', SoAtlieast 4 are Ftte true point of beginning of this description, said point being currently in effect; sewer and water latecomer charges may be payable. right to enter upon the streets, lots, tracts and spaces at all times for the ±. T ; +: purposes herein stated. ;the NorthwFOt deer %af that ;certam tract conveyed to the Port of Anacortes, a municipal na 2. (FF # 11 ) ZONING INFORMATION: It.. .por"ti.{ion, N,it 1 reCuelvfl' July 22, 1968, under Auditor's File No. 716164; Underlying Zone: Residential District (R2) 2. A 10 foot private storm drainage easement across the North boundary of`& "tnto , IN a term sar`�4: trfrrpoint of beginning run South 2'11 '29' West along the West line of said Part Zone's Minimum Lot Size: 7,500 Square Feet Lots 2, 3 and Tract B as shown on the plat is hereby reserved for andl. of Aw kort track _p°distance of 15 feet; Gross Acreage: 7 .48 Acres (included 1 /2 abutting ROW) conveyed to Lots 2, 3 & 4 for storm drainage to service lots 2, 3 & ,A ns - thence . parallel with the North line of said Southwest 1/4 of the Northeast 1 /4 of the Net Acreage: 7.20 Acres which to construct, operate, maintain, repair, replace and enlarge u�fergrgundi • Tr'v, Southeast A 4 to the Easterly line of the "BURROWS BAY ROAD'; Zone's Maximum Density: 4 Dwelling Units (DU) per Gross Acre pipes, thereto for the purpose of serving the lots herein. The miiFhte.Ince'O%b f+u�nte'N4ithedy along said Easterly line to the North line of said Southwest 1 /4 of the Northeast Density Calculation: 4 DU 7,48 Acres = 29,92, rounded to 30 DU the improvements to the easement will be the responsibility of and g#iared by J1 4 :a to a Southeast 1 /4; Proposed Lots: 30 Lots + 1 Commune Park the benefiting lots. € !r Ar,: s " -t / P tY 7 Pence East along said North line to the true point of beginning. SETBACKS: 3. A 10 foot private sanitary sewer easement across : ftetthwGst fSa�1.undary off' l b.) Beginning at the Southeast comer of the South 1 /2 of the Northeast 1/4 of the Southeast 1 /4; Front Yard: Lot 1 and Tract B as shown on the plat is hereby, w So M. d feel` an"t cotkt«yed :.... For lots 3- 17 only, the front setback is 10 feet for the residence & 20 to Lot 2 for sanitary sewer pipes to service lot 2 yin. C' No tegy, cde>st A. Wit,A . `"' FLI. thence North 8B59'46' West along the South line of said subdivision 30.00 feet to the West line of feet for garages. operate, maintain, repair, replace and enlarge underground pipes , foF.g:. the^ rppsti'~ the 'COPPER MINE ROAD', and the true point of beginning; All other lots must meet the 20 foot front yard setback for the R2 Zone. of serving lot 2. The maintenance of the impra" entents to the-i asgment will be thence continue North BT59'46" West 781 ,88 feet; the responsibility of lot 2. - thence North T11 '29" East 669.34 feet to the North line of said subdivision; Rear Yard: .,;eW;;=z:,. , `: , .- thence South 88'40'23" East along the North line of said subdivision 760.00 feet to the West line of For lots 3- 17 only, the rear setback is increased from 20 feet to 30 4. A 10 foot private sanitary sewQv``&• .-stgmr! 4" 1[a kt4ge`._:"nsemg� t#�ross the the 'COPPER MINE ROAD"; feet. West boundary of Lots 27, 28, �8 ' BG: I'll `;Ow a `;sho n _ tFiA°" ,fat ,Fts hereby thence South O'1B'59" West along said road a distance of 664.96 feet to the true point of All other lots must meet the 20 foot rear yard setback for the R2 Zone. reserved for and conveyed to fybts a6 , 27, 21 2 ,. & ftay,>:11 sishitary sewer & beginning. storm drainage pipes to service `t�ts'r26, 270 2% 24 & 30 in which to Side Yard: construct, operate, maintain, repairs rftlace and 11ienarge underground pipes for Situate in the City of Anacortes, County of Skagit, State of Washington. All lots shall meet the R2 side yard setback requirements for the R2 the purpose of serving the lots hei%in. 'yiiThe mtiintonance of the improvements Zone. to the easement will be the respone il siti-b.p ik#fid_r Acred by the benefiting lots. 3. (FF # 15) A homeowner's association shall be established and be 5. A 10 foqt-::,grivate sanitary sewer & 'Vorrnmo- drainage easement across the West bound � Lots 18, 19, 20, 21 &''!€Tact A as shown on the plat is responsible for the maintenance of the unity ark Swale (Tract A), y y ry IMPERVIOUS COVERAGE LIMITATIONS hereby reserv8 1 r, and conveyed to Lots 17, 18, 19, 20 & 21 for sanity landscaping buffer (Tract B) and community park (Tract C) . sewer & storrri`;; 11rahage pipes rtr� service lots 17, 18, 19, 20 & 21 in which to cocas? ict, operatLb, intain„, re &r re lace and enter a under round Based on the storm water design for the plat the total impervious coverage for each lot is 48%. 4. (FF # 19) Pursuant to AMC 16.50 . 120 (D), the applicant shall record e , u �" . , e of sei5rin4•"_.- h . -tot , PliereinP The maintenance of the improvements notice with the Skagit Count Auditors Office which � ppqg` g'$ "� P 9 y provides a public ta. tk1 ;,teas'icilent witk,.be` tihe :7esponsibility of and shared by the benefiting lots. record of any approved tree preservation plan and conservation areas; the _oc' . . application of this title to the property; and that limitations on actions ,,?1*tT 6. L, A 20 TDaot e. facet public water main easement on and across Lots 12 or affecting the property may exist. See recording number on sheet 4 _ 13 'ps 1sM*n.�rkZ plot is hereby reserved for and conveyed to the City of " •: '' it, Ana ~orfesifi` whicYrf to construct, operate, maintain , repair, replace and enlarge 5. (FF #20) This Subdivision is subject to the Tree Preservatisrl "isfi5fi :,, _ undeTgro;Ynd pipes for the purpose, of serving this subdivision and other property Dated August 12, 2015. Retained Trees shall be maintainerk `by _ ,.Igi ''' v 'With Patel service, together with the right to enter upon the streets, lots, tracts owners, unless approved for removal by the City of Anocor,�ess' `a- ar4d s�oaA at all times for the purposes herein stated. U. 6. (FF #21 ) The maximum permitted height for Lot:. 15 *ali� be restrictedz..OE �:, ,` An access and utility easement on and across Lot 17 is described in to twenty-five (25) feet from the high point of the popefiy U existing Auditor's File No. 201702240096. `_ ;?'grade. iP. -:y =-1.. " _- T. - , ` <Awo . :,.:.._? on, 8. Tract A is hereby dedicated to the City of Anocortes as a storm drainage 7. (FF Modifications) Lot coverage is m6dified"from ' h? ' Z�anin ' O strict 4 conveyance and water quality treatment facility. Tract A will be maintained by VC A maximum of thirty-five (35) percent,;;tr q;rmaximum of'`= hi seven and the 48 North Home Owners Association and the City of Anacortes. The 48 f1' 'ei;, North Home Owners Association maintenance and upkeep requirements are one half (37.5%) . �_ �., yy; P P q identified in the recorded Declaration of Covenants, Conditions, & Restrictions. y ;es '' See Note # 1 on sheet 1 of 3. Ali other maintenance and upkeep is the "f .*` responsibility of the City of Anocortes- ,.. .to ..:r�' _ - '4u, 9. Tract B is hereby dedicated to the 48 North Homeowners Association for the purposes of landscaping and landscape maintenance. ONO :u. - Tow " , , 10. Tract C is hereby dedicated to the 48 North Homeowners Association for the ?'' ' -- ~'"i'•,_t purposes of a Community Park to be maintained by the Homeowners Association. [11{' Rt 11 , All common retaining walls will be the responsibility and owned by the 48 'OF Sy. .. North Homeowners Association. A 5 foot wide easement across Tract C and Lot if'k ;- " 30 for the length of the wall as shown on the plat map is granted to theot Tor " . . Homeowners Association for upkeep as identified in the recorded Declaration of Ctoo. ovenants, Conditions, & Restrictions. See Note # 1 on sheet 1 of 3. a xveo ` i ' OWNER/DEVELOPER LAND SURVEYORLA CY : Fill wow : '= 2 ER .11+� G4 . 4 48 NORTH ON FIDALGO ISLAND LLC DALE HERRIGSTAD PLS PO BOX 319 4320 WHISTLE LAKE ROAD r.;,. 4 ANACORTES, WA 98221 ANACORTES, WA 98221 SHEET 3 OF 3 f PUD - 2015 - 0003 PW # 16tttttttt005ttttttttIDEV i - OWN BY: DKH HERRIGSTAD ENGINEERING & SURVEYING SCALE: NOTED DAT E: APRIL 2017 4320 - Whis Whistle Like R��� , An�c� rtes, WA � 5221 (360) 2� ! -dE04 J�� 2� 15 53 LOT 26 I / j I I L 1 LOT 10 I LANDED GENTRY co P / HOMES AND C O 11 71 U N 1 T 1 C 5 / I ^� GENERAL NOTES I CONCRETE O�/ CURB 8 GUTTER / �'/ I (� ® 0 LANDED GENTRY BURLINGTON, WA 504 E. FAIRHAVEN JCONCRETE BACK OF SIDEWALK I BMPC233: SILT FENCE 98233 , v SIDEWALK T FENCING TO PROTECT CT /tip Q 1—(360)- 755-9021 V / ! DOWNSSTRE°A dRDTEcr I :/ � BUILDING: INLET PROTECTION / PROPERTIES / . LOWER LEVEL AREA— 827 SF PER C220, BLOCK & "&� O P A A— 1 F GRAVEL FILTER I - - TOTAL NNG REA— 2,936 F / TYPE _ _16. 65' — 10 .56' —' '"I � GARAGE/SHOP — 10003 SF / 49,00' a" �'J /� SITE PROPOSRAIN LIE E220SXIST / ` - !� TYPICAL 40 PVC DRAIN LINE FJOST / 4J, 91 ' GRADE / 219.9 ZONING, RMP C105: STABILIZED x�x x EXIST / CONSTRUCTION " "'T�"—x� �x�x�x�x�x.�x�.x x�x.�x�x�x�x�z GRADE R2 — RESIDENTIAL LOW DINSITY ENTRANCE 220.77 i ' Y � ' , —�x�x�x SETBACKS: / (SIZE TO FIT) BOW qqp ♦ � , �x'�x� �x�x x�x�x ALL SETBACKS IN COMPLIANCE Zoo 1y Ol pq4/N % � a, / o PROPOSED 4' SCH —x C2o7CCH DAK DAM PERMS P x�x W1hl CITY GUIDLINES ""++�x SIDEYARDS MIN 5; 15' COMBINED 'Y� R' �' � ♦ N 40 PVC DRAIN LINE AS NEEDED. i LOTLINEB V4 P, , / � � ' , R0O I--- f0.29' 19. 46' 15.25' $ N LOT LINE REAR FRONTYARD YARDMMIN f0; 20' GARAGE RIGHT-0F•WAY LINE Q. _ F I � l� ♦ DOWNSPOUT _�_ C�5 - - - - - - - - DOWNSPOUT _ _ HEIGHT. - - - - DOW� - - - - - � - - - � - - - � - - " j ALLOWED: 35' 'I EXIST. SANITARY ED. UNDER �• ? , / _" % PROPOSED: SEWER LINE D ' f A OVERHANG I o W JJ PARKING: /9 ' O ABOVE 2 IN GARAGE 2 IN DRIVEWAY 5 GLEPN�t liy� W cyi � . . . s OIT INNEC ON I � � LOT COVERAGE ♦Cj�O j� OPgN I SS� O DRIVEWAY Ot Cp` (LOT BJ �'� Y'7jG7}. � / $ I � Ion o I N BUILDING AREA: \3Y O�1.lsto . .ItCNBPg�a (Lot ' S , ` / / �'t N o � 221 .10 GFF GARAGE / SHOP I � 2 2,291 S.F. G 02�0 Y�Will0 ♦ o 9 LOT AREA: FF�N%,l (Lot 12) ♦ DRAIN / N I 2m 8, 054 SF. ♦ / ♦ / EXIST. SD PLACE CONSTRUCTION FENCING PERCENT COVERAGE:CONNECTION P5♦ AROUND EXISTING TREE AT DRIP 21291 / 8,054 = 28.5x / �(LOT 11) ` �� I LINE PLUS BI(TYPICAL). BoC233: SILT FENCE MAXIMUM ALLOWED: 37.S,L / \ rB �E OF 2193 '\ ♦ `�%O ` ' 221 .40 GFF j"��w—�x�x�x RTOCK PILE EAM SIDE OF ,orEXIST/ ` �� �" IMPERVIOUS COVERAGE GRADE \ / � �gYd''v i I SOIL STOCKPILE LOCATor INLET PROTECTION a� ` I BUILDING: 1,9J5 S.F. i� GRAVEL ♦ ' LANDING .p , I BMPC123: PLASTIC COVERING , ` STEPS ALKWAY.• 57 SF. ,GRAVEL FILTERioor ♦ ` fin, 20 221.90 FF i C \ /W - TYPE i ♦ , o'�'p d' PORCH p OVER T PLASTIC R T RM PORCH: 96 SF. EXISTING i \\ FOB, ` I EVENTSANDWHENNOTBEING \ PA TIC: 284 S.F. STORMDRAIN � i � \\ ♦♦ . '9'y�,y LOT 11 '0 I � `EDFORMORETHANTWODAYS \ •op L. 617 F LINE (TYPICA4) i \ ♦ ' I - _ -- - ---�/ ydy ' .LOT AREA: \ ♦ �Oa EAST JO' REAR yARO 7,682 S.F. ♦ ' `j}.. \\ ♦ -df• vY1oVd�t� BUILDING SETBACK LINE30.00' / \ ♦ �Fq Y(J 05�oEY PERCENT COVERAGE.' 'Pc ? O'`Q1pst Pao I Z989 / 8,054 = J7. 1A No �2 PROPOSED 4' DIA. SANITARYSEWER jl t bo I MAXIMUM ALLOWED, 4B. OA PLACE CONSTRUCTION FENCING \ ♦ ro COVERED AROUND EXISTING TREE AT DRIP i7. LINE PLUS 6(TYPICAL). \\ �- oro ♦♦ ,� g I aw PATIO \ \ NCS �\ to \ ♦ '' I J / C LOT LINE & PLAT BOUNDARY = \ I� a \\ y► Coo ♦ - - bl ( No aNIONNUMMENIM I 2 l ^� m LOT 13 } \\ g GRAPHIC SCALE \ Vi to 5.00' J4. 00' I / � - -, J 10.00' e 6 O 3 6 12 PROPOSED 4• SCH \ rc OVERHANG --{—= No ABOVE ON 40 PVC DRAIN LINE �" u1 �/ Erosion Control Notes for Residential Constructlun - City of \ i ad 223:6- - _ Anacories \ - EXIST— _ ( IN FEET \ ` _ i GRADE Horia. Scala: I Iv1.ch = 6 Feet A. Erosion Control Best Management Practices shall be in place per the EXIST \ LOT LINE _ �/ �\ accepted site plan prior to any construction start GRADE f1e0• 48 NORTH B. The erosion control shall be inspected once aday and modified to \- - - - - _ _ 49. 00' �_ \ Moo _ 43,91 ' CAMPBELL (PLUS 4') meet the surrounding conditions as needed. � - /" -. C. The storm drain system mallbecleaned doily (Section the City NI CHECK DAM PER BMP � 94,50' r —7 2-CAR GARAGE LEFT drainage systems shell be cleaned to the acceptance of the City o I AS N CHECK DAMS, BMP C103: HIGH VISIBILITY At acaries prior toconstruction acceptance a ma project. I AS NEEDED.D. Stabilized consWction entrances and roads shall be Installed at the ) TDAEOOCEAISK OF PUBLIC beginning of construction and maintained during the duration of the I ENTRY INTO CONSTRUCTION I EROSION CONTROL PLAN project. Additional measures may be required such as wash pads to I SITE ensure that all paved areas are kept dean. No mud Is allowed to LOT 11 (P133669) enter onto City streets. E. Any soils exposed that will not be disturbed for two (2) days dudng the wet season or seven (7) days in the dry season shall be Immediately I I I 1506 LATITUDE CIRCLE stabilized with the approved ESC methods (seeding, mulching, plastic I I covering, etc.) I ) LOT 1Z I ANACORTES, WA F. Two (2) weeks prior to the beginning of the wet season (October 1). or all disturbed areas shall be reviewed to Identify which was can be I seeded In preparation for the winter rains. Disturbed areas shall be ' seeded within one (1 ) week of the beginning of the wet season. A sketch map of those areas to be seeded and those areas to remain JOB NO: PLAT OF "48 NORTH" uncovered shall be Submitted to the Project Manager. The Project ABBREVIATED LEGAL DESCRIPTION: I DESIGNED: LG Manager can require seeding in addllional areas In order to protect surface waters, adjacent properties a drainage facilities. LOT if, 48 NORTH PLAT k PUD, SECTION 22, TOWNSHIP 35 DRAWN: G. Penalties for an Erosion Control Wolallon are subject to a $300m NORTH, RANGE 1 EAST, W.M., CITY OF ANACORTES, SKAGIT I DATE: 02/09/2017 $1000 fine under Chapter 17.66 - Penalties for Violation. Each day Is COUNTY, STATE OF WASHINGTON, considered a different violation. I SHEET 1 of 2 LANDED GENTRY 11ONICS AND COMMUNITIES 4 ® 'ivy N ` t5t 13th St t Lovrics Sea-Craft0 oaµe,.Me - - - 1 .I1h StLm n Slh S1 10 �; - lulu ,: - ➢ IE,11 �1 Shannon f null 17111 g!- 'I ,l \J .typ ` I (1111 SI Shannon Point - 0Marine Center O - ' r .20as ylltas` rrhs, c ,N Glast Nr A0 C 11 �o 4 3 a Vl T • . : Je3 Toys 74 _ 0 owesrt:aY SITE LOCATION hoc_ 4pll ' .I = . : Copper Pono Ship Harbor Inn O (J ,paa ,�' Cranberry _ Lako Park Sunset Ave - sunset Ave - - - sunset h`e San Juan Airlines It, ,,, 'nr S a ' p O aWtoat Sr r'oU.� - `u. Anacortes 2011) 1;I Z h Airport atst s, - i aY 5"IDr _ D8 p r,,/a a e^° GRAPHIC SCALE Y Old Salt's Deli & Market @ - 8 0 3 6 12 s . z ANACORTES , WA Skyline Marine Center - cp a 'O� o - ri IN FEET ) � Hoz. Sc¢Le: 1 Irzch = a Feet O oUnaerfiat' m � 4� g�G . • ril qt ._ Skyline Marina 48 NORTH Owners Assoclalionp Y" D' 9w n toe lYay- LOWMAN a,. 2-CAR GARAGE RIGHT Oro icy zGd,, �glE Queen AnnYI EROSION CONTROL PLAN fuvmva Fac< o, aY . � LOT 11 ( P133669) Map data 02017 Google 1000ft1 1506 LATITUDE CIRCLE VICINITY MAP ANACORTES , WA LOT 11 (P133669) 1506 LATITUDE CIRCLE JOB NO: PLAT OF "48NORTH" ANACORTES , WA DESIGNED: LG DRAWN: DATE: 02/09/2018 SHEET 2 Of 2 I _ LOT 26 at LOT 10 I LANDED GENTRY 110ME5 AND CONIMUN IT [ ES ease File GENERAL NOTES ( (♦ , CONCRETE / I . .�..., . OWNER: �I V , Q LANDED GENTRY CURB & GUTTER / / JOI 4 / / ! :�� `~ < BURLINGTON, WAN le, v CONCRETE ` BACK OF SIDEWALK / I 1�Fa Ln 982 0)-755-9021 _Ile ' SIDEWALK '— / BUILDING•. I LOWER LEVEL AREA- 827 SF / � � � � � 0 LLJ ® TOT VI G A E — 2,936 F 1 16. 65• -s —a e gassea .v -R'- GARAGE/SHOP — 1,003 SF PROPOSED40SCH 2209 49.00' SIZE: 1 / 40 PVC GRAIN LINE GRADE 43. 91 ' TYPICAL I / _ EXIS - ZONING: � 22077 r � � GggpE —R2 RESIDENTIAL LOW DINSITY 1 / BOW _ yARO � p © / SETBACKS: ALL SETBACKS IN COMPLIANCE 4j! 04 P} °Qy o p p / �W o PROPOSED4' SCH WITH CITY GUIDUNES "3 � / ♦ N 40 PVC DRAIN LINE SIDEYARDS MIN 5; 15' COMBINED \•f PJ ' ♦ / % ® 4. 002 10.29' - o LOTUNE ems' LOTLINE & \ / 19.46' $ 1n REAR YARD MIN 30' / ® 15.25' N FRONT YARD MIN 10; 20' GARAGE - , RIGHI'4F-WAY LINE / yC ♦ // \ i e_ DOBNSPOUT _ ar _ • / \ I � — �'- � _ :, i = �",.�' ___ -_DOWNSPOUT � 'X ' ' / HEIGHT -./ .j MAX. ALLOWED: 35' EXIST. SANITARY /' ?o• .��_ I ! SEWER LINE y PROPOSED: UNDER 19i�0i' t OVERHANG O W — /] /..� � / �. , - , / ♦ OfNIWT / ABOVE I j l.� 1' Vallee� l G ; _ PARKING` {� 2 IN GARAGE, 2 IN DRIVEWAY SS �SS � COINNE S ON /O• DRIVEWAY I Lu ( J ♦ ♦ ILOrB) F+ nG 8 �_ � I / LOT COVERAGE WM / N 221 .10 GFF GARAGE / SHOP ^ (9 BUILDING AREA: LL IS / N ?W � 0 0 � = 2,29E S.F. f wM'--= Y'w0 GRAIN h o j LOT AREA: ^ ' (Lot 12) /Ji ; / / ✓ h I 2m 8,0545.F. ♦ EXIST. SO ^ I PERCENT COVERAGE., a . / / (CONNECONNECTION 2=% 2,291 / 8,054 = 28. 5E MAXIMUM ALL01�E0: JZ5% / /219.7 /\\` / w C � / 221AOGFF I — saw / GRADE \ ® '`Q IMPERVIOUS COVERAGE / \ � I BUILDING: 1,9J5 S.F. / i ' ® LANDING Y: p , i � PORCH 221.90 FF o 16y ALKWAY.• F, EXISTING i �\ PORCH 96 S STORMDRAIN i ' \\ ® ` - LOT 11 h o PA no: 2B4 SF. o DRIVEWAY' 617 SF- LINE (TYPICA4f ' � \ �, a TOTAL• 2, 617 S.F. y LOT AREA: � � 1 \ �� ® II EAST JO' REAR YARD 7,682 S.F. / / ease / \ ♦ 'rs BUILDING SETBACK LINE30.00' see VIA \ PERCENT COVERAGE.• \ �\ C/F� II I 2,989 / 8, 054 = J7. 1x \\ �� \ PROPOSED 40 DIA, SANITARY SEEWERWER LOWED:MAXIMUM AL 48. Oi ease ! • COVERED I.` I \\VA ` O I z PATIO a ` LOT LINE 8 PLAT BOUNDARY ee"al INli ♦ VIVO" I W cx5 4 I el- i VVV— LOT 13 ` � ti EPS� \\\\ �" °� o - - �a�' m l� \'a aVemsVie J4. 00' � <i GRAPHIC SCALE \ uN \ m 10400' 6 0 3 6 12 OVERHANG PROPOSED4• SCH �� Z \\ ABOVE 40 PVC DRAIN LINE cd \ is IN FEET ) \ Horiz. Sc¢te: 1 Inch = 6 Feet EX13 \ LOT LINEIST - GRADE R80' ads,\ \�\ e 48 NORTH 49,0a�_ zzBs CAMPBELL ( PLUS 4') � —� a'• "e- � e �, <- �, 4S9f • EXIST 1 / 94.50' `l GRADE 2-CAR GARAGE LEFT I LANDSCAPE NOTES: I / I LANDSCAPE PLAN PROVIDE (1) TREE (EXISTING OR ADDED) PER 11000 SQ. FT. OF LOT (8 TRIES i @ LOT 11 ( P133669 ) MIN, as VERIFY LOCATION W/ BUILDER) W/ A MINIMUM 2" CALIPER (PER CODE. I 1506 LATITUDE CIRCLE TREES PROVIDED WILL BE A COMBINATION OF DOGWOOD, ALASKAN CEDAR, LOT 12 I ANACORTES , WA VINE MAPLE 4 WESTERN HEMLOCK (VERIFY LOCATIONS W/ BUILDER). VERIFY Z TREES TO BE REMOVED IN FIELD W/ BLDR. IF APPLICABLE. I JOB NO: PLATOF "48NORTH' DESIGNED: LG PROVIDE LANDSCAPING IN A COMBINATION OF SOD LAWN AND PERENNIAL DRAWN: PLANTING BEDS TO COVER A MINIMUM OF 20% OF THE LOT (1,611 SQ. FT.), DATE: 0 210 9/20 1 7 VERIFY LAYOUT w/ BUILDER. SHEET 1 of 1 / r LOT 26 9` // 9a" LOT 10 r LANDED GENTRY HOMES AND COMMUNITIES Ai r /r GENERAL NOTES OWNER: CONCRETE LANDED GENTRY CURB &GUTTER / 504 E. FAIRHAVEN f / BURLINGTON, WA �(/ CONCRETE BACK OF SIDEWALK / BMP C233: SILT FENCE 98233 (w SIDEWALK FRIMETER SILT 1—(360�-755-9021 / FENCING TO PROTECT / DOWNSTREAM BUILDING: INLET PROTECTION / PROPERTIES LOWER LEVEL AREA 827 SF LEVEL AREA-- Z109 SF PER C220 BLOCK& GRAVEL FILTER TOTAL LIVING AREA— 2,936 SF TYPE �4 16.65' / 10 56' GARAGEISHOP — 1,003 SF PROPOSED 4"SCH 220.9 / 49 00' SiTE: 40 PVC DRAIN LINE EXIST / 43.91' TYPICAL GRADE / 219.9 ZONING: BMP EXIST R2 — RESIDENTIAL LOW DINSITY GRACE CONSTRUCTIONSTAB x®x-�x.x®x7—x�x�.. x®x SETBACKS: CONSTRUCTION x�x®x� 220.77 x HECK AM PER BIMP . ALL SETBACKS IN COMPLIANCE (SIZE TO PENTRANCET) BOW Yy�� �' // x--x�x-� -- CHECK DAM PER BMP x x x�x"x�x WITH CITY GU1DLlNES 1� 0 Qqi� 'r♦ / o . PROPOSED 4"SGH C207:CHECK DAMS, `• �h' ry��P �/� cy 40 PVC DRAIN LINE AS NEEDED. SIDEYARDS MIN 5, 15' COMBINED �!r �a / ♦ 4.00' 10.29 19.46' o LOT LINE REAR YARD MIN 30' i LOT LINE& �� / �► 15,25' ---_ o - FRONT YARD MIN 10; 20 GARAGE RIGHT-OF-WAY LINE Q�J a - � Qp / ♦ DOWNSPOUT � � � DOWNSPOUT "—� — PROPOSED UNDER � HEIGHT. — EXIST. SANITARY � °• � 6� 3`��` � -- MAX. ALLOWED: 35' SEWER LINE l 9 , 9p � 1' to OVERHANG Q PARKING: C, -p O ABOVE Q 2 IN GARAGE, 2 IN DRIVEWAY EXIST SS O Q " " CONNECTION �' DRIVEWAY,,, �; vN vN ss (LOT B�� ��Sc���<r �Lu Lo � LOT CO I/ERA GE p�v0 Cp`A��� I 4i o BUILDING AREA: 0, \N WM / tx , N wm 221.10GFF GARAGEISHOP Ps (Lot 11) I / �'' N ¢ 1 T ? 2,291 S.F. \N NS p S r �•. O o YARD LOT AREA: ER (t GRAIN �;• r `4o M2) / Z 41 8,054 S.F. �^ PLACE CONSTRUCTION FENCING PERCENT COVERAGE.' EXIST.SD AROUND EXISTING TREE AT DRIP 2,291 / 8,054 = 28.5% CONNECTION 2.5% �" LINE PLUS 6''11TYPCCAL). (LOT 11) �— �° BMP C233: SILT FENCE MAXIMUM ALLOWED: 37.5% PENCEIILTFEN�ON i �16� WAL x�x�x DOWN STREAM SIDE OF p / CO � p /� \ d0 c ,:'' 221.40 GFF ix� STOCK PILE IlV/PER �l QUS l� VEl V A GE •s 219,7 411 EXIST. \ / �Q O� r— �• �x �+ GRADE \ i 9-�� SOIL STOCKPILE LOCATON INLET PROTECTION BUILDING: 1,935 S.F. PER C220 BLOCK& �" r s 2 LANDING o I 221.90 FF °��-°+ — BMP C123:PLASTIC COVERING �t S7FPS/WALKWAY 57 S.F. 0 :GRAVEL FILTERS �pG h ro ; PORCH p OVER WITH PLASTIC DURING STORM ' PORCH: 96 S.F. ° TYPE i O�,Gt� y x ) EVENTS AND WHEN NOT BEING PAT70: 284 S.F. EXISTING i "\ y Aj LOT 11u� WORKED FOR MORE THAN TWO DAYS :` + o DRIVEWAY.• 617 S.F. STORMDRAIN �� \ ♦ ' ��ti ` l ��,� �` � o TOTAL: 2,989 S.F. LINE (TYPICAL) ^o EAST 30' REAR YARD LOT AREA: 7,682 S.F. BUILDING SETBACK L1NE30.00' PERCENT COVERAGE: 2,989 / 8,054 = 37.1% ; PROPOSED4" DIA. 0�Q 34�PA �y. cl MAXIMUM ALLOWED: 48.0% SANITARY SEWER I 5p\\ PLACE CONSTRUCTION FENCING \ 6' I AROUND EXISTING TREE AT DRIP \ COVERED LINE PLUS 6' (TYPICAL). \ s� ♦ PATIO o r Lu P:. \0. p¢ Q Z LOT LINE&PLAT BOUNDARY Z � �� 2018 \ I �, v ?,T Y OF ANACOR L - — Z I ITY OF ANACORTES LA �I n ® � w ® r ® ® ® � ® � ® � . . •.. . ., .< , . i � � J r .• / rT s�s1�, pace t= °� - - - - - - - - \ � l p LOT 13 D wNSPo�r_ I m pt WHIT AP " �t �� �£ > , -- .� —L - — --- — GRAPHIC SCALE 5.0011 34.00' \ 10.00' 6MQ C1Lo\: — --- —ri, 6 O 8 6 12 O ABOVE G PROPOSED 4"SCH p UVED BY \ s 40 PVC DRAIN LINE �'1"'� 6S t � C7 TO FI �� 60 Erosion Control Notes for Residential Construction-City of \ EXIST C10 A L ) SPf C-If' '6. Apt v cU PLAN$ '~ ( IN FEET \ 07 ,.,�1 Horaz. Scale: 1 Inch = 6 Feet Anacortes GRADE W1TF1 A THQRIZATyOtJ 221.3 LOT LINE \_ A. Erosion Control Best Management Practices shall be in place per the EXIST j�O, accepted site plan prior to an construction start. GRADE NORTH P P P Y � � � 49.00' I B. The erosion control shall be inspected once a day and modified to \ " meet the surrounding conditions as needed. A 43.91' o CAMPBELL (PLUS 4 ) C. The storm drain system shall be cleaned daily(Section 7-07.3).All CHECK DAM PER BMP 94.50' _ 2—CAR GARAGE LEFT drainage systems shall be cleaned to the acceptance of the City of I C207: CHECK DAMS, AS NEEDED. BMP C103: HIGH VISIBILITY eoM Anacortes prior to acceptance of the project. I _— D. Stabilized construction entrances and roads shall be installed at the I TEAK OF PUBLIC 'fa la x(y�l C)CC pi beginning of construction and maintained during the duration of the I ENTRY INTO CONSTRUCTION EROSION CONTROL PLAN project. Additional measures may be required such as wash pads to I SITE a, ensure that all paved areas are kept clean. No mud is allowed to I C Y-i Ft v- � �' LOT 11 (P 133669) enter onto City streets. I p p E. Any soils exposed that will not be disturbed for two(2)days during the I I 1506 LATITUDE CIRCLE wet season or seven (7)days in the dry season shall be immediately stabilized with the approved ESC methods(seeding, mulching, plastic i ( LOT 12 t I . p /� N A COpTES tp//\ covering, etc.) I /I t1 tlli E"\ �7� VV/"l F. Two (2)weeks prior to the beginning of the wet season(October 1), I I n / all disturbed areas shall be reviewed to identify which ones can be I I �(/W seeded in preparation for the winter rains. Disturbed areas shall be seeded within one (1)week of the beginning of the wet season.A JOB NO: PLAT OF "48 NORTH" sketch map of those areas to be seeded and those areas to remain uncovered shall be submitted to the Project Manager. The Project ABBREVIATED LEGAL DESCRIPTION: DESIGNED: LG Manager can require seeding in additional areas in order to protect surface waters, adjacent properties or drainage facilities. LOT 11, 48 NORTH PLAT & PUD, SECTION 22, TOWNSHIP 35 DRAWN: G. Penalties for an Erosion Control violation are subject to a$300 to NORTH, RANGE 1 EAST, W.M., CITY OF ANACORTES, SKAGIT DATE: 02/09/2017 $1000 fine under Chapter 17.66- Penalties for Violation. Each day is COUNTY, STATE OF WASHINGTON. considered a different violation. SHEET I LANDED GENTRY HOMES AND COMMUNITIES v v # , A'c Cr a , 4.: , 3 M a.. G +ir'x t' '+4`` s>"... � ,-.: �'•a: <.,; ^'' �i�-s�,a sin N1= � ... ... �. w , • esm 'Jae ,, ma a „e , as w,a , — s t ? S C r , v- ,� r k t b. li � A v '1 � 1 d r ' r < r � t v, xy K *�'.�v'�.�•-� f � L •' a s x'k:.i•+,-`Y9 ,Y"y,is „„, 4?tie G wno �Za �'h t �'S � �a�- y�' ''7, � rta ',a'Y, `.,vaC' w GRAPHIC SCALE : _•,�"°1' ,m� v;;.,_. i-,,..'. P _,a, ro .",a,: E 'w':",{`,^9 f '..x. ., M12. '$. , # .:, . a,r,,w a, +, k. ut u�J _ .,,,., •g.,... ,. . _^�S"`' >< , ,` r ., v t<t'.�"- h. 3 T< ,:: s_ i` '.. ,,�'� r .,e:.ew .s.. dk . .. .,-. -., ._.,...: r ..,... m."°.vr .'3i:..-. i .. ,• 5. ry ab .<....n6 ,F 6.. < ..S.w" $ i,e. .. , Old�. a?ai�%a.,o-..F..F. Y Al-aa.. ° � r d s Y W I„ IN .FEET ' k 1. e s 7Inchs Feet ,. .. _ Cro,.. .:.. ,7?'.,,,,.., ..: .,•. _.. _...& m , .�,u _..1.. ._ _.,. ., ,..: .:.,. �E,�: HOTZL. SCCLZB 1 I e im 48 NORTH < . COWMAN ,,:m,,.,a, ". a. .. .,s., .o-,.:.r. .,.,..,,re•' ..n.°...d.,a msa re.,, ter....-. ..... "si .,<._.. w. .,. :v... ...-e. ,� r :, _v. <- - :i -e r r Y. ^.k rv:. , ..p RAGE RI T r ,.�.. Y✓;^ , .v ...:1 ,.e..._< a .,a ._.. rd.. ,. ..,,. 5 „ .<.r sc.. <, s, '.. .fit. -♦ .r. r },.<. .Y. .,! x. :. r <.. •^.. ..< °k . . . _ ER OSION CONTROL PLAN s t LOT 11 (P133669 s p47V��Q. w���w�wwwwaw *-da fx.• " ag� ..�iv 3r �` ,,_�' 4 },asxy tativ3 t fiaa' 4 :'s ry,St{' "r`' fi' 150 LATITUDE CIRCLE to © o 000rt VICINITY MAP AACORTES WA :x-<$�' i ',, .. �-a. ,=iti•.i" 't^ . `.tj"„�v y 1-.`; 'T W% a y- a: 4 s �J.� .s i't`Xrti :i•' RWaa� ..§ y 4'n: $' Y.? .. .. . LOT 11 (P133669) ma rr rr 1506 LATITUDE CIRCLE f,.� (''�S ,� JOB $ NORTH � PLAT OF 4 r J ANACORTES, WA DESIGNED: LG FEB 5 2018 DRAWN: - DATE: 02109/201$ <^,!TY OF ANACORT SHEET f x° -.;�* fie 3�=..'L .�fk-d^.`.?.'v'4#4,:�3Af•� ,.. ,.'."3' $�r.S szk,1+"�:�5=>at7r�'�'_,�,• ,...::