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engineer, experienced in construction of similar earth and waste <br />structures. Inspection by this person has been approved by the <br />Division as appropriate (4.10.2(1)). <br />The operation is in compliance with this section. <br />IX. Coal Mine Waste <br />Non-coal processing waste narrative may be found on pages 55 and 76 of <br />2.05, Volume 1. Underground development waste rock pile and <br />specifications are documented in Volume 6A. <br />The operator's plan for non-coal processing waste disposal on site is <br />in compliance with the regulations. Non-coal processing waste such as <br />paper trash, garbage, scrap metal, and other non-hazardous waste is <br />currently disposed of at the Delta County Landfill. <br />X. Backfilling and Grading <br />COVCC's application for a permit for the Orchard Valley Mine proposes <br />a reclaimed final configuration for the surface facilities areas of <br />the mine which consists of a partial backfilling scheme. In the <br />preliminary adequacy review of the original permit application, the <br />Division stated that it considered their proposal to be inadequately <br />supported within the application. Further, the Division required the <br />applicant to complete an appropriate geotechnical and stability <br />analysis to demonstrate that the proposed final configuration would be <br />stable and would satisfy the requirements of Rule 4.14 and 4.27, <br />"Operations on Steep Slopes." The results of the analyses would then <br />be utilized by the applicant to prepare a detailed engineering design <br />which conforms with the above-enumerated regulations. <br />The operator retained the services of Merrick and Company and <br />Geo-Hydro Consultants, Inc. to investigate the slope stability of the <br />entire surface facilities area at the Orchard Valley Mine. Phase I of <br />this study was completed and a summary report, prepared by Geo-Hydro <br />Consultants, Inc., was submitted to the Division for review on <br />July 21, 1981 (See Volume 6). The analysis, prepared in accordance <br />with the present state-of-the-art of geotechnical analysis, determined <br />that no immediate major hazards existed at the mine site. The report <br />does observe, however, that some local stability problems exist and <br />the factors of safety of individual cuts and fills will have to be <br />increased by redesign and reconstruction to achieve a stable final <br />reclaimed configuration, in accordance with the regulations. <br />Geo-Hydro, Consultants, Inc. completed the Phase II analyses on <br />April 15, 1982, in accordance with the stipulated requirements of the <br />originally approved Permit (See Volume 6). The stipulated tasks of <br />the Phase II analyses included evaluation of nearby landslides mapped <br />by the Colorado Geological Survey, completion of test drilling and <br />test pits, installation of monitor wells, soil and rock testing, and <br />the completion of a series of stability analyses for current slope <br />configurations of the existing surface facility area at the Orchard <br />Valley Mine. <br />-34- <br />