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-,, September 4, 1981 Page 2. Smooth and grade ground surface to collector drain, includes filling in existing ponds. Construct drain system, and Initiate placement of refuse on prepared surface. Once the above is achieved, the placement of refuse material will proceed from the north to the south with lift thickness less than 24 inches and compacted to at least 90% of the maximum density determined using T-99. However, the pile will be developed in two stages until the top of the pile is raised 10-15 feet from the prepared surface elevation. The southern half of the pile will be developed first, then the northern half of the pile will be developed. Once the northern half of the pile is brought up to the same elevation as the southern half, placement of material in each lift will be initiated at the north end of the pile and proceed to the south until completion of the ]if t. Existing topsoil, topsoil stockpiles, and overburden will be moved and graded as dictated by construction activities. 1'The analyses of .the refuse material being placed in the pile indicate that no severe toxicity problems should be expected. during the development of •the pile.. Therefore, 6-12 inches of topsoil will be placed over 'the suri~ace i of the refuse material and revegated as per the plan specified in the: February 10, 1981 submission. Empire Energy will continue to analyze the "refuse material on a semi-annual basis, and if the chemical character of the refuse material changes into a toxic or acid-forming one, then the appropriate steps will be taken to investigate its impact on the reclama- tion activities and amend the reclamation plan as necessary. The above is a summary of the plans contained in the attached CTL/Thompson report. This report should be incorporated into Appendix IV-5 and re- places the design specified in previous CTL/Thompson's reports. The back-up calculations for the static safety factor contained in the previous CTL/Thompson reports are incorporated into the current report by reference. The approved plan called for a sediment pond on the southwest side of the pile, however, due to actual field conditions (i.e., grade), this pond could not be installed. Instead an irregular shaped pond was placed at the southern end of the pile. Due to seepage concerns, this pond will be eliminated and all of the drainage from this area will tie routed to Pond HR-Pl. Leonard Rice Consulting Water Engineers reviewed the design of the pond, both from-3a~supplied by Empire and a field investigation, and have advised that pond HR-Pl is adequate to handle the drainage from this area in addition to the area presently draining into the pond. This report is attached and should be incorporated into Appendix IV•-3. r^'~ ~. a The reclamation of the pile will follow the steps contained in the February 10, 1981 submission except for the change detailed above. The expected