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nQ <br /> REC 10C, lwh LEVINE•FRICKE <br /> NOV 2 2 <br /> September 26, 1989 � 'iirLF 1396 <br /> WORK ORDER <br /> GROUND-WATER QUALITY' INVESTIGATION <br /> SUNBORO DEVELOPMENT CORPORATION PARCEL B <br /> TRACY, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> This Work Order was prepared for an investigation of ground-water <br /> quality at the Sunboro Development Company (Sunboro) parcel B, <br /> located southwest of the intersection of Byron Road and Corral <br /> Hollow Road in Tracy, California ("the Site;" see Figure 1) . A <br /> soil investigation conducted in 1988 by Terrestrial Technology, <br /> Inc. (TTI) found evidence of petroleum in soils at the northern <br /> boundary of the Site. The TTI investigation included a row of <br /> nine soil borings along a line parallel to the property line, at <br /> a distance of 125 feet south of the property line. Petroleum was <br /> not encountered on the property by TTI in these borings. The <br /> findings of the TTI investigation are summarized in their report <br /> dated October 27, 1988 . Petroleum was encountered in a boring 11 <br /> feet away from the property line, but not in borings which were <br /> located 28 and 53 feet away from the property line. <br /> To supplement the data obtained by TTI, Levine•Fricke was <br /> retained by Sunboro in 1989 to drill 13 soil borings along the <br /> northern property line. Petroleum was visible and detected in <br /> soil samples in three of these 13 borings. The locations of the <br /> TTI and Levine-Fricke soil borings are shown on Figure 2 . The <br /> three Levine-Fricke borings in which petroleum was encountered <br /> are borings D, J, and L. Ground water was encountered in these <br /> borings at depths of around 10 feet below ground surface. <br /> Petroleum was found at depths ranging from about 5 to 12 feet, <br /> although TTI indicated that petroleum was present at about 18 <br /> feet below ground surface. <br /> Characterizations of the petroleum encountered in soil samples <br /> had indicated that the material waslmainly a heavy tar-type, with <br /> lesser portions of a lighter diesel.'-type material. <br /> 2 .0 OBJECTIVE <br /> The objective of this investigation, is to assess the impact of <br /> petroleum on site ground water. Based upon the results of this <br /> investigation, alternatives for ground-water monitoring and <br /> possible remediation will be evaluated. <br /> _1_ <br />