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. Developing a Soil Management Plan — SECTION FIVE Step 3: Select Amendment Options. Step 5: Calculate Amendment, Topsoil The most convenient and economic method for achieving and Mulch Volumes on SMP form • the Soil Quality and Depth guidelines depends on: site soil • For Pre-Approved amendment rates,figure the square conditions,grading,and resulting subgrade compaction; footage of each area and complete the simple the practicality of stockpiling topsoil during grading;and calculation to convert inches of amendment into cubic site access issues. yards. "Pre-Approved"or custom calculated rates? • To compute custom calculated amendment rates,use Use of"Pre-Approved" amendment rates may simplify soil and amendment test results and the Model • Amendment Rate Calculator Spreadsheet and/or the planning,however custom calculated rates can save substantial effort and expense easily repaying the Equation for Calculating Compost Application Rates expense of testing and calculations. (See testing required (both are in Section 7"Resources")to achieve the for custom rates at right and on next page,and calculation target Soil Organic Matter content(10%SOM for method in Section 7"Resources") landscape beds,or 5%SOM for turf areas). Often pasture or woodland soils have adequate organic matter if existing organic layers are preserved.Also, compost products will frequently provide the desired soil Site Assessment Supplies organic matter content at lower applications than the Pre- • Copy of site grading plan Approved rates(which are based on"average"conditions). • Sturdy shovel • Tape measure • Identifying Options on the Site Plan and SMP form If using custom calculated amendment rates requiring soil tests: • Identify the areas where each amendment option will • Clean bucket or stainless steel bowl for mixing soil samples be applied by outlining each area on the site plan with • Sealable bags for soil samples,and indelible ink pen to label 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. Sampling and Testing for Custom Calculated Amendment Rates Soil and amendments submitted for testing should be a Step 4: Identify Compost, Topsoils and composite of samples taken from several spots on a site or Other Organic Materials for Amendment in a pile of amendment. and Mulch. • Amendments for Pre-Approved rates must be compost Soil. meeting the definition for"Composted Materials"in WAC Gather samples from soil that will be the subgrade after all 173-350,section 220,(available online at grading operations are completed,before placement of http://www.ecy.wa.gov/programs/swfa/compost/)or imported topsoil or amendments. topsoil manufactured from these composts plus clean sand • Take samples from 10-12 spots in each area.Imagine . or sandy loam soil. Products must be identified on the Soil a line dividing the area in half lengthwise,then divide Management Plan form,and recent product test results each half into five near equal sized widths.Take must be provided showing that they meet the additional samples near the middle of each subsection. requirements in this Guide for organic matter content and • At each sampling spot dig a spades-width hole at least carbon to nitrogen ratio(see specification in Section 3). 8 inches deep,then shave a 1 inch slice from the side For Custom Calculated amendment rates(see right, of the hole to use in the composite sample. • next page,and formula in Section 7"Resources"), • Thoroughly mix the 10-12 samples from each turf or organic matter may be provided by: planting area together in a clean plastic bucket or • Compost(as defined above),or bowl.Place 2 cups of the mix into a sealable plastic bag for testing(some tests may require more soil,ask • Other by organic materials with a carbon to nitrogen laboratories). ratio under 25:1 (35:1 for native plantings),meeting • the same contaminant standards as"Composted • Label the bag with the site information,area of Materials"in WAC 173-350,section 220. sample;plus your name,address and phone number. These products must be identified on the Soil Management Amendment: Plan form,and recent test results provided showing that Producers of composts and manufactured topsoils can they meet these requirements. usually provide test results for their products.If tests are • 11