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Basic standazds and methodologies for surface water are defined in Colorado Water Quality <br />Control Commission (CWQCC) Regulation (CWQCCR) 31. Surface runoff and spoil leachate <br />from mined areas at the Edna mine discharge into Segment 13c (Trout Creek above Fish Creek) <br />in CWQCC's Region 12 of the Yampa River basin (Trout Creek). <br />CWQCCR 31.11 <br />Basic standards for surface water aze defined in this regulation. <br />CWQCCR 33.0 <br />Classifications and numeric standazds for the Colorado River Basin are in this regulation. The <br />classification of the reach of Trout Creek contiguous to the Edna permit azea 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 discharges c;aused <br />exceedances of instream standards in the stream segment. The sulfate standard is 250 mg/1, <br />unless [here is a specific application. The sulfate criteria are WS, water supply, from June <br />through February. The WS standard is the water quality as of January 1, 2000. However, there <br />is no water supply use, and, thus in turn, 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 standards for ground water aze contained in this regulation. Basic standard:; for ground <br />water have not been described in the PAP. In this review, three specified azeas are 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) area 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 aze 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, appears to be out of specified <br /> areas, west of Trout Creek and above TR <br /> 1.5 <br />105783 domestic SWSESec14T4NR86W alluvial, appeazs to be out of the specified <br /> areas, above TR 1.5 <br />165662 domestic SESWSec14T4NR86W alluvial, a eazs to be out of s ecified <br />Page 7 <br />