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STATE OF COLORADO <br />COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT <br /><0 <br />WATER QUALITY CONTROL DIVISION aw °-C <br />TELEPHONE: (303) 692-3500 <br />* o <br />CERTIFICATION TO DISCHARGE ** <br />UNDER 's'6 <br />CDPS GENERAL PERMIT COR-0400000 <br />METAL MINING INDUSTRY <br />Denison Mines USA Corp <br />Certification Number COR040248 <br />This Certification to Discharge specifically authorizes: <br />LEGAL CONTACT: LOCAL CONTACT: <br />Philip Buck, VP Mining Ops <br />Denison Mines USA Corp <br />1050 -17 St Ste 950 <br />Denver, CO 80265 <br />Phone # 3031628-7798 <br />pbuck@denisonmines.com <br />Danny Flannery, Mine Compliance Tech <br />Phone # 435-678-0121 <br />dflannery@denisonmines.com <br />Industrial Activity : Uranium and Vanadium Mining Activities; Soil disturbance, <br />development rock and ore stockpiling; Ancilary facilities; Mine shaft, Buildings, <br />and Mine ventillation <br />Primary SIC Code: 1094 to discharge stormwater from the facility identified as <br />Van 4 Shaft Monogram Mesa <br />which is located at: <br />Near CR DD19 & CR HH16 <br />Latitude 38/12/43, Longitude 108/43/58 <br />In Montrose County <br />to:Wild Horse Draw, Dolores River <br />Certification is effective: 11/17/2008 Certification Expires: September 30, 2011 <br />Monitoring Requirements: Samples shall be taken twice per year, at least one month apart <br />Effluent Parameter Measurement Frequency <br />Total Suspended Solids, mg/l 2 times per year <br />Total Dissolved Solids, mg/1 2 times per year <br />pH, s.u. 2 times per year <br />Hardness, mg/l as calcium carbonate 2 times per year <br />Dissolved Oxygen, mg/l 2 times per year <br />Arsenic, ug/l, total 2 times per year <br />Radium 226+228, pCi/l, total 2 times per year <br />Uranium, ug/l, total 2 times per year <br />Uranium, ug/1, dissolved 2 times per year <br />Zinc, ug/l, dissolved 2 times per year <br />First Annual Report Due: 02/15/2010 <br />Sample Tyne <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Annual Fee: $175.00 (DO NOT PAY NOW - A prorated bill will be sent in 2-3 weeks.) <br />Page 1 of 22