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Mr. Michael Walton -� <br /> Walton Engineering <br /> March 20, 1998 <br /> TABLE 1 <br /> LABORATORY RESULTS OF SOIL SAMPLE ANALYSES <br /> UNDERGROUND FUEL STORAGE TANKS <br /> 3300 WEST LANE,STOCKTON, CALIFORNIA <br /> to i"otal <br /> a <br /> S`am le Number- <TPH b Beniene " Tohiene' <br /> P b benzene" Xylenes. Leah <br /> Storage Tanks <br /> S-17-T 1 n ✓83 0.750 <0.050 0.640 1.40 22.000 ✓ 6.7 <br /> 5-16-T1s <br /> <0.010 <br /> �<1.0 �/ <0.005 <0.005 <0.005 <I.0 8.1 <br /> S-13-T2n <1.0 <0.005 <0.005 <0.005 <0.010 na 7.9 <br /> 5-16-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 , <br /> S-17-T3s <L0 ✓ <0.005 <0.005 <0.005 <0.010 na na , <br /> Fuel Dispensers Fb 1 - l <br /> S-4-FD 1 1.2 ✓ <0.005 <0.005 <0.005 0.020 na na ` <br /> S-3-FD2 -'<I.0 0.024 0.099 0.013 0.150 na nark r^nrT1 �';c <br /> S-3-FD3 <br /> <1.0 ✓ <0.005 <0.005 <0.005 <0.010 na na <br /> S-4-FD4 - <1.0 ✓ <0.045 <0.005 <0.005 <0.010 na na <br /> S-3-FDS <br /> <1.0 /<0.005 <0.005 <0.005 <0.010 na na <br /> 5-4-FD6 <br /> <1.0 - " <0.005 <0.005 <0.005 <0.010 na na <br /> Product Pipelines <br /> S-4-PL 1 <1.0 <0.005 <0.005 <0.005 <0.010 na na N 0 <br /> S-3-PL2 <1.0 �"<0.005 <0.005 <0.005 <0.010 <1.0 na r. ` <br /> S-4-PL3 <1.0 V<0.005 <0,005 <0.005 <0.010 <1.0 na 1 ,, <br /> <1.0 <0.005 <0.005 <0.005 <0.010 <1.0 na , r <br /> S-4-PL4 - . <br /> S-3-PLS <br /> <1.0 _ <0.005 <0.005 <0.005 <0.010 <1.0 na <br /> Laboratory results of the soil samples are reported in milligramsikilogram(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 /> GR,4YLA,,VD ENVIRONMENTAL <br /> Grat land 022-!60.trr <br />