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2.0 Minine and Oil and Gas <br />to 25 feet, then placing the 13 318 inch conductor pipe. The conductor pipe was cemented into <br />place, and drilling was commenced with a 12 1/4 inch bit to 207 feet depth, when the surface <br />conductor washed out and drilling was ceased to recement the conductor. Drilling continued to 448 <br />feet, where an 8 5/8 inch casing was set at 438 feet. Drilling then continued with a 7 7/8 inch bit <br />' to 1,550 feet, where a 5 1/2 inch production casing was set. <br />When well 28-10 was drilled, the temperature log indicated that gas was entering the borehole at <br />' approximately 504 feet below ground surface (bgs). During the 8 5/8 casing run, no circulation to <br />the surface was noted. When the 5 1/2 inch casing was cemented, gas was noted flowing between <br />the 8 5/8 inch and the 5 1/2 inch casing. After the cement was pumped down the 8 5/8 inch by 5 <br />' 1/2 inch annulus, gas pressure of 20 to 30 pounds per square inch (psi) was still noted in the <br />annulus between the 8 5/8 inch and 5 1/2 inch casing. A suspected fault zone was noted at 630 <br />feet. Analysis of the bond log for the casing cement indicates that no cement exists above 450 feet <br />' and that possible poor bonding occurred from 450 to 535 feet bgs. During the surface methane <br />survey in November 2000, 20 psi of pressure was still indicated in the 8 5/8 inch annulus. <br />' Monitoring with a FID indicated the pressure of organic vapors within the annulus of the 8 5/8 <br />inch and 5 1/2 inch annuli. During the drilling of the 28-11, no irregularities were noted. <br />Both wells were plugged and abandoned on October 9 and ~, 2000, by GeoMet. During <br />plugging, soils surrounding the well casing were monitored with a FID. According to the Colorado <br />Oil and Gas Conservation Commission (COGCC) environmental specialist who was present during <br />the plugging, no gas was detected during excavation of soils near the well heads. Methane was <br />reported in the casing (between the 8 5/8 and 5 1/2 annuli) with pressure of 20 psi. Afer the <br />plugging procedure, no gas was detected near the abandoned wells. Correspondence from the <br />' COGCC dated October 25, 2000 stated, "The gas wells are definitely not the source of the <br />methane seep." A copy of this correspondence is included in Appendix B. <br />Meth{292}I1-02.docMovembec 20, 2002 19 <br />