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~:~ • .~ _. • _ _~ ~iiiiiiiiiiiniiiiii EON COMPANY, U.S.A. POST OFFICE BO% 14342 • AURORA, COLORADO 80014 SYNTHETIC FUELS DEPARTMENT OPERATOR. COLONY SHALE OIL PROJECT Dr. Steven G. Richardson Mined Land Reclamation Board Colorado Department of Natural Resources 1313 Sherman Street Denver, Colorado 80203 RE: Permit 80-47 October 1981 Amendment Application Dear Dr. Richardson: rJ11,:~. , . , Flo. U.. December 7, 1981 1 ,1 ,:~v ,, I yes Dc C 8 1981 11>~V~u 1~1iVD P.CCLAEI~~;i~ ~e1e• (Tepi, of natural Resources In response to your November 23, 1981 letter to A. C. Bishard requesting further information on the October, 1981 amendment application, Exxon provides the following: 1. Exhibit I of this letter contains the soils data you requested for the Parachute laydown area. 2. Figure 1 provides more detail on the drainage and sediment control plan for the Parachute laydown area. Two sedimentation ponds, each designed for a 10-year, 24-hour storm, will receive drainage from the disturbed areas. Topsoil will be used either to build the surrounding berms or will be stored in designated stockpiles. Detailed design of these sediment control facilities is now underway. We will advise you if significant changes occur to the preliminary design shown in Figure 1. Gravel will be applied to the equipment storage and laydown yards. Final reclamation of these areas will consist of removing the gravel, retopsoiling and revegetating with the permanent seed mix specified in the Colony Reclamation Plan for the Parachute terminal facilities (page E-36 of the original MLRB permit application). The gravel will either be sold for reuse off the Project or will be used elsewhere on the Project site. At the present time the total area required for the oil mist yard has not been finalized, but we estimate that between two and five acres will be necessary. The oil mist yard will serve as an equipment storage and laydown area in which oil will be applied to the internal rotating parts of equipment to protect against corrosion. It is not anticipated that the gravel soil cover will be significantly contaminated by oil. For final reclamation the gravel from the oil mist yard will be handled the same as that from the other storage and laydown areas as discussed in response #3 above. Should some of the gravel cover or underlying soil be contaminated by oil to the extent that it is unsuitable for sale or re-use, it will be properly disposed of in an appropriate waste disposal facility approved for such wastes. no Soli I~rPMs - ~c~• A DivI510N OF E%%ON CORPORATION