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<br />R. G. OTTO & ASSOCIATES <br />:~' <br />EXECUTIVE SUMMARY <br />A detailed survey of surface and ground wate2• <br />quality has been made to assess the impacts crf <br />sunolf or seepage from waste rock piles at tt~e <br />Cotter Corporation Schwartzwaldaz Miae on than <br />water qualitp of Ralston Creek, Jefferson County <br />Colorado. Surface water samples were collected <br />upstream and downstream o! the waste rock piles <br />and ground water samples were collected downe~lope <br />of the disposal site from September 1983 through <br />September 1984. Additional cross pile data on water <br />qualilty was obtained from other, concurrent <br />ooaitoriaq activities conducted by the Company. <br />These studies indicate that th• waste rock piles <br />have ao measurable impacts on water qualitp is <br />the stream with the possible ezceptioa of stz•eam <br />uranium levels. Differences between the uraa.ium <br />data sets preclude determination of the absence <br />of a measurable impact. However, th• uranium. <br />levels in Ralston Creek downstream of th• wane <br />rock piles are well below the Colorado tinter <br />Quality Standard. <br />q <br />~' <br />?. <br />