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<br />" <br /> <br />Several miles upstream of Chatfield Reservoir is the Martin Marietta CERCLA <br /> <br />t\) <br />CJ:> <br /><P <br />C)1 <br /> <br />(Comprehensive Environmental Response, Compensation, and Liability Act) site. <br /> <br /> <br />'Groundwater has been impacted by past disposal of hazardous wastes at the <br /> <br />site. Organic and metallic substances have been detected in groundwater <br /> <br />adjacent to the inactive disposal site. The Kassler treatment plant, operated <br /> <br />by the City and County of Denver, has detected contaminants in their water <br /> <br />sources, which may result from the site. <br /> <br />~' <br />J; <br />.. {' <br /> <br />Downstream of Chatfield Reservoir cadmium, copper, and lead derived from <br /> <br />, <br />!' <br />w: <br /> <br />upstream sources slightly exceed basic standards, however concentrations are <br /> <br />less than upstream and do not appear to impact classified uses. As the South <br /> <br />r~ <br /> <br />Platte moves through Denver Metropolitan region it is affected by urban runoff <br /> <br />!~ <br />"l( <br /> <br />and sewage discharges. Urban runoff is particularly a concern during storm <br /> <br />r <br />>~ <br />~. <br />L)'. <br />".~. <br /> <br />events. During these events, dissolved metals, bacteria, and sediment are the <br /> <br />t'~,' <br />~:/ <br />e" <br />;:~ <br /> <br />pollutants of concern, according to the National Urban Runoff Program (NURP) <br /> <br />study. Below Bowles Avenue to the Burlington ditch diversion, the <br /> <br />~~ <br /> <br />concentration of sediment, phosphorus,and nitrates increase. <br /> <br />:r~ <br /> <br />Bear Creek enters the South Platte along this segment with minor suspended <br /> <br />sediment and phosphorus problems. The Jefferson County Soil Conservation <br /> <br />t~ <br /> <br />District has identified streambank erosion problems in the Bear Creek <br /> <br />"t: <br />~'n":' <br />,." <br />:,\i\. <br /> <br />tributaries of Troublesome Gulch, Coal Creek, Turkey Creek, and Mt. Vernon <br /> <br />Creek which may lead not only to these problems, but also to eutrophication in <br /> <br />',".. <br />t:~~; <br />tJi:':!. <br /> <br />~~f~' <br />::~:; <br /> <br />.";., <br /> <br />r':! <br /> <br />-57- <br /> <br />l..;' <br /> <br /><<", <br />...~;~ <br />it-?~ , <br />