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Problem Assessment Report November 20, 1990 <br /> Fire Engine Company No. 2, Stockton, California AGS 38009-2 <br /> The concentrations of TPHg in samples from boring B-1, S-25-BI and S-35-B1, were 260 <br /> and 350 ppm,respectively. TPHd was detected at 15 ppm in sample S-25-B1 and was below <br /> ® detection limits in sample S-35-BI. The concentrations of BTEX compounds in sample S- <br /> 25-BI were 4.7,21, 18,and 1.10 ppm,respectively. The concentrations of BTEX compounds <br /> in sample S-35-BI were 11, 40, 9.0, and 53 ppm,respectively_ :ne concentration of organic <br /> lead was below detection limits for both samples. These levels of hydrocarbons are <br /> generally cons"dered to warrant remediation. j <br /> The soil sample collected immediately above ground water in borings B-2 through B-8 were <br /> submitted for analysis of TPHg and BTEX. Soil samples collected from borings B-2 and <br /> B-3 were also submitted for organic lead. Concentrations of TPHg,BTEX,and organic lead <br /> were below detection limits in the samples collected from borings B-2 through B-8 (Table <br /> �y 8). ;..e concentrations of hydrocarbons in soil are shown on the two geologic cross sections <br /> (Plate's P-22 and P-23). <br /> Hvdrocarhnns in Water <br /> After the wells were constructed, they were developed, purged, and sampled (see Table 4 <br /> for dates of theses field events). Ground-water samples were then collected from the wells <br /> and subjectively analyzed for hydrocarbons using methods discussed in Appendix B. Results <br /> 21 <br /> - AOPAOOF Gea7Systerns <br />