EXH 455: Water Quality Cert #1996-4-02325 Fill Acceptance Conditions Third Runway Embankment pp.14–16

This document outlines Washington State Department of Ecology conditions for accepting imported fill material used in construction of Sea-Tac Airport's Third Runway and associated Master Plan improvements. It requires the Port of Seattle to submit environmental assessments of fill sources — including records reviews, site reconnaissance, and soil sampling for hazardous substances such as arsenic, lead, and mercury — at least ten business days before placing any fill. Specific contamination limits (e.g., arsenic at 20 mg/kg, lead at 220/250 mg/kg) and minimum sampling schedules based on fill volume are established to prevent toxic materials from entering state waters and wetlands.

Notes

Exhibit 455, AR 022897–022899. Pages 14–16 of Water Quality Certification #1996-4-02325, issued August 10, 2001 by Washington State Department of Ecology (Ecology) governing Port Of Seattle Third Runway embankment construction and Master Plan Update Improvements. Sets conditions for acceptance of imported fill including borrow site clean fill certification, Phase I and Phase II Environmental Site Assessment (ASTM E 1527-00, E 1903-97), records review of Ecology databases (Confirmed & Suspected Contaminated Site Report, Underground Storage Tank List, Leaking Underground Storage Tank List, Site Register), site reconnaissance, and fill source sampling. Minimum sampling schedule by cubic yards of soil. Fill criteria table (mg/kg) for hazardous substances including antimony (16), arsenic (20), beryllium (0.6), cadmium (2), chromium (42/2000), copper (36), lead (220/250), mercury (2), nickel (100/110), selenium (5), silver, thallium, zinc, and NWTPH-HCID. Chromium (VI) analysis required if Phase I shows likelihood of contamination. Submitted to Ecology Federal Permit Manager, SeaTac Third Runway. PCHB third-runway-eis administrative record.

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