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DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866 -3567 <br />FAX: (303) 832 -8106 <br />February 24, 2012 <br />Ms. Gina Nance <br />GCC Rio Grande, Inc. <br />3372 Lime Rd <br />Pueblo, CO 81004 <br />Re: Red Rock Plant & Limestone Mine, Permit No. M- 2002 -004, Exceedance of Groundwater <br />Numeric Protection Levels <br />Dear Ms. Nance: <br />On February 16, 2012, the Division of Reclamation, Mining and Safety (Division) received your <br />"Second Half, 2011 Groundwater Monitoring Report". Page 3 of Table 2 in this report indicates the <br />Numeric Protection Level (NPL) for total dissolved solids (TDS) was exceeded in both MW -03 and <br />MW -04. <br />Enclosed for your reference is a copy of the December 8, 2009 letter from the Division establishing the <br />NPLs for Permit No. M- 2002 -004. The NPL for TDS was set at 2630 mg /L. The second half TDS <br />values collected on October 13, 2011 were 3060 mg/L and 2640 mg/L for MW -03 and MW -04, <br />respectively. Pursuant to the enclosed letter, TDS samples for MW -03 and MW -04 must be collected, <br />analyzed and reported in the next quarter following the October 13, 2011 samples exceeding the NPL. <br />Follow -up TDS samples are required to be obtained for MW -03 and MW -04 prior to March 31, 2012. <br />The results should be analyzed and reported to the Division within a month of their collection date so <br />the Division can determine if the sampling frequency needs to be increased to monthly basis. <br />If you have any questions, please contact me at 303 - 866 -3567 x8169. <br />Sincerely, <br />Enclosure <br />Timot y'". Cazier, P.E. <br />Environmental Protection Specialist <br />cc: Tom Kaldenbach, DRMS <br />Barbara Hodgson via email <br />STATE OF COLORADO <br />COLORADO <br />D I V I S I O N OF <br />RECLAMATION <br />MINING <br />— &— <br />SAFETY <br />John W. Htckenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta E Pineda <br />Director <br />Office of Office of <br />Mined Land Reclamation <br />Denver • Grand Junction • Durango Active and Inactive Mines <br />