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Golder <br />Associates <br />December 23, 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 />Recovea <br />DEC 2 9 ?g1W <br />DMS <br />MINING AND <br />Project No. 1520788 <br />RE: FOURTH 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 fourth 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 -5 (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 />Sra 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 />yr) Q +4-- <br />• <br />Randy March, P.E., P.G. <br />Principal Geological Engineer <br />\15\1520788\0110\boettchergwsamp_4g2015_fnl-23decl5\1520788 boettcherquarrygwsamp 4g2015_fnl-23dec15.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 />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 />