Section 401 Certification Synthetic Precipitation Leaching Procedure Work Plan

Notes

This Work Plan provides an alternative methodology for meeting fill suitability criteria under Ecology’s Water Quality Certification and the U.S. Fish and Wildlife Service’s Biological Opinion for the Port of Seattle’s third runway embankment and other Port 404 Projects. It describes procedures for using the Synthetic Precipitation Leaching Procedure (SPLP) to determine the suitability of fill for the Section 401 Certification. The document outlines screening criteria, soil criteria tables, and testing protocols for fill materials placed in the embankment.

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