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TELESTO <br /> SOLUTIONS* IN CORPORATE D <br /> September 10, 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: DRMS Permit Application—Dunn Pit <br /> Exhibit S—Inlet Protection <br /> Dear Stephanie: <br /> Please find attached our calculation set that evaluates the need for flood inlet/outlet <br /> protection for the mining cells for the proposed Dunn Pit. We modeled various floods <br /> flows utilizing an unsteady,2-dimensional flow model and identified the areas where flood <br /> waters would first enter the cells,then modeled the maximum flows expected during a 100- <br /> year peak event to determine the size of riprap protection required. <br /> If you have any questions regarding this analysis, please do not hesitate to contact Jon <br /> Cullor or me at your earliest convenience. <br /> Sincerely, <br /> Telesto Solutions,Inc. <br /> Walter L.Niccoli, PE <br /> Principal/Senior Engineer <br /> WLN <br /> Enclosure <br /> Colorado Office (Corporate) Grand Junction New Mexico Office <br /> 750141 Street SW 751 Horizon Court,Suite 109 1303 Pope Street <br /> Loveland,Colorado 80537 Grand Junction,Colorado 81506 Silver City,New Mexico 88061 <br /> 970484-7704 1970-484-7789(FAX) 970-697-1550 575-538-5620 1575-538-5625(FAX) <br />