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barring other geochemical circumstances or influx of more contaminated water <br />or an influx of oxygenated water. R:00887 -888. <br />Division staff and <br />dewatering will cost five <br />action was appropriate <br />certainty that the hydra <br />Other remedies such as <br />rstood that dewatering the mine pool as a corrective <br />action is expensive (see e.g., R:01019 (where Division states Cotter has said <br />million dollars a year), but testified the corrective <br />hen compared to the costs that will be incurred if the <br />mine pool water begins seeping into Ralston Creek and Ralston Reservoir. <br />R:00890. Mr. Bird testified that requiring dewatering to 500 feet provides <br />lic gradient will be away from Ralston Creek and <br />would minimize any migration of the mine pool to the Reservoir. R:00899 -900. <br />dding monitoring wells to the Schwartz Trend area as <br />a warning system would not provide that certainty. R:01016 -1018. Mr. Bird <br />testified that remediation is required now to prevent off -site migration of the <br />mine pool water because a drinking water source is being impacted. R:01008 <br />Water Users Statements <br />May 14, 2010 Letter from Denver Water <br />On May 14, 2010, Brian Good, Director of Operations and Maintenance for <br />Denver Water, sent the Division a letter regarding Cotter's proposed April EPP. <br />Mr. Good states that Denver Water owns and operates Ralston Reservoir, which <br />is one of the primary water sources for Denver Water and its 1.3 million <br />customers. R:00357. In the letter, Mr. Good states that Ralston Reservoir is, <br />21 <br />