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EXH AR022903: Sec 401 Cert Synthetic Precipitation Leaching Procedure Work Plan, Attach E — Water Quality Cert #1996-4-02325 (Amended -1)

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Sea-Tac Airport
Third Runway
PCHB
Box 09

This September 2001 Work Plan Attachment describes the fill suitability testing procedures required for the Port of Seattle's third runway embankment construction at Sea-Tac Airport, outlining how soil and fill materials must meet Washington State and U.S. Fish and Wildlife Service environmental standards. It explains the Synthetic Precipitation Leaching Procedure (SPLP), a laboratory test used to determine whether fill materials could release harmful metals or chemicals into groundwater. Materials failing the screening criteria must be rejected or undergo additional testing before being approved for use in the embankment.

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Attachment E to Port Of Seattle Water Quality Certification #1996-4-02325 (Amended -1), dated September 21, 2001, describing the Section 401 Certification Synthetic Precipitation Leaching Procedure (SPLP) Work Plan for the third runway embankment fill suitability screening. Document covers SPLP testing methodology per SW-846 Method 1312 and WAC 173-201A, MTCA (Model Toxic Control Act) WAC 173-340-747(7) three-phase partitioning screening criteria, fill soil criteria for 14 metals and TPH including chromium, lead, nickel, diesel, barium, selenium, silver, RCRA 8 metals, drainage layer cover screening, FWS Biological Opinion (BO) FWS Reference Number 1-3-00-F-1420, Ecology Certification criteria, Puget Sound background concentrations at 90th percentile, Miller Creek dilution factor of 20, and upper/lower bound limits for the Port 404 Projects embankment. AR022903–AR022905.

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