EXH2003029208

PCHBPollution Control Hearings Board of the State of Washington

These meetincc notes have been prepared by Kate Snider, Floyd & Snider Inc. ATTENDEES Ann Kenny, Dept. of Ecology KellyWhiting, King County Keith Smith, Port of Seattle Paul Fendt, Parametdx Joe Brascher, Aquaterra Kate Snider, Floyd Snider McCarthy MEETING SCOPE AND AGENDA A conference call was held to discuss the Port's proposed modified approach to work within Walker Creek basin, as defined in the lowflow submittal delivered to Ecology on July 23. WALKER CREEK APPROACH MODIFICATIONS • Port calculations determined that runoff from additional impervious areas ".-hould be directed to the reserve vaults in the Walker Creek Basin in order to ccnfi:m water availability in _ne worst wate r years. Two mechanisms are proposed to direc,_ the additional water to the va_:;s: 1. ,;-mimpermeable cover will be constructed on pon,: F ih_t allow:- _"_ter f.st'i, ;a on the 2+ "_creFond F area to be channeled to W;:.iker Creek '..:_,:',is. 2. Lining will be installed in selected filter strip areas adjacent to runways b. ;he Walker Creek basin. This lining will allow runoff wate from the runways to, be treated with the filter strips and subsequently collected and directed to the Walker Creek vault. • The goal of the above changes is to meet the requirements for water input to the Walker Creek vaults, while maintaining the assumpt! ;.ns on impermeable are_. :_t.>d in the SMP. All filter stria areas will not be lined. Only these areas ne;-_=ssa_yto meet the defined goal will De lined. • The lining of filter strips…
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