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Review Checklist for Termination of Hydrologic Monitoring <br />Mine: Apex NO. 2 Mlne <br />Permit No.: C-81-011 <br />Permitting Action: TR-14 <br />Date review completed: <br />DMG reviewer: Tom Kaldenbach <br /> Demonstrat <br /> Require- ed <br />Requirement ment compliance Comment <br /> citation with ? (yes <br /> / no <br />A. Basic <br />Standards for CWQCC The sediment control pond at the Apex Mine has not discharged <br /> <br />Surface regulation yes for at least 5 years. Water impounded in the pond has not <br /> <br />Water s 3.1.11 exceeded the Basic Standards. <br />B. Instream CWQCC Historical data in Annual Hydrology Reports have shown the <br />Numeric regulation yes mine has not caused an exceedance of instream standards in <br />Standards 3.3.0 Trout Creek. <br /> Section 41.S.C.6 says the interim standard is, either, 1994 <br /> ambient quality (for which there are no data at Apex), or it is <br /> table values, whichever is less restrictive. In either case, Apex <br />C. Basic complies. Fe and Mn table values for agricultural use are <br />(Interim CWQCC commonly exceeded in upstream and downstream alluvial <br />Narrative) <br />regulation <br />es water, but are probably not caused by mining. Upstream pre- <br />Standard for <br />41.S.C.6 y mining Fe and Mn levels exceeded the agricultural table values <br />Ground as shown on pages 65.32 - 65.55 of the permit application. <br />Water Bedrock aquifers would not be expected to be contaminated by <br /> Apex (see memo dated 11/29/00 to annual hydrology report <br /> file evaluating [he mine's potential for contaminating bedrock <br /> a uifers). <br /> Surface water features in the permit area are the perennial stream, <br />D. Prevention of Trout Creek, and ephemeral drainages that extend down the <br /> northwest facing hillslope in the northern part of the permit area. <br />impacts to <br />surface water These ephemeral drainages drain to Middle Creek. They are not <br />that adversely CDMG impacted by Apex because the mine's surface disturbance is <br />impact the regulation yes limited to [he Trout Creek valley, to the south. The water in Trout <br />postmining 4.05.1(2) Creek is used a short distance downstream from the permit area <br />land use for domestic and livestock (permit page 66), but is not used within <br />within the the permit area for these purposes. Riparian habitat lines Trout <br /> Creek in the permit area. This habitat is not expected to be <br />permit area adversely impacted. <br />E. Restoration <br />of ground <br />water <br />recharge to CDMG <br />regulation <br />es The Apex No. 2 Mine did not significantly disturb the local <br /> <br />approximate <br />4.05.11(3) y rechazge area, the outcrop belt of the Iles Formation. <br />premining <br />rate <br />Page 1 <br />