Notice of Clear and Grade Permit Authorizing the Removal and Clean-Up of Contaminated Soils from 22417 SE 4th Street

Release Date: March 16, 2021

Notice is hereby given that the City of Sammamish issued a Clear and Grade Permit (CG2020-04547) on March 11, 2021, to Sound Earth Inc. for a soil remediation project in the Town Center.  The site is located at 22417 SE 4TH Street.  The permit authorizes the removal and clean-up of approximately 2,400 cubic yards of contaminated soils from the property as allowed by code.  Based on the historical records, the residence on the property was heated by an oil-burning furnace, the fuel for which was stored on site.  After conducting sampling and soil characterizations, Sound Earth Consultants identified contaminated soils near and within the footprint of the previous residence attributed to a leaking underground fuel storage tank.  Evidence was also found that the underground storage tank and on-site septic tank may have been used to store gasoline all of which have contributed to the contamination and environmental hazards.

As a result, Sound Earth Consultants recommended the soil to be excavated and removed to stop the migration of the hazardous fuel, eliminates risks at the site, and improves the environmental health of the site and adjacent properties.  Once the contaminated soil is removed, the disturbed area will be backfilled and seeded. 

Because of the quantity of soil to be removed, the project was subject to environmental review by the City.  The City issued a SEPA threshold determination (DNS) on February 25, 2021.  No comments were received on the DNS nor were any appeals filed.  The permit approval includes several trees to be removed as a result of the excavation and that were identified as having contamination from the leaking fuel.  The applicant has indicated that the project will begin sometime this spring and be completed within approximately three weeks after excavation commences. 

If you have any questions regarding the project or the permit review process don’t hesitate to contact Chris Hankins, Senior Planner at