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' STATE OF COLORADO <br /> DIVISION OF MINERALS AND GEOLOGY <br /> Department of Natural Resources <br /> 1313 Sherman St., Room 215 DIVISION O IFDenver.Colorado 80203 <br /> Phone.(303)866-3567 MINERALS <br /> FAX:(303)832 8106 & <br /> GEOLOGY <br /> June 10, 1999 RECLAMATION <br /> MINING-SAFETY <br /> Ms. Ruth Blackmore <br /> Neighbors for a Livable Boulder Bill Ovvens <br /> 705 South 4 1" Street Gnvernor <br /> Boulder, CO 80303 Greg E.WaltherExecutne Director <br /> M,chael B.Long <br /> RE: Piping Potential for the Deepe Farm Pit Perimeter Levee, Division Director <br /> Western Mobile-Boulder,Inc.,Permit No. M-81-302 <br /> Dear Ms. Blackmore: <br /> Please find enclosed a copy of a piping analysis for the Deepe Farm Pit levee prepared by CTL/rhompson, Inc. for Western <br /> Mobile-Boulder. This analysis was submitted to the Division of Minerals and Geology(DMG) to satisfy a requirement <br /> listed in the DMG's report on a February 18, 1999 site inspection. You were previously sent a copy of the inspection report. <br /> The piping analysis has been reviewed by the DMG staff in consultation with the staff of the Colorado Water Conservation <br /> Board. As a result of this review, DMG has determined that levee failure via a piping mechanism is highly unlikely to occur <br /> during the design, one-percent annual chance Flood on South Boulder Creek. DMG has further determined that Western <br /> Mobile-Boulder has adequately addressed the piping concern identified during the February 18, 1999 inspection of the <br /> Deepe Farm Pit and documented in the inspection report. <br /> The regulations of the Colorado Mined Land Reclamation Board (Rules 1.4.7 and 1.9.2)provide that the DMG's <br /> determination in this matter may be appealed to the Board if the appeal is filed within sixty(60)days, i.e., no later than <br /> August 10, 1999. Any request for administrative appeal must specify the permit number for the operation in question <br /> (Deepe Farm Pit: Permit No. M-81-302)and must list all factual and legal questions the appellant wishes to have the Board <br /> decide. <br /> If you have any questions, please contact myself or Gregg Squire. <br /> Sincerely, <br /> Allen C. Sorenson <br /> Reclamation Specialist <br /> Enclosure(s) <br /> cc: Gregg Squire, DMG (w/o enclosures) <br /> Tom Browning,Water Conservation Board (Room 721)(w/o enclosures) <br /> Mike Hart, Hart Environmental (w/o enclosures) <br /> John Hickman,Western Mobile (tv/o enclosures) <br /> Ed Smelko (w/enclosures) <br /> Alan Taylor,City of Boulder(tr/enclosures) <br /> c:\wmdows\personal\Deepe Farm.doc <br />