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<br />o Exxon completed the grading of the three-mile segment of the Valley <br />Access Road from CR 215 to the southern boundary of the Colony resource <br />block. Major components of this work included construction of abridge <br />at Union Meadows to serve as a wildlife crossing under the access road <br />and construction of a retaining wall at a location where the road was <br />tightly confined between the natural hillside and Parachute Creek. Use <br />of the retaining wall permitted the hillside to be graded to a stable <br />slope for revegetation without encroaching on the stream. <br />o In late 1982, Exxon performed major improvements to the Davis Gulch <br />cofferdam to satisfy the State Engineer's requirements for the extended <br />• use of this facility. With the addition of an emergency spillway and <br />structural upgrading at the downstream toe, the cofferdam can now serve <br />as a long term sediment control structure. (see Exhibit D-2) <br />o Portions of the Colony Pilot Mine have been reinforced, and sensitive <br />rock monitoring instruments have been installed to insure the continued <br />long term stability of the mine opening. The Pilot Mine will serve as <br />the east ventilation exhaust portal for the Colony Mine. The Pilot Mine <br />has been and will continue to be used to provide oil shale to the Pilot <br />Retort in Baytown, Texas as well as for extensive blasting, ventilation <br />and rock mechanics research. Research conducted to date has been co- <br />operatively funded by the U.S. Bureau of Mines (US BM ), the Department of <br />Energy (DOE), and the Colorado Mining Association (CMA), the latter <br />• being an organization composed of companies directly involved in oil <br />shale development in Colorado. <br />D-2 <br />