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ME <br /> QUAR'T'ERLY MONPTORING REPORT,FOURTH'-UARTFR OF 1990 <br /> 7910 Lrnver Sacramento Road,Stockton,California <br /> Shelf WIC No.204-7524.0&08 <br /> Delta Project No.40-68-147 <br /> Page 4 <br /> r <br /> i � <br /> 3.2 Ground Water Chemistry <br /> r i s Ground water samples a-ere collected from monitoring wets (MW-1, MW-2, and MW-3) on <br /> x <br /> October 11,1090,and were,submitted to a California-certified laboratory for analysis of benzene,toluene, <br /> t 4 eth lbenzene and xylenes and total petroleum hydrocarbons H Monitoring well locations are <br /> s shown in Figure 2, and the chemical results are presented in Table 3. Certified laboratory reports are <br /> s presented in Appe+dix A. Ground water samples wiei again be collected for chemica analysis of <br /> i=x <br /> concentrations of BTEX and TPF:in January 1991. <br /> �r TABLE 3 <br /> Chemical Analyses of Ground Water Samples <br /> V.1 Concentrations in per u (ppb)micro rams r literz <br /> g � <br /> iS <br /> { <br /> Monitoring Date S'hyl- <br /> �- Well Collected TPH Benzene Tolurne benzene mens <br /> a <br /> MW-1 08/15/89 <100 0.6 <2.0 <2.0 <20 <br /> 05/11/90 <30 ',1 <030 <030 <0.30 <br /> 10/11/90 <A c x.30 <0.30 <030 <0.30 <br /> M'N-2 08115189 <100 0.3 <2.0 <2.0 <2.0 <br /> 05/11190 <30 <0.30 <0.30 <0.30 <0.30 <br /> F` 10/11M <30 <030 �<0.30 <030 <0.30. i <br /> ' MW-3 0811589 <100 0.3 <2.0 <2.0 <2.0 <br /> 3 05/11190 <30 0.38 <030 <0.30 <030 j <br /> . r 10/11/90 <30 <0.30 <0.30. <0.30 <0.30 1. <br /> x �s , Chemical resui6'o;the ground water samples collected on October 11,1990,indicated that BTEX and TPH <br /> concentrations were below the analytical method detection Iimits in all three monitoring wells. <br /> s� P <br /> MEN ills <br /> r'S, <br />