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EXH AR025100: Deposition Edward O’Brien — ACC v. Ecology & Port, PCHB No. 01-133

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This document is a deposition of Edward O'Brien, taken on December 21, 2001, as part of a Pollution Control Hearings Board case in Washington State involving the Airport Communities Coalition challenging the Department of Ecology and the Port of Seattle. O'Brien discusses stormwater management techniques, including infiltration facilities, which can be used to treat stormwater quality and mitigate low-flow impacts on surface water systems connected to groundwater. He explains that while infiltration can delay and filter stormwater flows through soil profiles, precise control over timing and flow rates is limited and depends on site-specific soil and hydrological conditions.

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Deposition upon oral examination of Edward O’Brien, taken December 21, 2001, in PCHB No. 01-133, Airport Communities Coalition (ACC) v. State of Washington Department of Ecology and Port Of Seattle, before the Pollution Control Hearings Board. Testimony covers stormwater management topics including infiltration facilities, trench systems, low flow mitigation, best management practices (BMPs), soil profile treatment, groundwater-surface water hydraulic connection, timing of flow to streams, and stormwater quality control. O’Brien discusses the Washington State stormwater manual, infiltration as a treatment BMP, soil type effects on flow timing, and pollutant removal prior to groundwater contact. Held at 2425 Bristol Court Southwest, Room 146, Olympia, Washington. Court reporter: Cindi L. Ullman, CCR# ULLMACL530OP. AR 025100–025102.

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