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Are amended soils required in Kirkland?

April 26, 2017kirkland soils

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Are amended soils required in Kirkland?

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Projects that are one acre or larger are required to use the amended soils requirements in Ecology’s BMP T5.13 for all landscaped areas. Smaller projects are encouraged to use amended soil in landscaping areas where ever feasible.

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Projects sites that are 1 acre or greater, and add 2,000 ft2 or more new impervious area or have land disturbing activity involving 7,000 ft2 or greater, are required to add amended soil to the landscaped areas (follow Ecology’s BMP T5.13, per Minimum Requirement #5: On-site Stormwater Management). This includes mixing 2-3″ of compost with organic matter into the upper 8″ topsoil layer, and loosen 4″ of the subsoil. The permit applicant must provide original delivery tickets for all soil and mulch products, and the soil and mulch contents must meet the content ratios stated in BMP T5.13. See Amended Soil Requirements document for more information.