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~~.QR <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />June 11, 2003 <br />COLORADO <br />DIVISION OF <br />M[N SRALS <br />GEOLOGY <br />RECLAM ATION•MI NINO <br />SAFETY•SCIENCE <br /> Bill Owens <br />Wayne Brantley c°ver°nr <br />Pioneer Sand Com an <br />ITiC <br />P Y Greg E. Watcher <br />. <br />, Executive Director <br />Colorado Division <br /> Ronald W. Cattany <br />7608 Highway 93 Division Director <br />Golden, CO 80401 Natural Resource Trustee <br />12E: Ingleside Quarry, Terracon Proposal for Geotechnical Engineering Services <br />Permit No. M-80-037, Class: General Documents <br />Deaz Mr. Brantley: <br />I have reviewed the June 5, 2003 proposal from Terracon to Pioneer Sand Company, Inc. <br />to provide geotechnical and geologic engineering services for the Ingleside Quarry. You <br />have requested that I review the proposal to determine if the proposal will meet all of the <br />Division's current concerns with respect to highwall stability and reclamation. I <br />conclude that the Terracon proposal will only partially address our concerns. The <br />proposal submitted by Terracon will also need to include a geotechnical engineering <br />evaluation to demonstrate the factor of safety provided when the highwall is at its <br />maximum extent as well as when the highwall is in its final reclaimed configuration. The <br />proposal will need to quantify the extent of drilling and blasting required to reclaim the <br />highwall when it is at its maximum extent and include the cost for such activities. A cost <br />will also be needed for moving the blasted or shot rock into a final reclaimed <br />configuration. A detailed description of any anticipated blasting activity should also be <br />provided. The Division will be reviewing the proposal to verify that it adequately meets <br />the requirements of Rule 6.5 Geotechnical Stability Exhibit as well as Rule 6.4.12 <br />Reclamation Cost. Attached aze copies of these rules. <br />Please call me at (303) 866-3567 if you have any further questions. <br />Sincerely, <br />Thomas A. Schreiner <br />Environmental Protection Specialist <br />Attachment <br />Office of Office of Colorado <br />Mined Land Reclamation Active and Inactive Mines Geological Survey <br />