2011-01-03_GENERAL DOCUMENTS - P2008043 (3)

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ExxonMobll Refining and Supply Company Downstream-Safety, Health & Environment 3225 Gallows Road Fairfax, Virginia 22037 RECEIVED E*onMobll Refining & Supply May 12, 2003 MAY 19 M3 Tony Waldron Division of Minerals and Geology State of Colorado Division of Minerals and Geology Department. of Natural Resources 1313 Sherman Street, Room 215 Denver, Colorado 80203-2273 RE: Reclamation Activities at the Indian Springs Prospecting Project Dear Mr. Waldron: This letter provides documentation of the reclamation activities for the Indian Springs Project (Project), Prospecting Permit Number P-80-090. The Project was conducted by Mobil Oil Corporation (Mobil), and consisted of uranium exploration in Larimer and Weld Counties in the late 1970s and early 1980s. In 1999, Mobil became a wholly owned subsidiary of Exxon Mobil Corporation (Exxon Mobil). Statewide Prospecting Bond No. 17-003-193 provides financial surety for the Project. Based on the completed status of the Project reclamation, Exxon Mobil is requesting that the Prospecting Permit be cancelled and the Project be released from financial surety. Prospecting was conducted as described in three Notices of Intent to Conduct Prospecting Operations submitted to the Colorado Department of Natural Resources, Mined Land Reclamation Board, dated August 23, 1977, November 10, 1978, and October 27, 1980 (Attachment A). A total of 492 uranium exploration boreholes were drilled during this period. A map displaying the locations of the boreholes is presented in Attachment B. Drilling operations were completed on April 13, 1981. Ms. Linda Walker, of Mined Land . Reclamation Division inspected surface reclamation on November 18, 1983. Ina letter to Mr. Robert B. Lundahl, Mobil, dated November 22, 1983, Ms. Walker classified the Project surface reclamation as "excellent" (Attachment C). Mr. J. J, Faulhaber, of Alternative Energy, in an interoffice memo, dated May 28, 1985 (Attachment D) summarized borehole abandonment procedures and standards for the Project. Boreholes were abandoned with drilling mud consisting of varying viscosities ftorn the bottom of the hole to ten feet below ground surface. Cement plugs were instaged from ten feet to the surface or two "feet below the surface depending upon local cultivation practices. The borehole abandonment standards varied over the course of the Project, but the most stringent standards applied to the 1980 drilling program where 1) the Notice of Intent to Conduct Prospecting Operations (October 27, 1980) states that "All dry holes (those encountering no aquifers) shall be plugged from bottom to within ten feet of surface with a high viscosity drill mud.-Any drill hole which encounters an aquifer(s) shall be plugged as follows: High viscosity mud shall be used to plug the hole as outlined above, except for the interval(s) containing the