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<br />Upper Colorado River Basin <br /> <br /> <br />Dillon Reservoir <br /> <br />30,000 <br />zO: <br />-<( <br />ci~ <br /><5ffi <br />-'lL <br />~ (/) 15,000 <br />N~ <br />-'0: <br />i=!Cl <br />00 <br />f--' <br />;;:: <br /> <br />WATER YEAR 1998 <br /> <br />r-: ~ Dillon Reservoir <br />6 aJ ffi 3,000 <br />~~ffi <br />goWlL2000 <br />zoom' <br />wo::;; <br />00<( <br />66: ffi 1,000 <br />OWO <br />~ffJ~ <br />N~~ 0 <br />-~ <br /> <br /> <br /> PEL is 315 <br />:;; :;; :;; micrograms <br />0: 0: 0: per gram <br /><( <( <( <br />0: 0: " <br />W W W <br />> > W <br />ii: ii: 0: <br />0 <br />W W W <br />:J " -' <br />-' <( ~ <br />m z <br /> (/) z <br /> W <br /> f- <br /> <br /> <br />Study Area <br /> <br /> <br />o <br />INCOMING OUTGOING <br />LOAD LOAD <br /> <br />EXPLANATION <br /> <br />9.l-=H. . Sampling site with site number and <br />.t:tj site condition ran kings <br /> <br />Dissolved zinc in water rn Habitat score <br />Zinc in streambed sediment '.. Mayfly ab~ndance <br />Zinc in aquatic moss Percent midges <br /> <br />. Significantly affected or higher concentrations <br />o Moderately affected or mid-range concentrations <br />o Minimally affected or lower concentrations <br /> <br />X' Mine location <br /> <br />o <br />I <br />o <br /> <br />I <br />2 KILOMETERS <br /> <br />2 MILES <br />I <br /> <br />~- <br /> <br /> <br />\ <br />- ~. 6 Wellingtonc__ Wirepatch <br />/ 7. ~ oroMlne. Mine <br />, ..X' 4 3 X' <br />1. 13-~~ <br />Breckenndgj ~~ 5 2oun~ry Boy 2 <br />~ Mine <br />/- ~ <br />F~ II <br /> <br /> <br /> <br />Figure 12. Different types of sampling media provide a better understanding of conditions at sites sampled in the Blue <br />River Basin, Dillon Reservoir sediments are accumulating some trace elements originating from mining areas. <br /> <br />14 Water Quality in the Upper Colorado River Basin <br />