10617 ROSEWOOD AVE 2022-01-25 - Laserfiche WebLink

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 S M P 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 planning,however custom calculated rates can save Amendment Rate Calculator Spreadsheet and/or the 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). 10 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: • Clean bucket or stainless steel bowl for mixing soil samples • Identify the areas where each amendment option will • Sealable bags for soil samples,and indelible ink pen to label 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 Sampling and Testing for • form. Custom Calculated Amendment Rates Soil and amendments submitted for testing should be a composite of samples taken from several spots on a site or Step 4: Identify Compost, Topsoils and in a pile of amendment. Other Organic Materials for Amendment and Mulch. Soil: • Amendments for Pre-Approved rates must be compost Gather samples from soil that will be the subgrade after all meeting the definition for"Composted Materials"in WAC grading operations are completed,before placement of 173-350,section 220,(available online at imported topsoil or amendments. www.ecy.wa.gov/programs/swfa/organics/soil.html)or topsoil • Take samples from 10-12 spots in each area.Imagine manufactured from these composts plus clean sand or a line dividing the area in half lengthwise,then divide • sandy loam soil. Products must be identified on the Soil each half into five near equal sized widths.Take Management Plan form,and recent product test results samples near the middle of each subsection. must be provided showing that they meet the additional • At each sampling spot dig a spades-width hole at least requirements in this Guide for organic matter content and carbon to nitrogen ratio(see specification in Section 3). 8 inches deep,then shave a 1 inch slice from the side of the hole to use in the composite sample. For Custom Calculated amendment rates(see right, • Thoroughly mix the 10-12 samples from each turf or • next page,and formula in Section 7"Resources"), planting area together in a clean plastic bucket or organic matter may be provided by: bowl.Place 2 cups of the mix into a sealable plastic • Compost(as defined above),or bag for testing(some tests may require more soil,ask laboratories). • Other by organic materials with a carbon to nitrogen • Label the bag with the site information,area of ratio under 25:1 (35:1 for native plantings),meeting the same contaminant standards as"Composted sample;plus your name,address and phone number. • Materials"in WAC 173-350,section 220. Amendment: These products must be identified on the Soil Management 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 I. 11