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• <br /> • SECTION SIX <br /> FIELD GUIDE TO VERIFYING SOIL QUALITY AND DEPTH <br />• IN NEW LANDSCAPES <br /> This guide is provided to help professional <br /> inspectors verify implementation of soil <br />• improvements to fulfill BMP T5.13 "Post STEP 2: Inspect delivery tickets for compost, <br /> Construction Soil Quality and Depth" in the topsoil and mulches. <br /> Washington Department of Ecology's <br /> Stormwater Management Manual Western Permitee must provide original delivery tickets for all soil <br /> Washington. and mulch products. Compare delivery tickets with the <br /> SMP to match the following information: <br />,0 • Delivery location. <br /> The main conditions to be confirmed are: • Total quantities for each soil product and mulch. <br /> 1. Provision of eight inches of topsoil containing 10% • Product descriptions and sources. <br /> organic matter in planting beds,or 5%in turf areas. If materials other than those listed in the SMP were <br /> 2. Scarification of compacted subsoil four inches below delivered,laboratory test results must be provided to <br /> the topsoil layer(for a total uncompacted depth of 12 confirm that they are equivalent to approved products. <br />'0 inches). <br /> 3. Placement of two inches of mulch on all planting <br /> beds. STEP 3: Verify depth of amended soil and <br /> scarification. <br /> Use a shovel to dig at least one test hole per acre for turf <br /> I• Site Inspection Supplies and one per acre for planting beds to verify eight inch <br /> • A copy of the approved Soil Management Plan(SMP)for topsoil depth(below mulch layer),incorporation of <br /> the site,with site drawing. <br /> A sturdy shovel amendments,and four inches of uncompacted subsoil. <br /> •• Tape measure or 12"ruler <br /> • 3/8 inch diameter 3-4 foot stainless steel"rod <br /> penetrometer"with a 1/8"bevel cut into the tip at 30 <br /> 10 degrees from the side,and a 90 degree bend at top to form <br /> a handle(see illustration,next page). <br /> • Field Verification Form to record results MULCH `t. ti.°�'fR <br /> •y d <br /> LOOSE SOIL • '� • <br /> I• The followingsteps maybe completed at multiple visits with visible dark <br /> p p p organic matter 8 <br /> as a project progresses or in one final project approval <br /> inspection,depending on local practices: LOOSE OR <br /> • <br /> FRACTURED 1 <br /> STEP 1: Compare site conditions with approved <br /> SUBSOIL e " � <br /> I• Soil Management Plan (SMP). ----- <br /> The SMP approved with the site permit describes soil <br /> treatments approved for each area.Make sure site Test holes should be about one foot deep(after first <br /> conditions match these details in the SMP: scraping away any mulch)and about one foot square. <br /> • Site location and permit holder. <br /> • Turf and planting areas match approved drawings. Eight Inch Depth of Amended Soil.The top eight inches <br /> • Areas to remain as undisturbed native soil and of soil should be easy to dig using a garden spade driven <br /> vegetation have been fenced off during construction to solely by your weight.The soil should be darker than the <br /> unamended soil below,and particles of added organic <br /> prevent soil compaction or damage to plants. <br /> 14 <br />