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-1 l- C,']nml Cdl Pd ra.~ter C••utembcr 1G, 1?R2 Lead (Fb) commonl:; e:rceeds drl nF:`ra water, ii•:e5tocr., and aquatic Life ;cater qua!itu standards in the Yampa Riser C4elancon, 1920); increased concentration reported in nine drainage in Cols trip, ?fop tana (Van Voast, et al 1977). 'fanoanese (;dn) increased cor,centratio.n reported in ,-u;ne sncils~ water at the Edna (fine (S.koSerboe, et a_ 1979); concentrations mau increase in waters near surface mires i^ the •.:extern U.S. iEverett, 1979); e`.'luent limitations from Au1e 4.05.2(7). 'dercury (Xq) increased concentration reported in mine spoils water at the Edna :4ine (SF:ogerboe, et al., 1979); comaoniu e;;ceeds :eater qualitu standards in the 7"amoa Fiver (Steele, et al., 197.5);. may be a pol- lutant associated o-iith flu ash dis_nosal :n surface ,nines in the western U.S. (Everett, 1979). Tdol ybdenum (Mo)~ ~, increased concentration report_d in mine e_fl vent at the Empi-? Enercy Mine (Empire Energy, _'9611; naN be a po1_'utant associated with fly ash disoosal at surface ;nines .n the ::extern U.S. (Everett, 1979); change in Cu::;o ratio cocid cause :~olubae.-osis in livestocF:. Selanium (Se) increased concentration reported in spoils ::eater . at the Edna ,line (S.kogerbee, et a1., 1979); .ray be a pollutant associated with f1, ash cisoesa_' at surface mines in the ::extern D'.S. (Ere~rett, 1979); coal ccmmoni u. has a higher than average se ieni um concentration (I!„S, 1975); t.';_ most highlu seleniferous sed_'mnts i,a the U.S. ::•ere dencr'ted during the Cretaceous Period (Td,'v5, 1976), mcst coal- bearing strata in Colorado ::ere c'eposited _uring the Cretaceous Period; selenium concentra tiens in coals and associated blac.'t s;;ales are usually ~~uch higher than average (Latkrn, 1973); at a pN, of about d • (rn.~unon in Colorado coal en ;•: zon.m~n r_n), rcl eni to may be o+idi red to the sol ub!e selenn to ion (La ci:in, i 973); harmful to !i ~'ostoc.~ :.` in c::cessi ':e con- centr.~tions. 'in: (gin) increased ccnce^tration repnrted in spe_'is .ater at the Edna 'fine (Skecerboe, et ai., 1979); conc_n- trations mac,• increase in .raters „__r sur_`ace ,tines in the western i.'.S. (E~;erett, 1979); Gau to a po'_- lutant assccia ted :: z. t.h flu asp d'soosal at surface mines i:; ti:c wes tc rn U.S. (Everett, L°79!.