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Permanent Impoundment Checklist Impoundment: Pond F Mine: Marr Mine Date review completed: April 10, 2007 ~I~ Permit No.: C-80-006 CDMG reviewer: Tom Kaldenbach Document where demonstration is located: TR-22 Submittal Intended use of impoundment: Livestock and wildlife water supply Demonstrations required by Section 4.05.9 (13) Demonstra -tiou adequate ? es / No Comment Pond F collects runoff from surrounding reclaimed and undisturbed lands. This runoff can be expected to be alkaline, as native topsoil has been replaced on most of the mined areas. Pond F is on Segment 4 of the North Platte River system. The pond discharges to Bush Draw, a tributary of the Canadian River which flows to the North Platte River. Flows in Bush Draw and the Canadian River are ephemeral, flowing only during periods of significant snowmelt or rain. The discharge monitoring data from Pond F (station 321) has been reported in AHRs for more than 10 years and indicates water in the (a) The quality of the impounded water shall be pond has been suitable for the intended use of suitable on a permanent basis for its intended livestock and wildlife watering. Discharges use, and discharge of water from the have been alkaline, having low TDS, TSS, impoundment shall meet applicable State and Yes and iron content. Livestock and wildlife have Federal water quality standards and shall not used the pond without incident for several degrade the quality of receiving water below years. Pond F discharges are subject to the applicable stream standards; quality limitations of EPA's regulation 40 CFR, Part 34 for total iron, pH, and TSS. These limitations were included in Pond F's CDPS discharge permit, which has been terminated by CWQCD. Dischazges from Pond F have not exceeded CDPS discharge limitations for several years. This long history of compliance indicates discharges from the pond will not cause exceedances of those stream standards for which discharges from Pond F have a reasonable potential of contributing to an exceedance (according to the CDPS discharge permit limitations those standards are: pH, TSS, total recoverable iron, settleable solids, and oil and rease). (b) The level of water shall be sufficiently stable The amount of water impounded each spring and the configuration of the pond shall be Yes usually is sufficient for livestock watering for adequate to support the intended use; 1 or 2 months.