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PROBLEM ASSESSMENT REPORT <br /> Moretand Court Shell <br /> 7700 Moreland Court,Stockton,California <br /> ' Delta Project No 4088-146 <br /> Page 8 <br /> TABLE 5 <br /> Chemical Analysts of Soil Samples Collected <br /> From Soil Borings Drilled on August 8, 1989 <br /> Concentrations in parts per million (ppm) <br /> Sample Date Depth Ethyl- Total <br /> Number Collected (ft) TPH Benzene Toluene benzene Xylenes; Leada <br /> SB-7 08/08/89 115 <0 001 <0001 0 008 <0001 0 002 --- <br /> SB-7 08/08/89 265 <0 002 <0002 0 011 <0002 <0 002 40 <br /> SB-8 08/08/89 165 <0 001 <0001 0 004 <0001 <0 005 40 <br /> SB-8 08108/89 265 <0 001 <0001 <0 001 <0001 <0 001 10 <br /> 'Concentrations in milligrams per kilograms (equivalent to ppm) <br /> Soil boring SB-7 was located approximately 15 feet from the product line sample location PL-5 (Figure 3) <br /> and was advanced to a total depth of 315 feet Soil sample PL-5, collected previously during the tank <br /> closure activities at a depth of 4 feet below the ground surface, contained 1,130 ppm TPH as gasoline Two <br /> soil samples from soil boring SB-7 were collected at 115 and 265 feet below grade and were submitted for <br /> chemical analysis Chemical results for soil boring SB-7 indicated concentrations of TPH were below the <br /> analytical method detection limit of 0 002 ppm <br /> Soil boring SB-8 was dnlled within 5 feet of tank sample location TS-2 (Figure 3) and was advanced to a <br /> depth of 26 5 feet Soil sample TS-2, collected previously at the base of the tank excavation, contained <br /> 1,030 0 ppm TPH as gasoline Soil samples were collected from soil boring SB-8 at 16 5 and 26 5 feet below <br /> grade and contained concentrations of TPH below the analytical method detection limit of 0 001 ppm <br />