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Geotechnlcal /Environmental En`Ineerln; • Materials Tefun~ <br />May 21, 1996 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, CO 80477 <br />A[In: Mr. Rick Mills <br />Job No. 96-2505 <br />Subject: Certification Letter, Pond E, Foidel Creek <br />Mine, Routt County, Colorado. <br />Gentlemen, <br />I, Brian D. Len, a registered professional engineer, registry number 25750, in the state of Colorado, certify that <br />Pond E waz relocated and reconstructed per [he design presented in Exhibit SE of permit C-82-056. <br />During the period of October 20, 1995 through March 20, 1996 periodic inspections of Pond E were made to <br />• verify that the embankment was constructed according to Twentytaile Coal Company's permit requirement for <br />lift thickness and compac[ton. The primary spillway is the original Pond E embankment was used except that <br />the orifice elevation was modified az per the current design. A copy of the design is attached. The emergency <br />spillway required to 1/8 to 1/2 inch bedding material and based upon site conditions [his waz modified. to allow <br />placement of a 1" minus bedding matcrial. The placement of [his bedding material will no[ interfere with the <br />functioning of the emergency spillway. A copy of the fmal survey is attached showing the pond configuration <br />and primary and emergenry spillway elevations. <br />If you have any qu tt reg ing this certification, or if we can be of further service, please contact this <br />office. ~ _ <br />Sincerely, <br />Brian D. Len( P.f~.~`~~j;•_ j/\ <br />cc: Precision Excavating, Inc. <br />• <br />(970) 879.7888 • Fax (970) 879.7897 <br />29585 U.S. 40 Wesi, Box 775226 • Steamboat Springs, CO 80477 <br />