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Limited Environmental Investigation <br /> ^� ARCO Service Station No. 6100,Tracy, California July 1G, 1990 <br /> AGS 30041-1 <br /> In the 10 foot sample from boring B-2, (S-10-B2), BTEX concentrations were detected at <br /> S.S,43, 13, and 76 ppin,respectively. Lower BTEX concentrations were detected in the 20 <br /> -; foot sample (S-20-B2); 0.44, S.7, 3.71, and 23 ppm, respectively. In the 30, 35 and 40 foot <br /> samples(5-30-B2,S-35-B2,and S-40-B2),hydrocarbons were below detection levels. BTEX <br /> concentrations were detected below 1.0 ppm in boring B-3 in samples collected at 10, 15, <br /> i R <br /> 20, and 25 feet. <br /> Soil samples with the highest PID readings near the present leaded gasoline tan;.s (S-30-B1 <br /> t and S-10-133) were submitted to the laboratory for analysis of organic lead. Organic lead. <br /> i' € <br /> was not detected in either sample. <br /> i <br /> ir. <br /> Results of laboratory analyses of soil samples collected from borings B-4 and 13-5 in the area <br /> of the proposed tank cavity from 25 and 30 feet, indicated TPHg concentrations below <br /> detection levels and BTEX concentrations below 1.0 H <br /> r- ppm. Hydrocarbons rbons were detected in <br /> k <br /> E the samples collected at 15 and 20 feet from the two borings. In the 15 and 20 foot samples <br /> from boring B-4 (S-15-B4 and S-20-134), TPHg concentrations were 180 and 810 ppm, <br /> respectively, and benzene was less than 1.0 <br /> Ppm- Toluene, ethylbenzene, and total xylene <br /> f <br /> r_ isomers ranged from 1.6 to LL ppm, 1.45 to 12 ppm,and 6.2 to 76 ppin,respectively. In the <br /> 15 and 20 foot samples from boring B-5 (S-15-B5 and S-20-B5).TPHg concentrations were <br /> '( '� APR11490' Ge®SysPe177s <br />