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_ �•_,--- `� - �� .tom: � . :a _ <br /> � t <br /> Union lee Company - Weber Street <br /> Pf:ase if- Report of findings <br /> Page 6 <br /> rare coarser grained sediments, it is a typical overbank to back swamp deposit of a <br /> large river system. <br /> Clay B is underlain by Sand 2, which is a blue-gray, fine to medium grained, <br /> 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 wells onime <br /> portions of large river systems. Sand 2 was penetrated in only two (2) <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 hun- <br /> dred feet. We have not explored them, however. <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 11 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 /> appear to be present in the first aquifer(Sand 1). <br /> r Ground water flow direction in the Sand 1 aquifer is approximately S 45 degrees, E at <br /> approximately t ) otper <br /> ef slat / Ground • <br /> r eleva- <br /> tions wrnouredatwo separatetimsfor this site. 42/90 and 419/91Results <br /> were similar each time(Plate 3). <br /> Water levels were measured on 4/2190, 3/2/91 and 4/19/91 by Henkle &Associates <br /> personnel at this site. Depths to water,collar elevations and ground water elevations <br /> or these measurement events are shown in Table 1. Our findings are similar to <br /> elevations measured by personnel of other companies that took 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-413 is screened in Sand 2, which is the secondaquifer <br /> at the <br /> s iteacehe <br /> ow <br /> piezometric surface in Sand 2 was about three feet (3 ) P <br /> F r ze th at ti me, however, the surface s <br /> Sand 1 in March 6 feet.169This is about 16 feet below the p ezometricsuet <br /> surface Sand 1. <br /> an elevation <br />