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<br />'j <br />1', ;~b' <br /> <br />~J <br />...., <br />.~.: <br />iJI <br /> <br />}~;~, <br /> <br />~~~. <br />~:;:i <br />\. <br /> <br />~;l <br /> <br />.~.. <br />!MI! <br /> <br />,f~~\ <br /> <br />.:~,:",. <br /> <br />:'A <br />t.'.~~ <br /> <br /> <br />l~l <br /> <br />1.':0", <br />1"',"_, <br />'.-.-, <br />" , <br />, .~ <br /> <br />t;.:_~ <br /> <br />'::',-' <br />~'...' <br />:;~ <br /> <br /><.j <br /> <br />,:.1 <br />'$ <br /> <br /> <br />.027 mg/l phosphorus was established by the Water Quality Control Commission <br /> <br /> <br />~ to protect recreational benefits. A water quality management study is <br />~,Q <br />~.:l currently underway for Chatfield to determine strategies for controlling point <br />,,",, <br /> <br />and nonpoint source phosphorus. <br /> <br />N~npoint phosphorus sources comprised 22.percent of the total loading in <br /> <br />Chatfield for 1985. Modeling efforts predict anonpoint contribution increase <br /> <br />to 49 percent by the year 2010. This would make nonpoint sources the largest <br /> <br />contributor of phosphorus to Chatfield Reservoir. If no nonpoint controls are <br /> <br />implemented in the basin, the in-reservoir phosphorus standard could be <br /> <br />violated by the year 2000. This modeling indicates nonpoint controls will be <br /> <br />critical in relation to phosphorus management in Chatfield Reservoir. ,Various <br /> <br />levels of nonpoint phosphorus removal were modeled in order to evaluate <br /> <br />control measu~es which would be necessary to protect the in-lake phosphorus <br /> <br />standard. A 50 percent removal of nonpoint sources by 2010 and all <br /> <br />dischargers treating effluent phosphorus to 0.2 mg/l could reduce <br /> <br />phosphorus loading to 32 percent. The corresponding in-reservoir phosphorus <br /> <br />concentration would allow the standard of .027mg/l to be met. <br /> <br />Molycorp, a rare earth processing facility, located in the Plum Creek drainage <br /> <br />upstream of Chatfield Reservoir, has detected high nitrates in the groundwater <br /> <br />downgradient of a storage facility on their property. Monitored <br /> <br />concentrations of nitrate in surface waters downstream of the site also <br /> <br />increase. Some means of control of this source of nitrate, through either <br /> <br />point or nonpoint source authorities should be investigated. <br /> <br />-56- <br />