Laserfiche WebLink
~~~ME~~ Q~~oc~o~~~~9 ~~~o <br />Gordon F. Revey 9250 E. Morning Star Place <br />Prhicipal Parker, CO 80134-5611 <br />Phone: (303} 470-0416 <br />Fax: (303)791-0140 <br />Jut1e 1, 2006 Email: grevey@earthlink.net <br />Atttention: Attention: Messrs. Ed Benson, Benson Brothers and Michael Ripp, MVR <br />Resources. <br />cc. Sara Nation, PreSeisTek, Inc. <br />RE's: Monitoring Plan to Chazacterize Attenuation of Ground Motions Generated by <br />Mechanical Equipment Operatit? at the Benson Brothers Red Shale Ouanv. Colorado <br />Mined Land Reclamation Permit #M-2005-071 <br />Gentlemen: <br />As requested I have prepazed plan for implementing a vibration measurement study at the <br />Red Shale Quarry in Cedaredge, CO. Details follow. <br />Monitoring StudK Purpose: The purpose of this monitoring is to establish site-specific <br />vibration attenuation characteristics of vibration caused by mechanical mining equipment <br />and the rock crusher that will be operated at the quarry. Of specific interest is the nature of <br />vibration intensities and attenuation characteristics in the Rollins sandstone formation. <br />Monitoring Equipment: Since measured ground motions will be very low in intensity, <br />me;asurements should be made with instruments that can measure motions with intensities as <br />low as 0.005 in/s. MiniSeis or Series III Seismographs, respectively made by White <br />Seismology or Instantel, can measure these motions and are appropriate for this study. All <br />equipment used should-conform fully to standards recommended by the Vibration Section of <br />IS]EE and should be calibrated within 12 months of the time of use by the manufacturer. <br />Tvvo instruments will be used for the initial monitoring work and a single instrument will be <br />used for further measurements if needed. <br />Duration of Studv: Vibration data will be collected over a period not exceeding 30 days. <br />Etc uipment Operation and Data Collection: Once initial stripping of overlying soils has <br />exposed hazd rock surfaces, inifial measurement work will be done by Sara Nation of <br />PreSeisTek, Inc. This work will be coordinated to ensure representatives of Colorado State <br />Division of Minerals and Geology (CDMG) can be on-sight to oversee it. The author will <br />