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BLUE <br />MOUNTAIN August 31, 1999 <br />ENERGY, INC. <br />116uMldlary of <br />DeeeretGenentlon8 Mr. Dan Mathews <br />Trnnunlalan <br />CaoyerntHe Division of Minerals and Geology <br />2148 Broadway,#C-5 <br />3667000nryRd.65 Grand Junction, Colorado 81503 <br />Renpely, CO 61616 <br />iii iiiiiiiiiiiu iii <br />970.675.9131 RE: Professional Certification for Refuse Area Sediment Pond 4 at the Deserado <br />Fu: 976.675.5229 Mine Property <br />File No. C-OI 5-81. <br />Dear Dan: <br />I am a professional engineer registered in the State of Colorado and my experience fulfills the <br />requirements of the Colorado Surface Coal Mining Reclamation Act. <br />Modifications to the approved design of Refuse Area Sediment Pond 4 were made to improve the <br />functional efficiency and do not detract from the structural integrity or fimctionality of the original <br />design. Such modifications include the enlargement of the pond by removing additional material <br />upstream of the dam. <br />To the best of my knowledge, based on my professional expertise, Refirse Area Sediment Pond 4 at <br />the Deserado mine was constructed in conformance with prudent state-of--the-art construction <br />practices. Further, [he structures were constructed in compliance with [Ite approved design, as <br />specified within Section IV.J of the approved permit documents and depicted on Map 80 and other <br />permit documents or maps as amended from time to time. Map 80 enclosed herein is a true <br />representation of Sedimentation Pond 4 as constructed. <br />certify, based on my field observations and those observations of my qualified designates and <br />professional investigations, as detailed above, that Refuse Area Sediment Pond 4 at Blue Mountain <br />Energy, Inc., Deserado Mine, located in Rio Blanco County, Colorado, were constructed in <br />compliance with the design approved as a portion of Permit No. C-018-81, issued by the Colorado <br />Division of Minerals and Geology. <br />Respectfully, <br />Gc/GiG~.-er,~, ~ y~-- <br />William C. Lepro, P.E. <br />Project Engineer <br />Colorado Registered P.E. No. 30263 <br />Enc: Map 80 <br />xc: Murari Shrestha <br />Jeff Dubbert <br />Scott Wanstedt <br />File <br />