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�- <br /> o Installation of four additional soil borings and <br /> conversion into ground water monitoring wells. <br /> O collection and analysis of soil and ground water <br /> samples. <br /> o <br /> Surveying, development, and sampling of the ground <br /> water monitoring wells. <br /> O Performance of the necessary tests and analyses to <br /> determine aquifer parameters and characteristics. <br /> o Evaluation of the results of the field activitieser and <br /> laboratory analysis of soil and ground <br /> es- <br /> o Conduct of a feasibility study to evaluate <br /> alternative remedial technologies and/or measures to <br /> address the subsurface contamination at the site. <br /> o preparation of a technical report presenting the <br /> results and findings of the above activities and the <br /> appropriate recommendations. <br /> The investigative work was performedand in accordance with the <br /> requirements othe <br /> 4.0 sUWARy OF PREVIOUS FINDINGS AND RECOMMENDATIONS <br /> The findings and conclusions of the supplemental site <br /> investigation performed by Alton Geoscience from January <br /> + through September 1990 are presented below (Alton Geoscience, <br /> October, 1990) : <br /> o The predominant soil types at the site are clay-silt <br /> mixtures with lenses of sand and gravel. <br /> o The average depth to ground water was approximately <br /> 5.8 feet below grade, which could vary with seasonal <br /> conditions. Figure 3 shows a ground water elevation <br /> map based on data from August 1990- <br /> o The general ground water flow direction is to the <br /> north/northwest, with an average gradient of <br /> 0.005 foot per foot. Previous ground water <br /> monitoring at the site indicated changes in ground <br /> water flow direction. These changesin <br /> V ong <br /> direction are probably due to past <br /> activities. <br /> 3 <br />