EXH0684025100

PCHBPollution Control Hearings Board of the State of Washington

You could also infiltrate water in a trench system where you have pipes under the ground with holes in them, and the water could come out of the -- out of your conveyance system or out of the treatment system and go into that distribution system below the ground surface and then infiltrate. Q. Can you use infiltration facilities to specifically mitigate the low flow impacts and surface water system to which the ground water is discharging? A. Can? Yes, I think you can. It depends on the situation, I guess. Q. Can you control the timing of the flow from infiltration facilities tO the stream? A. Can you control the timing of the flows. To a limited extent. What you're doing -- it depends on the hydrology of each situation. But if you're -- you're essentially taking a surface water flow, which may be discharging over a short time period into a stream and instead moving it into the ground where it will have to move through a soil profile to get -- if it's hydraulically connected to the stream, it has to move that direction, and it's probably going to move -- depending upon the size of particles you're going through, it moves more slowly. So depending on your soil type will impact how much you're delaying that flow from potentially getting into the stream EDWARD O'BRIEN; December 21, 2001 _ YAMAGUCHI OBIEN & MANGIO (206) 622-6875 AR 025101 anyway. So it varies with -- with that. It…
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