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<br />- <br />A <br />.... <br />--J <br /> <br /> <br />COIIOCI"'9 W<l,m'ln! CO'l' samples on D,llon Rase,. <br />.-0<1 IPnolog,aph b)' Norman 5p.ohf. U 5 GeologIcal <br />S~"'ey l <br /> <br />'-linin:: :u:thitil's 11:1\(' ;tfTt'ctl'd <br />lran'-l.ll'f1H'nt l'lllll"l'nlration.. ;Iud <br />:llluatil" inH'I"tl'hrall.... in "nul'll <br />{;ukh l.lIId till' Hltll' Rht'r. Sam- <br />pk.. fnllTI Jiffert'lIlnl<..'lha \~~rc <br />U'I'J (1l1l1\'e..ug:ul' the elTeL'I.. of <br />mining ;ll'ti\ilic.. (In the W:ilt'[ yual- <br />It~ and a....()I..'ialt.J hi.)la <It In ..ilt'... <br />,lk1ng till' HILlt' Rin:r and Fre'Il.:h <br />Cillkh. a lritlulary \lltht' BIUt' RI\t'r <br />ltjg, 121. Slit"... 2 and 3 (jig, 121 are <br />l:la..:J...~ruund ..ill'... on Frellch Gulch <br />and ,1ft" 111IlljlllalJ~ atfectt'J h~ min- <br />Ing ,-ll,ti\'llit'... LUll' C\ln..:CnlraIHlll', <br />In \\all'f anLl ..lr('al11~t:'J "I'JlIIK'tH <br />;lI1J 7ltK aCL"lIIllUlak'J by alju;Hlo.: <br />1111...... .lllhe...\.' nadq!n1unJ ..ilc~ <br />\\ l'rl~ !1m l'r Ih;lIl th.)...e from ..ilL', <br />Jllwn...lrr:alll from lhe: mined <:Irt.a.... <br />TII\.' m\('r1et'1rate \..'lllnrnunity "tnl\..'- <br />turt' I a~ ITldlcatc:d by may l1y ahun- <br />J:H1\..'e anJ per\..'cm Illldge" I \, a~ <br />minimally alf('(ted at the back- <br />gwuoJ ~ite", <br />.-\lthl1ugh h<.ibll:H l"llllJilllln" <.il <br />"ite .J \\ t'rl.' Jegr:tdt'd and Lin..- \..'(\fl- <br />\..'elllr:llloO... \\t're grealer tllJ.llthl\"e <br />up"trt'.\nl. lhe il1\'t'nebr:L1c cnmlllu. <br />nlly W:I'" ont fl'llIlJ hl be ~ignin- <br /> <br />\...antly degraded. Fanh("r dml n- <br />...tream, where underground Imlle: <br />~eepage Cl\lHnbuh."- 10 ...urfa..-e run- <br />off I ~lIe bl, line C(lncentrallOn~ in <br />Ihe water. "treaml:->ed ...t"Jlmell!. and <br />:lyu:llic mos... \\ t"re high :mJ the <br />ill\'enehrate ..:ommul1itie... were <br />tkgradeJ The mO,,1 alft"clt"d ,ile <br />ah111g FrC'llch Gulch \\a..; "Itt" 7. <br />I<k.ated near lht.:' \..'ollt1uen..'e \~ ith <br />the Blut' Rl~er. <br /> <br />Sltl.' 1. up"lream fwm French <br />Gukh (11I111c Blue Rlwr. \\;1'" char- <br />a....to.:ri/,..'d hy lll\\er ,irK l.tJll...t'lltra. <br />lIOIh III water. mo,,~. alld ...eJllllt"nt <br />lhan d')\\lhlrt'all1 "iIC";. indie.Hlog <br />Ih:lI thl' Frt'lIeh Gukh ba~lll i... ...nll- <br />tril:->uling lIne III tht" Blue Ri\t"r, <br />Down...tream frlllH the: \:(1nllul'n...l' <br />01 Frel1ch Gllk'h wilh tilt' BIllt' <br />River hill' th l'ol\el'lltration" 'It' <br />"in\... III watt"r. llUO...". anJ "treamhed <br />"l"Jimcnt were higher than ha\...k- <br />grolJllll kwh hut "lightly lo\'er <br />than in French Gulch. Abu at sill' <br />S. bru\\ n tflltH liver... had the high~ <br />t'~t cIHh:entraliun... of lin.... of am <br />...ill'... ..;arnpk'd in 11ll.' S(llllh~'rn <br />K"lcky ;\!tlunlain... tl.kaclIll and <br />Slt'plwn.... I \)9S). The tl1\ l'rtl'hralt' <br />cummulllty in lht' Hille Riwr <br />du\\ n...trt"am fWlll Fren....h Gulch <br />W.b degraded I...ill' Sl, The "lIl' \...nll- <br />Jiti.m... remain mndl'r:ltcly allt'l.tl'd <br />Jown...trl'amlO Dillon Ke"ennn <br />l"ite ]()). <br />-'linin!!. al'lh itil'~ ha\l' .llll'(.kd <br />IrOln'6l'll'lIll'nl (.ulln'nlralion" in <br />Ihl' holtmll \l.diml'nl of Dilloll <br />Ih....l.nnir. Dillon Rl'...t'rYlllr \\.1'- <br />...'on...trucleJ 111 19(1J III an area WIth <br />.I l..lng hl"I\)f) (If 1l1111lllg :1':II\'lty. <br />Sour;..'l'... ,11' tra.:e t'lelllt"nr... III Dillon <br />Re'Cf\'\11r. a drinklllg-w:ller "upply <br />f,lr the cit~ of DI'Il\'t'r. are 1..1,,:ated <br />In lht' Blue River. Sn::t!-;e River. and <br />Tenlllik Creek Ba\'IIl~, Th~' re...cr- <br />hlir i, :1...cumUI:lling ..t}m~' tr:\ct" <br />l'k./llt'nt.... Fllr (',ample. It1J.J" <br />..':lkulaleJ u~lIlg ...treamlhl\\ and <br /> <br />water conce:nlrati(ln IIldil.'ale that <br />unly 37 perccllt of Ihe lIIK IhJ.1 <br />enter..; Dillon Re\'C'r\'oir ka\'e~ the <br />re...ervoir (ng. 12. lOp left graph,. <br /> <br />ScJlfficnt core" \\ e:rt' clll1el.leJ at <br />...t'\'t"ral lo....atinn" in Dillon Reser- <br />\'oir. C,IIl..'eJ1lralion" of Ie:ad and <br />llIlC ttmHlghout the core collected <br />near lh~' Jam e,""cl'eded the PEL. <br />('aJnuum. lead. :tnJ ,ilK ...-oncen- <br />lrallon"> In ~edirnellt cores fwm tht' <br />Rlue Ri\t'r. Snake Ri\'er. anJ Ten~ <br />mik Cn:e" arm... \1f tht" reservoir <br />aJ...o \\t're ahn\l' tht' PEL (\'alut":> <br />fnr nne <:Ire "huwn in the top of <br />fig. 12). <br /> <br />Alth"lllgh bnllOm ...cdlml'nt con- <br />centr.lIiun" of "ume trace elemelllS <br />e\;...et'Jl'd the PEL. l'once:ntralion" <br />IlIlhl' W<.lll'r culUl1Il1 \\ert' !lOI high <br />The l.OIh:l'ntratilln... of trace eJe~ <br />l11el1b ill the re...t'T\nir water \..'01- <br />Ullln Jid nt1tl'\l'eeJ the COIOf<iJO <br />~lIrfac~'-wall.r-411:llily itandard.... <br /> <br /> <br />~,'Tle'lICOfet'omDdIonFleservoo'IPholograptl <br />t'y Nrnmarl Spa"" us GeoIog,cal SurYl!Y) <br /> <br />;\IaJllr Findll1g~ I.' <br />