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1• <br />erember 21, 2011 <br />� Golder <br />Associates �'v- <br />)7 <br />.3n, <br />Yr <br />Du; 2011 <br />Project No.: 103 -81640 <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 />RE: THIRD 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 third <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 />Sincerely, <br />GOLflER ASSOC! i S INC. <br />1 \10181640 \0400 \q3 2011samplinq fnl- 21dec11 \10381640 q3 2011samplinq fnl- 21dec11 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 golder.com <br />rt <br />ara Harkins Ed Pottorff, P.G. <br />Geologist Associate /Senior Hydrogeologist <br />Attachments: <br />Table 1: Groundwater Results from the August 2011 Sampling Event at the Boettcher Quarry <br />Table 2: Comparison of August 2011 Concentrations to Benchmarks Levels <br />Laboratory Reports: ACZ report number L90215 <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 />