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DENVER WATER <br />1600 %Vest 12th Axenue • Denver, Colorado 80204 -3.112 <br />Phone 301- 628 -6000 • Fax No. 303- 628 -6199 • demenxafer.org <br />SENT VIA U.S. MAIL & E -MAIL <br />Ms. Loretta Pineda, Director <br />Division of Reclamation, Mining & Safety <br />1313 Sherman Street <br />Room 215 <br />Denver, Colorado 80203 <br />June 20, 2012 <br />Re: Permit No. M -1977 -300 — Application for Amendment 4 to Mine Permit <br />Denver Water Comments <br />Dear Ms. Pineda: <br />On behalf of Denver Water, I am writing to provide you with Denver Water's comments on <br />Cotter Corporation's ( "Cotter ") Application for Amendment 4 to Mine Permit M- 1977 -300 dated May 1, <br />2012. <br />Denver Water owns Ralston Reservoir, an on- channel terminal drinking water reservoir, located <br />approximately 1.6 miles downstream of the Schwartzwalder Mine. Denver Water relies on Ralston <br />Reservoir as a primary drinking water source for its 1.3 million customers. The source of water for <br />Ralston Reservoir includes water diverted through Denver Water's Moffat Tunnel Collection System, <br />South Boulder Creek, and Ralston Creek. Water stored in Ralston Reservoir is conveyed to the Moffat <br />Water Treatment Plant for treatment and distribution to Denver Water's potable water customers. Water <br />stored in Ralston Reservoir is also withdrawn directly by the City of Arvada and North Table Mountain <br />Water and Sanitation District. <br />Denver Water also owns and operates the Long Lakes ditch and headgate and Upper and Lower <br />Long Lake Reservoirs, which are used to irrigate nearby sports fields. The source of water for Upper and <br />Lower Long Lake Reservoirs is Ralston Creek. <br />Page 1 of 3 <br />Denver Water Comments/Schwartzwalder Mine Permit - Amendment 4 <br />RECEIVED <br />JUN 202012 <br />Division of Reclamation, <br />Mining & Safety <br />11 <br />CONSERVE <br />