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<br />11d Cer ll'h1L_ .u': __Ot Ji~:'is2ui7 <br />4210 East 11th Avenue <br />Denver, Celarado 80220 <br />RATIONALE <br />AMENDMENT N0. 5 <br />WESTERN FUELS - UTAH, INC. <br />PERHIT NUMBER CO-0038024 <br />RIO BLANCO COUNTY <br />FACILITY DESCRIPTION: <br />By letter of July 27, 1987, the permittee has requested an additional outfall, <br />which would be used as an alternate discharge point far mine water. The mine <br />water is currently pumped about 1.8 miles to pond PP-2 where it is commingled <br />with shop and conveyor washdown, WTP reject water and WWTF effluent. The new <br />outfall would serve as a discharge point strictly for mine water and would <br />necessitate pumping only about 0.4 mile. Settling would occur in an 8 million <br />gallon underground sump. The new outfall shall be numbered outfall 023. <br />Discharge will go to Scullion Gulch at a point approximately one half mile <br />above confluence with the White River. No livestock or wildlife typically use <br />Scullion Gulch along this stretch. Access to the majority of the gulch is <br />restricted by fencing. Sheep graze above the mine site, but not along or <br />below it. <br />m... <br />LIL LU L\1 Ll.'I11n11V1'1 L.nLlIn11V!\. <br />Scullion Gulch is part of Segment 13a of the White River Sub-basin. Segment <br />13a has no metals standards. Thus, the discharge is evaluated against the <br />next Segment (12), which is the mainstem of the White River. <br />^'!~e i-da~~. i0-~lesr 1^~.! flnc; (n-__T.,) for t?Te !'~:tit_ River is 140 cfs. The <br />r'bC ~U: .._ i:3..nCC E~CiZ:fl tE ~~.c _Glif 72[. _... ~_. iL'~! .1= L'li5 1172. <br />For a conservative approach, we will assume that the entire 79,200 gallons <br />(0.123 cfs) could be discharged in a single day. This would yield a ratio of <br />1138:1. At this hieh dilution no specific metals limitations would be <br />'; C.'. .53'? r,. t'STC ~_ a ::T ^.tif' o.7_Y..1a t.C1'S _C: 5 lE'1 ~:L.~-2~?T_ .. _..1S.i:.L- <br />[his point. Appendix B shows the results of two analyses of this water. the <br />only parameter of concern is total dissolved solids, which will be discussed <br />later. <br />