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Mr Michael Walton • <br /> Walton Engineering <br /> March 20 1998 <br /> TABLE I <br /> LABORATORY RESULTS OF SOIL SAMPLE ANALYSES <br /> UNDERGROUND FUEL STORAGE TANKS <br /> 3300 WEST LANE, STOCKTON, CALIFORNIA <br /> Sample Number TPHg Benzene Toluene EthyL- Total TPHd Total <br /> benzene Xvlenes Lead <br /> Storage Tanks $��0 <br /> S-17-T I n 83 0 750 <0 050 0 640 1 40 22 000 6 7 NO <br /> S-16-T]s <1 0 <0 005 <0 005 <0 005 <0 010 <10 8 1 <br /> S-13-T2n <10 <0 005 <0 005 <0 005 <0 010 na 7 9 <br /> S-16-T2s <1 0 <0 005 <0 005 <0 005 <0 010 na <5 0 <br /> S-14-T3n <1 0 <0 005 <0 005 <0 005 <0 010 na na Ue <br /> S-17-T3 s <10 <0 005 <0 005 <0 005 <0 010 na na <br /> Fuel Dispensers Fol 4 <br /> S-4-FD 1 1 2 <0 005 <0 005 <0 005 0 020 na na <br /> S-3-FD2 <10 0 024 0 099 0 013 0 150 na na FP M'T$-( J)JIL> <br /> S-3-FD3 <1 0 <0 005 <0 005 <0 005 <0 010 na na w 5 <br /> S-4-FD4 <1 0 <0 005 <0 005 <0 005 <0 010 na na N+� <br /> S-3-FD5 <1 0 <0 005 <0 005 <0 005 <0 010 na na 1" <br /> S-4-FD6 <1 0 <0 005 <0 005 <0 005 <0 010 na na `1 <br /> . Product Pipelines <br /> S-4-PL 1 <t 0 <0 005 <0 005 <0 005 <0 010 na na 1� <br /> S-3-PL2 <1 0 <0 005 <0 005 <0 005 <0 010 <1 0 na r <br /> S-4-PL3 <1 0 <0 005 <0 005 <0 005 <0 010 <1 0 na <br /> S-4-PL4 <1 0 <0 005 <0 005 <0 005 <0 010 <1 0 na <br /> S-3-PL5 <1 0 <0 005 <0 005 <0 005 <0 010 <1 0 na IJ r <br /> Laboratory results of the soil samples are reported in milligrams/kilogram(parts per million) <br /> TPHg=Total Petroleum Hydrocarbons in the range of gasoline <br /> TPHd=Total Petroleum Hydrocarbons in the range of diesel fuel <br /> <=Less than the laboratory method reporting limit <br /> na=not analyzed <br /> The laboratory analytical results of soil samples collected from the two sidewalls and base of the <br /> area of overexcavation indicated that concentrations of TPHd were significantly reduced by the <br /> excavation work TPHd was not present in the sidewall soil samples collected from approximately <br /> 17 feet below ground surface on the western sidewall, while only a low concentration of TPHd was <br /> detected at approximately 19 feet on the northern sidewall (Table 2) The soil sample collected from <br /> the base of the open excavation at approximately 24 feet below ground surface was found to contain <br /> slightly elevated concentrations of TPHg and xylene isomers and a residual concentration of TPHd <br /> at 230 ppm This residual concentration of TPHd, however, had been mitigated from an initial <br /> concentration of 22 000 ppm by the excavation work(Table 2) The laboratory reports for these soil <br /> . samples are presented in Appendix <br /> GRAYL4,VD E XVIRONMENT 4L <br /> Grav land 022-�60 trr 5 <br />