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M <br />i T1_ T e-0- <br />Wriaht Water Enaineers. Inc. <br />2490 West 26th Ave., Suite 100A www.wrightwater.com <br />Denver, Colorado 80211 e-mail: gwitt@wrightwater.com <br />(303) 480-1700 TEL <br />(303) 480-1020 FAX <br />August 28, 2018 <br />Mr. Leigh Simmons <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman St., Rm. 215 <br />Denver, CO 80203 <br />Re: Spring 2018 Subsidence Monitoring Report Preparation — Mountain Coal Company, LLC. <br />Dear Mr. Simmons, <br />The following report entitled Spring 2018 Subsidence and Geologic Field Observations — South <br />of Divide and Dry Fork Mining Areas, was prepared by, and under the supervision of, Gary D. <br />Witt, a licensed professional geologist and employee of Wright Water Engineers, Inc. <br />Sincerely, <br />WRIGHT WATER ENGINEERS, INC. <br />LM <br />Gary D. Witt, P.G., CPG <br />Vice President <br />Sr. Hydrogeologist/Geological Engineer <br />ZAProject Files\72-99\831-032\831-032.900\Engineering\Spring 2018 Subsidence\Report\Covers, Dividers and Signature Page\signaturepage.doc <br />GLENWOOD SPRINGS DURANGO <br />(970) 945-7755 TEL (970) 945-9210 FAX (970) 259-7411 TEL (970) 259-8758 FAX <br />