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to 0.043 mg/kg. Toluene was detected, primarily in the soil samples collected from <br /> Borings SB-10 through SB-13, which were drilled east of and within the former excavated <br /> area as shown on Figure 4. <br /> • Analysis of the groundwater samples detected up to 4.5 micrograms per liter (ug/1) <br /> toluene, 1.2 ug/1 ethylbenzene and 2.0 ug/l total xylenes in the samples from SB-7, SB-12 <br /> and SB-13. The concentrations of these aromatic hydrocarbons detected in the samples <br /> were all significantly below the corresponding primary maximum contaminant level for <br /> drilling water as presented in Table 2. <br /> • No total petroleum hydrocarbons or benzene were detected above the method detection <br /> limits in any of the grab groundwater samples collected from temporary wells installed in <br /> SB-7 through SB-13. <br /> 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Conclusions and recommendations based on the results and findings of the soil and <br /> groundwater assessment are as follows. <br /> • The extent of petroleum hydrocarbons and BTEX constituents detected in the soil borings <br /> and sidewall samples previously collected in August 2001 appears to be limited to the <br /> immediate vicinity of the former excavation area. <br /> • Grol-In.water does not appear to have been impacted by the petroleum hydrocarbons or <br /> BTEX constituents detected in soil samples. <br /> • Further investigation of petroleum hydrocarbons in the subsurface in the vicinity of or <br /> beyond the replaced natural gas condensate valve does not appear warranted at this time. <br /> f.\02\10-211\211-15\reportdoc <br /> 4 <br />