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Earth Engineering Consultants,LLC <br /> EEC Project No. 1212092 <br /> November 23,2021 <br /> Page 3 <br /> the Unified Soil Classification System is indicated on the boring logs and a brief description of <br /> that classification system is included with this report. Classification of the bedrock was based on <br /> visual and tactual observation of disturbed samples and auger cuttings. Coring and/or petrographic <br /> analysis may reveal other rock types. <br /> SITE AND SUBSURFACE CONDITIONS <br /> The Stiles Mine property includes an area of approximately 167 acres which extends north of Road <br /> 394 near the intersection of Road 35 which is about 1 mile southwest of the town of La Salle. The <br /> property was relatively flat with apparent surface drainage to the northeast(South Platte River)at <br /> slopes of less than about 1%. Within the permit boundary,the site was vacant land. Outside of the <br /> permit boundary, prior construction observed included multiple homesteads/farmsteads on the <br /> south side of the site,a possible oil/gas facility on the north side of the site, and an area near the <br /> center of the site with unknown surface improvements/dwellings. <br /> EEC personnel were on site during the drilling operations to evaluate the subsurface conditions <br /> encountered and direct the drilling activities.Field logs prepared by EEC site personnel were based <br /> on visual and tactual observation of auger cuttings and disturbed samples.The boring logs included <br /> with this report may contain modifications to the field logs based on results of laboratory testing <br /> and engineering evaluation.Based on results of the field boring and laboratory testing, subsurface <br /> conditions can be generalized as follows. <br /> From the ground surface, approximately 0 to 6 inches of topsoil and vegetation was encountered. <br /> The topsoil/vegetation was underlain by overburden soils consisting of brown sandy clay or clayey <br /> sand which extended to depths of approximately 3 feet below ground surface. The overburden <br /> soils were low to moderately plastic, and relatively stiff to very stiff. The overburden soils were <br /> underlain by sand with gravel and various amounts of silt which extended to depths of <br /> approximately 34 to 42 feet below ground surface. The sand with gravel soils were generally loose <br /> nearer surface and dense to very dense with depth. Underlying the sand with gravel was claystone <br /> bedrock which extended to the bottom of the test borings. <br /> The stratification boundaries indicated on the boring logs represent the approximate locations of <br /> changes in soil and rock types; in-situ,the transition of materials may be gradual and indistinct. <br />