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m 1a"i1-30o <br />D ENVEZ WATEI <br />1600 West 12th Avenue - Denver, Colorado 80204-3412 <br />Phone 303-628-6000 - Fax No. 303-628-6199 - denverwater.org <br />August 20, 2010 <br />RECEIVED <br />Ms. Janet Kieler <br />Colorado Department of Public Health and Environment AUG 2 4 2010 <br />WQCD-CAS-62 Division of Rectarriation, <br />Alining and Safety <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80246-2530 <br />Re: Public Notice No. CO-07-10- Permit No. 000001244, Cotter Corporation, <br />Schwartzwalder Mine WWTF <br />Dear Ms. Kieler: <br />The City and County of Denver, acting by and through its Board of Water <br />Commissioners ("Denver Water") submits the following comments for your consideration <br />with regard to the Public Notice No. CO-07-10 Permit No. CO-0001244, Cotter Corporation, <br />Schwartzwalder Mine WWTF. <br />Denver Water owns and operates Ralston Reservoir on Ralston Creek downstream <br />from the Schwartzwalder Mine. Ralston Reservoir provides a direct, piped feed to Denver <br />Water's Moffat Water Treatment Plant, and is one of the primary sources of water for <br />Denver Water and its 1.3 million customers. Ralston Reservoir is also the location from <br />which Denver Water makes raw-water deliveries to the City of Arvada and to the North <br />Table Mountain Water and Sanitation District. Ralston Creek is also the source of water <br />used for irrigation with diversions occurring at the headgate of the Long Lake Feeder Ditch <br />and with deliveries through Upper and Lower Long Lakes and terminating in Vern Lake at <br />the City of Arvada's Long Lake Ranch Park. <br />CONSERVE