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(Installation of casing and blowout preventers in drill holes in known oil, gas, and geothermal <br />azeas) <br />The Dry Fork and Lions Mesa areas aze not in a producing natural gas field. Significant <br />quantities of gas under pressure are not known to have been encountered in any of the previous <br />drilling efforts in the area. Methane from coal mining has been liberated in significant quantities <br />at the West Elk Mine. Since the proposed drilling will not penetrate the entire Rollins <br />Sandstone and not drill into the underlying Mancos Shale, blowout preventers may not be used. <br />Casing will be set in each hole as necessary to maintain circulation of cuttings to the surface. <br />(Drill hole plugging requirements) <br />Each drill hole will be plugged according to the requirements outlined in this section: The hole <br />will be plugged with cement from 50 feet below to 50 feet above any mineably thick coal bed or <br />potentially usable aquifer. <br />The remainder of the hole will be filled with a completion mud (bentonite gel) and/or drill <br />cuttings or cement to within 10 feet of the surface. A 10 ft. thick cement surface plug will be set, <br />capped with an appropriately marked brass or aluminum monument, at or below ground level. <br />(Retention of drill and geophysical logs by applicant) <br />The company will retain in its files, all drill and geophysical logs for at least 1 yeaz, and will <br />make them available for inspection by any authorized officer. An authorized officer will keep all <br />un-analyzed drill cores in possession for at least one yeaz if requested, and will be available for <br />inspection. <br />Map of Exploration Area: <br />A map of the proposed exploration area at a scale of 1:24,000 (I"= 2,000'), showing all drill <br />hole locations, existing roads and access roads to be constructed is included in the pocket folder <br />of this application. <br /> <br />15 <br />