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<br />., <br /> <br />, <br />,; <br />! <br /> <br />the Burlington Ditch to the Big Thompson River is dominated by Denver sewage <br /> <br />~:: <br /> <br />tA) <br /><::I <br /><::I <br />C)1 <br /> <br />effluent for eight months of the year which accounts for much of theinstream <br /> <br />;:; <br /> <br />quality of the South Platte. As a result, it is difficult to account for <br /> <br />~. <br />;,';; <br /> <br />nonpoint source impacts; however, previous efforts have indicated that minor <br /> <br />impacts of urban runoff are felt in the Platte downstream of Denver for 20 <br /> <br /> <br />miles. Storm events tend to be the period of time whenurban'runoff impacts <br /> <br />~;' <br />,.... <br />,',' <br /> <br />are noted in the Platte and other urban streams. Nonpoint source loading from <br /> <br />1~/' <br /> <br />increasing urbanization may lead to future water quality problems in the <br /> <br /> <br />northern metropolitan region. Additional monitoring of these impacts is <br /> <br /> <br />necessary to accurately determine their impact on water quality. The <br /> <br />~i~ <br />'~7:j <br /> <br />community of East Lake, located in the lower reaches of Big Dry Creek, <br /> <br />.~:t~1 <br />.... <br />f~: <br /> <br />contains failing ISDS systems. Groundwater monitoring indicates nitrate <br /> <br />contamination of drinking water supplies due to these failing systems. <br /> <br />r~~ <br />>':0 <br /> <br />The Boulder Creek and st. Vrain Creek drainages originate high in the <br /> <br />~~~. <br />~:,r <br /> <br />mountains near the Continental Divide and drain areas of past mining <br /> <br />l{ <br />,{~~ <br /> <br />activities. The Gold Hill, Jamestown, Grand Island, and Caribou mining <br /> <br />districts all drain to Boulder Creek and its tributaries. Caribou Creek, from <br /> <br />..~ <br /> <br />its source to Middle Boulder Creek, exceeds the basic standards for aquatic <br /> <br />life for cadmium and lead. Gamble Gulch, a tributary of South Boulder Creek, <br /> <br />~, .., <br />'w'l <br />t&'; <br /> <br />which enters Gross Reservoir, is impacted by acid mine drainage. Gross <br /> <br />. ~,,' <br />~ <br />.f.1 <br /> <br />reservoir is a drinking water supply. The metals from inactive mines in <br /> <br />Gamble Gulch prevent the possibl1ty of a fishery in that Creek. The Perigo <br /> <br />':,~'" <br />:}:;;~. <br />"",1 <br /> <br />Mine and several tailings areas near Gamble Gulch appear to be the main <br /> <br />'''1 <br />. ~'., <br />:;':;~ <br />. ~~~J <br /> <br />sources of heavy metal loadings. <br /> <br />::V~ <br /> <br />-67- <br /> <br />f;J <br /> <br />i."~1 <br />~;~ij <br /> <br />'~'" <br />g~ <br /> <br />; <br />