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r - <br /> PRELIMINARY REPORT <br /> SUBSURFACE HYDROCARBON INVESTIGATION <br /> i <br /> KNOWLES GAS STATION <br /> IJ 1140 WEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> s �88 <br /> c _ <br /> July 21, 1988 <br /> P <br /> INTRODUCTION <br /> This preliminary report presents the results of Groundwater <br /> F , <br /> s Technology, Inc. 's (GTI's) subsurface investigation for the above <br /> referenced site (see Figure 1, Site Location Map) . GTI was <br /> contracted by Mr. Ted Knowles following a request for an addi- <br /> tional subsurface investigation by the California Regional Water ! <br /> Quality Control Board, Central Valley Region (CRWQCB-V) . This <br /> report briefly summarizes GTI's. previous work at the site and <br /> presents the results of recent work steps including drilling of F <br /> � 4 soil borings and groundwater monitoring and sampling in June of <br /> 1988. . This preliminary report was written to comply with the <br /> guidelines set forth. by the CRWQCB-V and the San Joaquin Local <br /> Health District (SJLHD) regarding consultant reports for <br /> subsurface assessments. <br /> n f <br /> BACKGROUND <br /> fir; r, <br /> SITE SETTING AND HISTORY <br /> r ' The Knowles Gas Station is located within a commercial <br /> district of .northern Stockton, on. the southwest corner of the <br /> t <br /> intersection of West Hammer Lane and Pacific Avenue (Figure 1). <br /> ;T <br /> P <br /> � y <br /> F,, <br />