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■ <br /> November 23,2021 EARTH ENGINEERING <br /> CONSULTANTS, LLC <br /> Asphalt Specialties, Co.,Inc. <br /> 10100 Dallas Street <br /> Henderson,Colorado 80640 <br /> Attn: Mr.David King(DavidkQasphaltspecialties.com) <br /> Re: Subsurface Exploration and Slope Stability Evaluation <br /> Stiles Mine <br /> La Salle, Colorado <br /> EEC Project No. 1212092 <br /> Mr.King: <br /> Enclosed, herein, are the results of the subsurface exploration and geotechnical engineering <br /> services completed by Earth Engineering Consultants, LLC (EEC) personnel for the referenced <br /> project. The purpose of this exploration was to develop subsurface information for stability <br /> evaluation of slopes that would develop during the open pit mining operation planned at the <br /> referenced project. This exploration and evaluation were carried out in general accordance with <br /> our proposal dated September 9,2021. <br /> Introduction <br /> We understand open-pit mining is planned on the approximate 167-acre property in La Salle, <br /> Colorado. The open pit mine would operate to obtain useable aggregates, with mining extending <br /> to depths not to exceed approximately 42 feet below ground surface.The mining operations would <br /> propose sloped cuts with the top of the cut slope maintaining a minimum setback of 50 feet from <br /> the permit boundary.Furthermore,we understand the open pit would maintain dewatering trenches <br /> within the existing cut slopes to dewater the pit and prevent water seepage into the open cut mine. <br /> EXPLORATION AND TESTING PROCEDURES <br /> To obtain information of the existing subsurface conditions,six(6)test borings extending to depths <br /> of approximately 35 to 45 feet below present site grades were advanced within the proposed <br /> mining area. The boring locations were established in the field by EEC personnel by pacing and <br /> 4396 GREENFIELD DRIVE <br /> WINDSOR, COLORADO 80550 <br /> (970) 545-3908 FAX (970) 663-0282 <br /> www.eerth-enaineerina.com <br />