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• S° springs do form, their :rater qusliry wa:id to similar ~7o that r the spoil Ground caster. (The fly ash disposal plan would Prevent disposal of fly ash in potentia:'_y saturated zones in. the `il and -he fly ash _ts?lf is not e::pected to generate Ieachata.) Ground war=r seeps near the old c-m,eire snercy pit are t.`:om1hC to De mound water :oliich has flowed tnroug6 oc'e_-bu-den spoils ir. this area. The `_oral disscIved sel.d_° (TDS) conecntration cf the seeps (~ va_[.u? of 3,i?U m3/1 .ias bzen recrorded) exc°eds drinking ~.ater~ standards with values crsater thar. mast of tl:e existino oroun8 water. The:^>e ~C_° 2eveis _°rom the seeps w±=1 cror•ably decrease ro .Lavels similar to other aseii^e water ouaiitg, a process taking hundrads of tears. +"ajer ccrs G tuer.ts include ::a, rr?, NCO?, and SOq. Sulfate concantrati.cns of 5J1. and i,F.B~ --; I i[a7e b?en recorded. These exceed the secc•ndary dr nl:_ny wa tar standard cf 25+) mg/I, but this Hater is rot ^sed for drinF:ing dater. Sec•ordary drinrir.c eater sts:::?ards are for those parameters for which no toxic 1?reI has b?en identified, but may ha re other detrimental ef_'eccs when used. A1u:*in[rm is *_ne only trace m~ta1 cohi ch has measurable ce.^.centrationa in t5e t:ac seeps, vi th vaiuPS of i,? and 39 ng/1. 7alues cf p6' were 6. d5 and ?.9. Pos*-mining g-ound r:at_°r qualltu on nee spoils and in tits sprints ::i1Z not be ade.^vaY,e for dr_nking +~%a-er pur- +aoses, a5 some of the pre-minirc .rater quali`y is not adenuate. The ,ros.- mining ground waiver qua Iitc should be suitabl? fet livestock and :riidlifa wa terint. Cumuli t've Fludroloaic Asses ~~ment • T.7e Trapper ,~;i re :/as included in a cus:ula ti ve hydrolocic ass.=ssmf.rtr of coal mining in the k'ampa River basin pr?par_d by Famsn Temco, Tn-otpcratad (5~shep, et aI. 1~B<1. ThE goat cf that study was to predict total d.issoived solids cn.centrat_'o-s at discrete points a~cny the Yampa 3iver, TrC+7t Cree.t, and Fish Creek. The Daman Tempo study worF:ed primarily fr•;m the stat.•m?nts of probatla hudroiogic consequences and ether infon-ration conta._n=d in the per- mit apr.iicaricns fur mines within the ~"aml,a Fivrar draint-g?. The assessmen` incorporated both :; urface ws tr~r and around wa rer effects in predicti ng TDS concentrations. I'n addition, the predictions were made for both aveta.;e f1cr and _'ow f_ow condit_'ors considering short-term a;.d lora-form e.`fects. Sur- _`ace water effects assessed for the .rapper Kline included sediment por.3 dis- charge and the forma *_ion of sprints in the loos t-mining topoc;-a ~~L:v. The resul~s of the assessment (Tame S1 indicate `hat from a c[;nulativ~ stand- point, coal nininc oparat.cns ie the basin will have a ne9iigihie imcacr_ on the _°ampa River duri,^g ave^age flow co~~ditions, but that r.nic~ably ?1~=vated TLS corcen tra t-:ors 'nay crcur in one <aripa k`_ver dur_nq 1o[~r .`_'.ow cendi ti ons. In the 'lamps River during soma ryariods of ie[v flow, cumulat`re mining effects may affec' water use. The elevated TGS levels would ps_.odicalL; ezc^ed the -ecommended 1eve.'.s for .muci ci pal use by a considerable ~a rai n. During t%-~ law flow c•ondi flops :+here ma ;or increases :.~ TDS occur, a h_c:n sa;-r.. tr :~acard is ooss,:bl? relative to irricat_:on water use. .YCwever, _c should be e.-chasiced that dur_rq sverac= fGCw condi.tior.8, sho~~n in Tahla 8 0_` the .:=man Tempo studs (t;isnon, et ai., 1?.92), the _=_mpa 3i•.er remains ~,= a Kith m:aiitu • .SU_t~bl6 .`cr r„anicipai use and irrigation ,+se.