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o - Golder <br />Associates <br />January 23, 2013 <br />R EIVED <br />JAN 2 4 2013 <br />DIVISION OF u RECLogioN <br />RE: FOURTH QUARTER 2012 GROUNDWATER SAM qOETTCHER QUARRY <br />Mr. Eric Scott <br />/ Colorado Division of Reclamation Mining and Safety <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Dear Mr. Scott, <br />On behalf of Holcim (US) Inc., Golder is pleased to submit analytical laboratory results for the fourth <br />Quarter 2012 groundwater sampling event at the Boettcher Limestone Quarry near Laporte, Colorado. <br />Attached you will find tables summarizing the results and a copy of the laboratory report. In addition to <br />sampling wells MW -1, MW -2, MW -3 and MW -4, a field blank (MW -99), a field duplicate at MW -1 (MW -15) <br />and a field blank (MW -20) were collected. <br />At your request the format of the report tables includes a summary of the results collected since <br />September 2010 along with the benchmark levels for each well, as applicable. Please note benchmark <br />levels were not developed for upgradient well MW -1. <br />If you have any questions, please do not hesitate to call the undersigned at (303) 980 -0540. <br />Sincerely, <br />GOLDER ASSOCIATES INC. <br />Sara Harkins <br />Geologist <br />Attachments: <br />Table 1: Summary of Monitoring Results for MW -1 <br />Table 2: Summary of Monitoring Results for MW -2 <br />Table 3: Summary of Monitoring Results for MW -3 <br />Table 4: Summary of Monitoring Results for MW -4 <br />Laboratory Reports: ACZ Report Number L97854 <br />\10 \81640 \0100 \q4 2012 sampling fnl- 23jan12 \10381640 q4 2012sampling fnl- 23jan13 docx <br />Ed Pottorff, P.G. <br />Associate /Senior Hydrogeologist <br />Golder Associates Inc. <br />44 Union Boulevard, Suite 300 <br />Lakewood, CO 80228 USA <br />Tel (303) 980 -0540 Fax (303) 985 -2080 www golder com <br />Golder Associates: Operations in Africa, Asia, Australasia, Europe, North America and South America <br />Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporation <br />°m -X 97'7 -3L/g <br />Project No. 103 -81640 <br />