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AY 2 3 2011 <br />Mining and Safety ? <br />(Z-)Associates . 'sion of Reclamation, <br />Golder <br />74 <br />-/0- J q '7 7 3 Zg <br />May 19, 2011 <br />k. 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 />RE <br />Project No.: 103-81640 <br />FIRST QUARTER 2011 GROUNDWATER SAMPLING AT THE BOETTCHER QUARRY <br />Dear Mr. Scott, <br />On behalf of Holcim (US) Inc. Golder is pleased to submit analytical laboratory results for the first Quarter <br />2011 groundwater sampling event at the Boettcher Limestone Quarry near La Porte, Colorado. Attached <br />you will find tables summarizing the results and a copy of the laboratory report. In addition to sampling <br />wells MW-1, MW-2, MW-3 and MW-4, a field blank (MW-15) and a field duplicate at MW-1 (MW-20) were <br />collected. <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 />-1--a XZV?- <br />Sara Harkins <br />Geologist <br />Ed Pottorff, P.G. v <br />Associate/Senior Hydrogeologist <br />Attachments: <br />Table 1: Groundwater Results from the March 2011 Sampling Event at the Boettcher Quarry <br />Table 2: Comparison of March 2011 Concentrations to Benchmarks Levels <br />Laboratory Report: ACZ report # L87215 <br />i:\10\81640\0400\g12011sampling fn1-19may11\g12011sampling_cvr1lr-fn1-19may11.docx <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.goider.com <br />?V- <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