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Geological Technics Inc. Page 6 <br /> C&B Equipment <br /> Monitoring Well Installation Report <br /> I:r Project No.336.2 <br /> November 13, 1995 <br /> 3.0 RESULTS OF SUBSURFACE INVESTIGATION <br /> rl The results of this preliminary site characterization work are presented below. <br /> 3.1 Site Geology <br /> Based on sediments recovered in the split spoon sampler the soil profile of the site <br /> r.; was observed to generally consist of a clayey silt from the surface to approximately 7 <br /> feet with varying amounts of very fine grained silty sand. A very fine to fine <br /> silty/clayey sand unit was observed below the overlying clayey silt unit. This sand <br /> was underlain by a clayey silt layer in both MW-1 and MW-3. All wells terminated <br /> in to a silty sand at 20 feet. <br /> The sediments containing clay fines exhibited varying degrees of plasticity from non <br /> plastic and even friable to very plastic. The soil below a depth of ten feet was <br /> observed to be saturated with water (the water table stabilized at approximately 6.5 <br /> =_ feet after well development). The boring logs for the borings are attached in <br /> Appendix B. <br /> Generally no continuous fine grained silt or clay unit was observed in the vadose <br /> 3 zone that could potentially function as a barrier to the vertical migration of <br /> contaminants. <br /> 3.2 Site Hydrology <br /> On July 28, 1995 the three monitoring wells were measured for depth to <br /> groundwater by Del-Tech Geotechnical Support personnel. The average depth to <br /> water was measured to be 5.94 feet from the top of casing measuring point. The <br /> groundwater gradient and bearing of flow were calculated to be 0.0070 ft/ft flowing <br /> North 32° West respectively (Figure 3-Gradient Map). <br /> ' On September 28, 1995 the three monitoring wells were measured for depth to <br /> j groundwater by Del-Tech Geotechnical Support personnel. The average depth to <br /> water was measured to be 6.19 feet from the top of casing measuring point. The <br /> j groundwater gradient and bearing of flow were calculated to be 0.0056 ft/ft flowing <br /> North 18°West respectively (Figure 4-Gradient Map). <br /> >. This hydrologic behavior is consistent with what would be expected based on <br /> surface topography (Figure 1- Vicinity Map). <br /> �i <br /> :J <br /> i.-7 <br />