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11!1:11 1011PI11I111 1121 :1 <br /> 3uly 16, 1990 <br /> limited Environmental Investigation A(;$ 30{}41-1 <br /> ARCO Service Station No. 6100, Tracy. California <br /> Four soil samples were collected from the drill cuttings. At the request of ARCO, the <br /> samples were submitted to the GSX Lolrern Facility in Buttonwillow, <br /> California, fora ` <br /> profile analysis. ARCO was responsible for the disposal of the drill cuttings. <br /> LABORATORY RESULTS <br /> in soil samples are presented in Table 2. The sample <br /> The concentrations of hydrocarbons <br /> number represents the depth below grade that the sample was collected and the boring <br /> number. Hydrocarbons were detected to 45 feet in boring B-1, 20 feet in boring B-2, and <br /> 10 feet in boring B-3. TPHg concentrations ranged from below detection limits to 1,900 <br /> parts per million (pprn) in samples collected from these three borings. In tha 30 foot <br /> sample from boring B-1 (S-30-B1), BTCX compounds wire detected at 11, 67,26 and 150 <br /> -; <br /> pere below 1.0 ppm in the 45 <br /> pm, respectively. BTEX concentrations w <br /> foot sample (S�4 - <br /> B3),except total xylenes which were detected at 1.3 ppm. in sample. S-50-B1 and 5-55-81, <br /> hydrocarbons were below detection levels. <br /> i <br /> f <br /> - illF <br /> 8 <br /> APAPAOd 0005. VI"S <br />