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v3; <br /> PROBLEM ASSESSMENT REPORT <br /> Shea Servioo Station <br /> 7910 I ower Sacramento Road,Stockton,California <br /> Shell WIC No.204-7574-pEOE; <br /> Dela Project No.4(1.48-147 <br /> Page 1a <br /> 3.5 Ground,Water C�he��y <br /> Ground water samples were collected from monitoring wells MW-1,MW-2,and MW-3 on August 15,1989 <br /> ii <br /> and May 11, 1990,and were submitted to a Callfornia-certified laboratory for analysis of BTEX and TPH. <br /> Monitoring well locations are shown in Figure 2, and the chemical results are presented in Table 6. <br /> ' Certified laboratory reports are presented in Appendix G <br /> �..i Chemical analyses of the ground water samples collected on August 15, 1989, indicated the presence of <br /> r ON benzene at concentrations of 0.6,0.3,and 0.3 parts per billion(ppb)in monitoring well.;MW.1,MW-Z,and <br /> .r MW-3,respectively. Chemical analyses of the <br /> ys ground water samples collected on May 11,1990.indicated <br /> tho presence of benzene at concentrations of 1.1,<0.3,and 0.38 ppb in monitoring wells MW-1,MVI-2,and <br /> ft <br /> MW-3,respectively. Concentrations of toluene,et benzene,xylenes.and TPH were OR below the detection <br /> f limits. <br /> a <br /> TAELE 6 <br /> Chemical Analysis of Ground Water Samples <br /> Monitoring Date TPHBente a Toluene Htlr�(ben¢tae Xykoes <br /> Wel! eeted ftmm) lP�bl -CBP�L <br /> f fP2� 222 <br /> ` MW-1 <br /> . . 08115/89. <0.1 0.6 <2.0 <20 2 <br /> 05/11M <0.030 LI < 0 <br /> .� <03D <0.30 <0.30 <br /> MW-2 o81L5189 <0.1 ` 0.3 . <br /> . 05/11189 <0.03� <20 <20 <2.0 i <br /> < 3 0030 <030 <030 <br /> v hitiV-3 08/LS/84 <0.1 0.3 <10 <20 <br /> a <br /> 051111'90 10.030 038 <2 0 <br /> F; <a3o <0.30 <br /> 4 x; <br /> hhhayiii _ _ - -4.0 DISCii55sON-O <br /> s, The extent of petroleum ydrocarbons in soils and ground water beneath the site is discussed below. <br /> X11 <br /> - <br /> �r 11 Extent or Petroleum H dracprbon Constlttients in Soils -- - --- -- -- --- <br /> Elft <br /> Laboratory analysis of Soil sample T-3, collected fmin 4 feet beneath the northwest am <br /> ' p p island on' <br /> January 7.1989,indicated that the TPH concentration was 1,510.0 ppnt. In order to evaluate the vertical <br /> extent oftroleum <br /> s 1 J Pe hydrocarbons at this location,soil boring SB-1 was advanced on August 10, 19$9. The <br /> w <br /> concentrations of BTEX and TPH in soil samples collected from SB-I at depths of 11.5 and 41.5 feet below <br /> t` the surface were below the laboratory analytical method detection limits. <br /> h. <br /> r _ <br />