Achieving the Post-construction Soil Standard
Compost and topsoil calculator for meeting post-construction soil standards (King County Code 16.82)
Learn how to meet King County's Post-construction soil standard requirements Download PDF 1 MB.
The Compost and Topsoil Calculator below is for use by permit applicants to determine the compost and/or topsoil needs for site development projects to meet the post-construction soil standard required by King County's Clearing and Grading regulations KCC 16.82. This information must be included on the Soil Management Plan Download Microsoft Word document 900 K form required as part of the permitting process. Steps for preparing a Soil Management Plan are found on pp. 8-9 in the Achieving the Post-construction Soil Standard brochure Download PDF 1 MB.
The calculator can calculate:
Follow these four steps to determine compost or topsoil needs and provide results as required by the permitting process:
Step 1: Determine which soil management option(s) are needed for each area marked on project site map by reading Achieving the Post-construction Soil Standard brochure Download PDF 1 MB (pp. 4-6).
Step 2: Choose Turf or Planting beds and determine Amendment rate of compost needed: