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Here's one of the design engineer's contact info. <br /> RR <br /> Christina Totland <br /> Stormwater Design Engineer <br /> CONTECH Stormwater Solutions Inc. <br /> treatment, retention and detention <br /> 11835 NE Glenn Widing Dr, Portland, OR 97220 <br /> T: 503.258.3149 F: 800.561.1271 <br /> Toll Free: 800.548.4667 x149 <br /> totlandQ@contech-cpi.com <br /> contech-cpi_com <br /> contechstormwater.corn <br /> 4/14/2008 <br />