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EXH AR023932: Email & Table 4.1-1 Natural Resource Mitigation Plan — MRNP Summary Tables Third Runway STIA Master Plan Update 2001

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Sea-Tac Airport
Third Runway
PCHB
Box 10

This 2001 Natural Resource Mitigation Plan document for Seattle-Tacoma International Airport outlines proposed environmental mitigation actions associated with construction of a new third runway and related facilities. It details a sequenced approach to avoiding, minimizing, and compensating for impacts to wetlands, Miller Creek, Des Moines Creek, and other natural resources. Key measures include constructing retaining walls to protect wetlands, restoring the Vacca Farm floodplain, establishing forested stream buffers, and providing a $300,000 trust fund for fisheries habitat enhancement.

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Email chain dated September 13, 2001 from Art Anderson (Parametrix) to Erik Stockdale, forwarded to Ann Kenny, transmitting Table 4.1-1 and Table 4.1-3 from the Natural Resource Mitigation Plan (NRMP), 2001, for the Seattle-Tacoma International Airport Master Plan Update (Third Runway project). Table 4.1-1 summarizes mitigation actions and their relation to NEPA, SEPA, and Clean Water Act (CWA) mitigation sequencing requirements for the New Third Runway, Runway Safety Areas, and South Aviation Support Area (SASA). Specific mitigation actions address wetlands (Categories II and III), Miller Creek, Des Moines Creek, Vacca Farm floodplain restoration, Borrow Areas 1 and 3, Tyee Valley Golf Course, stormwater pollution prevention plans (SWPPPs), NPDES compliance, large woody debris (LWD), and a $300,000 trust fund for fisheries habitat. AR023932, exhibit filed in PCHB third-runway-eis proceeding.

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