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APPROVED STM BLD2020-0894+Storm_Drainage_Report+5.21.2021_11.13.25_AM+2210260RESUB BLD2020-0894 May 21 2021 CITY OF EDMONDS DEVELOPMENT SERVICES DEPARTMENT COMPLIES WITH APPLICABLE CITY STORMWATER CODE 6/10/2021 TARGETED STORMWATER DRAINAGE REPORT for Harris Duplex 21022 7411 Avenue W Edmonds, WA 98026 # PFN ISSUE DATE: April 2nd, 2020 REVISION DATE: May S, 2021 PREPARED BY.- NATHAN A. THOMPSON, E.T. REVIEWED BY.• TIMOTHY A. SARKELA, P.E. OWNER David Harris Enterprises 19702 20th Avenue NW Shoreline, WA 98177 Office: (206) 795-2009 Cell: (206) 546-5392 05- 79--21 F.NC-1NF.FR Western Engineers & Surveyors, Inc. Job # 20-1868-A WESTERN ENGINEERS, INC. 02019 HARRIS DUPLEX TABLE OF CONTENTS Page MINIMUM REQ. #1 ExecutiveSummary.......................................................................... 2 ExistingConditions........................................................................... 2 VicinityMap...................................................................................... 3 Upstream/Downstream Analysis...................................................... 4 Drainage Complaints........................................................................ 4 Basin& Aerial Maps......................................................................... 5 Downstream Photographs................................................................ 7 MINIMUM REQ. #2 SWPPP Narrative..................................................16 MINIMUM REQ. #3 Water Pollution Source Control ...........................17 MINIMUM REQ. #4 Natural Drainage System & Outfalls...................17 MINIMUM REQ. #5 On -Site Storm Water Management .....................17 WWHM Infiltration Trench Calculations ..................................... 20 MINIMUM REQ. #6 Runoff Treatment .................................................. 25 MINIMUM REQ. #7 Flow Control........................................................... 25 MINIMUM REQ. #8 Wetland Protection ................................................ 26 MINIMUM REQ. #9 Operations & Maintenance ................................... 27 APPENDIX I — Drainage Plan................................................................... 30 APPENDIX II — Soil Information............................................................. 32 APPENDIX III — Soil Amendment............................................................ 37 WESTERN ENGINEERS, INC. I PROJECT: 20-1868-A HARRIS DUPLEX Minimum Requirement # 1: Stormwater Site Plan Executive Summary The proposed project consists entirely of clearing/grading for the construction of a new Duplex, and an associated driveway and drainage improvements. Drainage management for new roof areas (2,135 sf) is to consist primarily of BMP T5. l0A a 12'x2l' Drainage management for new driveway and walkway areas (935 sf) will consist of a 47-sf rain garden (at the top ponding elevation) per BMP T5.14A. The rain garden will have an overflow along the east side of the garden area. The roof infiltration trench and the driveway rain garden have been designed to provide full infiltration of the 100-year storm event per WWHM calculations. New patio areas (126 sf) have been designed to sheet flow disperse through proposed lawn areas. Total new impervious area proposed for the project total 3,443 sf. located within the boundary lines of the site. The project is to be designed to the DOE 2019 Stormwater Management Manual for Western Washington along with city of Edmonds 2017 Stormwater Manual. Existing Conditions Summary The property is a one tax parcel and currently contains a single-family residence with its respective concrete driveway. Vegetation on -site consists of residential lawn areas, and partial tree covering. Slopes on -site are moderate, ranging from 2% to 8%, and sloping southeasterly toward adjacent properties to the south. From a Snohomish County Soil Survey done by USDA the soils on -site consist of Alderwood Urban Land Complex type soils. According to a site investigation by Cobalt Geosciences, LLC on March 30th, 2020, on -site soils resemble medium gray sand with gravel type soils. Refer to Appendix II for soil information. Surrounding parcels are developed with existing SFRs and driveways. Vegetation in the surrounding area is comprised primarily of residential lawn and second/third growth forest. WESTERN ENGINEERS, INC. 2 PROJECT: 20-1868-A HARRIS DUPLEX VICINITY MAP 208th St SW 208th St SW —� A S N ] O s D n R < Lynnwc prouts Preschool 0 and AmrT & Childcare Magic Toyota Pre Owned Q Park 210 Q ite and monds V 21Qth R S:4 210th St SW OAell C�1 pa Ten20 Q Enterprise Rent-A-Car Irger King r_ Jack In the Box Q Clean dway © ;hool 212th St SW 212th St SW 212th St S Magic Toyota IQ Park 212 Q CarMax Q Edmonds Park & Ride Q 213th PI SW 19 SEAWEED Cannabis Edmonds - Dispensary.. Aldercrest Health Q 215th St sw & Rehab Center c © McDonald's Q Foreign Eng QCarter Acura Value Village Swedish Edmonds Campus 21tiih Si SW � MAP TAKEN FROM GOOGLE MAPS WESTERN HARRIS DUPLEX ENGINEERS & SURVEYORS EDMONDS 98026 SURVEYORS• ENGINEERS• LAND USE CONSULTANTS 9740 Evergreen Way, Everett WA 98204 SCALE00 DATE: 06/05/20 CHECKED: TAS (425) 356-2700+ (425) 356-2708 (FAX) JOB NUMBER: FILE NAME: westernengineers.com BY: NAT 20-1868-A 201868A/VICINITYMAP WESTERN ENGINEERS, INC. 3 PROJECT: 20-1868-A HARRIS DUPLEX Upstream Analysis From available topographic elevation information acquired, upstream runoff will originate in the form of both sheet flows as well as subsurface flows coming from the adjacent parcels to the north majority of which consist of residential lawn, driveway, and roof areas. No other runoff appears to enter the site and no erosion due to existing runoff was observed. Downstream Analysis A downstream analysis was provided by Nathan Thompson, E.T. of Western Engineers & Surveyors, Inc. on December 11, 2019. The weather consisted of mostly cloudy skies, with a temperature around 60 degrees. Refer to the aerial map in the next section of this report for a depiction of runoff paths. The entire property tends to slope southeasterly and runoff exiting the site flows onto the driveway and parking lot of the property directly south of the site and onto the west side of 74th Ave W. The runoff entering the property directly south is intercepted by the private drainage system within the property, which eventually flows into the public drainage system within 74th Ave W. The runoff that flows onto the west side of 74th Ave W continues to flow in a southerly direction along the west side of 74th Ave W until it enters the public drainage system via a catch basin. The flow then continues in a southerly direction within the subsurface drainage system for approximately 410 feet until it is rerouted in an easterly direction via a storm sewer manhole. The flow then continues in an easterly direction in the drainage system beneath 212th St SW for approximately 700 feet and is then rerouted in a southerly direction. This flow then continues in a southerly direction for approximately 1,300 feet beneath 72nd Ave W until it is rerouted in an easterly direction. The runoff continues in an easterly direction underneath 2161h St SW for approximately 1,000 feet until it daylights into Hall Creek, which is situated on the south side of the Interurban Trail. As this is the closest receiving water, no further downstream analysis is required. Drainage Complaints There are known found drainage complaints for this site. WESTERN ENGINEERS, INC. 4 PROJECT: 20-1868-A HARRIS DUPLEX BASIN AND AERIAL MAPS WESTERN ENGINEERS, INC. 5 PROJECT: 20-1868-A HARRIS DUPLEX AERIAL AND PHOTO MAP Photo Taken from GooEle Earth WESTERN HARRIS SFR ENGINEERS & EDMONDS 98026 SURVEYORS SURVEYORS • ENGINEERS • LAND USE CONSULTANTS SCALE: 9740 Evergreen Way, Everett WA 98204 I" �350' DATE: 06/10/20 CHECKED: TAS JOB NUMBER: FILE NAME: (425) 356-2700 +425) 356-2708 (FAX) By: NAT 20-1868-A Aerial Map WESTERN ENGINEERS, INC. 6 PROJECT: 20-1868-A HARRIS DUPLEX DOWNSTREAM PHOTOGRAPHS WESTERN ENGINEERS, INC. 7 PROJECT: 20-1868-A HARRIS DUPLEX DOWNSTREAM PHOTOGRAPHS PHOTO 2: Figure to the Right: Looking northerly from the westerly boundary line of the site. WESTERN ENGINEERS & SURVEYORS SURVEY ORS• ENGINEERS• LAND USE CONSULTANTS 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 356-2708 (FAX) westernengineers.com PHOTO 1: Figure to the Left: Looking easterly from the northwest corner of the site. HARRIS SFR EDMONDS 98026 SCALE: None I DATE: 06/10/20 1 SHEET: 1 OF 8 JOB NUMBER: FILE NAME: BY: NAT 20-1868-A WESTERN ENGINEERS, INC. 8 PROJECT: 20-1868-A HARRIS DUPLEX DOWNSTREAM PHOTOGRAPHS PHOTO 4: Figure to the Right: Looking westerly from the center of 741h Ave W. WESTERN ENGINEERS & SURVEYORS SURVEY ORS• ENGINEERS• LAND USE CONSULTANTS 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 356-2708 (FAX) westernengineers.com PHOTO 3: Figure to the Left: Looking southerly from the same location as the previous photo. HARRIS SFR EDMONDS 98026 SCALE: None I DATE: 06/10/20 1 SHEET: 2 OF 8 JOB NUMBER: FILE NAME: BY: NAT 20-1868-A WESTERN ENGINEERS, INC. 9 PROJECT: 20-1868-A HARRIS DUPLEX DOWNSTREAM PHOTOGRAPHS PHOTO 5: Figure to the Left: Looking westerly from the west side of 74th Ave W. R PHOTO 6: Figure to the Right: Looking southerly from the same location as photo 4. WESTERN HARRIS SFR ENGINEERS & SURVEYORS EDMONDS 98026 SURVEYORS • ENGINEERS • LAND USE CONSULTANTS 9740 Evergreen Way, Everett WA 98204 SCALE: None DATE: 06/10/20 SHEET: 3 OF 8 (425) 356-2700 (425) 356-2708 (FAX) JOB NUMBER: FILE NAME: westernengineers.com BY: NAT 20-1868-A WESTERN ENGINEERS, INC. 10 PROJECT: 20-1868-A HARRIS DUPLEX DOWNSTREAM PHOTOGRAPHS PHOTO 8: Figure to the Right: Looking easterly from the west side of 74th Ave W. WESTERN ENGINEERS & SURVEYORS SURVEY ORS• ENGINEERS• LAND USE CONSULTANTS 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 356-2708 (FAX) westernengineers.com PHOTO 7: Figure to the Left: Looking northerly from the east side of 74th Ave W. HARRIS SFR EDMONDS 98026 SCALE: None DATE: 06/10/20 SHEET: 4 OF 8 JOB NUMBER: FILE NAME: BY: NAT 20-1868-A WESTERN ENGINEERS, INC. 11 PROJECT: 20-1868-A HARRIS DUPLEX DOWNSTREAM PHOTOGRAPHS ;#. -,Nw PHOTO 9: Figure to the Left: Looking southerly from approximately the same location as the previous photo. PHOTO 10: Figure to the Right: Looking easterly from the north side of 212th St SW. WESTERN HARRIS SFR ENGINEERS & SURVEYORS EDMONDS 98026 SURVEYORS • ENGINEERS • LAND USE CONSULTANTS 9740 Evergreen Way, Everett WA 98204 SCALE: None DATE: 06/10/20 SHEET: 5 OF 8 (425) 356-2700 (425) 356-2708 (FAX) JOB NUMBER: FILE NAME: westernengineers.com BY: NAT 20-1868-A WESTERN ENGINEERS, INC. 12 PROJECT: 20-1868-A HARRIS DUPLEX DOWNSTREAM PHOTOGRAPHS PHOTO 12: Figure to the Right: Looking north from the west side of 72nd Ave W. WESTERN ENGINEERS & SURVEYORS SURVEY ORS• ENGINEERS• LAND USE CONSULTANTS 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 356-2708 (FAX) westernengineers.com PHOTO 11: Figure to the Left: Looking easterly from the north side of 212th St SW. HARRIS SFR EDMONDS 98026 SCALE: None I DATE: 06/10/20 1 SHEET: 6 OF 8 JOB NUMBER: FILE NAME: BY: NAT 20-1868-A WESTERN ENGINEERS, INC. 13 PROJECT: 20-1868-A HARRIS DUPLEX DOWNSTREAM PHOTOGRAPHS PHOTO 14: Figure to the Right: Looking southerly from the background of the previous photo. WESTERN ENGINEERS & SURVEYORS SURVEY ORS• ENGINEERS• LAND USE CONSULTANTS 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 356-2708 (FAX) westernengineers.com PHOTO 13: Figure to the Left: Looking southerly from the same location at the previous photo. HARRIS SFR EDMONDS 98026 SCALE: None I DATE: 06/10/20 1 SHEET: 7 OF 8 JOB NUMBER: FILE NAME: BY: NAT 20-1868-A WESTERN ENGINEERS, INC. 14 PROJECT: 20-1868-A HARRIS DUPLEX DOWNSTREAM PHOTOGRAPHS 'vo } -+• PHOTO 15: Figure to the Left: Looking easterly from the background of the previous photo. WESTERN HARRIS SFR ENGINEERS & SURVEYORS EDMONDS 98026 SURVEYORS • ENGINEERS • LAND USE CONSULTANTS 9740 Evergreen Way, Everett WA 98204 SCALE: None DATE: 06/10/20 SHEET: 8 OF 8 (425) 356-2700 (425) 356-2708 (FAX) JOB NUMBER: FILE NAME: westernengineers.com BY: NAT 20-1868-A WESTERN ENGINEERS, INC. 15 PROJECT: 20-1868-A HARRIS DUPLEX Minimum Requirement # 2: SWPPP Narrative Element #1: Mark Clearing Limits Clearing limits have been shown on the Temporary Erosion and Sedimentation Control Plans. Element #2: Establish Construction Entrance A temporary construction entrance shall be established in the southeast location of the site. All vehicles shall be free of debris prior to leaving the site. Element # 3: Control Flow Rates Flow rates during construction are to be contained through the installation of silt fencing along the southern and western clearing limits. Element # 4: Install Sediment Controls Sediment controls mainly consist of installing silt fencing along the southern and western clearing limits. Element # 5: Stabilize Soils All soils disturbed during site grading will be stabilized by use of the most appropriate BMP method available. These consist of short-term and long-term solutions. Short-term methods consist of compaction of the soils by vibratory roller or bulldozer. Long-term methods consist of straw covering over the soils (this is in the case of the project becoming dormant for greater than I month). At this time no wintertime grading or construction activities will occur. During construction periods longer than I working week (7 days) where the soils are exposed and un-worked will use the proscribed methods in the Storm Water Management Manual for Western Washington to reduce sedimentation transported offsite. If winter grading is conducted, all exposed soils shall be covered within 2 days. Element # 6: Protect Slopes There are no steep slopes on or near the site. Element 6 does not apply. Element # 7: Protect Drain Inlets Downstream inlets will be protected with catch basin inserts or equivalent. Element # 8: Stabilize Channels and Outlets The need for channel stabilization is not expected but, existing channels or drainage outlets located within 500-feet of the property of the property should be routinely inspected for debris that may dam and/or aid erosion. Element # 9: Control Pollutants All pollutants from construction vehicles will be contained and disposed of in the approved manner consistent with state environmental policies. Any vehicle maintenance will be performed by authorized mechanics using drip pans and waste containment vessels. All pollutants will be disposed offsite at approved facilities. WESTERN ENGINEERS, INC. 16 PROJECT: 20-1868-A HARRIS DUPLEX Element # 10: Control De -Watering De -watering of the site is not expected. If dewatering of the site is needed, all groundwater removed shall be retained and recharged into the ground after de -watering has been finalized. Element # 11: Maintain BMPs All Temporary Erosion and Sedimentation Control (TESC) devices and equipment will be inspected and maintained on a weekly basis if not sooner, based on Storm events contributing to runoff. When construction is complete and the site is stabilized, any existing sediment will be removed and stabilized onsite. Element # 12: Manage the Project A general construction manager will manage the project for or by the owners. The construction manager shall maintain all of the above items in order to minimize sediment transport and turbid water leaving the site. His job will entail continual observation of the grading operations to ensure minimal effects to adjacent properties and offsite waterways. Element # 13: Protect On -Site Stormwater Management BMPs Stormwater management mainly consists of infiltration and soil amendment BMPs. Soil amendment areas will be protected from siltation and compaction when feasible. Minimal Requirement # 3: Water Pollution Source Control All proposed development is to consist of residential construction. No water pollution source control is needed. Minimum Requirement # 4: Preservation of Natural Drainage Systems and Outfalls, and provisions of off -site mitigation No changes to the existing drainage systems and outfalls are proposed with this development. All proposed runoff from the project area is to be infiltrated. Minimum Requirement #5 On -Site Storm Water Management Due to the project proposing less than 5,000 sf of new hard surfaces, the project is considered Medium Impact and 2019 DOE Manual Minimum Requirements 1 through 5 must be evaluated. Per 2019 Stormwater Management Manual for Western Washington Volume 1 Section 2.5.5 the project will fulfill the requirements of List #1 of that section and the following BMPs must be implemented when feasible: Lawn and landscaped areas: • Post -Construction Soil Quality and Depth in accordance with BMP T5.13 in Chapter 5 of Volume V. WESTERN ENGINEERS, INC. 17 PROJECT: 20-1868-A HARRIS DUPLEX Roofs feasibility description: 1. Full Dispersion per BMP T5.30 or Downspout Full Infiltration per BMP T5.10A. i. Full Dispersion is infeasible due to a lack of native vegetation. The site consists almost entirely of residential lawn, which does not allow for the retention of 65% of the site in a forested or native condition. ii. Full Infiltration is feasible for the proposed roof areas and will be used. A 12'x2l' infiltration trench is proposed to the southwest of the proposed residence in a relatively flat area of the site and it will handle runoff from the approximate 2,135 sf. of roof area. See the following section of BMP sizing. 2. Rain Gardens per BMP T5.14 or Bioretention per BMP T7.30. i. N/A, previous BMPs selected for all roof areas. 3. Downspout Dispersion Systems in accordance with BMP T5.1 OB. i. N/A, previous BMPs selected for all roof areas. 4. Perforated Stub -out Connections in accordance with BMP T5.10C. i. N/A, previous BMPs selected for all roof areas. Other Hard Surfaces feasibility description: 1. Full Dispersion per BMP T5.30 i. As noted above, Full Dispersion is infeasible due to a lack of native vegetation. On -site vegetation is almost entirely residential lawn, which does not allow for the retention of 65% of the site in a forested or native condition. 2. Permeable Pavement per BMP T5.15, or Rain Gardens per BMP T5.14, or Bioretention per BMP T7.30. i. The project has selected Rain Gardens to manage runoff from proposed driveway and walkway areas. The rain garden is sized at 5% of the contributing hardscape area (935 sf) for a total gain garden area of 47 sf. 3. Sheet Flow Dispersion in accordance with BMP T5.12 or BMP T5.11. i. Due to their small size, patio areas have been designed to sheet flow disperse through proposed lawn vegetation. See below for sizing: Duplex Trench Sizing Refer to WWHM infiltration trench sizing in the following section. Note that all roof runoff for the 100-year storm event will be infiltrated and the system does not require an engineered overflow. WESTERN ENGINEERS, INC. 18 PROJECT: 20-1868-A HARRIS DUPLEX Driveway and Walkway Rain Garden Sizing Proposed Driveway + Walkway Area = 735 SF +200 SF = 935 SF Minimum Ponding Surface at Overflow = 5% of Total Area Draining into Rain Garden Required Ponding Surface at Overflow = 935 SF x 5% / 100 = 46.75 SF Designed Ponding Surface at Overflow = 47 SF Per WWHM calculations, a rain garden with a bottom area of 3'x3' or 6'x6' (36 SF) at the overflow would infiltrate 100% of the runoff from driveway and walkway areas. This is less than the minimum area of 5% of the area flowing to the rain garden, so a minimum area of 46.75 SF will be used. Patio Dispersion Sizing Patio Length (Parallel to flow path) = Two 10' wide patio areas = 20' Dispersion Flow Path Length = 10' vegetated flow path for every 20' hardscape, 10' Min. Designed Flow Path Length = 10' The required minimum flow path length of 10' will be provided southerly of the proposed patios (downslope of the proposed patios). Additionally, all disturbed pervious areas are to be amended per BMP T5.13. WESTERN ENGINEERS, INC. 19 PROJECT: 20-1868-A HARRIS DUPLEX WWHM Infiltration Trench Sizing Calculation WESTERN ENGINEERS, INC. 20 PROJECT: 20-1868-A HARRIS DUPLEX WWHM2012 PROJECT REPORT Project Name: Roof Infil Trench DOT Site Name: Site Address: City Report Date: 5/5/2021 MGS Regoin Puget East Data Start 1901/10/1 Data End : 2058/09/30 DOT Data Number: 03 Version Date: 2019/09/13 Version : 4.2.17 PREDEVELOPED LAND USE Name : Roof Predev Bypass: No Groundwater: No Pervious Land Use acre C, Lawn, Flat .049 Pervious Total 0.049 Impervious Land Use acre Impervious Total 0 Basin Total 0.049 MITIGATED LAND USE Name : Roof Dev Bypass: No GroundWater: No Pervious Land Use acre Pervious Total Impervious Land Use ROOF TOPS FLAT Impervious Total Basin Total Element Flows To: Surface Roof Infil Trench N acre 0.049 0.049 0.049 Interflow Roof Infil Trench Groundwater WESTERN ENGINEERS, INC. 21 PROJECT: 20-1868-A HARRIS DUPLEX Name : Roof Infil Trench Bottom Length: 21.00 ft. Bottom Width: 12.00 ft. Trench bottom slope 1: 0 To 1 Trench Left side slope 0: 0 To 1 Trench right side slope 2: 0 To 1 Material thickness of first layer: 1.5 Pour Space of material for first layer: 0.33 Material thickness of second layer: 0.5 Pour Space of material for second layer: 0.15 Material thickness of third layer: 0 Pour Space of material for third layer: 0 Infiltration On Infiltration rate: 1.6 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 18.39 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 18.39 Percent Infiltrated: 100 Total Precip Applied to Facility: 0 Total Evap From Facility: 0 Discharge Structure Riser Height: 2 ft. Riser Diameter: 6 in. Element Flows To: Outlet 1 Outlet 2 Gravel Trench Bed Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) lnfilt(cfs) 0.0000 0.005 0.000 0.000 0.000 0.0233 0.005 0.000 0.000 0.009 0.0467 0.005 0.000 0.000 0.009 0.0700 0.005 0.000 0.000 0.009 0.0933 0.005 0.000 0.000 0.009 0.1167 0.005 0.000 0.000 0.009 0.1400 0.005 0.000 0.000 0.009 0.1633 0.005 0.000 0.000 0.009 0.1867 0.005 0.000 0.000 0.009 0.2100 0.005 0.000 0.000 0.009 0.2333 0.005 0.000 0.000 0.009 0.2567 0.005 0.000 0.000 0.009 0.2800 0.005 0.000 0.000 0.009 0.3033 0.005 0.000 0.000 0.009 0.3267 0.005 0.000 0.000 0.009 0.3500 0.005 0.000 0.000 0.009 0.3733 0.005 0.000 0.000 0.009 0.3967 0.005 0.000 0.000 0.009 0.4200 0.005 0.000 0.000 0.009 0.4433 0.005 0.000 0.000 0.009 0.4667 0.005 0.000 0.000 0.009 0.4900 0.005 0.000 0.000 0.009 0.5133 0.005 0.001 0.000 0.009 0.5367 0.005 0.001 0.000 0.009 WESTERN ENGINEERS, INC. 22 PROJECT: 20-1868-A HARRIS DUPLEX 0.5600 0.005 0.001 0.000 0.009 0.5833 0.005 0.001 0.000 0.009 0.6067 0.005 0.001 0.000 0.009 0.6300 0.005 0.001 0.000 0.009 0.6533 0.005 0.001 0.000 0.009 0.6767 0.005 0.001 0.000 0.009 0.7000 0.005 0.001 0.000 0.009 0.7233 0.005 0.001 0.000 0.009 0.7467 0.005 0.001 0.000 0.009 0.7700 0.005 0.001 0.000 0.009 0.7933 0.005 0.001 0.000 0.009 0.8167 0.005 0.001 0.000 0.009 0.8400 0.005 0.001 0.000 0.009 0.8633 0.005 0.001 0.000 0.009 0.8867 0.005 0.001 0.000 0.009 0.9100 0.005 0.001 0.000 0.009 0.9333 0.005 0.001 0.000 0.009 0.9567 0.005 0.001 0.000 0.009 0.9800 0.005 0.001 0.000 0.009 1.0033 0.005 0.001 0.000 0.009 1.0267 0.005 0.002 0.000 0.009 1.0500 0.005 0.002 0.000 0.009 1.0733 0.005 0.002 0.000 0.009 1.0967 0.005 0.002 0.000 0.009 1.1200 0.005 0.002 0.000 0.009 1.1433 0.005 0.002 0.000 0.009 1.1667 0.005 0.002 0.000 0.009 1.1900 0.005 0.002 0.000 0.009 1.2133 0.005 0.002 0.000 0.009 1.2367 0.005 0.002 0.000 0.009 1.2600 0.005 0.002 0.000 0.009 1.2833 0.005 0.002 0.000 0.009 1.3067 0.005 0.002 0.000 0.009 1.3300 0.005 0.002 0.000 0.009 1.3533 0.005 0.002 0.000 0.009 1.3767 0.005 0.002 0.000 0.009 1.4000 0.005 0.002 0.000 0.009 1.4233 0.005 0.002 0.000 0.009 1.4467 0.005 0.002 0.000 0.009 1.4700 0.005 0.002 0.000 0.009 1.4933 0.005 0.002 0.000 0.009 1.5167 0.005 0.002 0.000 0.009 1.5400 0.005 0.002 0.000 0.009 1.5633 0.005 0.002 0.000 0.009 1.5867 0.005 0.002 0.000 0.009 1.6100 0.005 0.003 0.000 0.009 1.6333 0.005 0.003 0.000 0.009 1.6567 0.005 0.003 0.000 0.009 1.6800 0.005 0.003 0.000 0.009 1.7033 0.005 0.003 0.000 0.009 1.7267 0.005 0.003 0.000 0.009 1.7500 0.005 0.003 0.000 0.009 1.7733 0.005 0.003 0.000 0.009 1.7967 0.005 0.003 0.000 0.009 1.8200 0.005 0.003 0.000 0.009 1.8433 0.005 0.003 0.000 0.009 1.8667 0.005 0.003 0.000 0.009 WESTERN ENGINEERS, INC. 23 PROJECT: 20-1868-A HARRIS DUPLEX 1.8900 0.005 0.003 0.000 0.009 1.9133 0.005 0.003 0.000 0.009 1.9367 0.005 0.003 0.000 0.009 1.9600 0.005 0.003 0.000 0.009 1.9833 0.005 0.003 0.000 0.009 2.0067 0.005 0.003 0.002 0.009 2.0300 0.005 0.003 0.027 0.009 2.0533 0.005 0.003 0.064 0.009 2.0767 0.005 0.003 0.110 0.009 ANALYSIS RESULTS Stream Protection Duration Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.049 Total Impervious Area:O Mitigated Landuse Totals for POC #1 Total Pervious Area:O Total Impervious Area:0.049 Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.001976 5 year 0.003522 10 year 0.004886 25 year 0.007066 50 year 0.009067 100 year 0.011432 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 WESTERN ENGINEERS, INC. 24 PROJECT: 20-1868-A HARRIS DUPLEX WWHM Rain Garden Sizing Calculation WESTERN ENGINEERS, INC. 25 PROJECT: 20-1868-A HARRIS DUPLEX WWHM2012 PROJECT REPORT Project Name: 20-1868-A dwy rain garden DOT Site Name: Site Address: City Report Date: 5/5/2021 MGS Regoin Puget East Data Start 1901/10/1 Data End : 2058/09/30 DOT Data Number: 03 Version Date: 2019/09/13 Version : 4.2.17 PREDEVELOPED LAND USE Name : Dwy Predev Bypass: No Groundwater: No Pervious Land Use acre C, Lawn, Flat .022 Pervious Total 0.022 Impervious Land Use acre Impervious Total 0 Basin Total 0.022 MITIGATED LAND USE Name : Dwy Dev Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre DRIVEWAYS FLAT 0.022 Impervious Total 0.022 Basin Total 0.022 Element Flows To: Surface Interflow Surface Rain Garden Surface Rain Garden Groundwater WESTERN ENGINEERS, INC. 26 PROJECT: 20-1868-A HARRIS DUPLEX Name : Driveway Rain Garden Bottom Length: 3.00 ft. Bottom Width: 3.00 ft. Material thickness of first layer: 1.5 Material type for first layer: SMMWW 12 in/hr Material thickness of second layer: 0 Material type for second layer: Sand Material thickness of third layer: 0 Material type for third layer: GRAVEL Infiltration On Infiltration rate: 1.6 Infiltration safety factor: 1 Wetted surface area On Total Volume Infiltrated (ac-ft.): 8.729 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 8.729 Percent Infiltrated: 100 Total Precip Applied to Facility: 0.558 Total Evap From Facility: 0.184 Underdrain not used Discharge Structure Riser Height: 0.5 ft. Riser Diameter: 6 in. Element Flows To: Outlet 1 Outlet 2 Driveway Rain Garden Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.003306 0.000000 0.0000 0.0000 0.0275 0.003252 0.000003 0.0000 0.0000 0.0549 0.003162 0.000006 0.0000 0.0000 0.0824 0.003074 0.000009 0.0000 0.0000 0.1099 0.002987 0.000013 0.0000 0.0000 0.1374 0.002901 0.000017 0.0000 0.0000 0.1648 0.002817 0.000021 0.0000 0.0000 0.1923 0.002734 0.000026 0.0000 0.0000 0.2198 0.002652 0.000031 0.0000 0.0000 0.2473 0.002571 0.000037 0.0000 0.0001 0.2747 0.002491 0.000043 0.0000 0.0001 0.3022 0.002413 0.000049 0.0000 0.0001 0.3297 0.002336 0.000056 0.0000 0.0002 0.3571 0.002261 0.000064 0.0000 0.0002 0.3846 0.002186 0.000071 0.0000 0.0003 0.4121 0.002113 0.000080 0.0000 0.0003 0.4396 0.002041 0.000089 0.0000 0.0004 0.4670 0.001970 0.000098 0.0000 0.0005 0.4945 0.001901 0.000108 0.0000 0.0006 0.5220 0.001832 0.000119 0.0000 0.0008 0.5495 0.001765 0.000130 0.0000 0.0009 0.5769 0.001700 0.000142 0.0000 0.0011 0.6044 0.001635 0.000154 0.0000 0.0013 0.6319 0.001572 0.000167 0.0000 0.0015 0.6593 0.001510 0.000181 0.0000 0.0018 WESTERN ENGINEERS, INC. 27 PROJECT: 20-1868-A HARRIS DUPLEX 0.6868 0.001449 0.000195 0.0000 0.0019 0.7143 0.001390 0.000210 0.0000 0.0020 0.7418 0.001331 0.000226 0.0000 0.0021 0.7692 0.001274 0.000242 0.0000 0.0021 0.7967 0.001219 0.000259 0.0000 0.0022 0.8242 0.001164 0.000277 0.0000 0.0023 0.8516 0.001111 0.000295 0.0000 0.0024 0.8791 0.001059 0.000315 0.0000 0.0025 0.9066 0.001008 0.000335 0.0000 0.0026 0.9341 0.000958 0.000356 0.0000 0.0027 0.9615 0.000910 0.000378 0.0000 0.0028 0.9890 0.000863 0.000400 0.0000 0.0030 1.0165 0.000817 0.000424 0.0000 0.0031 1.0440 0.000773 0.000448 0.0000 0.0032 1.0714 0.000730 0.000473 0.0000 0.0033 1.0989 0.000688 0.000499 0.0000 0.0034 1.1264 0.000647 0.000526 0.0000 0.0035 1.1538 0.000607 0.000554 0.0000 0.0036 1.1813 0.000569 0.000583 0.0000 0.0038 1.2088 0.000532 0.000613 0.0000 0.0039 1.2363 0.000496 0.000644 0.0000 0.0040 1.2637 0.000461 0.000675 0.0000 0.0041 1.2912 0.000428 0.000708 0.0000 0.0043 1.3187 0.000396 0.000742 0.0000 0.0044 1.3462 0.000365 0.000777 0.0000 0.0045 1.3736 0.000336 0.000813 0.0000 0.0047 1.4011 0.000307 0.000850 0.0000 0.0048 1.4286 0.000280 0.000888 0.0000 0.0050 1.4560 0.000255 0.000927 0.0000 0.0051 1.4835 0.000230 0.000967 0.0000 0.0052 1.5000 0.000207 0.000992 0.0000 0.0053 Surface Rain Garden Hydraulic Table Stage feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) To Amended(cfs) Wetted Surface 1.5000 0.003306 0.000992 0.0000 0.0025 0.0001 1.5275 0.003397 0.001084 0.0000 0.0025 0.0003 1.5549 0.003490 0.001179 0.0000 0.0026 0.0004 1.5824 0.003584 0.001276 0.0000 0.0026 0.0006 1.6099 0.003679 0.001376 0.0000 0.0027 0.0008 1.6374 0.003775 0.001478 0.0000 0.0027 0.0009 1.6648 0.003873 0.001583 0.0000 0.0028 0.0011 1.6923 0.003972 0.001691 0.0000 0.0028 0.0012 1.7198 0.004072 0.001801 0.0000 0.0029 0.0014 1.7473 0.004174 0.001915 0.0000 0.0029 0.0016 1.7747 0.004276 0.002031 0.0000 0.0030 0.0017 1.8022 0.004380 0.002150 0.0000 0.0030 0.0019 1.8297 0.004485 0.002272 0.0000 0.0030 0.0021 1.8571 0.004592 0.002396 0.0000 0.0031 0.0022 1.8846 0.004699 0.002524 0.0000 0.0031 0.0024 1.9121 0.004808 0.002654 0.0000 0.0032 0.0026 1.9396 0.004919 0.002788 0.0000 0.0032 0.0028 1.9670 0.005030 0.002925 0.0000 0.0033 0.0030 1.9945 0.005143 0.003064 0.0000 0.0033 0.0031 2.0220 0.005257 0.003207 0.0173 0.0033 0.0033 2.0495 0.005372 0.003353 0.0580 0.0033 0.0035 2.0769 0.005488 0.003502 0.1109 0.0033 0.0037 2.1044 0.005606 0.003655 0.1701 0.0033 0.0039 WESTERN ENGINEERS, INC. 28 PROJECT: 20-1868-A HARRIS DUPLEX 2.1319 0.005725 0.003810 0.2299 0.0033 0.0041 2.1593 0.005845 0.003969 0.2845 0.0033 0.0043 2.1868 0.005966 0.004132 0.3293 0.0033 0.0045 2.2143 0.006089 0.004297 0.3619 0.0033 0.0047 2.2418 0.006213 0.004466 0.3840 0.0033 0.0049 2.2692 0.006338 0.004639 0.4086 0.0033 0.0051 2.2967 0.006464 0.004814 0.4289 0.0033 0.0053 2.3242 0.006592 0.004994 0.4483 0.0033 0.0055 2.3516 0.006721 0.005177 0.4669 0.0033 0.0057 2.3791 0.006851 0.005363 0.4848 0.0033 0.0059 2.4066 0.006982 0.005553 0.5021 0.0033 0.0061 2.4341 0.007115 0.005747 0.5188 0.0033 0.0064 2.4615 0.007249 0.005944 0.5349 0.0033 0.0066 2.4890 0.007384 0.006145 0.5506 0.0033 0.0067 2.5000 0.007438 0.006226 0.5659 0.0033 0.0000 Name : Surface Rain Garden Element Flows To: Outlet 1 Outlet 2 Driveway Rain Garden ANALYSIS RESULTS Stream Protection Duration Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.022 Total Impervious Area:O Mitigated Landuse Totals for POC #1 Total Pervious Area:O Total Impervious Area:0.022 Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.000887 5 year 0.001581 10 year 0.002194 25 year 0.003173 50 year 0.004071 100 year 0.005133 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 WESTERN ENGINEERS, INC. 29 PROJECT: 20-1868-A HARRIS DUPLEX Minimum Requirement # 6: Runoff Treatment Due to less than 5,000 sf of pollution generating hard surfaces and less than 3/4 of an Acre of pollution -generating pervious surfaces, runoff treatment is not required. Minimum Requirement # 7: Flow Control Due to the project proposing less than 5,000 sf. new/replace hardscape and less than 3/4 acres conversion of native vegetation to lawn, flow control requirements do not apply. Total Property Area On -Site Clearing: Off -Site Disturbance: Total Clearing Area: = 7,444 sf. (0.171 Acres) = 7,032 s£ (0.161 Acres) = 247 sf. (0.006 Acres) = 7,279 sf. (0.167 Acres) Existing: On -Site Hardscape Existing House (TBR) = 1,276 sf. Existing Concrete Driveway (TBR) = 2,894 sf. Existing Deck (TBR) = 416 sf. Total = 4,586 sf. (0.105 Acres) On -Site Vegetation Existing Lawn = 2,858 sf. (0.066 Acres) Developed: On -Site Hardscape *Proposed Driveway = 735 sf. *Proposed Front Walks = 200 sf. *Proposed Patio = 126 sf. Proposed Duplex = 2,135 sf. Total = 3,196 sf. (0.073 Acres) Off -Site Hardscape Proposed Driveway Entrance = 247 sf. Total = 247 sf. (0.006 Acres) Total New/Replaced Hardscape = 3,443 sf. *Note: Does not include areas under roof eaves. On -Site Vegetation Proposed Amended Lawn Existing Lawn to Remain 3,836 sf. (0.088 Acres) 412 sf. (0.010 Acres) WESTERN ENGINEERS, INC. 30 PROJECT: 20-1868-A HARRIS DUPLEX Minimum Requirement # 8: Wetland Protection No known wetlands onsite, however potential downstream wetlands will be protected with onsite BMP's. Wetland protection is not required. WESTERN ENGINEERS, INC. 31 PROJECT: 20-1868-A Table V-A.2: Maintenance Standards - Infiltration Maintenance Component Defect Conditions When Maintenance Is Needed Results Expected When Maintenance Is Per- formed See Table V-A.1: Maintenance Standards - Deten- Trash & Debris See Table V-A.1: Maintenance Standards - Detention Ponds tion Ponds Poisonous/Noxious See Table V.A.1: Maintenance Standards - Deten- General Vegetation See Table V-A.1: Maintenance Standards - Detention Ponds lion Ponds Contaminants and Pol• See Table V•A.1, Maintenance Standards - Deten- lution See Table V-A.1: Maintenance Standards -Detention Ponds tion Ponds See Table V-A.1: Maintenance Standards - Deten- Rodent Holes See Table V-A.1: Maintenance Standards - Detention Ponds tion Ponds Water pondng in infiltration pond after rainfall ceases and appropriate time allowed for infiltration. Treatment basins should infiltrate Sediment is removed and/or facility is cleaned so Storage Area Sediment Water Quality Design Storm Volume within 48 hours, and empty within 24 hours after cessation of most rain events. that infiltration system works according to design. Table V-A.2: Maintenance Standards - Infiltration (continued) Maintenance Component Defect Conditions When Maintenance Is Needed Results Expected When Maintenance Is Per- formed (A percolation test pit or test of facility indicates facility is only working at 90% of its designed capabilities. Test every 2 to 5 years. If two inches or more sediment is present, remove). Filter Bags (if applicable) DIIwith Sediment and Sediment and debris fill bag more than 112 full. Filter bag is replaced or system is redesigned. ebris Rock Filters Sediment and Debris By visual inspection, little or no waterflows through filter during heavy rain storms. Gravel in rock filter is replaced. Side Slopes of Pond Erosion See Table V-A.1: Maintenance Standards - Detention Ponds See Table V-A.1: Maintenance Standards - Deten- tion Ponds Tree Growth See Table V-A.1: Maintenance Standards - Detention Ponds See Table V-A.1: Maintenance Standards - Deten- Emergency Overflow Spillway tion Ponds and Berms over 4 feet in height. See Table V-A.1: Maintenance Standards - Deten- See Table V-A.1: Maintenance Standards -Detention Ponds Lion Ponds tion See Table V-A.1: Maintenance Standards - Deten- Emergency Overflow Spillway Rock Missing See Table V-A.1: Maintenance Standards - Detention Ponds tion Ponds Erosion See Table V-AA Maintenance Standards - Detention Ponds See Table V-A.1: Maintenance Standards - Deten- tion Ponds Facility or sump filled Pre -settling Ponds and Vaults with Sediment and/or 6" or desgned sediment trap depth of sediment. Sediment is removed. debris r1 Table V-A.S: Maintenance Standards - Catch Basin, Maintenance Defect Conditions When Maintenance is Needed Results Expected When Maintenance is per - Component formed 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%. No Trash or debris located immediately in front of Trash or debris (in the basin) that exceeds 60 percent of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the catch basin or on grate opening_ basin, but in no case less than a minimum of six inches clearance from the debris surface to the invert of the lowest pipe. No trash or debris in the catch basin. Trash & Debris Trash or debris in a inlet or outlet blockin more than 113 of its height. any pipe 9 9h Inlet and outlet pipes free of trash or debris. Dead animals or vegetation that could generate odors that could cause complaints or dangerous gases (e.g., methane). No dead animals or vegetation present within the catch basin. Sediment (in the basin) that exceeds 60 percent of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the Sediment 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 General Structure Damage to To 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 P 9 q ( 9 ) Top slab is free of holes and cracks. Frame and/or Top Slab Frame not sitting flush on top slab. Le-, separation of more than 314 inch of the frame from the top slab. Frame not securely attached Frame is sitting flush on the riser rings or top slab and firmly attached. Fractures or Cracks in Maintenance person judges that structure is unsound. Basin replaced or repaired to design standards. Basin Walls/ Bottom 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 Pipe is regrouted and secure at basin wall. catch basin through cracks. Settlement/ Mis- If failure of basin has created a safety, function, or design problem. Basin replaced or repaired to design standards. alignment Vegetation growing across and blocking more than 10% of the basin opening- No vegetation blocking opening to basin. Vegetation Vegetation growing in inleVoutlet pipe joints that is more than six inches tall and less than six inches apart. No vegetation or root growth present. Contamination and Pol- lution See Table V-A.1: Maintenance Standards -Detention Ponds No pollution present. 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 Catch Basin Locking Mechanism 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 Not Working Cover Difficult to One maintenance person cannot remove lid after applying normal lifting pressure. Cover can be removed by one maintenance per - Remove (Intent is keep coverfrom sealing off access to maintenance.) son_ Ladder Ladder Rungs Unsafe Ladder is unsafe due to missing rungs, not securely attached to basin wall, misalignment, nut, cracks, or sharp edges. Ladder meets design standards and allows main- tenance person sale access. Grate opening Unsafe Grate with opening wider than 7/8 inch. Grate opening meets design standards. Metal Grates Trash and Debris Trash and debris that is blocking more than 20 % of grate surface inletting capacity. Grate free of trash and debris. (If Applicable) Damaged or Missing. Grate missing or broken member(s) of the grate. Grate is in place, meets the design standards. anc is installed and aligned with the flow path. HARRIS DUPLEX BMP T5.13 Post -Construction Soil Quality and Depth Maintenance • Soil quality and depth should be established toward the end of construction and once established, should be protected from compaction (i.e. from large machinery use and/or erosion) • Soil should be planted and mulched after installation. • Plant debris or its equivalent should be left on the soil surface to replenish organic matter. WESTERN ENGINEERS, INC. 34 PROJECT: 20-1868-A HARRIS DUPLEX APPENDIX I Drainage Plan WESTERN ENGINEERS, INC. 35 PROJECT: 20-1868-A 716'.1917,7JVNIhIQ 77VM90WY9 77V,730 NOLLN373N0790Vd AVM3AiN0 M NOLMS Alylyht�I'319r1 • �� vos-°s iro>3°a3a xninry .r Oe9 vo oe�9 sv or -so � as svr-n3ra 7IVJ:l MHVD °s x°u 3 a° M31ANtl dONI N d NIVH N A MJAIHG MHN rsar xavaev w lava �x�l (xlw.') rame3uava rcu� nxj ®3�,snx�� NI 91g1 A3 �a n99 9 N� 71V13(l 7734AW SMV80 OM100d 71V. G TEMA80N1V8077VM °3xsrx r-:fi ,s nrr xawam ar�rma/ m°i NOIIMIO7f J'ItlJYdNy 3dYJSQNtlN f'uS 'waovs 'x3xss -W s3 11.1- axe (- Al 3 s vxr vs ro xoura3eas 'S910N 53111'1110 SiLON 30tlNItlYO - 'eoae �ro _ mr-�rvlaw'rr 9aWmi �� 'sn°"fM�rxlaa.a r x°xsai —J <� .0 n .Zp) r s Z \ ar � M1aAS.tar I(9nwi .r) xs muaraae9r[0/ae1 10£iZ� S09-OS IN13a 1N3111HVd30 aavaNvls SMNOM (0w 5 0 N30aV0 SONOYY03 jo d0 A110 NIV8 NIVa 1V01dA1 (nixm 1B mnb 53� ORIxINxS 5i13N.W0 a0! +IUxTB Wn0'IGXr40-6 >3e5 e00A OL na0ix0� ssa�'as�e'x re�uuwmw �'axew memnuls uo »oou� mNsw xu. macww ao (i.s-as n ) as�ru»n 3e ima raw wieuv-n v vww Yclnco-s -ovs aimv °v nawNw i*wrs a»v xnma n>cvr. t 'c• nee: aavo mNixm v as Tres 3eoa nw Naimu rvnniNin 'zaxrN° wvew rxruuN 2 3aLL HNMN-NON 'xOYvtlMS a0i 31Yn31039 YlX'tt-6 '�3a5 r0°SN. Ot WOINOJ 1Tx5 3Vl%3r03� 'I MOIA83 Gjdld tl3e'gOEM NH�M w)Uso-e �xs uasN. ux +�oao ce e33xs vim 3em ur/ao aNe IwU .• N0115N '�gOtl Nnrep Ul6�M Ww1 .9 II � II nn�e oa+a 33tlf .• aas Two9m0 a3e x x • 3i �]35 1A�w �1fbM Sx 110N 31 s � NLUSAs snOdSNAioQ �oo� IZ NO,LONIHSYA1 `SQNON(Ig90AM m `avo'x n�z'z `oz'o�s `b/r Ms `P/r mS L"-OS im3a IMKLWd3a am ms sm" omnd S3NOZ ONI1NVId N308VOONOR03 Jo AID 3oc NIVH ONV NOUN31 8018 ryx ruvn°eu xov3as°3 rvawn3°w sss �3°wusawrn aurarnsxnuoo arui L+3 °r�3e r sa IN w a'tls®Nr (5 1 Is a0 Ar la 013) - of 1N I r s9xux✓Ia AO dOl aasxa su°wou°a Sus aw ruurvx°avaa �viaa°aaaa uax °i °v.°nss se _5310N 1V2J3N3O 53NOZ ONIlNVId IVOIdAd in° ea wiee� A6;fd �'IIdZHO HJN8Ud3NOLLdUZ7IdNI .ssarHs'xbm,9 a v»Ys'na)xd,9 x exns/MreJ 3. 3,1 �00 'S3LONNOfltlN0.IS3N1N3W3A0NANf 30tlLN0Yd xe�'.w 3>an 3ucua sro axN°aJ s3unun u° 3w w siunun ury in vxr 3sw,3s affirm wvu3e xvura3e3s-rrwvs9loN A1IT110 HARRIS DUPLEX APPENDIX II SOIL INFORMATION WESTERN ENGINEERS, INC. 37 PROJECT: 20-1868-A HARRIS DUPLEX SOIL LOG INFO Soil log investigation was provided by Cobalt Geosciences, on March 24, 2020. Soil Loy Info: Test Pit 1 (TP 1) 0"-811 : TopsoilNegetation 8"-4895: Loose to Medium Dense, Silty -Fine to Medium Grained Sand with Gravel, Yellowish Brown, Moist. (Weathered Advance Outwash) 48"-120": Medium Dense to Dense, Fine to Medium Grained Sand with Gravel, Grayish Brown, Moist. (Advance Outwash) No groundwater was encountered. WESTERN ENGINEERS, INC. 38 PROJECT: 20-1868-A Snohomish County Area, Washington (WA661) Snohomish County Area, Washington (WA661) Map Aces percent Unit Map Unit Name m of AOI Symbol AOI 5 Alderwood-Urban 0.2 100.0% land complex, 2 to 8 percent slopes Totals for Area of 0.2 100.046 Interest H HARRIS DUPLEX Snohomish County Area, Washington 5—Alderwood-Urban land complex, 2 to 8 percent slopes Map Unit Setting • National map unit symbol: 2hz9 • Elevation: 50 to 800 feet • Mean annual precipitation: 25 to 60 inches • Mean annual air temperature: 48 to 52 degrees F • Frost -free period: 180 to 220 days • Farmland classification: Not prime farmland Map Unit Composition • Alderwood and similar soils: 60 percent • Urban land: 25 percent • Minor components: 15 percent • Estimates are based on observations, descriptions, and transects of the mapunit. Description of Alderwood Setting • Landform: Till plains • Parent material: Basal till Typical profile • H1 - 0 to 7 inches: gravelly ashy sandy loam • H2 - 7 to 35 inches: very gravelly ashy sandy loam • H3 - 35 to 60 inches: gravelly sandy loam Properties and qualities • Slope: 2 to 8 percent • Depth to restrictive feature: 20 to 40 inches to densic material • Natural 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 storage in profile: Low (about 3.0 inches) Interpretive groups • Land capability classification (irrigated): None specified • Land capability classification (nonirrigated): 4s • Hydrologic Soil Group: B • Forage suitability group: Limited Depth Soils (G002XN302WA) • Hydric soil rating: No Minor Components Mckenna • Percent of map unit: 5 percent • Landform: Depressions • Hydric soil rating: Yes Norma, undrained • Percent of map unit: 5 percent • Landform: Depressions • Hydric soil rating: Yes WESTERN ENGINEERS, INC. 40 PROJECT: 20-1868-A HARRIS DUPLEX Terric medisaprists, undrained Percent of map unit: 5 percent Landform: Depressions Hydric soil rating: Yes WESTERN ENGINEERS, INC. 41 PROJECT: 20-1868-A HARRIS DUPLEX APPENDIX III SOIL AMENDMENT WESTERN ENGINEERS, INC. 42 PROJECT: 20-1868-A ,•1 IN ■ pEftre qr lM� �n slim Building Summary � 1 ■ �■1f lt>( Ad Soil ri Soil quality is directly related to stormwater detention capacity, and so to�i'�", the health of streams and aquatic resources in the Pacific Northwest. Soil quality also determines landscape success: plant survival, growth, �,,,� disease resistance, and maintenance needs. This publication provides guidance for landscape designers, builders, planners, and inspectors to implement soil quality "Best Management Practices" (or BMPs), in order to protect and restore soil functions. The AMW guide describes techniques for construction site soil handling, reducing soil compaction, and amending site soils with compost to meet BMP� T5.13 "Post Construction Soil Quality and Depth" in the WA Dept. of Ecology's Stormwater Management Manual for Western Washington. This guide also includes field inspection techniques, WA suppliers of compost and soil testing laboratories, and specification language in amene APWA and CSI formats. 9 119I nI_ Now" , Building Soil: Guidelines and Resources for Implementing Soil Quality and Depth BMP T5.13 in WDOE Stormwater Management Manual for Western Washington 1 st edition 2003 2°a edition 2005 2°a edition, 2007 printing (web links updated no other changes) 2"d edition, 2009 printing (web links, and compost suppliers and laboratories lists updated — no other changes) 2❑d edition, 2010 printing (web links updated — no other changes) 3`d edition, 2012 (Ecology's 2012 revised BMP text, compost suppliers, and web links updated) 41" edition, 2016 (Ecology's 2014 revised BMP text, and web links updated) This publication is provided to help professionals in the land development and landscape industries understand and implement the new Washington State Department of Ecology "Best Management Practice" (BMP) for soil quality, designed to improve stormwater retention and water quality. The specifications, procedures and forms contained in this publication were developed by a team of landscape professionals, municipal inspectors, soil scientists and public agency staff. They are provided as examples of the tools needed to implement the State's soil quality BMP. This manual, specifications, and resources are available online at www.SoilsforSalmon.org and along with factsheets for builders at www.BuildingSoil.org CONTENTS SECTION ONE SECTION TWO SECTION THREE SECTION FOUR SECTION FIVE SECTION SIX SECTION SEVEN CREDITS The Role of Soil Quality in Stormwater Management BMP T5.13 "Post Construction Soil Quality and Depth" from the DOE Stormwater Management Manual for Western Washington Summary of Steps for Implementing BMP T5.13 Amendment Options Developing a Soil Management Plan Model "Soil Management Plan" form (for permit applications) Field Guide to Verifying Soil Quality and Depth Model "Field Inspection" form Resources Calculating Custom Amendment Rates: Formula & Spreadsheet Permitted Composting Facilities in Washington Soil and Compost Analytical Labs Serving the Northwest Additional Resources on Compost Quality and Use, and the Role of Soil Quality in Stormwater Management Model Soil Amendment Specifications: APWA and CSI Formats DEVELOPMENT AND FIRST EDITION FUNDING: Snohomish County Public Works Department PROJECT MANAGER: Sego Jackson, Snohomish County Public Works Department MANUAL LEAD AUTHOR: Howard Stenn, Stenn Design, Vashon, WA TECHNICAL ASSISTANCE — AMENDMENT CALCULATIONS: Dr. Craig Cogger, Washington State University -Puyallup TECHNICAL ASSISTANCE — SPECIFICATIONS: Jeff Girven, The Berger Partnership, Seattle, WA TECHNICAL ASSISTANCE & EDITING — SECOND EDITION: David McDonald, Seattle Public Utilities FIRST EDITION GRAPHIC DESIGN: Partners in Design, Seattle, WA ILLUSTRATIONS/PHOTOS: Courtesy of King County Department of Natural Resources and Parks, and Seattle Public Utilities SECOND EDITION GRAPHIC DESIGN AND FUNDING: Seattle Public Utilities THE ROLE OF SOIL QUALITY IN STORMWATER MANAGEMENT The Benefits of Healthy Soil Healthy soil provides important stormwater management functions including efficient water infiltration and storage, adsorption of excess nutrients, filtration of sediments, biological decomposition of pollutants, and moderation of peak stream flows and temperatures. In addition, healthy soils support vigorous plant growth that intercepts rainfall, returning much of it to the sky through evaporation and transpiration. Rapid urbanization of forest and farmland in the Puget Sound basin has severely degraded soil capacity to absorb, filter and store rainwater; and support vigorous plant growth. Common development practices include removal of topsoil during grading and clearing, compaction of remaining soil, and planting into unimproved soil or shallow depths of poor quality imported topsoil. These conditions typically produce unhealthy plants that require excessive fertilizers and pesticides, further contaminating runoff. Native Soil , so°r° evapo- .. tr nspiration - _ _ - 35% surface water o etained/infiltrated a h II 1 Topsoil � surfacee water --- runoff Subsoil Groundwater ..... ... Bedrock ti- Stormwater management functions of healthy soils: • Provides high rates of water infiltration and retention • Minimizes surface water runoff and erosion • Traps sediments, heavy metals and excess nutrients; and biodegrades chemical contaminants • Encourages vigorous protective vegetative cover • Supports beneficial soil life that fight pests and disease, and supply plant nutrients — reducing need for fertilizers and pesticides that may contaminate waterways. Disturbed Soil ev p . tra pi tion 0% rainfall detained s°/° 55-70% surface water surface water runoff detained/ ❑ icarnes peniades. infiltrated silt and animal waste) b ��✓ Groundwater Bedrock During development, soil functions are often impaired by topsoil loss and compaction: • Decreases surface water infiltration and storage • Increases surface water runoff, including contamination from roadways and yards. • Increases erosion and flooding. • Reduces beneficial soil life • Impairs plant growth, pest and disease resistance • Increases landscape needs for irrigation, fertilizers, and pesticides, which further increases surface water pollution. 2 Healthy Soil and Stormwater Management — SECTION ONE Where the Rain Goes — The Regional Impact of Urbanization on Stormwater Flows 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0%- Forest Pasture Suburban City Evapotranspiration}{ Interflow* Groundwater N Surface Runoff *water that travels just below the surface These changes, plus the listing of some Puget Sound salmon runs as "threatened" under the Endangered Species Act, has stimulated examination of alternative practices to preserve and restore the soil's stormwater and water quality functions. Low Impact Development (LID) practices that improve on -site management of storm water runoff include: • Minimizing impervious surfaces, • Preserving native soil and vegetation, and • Establishing minimum soil quality and depth standards in landscaped areas. Amending soils with compost or other organic materials can restore soil functions: • Restores soil water infiltration and storage capacities • Decreases surface water runoff and erosion • Traps sediments, heavy metals and excess nutrients; and biodegrades chemical contaminants • Rebuilds the beneficial soil life that fights pests and disease, and supplies plants with nutrients and water • Improves plant health, with reduced need for additional water, fertilizers and pesticides • Aids deep plant root growth and vigorous vegetative cover. Illustrations for this section were created by the King County Department of Natural Resources and Parks 3 BMP T5.13 "POST CONSTRUCTION SOIL QUALITYAND DEPTH" IN THE STORMWATER MANAGEMENT MANUAL FOR WESTERN WASHINGTON Excerpted from the Washington State Department of Ecology's Stormwater Management Manual for Western Washington, Vol. V. Runoff Treatment BMPs, Chapter 5, pages 5-8 to 5-11 (or pages 105 to 108 in the online PDF file) as revised December 2014. "BMP" means "Best Management Practice'; a term used for techniques that are recommended or (in this case) required. The Manual can be found online at www.ecy.wa.gov/programs/wq/stormwater/manual.html Purpose and Definition Naturally occurring (undisturbed) soil and vegetation provide important stormwater functions including: water infiltration; nutrient, sediment, and pollutant adsorption; sediment and pollutant biofiltration; water interflow storage and transmission; and pollutant decomposition. These functions are largely lost when development strips away native soil and vegetation and replaces it with minimal topsoil and sod. Not only are these important stormwater functions lost, but such landscapes themselves become pollution generating pervious surfaces due to increased use of pesticides, fertilizers and other landscaping and household/industrial chemicals, the concentration of pet wastes, and pollutants that accompany roadside litter. Establishing soil quality and depth regains greater stormwater functions in the post development landscape, provides increased treatment of pollutants and sediments that result from development and habitation, and minimizes the need for some landscaping chemicals, thus reducing pollution through prevention. Applications and Limitations Establishing a minimum soil quality and depth is not the same as preservation of naturally occurring soil and vegetation. However, establishing a minimum soil quality and depth will provide improved on -site management of stormwater flow and water quality. Soil organic matter can be attained through numerous materials such as compost, composted woody material, biosolids, and forest product residuals. It is important that the materials used to meet the soil quality and depth BMP be appropriate and beneficial to the plant cover to be established. Likewise, it is important that imported topsoils improve soil conditions and do not have an excessive percent of clay fines. This BMP can be considered infeasible on till soil slopes greater than 33 percent. Design Guidelines Soil retention. Retain, in an undisturbed state, the duff layer and native topsoil to the maximum extent practicable. In any areas requiring grading remove and stockpile the duff layer and topsoil on site in a designated, controlled area, not adjacent to public resources and critical areas, to be reapplied to other portions of the site where feasible. Soil quality. All areas subject to clearing and grading that have not been covered by impervious surface, incorporated into a drainage facility or engineered as structural fill or slope shall, at project completion, demonstrate the following: 1) A topsoil layer with a minimum organic matter content of 10% dry weight in planting beds, and 5% organic matter content in turf areas, and a pH from 6.0 to 8.0 or matching the pH of the undisturbed soil. The topsoil layer shall have a minimum depth of eight inches except where tree roots limit the depth of incorporation of amendments needed to meet the criteria. Subsoils below the topsoil layer should be scarified at least 4 inches with some incorporation of the upper material to avoid stratified layers, where feasible. 2) Mulch planting beds with 2 inches of organic material. 3) Use compost and other materials that meet these organic content requirements: a) The organic content for "pre -approved" amendment rates can be met only using compost meeting the compost specification for Bioretention (BMP T7.30), with the exception that the compost may have up to 35% biosolids or manure. The compost must also have an organic matter content of 40% to 65%, and a carbon to nitrogen ratio below 25:1. The carbon to nitrogen ratio may be as high as 3 5: 1 for plantings composed entirely of plants native to the Puget Sound Lowlands region. b) Calculated amendment rates may be met through use of composted material meeting (a.) above; or other organic materials amended to meet the carbon to nitrogen ratio requirements, and not exceeding the contaminant limits identified in Table 220-13, Testing Parameters, in WAC 173- 350-220. The resulting soil should be conducive to the type of vegetation to be established. Editor's note: "other organic materials" includes other composts not meeting the stringent specification in BMP T5.30, which is designed for bioretention swales. Any mature, stable compost is appropriate for general soil amendment. 4 BMP T5.13 "Post Construction Soil Quality and Depth" — SECTION TWO Implementation Options. The soil quality design guidelines listed above can be met by using one of the methods listed below: 1) Leave undisturbed native vegetation and soil, and protect from compaction during construction. 2) Amend existing site topsoil or subsoil either at default "pre -approved" rates, or at custom calculated rates based on tests of the soil and amendment. 3) Stockpile existing topsoil during grading, and replace it prior to planting. Stockpiled topsoil must also be amended if needed to meet the organic matter or depth requirements, either at a default "pre -approved" rate or at a custom calculated rate. 4) Import topsoil mix of sufficient organic content and depth to meet the requirements. More than one method may be used on different portions of the same site. Soil that already meets the depth and organic matter quality standards, and is not compacted, does not need to be amended. Planning/Permitting/I nspectionNerification Guidelines & Procedures Local governments are encouraged to adopt guidelines and procedures similar to those recommended in Guidelines and Resources For Implementing Soil Quality and Depth BMP T5.13 in WDOE Stormwater Management Manual for Western Washington. This document is available at: hlW://www.soilsforsalmon.org//pdf/Soil_BMP Manual.pdf Maintenance • Establish soil quality and depth toward the end of construction and once established, protect from compaction, such as from large machinery use, and from erosion. • Plant vegetation and mulch the amended soil area after installation. • Leave plant debris or its equivalent on the soil surface to replenish organic matter. • Reduce and adjust, where possible, the use of irrigation, fertilizers, herbicides and pesticides, rather than continuing to implement formerly established practices. Runoff Model Representation Areas meeting the design guidelines may be entered into approved runoff models as "Pasture" rather than "Lawn." Flow reduction credits can be taken in runoff modeling when BMP T5.13 is used as part of a dispersion design under the conditions described in: BMP T5.1013 Downspout Dispersion BMP T5.11 Concentrated Flow Dispersion BMP T5.12 Sheet Flow Dispersion BMP T5.18 Reverse Slope Sidewalks BMP T5.30 Full Dispersion (for public road projects) MULCH LOOSE SOIL • • with visible dark • organic matter :' I LOOSE OR FRACTURED SUBSOIL Alt Figure 5.3.3 — Planting bed Cross -Section (Reprinted from Guidelines and Resources For Implementing Soil Quality and Depth BMP T5.13 in WDOE Stormwater Management Manual for Western Washington, 2010, Washington Organic Recycling Council) Related BMP's in the same volume (Vol. V, Ch. 5) of the Stormwater Manaaement Manual for Western Washinaton available online at www.ecv.wa.aOV/Droarams/wa/stormwater/manual.html • BMP T5.40 Preserving Natural Vegetation • BMP T5.41 Better Site Design See also Chapters 7 and 9 in Volume V on Infiltration and Biofiltration/Bioretention BMPs and see Volume III, Appendix C "Low Impact Development Flow Modeling Guidance" 5 SUMMARY OF STEPS FOR IMPLEMENTING BMP T5.13 PROPOSED SPECIFICATION FOR PERMITTING AND INSPECTION TO IMPLEMENT BMP T5.13 "POST -CONSTRUCTION SOIL QUALITY AND DEPTH" The following approach to implementation of BMP T5.13 (BMP = Best Management Practice) in the Department of Ecology's Stormwater Manual has been developed with expert input and review. It is proposed as a practical methodology to implement the State's BMP guidelines. Proposed Soil Specifications These specifications are designed to achieve an 8 inch depth of soil with 10% "Soil Organic Matter" (SOM) content in planting beds, and 5% organic content in turf areas. Detailed amendment rates and procedures are described in Section 4 "Amendment Options," and in the specifications included in Section 7 "Resources". Developers may select from the following four options to meet the requirements: Option 1. Leave undisturbed native vegetation and soil, and protect from compaction during construction. Option 2. Amend existing site topsoil or subsoil either at "pre - approved" default rates, or at custom calculated rates based on tests of the soil and amendment. Option 3. Stockpile existing topsoil during grading, and replace it prior to planting. Stockpiled topsoil must also be amended if needed to meet the organic matter or depth requirements, either at a "pre -approved" default rate or at a custom calculated rate. Option 4. Import topsoil mix of sufficient organic content and depth to meet the requirements. f— Methods and Amendment Quality More than one treatment may be used on different areas of the same site. Soil that already meets the depth and organic matter quality standards, and is not compacted, does not need to be amended. • Compacted subsoils must be scarified at least 4 inches below the 8 inch deep amended layer (for a finished uncompacted depth of 12 inches). • Planting beds must be mulched with 2 inches of organic material. • Compost and other materials used to meet organic content must meet these standards: ➢ The organic content for "pre -approved" amendment rates can be met only using compost that meets the definition for "composted materials" in WAC 173-350, section 220, available online at www.ecy.wa.jzoy/programs/swfa/organics/soil.htrnl ■ The compost must also have an organic matter content of 35% to 65%, and a carbon to nitrogen ratio below 25:1. ■ The carbon to nitrogen ratio may be as high as 3 5: 1 for plantings composed entirely of plants native to the Puget Sound Lowlands region. ➢ Calculated amendment rates may be met through use of composted materials as defined above; or other organic materials amended to meet the carbon to nitrogen ratio requirements, and meeting the contaminant standards for "composted materials" in WAC 173-350-section 220. See Section 4 "Amendment Options," and Section 7 "Resources" for more on calculated amendment rates. Note: In Ecology's 2014 update (see page 4) they changed this to require a more tightly specified compost for `pre -approved" amendment rates. R Summary of Steps for Implementing BMPT5.13 — SECTION THREE Planning and Permitting A site specific Soil Management Plan (SMP — see Section Five "Guide to Developing a Soil Management Plan") must be approved as part of the clearing and grading or construction permit application. The Soil Management Plan (SMP) includes: • A scale -drawing (I I" X 17" or larger) identifying area where native soil and vegetation will be retained undisturbed, and which soil treatments will applied in landscape areas. • A completed SMP form identifying treatments and products to be used to meet the soil depth and organic content requirements for each area. Computations of compost or topsoil volumes to be imported (and/or site soil to be stockpiled) to meet "pre -approved" amendment rates; or calculations by a qualified professional to meet organic content requirements if using custom calculated rates. Qualified professionals include certified Agronomists, Soil Scientists or Crop Advisors; and licenced Landscape Architects, Civil Engineers or Geologists. • Copies of laboratory analyses for compost and topsoil products to be used, documenting organic matter contents and carbon to nitrogen ratios. Inspection and Verification Procedures (See also Section Six "Field Guide to Verifying Soil Quality and Depth in New Landscapes.") Inspection and verification should be performed by appropriate jurisdiction inspectors. Some verification may be made by supervising Landscape Architects or Civil Engineers, who submit signed certification that the approved SMP had been implemented. The following is an outline of a preferred inspection schedule and tasks: Depending on local resources and procedures, the inspection tasks may be consolidated into fewer visits. 1) Pre -Grading Inspection • Verify delineation and fencing off of native soils and vegetation to be left undisturbed, per the SMP. • Review the SMP with the general contractor to ensure that topsoil stockpiling and other specified measures are incorporated into the work plan. 2) Grading Progress Inspection • Verify that proper erosion control methods are being implemented. • Verify that excavation and stockpiling of native soils follows the SMP. • Verify that subgrades are consistent with the SMP. 3) Post -Construction Inspection Preferably prior to planting, so that omissions can easily be corrected: • Verify that compost, mulch, topsoil and amendment delivery tickets match volumes, types and sources approved in the SMP. If materials other than those approved in the SMP were delivered, submissions by the supplier should verify that they are equivalent to approved products. • Check soil for compaction, scarification and amendment incorporation by digging at least one 12 inch deep test hole per acre for turf and at least one per acre for planting beds. Test holes must be excavated using only a garden spade driven solely by inspector's weight. Test 10 locations per landscaped acre (10 locations minimum) for compaction, using a simple "rod penetrometer" (a 4 foot long 3/8th inch diameter stainless steel rod, with and a 30 degree bevel cut into the side at that goes in 1/8 inch at the tip). Rod must penetrate to 12" depth driven solely by inspector's weight (see illustration in Section 6). • Verify placement of two inches of organic mulch material on all planting beds. Secondary Verification For Failing Sites If inspector believes the installation does not meet the approved permit conditions, additional testing may be ordered to determine whether remediation steps are required prior to final occupancy and payment. An independent consultant (Certified Soil Scientist, Crop Advisor or Agronomist; or Licensed Landscape Architect, Civil Engineer or Geologist) should conduct the following additional sampling and analysis: • Organic matter content should be verified by an independent soil testing service, using the Loss On Ignition method. • If necessary, the percentage of fine particles (less than #200 mesh) should be confirmed by a certified Soil Laboratory using a wet sieve test. • At present, an analytical method for verifying scarification has not been identified. Verification may be a matter of professional opinion. 7 SECTION• ' AMENDMENT OPTIONS Select the soil preparation options that best suit each area of the project site. Either choose a pre -approved default amendment rate, or have a qualified professional calculate a custom rate based on soil and amendment tests described in Section 5, using the calculation method described in Section 7 "Resources"). OPTION 1: Leave native vegetation and soil undisturbed, and protect from compaction during construction. Identify areas of the site that will not be stripped, logged, graded or driven on, and fence off those areas to prevent impacts during construction. If neither soils nor vegetation are disturbed, these areas do not require amendment. OPTION 2: Amend existing site topsoil or subsoil either at default "pre -approved" rates, or at custom calculated rates based on specifier's tests of the soil and amendment. Scarification. Scarify or till subgrade to 8 inches depth (or to depth needed to achieve a total depth of 12 inches of uncompacted soil after calculated amount of amendment is added). Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. Amend soil to meet required organic content. A. Planting Beds B. Turf Areas 1. PRE -APPROVED RATE: Place 3 inches of 1. PRE -APPROVED RATE: Place 1.75 inches of composted material and rototill into 5 inches of composted material and rototill into 6.25 inches soil (a total amended depth of about 9.5 inches, of soil (a total amended depth of about 9.5 inches, for a settled depth of 8 inches). for a settled depth of 8 inches). 2. CALCULATED RATE: Place calculated amount 2. CALCULATED RATE: Place calculated amount of composted material or approved organic of composted material or approved organic material and rototill into depth of soil needed to material and rototill into depth of soil needed to achieve 8 inches of settled soil at 10% organic achieve 8 inches of settled soil at 5% organic content. content. Rake beds to smooth and remove surface rocks larger than Water or roll to compact to 85% of maximum dry density. 2 inches diameter. Rake to level, and remove surface woody debris and rocks Mulch planting beds with 2 inches of organic mulch. larger than 1 inch diameter. Amendment Options — SECTION FOUR OPTION 3: Stockpile existing topsoil during grading. Replace it before planting. Stockpiled topsoil must also be amended if needed to meet the organic matter or depth requirements, either at a pre -approved default rate or at a custom calculated rate. Scarification. If placed topsoil plus compost or other organic material will amount to less than 12 inches: Scarify or till subgrade to depth needed to achieve 12 inches of loosened soil after topsoil and amendment are placed. Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. Stockpile and cover soil with weed barrier material that sheds moisture yet allows air transmission, in approved location, prior to grading. Replace stockpiled topsoil prior to planting. Amend if needed to meet required organic content. A. Planting Beds B. Turf Areas 1. PRE -APPROVED RATE: Place 3 inches of 1. PRE -APPROVED RATE: Place 1.75 inches of composted material and rototill into 5 inches of composted material and rototill into 6.25 inches replaced soil (a total amended depth of about 9.5 of replaced soil (a total amended depth of about inches, for a settled depth of 8 inches). 9.5 inches, for a settled depth of 8 inches). 2. CALCULATED RATE: Place calculated amount 2. CALCULATED RATE: Place calculated amount of composted material or approved organic of composted material or approved organic material and rototill into depth of replaced soil material and rototill into depth of replaced soil needed to achieve 8 inches of settled soil at 10% needed to achieve 8 inches of settled soil at 5% organic content. organic content. Rake beds to smooth and remove surface rocks larger than Water or roll to compact soil to 85% of maximum dry 2 inches diameter. density. Mulch planting beds with 2 inches of organic mulch or Rake to level, and remove surface rocks larger than 1 inch stockpiled duff. diameter. OPTION 4: Import topsoil mix of sufficient organic content and depth to meet the requirements. Scarification. Scarify or till subgrade in two directions to 6 inches depth. Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. A. Planting Beds B. Turf Areas Use imported topsoil mix containing 10% organic matter Use imported topsoil mix containing 5% organic matter (typically around 40% compost). Soil portion must be sand (typically around 25% compost). Soil portion must be sand or sandy loam as defined by the USDA. or sandy loam as defined by the USDA. Place 3 inches of imported topsoil mix on surface and till Place 3 inches of imported topsoil mix on surface and till into 2 inches of soil. into 2 inches of soil. Place 3 inches of imported topsoil mix on surface and till Place second lift of 3 inches topsoil mix on surface. into 2 inches of soil. Water or roll to compact soil to 85% of maximum. Place second lift of 3 inches topsoil mix on surface. Rake to level, and remove surface rocks larger than 1 inch Rake beds to smooth, and remove surface rocks over 2 diameter. inches diameter. Mulch planting beds with 2 inches of organic mulch. SECTION GUIDE TO DEVELOPING A SOIL MANAGEMENT PLAN This section outlines steps for professional specifiers to prepare a Soil Management Plan (SMP) to meet the provisions of BMP T5.13 in the Department of Ecology's Stormwater Manual for Western Washington. The main steps to creating the SMP are: Step 1: Review Site Landscape Plans and Grading Plans. Examine all areas that will not be covered by structures, impervious surfaces, or stormwater detention / infiltration structures, to assess how grading will impact soil conditions and determine areas where different soil treatments may be applied. Those allowed soil treatment options are: Option 1: Areas where native soil and/or vegetation will be retained in place; Option 2: Areas where topsoil or subsoil will be amended in place; Option 3: Areas where topsoil will be stripped and stockpiled prior to grading for reapplication, and; Option 4: Areas where imported topsoil will be applied. Step 2: Visit Site to Determine Soil Conditions Working with plans, check the soil in each area to identify information outlined in the chart below. Identify compaction of subgrade in each area by digging down to a level that will be 12" below finished grade. Use a shovel or "rod penetrometer" driven solely by the your weight, as described in Section 3, and illustrated in Section 6 "Field Guide to Verifying Soil Quality and Depth." Areas Assess Conditions Include Information on SMP Native vegetation / ✓ Established native plants. ✓ Identify those areas to be left undisturbed and fenced undisturbed soil to be ✓ Undisturbed topsoil and duff layer. during construction. preserved Topsoil not requiring ✓ Depth of compacted layers less than 12 ✓ Will scarification be needed? What depth of scarification grading, but cleared of inches deep. is required to allow compost incorporation and achieve native vegetation ✓ Presence of organic matter that may make 12 inches uncompacted depth? amendment unnecessary, or allow ✓ Will area be amended with compost or topsoil at "pre - calculation of reduced amendment rate. approved" rate, or custom calculated rate? ✓ If planning to use calculated amendment ✓ Can areas be protected from compaction during rate, sample and test soil as described in construction? Step 4. Areas to be cut during ✓ Quantity of topsoil that can pbe stockpiled ✓ Will scarification be needed? What depth of scarification grading and reapplied. is required to allow compost incorporation and achieve ✓ Depth of any compacted layer less than 12 12 inches uncompacted depth? inches below ultimate finished grade. ✓ Will topsoil be stockpiled during grading and reapplied? ✓ Presence of organic matter in subgrade or Will it require supplemental topsoil or compost to achieve topsoil that may make amendment 8 inches depth at specified organic content? unnecessary, or allow calculation of reduced ✓ Will area be amended with compost or topsoil at "pre - amendment rate. approved" rate, or at custom calculated rate? ✓ If planning to use calculated amendment rate, sample and test soil as described in Step 4. Areas to be filled during ✓ Estimate what subgrade conditions will be ✓ What depth of scarification is required to allow compost grading when fill is in place. incorporation and achieve 12 inches uncompacted depth? ✓ Depth of any compacted layer less than 12 ✓ Will area be amended with compost or topsoil at "pre - inches below ultimate finished grade. approved" rate, or custom calculated rate? ✓ Presence of organic matter in fill soil that may make amendment unnecessary, or allow calculation of reduced amendment rate. ✓ If planning to use calculated amendment rate, sample and test soil as described in Step 4. 10 Developing a Soil Management Plan — SECTION FIVE Step 3: Select Amendment Options. The most convenient and economic method for achieving the Soil Quality and Depth guidelines depends on: site soil conditions, grading, and resulting subgrade compaction; the practicality of stockpiling topsoil during grading; and site access issues. "Pre -Approved" or custom calculated rates? Use of "Pre -Approved" amendment rates may simplify planning, however custom calculated rates can save substantial effort and expense —easily repaying the expense of testing and calculations. (See testing required for custom rates at right and on next page, and calculation method in Section 7 "Resources".) Often pasture or woodland soils have adequate organic matter if existing organic layers are preserved. Also, compost products will frequently provide the desired soil organic matter content at lower applications than the Pre - Approved rates (which are based on "average" conditions). Identifying Options on the Site Plan and SNIP form • Identify the areas where each amendment option will be applied by outlining each area on the site plan with a dark, thick -line pen. • Assign each area an identifying number or letter (A, B, C... ) on the plan, and on the Soil Management Plan form. Step 4: Identify Compost, Topsoils and Other Organic Materials for Amendment and Mulch. Amendments for Pre -Approved rates must be compost meeting the definition for "Composted Materials" in WAC 173-350, section 220, (available online at www.ecy.wa.2oy/programs/swfa/organics/soil.htrnl ) or topsoil manufactured from these composts plus clean sand or sandy loam soil. Products must be identified on the Soil Management Plan form, and recent product test results must be provided showing that they meet the additional requirements in this Guide for organic matter content and carbon to nitrogen ratio (see specification in Section 3). For Custom Calculated amendment rates (see right, next page, and formula in Section 7 "Resources"), organic matter may be provided by: • Compost (as defined above), or • Other by organic materials with a carbon to nitrogen ratio under 25:1 (35:1 for native plantings), meeting the same contaminant standards as "Composted Materials" in WAC 173-350, section 220. These products must be identified on the Soil Management Plan form, and recent test results provided showing that they meet these requirements. Step 5: Calculate Amendment, Topsoil and Mulch Volumes on SMP form • For Pre -Approved amendment rates, figure the square footage of each area and complete the simple calculation to convert inches of amendment into cubic yards. • To compute custom calculated amendment rates, use soil and amendment test results and the Model Amendment Rate Calculator Spreadsheet and/or the Equation for Calculating Compost Application Rates (both are in Section 7 "Resources") to achieve the target Soil Organic Matter content (10% SOM for landscape beds, or 5% SOM for turf areas). Site Assessment Supplies • Copy of site grading plan • Sturdy shovel • Tape measure If using custom calculated amendment rates requiring soil tests: • Clean bucket or stainless steel bowl for mixing soil samples • Sealable bags for soil samples, and indelible ink pen to label Sampling and Testing for Custom Calculated Amendment Rates Soil and amendments submitted for testing should be a composite of samples taken from several spots on a site or in a pile of amendment. Soil: Gather samples from soil that will be the subgrade after all grading operations are completed, before placement of imported topsoil or amendments. • Take samples from 10-12 spots in each area. Imagine a line dividing the area in half lengthwise, then divide each half into five near equal sized widths. Take samples near the middle of each subsection. • At each sampling spot dig a spades -width hole at least 8 inches deep, then shave a 1 inch slice from the side of the hole to use in the composite sample. • Thoroughly mix the 10-12 samples from each turf or planting area together in a clean plastic bucket or bowl. Place 2 cups of the mix into a sealable plastic bag for testing (some tests may require more soil, ask laboratories). • Label the bag with the site information, area of sample; plus your name, address and phone number. Amendment: Producers of composts and manufactured topsoils can usually provide test results for their products. If tests are 11 Developing a Soil Management Plan — SECTION FIVE nonexistent or incomplete, conduct necessary tests on each proposed amendment. • Take samples from 10-12 spots in pile of material. Imagine a line dividing the pile in half lengthwise, then gather samples from five spots equally spaced along the length of each side of the pile. • At each sampling spot, dig a spades -width hole at least 8 inches deep. Use a clean cup or trowel to collect a cup of amendment from the bottom of each hole. • Thoroughly mix the 10-12 samples from each pile together in a clean plastic bucket or bowl. Place 2 cups of the mix into a sealable plastic bag for testing (some tests may require more compost, ask laboratories). • Label the bag with the product and supplier information; plus your name, address and phone number. Tests to Conduct for Custom Calculated Amendment Rates: Soil Compost Amendment - Bulk Density - Bulk Density - Percent Organic - Percent Organic Matter Matter (by "loss on ignition" method) (by "loss on ignition" method) - Moisture Content as is - Carbon to Nitrogen Ratio (C:N) - Heavy Metals Analysis (per WAC 173-350, section 220) 12 Developing a Soil Management Plan — SECTION FIVE Model SOIL MANAGEMENT PLAN for BMP T5.13 (available as MS Word file at www.SoilsforSalmon.org) PR03ECT INFORMATION Page # of pages Comnlete all information on Dage 1: only site address and permit number on additional Danes. Site Address / Lot No.: 21022 74th Ave W, Edmonds Wa, 98026 Permit T e:SINGLE FAMILY DUPLEX Permit Number: Permit Holder: David Harris Phone: 206-546-5392 Mailing Address: 19702 20th Ave NW, Shoreline Wa, 98177 Contact Person: David Harris Phone: 206-546-5392 Plan Prepared By: Western Engineers ATTACHMENTS REQUIRED (Check off required items that are attached to this plan) x 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 # 1 (should match Area # on Site Plan) PLANTING TYPE x Turf Undisturbed native vegetation Planting Beds Other: SQUARE FOOTAGE OF THIS AREA: square feet SCARIFICATION inches (depth) of scarification needed to achieve finished total 12" loosened depth. Subsoil will be scarified PRE -APPROVED 1.754ches of compost or imported topsoil applied AMENDMENT METHOD: X 3.1 (conversion factor, inches to cubic yards) PRODUCT: Compost Topsoil imports 425= cu. yards per 1,000 sq. ft. x Amend with compost X3.84,000s sq.ft. in this area Stockpile and amend 20.8 = cubic yards of amendment — — — —> — QUANTITY: 21 CU. YDS. ( cu. yds. stockpiled) (needed to cover this area to designated depth) CUSTOM AMENDMENT Attach test results and calculations. Topsoil import inches organic matter or topsoil import PRODUCT: Topsoil & compost lift X 3_1 Amend = cu. yards / 1,000 sq. ft. Stockpile and amend X ,000s sq.ft. in this area cu. yds. stockpiled) = cubic yards of amendment — — — — — QUANTITY: CU. YDS. MULCH ,000 sq.ft. PRODUCT: X 6.2 (conversion, to give 2 inch mulch depth) = cubic yards of mulch — — — — — — QUANTITY: CU. YDS. 111 CAL A1VIN:INUIVILIN I / I VYJVIL/1V1U LUH t VK ALL ARLAN (complete on page l only, totaling all areas/pages in tnrs t-lan) ❑ Product #1: ❑ Quantity: cu. yds. ❑ Test Results: % organic matter C:N ratio <25:1 (except mulch, or <35:1 for nativeplants) "stable" (es/no) ❑ Product #2: ❑ Quantity: cu. yds. ❑ Test Results: % organic matter C:N ratio <25:1 (except mulch, or <35:1 for nativeplants) "stable" es/no) ❑ Product #3: ❑ Quantity: cu. yds. ❑ Test Results: % organic matter C:N ratio <25:1 (except mulch, or <35:1 for nativeplants) "stable" es/no) Date: Inspector: Approved: Revisions Required: Date: Inspector: Approved: Revisions Required: COMMENTS: 13 FIELD GUIDE TO VERIFYING SOIL QUALITY AND DEPTH IN NEW LANDSCAPES This guide is provided to help professional inspectors verify implementation of soil improvements to fulfill BMP T5.13 "Post Construction Soil Quality and Depth" in the Washington Department of Ecology's Stormwater Management Manual Western Washington. The main conditions to be confirmed are: 1. Provision of eight inches of topsoil containing 10% organic matter in planting beds, or 5% in turf areas. 2. Scarification of compacted subsoil four inches below the topsoil layer (for a total uncompacted depth of 12 inches). 3. Placement of two inches of mulch on all planting beds. Site Inspection Supplies • A copy of the approved Soil Management Plan (SMP) for the site, with site drawing. • A sturdy shovel • Tape measure or 12" ruler • 3/8 inch diameter 3-4 foot stainless steel "rod penetrometer" with a 1/8" bevel cut into the tip at 30 degrees from the side, and a 90 degree bend at top to form a handle (see illustration, next page). • Field Verification Form to record results The following steps may be completed at multiple visits as a project progresses or in one final project approval inspection, depending on local practices: STEP 1: Compare site conditions with approved Soil Management Plan (SMP). The SMP approved with the site permit describes soil treatments approved for each area. Make sure site conditions match these details in the SMP: • Site location and permit holder. • Turf and planting areas match approved drawings. • Areas to remain as undisturbed native soil and vegetation have been fenced off during construction to prevent soil compaction or damage to plants. STEP 2: Inspect delivery tickets for compost, topsoil and mulches. Permitee must provide original delivery tickets for all soil and mulch products. Compare delivery tickets with the SMP to match the following information: • Delivery location. • Total quantities for each soil product and mulch. • Product descriptions and sources. If materials other than those listed in the SMP were delivered, laboratory test results must be provided to confirm that they are equivalent to approved products. STEP 3: Verify depth of amended soil and scarification. Use a shovel to dig at least one test hole per acre for turf and one per acre for planting beds to verify eight inch topsoil depth (below mulch layer), incorporation of amendments, and four inches of uncompacted subsoil. MULCH LOOSE SOIL _� • • with visible dark organic matter LOOSE OR FRACTURED SUBSOIL 0 Test holes should be about one foot deep (after first scraping away any mulch) and about one foot square. Eight Inch Depth of Amended Soil. The top eight inches of soil should be easy to dig using a garden spade driven solely by your weight. The soil should be darker than the unamended soil below, and particles of added organic 14 Verifying Soil Quality and Depth — SECTION SIX matter are likely to be visible. Clay soil that been saturated and then dried may require jumping on the shovel step to penetrate, but the soil should yield easily when moist. Soil that requires vigorous chipping with the shovel to penetrate probably does not meet the specification. Four Inch Depth of Scarified Subsoil. The next four -inch depth of soil should be loose enough to penetrate with the shovel. It may be rocky, and the loosened depth may vary due to the pattern of scarifying equipment — but some sections of subsoil in a one foot square hole should be loose four inches deep into the subsoil (that is, to a total 12 inch depth from the soil surface). STEP 4: Check soil depth in several spots. Use a simple "rod penetrometer" (illustration below) to confirm that the soil is uncompacted twelve inches deep at ten locations per acre — with a minimum of ten on smaller sites. To locate test spots, imagine a line dividing the site (or each acre) in half lengthwise, then divide each half into five nearly equal sections. Conduct tests near the middle of each section. Additional test locations are encouraged. The rod penetrometer should enter the soil twelve inches deep, driven solely by the inspector's weight. Irregular scarification or rocks in the lower layer may require probing a few spots at each location to reach the full depth. A rod penetrometer is a 4 foot long, 3/8 inch or 10 mm diameter stainless steel rod with a 90 degree bend 5 inches form the top to make a handle, and a 30 degree bevel cut 1/8 inch or 3 mm into the side of the tip. STEP 5: Check mulch depth. Use a shovel to scrape away and reveal surface mulch thickness. A two inch layer of organic material (mulch) such as composted sawdust, wood chips, or ground bark should be distinguished from the underlying soil on all planting beds. FINAL STEP: Record results on "Field Verification Form" or similar document (see sample form on next page). What should be attached to the Soil Management Plan? • Scale drawings showing layout of turf and planting beds, and identifying where soil treatments described in the SMP will be applied. • Copies of compost and topsoil test results demonstrating that products contain adequate organic matter, and meet carbon to nitrogen ratio and stability standards. Where custom calculated amendment rates are used, include laboratory analyses of the soil and organic matter sources plus calculations by a qualified professional showing that the organic matter requirement will be achieved. What If A Site Does Not Meet the Soil Management Plan Requirements? If inspection indicates that an installation does not fulfill the approved SMP, the permit holder or their agent should be notified of what steps are needed to comply. When results are unclear or disputed, an independent consultant should conduct sampling for analytical testing of organic matter as described in the project specifications. Qualified consultants include: Certified Soil Scientists, Crop Advisors or Agronomists; or Licensed Landscape Architects, Civil Engineers or Geologists. 15 Verifying Soil Quality and Depth — SECTION SIX Model FIELD VERIFICATION FORM for BMP T5.13 (available as MS Word file at www.SoilsforSalmon. org) PROJECT INFORMATION Page # of pages Complete all information on page 1, only site address and permit number on additional pages. Site Address: Permit Type: Permit Number: Permit Holder: Phone: Mailing Address: Customer Representative At Inspection: Phone: Plan Prepared By: VISIT RECORD Date: Inspector: Items Approved: _ Fencing off undisturbed areas _ Soil preparation Mulch Other: Date: Inspector: Items Approved: _ Fencing off undisturbed areas _Soil preparation Mulch Other: Date: Inspector: Items Approved: _ Fencing off undisturbed areas _ Soil preparation Mulch Other: DELIVERY TICKETS FOR AMENDMENT, TOPSOIL & MULCH. (Check if tickets match Soil Management Plan (SMP). Total volumes. for all areas should be on page I of the SMP). ❑ Product #1: Comments: ❑ Test Results: _ % organic matter C:N ratio <25:1 "stable" (Y/N) ❑ Quantity: cu. yds. (except mulch, or <35:1 for nativeplants) ❑ Product #2: ❑ Test Results: _ % organic matter C:N ratio <25:1 "stable" (Y/N) ❑ Quantity: cu. yds. (except mulch, or <35:1 for nativeplants) ❑ Product #3: ❑ Test Results: % organic matter C:N ratio <25:1 "stable" (Y/N) ❑ Quantity: cu. yds. (except mulch, or <35:1 for nativeplants) AREA # re er to Areas apped on Site Plan and described on Soil Management Plan PLANTING TYPE Test Holes Rod Test Undisturbed vegetation Number Test Holes Required: (minimum 1 hole/acre) Number Rod Tests Required: _ Turf Soil Amended 8 Inches Deep? Y / N (minimum 10 tests/acre) Planting Beds Amendment Matches Soil Mgmt. Plan? Y / N Other: ❑ Topsoil Product ? Rod penetrates 12 inches ❑ Amendment Visible ? deep in all areas? Y / N Square footage: Subsoil Loose/Scarified 12 Inches Deep? Y / N (If Planting Bed, Mulch is Required After Planting) Comments: Mulch Product: Mulch two inches deep? Y / N AREA # PLANTING TYPE Test Holes Rod Test Undisturbed vegetation Number Test Holes Required: (minimum 1 hole/acre) Number Rod Tests Required: Turf Soil Amended 8 Inches Deep? Y / N (minimum 10 tests/acre) Planting Beds Amendment Matches Soil Mgmt. Plan? Y / N Other: ❑ Topsoil Product ? Rod penetrates 12 inches ❑ Amendment Visible ? deep in all areas? Y / N Square footage: Subsoil Loose/Scarified 12 Inches Deep? Y / N (If Planting Bed, Mulch is Required After Planting) Comments: Mulch Product: Mulch two inches deep? Y / N Add additional sheets for additional Areas 16 17 Resources — SECTION SEVEN CALCULATING CUSTOM AMENDMENT RATES TO ACHIEVE A TARGET SOIL ORGANIC MATTER CONTENT Where soils already have some organic content, it is often cost-effective to calculate the amount of compost amendment needed to achieve the target 10% soil organic matter for landscape beds or 5% for turf areas, rather than using the pre -approved rates (see Section Five). Custom amendment rates can be calculated using either the Equation below, or the Model Spreadsheet on facing page (also available as an Excel spreadsheet online at www.SoilsforSalmon.org ). !EQUATION FOR CALCULATING COMPOST APPLICATION RATES: Use this equation to calculate compost application rates to achieve a target final soil organic matter content (FOM, which should be 10% for landscape beds or 5% for turf areas) for a soil with a given bulk density (SBD) and initial soil organic matter (SOM). The spreadsheet example on the next page illustrates how the equation is applied on typical soils using common composted materials. OR = D x SBD x (SOM% - FOM%) SBD x (SOM% - FOM%) - CBD x (COM% - FOM%) Where: CR = Compost application rate (inches) calculated to achieve the target final organic matter (FOM) D = Depth of finished incorporation (inches) SBD = Soil bulk density (lb/cubic yard dry weight)* SOM % = Initial soil organic matter(%)*** FOM% = Final target soil organic matter(%)*** CBD = Compost bulk density (lb/cubic yard dry weight)** COM% = Compost organic matter (%)*** Assumption: This equation calculates compost rate using an additive approach. For example, a 3-inch compost rate incorporated to an 8-inch depth will be a final mix containing 3/8 compost and 5/8 soil by volume. * SBD To convert Soil Bulk Density in g/cm3 units to lb/cubic yard, multiply by 1697. **CBD To convert Compost Bulk Density from lb/cubic yard "as is" to lb/cubic yard dry weight, multiply by solids content. ***OM All Organic Matter measurements are based on the commonly used "loss -on -combustion" method. 18 Resources — SECTION SEVEN MODELAMENDMENT RATE CALCULATOR SPREADSHEET WITH EXAMPLES Example from an Excel spreadsheet that uses the equation on previous page. This Excel file can be downloaded at www.SoilsforSalmon.org This set of examples shows amendment rates in a typical sandy soil using a compost with a bulk density of 6601b/cubic yard, compared with rates for a typical clay soil using compost with a BD of 5501b/cubic yard. It demonstrates that soils with a higher initial organic matter (SOM) require less compost amendment to achieve a desired target final organic matter (FOM — which is set at 10%, appropriate for landscape beds, in these examples). SBD SOM% FOM% CBD COM% D CR Soil bulk Soil Final Compost bulk Compost Depth of Calculated density organic organic density organic incorpor- compost (lb/cubic yard matter matter (lb/cubic yard matter ation application dry weight) (percent) (percent) dry weight) (percent) (inches) rate (inches) Sandy Soil 2206 1% 10% 660 60% 8 inches 3.0 inches Soil bulk 2206 2% 10% 660 60% 8 inches 2.8 inches density = 1.3 g/cm3 2206 3% 10% 660 60% 8 inches 2.6 inches or 2206 Ib/cu yd 2206 4% 10% 660 60% 8 inches 2.3 inches 2206 5% 10% 660 60% 8 inches 2.0 inches 2206 6% 10% 660 60% 8 inches 1.7 inches 2206 7% 10% 660 60% 8 inches 1.3 inches 2206 8% 10% 660 60% 8 inches 0.9 inches Clay Soil 1697 1% 10% 550 50% 8 inches 3.3 inches Soil bulk 1697 2% 10% 550 50% 8 inches 3.1 inches density = 1.0 g/cm3 1697 3% 10% 550 50% 8 inches 2.8 inches or 1697 Ib/cu yd 1697 4% 10% 550 50% 8 inches 2.5 nches 1697 5% 10% 550 50% 8 inches 2.2 inches 1697 6% 10% 550 50% 8 inches 1.9 inches 1697 7% 10% 550 50% 8 inches 1.5 inches 1697 8% 10% 550 50% 8 inches 1.1 inches 19 Resources — SECTION SEVEN PERMITTED COMPOSTING FACILITIES IN WASHINGTON HAT SELL BULK COMPOST Compost from many of these facilities is sold and mixed into topsoil products through numerous retail outlets — check with topsoil and nursery vendors too. Please note that some of these facilities are not open to the general public. Information from the WA Department of Ecology website, current 2011. Note: not updated for this 2016 print edition — see website below for a current list of suppliers. An annually updated list of Permitted Composting Facilities throughout Washington is available at the DOE website www.ecy.wa.goy/programs/swfa/organics/soil.html County Facility / Company rCity Phone Benton City of Richland Horn Rapids Composting Operation Richland 509-942-7481 Chelan Chelan County Compost Facility Dryden (509) 548-5592 Stemilt World Famous Compost Facility Wenatchee 509-662-3613 Clallam City of Port Angeles Municipal Landfill Facility Port Angeles (360) 417-4874 Clark H & H Wood Recyclers Vancouver (360) 892-2805 Columbia Columbia Compost Dayton (509) 386-4748 Cowlitz Cowlitz County Landfill Longview (360) 577-3125 Grant Quincy Compost Quincy (509) 787-3523 Royal Organic Products Royal City (509) 554-3885 Island Mailliard's Landing Nursery Oak Harbor (360) 679 8554 Jefferson Port Townsend Biosolids Compost Facility Port Townsend (360) 385-7908 King Cedar Grove Composting Co. Maple Valley Seattle 1-877-764-5748 or (425) 432-2395 GroCo/ Steerco/ Sawdust Supply Kent (206) 622-5141 Woodland Park Zoo Seattle (206) 548-3633 Kitsap Emu Composting Facility Kingston 360-638-0117 County Facility / Company City Phone Kittitas County Compost Facility Ellensburg 509-962-7542 Lincoln Barr -Tech Composting Facility Sprague 509-590-0437 Mason North Mason Fiber Co. Belfair (360) 275-0228 Pierce LRI compost Factory, Pierce County Recycling, Composting & Disposal Puyallup (253) 847-7555 Pierce County Purdy Compost Facility Gig Harbor (253) 857-2075 Skagit Dykstra Composting Facility Burlington (360) 767-6376 Skagit Soils Inc Mount Vernon (360) 424-0199 Snohomish Bailand Farms Yardwaste (Bailey) Compost Snohomish (360) 568-8826 Cedar Grove Composting Co. Everett (425) 212-2515 Lenz Enterprises Inc. (GreenBlenz Compost) Stanwood (360) 629-2933 Pacific Topsoils - Maltby Woodinville 1-800-884-7645 or (425) 337-2700 Riverside Topsoil Inc. Snohomish (425) 379-9933 Thurston Silver Springs Organics Composting LLC Tenino (360) 446-7645 Walla Walla Boise Wallula Composting Wallula (509) 545-3318 Sudbury Landfill Compost Facility Walla Walla 509-527-4591 WSP Correctional Industries Compost Facility Walla Walla 509-526-6361 Whatcom Green Earth Technology (Compost) Lynden (360) 354-4936 Yakima Natural Selection Farms Composting Facility Sunnyside (509) 837-3501 Soil and Compost Analytical Laboratories Serving the Northwest Resources — SECTION SEVEN NUTRIENT MANAGEMENT EM 8677 Revised May 2008 laboratories Sr:rving Orr:gon Soil, WatEr, Plant TissuE, and FEEd Analysis .I. Hart Soil testing and plant analysis aid commercial growers, gardeners, and homeowners in making decisions about fertilizing or applying soil amendments. This fertilizer guide lists a variety of laboratories serving Oregon, and provides specific information about laboratory services. To compile this list, the OSU Extension Service requested information from labs providing services for Oregon and adjacent areas. OSU Extension Service makes no endorse- ment by listing a laboratory; conversely, omission of a labora- tory does not indicate that it's unsuitable. Another source for locating commercial laboratories is the yellow pages of your local telephone directory. Before submitting material to a lab, pay attention to the following guidelines: • Be sure the test you request is the right one to answer your question. Nutrients aren't the only factor for successful crop production, so a soil test may not tell you why your plants don't grow. Ask a county Extension agent or other agriculture professional which tests you may need. • The goal of a soil or tissue test is a fertilizer recommenda- tion. Fertilizer recommendations are based on soil/tissue tests that follow a set procedure or recipe. For example, OSU fertilizer recommendations are based on procedures used in OSU's Central Analytical Laboratory. Many labs say they use "comparable" procedures, but they may not. A laboratory that uses a procedure different from OSU's most likely will give a different fertilizer recommendation. • Before sending samples, call the lab to inquire about costs and shipping instructions. For example, soil samples to be tested for nitrate -nitrogen should be refrigerated or dried rather than sent moist at room temperature. • Beware of low prices. Laboratory procedures cost money to perfonn. A lab quoting a low price usually analyzes a few elements and estimates the others. You do not want estimates —make sure you obtain results from analytical work. • For information on taking soil samples, see EC 628, Soil Sampling for Home Gardens and Small Acreages. This list is revised regularly. Laboratories wishing to be added to this list may contact: John Hart, Extension soil science specialist Department of Crop and Soil Science Ag & Life Sciences Building 3017 Oregon State University Corvallis, OR 97331-7306 541-737-5712 For a list of laboratories approved by the Oregon Health Division for drinking water analysis, contact the Oregon Health Division, Drinking Water Systems, P.O. Box 14450, Portland, OR 97214-0450, or call 503-731-4010 or 503-731-4009. For additional copies of this publication, visit your local county office of the OSU Extension Service, or contact: Publication Orders Extension & Station Communications Oregon State University 422 Kerr Administration Corvallis, OR 97331-2119 Fax:541-737-0817 This publication also is available on the OSU Extension Service website (extension.oregonstate.edu/catalog/). Choose Agriculture, followed by Soil and Water (or search within the catalog by the series number, EM 8677). John Hart, Extension soil scientist, Oregon State University. This publication replaces FG 74, A List of Analytical Laboratories Serving Oregon. 0SUCc 2008 Oregon State University This publication was produced and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914. Extension work is a cooperative program of Oregon State University, the U.S. Department ofAgiiculture, and Oregon counties. Oregon State University Extension Service offers educational programs, activities, and materials without discrimination based on age, color, disability, gender Oregon State identity or expression, marital status, national origin, race, religion, sex, sexual orientation, or veteran's status. Oregon State University UNIVERSITY Extension Service is an Equal Opportunity Employer, Extension Service Revised June 2006. Revised May 2008 22 Soil and Compost Analytical Laboratories Serving the Northwest Resources — SECTION SEVEN Analytical Laboratories Serving Oregon Analyses EM 8677 • page 2 • Revised May 2008 Area Plant Other Served Soil Water Tissue Feed Services � U c � 3 o w c E Laborator w A tic L Western Agricultural Laboratories ....... • • • • • • • • • • • • • 1311 Woodland Ave., Suite 1 Modesto, CA95351-4732 209-529-4080 • FAX 209-529-4736 Portland Office 10220 SW Nimbus Ave., Bldg. K-9 Portland, OR 97223 503-968-9225 • FAX 503-598-7702 e-mail: rbutterf(dal-labs-west.com Web: a]-labs-west.com Agri -Check, Inc ................................................... • • • • • • • • • 323 Sixth St. • P.O. Box 1350 Umatilla, OR 97882 541-922-4894 or800-537-1129 FAX: 541-922-5496 e-mail: dara@agri-chcck.com Alexin Analytical Laboratories .......................... • • • • • 13035 SW Pacific Hwy., Portland, OR 97223 503-639-9311 • FAX 503-684-1588 e-mail: mail@alexinlabs.com Web: www.alexiniabs.com Analytical Laboratory and Consultants, Inc.... • SC • 7l_ • Is • • 361 W Fifth Ave., Eugene, OR 97401 541-485-8404 or800-262-5973 FAX 541-484-5995 e-mail: anlabinc@rio.com Basin Agri -Serve .................................................. • • • • • • 22109 Stateline Rd., P.O. Box R Merrill, OR 97633 541-798-5112 • FAX 541-798-51 l4 e-mail: basinagri@fireserve.net Best -Test Analytical Services ............................... • • • • • • • • 3394 Bell Rd. NE, Moses Lake, WA 98837 509-766-7701 • FAX 509-766-7705 e-mail: besttest(aatnet.net Bodycote FPL, Inc... ............................................ • • • • • • • • • 12003 NE Ainsworth Circle, Portland, OR 97220 503-253-9136 or800-375-9555 FAX 503-253-9019 e-mail: fpltim@aol.com Web: www.fplabs.com Brookside Laboratories, Inc .............................. • • • • • • • • • • • • 308 S Main St., New Knoxville, OH 45871 419-753-2448 • FAX 419-753-2949 e-mail: mflock@blinc.com Web: www.blinc.com Cascade Analytical, Inc ...................................... • • • • • • • • • • 3019 G.S. Center Rd., Wenatchee, WA 98801 509-662-1888 e-mail: cascade@nwi.net Web: www.cascadeanalytical.com *SC indicates a service is subcontracted. 23 Soil and Compost Analytical Laboratories Serving the Northwest Resources — SECTION SEVEN Analytical Laboratories Serving Oregon EM 8677 • page 3 • Revised May 2008 Area Served Analyses Plant Soil Water Tissue Feed Other Services � � 3 U W C4 C O Laboratoryb o 3 ¢ w� whoa ° o - L:: f R o 3 Dairy One Forage Lab ........................................ • • • • 730 Warren Rd., Ithaca, NY 14850 607-257-1272 • FAX 607-257-1350 e-mail: forage@dairyone.com Web: www.dairyone.com Dellavalle Laboratory, Inc .................................. • • • • • • • • • • • 1910 W McKinley, Suite 110 Fresno, CA 93728-1298 559-233-6129 • FAX 559-268-8174 e-mail: ndellavalle@dellavallelab.com Web: www.dellavallelab.com Delta Environmental Services, Inc ..................... • • • • • • • 36 Irving Rd., Eugene, OR 97404 541-689-3177• FAX 541-689-5104 e-mail: contact(odeltaesi.com Web: www.deltaesi.com Kuo Testing Laboratories, Inc ........................... • • • • • • • • • • • • 337 S First Ave., Othello, WA 99344 509488-0112 • FAX 509488-0118 e-mail: kuotest@atnet.net Web: www.kuotesting.com Laucks Testing Laboratory ................................ • • • • • • • • • • 940 S. Harney St., Seattle, WA 98108 206-767-5060 • FAX 206-767-5063 MDS Harris.......................................................... • • • • • • 621 Rose St., P.O. Box 80837 Lincoln, NE 68501 402-476-2811 • FAX 402-476-7598 e-mail: steve.frack@mdsinc.com Web: www.mdsharris.com Northwest Agricultural Consultants ................. • • • • • • • • • 2545 W Falls, Kennewick, WA 99336 509-783-7450• FAX 509-783-5305 e-mail: bob@nwag.com Web: www.nwag.com OMIC USA, Inc ................................................... • • • • • • • • • • • 3344 NW Industrial St., Portland, OR 97210 503-223-1497• FAX 503-223-9436 e-mail: labmgr@omicusa.com Web: www.omicnet.com Oregon State University Central Analytical Laboratory .......................... • • • Ag & Life Sciences Bldg., Room 3079 Corvallis, OR 97331-7306 541-737-2187• FAX 541-737-5725 Pacific Agricultural Laboratory ........................ • • • • • • • • 12505 NW Cornell Rd., Portland, OR 97229 503-626-7943 • FAX 503-641-0644 e-mail: sthun@pacaglab.com Web: www.pacagiab.com Pacific Analytical Laboratory, Inc ..................... • • • • • • • 540 SW Third, Corvallis, OR 97333 541-753-4946• FAX 541-753-4994 e-mail: info@pacificanalytical.com 24 Soil and Compost Analytical Laboratories Serving the Northwest Resources — SECTION SEVEN Analytical Laboratories Serving Oregon Analyses EM 8677 • page 4 • Revised May 2008 Area Plant Other Served Soil Water Tissue Feed Services � � U � 3 E p ^ A o Laboratory g 3 t, : w 5 ao ' a a w v Soil & Plant Laboratory, Inc .............................. • • • • • • • • • • • • • • 13547 SE 27th Pl. Suite 3B, Bellevue, WA 98005 425-746-6665 • FAX 425-562-9531 e-mail: splabnw@flash.net Web: www.soilandplantlaboratory.com Oregon Office 503-557-4959•FAX 503-557-0713 e-mail: splabor@flash.net Soiltest Farm Consultants, Inc ........................... • • • • • • • • • • 2925 Driggs Dr., Moses Lake, WA 98837 509-765-1622 • FAX 509-765-0314 e-mail: brent`ctsoiltestlab.com Web: www.soiltestiab.com Specialty Analytical ............................................. • • • • • • • • 19761 SW 95th Ave., Tualatin, OR 97062 503-612-9007 • FAX 503-612-8572 e-mail: marty@specialtyanalytical.com Web: www.specialtyanalytical.com Stukenholtz Laboratory, Inc .............................. • • • • • • • • • • 2924 Addison Ave. E, P.O. Box 353 Twin Falls, ID 83303-0353 208-734-3050, 800-759-3050 • FAX 208-734-3919 e-mail: stuklab@mindspring.com Web: www.stukenholtz.com Test America........................................................ • • • • • • • • • • 9405 SW Nimbus Ave., Beaverton, OR 97008 503-906-9200 • FAX 503-906-9210 Umpqua Research Company ............................. • • • • • • • • P.O. Box 609,626 NE Division Myrtle Creek, OR 97457 541-863-5201•FAX 541-863-6199 e-mail: lab@uTcmail.net Web: www.chemlab.cc USAg Analytical Services, Inc ............................ • • • • • • • • • 1320 E Spokane St., Pasco, WA 99301 509-547-3838 • FAX 509-547-8645; certified NFTA Utah State University Analytical Lab • • • • • • • • • • 4830 Old Main Hill, 166 Ag Science Bldg. Logan, UT 84322-4830 435-797-2217 • FAX 435-797-2117 Web: www.usual.usu.edu • e-mail: usual@usu.edu Waterlab Corp ..................................................... • • • 2603 12th St. SE Salem, OR 97302 503-363-0473• FAX 503-363-8900 Western Laboratories, Inc .................................. • • • • • • • • • • • • • P.O. Box 1020, Parma, ID 83660 208-722-6564,800-658-3858•FAX 208-722-6550 e-mail: john@westernlaboratories.com Web: westernlaboratories.com William F. Black Soil Testing ............................. • • • • • • • • 503 Gardner, P.O. Box 317, Burlington, WA 98233 360-757-6112 • e-mail: bjlblack@verizon.net 25 Resources — SECTION SEVEN ADDITIONAL RESOURCES ON COMPOST QUALITY & USE, AND THE ROLE OF SOIL QUALITY IN STORMWATER MANAGEMENT Background Science University of Washington Center for Water and Watershed Studies hlWs:Hdi,aital.lib.washin tog n.edu Search publications database for: • Proceedings of 1998 Salmon in the City conference — reports on a number of studies by University of WA and other scientists, includes source references for stormwater & water quality data presented in this Guide • The Relationship Between Soil and Water: How Soil Amendments and Compost Can Aid in Salmon Recovery, a 1999 report by King and Snohomish Counties, City of Seattle, Washington Dept. of Ecology, and Washington State University • Guidelines for Landscaping with Compost -Amended Soils, a 1998 report prepared for the City of Redmond which details trials, stormwater benefits, and 3-7 paybacks on compost amendment based on landscape water savings This site also includes research on the effects of urbanization, stream restoration techniques, permeable paving , etc. Soil Biology and Soil Functions: Why Soil Life Matters, and How it Works US Dept. of Agriculture, NRCS Soil Quality Institute http://soils.usda.,gov/sqi/ Download the excellent Soil Biology Primer at http://www.nres.usda..ov/wps/portal/nres/main/soils/health/biology_/ and other soil quality and erosion prevention resources, or order print copies from 1-800-THE SOIL Washington State University's Soil Management research site http://puyallup.wsu.edu/soils/ Of particular interest are the sections on Compost, Current Research, and Soils and Soil Testing Soil Restoration, Compost Quality and Compost Use Washington Organic Recycling Council www.compostwashin tg on.org and Soils for Salmon www.SoilsforSalmon.org Background and up to date information on Soils for Salmon initiative, this Building Soil guide online including calculations spreadsheet, and useful links on compost use and soil restoration. A new (2008) partner site, www.BuildingSoil.org carries this Building Soil guide too, along with factsheets on construction sequencing, erosion control, and customer information. Washington State Department of Ecology's Solid Waste/Compost Program www.ecy.wa.izoy/programs/swfa/orfzanics/soil.html includes links to Washington State's Compost Facility Standards — WAC 173-350 section 220 — referred to in this Guide, as well as a current list of Permitted Composting Facilities, and other useful compost resources U.S. Composting Council hgp:Hcompostingcouncil.org/ The most authoritative source for information on compost specifications. Particularly useful to landscape professionals is the recently updated Field Guide to Compost Use. USCC's "Seal of Testing Assurance" (STA) program is the state-of-the-art for verifying compost quality and specifications for a variety of uses. See hltp:HcoMpostingeouncil.org/tinecc/ and follow the "STA" link for complete information. Penn State Turfgrass Extension hqp://plantscience.psu.edu/research/centers/turf/extension/factsheets/composts Download Dr. Peter Landschoot's practical guide, Using Composts to Improve Turfgrass Performance Ecologically Sound Lawn Care for the Pacific Northwest Seattle Public Utilities. See sections on soil preparation for turf, and compost use in turf topdressing. www.seattle.gov/util/landscUeprofessionals click on "Lawn" 26 Stormwater Management with Soil and Low Impact Development BMPs Washington State Department of Ecology Stormwater Management Manual for Western Washington, (2001, revised 2005) used by local jurisdictions for stormwater design, contains soil improvement as a Best Management Practice (Volume V, Chapter 5, BMP T5.13) at www.ecy.wa.gov/programs/wq/stormwater/manual.html, and see the Soils for Salmon website below for the online version of this Guide to implementing that BMP. Washington Stormwater Center http://www.wastonnwatcrcentcr.org/ has an array of Low Impact Development stormwater and site planning resources, incorporating soil BMPs, especially the Low Impact Development Technical Guidance Manual for Puget Sound and the Rain Garden Handbook http://www.wastonnwatercenter.or /g lid/ Master Builders Association's "Built Green" sustainable building program, developed with King and Snohomish Counties, includes soil strategies for home building. www.builtareen.net Homeowner resources www.700milliongallons.org Soil and Compost Use Specifications and Design Guidelines WA Dept. of Transportation soil bio-engineering page and Roadside Manual hqp://www.wsdot.wa.gov/Design/Roadside/ and WsDOT's compost specifications in their Standard Specifications Seattle Public Utilities, Green Stormwater Infrastructure codes, specs & projects www.seattle.jzov/util/Greenlnfrastructure and best landscape practices (including soil) information for homeowners at www.seattle.gov/util/services/yard/ and for landscape design, construction, and maintenance professionals at www.seattle.,gov/util/landscgpeprofessionals Low Impact Development Technical Guidance Manual for Puget Sound (see WA Stormwater Center above) Texas DOT specs http://www.txdot.gov/ (search under "compost") Iowa State University research & Iowa DNR specs www.eng.iastate.edu/compost/ A national version of the Washington soil BMP is now included in The Sustainable Sites Initiative: Guidelines and Performance Benchmarks, a LEED-like green building standard for sites, see www.sustainablcsites.org and see Specifications in APWA and CS[format at end of this Guide Compost Berms and Blankets for Erosion Control Compost Berm, Blanket and Sock specifications, approved BMPs for erosion control, on US EPA NPDES menu http://www.epa.goy/npdes (select "stormwater" then "construction") or search "compost blanket" on that site. For an introduction, see the "Erosion Control with Compost" factsheet on www.buildin sog il.org Search the internet for "compost berms" and "compost blankets" for current information. Good online articles include: • BioCycle Journal www.biocycle.net/ Search the index for various articles, especially "Compost Filter Berms and Blankets Take on the Silt Fence" by Rod Tyler, Biocycle: Vol. 42; No. 1, January 2001 • "Erosion Control and Environmental Uses for Compost" by Rod Tyler et al http://www.p2pgys.or,g/ref/l 1/10295.pdf • Various articles in Erosion Control Journal (search under "compost") http:Hforestemetwork.com/magazines/erosion-control/ • "Restoring Soil Health To Urbanized Lands" Oregon DEQ, esp. pp14-19 on compost berm and blanket trials, and p. 26 for specifications hllp://www.deg.state.or.us/lq//ubs/docs/sw/compost/RestorinfzSoilHealth.pdf For More Information Contact: Washington Organic Recycling Council info@compostwashington.org www.compostwashin tg on.org/ and see more resources at www.soilsforsalmon.orand www.buildinEsoil.org Notes W M .6400� � �r r, www "L."P. •� . j'w.4 �. LA 01ONAPONOWALM r Mf, W46.4.r,.Mtr� Mir ..:.•: I LE Model Soil Amendment Specification to implement Soil Quality and Depth BMP T5.13 APWA FORMAT available as an MS Word file at www.SoilsforSalmon.org y *Apo 016+' / W%VAWW " lip e � � w APWA-DOT Format Specification SPECIAL PROVISIONS 9.14.1 Soil (New Section) 9.14.1(1) Work in this Section SECTION 9-14 EROSION CONTROL AND ROADSIDE PLANTING SP-1 A. Section includes: 1. Soil amendments. 2. Soil preparation. 3. Preparation and finish grading of planting and lawn areas. 4. Mulching 9.14.1(2) References A. Washington State Department of Ecology, Western Washington Stormwater Manual, BMP T5.13: Post -Construction Soil Quality and Depth B. WAC Chapter 173-350, Definitions and Section 220 C. United States Department of Agriculture (USDA) Soil Texture System of Classification 9.14.1(3) Submittals A. Soil Management Plan: Prior to commencement of site work, submit a copy of the project Soil Management Plant and an attached implementation schedule that have been approved by local jurisdiction for permit. B. Samples: Submit samples of all soil amendments. Include a list of sources and certification as specified. Soil amendments shall be submitted in one -gallon containers. C. At the time of Post -Construction Inspection, furnish copies of material verifications such as load tickets, invoices, sales slips, test results and similar items as specified. 9.14.1(4) Quality Assurance A. Qualifications of Contractor: The Contractor shall be active and experienced in work of the type specified, and upon request by the Contracting Agency, be able to show evidence of successful completion of projects of similar scope. B. Regulatory Requirements: Obtain and pay for all permits and testing related to the work of this section. C. Pre -Grading Inspection: In conjunction with the soil preparation specified herein, meet with the Contracting Agency to discuss and verify requirements, schedule, and proposed soil preparation methods. 9.14.1(5) Guarantee A. Guarantee: Guarantee materials and workmanship for a period of one-year following Owner's final acceptance. APWA-DOT Format Specification SPECIAL PROVISIONS 9.14.1(6) Sequencing And Scheduling SECTION 9-14 EROSION CONTROL AND ROADSIDE PLANTING SP-2 A. Coordinate work of other trades specified elsewhere. B. Do not perform soil preparation work in areas subject to the subsequent work of other sections, unless approved otherwise. 9.14.1(7) Maintenance A. Maintain the work as specified in this section until final acceptance of the work. 9.14.1(8) Compost A. Composted material must be in compliance with WAC Chapter 173-350 Section 220; plus the following additional requirements. B. Additional Requirements 1. The carbon to nitrogen ratio of the compost shall be below 25:1, or below 35:1 if the proposed plantings are composed entirely of plants native to the Puget Sound Lowlands region. 2. The compost shall have an organic matter content of 35% to 65% as determined by "loss on ignition" test method. C. Alternative organic materials may be used in lieu of the specified compost if they meet the criteria for carbon to nitrogen ratio, contaminants (as defined in WAC Chapter 173-350 Section 220), and when mixed with existing native soil can achieve a calculated organic content of 5% for turf areas or 10% for planting beds. D. Submit one -gallon sample, source, and letter of certification from the supplier to the Contracting Agency for approval prior to installation. 9.14.1(9) Mulch A. Specified compost, or fine ground freshwater bark, or stockpiled forest duff from the project site. B. Submit one -gallon sample, source, and letter of certification from the supplier to the Contracting Agency for approval prior to installation 9.14.1(10) Imported Topsoil A. A mixture of compost, meeting requirements of Section 2.1 above, and sand or sandy loam per USDA soil texture classification. The mixture shall contain a minimum of approximately 5% organic matter for turf areas or a minimum of approximately 10% organic matter for planting beds. The sand or sandy loam shall be free of weeds, deleterious materials, rocks, and debris. 100% of the imported topsoil shall pass through a 3/4" screen, less than 25% shall pass through a #200 sieve. B. Submit one -gallon sample, source, and letter of certification from the supplier to the Contracting Agency for approval prior to installation. APWA-DOT Format Specification SECTION 9-14 SPECIAL PROVISIONS EROSION CONTROL AND ROADSIDE PLANTING SP-3 9.14.1(11) Soil Management Plan A. The Soil management Plan (SMP) will be submitted as part of site development / building permit application, and will include the following: 1. An 11" X 17" or larger site map indicating: Option 1. Areas where native soil and vegetation will be retained in place, Option 2. Areas where topsoil or subsoil will be amended in place, Option 3. Areas that will be stripped and stockpiled prior to grading for reapplication, and Option 4. Areas where imported topsoil will be applied. 2. Calculations for volumes of soil to be stockpiled, and amounts of amendment or topsoil to be imported to achieve specified minimum organic matter content. 3. Names and sources of specified organic amendments and topsoil products to be used, with copies of laboratory analyses documenting that organic matter content and carbon to nitrogen requirements will be achieved and that compost meets WAC Chapter 173-350 Section 220 definition of "Composted Material'. 4. IF CALCULATED AMENDMENT RATES ARE TO BE USED, characterize site soils to be amended and compost or alternative organic material for the following properties: a. Soil- Bulk density, organic matter content and depth of compacted layers to a depth of 12 inches. b. Compost or alternative organic material- Bulk density, organic matter content, carbon to nitrogen ratio, moisture content/percent solids. Soil samples must be gathered following the distribution plan outlined in the Post - Construction Inspection below, and be composed of material from the entire depth to be amended, excluding any surface mulch layers. Calculations by a Qualified Professional must be provided showing that the organic content requirements will be met based on the organic contents and densities of both the site soil and amendments. Qualified Professionals include Certified Soil Scientists, Crop Advisors or Agronomists; and Licensed Landscape Architects, Civil Engineers or Geologists. 9.14.1(12) Preparation A. Protect surrounding construction from damage caused by the work of this section. 9.14.1(13) Subgrades A. Prepare subgrades as specified in paragraph 9.14.1(14) Amendment Options 9.14.1(14) Amendment Options A. Select the soil preparation option which best suits the project site. Different options may be used in different areas of the project. Choose either the "default' pre -approved amendment rate, or a qualified professional may calculate a custom rate based on soil and amendment tests described in Section 9.14.1(11) A.4. The selected soil preparation option(s) shall be shown on the Soil Management Plan approved with site development permit. OPTION 1: Leave Native Vegetation and Soil Undisturbed, and protect from compaction during construction Identify areas of the site that will not be stripped, logged, graded or driven on, and fence those areas to prevent impacts during construction. If not impacted, either in soils or vegetation, these areas do not require amendment. APWA-DOT Format Specification SPECIAL PROVISIONS SECTION 9-14 EROSION CONTROL AND ROADSIDE PLANTING SP-4 OPTION 2: Amend Existing Soil In -Place Scarification: Scarify or till subgrade to 8 inches depth (or to depth needed to achieve a total depth of 12 inches of uncompacted soil after calculated amount of amendment is added). Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. A. Planting Beds B. Turf Areas i. PRE -APPROVED RATE: Place and rototill L PRE -APPROVED RATE: Place and rototill 3 inches of composted material into 5 inches 1.75 inches of composted material into 6.25 of soil (a total amended depth of about 9.5 inches of soil (a total amended depth of about inches, for a settled depth of 8 inches); 9.5 inches, for a settled depth of 8 inches); ii. CALCULATED RATE: Place and rototill ii. CALCULATED RATE: Place and rototill calculated amount of composted material or calculated amount of composted material or approved organic material into depth of soil approved organic material into depth of soil needed to achieve 8 inches of settle soil at needed to achieve 8 inches of settled soil at 10% organic content 5% organic content. Rake beds to smooth and remove surface Water or roll to compact soil to 85% of rocks arcier than 2 inches diameter. maximum. Mulch planting beds with 2 inches of organic Rake to level, and remove surface woody I mulch. debris and rocks larger than 1 inches diameter OPTION 3: Stockpile site topsoils prior to grading for reapplication. Amend with organic matter or add topsoil if necessary to achieve required organic content to 8 inches depth. Scarification: If placed topsoil plus compost or other organic material will amount to less than 12 inches: Scarify or till subgrade to depth needed to achieve 12 inches of loosened soil after topsoil and amendment are placed. Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. A. Planting Beds B. Turf Areas Stockpile and cover soil with weed barrier Stockpile and cover soil with weed barrier material that sheds moisture yet allows air material that sheds moisture yet allows air transmission, in approved location, prior to transmission, in approved location, prior to grading. grading. Replace stockpiled topsoil prior to planting. Replace stockpiled topsoil prior to planting. i. PRE -APPROVED RATE: Place and rototill i. PRE -APPROVED RATE: Place and rototill 3 inches of composted material into 5 inches 1.75 inches of composted material or into 6.25 of replaced soil (a total amended depth of inches of replaced soil (a total amended depth about 9.5 inches, for a settled depth of 8 of about 9.5 inches, for a settled depth of 8 inches); inches); ii. CALCULATED RATE: Place and rototill H. CALCULATED RATE: Place and rototill calculated amount of composted material or calculated amount of composted material or approved organic material into depth of approved organic material into depth of replaced soil needed to achieve 8 inches of replaced soil needed to achieve 8 inches of settled soil at 10% organic content settled soil at 5% organic content. Rake beds to smooth and remove surface Water or roll to compact soil to 85% of rocks lar er than 2 inches diameter. maximum Mulch planting beds with 2 inches of organic Rake to level, and remove surface rocks larger I mulch or stockpiled duff. than 1 inches diameter. APWA-DOT Format Specification SPECIAL PROVISIONS SECTION 9-14 EROSION CONTROL AND ROADSIDE PLANTING SP-5 OPTION 4: Import topsoil meeting organic matter content standards. Scarify or till subgrade in two directions to 6 inches depth. Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. A. Planting Beds: Use imported topsoil mix B. Turf Areas: Use imported topsoil mix containing 10% organic matter (typically containing 5% organic matter (typically around around 40% compost). 25% compost). Place 3 inches of imported topsoil mix on Place 3 inches of imported topsoil mix on surface and till into 2 inches of soil. surface and till into 2 inches of soil. Place 3 inches topsoil mix on surface. Place 3 inches topsoil mix on surface. Rake beds to smooth, and remove surface Water or roll to compact soil to 85% of rocks over 2 inches diameter. maximum. Mulch planting beds with 2 inches of organic Rake to level, and remove surface rocks larger mulch. than 1 inches diameter. 9.14.1(15) Inspection And Verification A. Pre -Grading Inspection: Prior to the commencement of site work, contact the Contracting Agency to provide an inspection to verify the delineation and protection of native soils and vegetation to remain undisturbed, and to verify the proposed location for topsoil and material stockpiling. Make corrections and adjustment as directed by the Inspector. B. Interim Grading Inspection: Prior to the placement of soil amendments, contact the Contracting Agency to provide an inspection to verify that specified erosion control methods have been implemented, the location of stockpiled soil and materials, and that subgrades are consistent with the Soil Management Plan. Make corrections and adjustment as directed by the Inspector. C Post -Installation Inspection: Prior to planting, contact the Contracting Agency to provide an inspection to verify that the placement of amendments and soil preparation is consistent with the Soil Management Plan. Provide delivery tickets for soil amendments to verify the quantity of material specified on the Soil Management Plan. Make corrections and adjustment as directed by the Inspector. D. Mulch Placement Verification: At the completion of planting, contact the Contracting Agency to provide a review to verify that mulch has been installed as specified. E. Secondary Verification for Failing Sites: If the Contracting Agency determines that the installation does not meet the conditions of the approved Soil Management Plan, additional testing by an independent certified soil consultant will be ordered by the Contracting Agency and paid for by the Contractor. Make corrections and adjustment as directed by the Contracting Agency. 9.14.1(16) Final Acceptance A. Final acceptance by the Contracting Agency for soil preparation will be contingent on the approval of all inspections, and that the soil preparation is consistent with these specifications and with the approved Soil Management Plan. APWA-DOT Format Specification SECTION 9-14 SPECIAL PROVISIONS EROSION CONTROL AND ROADSIDE PLANTING SP-6 9.14.1(17) Measurement A. Soil amendments, soil preparation, and mulching will be measured along the ground slope and computed in square yards for the areas completed and accepted by the Contracting Agency. 9.14.1(18) Payment A. Payment will be made in accordance with Section 1.04.1, for each of the following listed bid items that are included in the proposal: Amendment Option One - Planting Beds, per square yard. Amendment Option One - Turf Areas, per square yard. Amendment Option Two - Planting Beds, per square yard. Amendment Option Two - Turf Areas, per square yard. Amendment Option Three - Planting Beds, per square yard. Amendment Option Three - Turf Areas, per square yard. 9.14.4(3) Bark or Wood Chips (DELETE PARAGRAPH) 9.14.4(4) Sawdust (DELETE PARAGRAPH) 9.14.4(8) Compost (DELETE PARAGRAPH) END OF SECTION Notes W M .6400� � �r r, www �,. M LA 01ONAPONOWALM Mf, W46.r .r-+���IMMtrrl Model I LE Soil Amendment Specification to implement Soil Quality and Depth BMP T5.13 CSI FORMAT available as an MS Word file at www.SoilsforSalmon.org _ T f ` + SA. -0-a.0 NOW CSI Format Specification PART 1 - GENERAL 1.1 RELATED DOCUMENTS Section 028 Page 1 TOPSOIL A. Drawings, General Provisions of the Contract and Division-1 Specifications sections, apply to this section. 1.2 WORK IN THIS SECTION A. Section includes: 1. Soil amendments. 2. Soil preparation. 3. Preparation and finish grading of planting and lawn areas. 4. Mulching B. Substitutions. Substitute products will be considered only under the terms and conditions of Section 01640. 1.3 RELATED WORK IN OTHER SECTIONS A. The following Sections contain requirements that may relate to this Section: 1. Section 02200 -Earthwork 2. Section 02810 -Irrigation 3. Section 02900 -Planting 4. Section 02920 - Seeding 1.4 REFERENCES A. Washington Department of Ecology, Western Washington Stormwater Manual, BMP T5.13: Post - Construction Soil Quality and Depth B. WAC Chapter 173-350, Definitions and Section 220 C. United States Department of Agriculture (USDA) Soil Texture System of Classification 1.5 SUBMITTALS A. Make submittals in accordance with Section as applicable B. Soil Management Plan: Prior to commencement of site work, submit an approved copy of the project Soil Management Plant with an attached implementation schedule. C. Samples: Submit samples of all soil amendments. Include a list of sources and certification as specified. Soil amendments shall be submitted in one -gallon containers. D. At the time of Post -Construction Inspection, furnish copies of material verifications such as load tickets, invoices, sales slips, test results and similar items as specified. 38 CSI Format Specification 1.6 QUALITY ASSURANCE Section 028 Page 2 TOPSOIL A. Qualifications of Contractor: The Contractor shall be active and experienced in work of the type specified, and upon request by the Owner and/or Owner's Representative, be able to show evidence of successful completion of projects of similar scope. B. Regulatory Requirements: Obtain and pay for all permits and testing related to the work of this section. C. Pre -Grading Inspection: In conjunction with the soil preparation specified herein, meet with the Owner and/or Owner's Representative to discuss and verify requirements, schedule, and proposed soil preparation methods. 1.7 GUARANTEE A. Guarantee: Guarantee materials and workmanship for a period of one-year following Owner's final acceptance. 1.9 SEQUENCING AND SCHEDULING A. Coordinate work of other trades specified elsewhere. B. Do not perform soil preparation work in areas subject to the subsequent work of other sections, unless approved otherwise. C. Perform work in accordance with the approved schedule specified in paragraph 1.5 SUBMITTALS. If a schedule delay greater than three days occurs, immediately revise and resubmit schedule to reflect each schedule delay. 1.10 MAINTENANCE A. Maintain the work as specified in this section until final acceptance of the work. PART 2 - PRODUCTS 2.1 COMPOST A. Composted material must be in compliance with WA Department of Ecology's specifications, which appear in WAC Chapter 173-350 Section 220; plus the following additional requirements. B. Additional Requirements 1. The carbon to nitrogen ratio of the compost shall be below 25:1 or below 35:1 if the proposed plantings are composed entirely of plants native to the Puget Sound Lowlands region. 2. The compost shall have an organic matter content of 35% to 65%% as determined by "loss on ignition" test method. C. Alternative organic materials may be used in lieu of the specified compost if they meet the criteria for carbon to nitrogen ratio, contaminants (as defined in WAC Chapter 173-350 Section 220), and when mixed with existing native soil can achieve a calculated organic content of 5% for turf areas or 10% for planting beds. CSI Format Specification Section 028 Page 3 TOPSOIL D. Submit one -gallon sample, source, and letter of certification from the supplier to the Owner and/or Owner's Representative for approval prior to installation. 2.2 MULCH A. Specified compost, or fine ground freshwater bark, or stockpiled forest duff from the project site. B. Submit one -gallon sample, source, and letter of certification from the supplier to the Owner and/or Owner's Representative for approval prior to installation. 2.3 IMPORTED TOPSOIL A. A mixture of compost, meeting requirements of Section 2.1 above, and sand or sandy loam per USDA soil texture classification. The mixture shall contain a minimum of approximately 5% organic matter for turf areas or a minimum of approximately 10% organic matter for planting beds. The sand or sandy loam shall be free of weeds, deleterious materials, rocks, and debris. 100% of the imported topsoil shall pass through a 3/4" screen, less than 25% shall pass through a #200 sieve. B. Submit one -gallon sample, source, and letter of certification from the supplier to the Owner and/or Owner's Representative for approval prior to installation. PART 3 - EXECUTION 3.1 SOIL MANAGEMENT PLAN A. The Soil management Plan (SMP) will be submitted as part of site development / building permit application, and will include the following. 1. An 11" X 17" or larger site map indicating: Option 1. Areas where native soil and vegetation will be retained in place, Option 2. Areas where topsoil or subsoil will be amended in place, Option 3. Areas that will be stripped and stockpiled prior to grading for reapplication, and Option 4. Areas where imported topsoil will be applied. 2. Calculations for volumes of soil to be stockpiled, and amounts of amendment or topsoil to be imported to achieve specified minimum organic matter content. 3. Specified organic amendments and topsoil products to be used, with organic matter content and carbon to nitrogen documented by producer supplied copies of laboratory analyses to demonstrate that requirements will be achieved and that compost meets WAC Chapter 173-350 Section 220 definition of "Composted Material" ). 4. IF CALCULATED AMENDMENT RATES ARE TO BE USED, site soils to be amended and compost or alternative organic material must be characterized for the following properties: Soil- Bulk density, organic matter content and depth of compacted layers to a depth of 12 inches. Compost or alternative organic material Bulk density, organic matter content, carbon to nitrogen ratio, moisture content.. Soil samples must be gathered following the distribution plan outlined in the Post -Construction Inspection below, and be composed of material from the entire depth to be amended, excluding any surface mulch layers. Calculations by a Certified Soil Scientist, Crop Advisor or Agronomist must be provided showing that the organic content requirements will be met based on the organic contents and densities of both the site soil and amendments. CSI Format Specification Section 028 Page 4 TOPSOIL 3.2 PREPARATION A. Protect surrounding construction from damage caused by the work of this section. 3.3 SUBGRADES A. Prepare subgrades as specified in paragraph 3.4 AMENDMENT OPTIONS. 3.4 AMENDMENT OPTIONS A. Select the soil preparation option which best suits the project site. Different options may be used in different areas of the project. Choose either the "default" pre -approved amendment rate, or a qualified professional may calculate a custom rate based on soil and amendment tests described in Section 3.1.A.4. The selected soil preparation option(s) shall be shown on the Soil Management Plan approved with site development permit. OPTION 1: Leave Native Vegetation and Soil Undisturbed, and protect from compaction during construction Identify areas of the site that will not be stripped, logged, graded or driven on, and fence those areas to prevent impacts during construction. If not impacted, either in soils or vegetation, these areas do not require amendment. OPTION 2: Amend Existing Soil In -Place Scarification: Scarify or till subgrade to 8 inches depth (or to depth needed to achieve a total depth of 12 inches of uncompacted soil after calculated amount of amendment is added). Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. A. Planting Beds B. Turf Areas i. PRE -APPROVED RATE: Place and rototill i. PRE -APPROVED RATE: Place and rototill 3 inches of composted material into 5 inches 1.75 inches of composted material into 6.25 of soil (a total amended depth of about 9.5 inches of soil (a total amended depth of about inches, for a settled depth of 8 inches); 9.5 inches, for a settled depth of 8 inches); ii. CALCULATED RATE: Place and rototill ii. CALCULATED RATE: Place and rototill calculated amount of composted material or calculated amount of composted material or approved organic material into depth of soil approved organic material into depth of soil needed to achieve 8 inches of settle soil at needed to achieve 8 inches of settled soil at 10% or anic content 5% organic content. Rake beds to smooth and remove surface Water or roll to compact soil to 85% of rocks larger than 2 inches diameter. maximum. Mulch planting beds with 2 inches of organic Rake to level, and remove surface woody mulch. debris and rocks larger than 1 inches diameter CSI Format Specification Section 028 Page 5 TOPSOIL OPTION 3: Stockpile site topsoils prior to grading for reapplication. Amend with organic matter or add topsoil if necessary to achieve required organic content to 8 inches depth. Scarification: If placed topsoil plus compost or other organic material will amount to less than 12 inches: Scarify or till subgrade to depth needed to achieve 12 inches of loosened soil after topsoil and amendment are placed. Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. A. Planting Beds I B. Turf Areas Stockpile and cover soil with weed barrier material that sheds moisture yet allows air transmission, in approved location, prior to grading. Replace stockpiled topsoil prior to planting. i. PRE -APPROVED RATE: Place and rototill i. PRE -APPROVED RATE: Place and rototill 3 inches of composted material into 5 inches 1.75 inches of composted material or into 6.25 of replaced soil (a total amended depth of inches of replaced soil (a total amended depth about 9.5 inches, for a settled depth of 8 of about 9.5 inches, for a settled depth of 8 inches); inches); ii. CALCULATED RATE: Place and rototill ii. CALCULATED RATE: Place and rototill calculated amount of composted material or calculated amount of composted material or approved organic material into depth of approved organic material into depth of replaced soil needed to achieve 8 inches of replaced soil needed to achieve 8 inches of settled soil at 10% organic content settled soil at 5% organic content. Rake beds to smooth and remove surface Water or roll to compact soil to 85% of rocks larger than 2 inches diameter. maximum Mulch planting beds with 2 inches of organic Rake to level, and remove surface rocks larger mulch or stockpiled duff. than 1 inches diameter. OPTION 4: Import topsoil meeting organic matter content standards. Scarify or till subgrade in two directions to 6 inches depth. Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. A. Planting Beds: Use imported topsoil mix B. Turf Areas: Use imported topsoil mix containing 10% organic matter (typically containing 5% organic matter (typically around around 40% compost). 25% compost). Place 3 inches of imported topsoil mix on Place 3 inches of imported topsoil mix on surface and till into 2 inches of soil. surface and till into 2 inches of soil. Place 3 inches topsoil mix on surface. Place 3 inches topsoil mix on surface. Rake beds to smooth, and remove surface Water or roll to compact soil to 85% of rocks over 2 inches diameter. maximum. Mulch planting beds with 2 inches of organic Rake to level, and remove surface rocks larger mulch. than 1 inches diameter. 3.5 INSPECTION AND VERIFICATION A. Pre -Grading Inspection: Prior to the commencement of site work, contact the Owner and/or Owner's Representative to provide an inspection to verify the delineation and protection of native soils and vegetation to remain in place, and to verify the proposed location for topsoil and material stockpiling. Make corrections and adjustment as directed by the Inspector. CSI Format Specification Section 028 Page 6 TOPSOIL B. Interim Grading Inspection: Prior to the placement of soil amendments, contact the Owner and/or Owner's Representative to provide an inspection to verify that specified erosion control methods have been implemented, the location of stockpiled soil and materials, and that subgrades are consistent with the Soil Management Plan. Make corrections and adjustment as directed by the Inspector. B. C. Post -Installation Inspection: Prior to planting, contact the Owner and/or Owner's Representative to provide an inspection to verify that the placement of amendments and soil preparation is consistent with the Soil Management Plan. Provide delivery tickets for soil amendments to verify the quantity of material specified on the Soil Management Plan. Make corrections and adjustment as directed by the Inspector. D. Mulch Placement Verification: At the completion of planting, contact the Owner and/or Owner's Representative to provide a review to verify that mulch has been installed as specified. E. Secondary Verification for Failing Sites: If the Inspector determines that the installation does not meet the conditions of the approved Soil Management Plan, additional testing by an independent certified soil consultant will be ordered by the Inspector and paid for by the contractor. Make corrections and adjustment as directed by the Inspector. 3.10 FINAL ACCEPTANCE AND PAYMENT A. Final acceptance and payment for soil preparation will be contingent on the approval of all inspections, and that the soil preparation is consistent with these specifications and with the approved Soil Management Plan. END OF SECTION Notes Learn more at www.SoilsforSalmon. and see additional factsheets for builders and construction managers at www.BuildinciSoil.org 44