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lib <br /> EARTH ENGINEERING <br /> CONSULTANTS, LLC <br /> June 28,2022 <br /> Holcim <br /> 1687 Cole Boulevard, Suite 300 <br /> Golden, Colorado 80401 <br /> Attn: Mr. Paul Conrad(paul.conrad(j�holcim.com) <br /> Re: Subsurface Exploration and Slope Stability Evaluation- Supplemental Report#2 <br /> Irwin/Thomas Properties <br /> Longmont, Colorado <br /> EEC Project No. 1172053 <br /> Mr. Conrad: <br /> As requested, Earth Engineering Consultants, LLC (EEC) submitted to your attention a report <br /> (EEC project number 1172053, dated February 7, 2018) which provided the results of a <br /> subsurface exploration and slope stability analysis of slopes that may develop as part of the open <br /> pit mining operation planned at the referenced site (February 7 Report). At this time, we have <br /> been requested to provide a response to your request for information you submitted to our <br /> attention (via email) on April 13, 2022. Outlined below is the submitted requests for information, <br /> followed by our responses.Note the submitted question may be rephrased for clarity. <br /> Question 1: At the time the February 7 Report was prepared, the Pre-Mining Map prepared <br /> by Blue Earth Solution, dated September 2016, indicated a mining boundary setback from <br /> permit boundary along Ken Pratte Boulevard of at least 200 feet. A current Pre-Mining <br /> Map prepared by TST, dated March 2022, indicates that setback of at least 100 feet. Is the <br /> referenced minimum 100-foot setback acceptable to maintain the required the minimum <br /> factor of safety? <br /> 4396 GREENFIELD DRIVE <br /> WINDSOR, COLORADO 80550 <br /> (970) 545-3908 FAX (970) 663-0282 <br /> www.earth-enoineenng com <br />