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� a�-w <br /> T <br /> z d F <br /> R0BI.VM ASSESSMENT REPORT <br /> Shen Service Station <br /> 7910 Lower Sacramento Reed,Stockton,Californin <br /> i Shmil WIC No.204.7514-0808 <br /> ( Delta Project No.4048-147 <br /> t ` Page 5 <br /> identified as SPIa and SPlb to SPSa and SP5b. A summary of the chemical results and laboratory data <br /> sheets are presented in Appendix D. The chemical analysis of the sail samples collected for We above-listed <br /> petroleum constituents detected the presence of gasoline and motor oil. Concentrations of TPH as motor <br /> P2 oil ranged from <10.0 to 103.0 ppm,and for gasoline from <30.0 to 92.0 Qpm. <br /> f � <br /> TABLE 2 <br /> Chemical Analysis of Soil Samples From <br /> Bottom of Old Tank Excavation <br /> Concentrations is tttilligrams per kilogram/mgtkg <br /> P-4 <br /> f I Sample Date Approximate Ethyl- <br /> t; - Collected Devth(feet) Benzene benzene Toluene Xylenes TPS <br /> T-1 12(10/88 15 <0.001 <0.001 <0.001 <0.001 <10.0 <0.05 <br /> ` T-2. 12(208 . 15 <0.001 <0.001 <awl <0.001 <10.0 <0.05 <br /> T-3 12120/88 15. <0.001 <0.001 <0.001 <0.001 <10.0 <0.05 <br /> z <br /> T-4 12(10!88 15 <0.001 <0.001 <0.001 <0.001 <10.0 <0.05 <br /> {' T-5 lZ20188 15 3.0 29-6 224 188.0 4,880.0a 0.13 <br /> T-6 12/20/88 15 2.77 33.9 32.1 187.0 4,790.02 0.46 <br /> T-7 12/10/88 15 <0.050 10.4 1.7 74.5 1,500.02 <0.05 <br /> -8 112/10/88 15 <0.005 0.095 0.130 0.470 120.Ob <0.05 <br /> T <br /> ry ; <br /> a <br /> aidentifted as gasoline . <br /> ' On January 7,1989,aper removal of the fuel dispensers,soil samples were collected from 2 feet below the <br /> surface of the pump islands. One soil sample was.collected for each pump island,and the samples were <br /> ii identified as T-1,T-2,and T-3. The locations of the sampling points are illustrated in Figure 2. These <br /> tai <br /> samples were submitted for chemical analysis of BTEX,TPH,EDB,and TEL The laboratory analytical <br /> results are presented in Table 3. Concentrations of TPH in soil samples T-1,T-2,and T-3 were 15.0,24.0, <br /> i ,' and 11,510.0 ppm.respectively. <br /> On January 25, 1989, following removal of the product lines,six soil samples were collected from 2 feet <br /> below the bottom of the product line trenches. One soil sample was coilected for every 20 feet of product' <br /> line trench, and the samples were identified as PL-4 through PL-9. The sampling pain: locations am <br /> i <br /> E _ <br />