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STATE OF COLORADO <br />• <br />DiV"[SIdN dF RECLAM,ATIdN, MlNtNG AND SAFETY <br />Deprsrtment. r>f'~`~,iurat Res+_s::ra,' <br />? 3 i 3 Sne:rrr;ar; Ss., Rrgrr 2 i !i <br />~c~nver, C:cloracio 8(310:; <br />Phone. r,3Q3; 8h6•:i `•i(~~ <br />FAX: i30:3i 8:3'1-8106 <br />1~1 Ei~~1U <br />Hate: .Tune s, 2a08 <br />From; Tont Kaidenbach <br />To: File <br />Hayden Gulch Loadout {Permit C-92-a$1) <br />Hydrolo;y° <br />Re: Ground ~''Vater Points of Compliance Determination <br />Permit Renewal R1V-a3 <br />Rule 4.US.13 requires establishment of ground water points of compliance if; in tlzc judgement of <br />the Division, the operation has the potential to negatively impact the quality of ground water for <br />which. quality standards have been established by the dater Quality C'on.trol Commission. Ground <br />water points of compliance are unwarranted at the Hayden Gulch L,oadout, as explained below. <br />I have reviewed. the need for establishing ground water points of compliance at the I-Iayden Gulch. <br />l.,vadvut. I revietived the operation's annual hydrvlugy rcpurt.s l~ro[n 1996 tluuuglt ZGU6, <br />hydrogeologic data in the permit appl.icat.ion, and. ground water ci~ell data from the Division of <br />VG'ater Resources. 'I~he following text can be inserted in the Renewal Findings document. <br />• <br />• <br />,4lluvic~l Ground i3'uter - Dry Creek alluvial Ground water i.n the area downgradie;nt from the main <br />surface disturbance oi~the loadout (the "specified area""j can bi: cla5sil.iod a5 `'l.,itl.tit~d C;~~ attd <br />Quality" based on the natural TDS concentration consistently above l (?,000 mgrl in alluvial ground <br />water well 1-IGDAI,-3. (l round water classified. as "I:imited I?se and C~uality" has limitations for <br />o>z.l.y radioactive or or~~anic pollutants. The loadout is not likely to generate significant amounts of <br />rad.ioactive:. ar organ.i.c po[lutatzts; therefore, the operation does not have the potential to negrativel.y <br />impact the quality o.f~ground water in the Dry Creak alluvium. <br />CULdKADO <br />n l v i s s c>N ~~ r <br />REC Lti~t.A"f 1 C) N <br />ttittNt.~G <br />- &.- <br />S~t.FETY <br />E4iii i~i!ter, Ir. <br />C7everr:o: <br />-iarrs E7. 5zrrrrar. <br />r.,. .. , <br />`>iviSiOn ~ired0f <br />Natural Re.=.ot;rce Trusser <br />~etlr€sck *srrttrnd 1Wrtter - Tlz.e loadc3u.t dots nc>t. h:,3ve~ th.e pc:~tential to ne~rat:i.vely impact bedrock <br />groundwater clual.ity because sny lc;aeltate origi.nati.ng from th.e loadout would lack suf~icierzt. <br />h.ydraul.ic. head to sigrsifican.tly invade the bedrock unit ttndr:Yrlying the area, the 1o~:~-permeability <br />1.:c~~~ts Sh.ale:. I !z.ls ntarine shale cc.}n.f t.tzc::~ ayUi.lc:r ar...it~, i.[I tll~; t[i1~1.~:Ca~, E.;.i.~, ,~rib_>e,t'.:.lui. ~.ri i.tuti ~-:iwit. <br />and raiser, l')9~, I-lydrol.o~~ic Setti.n.g of the Upper 1Wl~saverde Group, Sand ~,Ua$h basin in <br />Colorado Geological. Survey Resource Series 3C1, page Gi). Several htmdred feet of'Lewis Shale <br />separtite the loadc>ttt f'rc>m the deeper iWtesaverde Group. As a loadout (rather than a. min.e), the <br />operation will lz.ave no deep excava.tion.s or deep impoundnzen.ts where water could d.evel.op <br />si.gnifi.cant hydraulic head. It> addition, any leachate c}riginati.ng at the loadout would likoly bo czf <br />better qutt.lity than native 4?;rczt[nd. water itz tlzc (,ewis Shale which lzas hi~~h concentrations of.' <br />dissol~,%ed solids. <br />i;i:: 1):ir? 1~GCFYeilit~~l <br />J~uie~~rriris <br />i~Tlli:f'. r; <br />~.•~iineci Larld Keciarnaiior~ <br />Derver Grand Junct.iorz ~ [Jurtrgo <br />UiTrf_t Ot <br />AC!:ivi' rind inactive :'v4snes <br />