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� Golder Associates <br />May 16, 2013 <br />REC c'' M `g8ect No.: 103- 81640Y3 <br />/Mr. Eric Scott I <br />1� Colorado Division of Reclamation Mining and Safety MAY �01� <br />Department of Natural Resources <br />1313 Sherman St., Room 215 DIVISION OFRECL4M <br />Denver, ,C Colorado 80203 MININGAND&4FEri ®� <br />RE: '/FIRST QUARTER 2013 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 <br />Quarter 2013 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. <br />This sampling event is the first monitoring event for wells MW -5, MW -6, and MW -7, installed in December <br />2012. The sampling event was also the first event for the reduced analyte list approved by the Colorado <br />Division of Reclamation Mining and Safety on February 5, 2013. In addition to sampling wells MW -1 <br />through MW -7, a field duplicate at MW -1 (MW -20) and a field blank (MW -15) were collected. The <br />locations of monitoring wells MW -1 through MW -7 is presented in Figure 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 />z' �- <br />Adam Hobson <br />Senior Hydrogeologist <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 />Table 5: Summary of Monitoring Results for MW -5, MW -6, and MW -7 <br />Figure 1: Location Map <br />Laboratory Reports: ACZ report number L11197 <br />i \10\81640y3 \0100 \q1 2013 samplingres- fnl- 16may13 \10381640y3 q1 2013sampling_fnl- 16may13 docx <br />Golder Associates Inc. <br />44 Union Boulevard, Suite 300 �1 <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 />