EXH0240018981

PCHBPollution Control Hearings Board of the State of Washington

Subject: Preliminary Comments (Set 2) on August 2000 Stormwater Management Plan tbr Seattle-Tacoma International Airport Master Plan Update Improvements. This letter is our second installment of preliminary review comments on the August 2000 Stormwater Management Plan, and should be read as a continuation of our letter dated September 2 l, 2000. As explained in the first installment: our comments are being provided on an incremental basis because of delays in our being provided the SMP and the lack of adequate time to provide comprehensive review comments. This letter focuses on project impacts to stream base flows and seepage flows to wetlands. The current SMP does not adequately assess project impacts and does not demonstrate that there will be appropriate mitigation for predictable project impacts. These are not new concerns. The August 2000 SMP continues to provide conflicting information which fails to consistently recognize the impacts and consequently fails to propose sufficient mitigation. We recently questioned the Port's commitment to base flow mitigation and preservation of seepage flows during a meeting with Ecology on August 3, 2000 with follow-up by an email on August 7, 2000 from Bill Rozeboom to Eric Stockdale as follows: At our meeting last week, you asked me to provide something in writing to supplement my statement that the present design offers no assurance that seepage flows will be preserved to wetlands below the proposed 3rd embankment. My statement is based in part on the following text which is in the public record from the Port's March…
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