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Ero~onMobil Global Services <br />Colony Shale Oil Project <br />ESR Reclamation Studies <br />• Weighing Lysimeter Perforniance 1990-2003 <br />Project No. 353 <br />Page A-2 <br />A.1 ESR Combusted Shale Waste Pile Conceptual Design <br />Because the test plots were intended to demonstrate feasible reclamation techniques, it was <br />necessary to first decide upon certain disposal pile dimensions and parameters. These were <br />documented in a. Conceptual Design Study prepared by Exxon's Colony staff in 1986. The <br />parameters that were selected, along with a brief summary of the rationale, are presented below. The <br />lead case selected for each parameter is generally the lowest cost approach that satisfies the <br />performance goals related to that parameter. <br />Table A-1: Summary of Combusted Shale Pile Conceptual Design <br />• <br />• <br /> Cementation set-up in combusted shale could <br /> provide adequate strength to allow 2:1 slope, <br /> 3 hz to 1 vt between but topsoil veneer could slide. At 3:1, topsoil <br /> benches <br />with hz is just stable if 100% saturated; at 4:1 topsoil <br />Pile slope angle , <br />bench every 50 ft veneer would be stable even if saturated, but <br /> ~~ available disposal volume could become a <br /> problem. Natural hillside veneers in north <br /> facing slope aspen forests with over 3 feet of <br /> soil are stable as at 2.3 to 1. <br /> Strength of loose dumped combusted shale <br />Placement; compacted or Loose dumped, lift (lab tests) was shown to be adequate to <br />loose dumped thiclrness 3 to 10 support pile at 3:1, and hydration of <br /> feet combusted shale can consume infiltrating <br /> water that a lant root zone. <br /> Base case is to rely on hydration capacity of <br /> combusted shale as primary means to <br />Compacted liner and/or cap No compacted liner, intercept and hold infiltration that escapes <br /> no compacted cap plant root zone. If necessary, can create a <br /> nearly impervious outer sheIl by moderately <br /> compacting the outermost lift. <br />LACHEL FELICE & Associates <br />