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l J <br />• <br />• <br />fluence the stability of any waste pile of small to moderate <br />height. <br />Based on the results of the ground water measurements, <br />stability analyses have generally been run assuming no ground <br />water within the section being analyzed. This implies that <br />existing ground water conditions will be maintained or im- <br />proved in the future. This will require the implementation of <br />suitable surface water control systems and long-term moni- <br />toring of ground water conditions to insure that the ground <br />water conditions assumed for analyses are met in practice. <br />Field permeability tests were performed in one <br />boring within the crushing and screening Ievel fill (B-3A) <br />and in three borings located in colluvium below this fill <br />(B-5, B-6, and B-7). The results of these tests are sum- <br />marized in Table A-1. Laboratory permeability tests were <br />performed on "undisturbed" and recompacted samples as <br />summarized in Table B-2. The results of all these tests <br />indicate that the colluvium has a low permeability, <br />generally in the range of 10-5 to 10-~ cm/sec. This is <br />consistent with the clayey character of this material. <br />No water quality samples were collected for chemical <br />analyses during our field investigation since no water was <br />encountered during the installation of the piezometers. The <br />fact that low water levels were measured in a number of the <br />piezometers subsequent [o our field investigation may be a <br />result of slow seepage through the relaCively impermeable <br />soils or possibly due to a small amount of water remaining <br />in the bottom of the piezometers due to the falling head <br />tests. Cotttinued monitoring of ground water levels should <br />clarify the origin of this water. <br />It may be advisable to install one or two monitoring wells <br />in[o the first aquifer within the bedrock. However this <br />installation was not in the scope of work for this part of <br />the project. <br />_ g _ cco+~rooo conwinac. iNC. <br />