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-6- • :, ~ angle of internal friction for compacted waste consisting ~p:rimarily of overburden spoil would range from 30 to approxi- mately 40 degrees. Some ,finer materials may remain as a result of the processing. For purposes of stability analysis, a`; we used an angle of internal friction of 25 degrees with no ," cohesion. In our opinion, this will be a relatively safe value; however, it can be confirmed after the processing plant is in operation and materials are available for testing. ~8. Our stability analysis indicztes that a factor of safety on ,the order of 2 will be the minimum computed, basEtd on our. ;'present estimate of tie angle of internal friction, and a slope `, of 4:1 (hoizontal to vertical). We recommend that the outslope ' of the pile be constructed at 4:1 for several reasons. In our past experience with the Highway Department and other agencies, we have found that it is passible to operate planting and mowing equipment on slopes of 4:1; However, as the slope steepens, it is becomes very difficult to operate machinery. There is suf- fient area and the total volume of spoil involved is relatively small. For these reasons, if at all possible, we suggest main- taining a maximum outslope of 4:1. The top of the pile should be graded to provide drainage outward over the entire area of the pile in order to reduce the risk of water standing on too of the pile. based on present plans of production, the maximum height of pile will be on the order of 35 feet. The maximum height may be less, depending upon the amount of volume reduction from compzction and the actual physical characteristics of the waste material. i 9. We recommend that a positive surface drainage ditch system be ` .installed completely around the periphery of the proposed disposal .' area. Considering the location of the site the chance of infiltra- tion of wa er rpm eit er surface or below-aroun sources is ow, proviaea a nsfalled a~ the time the phis developed. Considering the sma ra e or pro u n it may be desirable to construct the drainage facilities in a stage-manner in order to have sufficient volume of waste materials to develop the desirec. contours. ADDITIONAL IP1VcSTIGATI0N5 This investigation was preliminary in nature and limited because of avaiiabili~y of the refuse material. `LN'hen the plant is in operation, we suggest that sample of the plant produced refuse materials be obtained and `r 1, F~ \.