Laserfiche WebLink
dischazge into Segment 13c (Trout Creek above Fish Creek) in CWQCC's Region 12 of the Yampa River basin <br />(Trout Creek). <br />CWQCCR 31.11 <br />Basic standards for surface water are defined in this regulation. <br />CWQCCR 33.0 <br />Classifications and numeric standards for the Colorado River Basin are in this regulation. The classification of the <br />reach of Trout Creek contiguous to the Edna permit area is aquatic life cold 1, recreation 1 a, agriculture, and water <br />supply June through February. There is no indication in monitoring data in the Edna Mine AHR that indicates that <br />the mine's discharges caused exceedances of instream standards in the stream segment. The sulfate standard is 250 <br />mg/l, unless there is a specific application. The sulfate criteria are WS, water supply, from June through February. <br />The WS standazd is the water quality as of January 1, 2000. However, there is no water supply use, and, thus in <br />turn, no numeric sulfate standard. Other constituents monitored were below the criteria. This stream segment is not <br />now "use protected", thus antidegredation allowances do not apply. <br />CWQCCR 41 <br />Basic standards for ground water aze contained in this regulation. Basic standards for ground water have not been <br />described in the PAP. In this review, three specified azeas are recognized. One is the alluvium of Trout Creek subject <br />to impact from Edna mining activity [hydrologically down-gradient of mining activity and east (Trout Creek is a <br />hydrologic barrier to east-west migration of alluvial groundwater) of Trout Creek], a second is the backfill (spoil) <br />area of the open-pit operation, and a third the Trout Creek Sandstone within a mile, hydrologically down-dip, of the <br />mining operation. <br />There aze seven wells registered with the State engineer in or near these specified areas. <br />Well Permit Use Location Comments <br />Number <br /> <br />none other SENESec13T4NR86W a eazs to be the s oils rin monitorin well WR-1 <br />70038 household NESWSec14T4NR86W alluvial, appears to be out of specified areas, west of <br /> Trout Creek and above TR 1.5 <br />105783 domestic SWSESec14T4NR86W alluvial, appears to be out of the specified areas, above <br /> TR 1.5 <br />165662 domestic SESWSec14T4NR86W alluvial, appears to be out of specified areas, west of <br /> Trout Creek and above TR 1.5 <br />209186 domestic, SWNESec14T4NR86W alluvial, appeazs to be out of specified area, west of Trout <br /> household Creek and above TR 1.5 <br />63790 domestic NENESec25T5NR86W alluvial, appears to be out of specified azea, west of Trout <br /> Creek, 1.5 mile below minin activi <br />84697 domestic SENWSec36T5NR86W bedrock, appeazs to be the Trout Creek Sandstone <br /> monitorin well TCS-1 <br />There are no known domestic or agricultural uses of groundwater from the Trout Creek alluvial or spoil aquifer <br />specified areas. The use of shallow wells developed in backfill spoil azeas would be of limited value due to the small <br />quantities of water available within this spoil aquifer. By observed values of spoil spring and alluvial water quality, a <br />Page 6 <br />