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November 12, 2012 <br />i r. 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: SECOND QUARTER 2012 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 second <br />Quarter 2012 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 -3 <br />(MW -20) were collected. <br />At your request the format of the report tables have been changed from previous submittals and include a <br />summary of the results collected since September 2010 along with the benchmark levels for each well. <br />Please note benchmark 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 />ra Harkins <br />Geologist <br />Golder <br />Associates - <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 L95375 <br />1 \10 \81640 \0400 \q2 2012sampling fnl- 12novl2 \10381640 q2 2012sampling fnl- 12novl2 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 />�1- iq'n-3 <br />Project No.: 103 -81640 <br />Ed Pottorff, P.G. <br />Associate /Senior Hydrogeologist <br />RECEIVED <br />NOV 132012 <br />.,Division of Reclamation, <br />Mining & Safety <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 />