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February 23, 2012 <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 />Sincerely, <br />GOLDER ASSOCIATES INC. <br />ara Harkins <br />Geologist <br />Associates <br />Associates <br />\10 \81640 \0400 \q4 2011sampling_fn1- 23feb12 \10381640 q4 2011samphng fnl- 23feb12 docx <br />I J. <br />RE: FOUTH QUARTER 2011 GROUNDWATER SAMPLIAG 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 fourth <br />Quarter 2011 groundwater sampling event at the Boettcher Limestone Quarry near La Porte, 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 -15) and a field duplicate at MW -1 <br />(MW -20) were collected. <br />If you have any questions, please do not hesitate to call the undersigned at (303) 980 -0540. <br />S 1 c <br />z <br />Pottorff, P.G. <br />Associate /Senior Hydrogeologist <br />�i- l q 7c7-3 y—y <br />Project No.: 103 -81640 <br />Attachments: <br />Table 1: Groundwater Results from the November 2011 Sampling Event at the Boettcher Quarry <br />Table 2: Comparison of November 2011 Concentrations to Benchmarks Levels <br />Laboratory Reports: ACZ report number L91984 <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 />