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HomeMy WebLinkAboutBLD-2025-0098 - RESIDENTIAL SINGLE FAMILY BUILDINGPARCEL: P60633 LEGAL DESCRIPTION: (0.3970 ac) THAT PORTION OF TRACT B, WOODS ADDITION TO ANACORTES, WASHINGTON, AS PER PLAT RECORDED IN VOLUME 4 OF PLATS, PAGE 35, RECORDS OF SKAGIT COUNTY, WASHINGTON, DESCRIBED AS FOLLOWS: BEGINNING AT THE NORTHWEST CORNER OF SAID TRACT B; THENCE SOUTH 89-40-16 EAST A DISTANCE OF 155.38 FEET TO THE POINT OF BEGINNING; THENCE NORTH 89-40-16 EAST A DISTANCE OF 134.99 FEET; THENCE SOUTH 0 -03-55 EAST A DISTANCE OF 105.00 FEET; THENCE NORTH 89-40-16 EAST A DISTANCE OF 20.00 FEET; THENCE SOUTH 0-03 -55 EAST A DISTANCE OF 20.00 FEET; THENCE SOUTH 89-40-16 WEST A DISTANCE OF 155.28 FEET; THENCE NORTH 0-04- 00 EAST A DISTANCE OF 125.00 FEET TO THE POINT OF BEGINNING. AKA LOT B OF SURVEY AF#202512230044 APPLICANT: Culbertson, Gary 2505 Puget Way Anacortes, WA 98221 4078649100 OWNER: CULBERTSON GARY R UNKNOWN ORLANDO, FL 32832 VALUATIONS: Estimated construction cost 42000.00 $42,000.00 $42,000.00Total: FEES:Paid Due Fire Impact Fee Fire Portion $123.81 $0.00 Sewer Inspection Fee $60.51 $0.00 SFR TRANSPORTATION IMPACT FEE $3,501.13 $0.00 Park Impact Fee SFR $1,644.37 $0.00 State Building Code Council fee $6.50 $0.00 SFR or duplex site plan review $60.00 $0.00 Building Permit Fee $563.45 $0.00 STORM DRAIN GFC ONE ERU $2,116.00 $0.00 Plan Review Fee $366.24 $0.00 Mechanical and plumbing remodel fixtures fees $83.05 $0.00 Storm Water Review Sq Ft $195.04 $0.00 SFR SEWER GFC $11,684.00 $0.00 Fire Impact Fee EMS Portion $438.93 $0.00 Third Party Stormwater Review Fees - 1st Review $3,477.71 $0.00 $0.00Totals : CONSULTANT:ZEMPEL, TAMMY 1111 CLEVELAND AVE, STE 202 MOUNT VERNON, WA 98273 3604042010 $24,320.74 BLD-2025-0098 RESIDENTIAL SINGLE FAMILY BUILDING ISSUED: EXPIRES: 07/17/2026 07/17/2028 PROJECT NAME: GARY CULBERTSON RESIDENCE SITE ADDRESS: 6210 WESTERN AVENUE ANACORTES Page 1 of 2Printed by : Jennifer Watson on: 07/31/2026 10:06 AM City of Anacortes, WA 904 6th Street Anacortes, WA 98221 (360) 293-1901 http://cityofanacortes.org/ FIXTURES Qty Mechanical Fixtures 3 Air Conditioner / Handler 3 Heat Pump Qty Plumbing Fixtures Please request inspections online through the permit portal. If that is not possible please call (360) 293-1901 for Building or Planning inspections. For Public Works inspections, please call (360) 293-1938. REQUIRED INSPECTIONS Initial BMP's. This stormwater inspection must be completed prior to any other inspections. Sewer Line Storm Drain Connection Footings Perimeter Drains Foundation STORMWATER BMPS 1ST MID PROJECT INSPECTION Underfloor Underground Plumbing Underslab Mechanical Rough-In Gas Piping Plumbing Rough-In Shear Wall and Nailing Framing STORMWATER BMPS 2ND MID PROJECT INSPECTION Insulation Drywall or Lath Cross Connection or backflow assembly verified Permeable Soil Depth CURB FORM INSPECTION CURB FINAL INSPECTION Public Works Final Building Final Stormwater Final Planning Final * The current access from Puget Way will no longer be allowed. The access currently crosses other properties, and there is no easement to your property. With the new proposed driveway from Western Ave, the access from Puget Way must be discontinued and restored with landscaping. * Driveway or graveled areas must not encroach in neighboring properties (HOA to the north or P60637 to the east). * Certificate of occupancy (CO) will not be issued until landscaping improvements have been installed per the approved landscape plan and inspection has been passed. * Drainage Covenant and BMP Maintenance Documents need to be filed with Skagit County. CONDITIONS Page 2 of 2Printed by : Jennifer Watson on: 07/31/2026 10:06 AM City of Anacortes, WA RESIDENTIAL SINGLE FAMILY BUILDING BLD-2025-0098 Green shaded area: New access & utility easement (AFN 202604060003) Red shaded area: Previously established access easement (AFN 624518) AFN 202206060085 Rear Setback 40'-5 to deck Side Setback 37'-6 17,292 Side Setback 54'-6 Side Setback 19'-6 Condition of Approval: The current access from Puget Way will no longer be allowed. The access currently crosses other properties, and there is no easement to your property. With the new proposed driveway from Western Ave, the access from Puget Way must be discontinued and restored with landscaping. CITY OF ANACORTES PCED Dept - Planning DivisionAPPROVED PLANS PERMIT #: PARENT PERMIT #: ADDRESS: APPROVED BY: DATE:07/09/26 BLD-2025-0098 6210 Western Avenue ROW-2025-0027 & BLD-2025-0065 Condition of Approval: Certificate of occupancy (CO) will not be issued until landscaping improvements have been installed per the approved landscape plan and inspection has been passed. Condition of Approval: The current access from Puget Way will no longer be allowed. The access currently crosses other properties, and there is no easement to your property. With the new proposed driveway from Western Ave, the access from Puget Way must be discontinued and restored with landscaping. Condition of Approval: Driveway or graveled areas must not encroach in neighboring properties (HOA to the north or P60637 to the east). AFN 202206060085 Red shaded area: Previously established access easement (AFN 624518) Green shaded area: New access & utility easement (AFN 202604060003) 6,659 SF 38.5% Per the drainage report, the proposed amount of impervious surface is 6,659 SF CITY OF ANACORTES PCED Dept - Planning DivisionAPPROVED PLANS PERMIT #: PARENT PERMIT #: ADDRESS: APPROVED BY: DATE:07/09/26 BLD-2025-0098 6210 Western Avenue ROW-2025-0027 & BLD-2025-0065 See relocation of shed on landscape plan dated March 2026 1111 Cleveland Avenue, Suite 202 Mount Vernon, WA 98273 Phone: (360) 404-2010 Fax: (360)404-2008 May 1, 2026 Aaron Esterholt Stormwater Program Manager City of Anacortes 904 6th Street Anacortes, Washington 98221 Re: 6210 Western Avenue (BLD-2025-0164) Dear Aaron – Please find attached responses to your reviewer’s comment letter regarding the above project, dated October 13, 2025. 1. Looking at the plan set, it is not clear how much of the existing gravel driveway that loops to the north side of the new residence will need to be regraded significantly (up or down) to provide a parking area or access to a basement level or garage (no building plans provided, see snip with red arrow below). The 2019 Ecology Manual defines replaced hard surface as “the removal down to bare soil or base course and replacement.” Assuming a rough finished floor elevation around 88 or 89, it seems like there could either be a good amount of fill or cut required to level out the parking area or cut it down or bring it up to grade as the existing contours show an approximate two-foot drop across the wide west end of the driveway and a grade differential between assumed finished floor of four to six feet. Because the total new hard surface area is near the 5,000 SF threshold, it is possible significant grading could change the answer to question 4 (Figure I- 3.2) to “Yes, the project does add 5,000 SF or more of new hard surfaces”. Please confirm the intention for this area of the site. The gravel will remain at current elevation. I assume the City has the building and foundation plans that accompanied the permit application to share with the reviewer, this will assist in their understanding. I do not have a copy of what has been submitted. Per the City, no additional building or foundation plans have been submitted. You have had access to the foundation plans now, also see photo below that was included in submittal previously. There will be parking underneath the house. Sound Development Group, L.L.C. Engineering, Surveying & Land Development Services Pat Severin, P.E. – 1111 Cleveland Avenue, Suite 202 Mount Vernon, WA 98273 Phone: (360) 404-2010 Fax: (360)404-2008 2. Minimum Requirement #1 Step 1 requires a soils report prepared by a certified professional soil scientist or under the supervision of a suitably trained PE, geologist, etc. The NRCS soil survey gives us a good idea what “might” be there, but a site-specific review is needed to confirm this information including the approximate depth to a restrictive layer that gives credence to the feasibility/infeasibility discussion of Minimum Requirement No. 5.The City no longer accepts the NRCS Soil Survey as a standalone “soils report” without additional site-specific information provided from a credible professional. Pat Severin, P.E. inspected the soils onsite, please see the revised drainage report. It should be advised that this site is approximately 71% impervious historically, with no obvious concentrated flow paths or point discharges, even the 10-15% gravel access roads do not have rills. Additional information was included in the revised including photos of the soil at varying depths. No additional information was included regarding how it justified or conflicted with the NRCS soil survey though it appears to now make infiltration BMPs feasible. Please provide a summary of observations within the report to describe how this information is used in the design. A general summary of soils was provided, please see table on plan sheet 2 within the report. 3. Minimum Requirement No. 3 requires source control BMPs be applied to all projects. Ecology’s 2019 Manual, Volume IV, Section 1 includes items that can be applied to single family residences such as preventative maintenance/good housekeeping. Others that may apply are dust control for the gravel driveway and managing the vegetation. Please review Volume IV and include all applicable BMPs to the project. Several of the Volume 4-1 have been added, there is no Source dust control for single-family residences, per the manual, construction dust control has already been applied. This requirement has been addressed with included BMPs. 4. Minimum Requirement No. 5, List #1: a. Per note 2 above, provide proof of restrictive layer or water table location for infiltration-type BMPs as the NRCS Soil Survey soil description describes a layer of soil between 27 and 60 inches as “very gravelly sandy loam”. See soils test pit and revised plans. Additional information doesn’t describe if a restrictive layer exists. See additional comment on note 2 above. The only restrictive layer found, as seen in the soils test pit table, is the watertable. b. Dispersion across a slope with 15% grade requires geotechnical evaluation. Existing slopes appear to be very close to this and are only showing contours every two feet. So noted. See note 4 on sheet 4. This requirement has been addressed with the slope information included on the resubmitted plan sheet 3 and a revision of the stormwater management plan. c. Per BMP T5.10B, Downspout Splashblock Dispersion may be used if discharging to a vegetated flow path at least 50 feet in length as measure from the downspout to another impervious surface. It appears there is about 11 feet of vegetation between the downspout at the northeast corner of the house and gravel driveway. See revisions. Comment was addressed with changes to how stormwater is managed. d. Per BMP T5.10B, a vegetated flow path of at least 25 feet must be maintained between the edge of a dispersion trench and impervious surface. The plan shows 11 feet from centerline of trench CN#5 and the gravel driveway. 1111 Cleveland Avenue, Suite 202 Mount Vernon, WA 98273 Phone: (360) 404-2010 Fax: (360)404-2008 See revisions. Comment addressed with changes to how stormwater is managed. e. Runoff from the gravel driveways is proposed to be managed via sheet flow dispersion (BMP T5.12). The width of the upper gravel turnaround is 40 feet or so which would require a 20- foot minimum vegetated buffer which will cross the downspout splashblock and downspout dispersion trench areas. Runoff from the east-west leg of the northern driveway is more than 60 feet requiring at least 30 feet of vegetated buffer crossing the lower dispersion trench. Please describe how these vegetated dispersion areas can accommodate runoff from the various impervious surfaces. See revisions, we have addressed new impervious as required; existing impervious will sheetflow/infiltrate/interflow as it has historically. Comment addressed with changes to how stormwater is managed. f. Please revise the feasible/infeasible information for the Roofs and Hard Surfaces for List #1 as the plan appears to show Downspout Full Infiltration and a raingarden on sheets 4, 5, and 7. Also, include design information describing how each utilized system was sized. MR 5 has been updated and sizing criteria added. 5. Minimum Requirement #2, Element 13 states no infiltration BMPs onsite. The plans show a roof infiltration system (construction notes 4 and 9) and a raingarden on sheet 4. Please revise to describe how the infiltration areas will be protected. The report and plans have been updated to reflect future infiltration LID. Please advise if you have further questions or comments. Thank you. Sincerely, Tammy Zempel Tammy Zempel 30'-6 1/2" Backflowprevention device.(See theirrigation plans for make and model).Install the device per the local waterpurveyor's standards and specifications. BACKFLOW PREVENTION DEVICE 4" Galvanized union. Brass ball valve. Threaded galvanizednipple. Galvanized ninetydegree (90°) elbow. Wrap 20 mil tapetwice around allgalvanized pipe underfinished grade andthrough the concrete. 12 " m i n . or p e r l o c a l co d e s . Galvanized nipple. 4" thick concrete pad, 1" above finishedgrade. See backflow cage detail. Concrete thrustblocks required onbackflow devices 2.5"and larger. Galvanized coupling. Galvanized nipple. Note:1- All assembly parts (threaded nipples, fittings, etc.) shall be galvanized or brass per local codes and requirements. 2- Galvanized nipple shall extend 12" past the edge of the concrete footing. 3- Sch. 80 PVC male adapter shall be used in connection from galvanize to the mainline. 4- Backflow prevention device shall be located as close as possible to the landscape meter. 5- Backflow prevention device shall be located in planting area unless approved by Owner's Representative. 6- See detail for backflow cage installation. 7- All backflow prevention devices shall have freeze blanket included upon installation. 8- All galvanized connections shall to be made using pipe thread sealant. All Sch. 80 PVC to galvanized connections to be made using teflon tape. Sch. 80 PVC maleadapter. Flow URBAN TREE FOUNDATION © 2014OPEN SOURCE FREE TO USE I-X POP UP-SPRAY HEAD Spray nozzle or bubbler.(See irrigation legend formake and model). Note:1- 6" pop ups shall be used in turf areas. 2- Contractor shall settle soil around the pop up after installation. 3- All pop up spray heads shall have check valves. 4- All Sch. 40 PVC to Sch. 80 PVC connections shall be made using teflon tape. Top of pop up set atfinish grade. Finish grade. Pop up spray head. (Seeirrigation legend for makeand model). Swing joint. (See detail). Lateral irrigation line. (Seeirrigation plans for size andtype). Sch. 40 PVC tee or elbow. URBAN TREE FOUNDATION © 2014OPEN SOURCE FREE TO USE ROTOR SPRAYHEAD Notes:1- All threaded connection points between Sch. 40 PVC and Sch. 80 PVC fitting shall be installed using teflon tape. 2- Contractor shall compact soil around rotor and riser prior to planting, plugging, seeding, or laying of sod. Pop-up rotor to be set at finish grade. (Seeirrigation legend for make and model). Finished grade. Sch. 80 PVC nipple (optional). Swing joint. See detail. PVC lateral irrigation pipe. (See irrigationplans for pipe size and type). Sch. 40 PVC tee or elbow. URBAN TREE FOUNDATION © 2014OPEN SOURCE FREE TO USE EXISTING SOIL - MINOR MODIFICATION Remove existing turf, thatch,groundcover, plants, orweeds. Finished grade. 6" ± Notes:1- See planting soil specifications for additional requirements. Existing soil. Till top 6" of soil. SECTION VIEW URBAN TREE FOUNDATION © 2014OPEN SOURCE FREE TO USE P-X TREE w/ BERM (EXISTING SOIL NOT MODIFIED) Top of root ball shall be flush withfinished grade. Trunk caliper shallmeet ANSI Z60 currentedition for root ball size. Root ball modified asrequired. Existing soil. Slope sides of loosened soil. Prior to mulching, lightly tamp soilaround the root ball in 6" lifts tobrace tree. Do not over compact.When the planting hole has beenbackfilled, pour water around theroot ball to settle the soil. 4" layer of mulch.No more than 1" of mulch ontop of root ball. (Seespecifications for mulch). Bottom of root ball rests onexisting or recompactedsoil. Central leader. (See crownobservations detail). SECTION VIEW Round-topped soil berm 4" high x 8" wideabove root ball surfaceshall be constructed aroundthe root ball. Berm shallbegin at root ball periphery. Notes:1- Trees shall be of qualityprescribed in crownobservations and rootobservations details andspecifications. 2- See specifications forfurther requirements related tothis detail. Finished grade. 3x widest dimension of root ball. URBAN TREE FOUNDATION © 2014OPEN SOURCE FREE TO USE Loosened soil. Dig and turn thesoil to reduce compaction to thearea and depth shown. P-X TREE STAKING - LODGE POLES (3) SECTION VIEW 6'- 0 " 2'- 0 " Three (3") two inch lodge polestakes. Install approximately 2"away from the edge of the rootball. Stake location shall notinterfere with permanent branches. 32" long non-abrasive rubber ties. PLAN VIEW Rubber tree ties. Lodge pole stakes. Remove nursery stake. Ifcentral leader needs to bestraightened or held erect, it isacceptable to attach a 12" x 8'bamboo pole to the central leaderand trunk. Prevailing wind. URBAN TREE FOUNDATION © 2014OPEN SOURCE FREE TO USE IRRIGATION BUBBLER W/ LAYOUT 18 " m i n . PLAN VIEW SECTION VIEW Pressure compensating bubbler shall beset 1" above finished grade. (Seeirrigation legend for make and model). Swing joint. See detail. Finished grade. Sch. 40 PVC 90° elbow slip to thread. Lateral line irrigation. (See irrigationplans for sizing). Sch. 40 PVC 90° elbow slip to thread. Sch. 40 PVC Tee or 90° elbow. Edge of root ball. Existing or modified soil. (Seespecifications for soil modification). Lateral line irrigation. (See irrigationplans for sizing). Notes:1- All irrigation fittings shall be Sch. 40 PVCunless specified otherwise. 2- All threaded connections from Sch. 40 toSch. 80 PVC shall be made using teflontape. 3- Contractor shall settle the area around thebubbler and edge of the root ball so thatall irrigation flows through the root ball. Edge of root ball. Settle backfill so thatirrigation flows through the root ball. Swing joint. See detail. URBAN TREE FOUNDATION © 2014OPEN SOURCE FREE TO USE LANDSCAPE DETAILS GARY & CAROL CULBERTSON REPURPOSED HOUSE 6210 WESTERN A VENUE ANACORTES. WASHINGTON. 98221 (407) 864-9100 SHRUB - MODIFIED SOIL Notes:1- Shrubs shall be of quality prescribed in the root observations detail and specifications. 2- See specifications for further requirements related to this detail. Modified soil.Depth varies. (Seespecifications for soilmodification). Root ball. 4" high x 8" wide round - topped soilberm above root ball surface shall beconstructed around the root ball.Berm shall begin at root ball periphery. Prior to mulching, lightly tamp soilaround the root ball in 6" lifts to braceshrub. Do not over compact. When theplanting hole has been backfilled, pourwater around the root ball to settle thesoil. 4" layer of mulch.No more than 1" ofmulch on top ofroot ball. (Seespecifications formulch). Root ball rests onexisting orrecompacted soil. Existing soil. Finished grade. Shrub. SECTION VIEW URBAN TREE FOUNDATION © 2014OPEN SOURCE FREE TO USE GROUNDCOVER E Q . EQ . Notes:1- See planting legend for groundcover species, size, and spacing dimension.2- Small roots (14" or less) that grow around, up, or down the root ball periphery are considered anormal condition in container production and are acceptable however they should be eliminated at thetime of planting. Roots on the periperhy can be removed at the time of planting. (See root ball shaving container detail).3- Settle soil around root ball of each groundcover prior to mulching. PLAN SECTION VIEW Pavement. Mulch. Groundcover plants to betriangularly spaced. Existing soil. Modified soil. Depth varies. (Seespecifications for soil modification). 2 - 3" thick layer of mulch. Finished grade. 6" m i n . URBAN TREE FOUNDATION © 2014OPEN SOURCE FREE TO USE 8X 1 2 D F # 2 (3 1 / 2 " X 1 1 7 / 8 " L V L ) 3 1/2" X 14" GL 3 1/2" X 11 7/8" LVL 2X6 DF #2 @ 16" OCFRAMED WALL 8X 1 2 D F # 2 (3 1 / 2 " X 1 1 7 / 8 " L V L ) 8X 1 2 D F # 2 (3 1 / 2 " X 1 1 7 / 8 " L V L ) 8X 1 2 D F # 2 (3 1 / 2 " X 1 1 7 / 8 " L V L ) 6X14 DF#2(3 1/2" X 11 7/8" LVL)6X14 DF#2(3 1/2" X 11 7/8" LVL) 3 1/2" X 14" GL3 1/2" X 14" GL3 1/2" X 14" GL (E ) F L O O R FR A M I N G (E ) F L O O R FR A M I N G (E ) F L O O R FR A M I N G (E ) F L O O R FR A M I N G (E) FLOORFRAMING (E) FLOORFRAMING 3' - 0 " 6' - 0"6' - 0" 3' - 9" 1' - 8" 7' - 0" 3' - 9" 2' - 0 " 9' - 0 " 4' - 1 1 " 4X 1 2 D F # 2 (3 1 / 2 " X 1 1 7 / 8 " L V L ) 3 1 / 2 " X 1 1 7 / 8 " L V L 12" CONCRETE WALLW/ #4 @12" OC EW INSIDEFACE, #5 @9" OC VERT,#4@12 HORIZ OUTSIDEFACE 12" THICK FOOTING W/(7) #5 LONGITUDINALREINF. - (5) T, (2) B,#4@6"OC TRANSVERSEREINF. 8" CONCRETE WALLW/ #4 @ 12" OC EW 12" CONCRETE WALLW/ #4 @12" OC EW INSIDE FACE, #4 @9" OC VERT,#4@18 HORIZ OUTSIDEFACE 12" THICK FOOTING W/(4) #5 LONGITUDINALREINF. - (3) T, (1) B,#4@9"OC TRANSVERSEREINF. 4X 1 2 D F # 2 (3 1 / 2 " X 1 1 7 / 8 " L V L ) 3 1 / 2 " X 1 1 7 / 8 " L V L 12"X24" CONTINUOUSFOOTING W/ (5) #4(3) 2X6 JACKS, (2) 2X6KING, TYP. 14"X30" CONTINUOUSFOOTING W/ (5) #4 T&B 12" CONCRETE WALLW/ #4 @ 12" OC EWEACH FACE 14" THICK FOOTINGW/ #4@12" OC T&BLONGITUDINAL #5 @ 12" OC T&B TRANSVERSE REINF.ALIGN WITH (E) BEARINGWALL ABOVE 12" CONCRETE WALL W/ #4 @ 12" OC EW INSIDE FACE, #5 @5" OC VERT, #4@12 HORIZ OUTSIDE FACE 8" CONCRETE WALLW/ #4 @ 12" OC EW 36"X36"X14" FTG. W/(7) #4 EW, TYP. SEE SRCH ELEVATIONS FOR DOOR AND WINDOW DETAILS FUTURE POSTS 30"X30"X12" FTG. W/(5) #4 EW AND 16"SONOTUBE TO 6" ABOVEFINISHED GRADE (MIN)WITH (4) #4 HOOKEDVERTICALS AND #3 SPIRALHOOPS @ 6" GAUGE,TYP. PLACE SIMPSONCBSQ66 IN CENTER 7' - 0"7' - 0"7' - 0" 10 ' - 0 " 9' - 0 " 2' - 6" 4' - 6 " LINE OF FUTURE DECK 2S2.1 5" SLAB ONGRADE W/ #4 @24" OC EW SLOPE 1"/10'-0" LINE OF FUTURE DECK RETAINING WALL PERSCHEDULE (TYPICAL DETAIL) 8" THICK TAPEREDCONCRETE WING WALLW/ #4@12" OC EW H D WEEP HOLE Lb , T Y P 9" M I N tw (PER PLAN) FOOTING LONGITUDINAL BARS FOOTING TRANSVERSE BARS DRAINAGE WALL VERTICAL REINFORCING, EACH FACE S (PER PLAN) W (PER PLAN) INSIDE FACE OUTSIDE FACE 14"W X12" DP KEYWITH (2) #4 LONG AND#4 X @ 12" OC wilson@raiseps.com © Copyright 2025 Sheet Number: DA T E RE V . BY DE S C R I P T I O N S2.1 CU L B E R T S O N R E S I D E N C E En t e r a d d r e s s h e r e FO U N D A T I O N P L A N 1/4" = 1'-0"1 FOUNDATION PLAN FOUNDATION NOTES 1.2.3. 4. 5. 6.7.8. 9. 10. 11. 12. TOP OF FOOTING ELEVATION 8" BELOW GRADE MINIMUM.8" CONCRETE WALL WITH #4 @ 12" OC EW TYPICAL.FOOTINGS TO BEAR ON COMPETENT NATIVE SOIL OR COMPACTED STRUCTURAL FILL.CARRY POSTS DOWN FROM ABOVE BEARING AND SHEAR WALLS.FOOTINGS TO EXTEND 1'-0" BEYOND END OF WALL TYPICAL.STEP FOOTING AS NECESSARY PER TYPICAL DETAIL.TOP OF FLOOR ELEVATION PER ARCHITECT.REFERENCE ARCHITECTURAL DRAWINGS FOR ALL DIMENSIONS AND ELEVATIONS NOT NOTED.ALL POSTS TO BE DF#2 OR BETTER. DO NOT USE STUD GRADE LUMBER.INDIVIDUAL POSTS NOT IN A WALL TO HAVE SIMPSON CCQ POST BASES AND CAPS.PROVIDE 5/8"x10" AB @ 44" OC WITH 1/4"x3"sq PLATE WASHERS. UNOHDU2 INTO (E) CONCRETE FOUNDATION WITH HIT RE EPOXY WITH 10" MINIMUM EMBEDMENT 1" = 1'-0"2 CANTILEVERED RETAINING WALL FRAMING NOTES 1. 2. 3. 4.5.6. 7. FLOOR SHEATHING 23/32" APA RATED PLYWOOD WITH 10d NAILS @ 6" OC PANEL EDGES, 12" OC FIELD.WALL FRAMING 2x STUDS @ 16" OC UNO. EXTERIOR WALLS TO BE PER SW1 UNO.CARRY POSTS DOWN INTO CRAWLSPACE BEARING SHEAR WALLSTYPICAL HEADER (2) 2x10 PER TYPICAL DETAIL, UNO.TOP OF FLOOR ELEVATION PER ARCHITECT.REFERENCE ARCHITECTURAL DRAWINGS FOR ALL DIMENSIONS AND ELEVATIONS NOT NOTED.ALL POSTS TO BE DF#2 OR BETTER. DO NOT USE STUD GRADE LUMBER. 8.REFER TO TYPICAL DETAILS FOR BUILT-UP POSTS AT HEADERS.9.REFER TO TYPICAL DETAILS FOR BEAM/POST CONNECTION DETAILS.10.STUDS IN BUILT-UP POSTS TO BE CONNECTED TOGETHER W/ 16d NAILS @ 24" OC MIN.11.MIN (1) 2x JACK STUD AND (1) 2x KING STUD AT HEADERS 6' OR LESS AND (2) JACK STUDS AND (1) KING STUD AT HEADERS GREATER THAN 6'.12.SPLICE JOISTS OVER BEARING WALL, BLOCK IN BETWEEN.13.USE SIMPSON HANGERS WHERE NOTED FOR DRAWN.14. HDU2 MAY BE USED IN LIEU OF LSTHD8 HOLD DOWNS15. HDU4 MAY BE USED IN LIEU OF LSTHD10 HOLD DOWNS TYPICAL DETAIL DEVELOPMENT LENGTH (Ld) AND TENSION LAP SPLICE (Lb OR Lbt) db =BAR DIAMETERLd=BOTTOM BAR DEVELOPMENT LENGTHLdt=TOP BAR DEVELOPMENT LENGTHLb=BOTTOM BAR LAP SPLICE LENGTHLbt=TOP BAR LAP SPLICE LENGTHLdh=HOOKED BAR DEVELOPMENT LENGTH LAP SPLICE LENGTH 1. 2. 3. 4. 5.6. NOTES:A TOP BAR IS NORIZONTAL BAR WITH MORE THAN 12" OF FRESH CONCRETE CAST BELOW IT.FOR BEAMS AND COLUMNS WHERE CLEAR COVER IS LESS THAN db OR CLEAR SPACING IS LESS THAN db, MULTIPY VALUES IN TABLE BY 1.5.FOR WALLS AND SLABS WHERE CLEAR COVER IS LESS THAN db OR CLEAR SPACING IS LESS THAN Ddb, MULTIPY VALUES IN TABLE BY 1.5.FOR SPLICING OF DIFFERENT REINFORCEMENT SIZES, USE VALUES FOR SMALLER REINFORCEMENT.FOR #14x AND #18x BAR USE MECHANICAL COUPLERS.MECHANICAL COUPLERS MAY BE USED IN LIEU OF LAP SPLICES, AT CONTRACTORS OPTION. #11x 78 101 131 31 67 87 114 27 60 78 102 24 #10x 70 91 118 28 61 79 102 25 54 71 92 22 #9x 62 81 105 25 54 70 91 22 48 63 81 20 #8x 55 72 93 22 48 62 81 19 43 56 72 17 #7x 48 63 81 20 42 54 71 17 38 49 63 15 #6x 36 48 60 18 33 43 56 17 29 37 49 15 26 34 44 13 #5x 30 40 50 15 28 36 47 14 24 31 41 12 22 28 36 11 #4x 24 32 40 12 22 29 38 11 19 25 33 10 17 23 29 9 #3x 18 24 30 9 17 22 28 9 15 19 25 8 13 17 22 7 Ld(inches)Ldt, Lb(inches)Lbt(inches)Ldh(inches)Ld(inches)Ldt, Lb(inches)Lbt(inches)Ldh(inches)Ld(inches)Ldt, Lb(inches)Lbt(inches)Ldh(inches)Ld(inches)Ldt, Lb(inches)Lbt(inches)Ldh(inches) BAR SIZE 2500 3000 4000 5000 CONCRETE STRENGTH f'c (psi) 2S2.1 2S2.1NO KEY NO KEY 8/13/25 wilson@raiseps.com © Copyright 2025 Sheet Number: DA T E RE V . BY DE S C R I P T I O N S3.1 CU L B E R T S O N R E S I D E N C E En t e r a d d r e s s h e r e TY P I C A L D E T A I L S TYPICAL DETAIL WALL SECTIONS NOTES: 1. SPLICE LEVEL RIM JOIST USING (2) SIMPSON ST6224 STRAPS. 2. AT DOUBLE TOP PLATE, STAGGER SPLICES 2'-0" MIN AND PROVIDE (10) 10d NAILS STAGGERED AND EVENLY SPACED ALONG SPLICE LENGTH. FRAMING PERPENDICULAR TO WALL FRAMING PARALLEL TO WALL SIMPSON LTP4 CONNECTOR @ 24" OC 1-3/4"xCONTINUOUS LVL RIM JOIST WHERE A JOINT OCCURS IN THE PLYWOOD AT THE FLOOR, PROVIDE SIMPSON LTP4 CONNECTORS @ 24" OC SILL PLATE SIMPSON LTP4 CONNECTOR @ 24" OC 1-3/4"xCONTINUOUS LVL RIM JOIST WHERE A JOINT OCCURS IN THE PLYWOOD AT THE FLOOR, PROVIDE SIMPSON LTP4 CONNECTORS @ 24" OC (2) 10d NAILS EA SIDE (2) 10d NAILS EA SIDE BLOCKING TO MATCH WALL STUD SPACING JOIST PER PLAN 2x BLOCKING NAIL PLYWOOD TO BLOCKING PER "PERIMETER" COLUMN OF DIAPHRAGM SCHEDULE; (3) 10d NAILS MIN SILL PLATE JOIST PER PLAN SHEARWALL INTERSECTIONS AND CORNERS AT CORNER AT CORNER SHEATHING BOTH SIDES SHEATHING ONE SIDE EDGE NAILING, REFERENCE SHEARWALL SCHEDULE 3x STUD MIN AT CORNERS EDGE NAILING, REFERENCE SHEARWALL SCHEDULE 3x STUD MIN AT CORNERS SIMPSON A35 @ 9" OC AT INTERSECTIONS AT INTERSECTIONS EDGE NAILING, REFERENCE SHEARWALL SCHEDULE SIMPSON A35 @ 9" OC SHEATHING MUST PASS THROUGH WALL INTERSECTION SIMPSON A35 @ 9" OC EDGE NAILING, REFERENCE SHEARWALL SCHEDULE TYPICAL DETAIL AT DOUBLE TOP PLATE NOTES: 1. MINIMUM PLATE SPLICE IS (16) 16d NAILS FOR 2x PLATES. 2. PROVIDE CONTINUOUS TOP PLATES (NO JOINTS) WHERE PLATES ARE 14'-0" OT LESS IN LENGTH. 3. PLATE BUTT JOINTS TO OCCUR DIRECTLY OVER STUDS. NAILED SPLICE PENETRATION NOTES: 1. MAXIMUM PLATE PENETRATION DIAMETER = PLATE WIDTH -1-1/2" W/ 16d NAILS @ 3" OC STAGGERED 48" SPLICE MIN 16d @ 16" OC 16d @ 16" OC EQ EQ CL PIPE / PLATE PENETRATION AT PLATE PENETRATION GREATER THAN 1-1/2" DIAMETER INSTALL SIMPSON ST2215 STRAP BOTH SIDES TO PROVIDE CONTINUITY PENETRATION MAY NOT OCCUR AT TOP PLATE SPLICE LOCATIONS DOUBLE TOP PLATE STUDS, REFERENCE PLAN AND STUD SCHEDULE TYPICAL DETAIL STAIR STRINGER TYPICAL DETAIL 1-1/8" PLYWOOD TREADS 2x12 STRINGER PER TABLE FOR SPACING SIMPSON L50 EACH SIDE FLOOR BEAM PER PLAN JOIST PER PLAN DOWN RUN NOTES: 1. WHERE FLOOR BEAM SUPPORTIN STAIR STRINGERS IS 4x, USE 2 SIMPSON A34 CLIPS (ONE EACH SIDE OF STAIR STRINGER) IN LIEU OF ONE SIMPSON L50. AT EDGE STRINGERS USE ONE SIMPSON A34 CLIP. 2. INTERMEDIATE SUPPORT FOR STAIR STRINGERS MAY BE PROVIDED TO INCREASE SPACING OF STRINGERS TO 16" MAXIMUM. CONTRACTOR TO PROVIDE PROPOSED LOCATION AND DETAIL OF INTERMEDIATE SUPPORT FOR ENGINEER'S APPROVAL. 3. SEE ARCHITECTURAL DRAWINGS FOR STAIR DIMENSIONS NOT NOTED. UP RUN -WHERE RISERS ALIGN UP RUN -WHERE RISERS ARE OFFSET 1-1/8" PLYWOOD TREADS FLOOR SHEATHING PER PLAN SIMPSON L50 EACH SIDE 2x12 STRINGER, SEE TABLE FOR SPACING FLOOR BEAM PER PLAN JOIST PER PLAN 1-1/8" PLYWOOD TREADS FLOOR SHEATHING PER PLAN SIMPSON L50 2x12 STRINGER, SEE TABLE FOR SPACING FLOOR BEAM PER PLAN JOIST PER PLAN 13 8" OC W/ 2x6 SISTER 11 16" OC W/ 2x6 SISTER 10 8" OC 9 12" OC 7 16" OC NO OF TREADS BETWEEN SUPPORT SPACING STRINGER SPACING TOP OF STEMWALL AT PARALLEL JOIST TYPICAL DETAIL TOP OF STEMWALL AT PERPENDICULAR JOIST MI N6" ANCHOR BOLT PER SHEARWALL SCHEDULE 2x TREATED LEDGER, UNO TJI PER PLANS FLOOR SHEATHING TOP OF FLOOR EL PER PLAN TOP OF WALL EL PER PLAN 8" CONCRETE STEM WALL, UNO 1/ 2 " 1-1/4" RIM BOARD, UNO MI N6" ANCHOR BOLT PER SHEARWALL SCHEDULE 2x TREATED LEDGER, UNO TJI PER PLANS FLOOR SHEATHING TOP OF FLOOR EL PER PLAN TOP OF WALL EL PER PLAN 1/ 2 " 1-1/4" RIM BOARD, UNO 8d @ 3" OC BLOCKING/BRIDGING PER MANUFACTURER (16" OC MIN @ BASEMENT WALLS 6" (2) #4xCONTINUOUS 8" CONCRETE STEM WALL, UNO 6" (2) #4xCONTINUOUS TYPICAL DETAIL TYPICAL DETAIL STEM WALL AND FOOTING CL R 2 1 / 4 " PER PLAN PL A N PE R (3) #4xCONTINUOUS, UNO #4 HORIZONTAL @ 12" OC, UNO 1' - 6 " M I N MA X 24 " . 8" CONCRETE WALL, UNO FINISH GRADE TOP OF WALL EL PER PLAN #4 VERTICAL @ 12" OC, UNO H D WEEP HOLE Lb , T Y P 9" M I N tw (PER PLAN) FOOTING LONGITUDINAL BARS FOOTING TRANSVERSE BARS DRAINAGE WALL VERTICAL REINFORCING, EACH FACE S (PER PLAN) W (PER PLAN) TYPICAL DETAIL CANTILEVERED RETAINING WALL INSIDE FACE OUTSIDE FACE SOIL SIDE TYPICAL DETAIL CANTILEVERED RETAINING WALL SCHEDULE NOTES:1. REINFORCEMENT TO HAVE MINIMUM COVER AS DESCRIBED IN THE GENERAL NOTES.2. FOOTING DOWELS TO MATCH AND BE SPLICED IN THE SAME PLANE AS THE WALL REINFORCING.3. (B) INDICATES COTTOM LONGITUDINAL REINFORCEMENT.4. DRAINAGE AND WEEP HOLES TO BE SPECIFIED BY CIVIL ENGINEER.REINFORCEMENT TO BE PLACED ON OUTSIDE FACE (SOIL SIDE) WHEN ONLY ON (1) MAT CALLED OUT. RW-4 10'-0"10"6'-10"12"4'-2"#4 @ 12" OC #4 @ 6" OC #4 @ 6" OC #5 @ 6" OC RW-3 8'-0"8"5'-4"12"3'-0"#4 @ 16" OC #4 @ 9" OC #4 @ 12" OC #4 @ 9" OC RW-2 6'-0"8"3'-7"12"1'-8"#4 @ 16" OC #4 @ 9" OC #4 @ 12" OC #4 @ 9" OC RW-1 4'-0"8"2'-8"12"1'-0"#4 @ 16" OC #4 @ 9" OC #4 @ 12" OC #4 @ 9" OC HORIZONTAL VERTICAL LONGITUDINAL TRANSVERSEMARKHtwWDSWALL REINFORCING FOOTING REINFORCING CANTILEVERED RETAINING WALL SCHEDULE 2S2.1 2S2.1NO KEY NO KEY 8/13/25 Storm Water Drainage Report Minimum Requirements 1 through 5 Minimum Requirement 1 through 9 ENGINEERING DEPARTMENT 904 6th Street Anacortes, WA 98221 www.anacorteswa.gov Official Use Only: (Information to Inspectors) Required Storm Water Facility and other related requirements: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Project Address: ________________ Submittal Date: __________________ Parcel Number: ________________ Revision Number: ________________ Permit Number: ________________ Reviewer: _______________________ Acceptance Date (COA):____________ FRONT OF REPORT: Submittal Checklist: (All items listed below are required for a complete submittal) o Cover Sheet (Preparer to Provide): Project title, Location, Revision dates, Engineer’s Stamp o TAB 1: Minimum Requirement #1 – Preparation of Stormwater Site Plans o TAB 2: Minimum Requirement #2 – Construction Stormwater Pollution Prevention (SWPP) o TAB 3: Minimum Requirement #3 – Source Control of Pollution o TAB 4: Minimum Requirement #4 – Preservation of Natural Drainage Systems and Outfalls o TAB 5: Minimum Requirement #5 – On-site Stormwater Managements o TAB 6: Minimum Requirement #6 – Runoff Treatment o TAB 7: Minimum Requirement #7 – Flow Control o TAB 8: Minimum Requirement #8 – Wetland Protection o TAB 9: Minimum Requirement #9 – Operation and Maintenance o APPENDIX 1 - Survey performed by a Professional Land Surveyor o APPENDIX 2 - Soils Analysis (Volume 1, Chapter 3.1.1) o APPENDIX 3 - Model Soil Management Plan for BMP T5.13 o APPENDIX 4 - Determining Construction Site Sediment Damage Potential (Appendix 7) o APPENDIX 5 - Site Plan with all applicable information (Minimum Size 11x17 – 30 scale) o APPENDIX 6 - Documented Site Photos (North, South, East and West) o APPENDIX 7 - Drainage BMP Facility Maintenance Covenant, if applicable. To be recorded prior to the Temporary Certificate of Occupancy, Certificate of Occupancy or Final Acceptance. o APPENDIX 8 – Maintenance and Operations Manual and Source Control Stormwater Management Requirements: o Refer to the 2019 Department of Ecology Manual - 2024 manual will be adopted soon o See also, City of Anacortes Municipal Code 19.76 for additional information o See also, current Engineering Development Standards, Chapter 2- Storm Drainage for additional information. Version date: 07/26/24 Page 1 6210 WESTERN AVE P60633 7/13/26 Osborn Consulting 3 6/30/26 Project Description and Summary: Summary Table Existing Proposed Development Type Number of Lots Lot Acreage in SF Soil Type(s) Site Sediment Transport Score (High\Low) Depth to Ground Water Table (Feet and Inches) (See completed Soils Analysis (Volume 1, Chapter 3.1.1) Infiltration Rate during Rainy Season (Inch\Per Hour) Impervious Surface (on-site) Impervious Surface (off-site) New and Replaced Hard Surface Total (SF) Lot Coverage (Percentage) BMP (Required Minimum Requirement 5) BMP T5.13 Post Construction Soils Water Quality Method (Minimum Requirement 6) Water Quantity Method (Minimum Requirement 7) 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 Phasing\Sequence ) ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Developed Conditions Summary: (Additionally, to be shown on the site plan. Identify cut and fill areas, proposed slopes of all hard surfaces , proposed contours) ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ Drainage Basin (2007 Storm Comp Plan – City website\publicworks\engineering\comprehensive plans): What Drainage Basin are you in? _________ Identify any downstream drainage issues (Storm Comp Plan: _________ If so, describe: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Complete the Applicability Requirements – Flow Chart (See next page(s) -Highlight the path and attach -Add a map of where your stormwater goes from your project to the discharge site Version date: 07/26/24 Page 2 REDEVELOPMENT 1 1 17275 17275 Gravelly ashy loam, very gravelly loam, very gravelly sandy loam 1.5-3' deep unknown 12,467 sf 6659 sf 4237 sf 39.7%71.1% not required not required The site was originally covered with an existing pole building, gravel access and parking, several outbuildings and some grass and trees along the west and north property boundary. The slopes on site range from approximately 2-15%. There are no known critical areas on site. Soils onsite will be disturbed for both the new home foundation, the removal of 4358 sf of gravel, and the installation of the new gravel access on the east sid eof the home. Due to the existing slopes, the site will need to be diligent in their TESC and the management of the site construction. See plans for construction sequence. Low The existing arena has previously been removed, a foundation wil be constructed for a house tp be relocated onto the site. A large portion of the existing gravel will be removed and replaced with BMP T5.13 and landscaping, and a loop gravel drive will be constructed to connect to the existing gravel. G2 No City of Anacortes EngineeringPO Box 547, Anacortes, WA 98221 Telephone:360.293.1920 Construction Completion Report In accordance with City of Anacortes (COA) procedures, a Construction Completion Report is required for all approved construction projects. Engineers of Record must submit a Construction Completion Report to the City of Anacortes within twenty (20) days of completion and before use of any third party constructed facilities including; but not limited to grading, streets, sidewalks, water lines, sanitary and storm sewers and related items. Please type or print legibly in ink: ____________________________________________________________________________________ Name of Project or Development ____________________________________ _______________________________________ Owner or Project Contact Name COA Project No. ____________________________________ _______________________________________ Mailing Address Date Construction Documents Approved by COA ____________________________________ City State Zip ____________________________________ _________________________________________ Phone Number E-Mail Address PROJECT NAME AND DESCRIPTIVE TITLE Check one: Entire Project Completed. Description of Portions Completed Complete (Attach additional sheets as needed) PROFESSIONAL ENGINEER’S ACKNOWLEDGEMENT The undersigned professional engineer (PE), or their authorized agent has inspected the above-described project in its entirety and the project has been constructed and is substantially completed in accordance with the construction plans and specifications approved by the COA. In the opinion of the undersigned engineer, the installation, and physical testing procedures were carried out in accordance with COA construction standards and principles of standard engineering practice. I have reviewed the following: disinfection procedures sewer air pressure test pressure test results alignment videos sewer/storm paving/asphalt structures sewer/storm results of the bacteriological test(s) permanent stormwater facilities for this project and certify that they comply with the requirements of the construction standards/specifications approved by the COA. (Check all boxes that apply that are consistent with the nature of this project.) ___________________________________________Date Signed _______________________________________Engineer’s Signature _______________________________________ State/Federal Funding Type (if any) P.E. SEAL Version date: 07/26/24 Page 3 Culbertson SFR Gary Culbertson 13522 Lake Mary Jane Road Orlando, FL 32832 407.864.9100 Figure I-3.2: Flow Chart for Determining Requirements for Redevelopment 2024 Stormwater Management Manual for Western Washington Volume I -Chapter 3 -Page 110Version date: 07/26/24 Page 5 TAB 1 (MINIMUM REQUIREMENT #1) 1-3.4.1 Minimum Requirement #1 – Prepare a Stormwater Site Plan Note: The level of detail needed for each step depends upon the project size. Provide a narrative description of each step. Step 1 – Analyze Existing Stie Conditions to Determine LID Feasibility The existing site analysis is intended to determine the pre-development conditions on the site in addition to determining the appropriateness for use of Low Impact Development (LID) techniques. Site conditions as identified in this step will determine the feasibility of the overall stormwater design including use of LID techniques. The development context shall be established by an existing site analysis consistent with the requirements detailed in this Step. The initial inventory and analysis process will provide baseline information necessary to design strategies that utilize areas most appropriate to evaporate, transpire, and infiltrate stormwater, and achieve the goal of mimicking the pre-development natural hydrologic conditions on the site. The existing site analysis shall include, at a minimum, the following information: 1. A survey prepared by a registered land surveyor, civil engineer, or other qualified professional showing: (See this section for additional items to include) 2.A soils report prepared by a professional soil scientist certified by the Soil Science Society of America (or an equivalent national program), or by other suitably trained persons working under the supervision of a professional engineer, geologist, hydrogeologist, or engineering geologist registered in the State of Washington. _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ Step 2 - Prepare Preliminary Development Layout Based upon the existing site analysis results, locate the buildings, roads, parking lots, landscaping features, LID BMPs, and preliminary location of Runoff Treatment and Flow Control BMPs for the proposed development. Consider the following points when laying out the site: Fit development to the terrain to minimize land disturbance; confine construction activities to the least area necessary, and away from critical areas. Preserve areas with natural vegetation (especially forested areas) as much as possible. On sites with a mix of soil types, locate impervious areas over less permeable soil (e.g., till), try to restrict development over more porous soils or take advantage of them by locating bioretention, rain gardens and/or permeable pavement over them. Cluster buildings together. Minimize impervious areas. Maintain and utilize the natural drainage patterns. _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ Version date: 07/26/24 Page 6 Existing site conditions for this single-family residence were acquired from Public data sources including the City of Anacortes GIS mapping, Google Earth, Skagit county iMap and the USGS. The USGS Web Soil Survey describes the underlying soils as gravelly ashy loams, gravelly loams and very gravelly sandy loams. The soils onsite were verified by Pat Severin, PE. to be course silty sand and coarse sand, all containing rocks and cobbles. As noted in the soils information on the no restrictive layer was found, but the water table. The site layout is pre-determined by the existing pole building pad, access point and building setbacks. Drainage paths, paths will remain the same, and impervious areas have been minimized. _____________________________________________________________________________ _____________________________________________________________________________ Step 3 - Perform Off-site Analysis City of Anacortes requires an off-site analysis for projects that add 5,000 SF or more of new hard surfaces, or convert ¾ acres of vegetation to lawn or landscape areas, or convert 2.5 acres of forested area to pasture. Off-site analysis extends to ¼ mile downstream of the project site. _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ Step 4 – Determine and Read the Applicable Minimum Requirements (Place at the front end of the document before MR#1) I-3.3 Applicability of the Minimum Requirements establishes project thresholds for the application of Minimum Requirements to new development and redevelopment projects. Figure I-3.1: Flow Chart for Determining Requirements for New Development (Included in the report) and Figure I-3.2: Flow Chart for Determining Requirements for Redevelopment (Included in the report) provide the same thresholds in a flow chart format. Based on the preliminary layout, determine whether Minimum Requirements #1 and #2 only apply to the project, or #1 through #5 only apply to the project, or #1 through #9 apply. _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ Step 5 - Prepare a Permanent Stormwater Control Plan (Place in Appendix 5 of this report) (Due to the extent of required information for this section, refer to this section of the Ecology Manual for requirements.) _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ Version date: 07/26/24 Page 7 Not required. Per the redevelopment guidelines and flowchart, MR #1-5 are required. See Appendix 5. Step 6 - Prepare a Construction Stormwater Pollution Prevention Plan (Place in MR#2 – 13 Elements) The Construction SWPPP for projects adding or replacing 2,000 square feet of hard surface or more, or clearing 7,000 square feet or more, must contain sufficient information to satisfy the local government Plan Approval Authority that the potential pollution problems have been adequately addressed for the proposed project. Local governments may adopt a standard SWPPP format for use by projects less than 1 acre. An adequate Construction SWPPP includes a narrative and drawings. The narrative is a written statement to explain and justify the pollution prevention decisions made for a particular project. The narrative contains concise information concerning existing site conditions, construction schedules, and other pertinent items that are not contained on the drawings. The drawings and notes describe where and when the various BMPs should be installed, the performance the BMPs are expected to achieve, and actions to be taken if the performance goals are not achieved. See II-2.4 Preparing Construction SWPPPs for details about what to include in the project's Construction SWPPP. ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ Step 7 - Complete the stormwater site plan The Stormwater Site Plan encompasses the entire submittal to the Local Agency with drainage review authority. Refer to this section of the Manual for further clarification of each item and what is required. See below: A. Project Overview (Front End) B. Existing Conditions Summary (Front End) C. Off-site Analysis Report (Minimum Requirement 1, Step 3) D. Permanent Stormwater Control Plan (Appendix 5) E. Construction Stormwater Pollution Prevention Plan (Minimum Requirement 2) F. Special Reports and Studies (Survey – Appendix 1, Geotechnical – Appendix 2, all others placed after Appendix 8) G. Other Permits, if applicable H. Operation and Maintenance Manual (Appendix 8) I.Declaration of Covenant for Privately Maintained Flow Control and Treatment Facilities. (See attached Drainage BMP Maintenance Covenant BMP Agreement) (Appendix 7) J. Declaration of Covenant for Privately Maintained On-site Stormwater BMP’s (See attached Drainage BMP Maintenance Covenant BMP Agreement) (Appendix 7) K. Bond Quantities Worksheet, if applicable _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ Version date: 07/26/24 Page 8 See appendix 5 See this entire document. Step 8 - Check Compliance with all Applicable Minimum Requirements Before Submitting this report, a Stormwater Site Plan as designed and implemented should specifically fulfill all Minimum Requirements applicable to the project. The Stormwater Site Plan should be reviewed to check that these requirements are satisfied. Note: The report will be returned if determined incomplete. _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ Version date: 07/26/24 Page 9 completed. TAB 2 (MINIMUM REQUIREMENT #2) 1-3.4.2 Minimum Requirement #2 – Construction Stormwater Pollution Prevention Plan (SWPP) All new development and redevelopment projects are responsible for preventing erosion and discharge of sediment and other pollutants into receiving waters. Projects which result in 2,000 square feet or more of new plus replaced hard surface area, or which disturb 7,000 square feet or more of land must prepare a Construction Stormwater Pollution Prevention Plan (SWPPP) as part of the Stormwater Site Plan (see MR1: Preparation of Stormwater Site Plans). Projects below those thresholds (listed above) are not required to prepare a Construction SWPPP, but must consider all of the Construction SWPPP Elements (listed below) and develop controls for all Construction SWPPP Elements that pertain to the project site. General Requirements: The Construction SWPPP shall include a narrative and drawings. All BMPs shall be clearly referenced in the narrative and marked on the drawings. The Construction SWPPP narrative shall include documentation to explain and justify the pollution prevention decisions made for the project. Each of the 13 Construction SWPPP Elements (listed below) must be considered and included in the Construction SWPPP unless site conditions render the Element unnecessary and the exemption from that Element is clearly justified in the narrative of the SWPPP. Clearing and grading activities for developments shall be permitted only if conducted pursuant to an approved site development plan (e.g., subdivision approval) that establishes permitted areas of clearing, grading, cutting, and filling. These permitted clearing and grading areas and any other areas required to preserve critical or sensitive areas, buffers, native growth protection easements, or tree retention areas, shall be delineated on the site plans and the development site. The Construction SWPPP shall be implemented beginning with initial land disturbance and until final stabilization. Sediment and Erosion control BMPs shall be consistent with the BMPs contained in II-3 Construction Stormwater BMPs. Seasonal Work Limitations: From October 1 through April 30, clearing, grading, and other soil disturbing activities shall only be permitted if shown to the satisfaction of the local permitting authority that silt-laden runoff will be prevented 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; and 2. Limitations on activities and the extent of disturbed areas; and 3. Proposed erosion and sediment control measures. 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, and 3. Activities where there is one hundred percent infiltration of surface water runoff within the site in approved and installed erosion and sediment control facilities. Version date: 07/26/24 Page 11 13 Elements of SWPPP (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 2019 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:____________________________________________ Site Address:_____________________________________________ Prepared By:_____________________________________________ The Stormwater checklist or building permit determined that:  The 13 elements must be addressed for construction activity adding under 2,000 sq. ft. of hard surface area.  These elements must be addressed for 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. Under each element, provide the BMP’s that will be applicable to your project. Use the attached Tables provided. 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. Suggested BMPs for Element 1: BMP C101: Preserving Natural Vegetation BMP C102: Buffer Zones BMP C103: High-Visibility Fence BMP C233: Silt Fence How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Version date: 07/26/24 Page 17 Gary Culbertson 6210 Western Avenue SDG - Tammy Zempel X x x BMP C101, 103 and 233. 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. Additional Guidance for Element 2 Minimize construction site access points along linear projects, such as roadways. Street washing may require local jurisdiction approval. Suggested BMPs for Element 2: BMP C105: Stabilized Construction Access BMP C106: Wheel Wash BMP C107: Construction Road / Parking Area Stabilization How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ 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. Version date: 07/26/24 Page 18 BMP C105 and 107 are met onsite with the existing gravel drive and parking area. Additional Guidance for Element 3 Conduct a downstream analysis if changes in flows could impair or alter conveyance systems, streambanks, bed sediment, or aquatic habitat. See III-3.2 Preparing a Stormwater Site Plan for off-site analysis guidelines. Even gently sloped areas need flow controls such as BMP C235: Wattles or other energy dissipation / filtration structures. Place dissipation facilities closer together on steeper slopes. These methods prevent water from building higher velocities as it flows downstream within the construction site. Control structures designed for permanent detention BMPs are not appropriate for use during construction without modification. If used during construction, modify the control structure to allow for long-term storage of runoff and enable sediment to settle. Verify that the BMP is sized appropriately for this purpose. Restore BMPs to their original design dimensions, remove sediment, and install a final control structure at completion of the project. Erosion has the potential to occur because of increases in the volume, velocity, and peak flow rate of stormwater runoff from the project site. The local permitting agency may require infiltration or detention BMP designs that provide additional or different stormwater flow control than the designs detailed in this manual. These requirements may be necessary to address local conditions or to protect properties and waterways downstream. Velocity of water leaving the site should not exceed 3 feet/second, if the discharge is to a stream or ditch. Install velocity dissipation, such as BMP C207: Check Dams or BMP C202: Riprap Channel Lining to ensure reduction of the flow velocity to a non-erosive level. If the discharge from a project site is to a municipal storm drainage system, the allowable discharge rate may be limited by the capacity of the public system. It may be necessary to clean the municipal storm drainage system prior to the start of the discharge to prevent scouring solids from the drainage system. Obtain permission from the owner of the collection system before discharging to it. Ensure that no downstream pipes are surcharged as a result of increased flows from the project site. If the discharge from a project site is directly to a flow control exempt receiving water listed in Appendix I-A: Flow Control Exempt Receiving Waters or to an infiltration system, there is no discharge flow limit. Suggested BMPs for Element 3 BMP C203: Water Bars BMP C207: Check Dams BMP C209: Outlet Protection BMP C235: Wattles BMP C240: Sediment Trap BMP C241: Sediment Pond (Temporary) See also V-12 Detention BMPs How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Version date: 07/26/24 Page 19 No temporary flow control is proposed. 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. Additional Guidance for Element 4 Outlet structures that withdraw impounded stormwater from the surface to avoid discharging sediment that is still suspended lower in the water column are for the construction period only. If installing a floating pump structure, include a stopper to prevent the pump basket from hitting the bottom of the pond. If a sediment trapping BMP utilizes a control structure that will also be used in a permanent detention BMP application, the control structure construction must be finalized for the permanent BMP application upon project completion. Install sediment controls in a manner that protects the sensitive areas and their buffers marked in accordance with Element 1: Preserve Vegetation / Mark Clearing Limits. Where feasible, direct stormwater to vegetated areas to increase sediment removal and maximize stormwater infiltration. Seed and mulch earthen structures such as dams, dikes, and diversions according to the timing indicated in Element 5: Stabilize Soils. Full stabilization includes concrete or asphalt paving; quarry spalls used as ditch lining; or the use of rolled erosion products, a bonded fiber matrix product, or vegetative cover in a manner that will fully prevent soil erosion. The Local Permitting Authority may inspect and approve areas fully stabilized by means other than pavement or quarry spalls. Version date: 07/26/24 Page 20 Suggested BMPs for Element 4: BMP C231: Brush Barrier BMP C232: Gravel Filter Berm BMP C233: Silt Fence BMP C234: Vegetated Strip BMP C235: Wattles BMP C240: Sediment Trap BMP C241: Sediment Pond (Temporary) BMP C250: Construction Stormwater Chemical Treatment BMP C251: Construction Stormwater Filtration How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ 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.  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. Version date: 07/26/24 Page 21 BMP C233 and 235 will be implemented on site. Mulch berms may replace wattles (combination of C231/232). Additional Guidance for Element 5 Soil stabilization BMPs should be appropriate for the time of year, site conditions, estimated duration of use, and potential water quality impacts that stabilization agents may have on downstream waters or ground water. Ensure that gravel base used for stabilization is clean and does not contain fines or sediment. Suggested BMPs for Element 5: BMP C120: Temporary and Permanent Seeding BMP C121: Mulching BMP C122: Nets and Blankets BMP C123: Plastic Covering BMP C124: Sodding BMP C125: Topsoiling / Composting BMP C126: Polyacrylamide (PAM) for Soil Erosion Protection BMP C130: Surface Roughening BMP C131: Gradient Terraces BMP C140: Dust Control How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ 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 slope drains or protected channels to prevent erosion. Temporary pipe slope drains must be sized to convey the flow rate calculated by the one fo the following methods: Single Event Hydrograph Method: The peak volumetric flow rate calculated using a 10-minute time step from a Type 1A, 10-year, 24-hour frequency storm, or; Continuous Simulation Method: The 10-year peak flow rate, as determined by an approved continuous runoff model with a 15-minute time step. 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. Version date: 07/26/24 Page 22 BMP C120, 121, 123, 125 and 140 will be implemented on site as needed. If using the Western Washington Hydrology Model (WWHM) to predict flows, bare soil areas should be modeled as "landscaped" area.  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. Additional Guidance for Element 6 Consider soil type and its potential for erosion. Stabilize soils on slopes, as specified in Element 5: Stabilize Soils. BMP combinations are the most effective method of protecting slopes with disturbed soils. For example, use both BMP C121: Mulching and BMP C122: Nets and Blankets in combination. Suggested BMPs for Element 6: BMP C120: Temporary and Permanent Seeding BMP C121: Mulching BMP C122: Nets and Blankets BMP C123: Plastic Covering BMP C124: Sodding BMP C130: Surface Roughening BMP C131: Gradient Terraces BMP C200: Interceptor Dike and Swale BMP C201: Grass-Lined Channels BMP C203: Water Bars BMP C204: Pipe Slope Drains BMP C205: Subsurface Drains BMP C206: Level Spreader BMP C207: Check Dams BMP C208: Triangular Silt Dike (TSD) How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Version date: 07/26/24 Page 23 BMP C120, 121, 123 will be implemented on site. 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). Additional Guidance for Element 7 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. Keep all approach roads clean. Do not allow sediment and street wash water to enter storm drains without prior and adequate treatment (as defined above) 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. Suggested BMPs for Element 7 BMP C220: Inlet Protection How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ELEMENT 8: Stabilize Channels and Outlets  Design, construct, and stabilize all on-site conveyance channels to prevent erosion from the flow rate calcultated by one the following methods: o Single Event Hydrograph Method: The peak volumetric flow rate calculated using a 10-minute time step from a Type 1A, 10-year, 24-hour frequency storm, or; o Continuous Simulation Method: The 10-year peak flow rate, as determined by an approved continuous runoff model with a 15-minute time step. 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.  Provide stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent streambanks, slopes, and downstream reaches at the outlets of all conveyance systems. Additional Guidance for Element 8 The best method for stabilizing channels is to completely line the channel with BMP C122: Nets and Blankets first, then add BMP C207: Check Dams as necessary to function as an anchor and to slow the flow of water. Version date: 07/26/24 Page 24 No inlets on site. Suggested BMPs for Element 8 BMP C122: Nets and Blankets BMP C202: Riprap Channel Lining BMP C207: Check Dams BMP C209: Outlet Protection How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ELEMENT 9: Control Pollutants Design, install, implement and maintain effective pollution prevention measures to minimize the discharge of pollutants. The project proponent must:  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, or to the sanitary sewer, with local sewer district approval.  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: recycled concrete stockpiles, 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 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 truck drums or concrete handling equipment onto the ground, or into storm drains, open ditches, streets, or streams. Washout of small concrete handling equipment may be Version date: 07/26/24 Page 25 No channels or outlets on site. disposed of in a formed area awaiting concrete where it will not contaminate surface or ground water. Do not dump excess concrete on site, except in designated concrete washout areas. Concrete spillage or concrete discharge directly to ground water or surface waters of the State is prohibited. Do not wash out to formed areas awaiting infiltration BMPs.  Obtain written approval from Ecology before using chemical treatment other than CO2, dry ice, or food grade vinegar to adjust pH.  Uncontaminated water from water-only based shaft drilling for construction of building, road, and bridge foundations may be infiltrated provided the wastewater is managed in a way that prohibits discharge to surface waters. Prior to infiltration, water from water-only based shaft drilling that comes into contact with curing concrete must be neutralized until pH is in the range of 6.5 to 8.5 (su). Additional Guidance for Element 9 Wheel wash and/or tire bath wastewater can be combined with wastewater from concrete washout areas if the wastewaters will be properly disposed of at an offsite location or treatment facility. Do not use upland land applications for discharging wastewater from concrete washout areas. 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 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. Suggested BMPs for Element 9 BMP C151: Concrete Handling BMP C152: Sawcutting and Surfacing Pollution Prevention BMP C153: Material Delivery, Storage, and Containment BMP C154: Concrete Washout Area BMP C250: Construction Stormwater Chemical Treatment BMP C251: Construction Stormwater Filtration BMP C252: Treating and Disposing of High pH Water Also see the Source Control BMPs detailed in Volume IV How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Version date: 07/26/24 Page 26 BMP C151 and C154 will be implemented on site. 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 BMP C240: Sediment Trap or BMP C241: Sediment Pond (Temporary).  Discharge foundation, vault, and trench dewatering water, which have similar characteristics to stormwater runoff at the site, into a controlled conveyance system before discharge to Discharge clean, non-turbid dewatering water, such as well-point ground water, to systems tributary to, or directly into surface waters of the State, as specified in Element 8: Stabilize Channels and Outlets, provided the dewatering flow does not cause erosion or flooding of receiving waters. Do not route clean dewatering water through stormwater sediment BMPs. 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.  Handle highly turbid or otherwise contaminated dewatering separately from stormwater.  Other dewatering 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. Additional Guidance for Element 10 Channels must be stabilized, as specified in Element 8: Stabilize Channels and Outlets. 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 violation of water quality standards for turbidity. The easiest way to avoid discharging muddy water is through infiltration and preserving vegetation. Dewatering water from contaminated sites must be handled separately from stormwater. Direct contaminated stormwater to a sanitary sewer where allowed by the local sewer authority, or to other approved treatment. Suggested BMPs for Element 10 BMP C203: Water Bars BMP C236: Vegetative Filtration How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Version date: 07/26/24 Page 27 Dewatering is not expected onsite 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. Additional Guidance for Element 11 Some temporary erosion and sediment control BMPs are biodegradable and designed to remain in place following construction. BMP C122: Nets and Blankets is an example of a BMP with biodegradable options. 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 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. Suggested BMPs for Element 11 BMP C150: Materials on Hand BMP C160: Certified Erosion and Sediment Control Lead How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ELEMENT 12: Manage the Project  Phase development projects to the maximum degree practicable and take into account seasonal work limitations.  Inspect, maintain and repair all BMPs as needed to assure continued performance of their intended function. Projects regulated under the Construction Stormwater General Permit (CSWGP) must conduct site inspections and monitoring in accordance with Special Condition S4 of the CSWGP.  Maintain, update, and implement the Construction SWPPP.  Projects that disturb one or more acres must have site inspections conducted by a Certified Erosion and Sediment Control Lead (CESCL). Project sites disturbing less than one acre may have a CESCL or a person without CESCL certification conduct inspections. By the initiation of construction, the Construction SWPPP must identify the CESCL or inspector, who must be present on site or on-call at all times. Version date: 07/26/24 Page 28 BMP C150 - contractor will store a minimum of 100' of wattles onsite during construction Additional Guidance for Element 12 The project manager must ensure that the project is built in such a way to comply with all Construction SWPPP Elements, as detailed in this section. Considerations for the project manager include, but are not limited to: construction phasing seasonal work limitations coordination with utilities and other contractors inspection monitoring maintaining an updated construction SWPPP Phasing of Construction Phase development projects where feasible in order to prevent soil erosion and transporting of sediment from the site during construction. Revegetate exposed areas and maintain that vegetation as an integral part of the clearing activities for any phase. Clearing and grading activities for developments shall be permitted only if conducted using an approved site development plan (e.g., subdivision approval) that establishes permitted areas of clearing, grading, cutting, and filling. Minimize removing trees and disturbing or compacting native soils when establishing permitted clearing and grading areas. Show on the site plans and the development site permitted clearing and grading areas and any other areas required to preserve critical or sensitive areas, buffers, native growth protection easements, or tree retention areas as may be required by local jurisdictions. Inspection All BMPs must be inspected, maintained, and repaired as needed to assure continued performance of their intended function. Site inspections must be conducted by a person knowledgeable in the principles and practices of erosion and sediment control. The person must have the skills to 1) assess the site conditions and construction activities that could impact the quality of stormwater, and 2) assess the effectiveness of erosion and sediment control measures used to control the quality of stormwater discharges. For construction sites one acre or larger that discharge stormwater to surface waters of the state, a CESCL must be identified in the construction SWPPP; this person must be on-site or on-call at all times. Certification must be obtained through an approved training program that meets the erosion and sediment control training standards established by Ecology. See BMP C160: Certified Erosion and Sediment Control Lead. Appropriate BMPs or design changes shall be implemented as soon as possible whenever inspection and/or monitoring reveals that the BMPs identified in the Construction SWPPP are inadequate, due to the actual discharge of /or potential to discharge a significant amount of any pollutant. The CESCL or inspector must examine stormwater visually for the presence of suspended sediment, turbidity, discoloration, and oil sheen. They must evaluate the effectiveness of BMPs and determine if it is necessary to install, maintain, or repair BMPs to improve the quality of stormwater discharges. Based on the results of the inspection, construction site operators must correct the problems identified by: Reviewing the Construction SWPPP for compliance with the 13 elements and making appropriate revisions within 7 days of the inspection. Immediately beginning the process of fully implementing and maintaining appropriate source control and/or treatment BMPs as soon as possible, addressing the problems no later than within 10 days of the inspection. If installation of necessary treatment BMPs is not feasible within 10 days, the construction site operator may request an extension within the initial 10-day response period. Documenting BMP implementation and maintenance in the site log book (applies only to sites that have coverage under the Construction Stormwater General Permit). Version date: 07/26/24 Page 29 The CESCL or inspector must inspect all areas disturbed by construction activities, all BMPs, and all stormwater discharge points at least once every calendar week and within 24 hours of any discharge from the site. (For purposes of this condition, individual discharge events that last more than one day do not require daily inspections. For example, if a stormwater pond discharges continuously over the course of a week, only one inspection is required that week.) The CESCL or inspector may reduce the inspection frequency for temporary stabilized, inactive sites to once every calendar month Maintaining an Updated Construction SWPPP Retain the Construction SWPPP on-site or within reasonable access to the site. Modify the Construction SWPPP whenever there is a change in the design, construction, operation, or maintenance at the construction site that has, or could have, a significant effect on the discharge of pollutants to waters of the state. The Construction SWPPP must be modified if, during inspections or investigations conducted by the owner/operator, or the applicable local or state regulatory authority, it is determined that the Construction SWPPP is ineffective in eliminating or significantly minimizing pollutants in stormwater discharges from the site. Modify the Construction SWPPP as necessary to include additional or modified BMPs designed to correct problems identified. Complete revisions to the Construction SWPPP within seven (7) days following the inspection. Suggested BMPs for Element 12 BMP C150: Materials on Hand BMP C160: Certified Erosion and Sediment Control Lead BMP C162: Scheduling How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ELEMENT 13: Protect Low Impact Development BMPS The primary purpose of On-Site Stormwater Management is to reduce the disruption of the natural site hydrology through infiltration. BMPs used to meet I-3.4.5 MR5: On-Site Stormwater Management (often called LID BMPs) are permanent facilities.  Protect all LID BMPs (including, but not limited to BMP T7.30: Bioretention, BMP T5.14: Rain Gardens, and BMP T5.15: Permeable Pavements) from sedimentation through installation and maintenance of erosion and sediment control BMPs on portions of the site that drain into the LID BMPs. Restore the BMPs to their fully functioning condition if they accumulate sediment during construction. Restoring the BMP must include removal of sediment and any sediment-laden Bioretention/Rain Garden soils, and replacing the removed soils with soils meeting the design specification.  Maintain the infiltration capabilities of LID BMPs by protecting against compaction by construction equipment and foot traffic. Protect completed lawn and landscaped areas from compaction due to construction equipment.  Control erosion and avoid introducing sediment from surrounding land uses onto BMP T5.15: Permeable Pavements. Do not allow muddy construction equipment on the base material or pavement. Do not allow sediment-laden runoff onto permeable pavements or base materials. Version date: 07/26/24 Page 30 BMP C150 - contractor will store a minimum of 100' of wattles onsite during construction  Permeable pavement fouled with sediments or no longer passing an initial infiltration test must be cleaned using procedures in accordance with this manual or the manufacturer’s procedures.  Keep all heavy equipment off existing soils under LID BMPs that have been excavated to final grade to retain the infiltration rate of the soils. Additional Guidance for Element 13 See Chapter 5: Precision Site Preparation, Construction & Inspection of LID Facilities in the LID Technical Guidance Manual for Puget Sound (Hinman and Wulkan, 2012) for more detail on protecting LID integrated management practices. Note that the LID Technical Guidance Manual for Puget Sound (Hinman and Wulkan, 2012) is for additional informational purposes only. You must follow the guidance within this manual if there are any discrepancies between this manual and the LID Technical Guidance Manual for Puget Sound (Hinman and Wulkan, 2012). Suggested BMPs for Element 13 BMP C102: Buffer Zones BMP C103: High-Visibility Fence BMP C200: Interceptor Dike and Swale BMP C201: Grass-Lined Channels BMP C207: Check Dams BMP C208: Triangular Silt Dike (TSD) BMP C231: Brush Barrier BMP C233: Silt Fence BMP C234: Vegetated Strip How did you comply with this section? ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ___________________________________________ _____________________ Applicant Signature Date Version date: 07/26/24 Page 31 LID areas are currently covered with shot rock/gravel section, over existing topsoil, or gravel bottom barn/shed area. These areas will be left in their current state until installation. Tammy Zempel 05.02.26 TAB 3 (MINIMUM REQUIREMENT #3) 1-3.4.3 Minimum Requirement #3 – Source Control of Pollution All known, available and reasonable source control BMP’s must be applied to all projects. Source control BMP’s must be selected, designed, maintained according to the reference Ecology Manual. The intent of source control BMP’s is to prevent stormwater from coming in contact with pollutants. They are a cost-effective means of reducing pollutants in stormwater and should be considered in all projects. Supplemental Guidelines Source Control BMPs include Operational BMPs and Structural Source Control BMPs. See Volume IV for design details of these BMPs. For construction sites, see II-3.2 Construction Source Control BMPs. Structural Source Control BMPs should be identified in the stormwater site plan and should be shown on all applicable plans submitted for local government review and approval. An adopted and implemented Basin Plan (see Appendix I-B: Basin Plans) or Total Maximum Daily Load (see I-2.13 Total Maximum Daily Loads (TMDLs)) may be used to develop more stringent source control requirements that are tailored to a specific basin. Identifying Source Control Strategies in a Basin Plan Basin Plans can identify potential sources of pollution within the basin and develop strategies to eliminate or control these sources to protect beneficial uses. A Basin Plan can include the following Source Control strategies: 1. Detection and correction of illicit discharges to storm sewer systems, including the use of dry weather sampling and dye-tracing techniques; 2. Identification of existing businesses, industries, utilities, and other activities that may store materials susceptible to spillage or leakage of pollutants into the storm sewer system or to the ground via wells, drains, or sumps; 3. Elimination or control of pollutant sources identified in (2); 4. Identification and control of future businesses, industries, utilities, and other activities which may store materials susceptible to spillage or leakage of pollutants into the storm sewer system; and 5. Training and public education A Basin Plan that incorporates the standard requirements from this section as well as more stringent requirements does not require Ecology approval. What Source Control BMP’s are applicable to your project? __________________________________________________________________________________ __________________________________________________________________________________ __________________________________________________________________________________ __________________________________________________________________________________ __________________________________________________________________________________ __________________________________________________________________________________ Version date: 07/26/24 Page 32 The site is a single family residence, there are no expected source control requirements. the site is connected to sanitary sewer, public water, and all wast will be disposed of in trash receptacles. Per the City of Anacortes, the owner shall adhere to the following: S102 - BMP's for preventative maintenance and good housekeeping; S104 - BMP's for spill prevention and cleanup; S108 - BMP's for Correcting illicit discharges to storm drains. TAB 4 (MINIMUM REQUIREMENT #4) 1-3.4.4 Minimum Requirement #4 – Preservation of Natural Drainage Systems and Outfalls Natural drainage patterns shall be maintained and discharges from the project shall occur at the natural location, to maximum extent practicable. The manner by which runoff is discharged from the project site must not cause a significant adverse impact to downstream receiving waters and down gradient properties. All outfalls require energy dissipation. The objective is to preserve and utilize drainage systems to the fullest extent because of the multiple stormwater benefits these systems provide; and to prevent erosion at the downstream of the discharge location. Refer to the referenced section of the manual for supplemental guidelines and additional information under this section. Will this project disturb the Natural Drainage System or Outfall of the project Site? Yes\No. If yes, refer to section I-3.4.4 for Supplemental Guidelines for additional information. Version date: 07/26/24 Page 33 Version date: 07/26/24 Page 34 TAB 5 (MINIMUM REQUIREMENT #5) 1-3.4.5 Minimum Requirement #5 – On-site Stormwater Management Projects shall employ Stormwater Management BMPs in accordance with the following thresholds, standards, and lists to infiltrate, disperse, and retain stormwater runoff on site to the extent feasible without causing flooding or erosion impacts. Project thresholds that trigger Minimum Requirements #1 through #5, shall utilize the On-site Stormwater Management BMP’s from List #1 for all surfaces within each type of surface in List #1; or, Demonstrate compliance with the LID Performance Standard. Projects selecting this option cannot use Rain Gardens. They may choose to use Bioretention BMP’s as described in Chapter V-7 – Infiltration and Bioretention Treatment Facilities to achieve the LID Performance Standard. Refer to this section of the reference Manual for all Feasibility or Infeasibility Criteria for List #1 and List #2. Is this project Flow Control Exempt? ______ (Yes\No) (See Appendix I-E: Flow Control-Exempt Surface Water). If yes, provide reasoning from the applicability section of 1-2.5.7 Minimum Requirement #7: Flow Control). If No, then the project triggers Minimum Requirement #7 (1-2.5.7) and possibly Minimum Requirement #8 (1-2.5.8). __________________________________________________________________________________ __________________________________________________________________________________ __________________________________________________________________________________ __________________________________________________________________________________ __________________________________________________________________________________ If the project is Flow Control Exempt, select from the List 3 below: (Skip List 1 and List 2) o BMP T5.13 Post Construction Soils Quality and Depth Roofs: o BMP T5.10A: Downspout Full Infiltration, or; o BMP T5.10B Downspout Dispersion Systems, or; o BMP T5.10C: Performated Stub-out Connections, or; Other Hard Surfaces: o BMP T5.12: Sheet Flow Dispersion, or; o BMB T5.11: Concentrated Flow Dispersion LID Performance Standard The LID Performance Standard compliance method for Minimum Requirement #5 requires modeling the proposed Flow Control BMPs to demonstrate the flow reduction as described below. Note that in order to meet the LID Performance Standard, the chosen Flow Control BMPs will most likely need to include infiltration. Stormwater discharges shall match developed discharge durations to pre-developed durations for the range of pre-developed discharge rates from 8% of the 2-year peak flow to 50% of the 2-year peak flow. Refer to the Flow Control Performance Standard section in I-3.4.7 MR7: Flow Control for information about the assignment of the pre-developed condition. Project sites that must also meet I-3.4.7 MR7: Flow Control must match flow durations between 8% of the 2-year flow through the full 50-year flow. Designers selecting this option cannot use BMP T5.14: Rain Gardens to achieve the LID Performance Standard. They may choose to use BMP T7.30: Bioretention to achieve the LID Performance Standard. Version date: 07/26/24 Page 35 No The site is not flow control exempt, paragraph above is incorrect, as MR #7 is not triggered. The site meets the TDA threshold, MR #7 is not required. The List Approach The List Approach compliance method for Minimum Requirement #5 requires evaluating the BMPs in Table I-3.2: The List Approach for MR5 Compliance. For each surface, evaluate the feasibility of the BMPs in the order listed, and use the first BMP that is considered feasible. The designer must document the site conditions and infeasibility criteria used to deem BMPs infeasible. Once a BMP is deemed feasible and used for a surface, no other BMP from the list is necessary for that surface. If all BMPs in the list are infeasible, then the designer must document the site conditions and infeasibility criteria used to deem each BMP infeasible. This documentation will demonstrate compliance with Minimum Requirement #5. Feasibility shall be determined by evaluation against: Design criteria, limitations, and infeasibility criteria identified for each BMP in this manual; and Competing Needs Criteria as listed below. ______________________________________________________________________________________ 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. See Appendix 3 for the “Model Soil Management Plan for BMP T5.13” to be submitted with Drainage Report and Application Material. An alternate document acceptable to the City of Anacortes is a Test Report provided by the Soils Supplier that identifies the soils to be used meet the specifications outlined under Minimum Requirement 5. The specifications are in both WSDOT and CSI Formats. For specifications, refer to the above referenced PDF. This submittal can be a deferred submittal since most projects are not sure who the supplier will be at the time of building permit application. For projects that trigger Minimum Requirements 1 through 5, the Test Report will be provided to the Building Department. Projects triggering Minimum Requirements 1 through 9, the Test Report will be provided to the Engineering Department. Version date: 07/26/24 Page 36 List #1 – Project Triggering Minimum Requirement 1 through 5 For each surface, consider the BMPs in the order listed for that type of surface. Use the first BMP that is considered feasible. No ther On-site Stormwater Management BMP is necessary for that surface. Provide feasible detail under each BMP with maintenance and operations specifications in Minimum Requirement 5. Roofs: List #1 1.BMP T5.30: Full Dispersion (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ Or, T5.10A: Downspout Full Infiltration (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 2.BMP T5.14: Rain Gardens (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ Or, BMP T7.30: Bioretention Cells, Swales, and Planter Boxes (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 3. BMP T5.10B: Downspout Dispersion Systems (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 4. BMP T5.10C: Perforated Stub-out Connections (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ Version date: 07/26/24 Page 37 Infeasible, the site does not have the undeveloped area to provide. Feasible, the project will infiltrate the stormwater runoff utilizing BMP T5.10A. The northeast fdownspout will infiltrate at the northeast corner of the site, while the remaining roof will infiltrate at the northwest. The soils were verified to be coarse sands with some silt and cobbles. 25 lf of infiltration trench per 1000 sf of roof was utilized. Other Hard Surfaces: List #1 1. BMP T.5.30 Full Dispersion (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 2.BMP T5.15: Permeable Pavements (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ Or, BMP T.14: Rain Gardens (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ Or, BMP T7.30: Biorention Cells, Swales and Planter Boxes (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 3.BMP T5.12: Sheet Flow Dispersion (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ Or, BMP T5.11: Concentrated Flow Dispersion (Feasible\Infeasible) If infeasible, provide the criteria: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ ___________________________________________ _____________________ Applicant Signature Date Version date: 07/26/24 Page 38 Infeasible, the site does not have the undeveloped area to provide. The site will not be paved. Feasible, an overflow has been provided that will disperse via via sheet flow dispersion trench. Tammy Zempel 05.02.26 Feasible. A rain garden/biofiltration cell will be provided. An overflow is provided to a sheet flow dispersion trench. The cell was sized to meet the 5% of contributing HS area and 2% of the landscaping. (667 sf (X .02) of landscaping and 1622 of new and existing onsite gravel (1622 X 0.05) (13.3+81.1 = 94.4 sf water surface area - 98 sf provided) IF offsite runoff enters the bioretention cell rather than interflowing or infiltrating, it will be discharged through the overflow. With the sand and cobble soils, no offsite runoff is expected. APPENDIX 1 – Survey performed by a Professional Land Surveyor The object of this appendix is to ensure that the property has a minimum of 3 out of 5 property corners visible to ensure that the structures are placed within the required setbacks. Version date: 07/26/24 Page 47 No survey was completed for this drainage report. Surveys attached show that Skodje corners were located on most corners, but no recorded survey for those corners were located. UNO F F I C I A L D O C U M E N T UNO F F I C I A L D O C U M E N T APPENDIX 2 – Soils Anaylsis (Volume 3, Chapter 3.3.2) Provide the soils report in this appendix Version date: 07/26/24 Page 48 See sheet 3 of the plans for test pit soils discovered. Hydrologic Soil Group—Skagit County Area, Washington (CULBERT) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/25/2025 Page 1 of 4 53 7 2 1 4 0 53 7 2 1 5 0 53 7 2 1 6 0 53 7 2 1 7 0 53 7 2 1 8 0 53 7 2 1 9 0 53 7 2 2 0 0 53 7 2 2 1 0 53 7 2 1 4 0 53 7 2 1 5 0 53 7 2 1 6 0 53 7 2 1 7 0 53 7 2 1 8 0 53 7 2 1 9 0 53 7 2 2 0 0 53 7 2 2 1 0 522880 522890 522900 522910 522920 522930 522940 522950 522960 522970 522980 522990 522880 522890 522900 522910 522920 522930 522940 522950 522960 522970 522980 522990 48° 30' 9'' N 12 2 ° 4 1 ' 2 5 ' ' W 48° 30' 9'' N 12 2 ° 4 1 ' 1 9 ' ' W 48° 30' 6'' N 12 2 ° 4 1 ' 2 5 ' ' W 48° 30' 6'' N 12 2 ° 4 1 ' 1 9 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 10N WGS84 0 25 50 100 150 Feet 0 5 10 20 30 Meters Map Scale: 1:589 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Skagit County Area, Washington Survey Area Data: Version 24, Aug 27, 2024 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Aug 14, 2022—Sep 1, 2022 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Hydrologic Soil Group—Skagit County Area, Washington (CULBERT) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/25/2025 Page 2 of 4 Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 30 Clallam gravelly loam, 8 to 15 percent slopes C 1.2 100.0% Totals for Area of Interest 1.2 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Hydrologic Soil Group—Skagit County Area, Washington CULBERT Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/25/2025 Page 3 of 4 Tie-break Rule: Higher Hydrologic Soil Group—Skagit County Area, Washington CULBERT Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/25/2025 Page 4 of 4 Map Unit Description The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions in this report, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named, soils that are similar to the named components, and some minor components that differ in use and management from the major soils. Most of the soils similar to the major components have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Some minor components, however, have properties and behavior characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Map Unit Description---Skagit County Area, Washington CULBERTSON Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/25/2025 Page 1 of 4 Soils that have profiles that are almost alike make up a soil series. All the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of a given series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. Additional information about the map units described in this report is available in other soil reports, which give properties of the soils and the limitations, capabilities, and potentials for many uses. Also, the narratives that accompany the soil reports define some of the properties included in the map unit descriptions. Report—Map Unit Description Skagit County Area, Washington 30—Clallam gravelly loam, 8 to 15 percent slopes Map Unit Setting National map unit symbol: 2hvd Elevation: 30 to 500 feet Map Unit Description---Skagit County Area, Washington CULBERTSON Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/25/2025 Page 2 of 4 Mean annual precipitation: 23 inches Mean annual air temperature: 48 degrees F Frost-free period: 160 to 200 days Farmland classification: Farmland of statewide importance Map Unit Composition Clallam and similar soils:90 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Clallam Setting Landform:Hillslopes Parent material:Glacial drift Typical profile H1 - 0 to 11 inches: gravelly ashy loam H2 - 11 to 27 inches: very gravelly loam H2 - 27 to 60 inches: very gravelly sandy loam Properties and qualities Slope:8 to 15 percent Depth to restrictive feature:20 to 40 inches to densic material Drainage class:Moderately well drained Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.06 in/hr) Depth to water table:About 18 to 36 inches Frequency of flooding:None Frequency of ponding:None Available water supply, 0 to 60 inches: Very low (about 2.6 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 4s Hydrologic Soil Group: C Ecological site: F002XA001WA - Puget Lowlands Dry Forest Forage suitability group: Limited Depth Soils (G002XN302WA) Other vegetative classification: Limited Depth Soils (G002XN302WA) Hydric soil rating: No Minor Components Coveland Percent of map unit:5 percent Landform:Depressions Other vegetative classification:Wet Soils (G002XN102WA) Hydric soil rating: Yes Bow Percent of map unit:5 percent Landform:Terraces Map Unit Description---Skagit County Area, Washington CULBERTSON Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/25/2025 Page 3 of 4 Other vegetative classification:Seasonally Wet Soils (G002XN202WA) Hydric soil rating: Yes Data Source Information Soil Survey Area: Skagit County Area, Washington Survey Area Data: Version 24, Aug 27, 2024 Map Unit Description---Skagit County Area, Washington CULBERTSON Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/25/2025 Page 4 of 4 APPENDIX 3 – Model Soil Management Plan for BMP T5.13 An alternate document acceptable to the City of Anacortes is a Test Report provided by the Soils Supplier that identifies the soils to be used meet the specifications outlined under Minimum Requirement 5. The specifications are in both WSDOT and CSI Formats. For specifications, refer to the above referenced PDF. This submittal can be a deferred submittal since most projects are not sure who the supplier will be at the time of building permit application. The form needs to be uploaded to your SmartGov account. Version date: 07/26/24 Page 49 Please defer this submittal. DEFERRED SUBMITTAL: PROVIDE A TEST REPORT FROM SOILS SUPPLIER TO THE BUILDING DEPT. 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 ___ Subsoil will be scarified ___ inches (depth) of scarification needed to achieve finished total 12” loosened depth. PRE-APPROVED AMENDMENT METHOD: ___ Topsoil import ___ Amend with compost ___ Stockpile and amend ( ____ cu. yds. stockpiled) ____inches of compost or imported topsoil applied X 3.1 (conversion factor, inches to cubic yards) _____= cu. yards per 1,000 sq. ft. X ___ ,000s sq.ft. in this area ____ = cubic yards of amendment → → → → → (needed to cover this area to designated depth) PRODUCT:_________________________ __________________________________ QUANTITY:________CU. YDS. CUSTOM AMENDMENT ___ Topsoil import ___ Topsoil & compost lift ___ Amend ___ Stockpile and amend (____ cu. yds. stockpiled) Attach test results and calculations. ____ inches organic matter or topsoil import X 3.1 _____= cu. yards / 1,000 sq. ft. X ___ ,000s sq.ft. in this area ____ = cubic yards of amendment → → → → → PRODUCT:_________________________ __________________________________ QUANTITY:________CU. YDS. MULCH ___ ,000 sq.ft. X 6.2 (conversion, to give 2 inch mulch depth) ____ = cubic yards of mulch → → → → → → PRODUCT:_________________________ 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: 07/26/24 Page 50 APPENDIX 4 – Determining Construction Site Sediment Damage Potential (Appendix 7 – NPDES Phase II Permit) Note: See attached. All projects within the City of Anacortes are required to complete that document under Appendix 4. Version date: 07/26/24 Page 51 Western Washington Phase II Stormwater Permit i.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. ii.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. iii.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: 07/26/24 Page 52 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. Version date: 07/26/24 Page 53 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............................................................................................. 1 If no surface or groundwater enters site, give 0 points. Version date: 07/26/24 Page 54 Use 22 82 APPENDIX 5 – Site Plan with all applicable information (Minimum Size 11x17 at a legible scale) Version date: 07/26/24 Page 55 32226 BLD-2025-0164 32226 SF VEG PS PS VEG DC DC PC PC 32226 CW CW EG EG TBR VEG VEG VEG PS PS PS PS DC DC DCTBR TBR TBR TBR TBR SF SF SF CRS CRS EG EG EG EG EG CW PC 32226 32226 BMP T5.13: POST-CONSTRUCTION SOIL QUALITY AND DEPTH 32226 32226 32226 32226 32226 APPENDIX 6 – Documented Site Photos (Show all directions of the site, including frontage) (Insert Photo Here) Location: Description of the photo: Photo taken by: Version date: 07/26/24 Page 56 Soil profile grab from 1.2’-2’ depth Soil grab from 2’- 3.5’ soil grab from 3.5’ to 5.7’ Looking west Looking south from nw corner Looking SE from NW corner (you can see the area where the RV will be parked under the house and the Pit area/excavation) APPENDIX 7 – Drainage BMP Facility Maintenance Covenant Note: To be recorded prior to: 1) Temporary Certificate of Occupancy; 2) Final Certificate of Occupancy, and or; 3) Final Acceptance of the project. This is Covenant is required for any Permanent Stormwater Facility constructed on a project site. The applicant should work with the the City of Anacortes Engineering Department on formalizing the document for recording. Version date: 07/26/24 Page 57 Return Address: City of Anacortes Planning and Community Development 904 6th Street Post Office Box 547 Anacortes, WA 98221 Drainage BMP Facility Maintenance Covenant Grantor(s) hereinafter referred to as Grantor: 1. ________________________________ Grantee: City of Anacortes, hereinafter referred to as the City, a Political Subdivision under the Laws of the State of Washington. Legal Description of property encumbered by covenant: Abbreviated: Survey recorded under ____________________. See attached Exhibit A for abbreviated Legal Description. Common Name of the Development of the property encumbered by covenant: ___________________________________________ Located in ___ qtr. Sec. ___ Twp. ___., Rge. ______. Reference Number(s) of documents assigned, released, or modified: N/A Assessor's Property Tax Parcel/Account Number(s) of property(s) encumbered by the drainage covenant: _______________________ Page 1 Grantor's Initials ___ Version date: 07/26/24 Page 59 Grantor has a record interest in the property encumbered by the covenant and agrees that the obligations of Grantor shall inure to the benefit of and be binding upon the heirs, successors, and assigns. Grantor agrees that this covenant touches and concerns the land described in Page 1 of this agreement and shall run with the land. Grantor by execution of this covenant acknowledges that the benefits of this covenant inure to Grantor, downstream property owners , and the general public, and that the City as third-party beneficiary of this covenant has the right, but not the obligation, to enforce this covenant on behalf of downstream property owners and the general public. The City requires this covenant to protect private and public property, private and public drainage infrastructure, and natural resources of downstream property owners and the general public. Grantor in consideration of the approval of the City development permit No. ____________________, relating to the real property described on Page 1 and in consideration of other valuable consideration, receipt and sufficiency of which is hereby acknowledged, hereby covenants to perform regular inspections upon the drainage facilities installed, or to be installed, upon Grantor's property. These inspections shall compare the facility/BMP device to the standards described in the current Stormwater Management Manual for Western Washington in use by the City of Anacortes (herein referred to as “the Manual”) for all elements of the stormwater drainage system. For any BMP facility approved by the City but not included in the Manual; maintenance standards shall be as described in the manufacturer’s operation and maintenance manual; which shall also be referred to as the Manual. As applicable, the system shall include the stormwater conveyance pipes, ditches , swales, and catch basins; stormwater flow regulation system detention ponds, vaults, pipes, retention ponds, flow regulation and control structures; infiltration systems and all other stormwater quality or flow control system. The inspections conducted on all facility/BMPs shall be performed by qualified personnel who have received professional training in the aspects of stormwater management for which they are responsible to inspect. For example a person qualified to perform an inspection on a detention pond must demonstrate that they have received professional training specifically on detention pond maintenance and compliance with standards. The City shall request a record of the inspection annually. The Grantor shall provide to the City a written record of the inspection performed and the condition of the facility/BMP upon request. The record shall provide an explanation of each maintenance component and potential defect identified in the maintenance standards in the Manual for each specific BMP/facility. Where measurements must be taken to (trash or debris exceeds 60% of the sump…) the actual field measurements must be included on the report. Pictures of each BMP facility shall be included, and the date(s) of the inspections must be clearly identified. Version date: 07/26/24 Page 60 The scope of this covenant and right of entry shall be adequate to provide for the access, inspection, and maintenance of the stormwater drainage system, and shall be subject to the following terms and conditions: 1.The City shall have the perpetual right of entry across adjacent lands of the Grantor for purposes of inspecting, auditing, or conducting required maintenance of the drainage BMP facility. 2.The facility specific maintenance standards contained in the Manual are intended to be conditions for determining if maintenance actions are required. The standards are not intended to be a measure of the facility’srequired condition at all times. Discovery through inspection that a facility’scondition is in exceedance of a standard does not constitute a violation of this agreement. 3.Should a facility be discovered in a condition that constitutes an exceedance ofany described standard, maintenance shall be performed on the following schedule: a.Within nine months for typical maintenance of facilities, except catch basins.b.Within three months for catch basins.c.Within eighteen months for any maintenance that requires capital construction or expenditure over $25,000 4.In the event that Grantor fails to complete the required maintenance within theidentified time period, the City shall have the right to immediately and withoutfurther notice perform or contract with others to perform all maintenancenecessary to return the facility/BMP to compliance with the standard. This workshall be performed at the sole expense of the Grantor. 5.If the City in its sole discretion determines that an imminent or present dangerexists, that any condition exists that could constitute a threat to human health,welfare or the environment, or any condition exists that could cause the City to be found in violation of the Western Washington Phase II Municipal StormwaterNPDES permit issued to the City of Anacortes, or any other environmentalpermit, the City may take any action required including beginning maintenance or repairs immediately at Grantor's expense without prior notice to Grantor. Insuch event, the City shall provide Grantor with a written statement andaccounting of all work -performed and the fees, charges, and expenses incurred in making such repairs. Grantor shall agree to reimburse the City orpay the City's vendors directly for all reasonable fees, charges, and expensesidentified in the City's statement. 6.If the City is required to act as a result of Grantor's failure to comply with this covenant, the City may remove any obstructions and/or interferences that in the sole opinion of the City impair the operation of the drainage BMP facility orthe maintenance thereof. Grantor agrees to hold the City, its officers, Version date: 07/26/24 Page 61 employees, and agents harmless from any and all claims, actions, suits, liability, loss, expenses, damages and judgments of any nature whatsoever, including costs and attorney's fees, incurred by the removal of vegetation or physical interference from the drainage BMP facility. 7.When exercising the maintenance provisions of the covenant, in the event of nonpayment, the City may bring suit to recover such costs, including attorney's fees, and upon obtaining a judgment, such amount shall becomea lien against the property of Granter as provided in RCW 4.56.190. 8.Grantor covenants that the owners of the property described herein are the person or persons identified on page 1 of this covenant as Grantors, that they have the right to grant this covenant on the property, and that the title to the property is free and clear of any encumbrances which would interferewith the ability to grant this covenant. Executed this day of _ Grantors: Signature(s): _ Printed Name(s): Title of Authorized Representative(s): (if signing on behalf of a corporation) Version date: 07/26/24 Page 62 Accepted and approved for the City of Anacortes: Date: Director City of Anacortes Department of Planning and Community Development Services Version date: 07/26/24 Page 63 APPENDIX 8 – Maintenance and Operations Manual and Source control Maintenance and Operations Manual is required by DOE: www.anacorteswa.gov/DocumentCenter/View/26423/Stormwater-BMP-Maintenance-Standards?bidld= Version date: 07/26/24 Page 58 IV-1 Source Control BMPs Applicable to All Sites S102 BMPs for Preventive Maintenance and Good Housekeeping Preventive maintenance and good housekeeping practices reduce the potential for stormwater to  come into contact with pollutants and can reduce maintenance intervals for the drainage system  and sewer system. Applicable BMPs: l Prevent the discharge of unpermitted liquid or solid wastes, process wastewater, and sewage to groundwater or surface water, or to storm drains that discharge to surface water, or to the ground. Conduct all oily parts cleaning, steam cleaning, or pressure washing of equipment or containers inside a building, or on an impervious contained area, such as a concrete pad. Direct contaminated stormwater from such an area to a sanitary sewer where allowed by local sewer authority, or to other approved treatment. 2024 Stormwater Management Manual for Western Washington Volume IV -Chapter 1 -Page 541  l Promptly contain and clean up solid and liquid pollutant leaks and spills including oils,  solvents, fuels, and dust from manufacturing operations on any exposed soil, vegetation, or  paved area.  l If a contaminated surface must be pressure washed, collect the resulting washwater for  proper disposal (usually involves plugging storm drains or otherwise preventing discharge,  and pumping or vactoring up washwater for discharge to sanitary sewer or for vactor truck  transport to a wastewater treatment plant for disposal).  l Do not hose down pollutants from any area to the ground, storm drains, conveyance  ditches, or receiving water. Convey pollutants before discharge to a treatment system  approved by the local jurisdiction.  l Sweep all appropriate surfaces with vacuum sweepers quarterly, or more frequently as  needed, for the collection and disposal of dust and debris that could contaminate storm- water. Use mechanical sweepers, and manual sweeping as necessary to access areas that  a vacuum sweeper can't reach to ensure that all surface contaminants are routinely  removed.  l Do not pave over contaminated soil unless it has been determined that groundwater has  not been and will not be contaminated by the soil. Call Ecology for assistance.  l Construct impervious areas that are compatible with the materials handled. Portland  cement concrete, asphalt, or equivalent material may be considered.  l Use drip pans to collect leaks and spills from industrial/commercial equipment such as  cranes at ship/boat building and repair facilities, log stackers, industrial parts, and trucks  and other vehicles stored outside.  l At industrial and commercial facilities, drain oil and fuel filters before disposal. Discard  empty oil and fuel filters, oily rags, and other oily solid waste into appropriately closed and  properly labeled containers, and in compliance with the Uniform Fire Code or International  Building Code.  l For the storage of liquids, use containers such as steel and plastic drums, that are rigid and  durable, corrosion resistant to the weather and fluid content, non-absorbent, water tight,  rodent-proof, and equipped with a close fitting cover.  l For the temporary storage of solid wastes contaminated with liquids or other potential pol- luted materials use dumpsters, garbage cans, drums, and comparable containers, which  are durable, corrosion resistant, non-absorbent, non-leaking, and equipped with either a  solid cover or screen cover to prevent littering. If covered with a screen, the container must  be stored under a roof or other form of adequate cover.  l Where exposed to stormwater, use containers, piping, tubing, pumps, fittings, and valves  that are appropriate for their intended use and for the contained liquid.  l Clean oils, debris, sludge, etc. from all stormwater BMPs regularly, including catch basins,  settling/detention basins, oil/water separators, boomed areas, and conveyance systems, to  prevent the contamination of stormwater. Refer to Ecology Requirements for Generators of  Dangerous Wastes in I-2.17 Other Regulations and Programs for references to assist in  2024 Stormwater Management Manual for Western Washington Volume IV -Chapter 1 -Page 542 handling potentially dangerous waste.  l Promptly repair or replace all substantially cracked or otherwise damaged paved secondary  containment, high-intensity parking, and any other contributing drainage areas, subjected  to pollutant material leaks or spills. Promptly repair or replace all leaking connections,  pipes, hoses, valves, etc., that can contaminate stormwater.  l Do not connect floor drains in potential pollutant source areas to storm drains, receiving  waters, or to the ground. Recommended BMPs:  l Where feasible, store potential stormwater pollutant materials inside a building or under a  cover and/or containment.  l Minimize use of toxic cleaning solvents, such as chlorinated solvents, and other toxic chem- icals.  l Use environmentally safe raw materials, products, additives, etc., such as substitutes for  zinc used in rubber production.  l Recycle waste materials such as solvents, coolants, oils, degreasers, and batteries to the  maximum extent feasible. Contact Ecology's Hazardous Waste & Toxics Reduction Pro- gram at the following web address, or your local jurisdiction, for recommendations on recyc- ling or disposal of vehicle waste liquids and other waste materials:  https://ecology.wa.gov/About-us/Get-to-know-us/Our-Programs/Hazardous-Waste-Tox- ics-Reduction   l Empty drip pans immediately after a spill or leak is collected in an uncovered area.  l Stencil warning signs at catch basins and drains, e.g., “Dump no waste – Drains to stream”.  See S442 BMPs for Labeling Storm Drain Inlets On Your Property.  l Use solid absorbents, e.g., clay and peat absorbents and rags for cleanup of liquid spill- s/leaks, where practicable.  l Promptly repair/replace/reseal damaged paved areas at industrial facilities.  l Recycle materials, such as oils, solvents, and wood waste, to the maximum extent prac- ticable. Note: Evidence of stormwater contamination can include the presence of visible sheen, color, or  turbidity in the runoff, or present or historical operational problems at the facility. Operators can  use simple pH tests, for example with litmus or pH paper. These tests can screen for high or low  pH levels (anything outside the 6.5 to 8.5 range) due to contamination of stormwater. S104 BMPs for Spill Prevention and Cleanup Description of Pollutant Sources: Spills and leaks can damage public infrastructure, interfere  with sewage treatment, and cause a threat to human health or the environment. Spills are often  preventable if appropriate chemical and waste handling techniques are practiced effectively and  2024 Stormwater Management Manual for Western Washington Volume IV -Chapter 1 -Page 543 the spill response plan is immediately implemented. Additional spill control requirements may be  required based on the specific activity occurring on site.  Applicable BMPs: Spill Prevention  l Clearly label or mark all containers that contain potential pollutants.  l Store and transport liquid materials in appropriate containers with tight-fitting lids.  l Place drip pans underneath all containers, fittings, valves, and where materials are likely to  spill or leak.  l Use tarpaulins, ground cloths, or drip pans in areas where materials are mixed, carried, and  applied to capture any spilled materials.   l Train employees on the safe techniques for handling materials used on the site and to  check for leaks and spills. Spill Plan  l Develop and implement a spill plan and update it annually or whenever there is a change in  activities or staff responsible for spill cleanup. Post a written summary of the plan at areas  with a high potential for spills, such as loading docks, product storage areas, waste storage  areas, and near a phone. The spill plan may need to be posted at multiple locations.  Describe the facility, including the owner's name, address, and telephone number; the  nature of the facility activity; and the general types of chemicals used at the facility.  l Designate spill response employees to be on-site during business activities. Provide a cur- rent list of the names and telephone numbers (home and office) of designated spill  response employees who are responsible for implementing the spill plan.   l Provide a site plan showing the locations of storage areas for chemicals, inlets/catch  basins, spill kits and other relevant infrastructure or materials information.   l Describe the emergency cleanup and disposal procedures. Note the location of all spill kits  in the spill plan.  l List the names and telephone numbers of public agencies to contact in the event of a spill. Spill Cleanup Kits  l Store all  cleanup kits near areas with a high potential for spills so that they are easily access- ible in the event of a spill. The contents of the spill kit must be appropriate to the types and  quantities of materials stored or otherwise used at the facility, and refilled when the mater- ials are used. Spill kits must be located within 25 feet of all fueling/fuel transfer areas, includ- ing on-board mobile fuel trucks. Note: Ecology recommends that the kit(s) include salvage drums or containers, such as  high density polyethylene, polypropylene or polyethylene sheet-lined steel; polyethylene or  2024 Stormwater Management Manual for Western Washington Volume IV -Chapter 1 -Page 544 equivalent disposal bags; an emergency response guidebook; safety gloves/clothes/equip- ment; shovels or other soil removal equipment; and oil containment booms and absorbent  pads; all stored in an impervious container. Spill Cleanup and Proper Disposal of Waste l Stop, contain, and clean up all spills immediately upon discovery. l Implement the spill plan immediately. l Contact the designated spill response employees. l Block off and seal nearby inlets/catch basins to prevent materials from entering the drain- age system or combined sewer. l Use the appropriate material to clean up the spill. l Do not use emulsifiers or dispersants such as liquid detergents or degreasers unless dis- posed of proplerly. Emulsifiers and dispersants are not allowed to be used on surface water, or in a place where they may enter storm drains, surface waters, treatments sys- tems, or sanitary sewers. l Immediately notify Ecology and the local jurisdiction if a spill has reached or may reach a sanitary or storm sewer, groundwater, or surface water. Notification must comply with state and federal spill reporting requirements. l Do not wash absorbent material into interior floor drains or inlets/catch basins. l Place used spill control materials in appropriate containers and dispose of according to reg- ulations. 2024 Stormwater Management Manual for Western Washington Volume IV -Chapter 1 -Page 545 S108 BMPs for Correcting Illicit Discharges to Storm Drains Description of Pollutant Sources: Illicit discharges are unpermitted sanitary or process  wastewater discharges to a storm sewer or to surface water, rather than to a sanitary sewer,  indus-trial process wastewater, or other appropriate treatment. They can also include swimming  pool water, filter backwash, cleaning solutions/washwaters, cooling water, etc. Experience has  shown that illicit discharges are common, particularly in older buildings. Pollutant Control Approach: Identify and eliminate unpermitted discharges or obtain an NPDES  permit, where  necessary, particularly at industrial and commercial facilities. Applicable Operational BMPs: l For all real properties, responsible parties must examine their plumbing systems to identify any potential illicit discharges. Review site plans, engineering drawings, or other sources of information for the plumbing systems on the property. l If an illicit discharge is suspected, trace the source using an appropriate method such as visual reconnaissance, smoke test, flow test, dye test with a nontoxic dye, or closed circuit television (CCTV) inspection. These tests are to be performed by qualified personnel such as a plumbing contractor. Note: Contact Ecology prior to performing a dye test which may result in a discharge to a receiving water. l If illicit connections are found, permanently plug or disconnect the connections. l Eliminate prohibited discharges to storm sewer(s), groundwater, or surface water(s). l Convey unpermitted discharges to a sanitary sewer if allowed by the local sewer authority, or to other approved treatment. 2024 Stormwater Management Manual for Western Washington Volume IV -Chapter 1 -Page 547  l Obtain all necessary permits for altering or repairing side sewers and plumbing fixtures.  Restrictions on certain types of discharges, particularly industrial process waters, may  require pretreatment of discharges before they enter the sanitary sewer. It is the respons- ibility of the property owner or business operator to obtain the necessary permits and to  replace the connection.  l Obtain appropriate state and local permits for these discharges. Recommended Operational BMPs: At commercial and industrial facilities, conduct a survey of wastewater discharge connections to  storm drains and to surface water as follows:  l Conduct a field survey of buildings, particularly older buildings, and other industrial areas to  locate storm drains from buildings and paved surfaces. Note where these discharge.  l During non-stormwater conditions, inspect each storm drain for non-stormwater dis- charges. Record the locations of all non-stormwater discharges. Include all permitted dis- charges.  l If useful, prepare a map of each area. Show on the map the known location of storm sew- ers, sanitary sewers, and permitted and unpermitted discharges. Aerial photos may be use- ful. Check records such as piping schematics to identify known side sewer connections and  show these on the map. Consider using smoke, dye, or chemical analysis tests to detect  connections between two conveyance systems (e.g. process water and stormwater). If  desirable, conduct Closed Circuit Television (CCTV) inspections of the storm drains and  record the footage.  l Compare the observed locations of connections with the information on the map and revise  the map accordingly. Note suspect connections that are inconsistent with the field survey.  l Identify all connections to storm sewers or to surface water and take the actions specified  above as applicable BMPs. 2024 Stormwater Management Manual for Western Washington Volume IV -Chapter 1 -Page 548 V-A.27 Maintenance Standards - Downspout, Sheet Flow, and Concentrated Dispersion Systems Maintenance Com- ponent Recommended Frequency a Condition when Maintenance is Needed (Standards)Action Needed (Procedures) Inspection Routine Maintenance Splash Block (Downspout Dispersion) Splash block B Water is being directed towards building structure Reconfigure/ repair blocks to direct water away from building structure B Water disrupts soil media Reconfigure/ repair blocks Transition Zone (Sheet Flow Dispersion) Transition zone A Adjacent soil erosion; uneven surface creating concentrated flow  discharge; or less than 2 foot of width Repair/replace transition zone to meet design criteria and eliminate con- centrated flows Dispersion Trench (Downspout Dispersion) Dispersion trench A Visual evidence of water discharging at concentrated points  along trench (normal condition is a “sheet flow” from edge of  trench; intent is to prevent erosion damage) l Remove debris from trench surface, if necessary l Realign notched grade board or other distributor type, if possible l Rebuild trench to standards, if necessary Surface of trench Fall and Spring Accumulated trash, debris, or sediment on drain rock surface  impedes sheet flow from facility Remove/dispose in accordance with local solid waste requirements Table V-A.26: Maintenance Standards - Downspout, Sheet Flow, and Concentrated Dispersion Systems 2024 Stormwater Management Manual for Western Washington Volume V -Appendix A -Page 1202 Maintenance Com- ponent Recommended Frequency a Condition when Maintenance is Needed (Standards)Action Needed (Procedures) Inspection Routine Maintenance A, W Vegetation/moss present on drain rock surface impedes sheet  flow from facility Maintain open, freely draining drain rock surface Pipe(s) to trench A, W Accumulation of trash, debris, or sediment in roof drains, gutters,  driveway drains, area drains, etc.Remove/ dispose A, W Pipe from sump to trench or drywell has accumulated sediment  or is plugged Clear sediment from inlet/outlet pipe screen and inlet/outlet pipe A, W Cracked, collapsed, broken, or misaligned drain pipes l Repair/seal cracks l Replace when repair is insufficient Sump A Sediment in the sump l Remove/ dispose in accordance with local solid waste requirements l Clear sediment from inlet/outlet pipe screen and/or inlet/outlet pipe Access lid A Cannot be easily opened Repair/ replace A Buried Refer to record drawings for design intent. If the access lid was designed to  be exposed, expose and restore to surface grade A Cover missing Replace Rock Pad (Concentrated Flow Dispersion) Rock pad A Only one layer of rock exists above native soil in area 6 square  feet or larger, or any exposure of native soil l Replace/ repair rock pad to meet design standards l Enlarge pad size or add additional courses of rock, if necessary A Soil erosion in or adjacent to rock pad Repair/replace rock pad to meet design standards Dispersal Area Dispersal area (gen- eral) B, S Erosion (gullies/ rills) greater than 2 inches deep in dispersal  area Eliminate cause of erosion and stabilize damaged area (regrade, rock, reve- getate) B, S Accumulated sediment or debris to extent that blocks or chan- nelizes flow path  l Remove excess sediment or debris l Identify and control the sediment source (if feasible) Ponded water B, S Standing surface water in dispersion area remains for more than  3 days after the end of a storm event Identify the cause of the standing water (e.g. grade depressions, compacted  soil) and take appropriate actions to address the problem (e.g. regrade to elim- inate depressions or aerate/ amend soils) Plant establishment B Once every 1-2 weeks or  as needed during pro- longed dry periods b Dispersal area vegetation in establishment period (1-2 years, or  additional 3rd year during extreme dry weather)Water weekly during periods of no rain to ensure plant establishment Vegetation As needed Poor vegetation cover such that erosion is occurring l Ensure proper care (e.g. watering) l Assess for nutrient deficiencies Table V-A.26: Maintenance Standards - Downspout, Sheet Flow, and Concentrated Dispersion Systems (continued) 2024 Stormwater Management Manual for Western Washington Volume V -Appendix A -Page 1203 Maintenance Com- ponent Recommended Frequency a Condition when Maintenance is Needed (Standards)Action Needed (Procedures) Inspection Routine Maintenance l Replant as needed with appropriate plant species for the soil and mois- ture conditions l Consider amending soils to promote plant health B, S Vegetation inhibits dispersed flow along flow path Trim, weed or replant to restore dispersed flow path Storage Sump Sump A Accumulated sediment in the sump l Remove/ dispose in accordance with local solid waste requirements l Clear sediment from inlet/outlet pipe screen and/or inlet/outlet pipe Access lid A Cannot be easily opened Repair/ replace A Buried Expose and restore to surface grade A Cover missing Replace Pest Control General Pests As needed Signs of pest infestations (IPM protocol threshold(s) are  exceeded)Follow IPM protocols for weed and pest management Mosquitoes B, S Standing surface water in dispersion area remains for more than  3 days after the end of a storm l Identify the cause of the standing water and take appropriate actions to address the problem (see “Ponded water”) l Do not use pesticides or Bacillus thuringiensis israelensis (Bti) Rodents As needed Rodent holes or mounds disturb dispersion flow paths Fill and compact soil around the holes and vegetate to restore flow path Note that the inspection and routine maintenance frequencies listed above are recommended by Ecology. They do not supersede or replace the municipal stormwater permit requirements for inspection frequency required of municipal stormwater  permittees for "stormwater treatment and flow control BMPs/facilities". a) Frequency: A = Annually; B = Biannually (twice per year); W = At least once during the wet season (for debris/clog  related maintenance, this visit should occur in the  early fall, after deciduous trees have lost their leaves); S = Perform  inspections after major storm events (24-hour storm event with a 10-year or  greater recurrence interval). b) Inspection should occur during plant establishment period (1-2 years, or additional 3rd year during extreme dry weather). IPM - Integrated Pest Management Source: (Herrera and WSC, 2013) Table V-A.26: Maintenance Standards - Downspout, Sheet Flow, and Concentrated Dispersion Systems (continued) 2024 Stormwater Management Manual for Western Washington Volume V -Appendix A -Page 1204 V-A.29 Maintenance Standards - Post-Construction Soil Quality and Depth Maintenance Component Recommended Frequency a Condition when Maintenance is Needed (Standards)Action Needed (Procedures) Inspection Routine Maintenance Soil media (maintain high  organic soil content) A Vegetation not fully covering  ground surface or vegetation health  is poor l Maintain 2 to 3 inches of mulch over bare areas in landscape beds l Add plants if sufficient space l Re-seed bare turf areas until the vegetation fully covers ground surface Ongoing None (routine maintenance)Return leaf fall and shredded woody materials from the landscape to the site when possible  in order to replenish soil nutrients and structure Ongoing None (routine maintenance)On turf areas, “grasscycle” (mulch-mow or leave the clippings) to build turf health Ongoing None (routine maintenance)Avoiding use of pesticides (bug and weed killers), like “weed & feed”, which damage the soil A None (routine maintenance) l Where fertilization is needed (mainly turf and annual flower beds), a moderate fer- tilization program should be used which relies on compost, natural fertilizers or slow- release synthetic balanced fertilizers l Follow IPM protocols for fertilization procedures Soil media (maintain infilt- ration)Ab Soils become waterlogged, do not  appear to be infiltrating l To remediate compaction, aerate soil, till to at least 8-inch depth, or further amend soil with compost and re-till l If areas are turf, aerate compacted areas and topdress them with 1/4 to 1/2 inch of compost to renovate them l If drainage is still slow, consider investigating alternative causes (e.g. high wet sea- son groundwater levels, low permeability soils) l Also consider site use and protection from compacting activities Erosion / Scouring A, W, S Areas of potential erosion are vis- ible l Identify and address cause of erosion (e.g. concentrate flow entering area, chan- nelization of runoff) and stabilize damaged area (regrade, rock, vegetation, erosion control matting) l For deep channels or cuts (over 3 inches in ponding depth), temporary erosion con- trol measures should be put in place until permanent repairs can be made. Grass / Vegetation A Less than 75% of planted veget- ation is healthy with a generally l Take appropriate maintenance actions (e.g. remove/ replace plants) Table V-A.28: Maintenance Standards - Post-Construction Soil Quality and Depth 2024 Stormwater Management Manual for Western Washington Volume V -Appendix A -Page 1206 Maintenance Component Recommended Frequency a Condition when Maintenance is Needed (Standards)Action Needed (Procedures) Inspection Routine Maintenance good appearance  l If problem persists, evaluate if vegetation is appropriate for the location (e.g. expos- ure, soil, soil moisture) Noxious weeds   M  (March – October, pre- ceding seed dispersal) Listed noxious vegetation is present  (refer to current county noxious  weed list)  l By law, class A & B noxious weeds must be removed, bagged and disposed as  garbage immediately  l Reasonable attempts must be made to remove and dispose of class C noxious  weeds  l Watch for and respond to new occurrences of especially aggressive weeds such as  Himalayan blackberry, Japanese knotweed, morning glory, English ivy, and reed  canary grass to avoid invasions  l It is strongly encouraged that herbicides and pesticides not be used in order to protect  water quality; use of herbicides and pesticides may be prohibited in some jur- isdictions Weeds   M  (March – October, pre- ceding seed dispersal) Weeds are present  l Remove weeds with their roots manually with pincer-type weeding tools, flame weed- ers, or hot water weeders as appropriate  l Follow IPM protocols for weed management Note that the inspection and routine maintenance frequencies listed above are recommended by Ecology. They do not supersede or replace the municipal stormwater permit requirements for inspection frequency required of municipal stormwater  permittees for "stormwater treatment and flow control BMPs/facilities". a) Frequency: A = Annually; B = Biannually (twice per year); M = Monthly; W = At least one visit should occur during the wet season (for debris/clog  related maintenance, this visit should occur in the  early fall, after deciduous trees have lost their  leaves); S = Perform  inspections after major storm events (24-hour storm event with a 10-year or  greater recurrence interval). b) Inspection should occur during a storm event. IPM - Integrated Pest Management Source: (Herrera and WSC, 2013) Table V-A.28: Maintenance Standards - Post-Construction Soil Quality and Depth (continued) 2024 Stormwater Management Manual for Western Washington Volume V -Appendix A -Page 1207 V-A.7 Maintenance Standards - Catch Basins Maintenance Component Defect Conditions When Maintenance is Needed Results Expected When Maintenance is per- formed General Trash & Debris  Trash or debris  which is located immediately in front of the catch basin opening or is  blocking inletting capacity of the basin by more than 10%. Trash or debris  (in the basin) that exceeds 60% of the sump depth as measured from the  bottom of basin to invert of the lowest pipe into or out of  the basin, but in  no case less than a minimum of 6 inches clearance from the debris surface  to the invert of the lowest pipe. Trash or debris in  any inlet or outlet pipe blocking more than 1/3 of its height. Dead animals or  vegetation that could generate odors that could cause complaints or dangerous  gases (e.g. methane). No Trash or debris  located immediately in front of  catch basin or on grate opening. No trash or debris  in the catch basin. Inlet and outlet  pipes free of trash or debris. No dead animals or  vegetation present within the  catch basin. Sediment Sediment (in the  basin) that exceeds 60% of the sump depth as measured from the bottom  of basin to invert of the lowest pipe into or out of the  basin, but in no  case less than a minimum of 6 inches clearance from the sediment surface to  the invert of the lowest pipe.No sediment in the  catch basin Structure Damage  to  Frame and/or Top Slab Top slab has holes  larger than 2 square inches or cracks wider than 1/4 inch. (Intent is to make  sure no material is running into basin). Frame not sitting  flush on top slab, i.e. separation of more than 3/4 inch of the frame from  the top slab. Frame not securely attached. Top slab is free  of holes and cracks. Frame is sitting  flush on the riser rings or top slab  and firmly attached. Fractures or  Cracks in  Basin Walls/ Bottom Maintenance person judges that structure is  unsound. Grout fillet has  separated or cracked wider than 1/2 inch and longer than 1 foot at the joint  of any inlet/outlet pipe or any evidence of soil particles  entering catch  basin through cracks. Basin replaced or  repaired to design standards. Pipe is regrouted  and secure at basin wall. Settlement/  Mis- alignment If failure of  basin has created a safety, function, or design problem. Basin replaced or  repaired to design standards. Vegetation Vegetation growing  across and blocking more than 10% of the basin opening. Vegetation growing  in inlet/outlet pipe joints that is more than 6 inches tall and less than  6 inches apart. No vegetation  blocking opening to basin. No vegetation or  root growth present. Contamination and  Pol-See V-A.2 Maintenance Standards - Detention Ponds No pollution  present. Table V-A.6: Maintenance Standards - Catch Basins 2024 Stormwater Management Manual for Western Washington Volume V -Appendix A -Page 1178 Maintenance Component Defect Conditions When Maintenance is Needed Results Expected When Maintenance is per- formed lution Catch Basin Cover Cover Not in Place Cover is missing  or only partially in place. Any open catch basin requires maintenance.Cover/grate is in place, meets design standards,  and is secured. Locking Mechanism  Not Working Mechanism cannot be  opened by one maintenance person with proper tools. Bolts into frame have  less than 1/2 inch of thread.Mechanism opens  with proper tools. Cover Difficult to  Remove One maintenance  person cannot remove lid after applying normal lifting pressure. (Intent is keep  cover from sealing off access to maintenance.) Cover can be  removed by one maintenance per- son. Ladder Ladder Rungs  Unsafe Ladder is unsafe  due to missing rungs, not securely attached to basin wall, misalignment,  rust, cracks, or sharp edges.Ladder meets  design standards and allows main- tenance person safe access. Metal Grates (if applicable) Grate opening  Unsafe Grate with opening  wider than 7/8 inch.Grate opening  meets design standards. Trash and Debris Trash and debris  that is blocking more than 20% of grate surface inletting capacity.Grate free of  trash and debris. Damaged or  Missing.Grate missing or  broken member(s) of the grate.Grate is in place, meets the design standards, and  is installed and aligned with the flow path. Table V-A.6: Maintenance Standards - Catch Basins (continued) 2024 Stormwater Management Manual for Western Washington Volume V -Appendix A -Page 1179