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TELESTO <br /> SOLUTIONS. INCORPORATED <br /> July 28, 2021 <br /> Via Electronic Mail <br /> Ms. Stephanie Fancher-English <br /> Loveland Ready-Mix Concrete, Inc. <br /> 644 Namaqua Road <br /> Loveland, Colorado 80537 <br /> Subject: Cell 4—Green-Croissant Pit <br /> Reclamation Slope Evaluation and <br /> Dear Stephanie: <br /> This letter: <br /> t • Summarizes our evaluation of the existing reclamation slopes at the above <br /> referenced mine cell <br /> • Compares our analysis to that provided by Ms. McGill (McGill, 2021) <br /> ' • Evaluates the Division of Reclamation, Mining and Safety's (DRMS's) <br /> correspondence intimating a regrade requirement of Zones 9, 20, 25, 26 and <br /> part of 27 (Hays, 2021) <br /> ' METHODOLOGY <br /> Existing Reclamation Slopes <br /> On July 13, 2021, PLS Corporation performed a bathymetric topographical survey of the <br /> ' ground surface below the water in Cell 4 (referred to as the pond, Attachmentl). PLS <br /> Corporation utilized a remotely controlled boat fitted with global positioning system(GPS) <br /> surveying equipment and sonar detection. They calibrated the machine by wading into the <br /> ' pond and calibrating with the hand-held GPS collector. The boat floated circuitous patterns <br /> throughout the pond collecting elevational point measurements. PLS Corporation <br /> surveyors supplemented the bathymetric point data with topographic survey points <br /> collected around the pond perimeter, beneath the water to wading depth, at the water's <br /> ' edge, slope crest and approximately 15 feet off the crest. They collected data using a hand <br /> operated, survey-grade GPS rod and data collector. Overall, PLS Corporation collected <br /> over 2,100 highly accurate elevation points in their survey. <br /> 1 We reviewed the survey and finding no anomalies in the data, produced a ground-surface <br /> model utilizing Auto Desk's Civil 3D program. We then created 38 cross-sections, <br /> perpendicular to the topographic contours,utilizing Civil 3D's alignment and profile tools. <br /> Colorado Office(Corporate) Grand Junction New Mexico Office <br /> 7501411,Street SW 751 Horizon Court,Suite 109 1303 Pope Street <br /> Loveland,Colorado 80537 Grand Junction,Colorado 81506 Silver City,New Mexico 88061 <br /> ' 970A84-7704/970-484-7789(FAX) 970-697-1550 575-538-5620/575-538-5625(FAX) <br />