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Summary of Review of Annual Hydrology Report <br />Mine: Keenesburg Mine Date of review: March 11, 2011 <br />Permit No.: C-1981-028 DRMS reviewer: Rob Zuber <br />Report Year: 2010 <br />Submitted by: Coors Energy Company <br />Date received <br />by Division: February 28, 2011 <br /> Require- <br /> <br />Requirement Requirement <br />citation ment <br />complied <br />Comment <br /> with? <br /> (yes / no) <br />A. Filing frequency CDRMS <br />of hydrology regulation yes <br />report 4.05.13(4)(c) <br /> End of <br /> February <br />B. Timely filing of (page 117 of <br />hydrology report permit yes <br /> application <br /> C-81-028 <br />C. Filing frequency <br />of NPDES <br />Discharge n/a <br />Monitoring <br />Reports <br />D. Timely filing of <br />Discharge <br />Monitoring n/a <br />Reports <br /> The Keenesburg Mine does not discharge surface waters <br /> beyond its boundaries and, therefore, has not caused <br />E. NPDES discharge <br />n/a exceedances of instream numeric standards in the South <br />limitations Platte River basin. The Colorado Water Quality Control <br /> Division terminated the mine's NPDES discharge permit in <br /> 1997 after finding that no surface discharges from the site <br /> <br />F. Basic Standards CWQCC are likely. <br /> <br />for Surface Water regulations yes <br /> 3.1.11 <br />G. Instream Numeric CWQCC <br />Standards regulation yes <br /> 3.3.0 <br />H. Antidegradation CWCC <br />Rule for Surface regulations yes <br />Water 3.1.9(2) and <br /> 3.3.0. <br />I. Sampling <br />frequency at <br />n/a There have been no discharges of surface water from the <br />surface water site for several years. <br />monitoring sites <br />Page 1