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(BbGolder <br /> -IiAssociates <br /> December 14, 2016 GvEIVE t No. 1547675 <br /> Gv <br /> f <br /> Mr. Eric Scott <br /> Colorado Division of Reclamation Mining and Safety DEC 16 2016 <br /> Department of Natural Resources <br /> 1313 Sherman St., Room 215 DIVISION OF RECLAMATION <br /> Denver, Colorado 80203 MININGAND SAFETY <br /> RE: FOURTH QUARTER 2016 GROUNDWATER SAMPLING AT THE BOETTCHER QUARRY <br /> Dear Mr. Scott: — t 4 77 <br /> On behalf of Holcim (US) Inc., Golder Associates Inc. is pleased to submit analytical laboratory results for <br /> the fourth quarter 2016 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-2 (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 /> 4 <br /> GOLDER ASSOCIATES INC. <br /> 4�aHar kins, .G. Randy March, P.E., P.G. <br /> Geologist Principal Geological Engineer <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 /> i\15\1547675\0110\4thg2016 gwsampling-boettcher fnl-14dec16\1547675 boettcherquarrygwsamp4g2016_fnl-14dec16 docxl\15\1547675\0110\4thg2016 gwsampling- <br /> boettcher_fnl-14dec16\1547675 boettcherquarrygwsamp4g2016 fnl-14dec16 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 /> i <br /> Golder,Golder Associates and the GA globe design are trademarks of Golder Associates Corporation <br />