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1) c 1382 W Ninth St., Suite 400 T 216.344.3072 p <br /> Cleveland, OH 44113 TRCcom anies.com <br /> May 24, 2024 <br /> Brady Reece, Chief Commercial Officer <br /> Colorado Sand Company II, LLC <br /> 2001 Kirby Drive, Suite 360 <br /> Houston, TX 77019 <br /> RE: Geotechnical Stability Report <br /> Kersey Sand Mine <br /> County Road 61 and County Road 64 - Kersey, Colorado <br /> TRC Project No.: 535891.0000.0000 <br /> Dear Mr. Reece: <br /> TRC Engineers, Inc. (TRC) is pleased to present this Geotechnical Stability Report related to the <br /> proposed surface mining to be performed at the Kersey Sand Mine located along Country Road <br /> 61 and Country Road 64 in Kersey, CO (Project Site). The work was performed by TRC as <br /> requested by the Colorado Sand Company LLC in accordance with TRC's proposal and the <br /> subsequent authorization to proceed. This letter report summarizes our understating of the <br /> project, describes the recently completed geotechnical drilling and testing procedures, discusses <br /> our observations of subsurface conditions at the boring locations, and presents setback and cut <br /> slope recommendations related to the proposed surface mining operations at the Project Site. <br /> PROJECT DESCRIPTION <br /> The project site is located east of Weld County Road 61 and south of Weld County Road 64 near <br /> Kersey, Colorado. The site area is relatively flat and undeveloped and primarily vegetated with <br /> grasses and other vegetation. Proposed plan and profile or grading plan of the surface mine is <br /> not available at the time of writing this report. Based on our understanding of the project, existing <br /> features on the Project Site includes oil and gas well heads, water wells, and oil, gas and water <br /> pipelines. The depth and size of the wells and pipelines have not been provided to TRC. We <br /> understand that currently plans consists of providing a 50-foot buffer from all pipelines and well <br /> heads and that the anticipated maximum excavation depth of the surface mining is 20 to 30 feet <br /> below existing ground surface (bgs). <br /> FIELD AND LABORATORY WORK <br /> Field Work <br /> TRC coordinated the completion of a total of eight (8) Standard Penetration Test (SPT) borings <br /> designated as TH-1 through TH-8 on April 29, 2024, at the approximate locations shown on the <br /> attached Boring Location Plan (Attachment A). TRC subcontracted a local drilling contractor, <br /> CTL Thompson, Inc. to complete the drilling and soil sampling. The boring locations were marked <br /> out in the field by TRC with the use of a hand-held GPS unit utilizing sub-foot accuracy. Prior to <br /> drill rig mobilization, TRC's drilling subcontractor contacted the Colorado 811 One Call utility <br /> notification service to verify public utility locations within public right-of-way and easements where <br /> these utilities may enter the Project Site.TRC geologist was on-site to inspect and log the borings. <br /> c <br />