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WASHINOTON STATE <br /> DEPARTMENT OF <br /> ECOLOGY October 2007 <br /> GENERAL USE LEVEL DESIGNATION FOR PRETREATMENT (TSS) <br /> For <br /> CONTECH Stormwater Solutions Inc. CDS® System <br /> Ecology's Decision: <br /> Based on the CONTECH Stormwater Solutions Inc. (CONTECH) application <br /> submissions for the CDS®System and recommendations by the Technical Review <br /> Committee(TRC),Ecology hereby issues the following use designations for the <br /> CDS stormwater treatment system: <br /> 1. General Use Level Designation (GULD)for pretreatment use,as defined in the Ecology <br /> Stormwater Management Manual for Western Washington Volume V, (a) ahead of <br /> infiltration treatment,or(b)to protect and extend the maintenance cycle of a basic or <br /> enhanced treatment device(e.g., sand or media filter). This GULD applies to 2400 <br /> micron screen CDS®units sized per the table below at the Water Quality design flow <br /> rate as determined using the Western Washington Hydrology Model (WWHM). The <br /> following table shows flowrates associated with various CDS models: <br /> Washington State System Sizing <br /> Design Treatment Flowrate <br /> CDS Model ID (cfs) <br /> PMIU20-15 0.7 <br /> PMSU20-15-4 0.7 <br /> PMSU20-15 0.7 <br /> PMSU20-20 1.1 <br /> PMSU20-25 1.6 <br /> PMSU30-20 2 <br /> PMSU30-30 3 <br /> PMSU40-30 4.5 <br /> PMSU40-40 6 <br /> PSWC30-20 2 <br /> PSW30-30 3 <br /> PSWC30-30 3 <br /> PSWC40-30 4.5 <br /> PSWC40-40 6 <br /> PSW50-42 9 <br /> PSWC56-40 9 <br />