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<br />Fvnoff frem disturbed drainage., at the TraFoer minesite was ccmoared to .hE
<br />natioraZ primary and a=ccndary drin.~ing water ~tardards and tY.e limits for
<br />continuously used irrica lion :cater. The TDS rnncentrat-ors 2XCaEd'ti12 secondar-•,
<br />drinking crater limits of 500 mg/I ir. mcst samples; the sulfate licit o_° 250 me,-
<br />is e;:ceeded at the upper Flume Gu_Ici~, lower Flume C'u1ch, and P!o ,`lames Gulch sites;
<br />the iron L.mit cf 0.; moil .is exceeded at ,,.._ u~~per F1mT.e Ga1c.h, lower Flume
<br />Gu=cr., Pyeatt Gulch, any `;o A'ame Gulch sites, end the .manganese limit o.`. 0.05
<br />mo/,~. i:; e:rceeded at the 'lame Gulch stations. Irriga ticn standards are exceeded
<br />for iron lln:ce= FZu.-e Guic'r, ',eatt Gulc.?, and tlo ;Jame ,ulch), sodium aPsorption
<br />ratio ;Pyeatt Gulch;, hangar._se (I~.:rer Flume Gulch), lithium (Ie:rer _'une Gulch),
<br />and r.:o'ubdenum (upper and _ower Flur.,e Gulch).
<br />Surface Wa for il.se
<br />[dater from the Yampa River 3as'n is used for irrigated crop and, municipal water
<br />suppl.es, stock ponds, coolinG water for Focrer plants, evapotranspirationny
<br />riparian vegetation and phreatophytes, and transbasin diversions. Irritation
<br />of cr~piard coax-titvtes rice lances= of these uses. Surface mater wi`_hdra'rn
<br />from ~9e Yampa Fiver vaI_ey in '4~5 totaled appro;ri.ratelp 44°,000 acre-:='et.
<br />J_` 1~rat, nearly 399,000 acre-feet erere used for irriuat:nq croplands and ?•ay
<br />;neadoH's or was stored .n stock pads. Jther uses included =,478 acre-feet -or
<br />irdvstrial purposss, x,555 acre-feet _`or municipal :rate" suFplies, and b,~L'3
<br />care-feet for other unspecified uses (Stee_'e et al., 1'J^9). I;:d~str-al ccn-
<br />• sumption .has s_nce increased bg a btal cf 1b,720 acres-feet/uear due to us= by
<br />the Craig genera i:irg station.
<br />Water _`ar arriccl`_urai irrigation is aererally obtained to simple stream diver-
<br />sion structures and nets:crrs of ditc.+tes for flocdin.7 Grasslands and me_dows
<br />dvrine the swmet months. The short grazing season nreclvdes gtcwinc of .-any'
<br />crops svc): as corn. Ir. t.`te [•1i11ia:ns Fork River, an evan 'nigher nrc_:ortier. of
<br />the water used _~ for agricultural activities.
<br />[:'ester tse on the mine-plan area has been limited to stock :raterinc frem ponds.
<br />Location of stock ponds is sho~~m on Afars 31A and 31B i,-.~ the Traeger ,~!ine pc-r-
<br />mit application.
<br />Ftobable 1lydroZoo.ic Corsecuerces - Trapper A;ine
<br />*/plume .2 of the Utah Internationsi Tra~oer ~t7ine pernzt ap,?Iication '-=lodes .3 r,
<br />~ssassment_ of Tire _r_robable hydrolcnic consequences cf sire propos:=d :r~inirc oper-
<br />a pion.
<br />Darin; mining operatioes, the v_sturted area ..i11 e::nerience a slight r"ecrease
<br />in _uroff due to losses .n the mire pit and storac_e in t`e sediment ?cods.
<br />Smaller storm =vents nigh: be totally contained. However, runoff ,.'ror snrinG
<br />sne:rmelt -rcvld fiI_ the sac'_'ma.?t Fords and d`scharge.
<br />the Trapper AIi.'7e h~~; .,~^n operating for sereral nears, an<i to to i. suspended so1_ds
<br /> Iev.=_Is otser:cd at the sa 'face :ra tar mcni torinc sites have toga s'~,r,i `icantly
<br /> hi-her t4an _he ore-m=ning menitorino. The ma:rimum r'-rnL:e concerara~:o.? at
<br />• tre `:'c .lama si`e (5--3) r>•as 230 mg,'i whip' :maximum ~.•aiue or :?0,900 roc!' :gas
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