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FINAL REMEDIATION PLAN <br /> Shell Oil Company <br /> 620 West Charter Way,Stockton,California <br /> Delta Project No 40.M586 <br /> Page 7 <br /> During the week of November 13, 1989, soil samples were collected from beneath the three former <br /> underground storage tanks and from along the former product distribution lines Analytical results for soil <br /> samples collected during the tank and line excavations are summarized in Table 2 Soil sample locations <br /> are illustrated in Figure 3 <br /> Also during the week of November 13,1990,soil samples were collected from the base of the new tank vault <br /> Analytical results for soil samples collected in the new tank vault are summarized in Table 3, and sample <br /> locations are indicated in Figure 3 Additional soil samples were collected in the areas of the former waste <br /> oil tank,sump,and service bay hoists Analytical results are summarized in Table 4 and soil sample locations <br /> are illustrated in Figure 3 <br /> TABLE 2 <br /> Former Tank Excavation Soil Samples <br /> Concentrations in milLgrams per kilogram(equivalent to parts per million) <br /> Sample Depth(feet Ethyl- <br /> No below grade) Benzene Toluene benzene Xyl T Ir <br /> N End 14 66 170 74 320 3,200 <br /> Tank 1 <br /> S End 14 022 0 074 <0 05 0 098 14 <br /> Tank 1 <br /> N End 14 0 053 0 071 0 092 0 53 42 <br /> Tank 2 <br /> S End 14 <0 05 0 068 <0 05 0 087 14 <br /> Tank 2 <br /> N End 14 97 200 100 550 6,100 <br /> Tank 4 <br /> S End 14 29 120 48 230 '1,700 <br /> Tank 4 <br /> NE Corner 195 110 290 100 500 7,100 <br /> Old Excav <br /> 3 <0 05 <0 05 <0 05 0 12 <05 <br /> Lne #1 <br /> 3 <0 05 0 087 0 098 31 12 <br /> Line #2 <br /> 3 <0 05 0 058 027 63 64 <br /> Line #3 <br /> °Total petroleum hydrocarbons as gasoline <br />