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Second Quarter 2006 Groundwater Monitoring and Remediation Status Report <br /> • Cohn Property,3755 Munford Avenue,Stockton California <br /> Page 6 <br /> CONCLUSIONS <br /> Laboratory analytical results indicate the site has been impacted by petroleum hydrocarbons <br /> Concentrations of TPHg and BTEX are elevated in groundwater monitoring wells MW-1 through <br /> MW-4, MW-6, MW-8, MW-11, MW-12 and MW-14 All oxygenates sampled were below <br /> laboratory detection limits, except TBA detected in well MW-6 at 24 ppb <br /> Groundwater elevations increased an average of 2 42 feet this quarter compared with the <br /> previous sampling eventvle <br /> Y <br /> Groundwater iso concentration maps depict the TPHg and benzene plumes l <br /> RECOMMENDATIONS Wk l2 <br /> Apex recommends continued quarterly groundwater monitoring and operation of the soil vapor <br /> extraction system The next sampling event will occur in September 2006 <br /> ADDITIONAL ACTIVITIES PERFORMED AT SITE <br /> Apex personnel supervised the installation of monitoring wells MW-11 through MW-14 in <br /> accordance with Apex's Workplan for Deep Groundwater Monitoring Well Installation, dated <br /> October 4, 2005 and San Joaquin County Environmental Health Department's (SJCEHD) <br /> correspondence dated December 16, 2005 A report detailing subsurface investigation activities <br /> is currently being prepared <br /> Apex personnel supervised the installation of a new domestic well in accordance with ATC's <br /> Workplan and Workplan Addendum and SJCEHD correspondence approving the workplan A 411 <br /> report detailing the domestic well installation activities is currently being prepared � �f <br /> 5 IPJA <br /> 1 � a <br /> A <br /> Al <br /> .� <br /> s <br />