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CWQCCR 31 Basic standazds and methodologies for surface water are defined in Colorado Water Quality Control Commission (CWQCC) Regulation (CWQCCR) 31. Surface runoff and spoil leachate from mined areas at the Edna mine discharge into Segment 13c (Trout Creek above Fish Creek) in CWQCC's Region 12 of the Yampa River basin (Trout Creek). CWQCCR 31.11 Basic standazds for surface water aze defined in this regulation. CWQCCR 33.0 Classifications and numeric standards for the Colorado River Basin aze in this regulation. The classification of the reach of Trout Creek contiguous to the Edna permit azea is aquatic life cold 1, recreation la, agriculture, and water supply June through February. There is no indication in monitoring data in the Edna Mine AHR that indicates that the mine's discharges caused exceedances of instream standards in the stream segment. The sulfate standazd is 250 mg/l, unless there is a specific application. The sulfate criteria are WS, water supply, from June through Febrtary. The WS standazd is the water quality as of January 1, 2000. However, there is no water supply use, and, thus in turn, no numeric sulfate standazd. Other constituents monitored were below the criteria. This stream segment is not now "use protected", thus antidegredation allowances do not apply. CWQCCR 41 The Edna mine groundwater discharges aze not from a "new" (since January 31, 1994) source. Underground mining was underway in the Edna Mine azea in the early 1930's. Surface mining at Edna began in the late 1940's. ~ Coal extraction from the Moffat azea of the permit, the last section of the permit area to be mined, was started before 1994, and mining operations were suspended in 1994. Only reclamation activities continued after that time.Z In accordance with CWQCC Regulation 41.5(C)(6)(b)(i), the Division finds the mine in compliance with the Basic Standards for Ground Water when TR-3 is considered a point of compliance. This finding is made by comparing water quality data reported for TR-3 with the ambient quality in accordance with CWQCC Regulation 41.5(C)(6)(b)(ii). Colorado Discharge Permit System Dischazges at the Edna mine are regulated by the Colorado Discharge Permit System permit number CO-0032638. Information on applicable monitoring is included in this report by reference (Dischazge Monitoring Reports aze provided to the Division under sepazate cover}. No discharges exceeded permit criteria during water yeaz 2006. ~ PAP page 3.1-I a Annual Reclamation Reports for 1994, 1995, and 1996 Page 7