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BD GEOI`.NVIRONMENTAL SERVICES <br />Bxnrr'r A. DErrrrls, C. P. G <br />RECrGO~ ED (COr~Txncr GFAIAGLST - C"tBcE, GFALOGIC SEavicFS) <br />2p03 1371 Ft.IN'I'WOOll ROAn <br />SAN 31 FxANKTOwN, COI.ORnno 80116 <br />d Gaolo9V 1'x[F.rr[ox~Fnx: (303) 660-1879 <br />of Minerals an CELIt (303) 726-9956 <br />pivision <br />U.S. Department of Interior <br />Bureau of Land Management <br />P.O. Box 68 <br />Kremmling, Colorado 80459-0068 <br />Attention: Ms. Paula Belcher/Mr. John Morrone _ <br />RE: Abandonment of Four Wells, Kerr Mine, Jackson County, Colorado <br />Dear Ms. Belcher/Mr. Morrone: <br />In October 2002, CT&E -Geologic Services, Gillette, Wyoming, was engaged to permanently <br />seal four BLM/USGS water monitoring wells at the closed Kerr Mine, east of Walden, Jackson <br />County, Colorado. The wells were X-4, #23, #32, and #33. These wells were drilled during the <br />1970's and 1980's. The wells were of varying depth and completion technique. <br />Three of the wells (X-4, #32, and #33) were deeper than 50 feet. Each of the wells had 2 inch <br />factory slotted casing. All the wells had clean casing to the approximate depth indicated by <br />BLM. After verifying water level, Western American's drill rig set up over the well and lowered <br />tremie pipe into the well. Based on the well depth and the diameter of the casing/ammulus, a <br />calculated volume to seal the well was then determined. Cement was mixed and pumped into the <br />well. Cement was circulated to the surface and the tremie pipe withdrawn. Additional cement <br />was added to bring the top of the cement to near surface as the tremie pipe was withdrawn. A <br />7.875" tri-cone bit was used to drill a hole on top of the well to ] 0 feet below ground surface. <br />This hole was then filled with concrete to neaz ground surface. A metal stake was then placed in <br />the cement on which a metal tag with the alpha-numeric identification designation for the well <br />was riveted. The azea was then smoothed, raked and seeded. <br />For well #23, the BLM data showed a possible depth of 130 feet. The measured depth was 32 <br />feet. This well was constructed with 4.5-inch diameter slotted fiberglass casing. It was decided <br />to wash out the well using a 4 inch drag bit and drill steel. After reaching 32 feet, it was <br />necessary to drill to get deeper than 32 feet. It was determined that after 32 feet; the material <br />coming up the well casing was native soiUrock. Therefore, after discussions with Ms. Belcher, <br />who was on site at that time, it was decided to abandon this well at 40 feet. The casing was <br />pulled and the hole filled with sand to approximately 10 feet. The top ten feet was filled with <br />concrete. A metal stake was then placed in the cement on which a metal tag with the alpha- <br />numeric identification designation for the well was riveted. The area was then smoothed, raked <br />and seeded. <br />