STORMWATER/WATER QUALITY
Treatment of Roof Runoff for Zinc Removal by Filtration Media
Study, Port of Seattle
(2003-present)
Taylor Associates, Inc. is conducting a study to monitor and evaluate the efficacy of three filtration media for treating stormwater runoff from an aluminum-zinc alloy-coated steel rooftop at Seattle-Tacoma International Airport (STIA). Flow-paced composite samples (inflow and outflow) are collected during each targeted storm event. Six storms have been sampled so far with 24 samples collected and analyzed for several water quality parameters. The results will support future applications of the tested media for treatment of other metal-roof runoff at STIA. For this study, Taylor Associates, Inc. prepared the QAPP, designed the testing facility, and fabricated and installed the monitoring components. The system design provides for collection of flow-weighted composite samples and flow measurements of the influent and effluent stream of each filter unit without modifying the intended hydraulics of the system. Taylor Associates, Inc. designed, calibrated and installed an elevated flow splitting device to measure inflow and to distribute water evenly to all three filter units simultaneously. Effluent from each unit is routed through above ground piping equipped with V-notch weirs and bubbler flow meters. The overall monitoring design is consistent with Washington state TAPE protocols for BMP testing.
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