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CRYSTAL CREAMERY - STOCKTON WKA No 1628 01 March 17, 1994 Page 4 On December 17 and 18, 1992, three monitoring wells were installed to depths of 40 feet at the locations shown on Plate 2 Ground water was encountered at approximately 26 feet below grade during drilling Test results revealed no detectable TPH-gasoline or BTEX concentrations in the soil samples collected during drilling Test results of the water samples collected from these three wells revealed TPH-gasoline in wells MW2 and MW4 at 69 ug/f and 11,000 µglf, respectively Benzene concentrations in the samples from MW2 and MW4 were 0 51 k.gle and 1,100 Ag/P, respectively TPH-gasoline was not detected in well MW3, only trace toluene was encountered in this well Ground water measurements taken in February 1993 indicate ground water remains at 26 feet below grade and is flowing to the north and east with a hydraulic gradient of 0 002 ft/ft Results of this investigation may be found in our Soil and Ground Water Investigation Report, dated February 25, 1993 A summary of analytical results for soil and water samples collected by WKA are included as Tables 2 and 3, respectively On December 21, 1993, the four monitoring wells were re-sampled Analytical results revealed TPH-gasoline concentrations of 7,300 µg/f in well MW4, 230 Ag/P in well MW3, <50 Ag/P in well MW2, and a sheen of product in well MW1 Ground water measurements indicate ground water is flowing to the east with a hydraulic gradient of 0 0007 ft/ft Results of our sampling may be found in our January 27, 199Y Quarterly Status Report A summary of analytical results is included in Table 3 Site Vicinity The Chase Chevrolet property located to the east of the site at 423 North Madison Street is reported to have soil and ground water contamination as a result of leaking underground fuel storage tanks This property covers two city blocks between Fremont Street to the north and Lindsay Street to the south and Van Buren Street to the west and Madison Street to the east The soil and ground water contamination is reported to be located beneath two areas of the Chase Chevrolet property near the northeast corner of Fremont and Madison Street, and near the UUALL CE KUML H c61 pap r Er ASSOCIATES INC