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1 <br /> 1 <br /> that the local groundwater gradient flows in a northeasterly <br /> direction. Figure 4 shows the water-level data collected and <br /> interpreted contour lines <br /> 1 <br /> 7 .0 LABORATORY ANALYSES <br />' The samples were sent to McCampbell Analytical Inc . of Pacheco, <br /> California, a state-certified laboratory, and analyzed for: <br />' TPHg and TPHd using EPA Method 8015M; <br /> • SEX using EPA Method 8020; and <br /> • Oxygenated volatile organic compounds (9 oxygenates) <br />' using EPA Method 8260 <br /> The samples were analyzed on a normal 5--day turnaround basis . <br />' 7.1 Laboratory Analytical Results <br /> The laboratory analytical results are summarized in Table 1 and <br />' Figure 3 . Laboratory certificates are included in Appendix A. <br /> The results are as follows: <br /> Analysis of groundwater samples indicated that : <br /> Petroleum Hydrocarbons <br /> • TPHg concentrations were less than 50 . 0 qg/l (not detected) . <br /> • TPHd concentrations ranged from less than 50 0 qg/1 (not <br />' detected) to 210 4g/l. <br /> • Benzene concentrations were less than 0 5 4g/l (not <br /> detected) <br /> • Toluene concentrations were less than 0 5 4g/l (not <br />' detected) <br /> • Ethylbenzene concentrations were less than 0 . 5 4g/l (not <br /> detected) . <br />' Xylenes concentrations were less than 0 5 4g/1 (not <br /> detected) <br /> Oxygenated Volatile Organic Compounds <br />' Di-isopropyl ether concentrations were less than 1 0 ktg/l <br /> (not detected) <br /> 4 <br /> 1 <br />