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CWQCCR 31.11 <br />Basic standazds for surface water are defined in this regulation. <br />CWQCCR 33.0 <br />Classifications and numeric standards for the Colorado River Basin aze in this regulation. The <br />classification of the reach of Trout Creek contiguous to the Edna permit area is aquatic life cold <br />1, recreation la, agriculture, and water supply June through February. There is no indication in <br />monitoring data in the Edna Mine AHR that indicates that the mine's dischazges caused <br />exceedances of instream standazds in the stream segment. The sulfate standazd is 250 mg/1, <br />unless there is a specific application. The sulfate criteria are WS, water supply, from June <br />through February. The WS standazd is the water quality as of January 1, 2000. However, there <br />is no water supply use, and, thus in tum, no numeric sulfate standazd. Other constituents <br />monitored were below the criteria. This stream segment is not now "use protected", thus <br />antidegredation allowances do not apply. <br />CWQCCR 41 <br />Basic standazds for ground water are contained in this regulation. Basic standards for ground <br />water have not been described in the PAP. In this review, three specified azeas aze recognized. <br />One is the alluvium of Trout Creek subject to impact from Edna mining activity [hydrologically <br />down-gradient of mining activity and east (Trout Creek is a hydrologic barrier to east-west <br />migration of alluvial groundwater) of Trout Creek], a second is the backfill (spoil) azea of the <br />open-pit operation, and a third the Trout Creek Sandstone within a mile, hydrologically down- <br />dip, of the mining operation. <br />There are seven wells registered with the State engineer in or neaz these specified areas. <br />Well Permit Use Location Comments <br />Number <br /> <br />none other SENESec13T4NR86W appeazs to be the spoil spring monitoring <br /> well WR-1 <br />70038 household NESWSec14T4NR86W alluvial, appeazs to be out of specified <br /> areas, west of Trout Creek and above TR <br /> 1.5 <br />105783 domestic SWSESec14T4NR86W alluvial, appears to be out of the specified <br /> azeas, above TR 1.5 <br />165662 domestic SESWSec14T4NR86W alluvial, appears to be out of specified <br /> azeas, west of Trout Creek and above TR <br /> 1.5 <br />209186 domestic, SWNESec14T4NR86W alluvial, appeazs to be out of specified <br /> household area, west of Trout Creek and above TR <br /> 1.5 <br />Page 7 <br />