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<br />-zo- <br /> <br />qi t4 respect to surface water quality, a ?ortion of the operation is required <br />to 3e ccntained within a sedimentation system. ~unoff from the mine bench <br />and the waste disposal piles will be routed through sediment ponds. These <br />areas present the greatest potential for affecting water quality because of the <br />exposure of subsurface materials and the Iv.gh level of activity associated with <br />these areas. <br />Total suspended sediment concentrations will be ati.nimized by passing water from <br />disturbed areas through sediment ponds which are designed to remove and contain <br />suspended solids. Total dissolved solids concentrations will slightly increase <br />as 3 :'eSUlt of runoff from the disturbed areas. It is felt that t_he runoff from <br />most storm events will not result in discharge from the sediment ponds <br />due to the limited catchment area involving the area of disturbance, <br />therefore will not affect the total dissolved solids concentration in the <br />receiving stream. <br />.f the operation experienced a ;torn requiring discharge from the ponds, r.4e <br />total dissolves soli as concentrat_on would be diluted by water from <br />undisturbed areas in the natural channel. The disturbed area (JS acres) accounts <br />for approximately seven-tenths of a percent of c4e drainage area (5,085 <br />acres) of :sunger Canyon. This relationship provides a rough estimate of ehe <br />extent to whi G4 dilution would occur, c-urther:nore, the disturbed area in <br />.YVnger Canyon comprises five-hundredths of one percent of the total drainage <br />area of East Sa1C Creek above toe confluence with .MVnger Canyon (67,288 acresl. <br />Further dilution would occur by the time the runoff from the disturbed area <br />• - reaches the alluvial valley floor. <br />Of the 35 acres to be disturbed by the operation, aaptoximately 3.4 acres is <br />required to be crontroZled by sedimentation ponds. The rest oz the disturbance <br />will consist of the haul road. The amount of area essentiallu removed `rpm <br />tae drainage of :longer Canyon due to containment within t::e operation's <br />sedimentation system is approximately B.4 acres. ^4is accounts for less than <br />two-tenths of a percent of drainage area of Alunger Canyon and less than two- <br />hundredths of a percent of n4e drainage area of .Bast Salt Creek. Obviously, <br />the reduction of such a small amount of the drainage area will result in an <br />insignificant reduction of sur.°ace f-'cw tributary to tre alluvial Talley door. <br />All surface runoff retained by the structures will eventually be returned to <br />the stream system. <br />:YO ground water was encountered :+i`_4ia teal seams and their associated roof <br />and door strata dvriac exploratory drilling in the .ni.ne pion area. <br />The applicant does not anti ci?ate any significant .^dne Znf_'cw which :round <br />recuire discharging of .av.ne water. ,longer Canyor. a an ephemeral stream. __ <br />This stream's f10W is not sustained by ;round water durino Zow flcw ?eriods <br />throuch sprzacs ant see?s. :` c:e :v..ae were to ex?er:ence .nine :allows, t;^e <br />'round :racer depleted iron the :_ydrelogic -cstem :+ould net ~e szctific3nt. <br />_t4ere?ore, the de?1e t:cn of ground cater ;Dili not impact .~e quant_tu c. :Dater <br />___JU C3 ry _„ t.".e ail^7i al 'Jdllay fl co r. <br />r <br />L <br />