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Fourth Quarter 2005 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 elevat d in groundwater monitoring wells MW,1 through <br /> MW-3, wells MW-6 through MW-8, and DW All seven oxygenates sampled were below <br /> Iaboratory detection limits <br /> Groundwater elevations decreased an average of 0 42 feet this quarter compared with the <br /> previous sampling event <br /> RECOMMENDATIONS <br /> Apex recommends continued quarterly groundwater monitoring and operation of the soil vapor <br /> extraction system The next sampling event will occur in March 2006 <br /> ADDITIONAL ACTIVITIES PERFORMED AT SITE <br /> None <br /> ATTACHMENTS: <br /> Figure 1 Site Vicinity Map <br /> Figure 2 Site Plan Map <br /> Figure 3 Groundwater Contour Map December 7, 2005 <br /> Figure 4 TPHg in Groundwater Isoconcentration Map December 7-8, 2005 <br /> Figure 5 Benzene in Groundwater Isoconcentration Map December 7-8, 2005 <br /> Table 1 Well Construction Details <br /> Table 2 Groundwater Elevation Data <br /> Table 3 Groundwater Analytical Data <br /> Table 4 Historical Groundwater Elevation Data <br /> Table 5 Historical Groundwater Analytical Data <br /> Table 6 Soil Vapor Extraction Rate Calculations <br /> Table 7 Thermal Oxidizer Destruction Efficiency and Emission Rate Calculations <br /> Appendix A Apex Standard Operating Procedures <br /> Appendix B Field Data Sheets <br /> Appendix C Laboratory Analytical Reports and Chain-of-Custody Forms <br /> • <br />