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Permit Number COG070000 <br />Facility Number: C00073109 <br />Page 1 a <br />Colorado Discharge Permit System Regrdadons (Regulation No. 61) <br />CERTIFICATION <br />under <br />GENERAL PERMIT FOR CONSTRUCTION DEWATERING OPERATIONS (SIC No: 1629) <br />Category 07, Subcategory Z, General Permits, Current fee.- $500 per year/ long term per CRS 25-8-S02 <br />All correspondence relative to this facility should reference the specific facility number, COG073109. <br />This certification specifically authorizes Steven M. Zigan to discharge as described below and in accordance with the <br />General Permit for Construction Dewatering Operations. <br />Pernrlttee <br />Steven M. Zigan <br />10900 E. 1260' Avenue <br />Brighton, CO 80601 <br />Contact <br />Steve Zigan <br />Phone: 720.244.8251 <br />Email: zig@mesanetworks.net <br />- - Site Name; Construction Activity;-and Location <br />Zigan Home Owners Association-The project includes groundwater pond dewatering located at 10900 E. 12601 Avenue in <br />Unincorporated Adams County, Colorado 80601. The discharge will occur at Latitude: 39.9240 N, Longitude: <br />-104.862°W. <br />Discharge Point <br />Outfalls Description Estimated Flow Rate <br />001A Dewatering will discharge 500 feet south of 124 Avenue to <br />the South Platte River. Ave: 600 gpm <br />Effluent Limitations <br />The discharge is to the South Platte River, within Segment 15 of the Upper South Platte River Sub-basin, South Platte <br />River Basin, found in the Classifications and Numeric Standards for the South Platte River Basin (Regulation No. 38; last <br />update effective March 30, 2009). Segment 15 is Use Protected, and is classified for the following beneficial uses: <br />Aquatic Life, Class 2 Warm; Recreation Class la; Water Supply; and Agriculture. <br />Permit Limitations and Monitoring Requirements, for Outfall 001A <br /> Discharge .Limitations..... <br />Parameter Maximum Concentrations Monitoring Sample <br /> 30-Day <br />Average 7-Day <br />Average Daily Max. Frequency Type <br />-- --.-___-_-A llcable to al l Discha es----? -- -_-----------------_- <br />Flow, MGD Report NA Report Weekly Instantaneous or <br /> Continuous <br />Total Suspended Solids, <br />1 30 45 NA Weekly Grab <br />m <br />Oil and Grease, m l NA NA 10* Weekly Visual* <br />pH, s u. (Minimum- <br />Maximum) NA NA 6.5-9.0 Weekly 1n-situ <br />' Ifa visible sheen is observed, a grab sample shall be collected and analyzed for oil and grease. <br />ISSUED AND EFFECTIVE: JULY 10, 2009 EXPIRATION. NOVEMBER 31 2011