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~V~ <br />~3 - <br />esau~ces, Inc. <br />October 19.2006 <br />Steve S. Shuey <br />Division of Minerals and Geoioey <br />Grand Junction Field Office <br />101 South Third Street, Room 301 <br />Grand Junction, CO 81501 <br />RECEIVE® <br />OCT 2 5 2006 <br />,IIRICTION FIELD OFFICE <br />~a~q~ ~~ 3 SAFETY <br />,a.i ~'~ <br />,,f =,~- <br />RE: Monitoring Plan to Characterize Attenuation of Ground Motions Generated by <br />Mechanical Equipment Operating at the Benson Brothers Red Shale Ouarry. Colorado <br />Mined Land Reclamation Permit #M-2005-071 <br />Dear Mr. Shuey, <br />We are submitting this addendum to the Vibration Monitoring Plan previously submitted <br />by Revey Associates,Inc. for the Benson Brothers Red Shale Pit in order to comply with <br />the conditional approval of the Mined Land Reclamation board on May 10, 2006 and the <br />Board ruling on the Motion for Clarification on September 13, 2006. <br />After initial monitoring of vibrations on site to chazacterize attenuation of ground <br />motions generated by mechanical equipment operating at the Benson Brothers Red Shale <br />Quarry as proposed by Mr. Gordon Revey of Revey Associates, Inc., monitoring will <br />continue for 30 days by activating one automatic recording seismograph while <br />mechanical equipment is being operated in the quarry. It is understood that normal <br />crashing or ripping activity for a thirty day period may only be 3 to 5 days. The location <br />of this seismograph will be determined by Mr. Revey in consultation with Division of <br />Mining, Reclamation and Safety representatives. The seismograph and operation <br />instruction will be provided by Saza Nation of PreSeisTek, Inc. Data evaluation and <br />reporting will be accomplished as specified in the previously submitted plan. <br />Respectfully submitted, <br />/~ <br />~~ <br />Michael Ripp <br /> <br />19,'',1 ,'1k',LU err:: (v70) Ct.'h-"}tbl ~ e~ma'd: ccvrq:~F•'~aoLCOrn <br />