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HomeMy WebLinkAboutPermit File BLD-2019-0716 3937 Rock Ridge Parkway (3) 'f r Storm Water Minimum Requirements #2 ENGINEERING DEPARTMENT � OCT: 3 0 2019 904 6�' Street Anacortes,WA 98221 www.anacorteswa. ov �• � i OCT 31 2019 g C 0 3, ANACORTES '�Y CITY OF ANACORTES FILE COPY Official Use Only: (Information to Inspectors) p ) Required Storm Water Facility and other related requirements: Project Address: 3937 Rock Ridcie Parkway Submittal Date: 10/30/2019 Parcel Number: P134313 Revision Number: Permit Number: X/Dy2O(7 O 7/C Acceptance D COAL: tV//`4 ' Reviewer: FRONT OF REPORT Submittal Checklist: o TAB 1 - Drainage Analysis— Minimum Requirement#2 o APPENDIX 1 - Survey performed by a Professional Land Surveyor o APPENDIX 2 - Model Soil Management Plan for BMP T5.13 o APPENDIX 3 - Determining Construction Site Sediment Damage Potential (Appendix 7) o APPENDIX 4 - Site Plan with all applicable information (Minimum Size 11x17 —30 scale) o APPENDIX 5 - Documented Site Photos (North, South, East and West) Project Description: (What is it you are looking to do? Provide details regarding, but not limited to, Lot SF, Home SF, New and Replaced Hard Surface) Construction of a new 3,034 SF home on a 9,203 SF lot. The new and hard replaced surface is 4,322 sq.ft. for the house and deck with an additional 1,538 sq.ft. in driveway. This is a total of 5,860 sq.ft. Existing Site Conditions Summary: (Additionally, provide information on previous permits, if any, like Grade and Fill, Clear and Grade, topography, vegetation, drainage, Critical Areas adjacent to the site and how it may affect this project if soils are disturbed, Soils Type (Included in Soils Analysis Report), Erosion Problem Areas, Construction PhasinglSequence) The site was developed under Rock Ridge Phase 5, which had all the appropriate permits and has been accepted by the City of Anacortes City Council and recorded. The site is sloping mostly from center to south and west sides of lot. The average sloping grade is around 1% to 22%. 51% at the edge. This site is part of a Common Plan of Development. The development had the detention pond upsized for flow control for both Rock Ridge Phase 4 and 5. This was accepted April 12, 2018. The report is part of the recorded subdivision and covered Minimum Requirements 1, 3, 4, 5, 6, 7, 8 and 9 for each lot. Therefore, this project is submitting Minimum Requirement 2 only Version Date: December 19, 2018 A soils analysis was not done for this site since it is solid rock and is identified as impervious surface. There are no known critical areas adjacent to this property that would offer any concern by building on this property, or any Erosion problems by building on this site. Construction Sequencing: (Note: sequence may not fall in this order, but close) o Installation of Erosion and Sedimentation BMP's. o Minor rock excavation work to ensure compliance with required BMP's under Minimum Requirement 5 and 6. o Installation of the footings and foundations. o Construction of the home. o Connection of the utilities to the home. o Installation of MR#5 required BMP's o Backfill of site with BMP T5.15 Post Construction Soils, Landscaping, driveway, driveway access. See Appendix - Model Soil Management Plan for BMP T5.13 Developed Conditions Summary: (Additionally, to be shown on the site plan. Identify cut and fill areas, proposed slopes of all hard surfaces , proposed contours) Proposed slopes on hard surfaces are showing. Site proposed final grade plan is showing proposed grade and slopes. Cut and fill dependent on how much rock needs to be chipped out, but general a general cut and fill calc. has been given. Site Sediment Transport Score: >100 Total Points (High\Low) (See Appendix 4- Determining Construction Site Sediment Damage Potential(Appendix 7) Drainage Basin (2007 Storm Comp Plan — City website\publicworks\engineering\comprehensive plans): What Drainage Basin are you in? GB Identify any downstream drainage issues (Storm Comp Plan: Yes, Identified If so, describe: Problem Area#13—Oakes Avenue and Georgia Avenue Problem:A natural depression exists on a parcel that will soon be developed. A pipe drains the depression to the north side of Oakes Avenue. Solution: Install a trash rack like that described for Area#5 to keep pipe inlet clear of debris. Response: The natural depression was filled in revising the natural drainage path for this parcel insofar as raising the elevation. The natural discharge is still at the same location. This issue has been resolved with development and does not affect this project. Problem Area #28—Kansas Avenue and West 6th Street Problem:A shallow manhole is located at the intersection. Solution: The City has preliminary plans for the new storm system in this area. The new system will divert existing flows to lllinios Avenue. The downstream system should be analyzed for capacity. Version Date: December 19, 2018 Start Here Does the site have 35% Yes see Redevelopment Msnurr or more of existing Requirements and Flow Chart impervious coverage? Fgure 1-2.4.2)- No Does the project convert 3 j • acres or more of vegetation to Does the project resul: r lawn or landscaped areas. or 5.000 square feet. or No convert 2_5 acres or more of Brea?er. of new pi us 10 native vegetaEon ' pastLire^ -eolaced hard surface area? No Yes Yes Does the project result in 2.CCIC • square feet, or greater, of new pi us 111, All Minimum Requirements 'replaced hard surface area" apply to the new and replaced hard surfaces and converted Yes/ No vegetation areas. • Does the project have land Minimum Requirements *1 01' disturbing activities of 7,000 through #5 apply to the new ♦ Yes square tee: or greater? and replaced hard surfaces and the land disturbed. No T Minimum Requirement#2 applies_ 11111 Figure I-2.4_1 Flow Chart for Determining Requirements for New Development DEPARTMENT OF Revises..une:1'215 ECOLOGY Diem:2 see ' hwm a ma.crt,too .ham'tor copyright to ioe inducing perr^issiceis State o° ritror tr'la011trf aridttsclarrer. version uaie: uecemoer f�, zu-i o DoS _ __.. . . = :t,:L sq-.3-e feet or more of new plus replaced hard surface OR Does the hand disturbing activity total 7.000 square feet or greater? v Yes No M.rpm jrr- Requirements#t through 40E apply tc Pe new and replaced hard Minimum Requirement*2 applies_ s_rra sac and the land disturbed. Next Question V Does the project add 5.000 square feet or more of new hard surfaces? OR Convert 34 acres or more of vegetation to Lawn or landscaped areas? OR Convert 2.5 acres or more of native vegetation to pasture? T Yes No AD Minimum Requirements apply Next Question is this a road to the new hard surfaces and the lM NO converted vegetation areas. project- Yes Does the project add f,OC'3 square feet or more of new hard surfaces'' Yes No is the togai of near plus replaced hard si.fa.,- Do the new na- t 5.000 square feet or more surfaces ace ^{' AND more to �' - - - _ NO No additional ENO does the value of the proposed verre- hard surf All minimum req. are taken care of by - including interior improvements -exceed the prof common plan of development. Only 50%of the assessed vakie for repiacem -- minimum req. #2 is needed. value' cf the e, 7 'S -1provements Yes AM Minimum Requirements apply to the new and replaced hard surfaces and converted vegetation areas. Yes Figure 1-2.4.2 Flow Chart for Determining Requirements for Redevelopment DEPARTMENT OF =.=.shy 3ry::if ECOLOGY Please zee,, ,,,anew ecy.wa.gowcopy-gn►-,hrrn;for Dopyrltytt 1Qiicz rowing cer nissicela Slate of M13s1 11 gton tr!Manor c9Itaolttyr,and disclaimer. Version Date: December 19, 2018 TAB 2 (MINIMUM REQUIREMENT #2) • 1-2.5.2 Minimum Requirement#2 —Construction Stormwater Pollution Prevention Plan (SWPP) - All projects are required to complete Minimum Requirement 2. - Refer to the 13 Elements of the SWPP (See document below, complete and attach) - See attached Table 4.1.1, Table 4.2.1 and Table - Provide Engineering Calculations as an attachment for Sediment Ponds\Traps, Diversions, Waterways and Runoff/Stormwater Detention Calculations. The site was developed under Rock Ridge Phase 5, which had all the appropriate permits and has been accepted by the City of Anacortes City Council and recorded. The site is sloping mostly from center to south and west sides of lot. The average sloping grade is around 1% to 22%. 51% at the edge. This site is part of a Common Plan of Development. The development had the detention pond upsized for flow control for both Rock Ridge Phase 4 and 5. This was accepted April 12, 2018. The report is part of the recorded subdivision and covered Minimum Requirements 1, 3, 4, 5, 6, 7, 8 and 9 for each lot. Therefore, this project is submitting Minimum Requirement 2 only A soils analysis was not done for this site since it is solid rock and is identified as impervious surface. There has been a soils analysis done on the soil stock pile that is used for fill on the Rock Ridge lots and is included in appendix 2 There are no known critical areas adjacent to this property that would offer any concern by building on this property, or any Erosion problems by building on this site. See attached 13 Elements of a Construciton SWPPP. The Site Plan will be added to the Appendix 4. BMP C162 Scheduling: Construction Sequencing: (Note: sequence may not fall in this order, but close) o Installation of Erosion and Sedimentation BMP's. o Minor rock excavation work to ensure compliance with required BMP's under Minimum Requirement 5 and 6. o Installation of the footings and foundations. o Construction of the home. o Connection of the utilities to the home. o Installation of MR#5 required BMP's o Backfill of site with BMP T5.15 Post Construction Soils, Landscaping, driveway, driveway access. See Appendix 2 and MR# 5 Model Soil Management Plan for BMP T5.13 Version Date: December 19, 2018 Table 4.1.1 Source Control BMP's by SWPPP Element Version Date: December 19, 2018 Element#1 Element#2 Element#13 Element#5 Element#6 Element#9 Element#11 Element#12 Preserve Establish Protect Low BMP or Element Name Stabilize Protect Control Maintain Manage the Vegetation lark Construction Soils Slopes Pollutants BM Ps Project Impact Clearina Limits Access Development BMP C101: Preserving Natural Vegetation ✓ BMP C102:Buffer Zones V ✓ BMP C103:High Visibility Plastic or Metal ✓ Fence BMP C105: Stabilized Construction ✓ Entrance /Exit BMP C106: Wheel Wash ✓ BMP C107: Construction Road/Parking ✓ Area Stabilization BMP C120:Temporary and Permanent ✓ ✓ Seeding BMP C121: Mulching ✓ V BMP C122: Nets and Blankets ✓ ✓ BMP C123: Plastic Covering ✓ BMP C124: Sodding ✓ BMP C125: Topsoiling /Composting ✓ BMP C126: Polyacrylamide for Soil Erosion ✓ Protection BMP C130: Surface Roughening ✓ ✓ BMP C131: Gradient Terraces ✓ ✓ BMP C140: Dust Control ✓ BMP C150: Materials On Hand ✓ ✓ BMP C151: Concrete Handling ✓ BMP C 152: Sawcutting and Surfacing ✓ Polution Prevention BMP C153: Material Delivery, Storage and ✓ Containment BMP C154: Concrete Viashout Area ✓ BMP C160: Certilied Erosion and ✓ ✓ Sediment Control Lead BMP C162: Scheduling V Table 4.2.1. Runoff Conveyance and Treatment BMP's by SWPPP Clement Version Date: December 19, 2018 B in=A BadarrtiFt B1am=HNl Manta w 6eanrs** ebasntON _trp IMP or!Maur!Naar - Colrol batch P r log Plaint Sbb_ Control Coabvi Br Prated I aw • lib Rain armob 0 Iswassuunt Cantrob oar COW bla oaplot OIr a=kola ✓ I OUP C M Graesa.iaed Ctrannalo ✓ Bir Calk Omani tI ✓ MVP CM Water Oars 1 011kiCak P=glom Of ✓ IOW C ✓ BOP COM Level Sprsadu I OOP CIO?:Clock grater ✓ ✓ BOP PM Td1■ir SM Deo CGsvleidSo ✓ • . ✓ Hama t Chock MP CM: OWht Prr+lma= I IMP CZ! glom Dada blot Prvbdlbn ✓ OMP C2a1: knish Iardar ✓ ✓ BMP C231k gram!FMK Shea ✓ 1 OOP calf SM Fenn ✓ ✓ OOP Mk v ON=Ilklp - ✓ ✓ OOP cOM Nala.a ' ✓ IMP COM V►p W=FNbaak= ✓ O OP CSM Sadiw.4 Trams ✓ ✓ • BOP CNN Tenoa'Oy ierBari*Peed ✓ ✓ IMP CM&Clo akrnlba Shur a ka ✓ Chemed Tarminst O OP tilt:Cookucgan OOnarawlvr i Flrollen O OP=OHIO pM Neese Unto COI BOP COO pM Caned for HI.pi Mbar ✓ 13 Elements of SWPPP Version Date: December 19, 2018 (Construction Stormwater Pollution Prevention Plan) Please check off boxes to show that each element has been read and understood. Provide details where applicable and if certain aspects are unnecessary or exempt, clearly justify. Details of the 13 Elements and the correlating BMPs are listed Above from the 2014 Stormwater Management Manual for Western Washington (SWMMWW). A link is provided on the City of Anacortes website, under Planning, Community, & Economic Development Department, as well as under Stormwater on the Engineering Division of Public Work's page. Owner Name: Royal and Diane Reinsch 393 I Site Address: en Rock Ridge Parkway Prepared By: Jason Sterling The Stormwater checklist or building permit determined that: ❑ The 13 elements must be addressed ❑ These elements must be addressed for construction activity adding under for construction activity adding 2,000 2,000 sq. ft. of hard surface area. sq. ft. or more of hard surface area. This means that an attached narrative and site plan are required with this document. Under each element, explain the best management practices (BMPs) used or justify reasoning for those that will not be used. If needed, please attach a narrative to further explain plans or justification. ELEMENT 1: Preserve Vegetation/Mark Clearing Limits ❑ Before beginning land disturbing activities, 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 top soil, and natural vegetation in an undisturbed state to the maximum degree practical. Site was cleared in approximately 2010 prior to the construction of Rock Ridge Phase V being constructed. Under a Clear and Grade permit for Rock Ridge Phase V, under brush and alder trees that had grown in the last 7 years was cleared off the lot. ELEMENT 2: Establish Construction Access ❑ Limit construction vehicle access and exit to one route, if possible. ❑ Stabilize access points with a pad of quarry spalls, crushed rock, or other equivalent BMPs, to minimize tracking onto roads. ❑ Locate wheel wash or tire baths on site, if the stabilized construction entrance is not effective in preventing tracking sediment onto roads. ❑ If sediment is tracked off site, clean the affected roadway thoroughly at the end of each day, or more frequently as necessary (ex: wet weather). Remove sediment from roads by shoveling, sweeping, or pick up and transport the sediment to a controlled sediment disposal area. ❑ Conduct street washing only after sediment is removed in accordance with the above bullet. ❑ Control street wash wastewater by pumping back on site or otherwise preventing it from discharging into systems tributary to waters of the State. We will utilize BMP C107 Construction Road\Parking Area Stabilization. The installation and j maintenance specifications are attached to the 13 Elements. Version Date: December 19, 2018 ELEMENT 3: Control Flow Rates ❑ 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 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. Since the site is solid rock with a layer of soil on top of the rock, The site will utilize BMP C162 Scheduling to help with flow control. Gutters will be installed with temporary downspouts to the gutter downspout piping to convey any potential increase in runoff away from the site. The project will utilize existing BMP C233 Silt Fence along the west, south, and east boundary. Additionally, the project will utilize BMP C212 Mulching along the west, south and east boundaries, along with BMP C235 Wattles if necessary. (kJ The lot slopes mostly towards the west and south and some towards the east. If BMP C24Y necessary, the proposed location will be in the west/south portion of the lot, near bottom of slope. This BMP will need to be designed and reviewed by the COA prior to implementation. ELEMENT 4: 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 stormwater runoff, and soil characteristics, including the range of soil particle sizes expected to be present on the site. ❑ Direct stormwater runoff from disturbed areas through a sediment pond or other appropriate sediment removal BMP, before the runoff leaves a construction site or before discharge to an infiltration facility. Runoff from fully stabilized areas may be discharged without a sediment removal BMP, but must meet the flow control performance standard in Element#3, bullet#1. ❑ Locate BMPs intended to trap sediment on-site in a manner to avoid interference with the movement of juvenile salmonids attempting to enter off-channel areas or drainages. ❑ Provide and maintain natural buffers around surface waters, direct stormwater to vegetated areas to increase sediment removal, and maximize stormwater infiltration. ❑ Where feasible, design outlet structures that withdraw impounded stormwater from the surface to avoid discharging sediment that is still suspended lower in the water column. The sediment controls have been identified on the site plan and are included in Appendix 4 of this report. BMP's that will be on-site for additional protection are: BMP C235 Straw Wattles, BMP C240 Temporary Sediment Trap (if necessary). ELEMENT 5: Stabilize Soils ❑ Stabilize exposed and unworked soils by application of effective BMPs 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 of gravel base early on areas to be paved, and dust control. ❑ Control stormwater volume and velocity within the site to minimize soil erosion. Version Date: December 19, 2018 ❑ 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 1 — Sept 30): 7 days o During the wet season (Oct 1 —Apr 30): 2 days ❑ Stabilize soils at the end of the shift before a holiday or weekend if needed based on the weather forecast. ❑ Stabilize soil stockpiles from erosion, protect with sediment trapping measures, and where possible, be located away from storm drain inlets, waterways, and drainage channels. ❑ Minimize the amount of soil exposed during construction activity. ❑ Minimize the disturbance of steep slopes. ❑ Minimize soil compaction and, unless infeasible, preserve topsoil. Exposed stock piles will be covered with BMP C123 Plastic Covering and other exposed areas with BMP C121 Mulching. ELEMENT 6: 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). ❑ Divert off-site stormwater (run-on) or ground water away from slopes and disturbed areas with interceptor dikes, pipes, and/or swales. Off-site stormwater should be managed separately from stormwater generated on the site. ❑ At the top of slopes, collect drainage in pipe slop drains or protected channels to prevent erosion. o *Temporary pipe slope drains must handle the peak volumetric flow rate calculated using a 10- minute time step from a Type 1A, 10-year, 24-hour frequency storm for the developed condition. Alternatively, the 10-year, 1-hour flow 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 existing land cover condition for predicting flow rates from tributary areas outside the project limits. 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 (WWHM) to predict flows, bare soil areas should be modeled as "landscaped" area. o Where 15-minute 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 with safety and space considerations. ❑ Place 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 Element 5. ❑ BMP combinations are the most effective method of protecting slopes with disturbed soils. Ex: Use both mulching and straw erosion control blankets. The Natural Discharge location will be protected by BMP C233 Silt Fence. ELEMENT 7: 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 Version Date: December 19, 2018 conveyance system without first being filtered 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. Inlets will be protecting using BMP C220. A Supplement detail will WSDOT Standard Detail I-40.20-00 Storm Drain Inlet Protection since DOE does not have an equivalent detail to use. ELEMENT 8: Stabilize Channels and Outlets ❑ Design, construct, and stabilize all on-site conveyance channels to prevent erosion from the following expected peak flows: o *Channels must handle same peak volumetric flow rate as temporary pipe slope drains listed in Element 6, above. ❑ Provide stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent streambanks, slopes, and downstream reaches at the outlets of all conveyance systems. ❑ The best method for stabilizing channels is to completely line the channel with a blanket product first, then add check dams as necessary to function as an anchor and to slow the flow of water. The Natural Discharge location will be protected by BMP C233 Silt Fence. ELEMENT 9: Control Pollutants ❑ Design, install, implement, and maintain effective pollution prevention measures to minimize 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. On-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 largest tank within the containment structure. Double-walled 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. ❑ Discharge wheel wash or tire bath wastewater to a separate on-site treatment system that prevents discharge to surface water, such as closed-loop 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. ❑ Assure that washout of concrete trucks is performed off-site or in designated concrete washout areas only. Do not wash out concrete trucks onto the ground, or 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 using chemical treatment other than CO2 or dry ice to adjust pH. Version Date: December 19, 2018 ❑ Woody debris may be chopped and spread on site. ❑ Conduct oil changes, hydraulic system drain down, solvent and de-greasing 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 stormwater runoff using spill prevention measures, such as drip pans. ❑ Clean 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. All chemicals, liquid products, petroleum products, solvents and other potentially environmental1 hazardous products will be locked in the site job trailer. BMP C154 Concrete Washout Area will be utilized. A Concrete Washout area has been installed within the Rock Ridge Phase IV and V subdivision. No fueling or oil changes are being performed on-site. i Contractor will be required to have a Spill Kit on-site that is accessible by all workers on the project. ELEMENT 10: 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, 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 8, 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. ❑ 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, clamshell digging, concrete tremie pour, or work inside a cofferdam can create highly turbid or contaminated dewatering water. ❑ Discharging sediment-laden (muddy) water into waters of the State likely constitutes a violation of water quality standards for turbidity. The easiest way to avoid discharging muddy water is through infiltration and preserving vegetation. Site is solid rock. No Dewatering is anticipated ELEMENT 11: Maintain BMPs ❑ Maintain and repair all temporary and permanent erosion and sediment control BMPs as needed to assure continued performance of their intended function in accordance with BMP specifications. ❑ Remove all temporary erosion and sediment control BMPs within 30 days after achieving final site stabilization or after the temporary BMPs are no longer needed. Some temporary erosion and sediment control BMPs are bio-degradable and designed to remain in place following construction such as compost socks. ❑ Provide protection to all BMPs installed for the permanent control of stormwater from sediment and compaction. All BMPs that are to remain in place following completion of construction shall be Version Date: December 19, 2018 examined and placed in 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. ❑ Remove or stabilize trapped sediment on site. Permanently stabilize disturbed soil resulting from removal of BMPs or vegetation. See Element 3 above for additional BMP's that will be on hand for additional runoff measures. BMP's will be reviewed and inspected daily and revised accordingly. ELEMENT 12: Manage the Project— Projects subject to Minimum Requirements 1-9 must have a Certified Erosion and Sediment Control Lead (CESCL) for site inspections. Projects subject to Minimum Requirements 1-5 do not require the inspector to be certified. By the initiation of construction, the SWPPP must identify the CESCL or inspector, who shall be present on-site or on-call at all times. ❑ 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. ❑ 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 silt-laden runoff from leaving the site through a combination of the following: 1. Site conditions including existing vegetative coverage, slope, soil type, and proximity to receiving waters. 2. 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 Stormwater. ❑ The following activities are exempt from the seasonal clearing and grading limitations: 1. 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 soil or result in the removal of the vegetative cover to soil 3. Activities where there is 100% infiltration of surface water runoff within the site in approved and installed erosion and sediment control facilities. Since this lot is part of a Common Plan of Development a qualified CESCL will be on-site.," A sign will be posted on-site with a name and 24-hour number. ELEMENT 13: Protect Low Impact Development BMPS ❑ If implementing any bioretention facilities or rain gardens, refer to the applicable BMP sections of the Manual for requirements. There is no Low Impact Development BMP's proposed with this project. ant ignat Date Version Date: December 19, 2018 BMP C107: Construction Road/Parking Area Stabilization Purpose Stabilizing subdivision roads, parking areas, and other on-site vehicle transportation routes immediately after grading reduces erosion caused by construction traffic or runoff. Conditions of Use Roads or parking areas shall be stabilized wherever they are constructed, whether permanent or temporary, for use by construction traffic. • High Visibility Fencing (see BMP C103: High Visibility Fence) shall be installed, if necessary, to limit the access of vehicles to only those roads and parking areas that are stabilized. Design and Installation Specifications • On areas that will receive asphalt as part of the project, install the first lift as soon as possible. • A 6-inch depth of 2- to 4-inch crushed rock, gravel base, or crushed surfacing base course shall be applied immediately after grading or utility installation. A 4-inch course of asphalt treated base (ATB) may also be used, or the road/parking area may be paved. It may also be possible to use cement or calcium chloride for soil stabilization. If cement or cement kiln dust is used for roadbase stabilization, pH monitoring and BMPs (BMP C252: High pH Neutralization Using CO2 and BMP C253: pH Control for High pH Water) are necessary to evaluate and minimize the effects on stormwater. If the area will not be used for permanent roads, parking areas, or structures, a 6-inch depth of hog fuel may also be used, but this is likely to require more maintenance. Whenever possible, construction roads and parking areas shall be placed on a firm, compacted subgrade. • Temporary road gradients shall not exceed 15 percent. Roadways shall be carefully graded to drain. Drainage ditches shall be provided on each side of the roadway in the case of a crowned section, or on one side in the case of a super-elevated section. Drainage ditches shall be directed to a sediment control BMP. • Rather than relying on ditches, it may also be possible to grade the road so that runoff sheet- flows into a heavily vegetated area with a well-developed topsoil. Landscaped-areas are not adequate. If this area has at least 50 feet of vegetation that water can flow through, then it is generally preferable to use the vegetation to treat runoff, rather than a sediment pond or trap. Version Date: December 19, 2018 The 50 feet shall not include wetlands or their buffers. If runoff is allowed to sheetflow through adjacent vegetated areas, it is vital to design the roadways and parking areas so that no concentrated runoff is created. • Storm drain inlets shall be protected to prevent sediment-laden water entering the storm drain system (see BMP C220: Storm Drain Inlet Protection). Maintenance Standards Inspect stabilized areas regularly, especially after large storm events. Crushed rock, gravel base, etc., shall be added as required to maintain a stable driving surface and to stabilize any areas that have eroded. Following construction, these areas shall be restored to pre-construction condition or better to prevent future erosion. Perform street cleaning at the end of each day or more often if necessary. Version Date: December 19, 2018 TAB 5 (MINIMUM REQUIREMENT #5) • Minimum Requirement#5—On-site Stormwater Management All sites are required to utilize BMP T5.13— Post Construction Soil Quality and Depth. For each surface, consider the BMP's in the order listed for that type of surface. Use the first BMP that is considered feasible. No other on-site Stormwater Management BMP is necessary for that surface. Feasiblity shall be determined by evaluation against: 1. Design criteria, limitations and infeasiblity criteria identified for each BMP in this manual, and; 2. Competing needs criteria listed in Chapter V-5 — On-site Stormwater Management. Lawn and Landscaped Area: • BMP T5.13: Post-Construction Soil Quality and Depth. (Attach Detail in Report) Refer to this site for requirements and specifications. All projects are required to utilize this BMP. http://www.soilsforsalmon.orq/pdf/Soil BMP Manual.pdf See below for the "Model Soil Management Plan for BMP T5.13" to be a deferred submitted Version Date: December 19, 2018 PROJECT INFORMATION "Model Soil Management Plan for BMP T5.13" age# of pages Complete all information on page 1; only site address and permit number on additional pages. Site Address/Lot No.: Permit Type: Permit Number: Permit Holder: Phone: Mailing Address: Contact Person: Phone: Plan Prepared By: ATTACHMENTS REQUIRED(Check off required items that are attached to this plan) Site Plan showing,to scale: Areas of undisturbed native vegetation(no amendment required) New planting beds and turf areas(amendment required) Type of soil improvement proposed for each area Soil test results(required if proposing custom amendment rates) Product test results for proposed amendments AREA# (should match Area#on Site Plan) PLANTING TYPE Turf Undisturbed native vegetation Planting Beds Other: SQUARE FOOTAGE OF THIS AREA: square feet SCARIFICATION inches(depth)of scarification needed to achieve finished total 12"loosened depth. Subsoil will be scarified PRE-APPROVED inches of compost or imported topsoil applied AMENDMENT METHOD: X 3.1 (conversion factor, inches to cubic yards) PRODUCT: Topsoil import =cu.yards per 1,000 sq. ft. Amend with compost X ,000s sq.ft. in this area Stockpile and amend =cubic yards of amendment —*—*—*—f—+ QUANTITY: CU.YDS. ( cu.yds. stockpiled) (needed to cover this area to designated depth) CUSTOM AMENDMENT Attach test results and calculations. Topsoil import inches organic matter or topsoil import PRODUCT: Topsoil&compost lift X 3_1 Amend =cu.yards/ 1,000 sq. ft. Stockpile and amend X ,000s sq.ft. in this area ( cu.yds. stockpiled) =cubic yards of amendment —*—*——>—> QUANTITY: CU.YDS. MULCH ,000 sq.ft. PRODUCT: X 6.2 (conversion, to give 2 inch mulch depth) =cubic yards of mulch —*—*—*—*—>—> QUANTITY: CU.YDS. TOTAL AMENDMENT/TOPSOIL/MULCH FOR ALL AREAS(complete on page 1 only, totaling all areas/pages in this Plan) ❑ Product#1: ❑Quantity: cu.yds. ❑ Test Results: % organic matter C:N ratio<25:1(except mulch,or<35:1 for native plants) "stable"(yes/no) ❑ Product#2: ❑ Quantity: cu.yds. ❑ Test Results: %organic matter C:N ratio<25:1 (except mulch,or<35:1 for native plants) "stable"(yes/no) ❑ Product#3: ❑ Quantity: cu.yds. ❑ Test Results: %organic matter C:N ratio<25:1 (except mulch,or<35:1 for native plants) "stable"(yes/no) Date: Inspector: Approved: Revisions Required: Date: Inspector: Approved: Revisions Required: Version Date: December 19, 2018 APPENDIX 1 — Survey performed by a Professional Land Surveyor Note: Submitted with permit application Version Date: December 19, 2018 APPENDIX 2 — Model Soil Management Plan for BMP T5.13 Note: Document is provided under Minimum Requirement 5 in this document. Soil report attached below. Version Date: December 19, 2018 PAP-Accredited Northwest Agricultural Consultants RR SUMMIT NW, LLC 2545 West Falls PO BOX 319 Kennewick, WA 99336 ANACORTES, WA 98221 (509) 783-7450 Fax: (509) 783-5305 NAPT 2016 SOIL Client No.: 11396 Date Received: 03-13-2017 Report No.: 40544 Page: 1 of 1 33251 f-58756 Grower Sampler Field No. Field Name Crop Year Crop Yield Goal Strandberg Depth Available NO3-N NH4-N Sulfur pH Soluble Organic P(bic) K(bic) P(ace) K(ace) Calcium Magne- Sodium Eff. Boron Zinc Manga- Iron Copper CEC %Base Chloride Bray 1 P Total Sample) (ft.) Inches lbs/acre lbs/acre ppm Salts Matter ppm ppm ppm ppm (meq. slum (meq. ppm ppm nese ppm ppm (meq. Sat. lbs.per. ppm Bases D (mmhos Percent per 100 (meq. per 100 ppm per 100 acre (meq. /cm) grams) per 100 grams) grams) per 100 grams) grams) 1 7.69 24.5 Total 0.00 Estimated Nitrogen Release from Organic Matter Estimated Total Nitrogen Available to Crop Last Year's Crop Fertilizer Comments CEC Method : EPA 9081 OM Method: Loss on Ignition APPENDIX 3 - Determining Construction Site Sediment Damage Potential (Appendix 7 - NPDES Phase II Permit) Note: See attached Version Date: December 19, 2018 Western Washington Phase II Stormwater Permit APPENDIX 7 - Determining Construction Site Sediment Damage Potential The following rating system allows objective evaluation of a particular development site's potential to discharge sediment. Permittees may use the rating system below or develop alternative process designed to identify site-specific features which indicate that the site must be inspected prior to clearing and construction. Any alternative evaluation process must be documented and provide for equivalent environmental review. Step one is to determine if there is a sediment/erosion sensitive feature downstream of the development site. If there is such a site downstream complete step two, assessment of hydraulic nearness. If there is a sediment/erosion sensitive feature and it is hydraulically near the site then go to step three to determine the construction site sediment transport potential. STEP 1 —Sediment/Erosion Sensitive Feature Identification Sediment/erosion sensitive features are areas subject to significant degradation due to the effect of sediment deposition or erosion. Special protection must be provided to protect them. Sediment/erosion sensitive features include but are not limited to: i. Salmonid bearing fresh water streams and their tributaries or freshwater streams that would be Salmonid bearing if not for anthropogenic barriers; ii. Lakes; iii. Category I, II, and III wetlands; iv. Marine near-shore habitat; v. Sites containing contaminated soils where erosion could cause dispersal of contaminants; and vi. Steep slopes (25% or greater) associated with one of the above features. Identify any sediment/erosion sensitive features, and proceed to step two. If there are none the assessment is complete. STEP 2 — Hydraulic Nearness Assessment Sites are hydraulically near a feature if the pollutant load and peak quantity of runoff from the site will not be naturally attenuated before entering the feature. The conditions that render a site hydraulically near to a feature include, but are not limited to, the following: i. The feature or a buffer to protect the feature is within 200 feet downstream of the site. ii. Runoff from the site is tight-lined to the feature or flows to the feature through a channel or ditch. August 1, 2013, Modified January 16, 2015 Appendix 7- Determining Sediment Damage Potential Page 1 of 3 Version Date: December 19, 2018 A site is not hydraulically near a feature if one of the following takes place to provide attenuation before runoff from the site enters the feature: iv. Sheet flow through a vegetated area with dense ground cover v. Flow through a wetland not included as a sensitive feature vi. Flow through a significant shallow or adverse slope, not in a conveyance channel, between the site and the sensitive feature. Identify any of the sediment/erosion sensitive features from step one that are hydraulically near the site, and proceed to step three. If none of the sediment/erosion sensitive features are hydraulically near the site, the assessment is complete. vii. STEP 3— Construction Site Sediment Transport Potential Using the worksheet below, determine the total points for each development site. Assign points based on the most critical condition that affects 10% or more of the site. If soil testing has been performed on site, the results should be used to determine the predominant soil type on the site. Otherwise, soil information should be obtained from the county soil survey to determine Hydrologic Soil Group (Table of Engineering Index Properties for step 1.D) and Erosion Potential (Table of Water Features for step 1.E) When using the county soil survey, the dominant soil type may be in question, particularly when the site falls on a boundary between two soil types or when one of two soil types may be present on a site. In this case, the soil type resulting in the most points on the rating system will be assumed unless site soil tests indicate that another soil type dominates the site. Use the point score from Step 3 to determine whether the development site has a high potential for sediment transport off of the site. Total Score Transport Rating <100 Low ❑100 High A high transport rating indicates a higher risk that the site will generate sediment contaminated runoff. Construction Site Sediment Transport Potential Worksheet A. Existing slope of site (average, weighted by aerial extent): Points 2% or less ...0 >2-5% 5 >5-10% 15 >10-15% 30 >15% 50 B. Site Area to be cleared and/or graded: <5,000 sq. ft 0 5,000 sq. ft. — 1 acre 30 >1 acres 50 C. Quantity of cut and/or fill on site: <500 cubic yards 0 500 —5,000 cubic yards 5 >5,000— 10,000 cubic yards 10 >10,000—20,000 cubic yards 25 >20,000 cubic yards 40 D. Runoff potential of predominant soils (Natural Resources Conservation Service): Hydrologic soil group A 0 Hydrologic soil group B 10 Hydrologic soil group C 20 Hydrologic soil group D 40 E. Erosion Potential of predominant soils (Unified Classification System): GW, GP, SW, SP soils 0 Dual classifications (GW-GM, GP-GM, GW-GC, GP-GC, SW-SM, SW-SC, SP-SM, SP-SC) 10 GM, GC, SM, SC soils 20 ML, CL, MH, CH soils 40 F. Surface or Groundwater entering site identified and intercepted1: Yes 0 No 25 G. Depth of cut or height of fill >10 feet: Yes 25 No 0 H. Clearing and grading will occur in the wet season (October 1 — May 1): Yes 50 No 0 TOTAL POINTS >100 1 If no surface or groundwater enters site, give 0 points. APPENDIX 4— Site Plan with all applicable information (Minimum Size 11x17 at a legible scale) Note: Submitted with permit application APPENDIX 5 — Documented Site Photos (Show all directions of the site, including frontage) 400mio, • t PV j Location: South side of lot. Description of the photo: South side of lot looking towards north side of lot. Photo taken by: Jason Sterling • Location: East side of lot. 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