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<br />::':')j <br />;:"1., <br />.~" <br /> <br />" <br /> <br />'i.\ <br />i"1 <br />~;:~: <br /> <br />t;:- <br />\~~.A <br />.~~~ <br /> <br />,.,. <br />~~Y' <br /> <br />f.::f <br />r~j <br /> <br />.tl, <br />t..:::: <br /> <br />The Front Range uranium district affects, Ralston Creek, a tributary of Clear <br /> <br />Creek. The largest impact is from the Schwartzwalder mine. From the mine to <br />c..J' <br />~. above Ralston Reservoir, iron is in excess of water supply values. Although <br />o <br /> <br />l\J aquatic life values are exceeded by cadmium and copper, the Division of " <br /> <br />Wildlife has reported that a reproducing rainbow tro~t ,fishery exists in the <br /> <br />Creek. <br /> <br />In the Denver Metropolitan area a number of past activities have occurred <br /> <br />. <br /> <br />which may impact both surface and groundwater. Investigation of numerous <br /> <br /> <br />i} abandoned landfills is particularly warranted. Many of these landfills are <br /> <br />~tl <br /> <br />~1{J <br /> <br />found near the banks of surface waters and in the alluvium of these.waters. <br /> <br />Sixty abandoned landfills have been identified as being.of concern to surface <br /> <br />.and groundwater quality in the Metropolitan region. These are located on <br /> <br />Clear Creek, Sand Creek, the South Platte River, Bear Creek, and Cherry <br /> <br />f~:i <br />~j . Creek. The types and quantities of pollutants contributed from these <br />.'.. <br /> <br />'iltl <br />~, <br /> <br />fJd <br />{/: <br />\., <br /> <br />,~ft\ <br />,"; <br /> <br />.f)~. <br />{~~ <br /> <br />::,;..' <br /> <br />landfills are currently unknown. <br /> <br />Two landfills in the Metropolitan region have been identified as CERCLA <br /> <br />sites. The Lowry and Marshall landfills are both active facilities. <br /> <br />Groundwater contamination due to elevated levels of volatile organic compounds <br /> <br />and inorganic chemicals exists both on ~nd off site at Marshall, which is <br /> <br />located in the Boulder Creek drainage near the Town of Marshall. Remedial <br /> <br />actions for this site are being negotiated. The Lowry landfill located east <br /> <br />of Denver in the Sand Creek drainage has served as the disposal site of over <br /> <br />t;': 100 million gallons of liquid industrial wastes. These wastes have migrated <br /> <br />~., <br /> <br /> <br />to the groundwater and have been detected as far as one mile from the point of <br /> <br />disposal. Corrective actions for Lowry are currently being studied. <br /> <br />-64- <br />