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1` <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />f <br />1 <br />1 <br />Golder <br />Associates <br />October 22, 2015 <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 />to - <br />,5 <br />ver,0300t4Project No. 1520788+ <br />iotaclk <br />i <br />stow <br />RE: THIRD QUARTER 2015 GROUNDWATER SAMPLING AT THE BOETTCHER QUARRY <br />Dear Mr. Scott: <br />On behalf of Holcim (US) Inc., Golder Associates Inc. is pleased to submit analytical laboratory results for <br />the third quarter 2015 groundwater sampling event at the Boettcher Limestone Quarry near La Porte, <br />Colorado. Attached are tables summarizing the results and a copy of the laboratory report. In addition to <br />sampling wells MW -1 through MW -7, a field duplicate at MW -4 (MW -20) and a field blank (MW -15) were <br />collected. The locations of monitoring wells MW -1 through MW -7 are 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, P.G. <br />Geologist <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 <br />Table 6: Summary of Monitoring Results for MW -6 <br />Table 7: Summary of Monitoring Results for MW -7 <br />Figure 1: Location Map <br />Attachment A: ACZ Laboratory Report <br />Randy March, P.E., P.G. <br />Principal Geological Engineer <br />I \15\1520788\0110\boettchergwsamp 3g2015_fnl-22oct15\1520788 boettcherquarrygwsamp 3g2015 fnl-22oct15 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 corn <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 />