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~V <br /> <br />RECEIVED <br />November 8, 2006 <br />NOV 1 3 2006 t/ <br />GRAND JUNC710N FIELD OFFICE <br />Steve S. Shuey DIVISION OF <br />Division of Reclamation, Mining and Safety ~ RECLAMATION MINING & SAFETY <br />Grand Junction Field Office <br />101 South Third Street, Room 301 <br />Grand Junction, CO 81501 <br />RE: Benson Brothers Red Shale Pit, File No. M-2005-071,~ibration Monitoring eo++aM ~fr.<~~->~ <br />Adequacy Review <br />Deaz Mr. Shuey: <br />Benson Brothers make the following commitment regarding the Revey Vibration <br />Monitoring Plan for the Benson Brothers Red Shale Pit. <br />PreSeisTek, Inc. will certify that the seismographs conform to standazds recommended <br />by the vibration section of the International Society of Explosives Engineers and that the <br />instruments have been calibrated by the manufacturer in the 12 months prior to their use <br />at the site. <br />An executed original Performance Warranty has been submitted to Elizabeth Shelton in <br />the Denver Office. <br />Respectfully submitted, <br />i~i2~~~~ <br />Michael Ripp ~!~_ <br />Consultant <br />F'~,,,_ <br />~4(1V ~ ~ ' `~ ~~ <br />plvisipn ~' and ga~etY <br />Minln9 <br />P.O. Box 54 • Delta, CO 81416 <br />(970) 874-5127 • Fax: (970) 874-3161 • e-mail: mvripp®aol.com <br />