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CITY OF EVERETT SPECIAL PROVISIONS 8-02.3(18) Post Construction Soil Quality and Depth Post Construction Soil Quality and Depth shall apply to all disturbed within a Project which will not be covered with pavement or other hard surfacing. These specifications are designed to protect or restore disturbed soils to a condition functionally similar to an undisturbed soil to promote infiltration and pollutant capture. 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, 2. Topsoil pH from 6.0 to 8.0 or matching the pH of the undisturbed soil. 3. 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. 4. Planting beds mulched with 2 inches of organic material 5. The resulting soil should be conducive to the type of vegetation to be established. 8-02.3(18)A Post Construction Soil Quality and Depth The Contractor may, at their discretion, achieve the Post Construction Soil Quality and Depth requirements using any of the following methods, or a combination thereof. 1. Leave undisturbed native vegetation and soil and protect from compaction during construction. 2. Amend existing site topsoil or subsoil either at "preapproved" default 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 "pre-approved" default 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. 8-02.3(18)B Amendment of Existing Soils 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). Topsoil may be amended at "pre-approved" rates or at a custom calculated rate complying with the following: Planting Beds Jackson Park Area Stormwater Separation September 2020 WO No. -UP3703 Division 8—MISC CONSTRUCTION SP-168