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3 y <br /> Utrion Ice Compatry - yyeber Street <br /> 11hase 11- Report of Fitrelutgs <br /> Page G <br /> t.x <br /> i <br /> a typical overbank to back .swamp deposit of a <br /> rare coarser grained sediments. it is <br /> K large river system. <br /> Clay 13 is underlain by Sand 2, which is a blue-gray, Cine to medium grained, <br /> R: micaceous sand. The full thickness of this sand is not known. This type of sand is a <br /> typical river channel deposit deposited in scour fills and in the lower flow regime <br /> portions of large river systems. Sand 2 was penetrated in only two (2) wells oil the <br /> property (MW-4D and MW-3S); it probably is continuous over the entire site. <br /> Lithologies similar to those discussed above underlie the site to depths of several liun- <br /> dred feet. We have not explored them, however. <br /> 1 . <br /> GROUND WATER <br /> First ground water was found by the drill at a depth of 13 to 19 feet at this site. Pres- <br /> ence of ground water coincided with the basal contact of Clay A/upper contact of Sand <br /> [ 1 in every well drilled at this site. The piezometric surface of the water, as measured in <br /> the monitor wells, is at 1 i to 12 feet below the well collar. This piezometric surface is <br /> two to five feet (2-5') higher than the basal contact of Clay A; slight artesian conditions <br /> k' appear to be present in the first aquifer (Sand 1). <br /> Ground water flow direction in the Sand 1 aquifer is approximately S 45 degrees, E at <br /> + approximately one (1) foot of fall per 240 feet of plan distance. Ground water eleva- <br /> tions were contoured at two separate times for this site; 4/2/90 and 4/19191. Results <br /> were similar each time (Plate 3). <br /> r <br /> I <br /> Water levels were measured on 4/2/90, 3/2/91 air! 4/19/91 by Henkle& Associates <br /> 1 personnel at this site. Depths to water, collar elevations and ground water elevations <br /> I for:hese measurement events are shown in Table 1. Our findings are similar to <br /> elevations measured by personnel of other companies that tool: the ground water <br /> samples at various times at this site. The gradient direction apparently does not shift <br /> with the seasons at this site. <br /> Monitor Well-4D is screened in Sand 2, which is the second aquifer at the site. The <br /> 1` piezometric surface in Sand 2 was about three feet (3') below the piezometric surface in <br /> Sand 1 in March of 1990. Since that time, however, the surface has dropped to about <br /> an elevation of 16 feet. This is about 16 feet below the piezometric surface in Sand 1. <br />