EXH1026037221

Submitted 9/_1/01 to Water Envtronment Federation for presentatton at Watershed 2002 conference, Febralary 2002. 7"i:::paper to appear m conference proceedmgs. Copyright 200i standard CSF® and soybean hull media have been selected for onsite stormwater treatment BMP testing at the Seattle-Tacoma International airport. KEYWORDS NPDES, stormwater, metals, toxicity, filtration, media, BMPs INTRODUCTION This paper presents the results of a best management practice (BMP) screening study designed to test the effectiveness of filtration media to reduce metals and potential toxicity of stormwater runoff. This work is a follow up to needs identified by NPDES stormwater sampling, whole effluent toxicity (WET) testing and source tracing conducted in the recent past by the Port of Seattle (the Port) at Seattle-Tacoma International Airport (Port of Seattle 2000, Tobiason et al, 2000). These past studies indicated that stormwater runoff toxicity was associated with zinc from building materials used in certain drainage areas at the airport. Results of this media filtration screening will be used to select media for onsite testing as a storrnwater treatment BMP at the airport. This future testing may include long-term performance monitoring to determine filtration media stability, lifecycle capabilities and maintenance intervals. Though there is considerable volume of literature that evaluates metals and other constituent removal by conventional stormwater BMPs, there are few if any studies that have addressed toxicity as well (ASCE 1999, CWP 2000). Most, if not all stormwater guidelines for BMP performance are based solely on their constituent removal performance on a percentage basis (the difference between influent and…

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Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]