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EXH 277: Email Chain – Proposed Language Condition E(1)(b) Third Runway Fill Criteria SPLP Testing Drainage Layer Cover

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Sea-Tac Airport
Third Runway
PCHB
Box 09

In September 2001, representatives from the Port of Seattle and the Washington Attorney General's office exchanged emails negotiating the language of Condition E(1)(b), which governs fill material criteria for an embankment construction project. The proposed language would allow the Port to use a 'drainage layer cover' design and to demonstrate fill suitability through Synthetic Precipitation Leaching Procedure (SPLP) testing as an alternative to standard fill limitations. Under the proposal, SPLP test results would be submitted to the Washington Department of Ecology at least ten business days before any fill placement.

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Email chain dated September 8, 2001 among Tom Newlon (Port of Seattle), Joan Marchioro (Washington Attorney General’s Office), Tom Walsh, Jay Manning, and Linn Gould regarding proposed new language for Condition E(1)(b) governing fill criteria for imported fill material in the third runway embankment. Newlon redrafts proposal to include a ‘drainage layer cover’ concept (40 ft thick at embankment face, reducing east at 2% grade), Synthetic Precipitation Leaching Procedure (SPLP) SW-846 Method 1312 as an alternative suitability demonstration method, and a 10-business-day notice to Ecology before fill placement. Discusses MTCA Method A never-to-exceed thresholds, natural metals variability due to volcanism, and fallback positions on written approval requirements. Marked Confidential Attorney-Client Privileged Communication. AR 019517–019519; exhibit identifier EXH0277.

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