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Technical Memorandum, Anne Beierle, Henderson Mine, September 10, 2002, Page 2 Results 2.67 acres of capping were completed, and, in my opinion, a good test of the geo- synthetic materials resulted from the construction effort. The cost for materials as reported by Tensar representatives for BX4100 and BX4200 aze respectively: $0.09 and $0.16 per squaze foot. Mirafi HP370 was quoted to Climax at $0.09 per square foot (personal communication with K. Kinnazd of Bowman on 9/12/01). A cost estimate for installing all materials can be made from information collected by EEE, based on real-life experience at Climax during this test plot study. Based on $20 per man-hour for labor and assuming a 2-man crew for Tensar products and a 3-man crew for Mirafi I4P370 (rolls aze too heavy for two workers to handle), the costs for staging, laying, unrolling, anchoring with rocks, staples or ties is: (1) Tensar BX4100 and Tensaz BX4200 Installation Cost = $0.02 per square foot and (2) Mirafi HP370 Installation Cost = $0.016 per squaze foot. Transportation costs are $0.0041/ square foot for BX4100 and $0.0069/squaze foot for BX 4200. Shipping is included in the Mirafi cost of $0.09 /square foot number. The total cost of material, delivery, and installation for each product is as follows (assuming a one foot overlap between rolls and 4 feet on the ends = 7% additional material needed): Tensar BX4100 = $0.1141/ftZ or ($0.1141)x[43560 ftZ/ac+ (0.07x 43560)] _ $5318/ac Tensar BX4200 = $0.1869/ftZ or ($0.1869)x(43560 ftZ/ac+ (0.07x 43560)] _ $8711/ac Mirafi HP370 = $0.106 /ftZ or ($0.106) x [43560 ftz/ac+ (0.07x 43560)] _ $4940/ac Summary and Recommendations The objectives of the field study were met. That is, all three products were viable alternatives to conventional capping. Costs for material and installation are on the order of $4940 to $8711 per acre for the three products tested . References Bergado, Anderson, Miura, and Balasubramaniam. 1996. Soft Ground Improvement. American Society of Civil Engineers Press, New York. Ellis, M.D. August 1997. Reclamation Cost History of Climax Mine for the Period 1987 through 1996. Ellis Environmental Engineering, Inc. Golden, Colorado. Koerner, Robert M. 1997. Designing with Geosynthetics, Fourth Edition. Prentice Hall, Upper Saddle River, NJ 07458. Sheridan, Terry. 9/18/01. Letter to Ellis with budget costs for Tensar Products. www.tensazcorp.com. Specifications for Tensaz Products. www.mirafi.com. Specifications for Mirafi HP370.