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1 C-b Tract be returned to a condition as nearly equivalent to its original state as possible so that it can support the same kinds and number of ' animals as now exist on the Tract, A Preliminary Development Plan was submitted to the Area Oil Shale Supervisor shortly after award of the Lease. It described tentative development plans, the types of planned activities, and an approximate time schedule that was subsequently carried out. The Exploration Plan, covering activities during the first two years, defined the extensive environmental data collection programs and the exploration efforts planned to evaluate the oil shale reserves. The C-b lessees submitted its Detailed Development Plan (DDP) to the Area Oil Shale Supervisor (AOSS) on February 9, 1976. This plan incorporates the environmental baseline data collected during the first year and describes a plan for commercial development for Tract C-b. Public hearing on all aspects of the DDP were held in April, 1976. ' The Lessee of Tract C-b requested on March 2, 1976, and were granted effective September 1, 1976, a suspension of operations pursuant to Section 39 of the Mineral Leasing Act (30 USC 209) and Section 22 of Oil Shale Lease Number C-20341. This suspension was requested in the in- terest of resource conservation for the primary purpose of allowing the Lessee an opportunity to consider alternatives that might achieve a greater ultimate recovery of the oil shale resource in an environmentally acceptable manner. On November 22, 1976, the AOSS notified the Lessee as follows: "The Area Oil Shale Office has completed the re- quired review of the Detailed Development Plan which you submitted for Colorado Oil Shale Tract C-b on February 9, 1976, and has found that, with the additions developed during the review process, the plan meets the terms and conditions of the oil shale lease. Its imple- ' mentation, however, requires resolution of issues which resulted in a 1-year suspension of operations effective September 1, 1976". Recently, a Modification to the DDP was submitted to the AOSS to address those areas of change brought about by the use of the Oxy process for development of Tract C-b. This change in plan for the development of Tract C-b is the result of actions envisioned by the Lessee when an ap- plication for suspension of operations was requested on March 2, 1976. Although some geotechnical confirmation work needs to be completed, the Lessee believes this plan resolves the matter of conservation of resource. 1 -3