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PROBLEM A53F.SSMENT RRPQRT Shell Service station -.� 7910 Lower Sacramento Road,Stockton,California r Shell WIC No.204.7524.OM Delta Project No.40-88-I47 Page 8 w ° 3.2 Soil Chemistry Soil samples were collected at S-foot-depth intervals and screened with a portable photoionization detector (PID) for total organic vapors. Selected samples were submitted to a California-certified laboratory far t.. determination of TPH.B7EX.and total lead concentrations. The results of these analyses are presented in Table 4. The certified laboratory reports for soil boring samples are presented in Appendix B. I-J TABLE 4 Chemical Analyses of Soil Samples CoNected From Soil Borings Concentrations in Milligrams Per Kilogram mg/kg Depth Below Grade Total I iJ �2myle Location eet TPH Benzene Toluene Ett ylen xylenes Lead MW-1 S6.5 <0.1 <0005 <0.005 <0.005 <0.005 NAe s MW-2 56.5 <0.1 <0.005 <0.005 <0.045 <0.005 NA . � MW 565. <0.1 <0.005 <0.005 <00)5. <0.005 NA SB-1 11.5 40.2 <0.002 <0.002 <0.002 <0.002 NA l 41.5 <0.2 <0.002 <0002 <0.002 <0.002 NA ,. SB-2 115 <0,2 <0.002 0.003 <0.002 0.006 NA. -41.S <0.2 <0.002 <0.002 <0.002 0.004 NA S9-3 16-5 0.2 0.003 0004 0.003 9 0 6 , 3.0. 26.5 0.3 0.005. 0.011 0.047 0.017 4.0 36.5 <0.1 <0.005 <0.005 <0.005 <0.005 10 46.5 <0.1 <0.005 <O.QOS <0005 <0.005 1.0 56.0 <0.2 <0005 <0005 <0.005 <0.005 <1.0 ` i allot analyzed for this constiiuent. Concentrations of BTEX in samples collected from 11.5 to 30 feet below the surface ranged from less than -0.002 to 0:017 ppm Concentrations of TPH ranged from less than 0.2 to 0.3 ppm. Concentrationq of B'1'1~X 3 - -and TPH in samples.collected from 365 to 565 feet below the:surface were less than the laboratory �. analytical method detection limits. z s to n