ARCHIVED REPORTS_3RD QUARTER 2010 SITE STATUS REMEDIAL SUMMARY AND GROUNDWATER MONITORING REPORT

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Stantec L & M OPERABLE UNIT- THIRD QUARTER 2010 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT Introduction October 27, 2010 • Copies of validated laboratory analytical reports for soil vapor extraction (SVE) / dual phase extraction (DPE) sampling, soil vapor sampling, and groundwater sampling; • Field data sheets for the third quarter 2010 monitoring and sampling and separate phase hydrocarbon (SPH) removal events; • A summary of soil vapor sampling activities for the third quarter 2010; and, • A summary of remedial activities for the third quarter 2010. 1.1 SITE DESCRIPTION This Third Quarter 2010 Site Status Remedial Summary and Groundwater Monitoring Report describes activities conducted on behalf of CEMC and COP for the Site located adjacent to and along the eastern boundary of the Delta View Apartments (802 West Weber Avenue) and west of the North Lincoln Street and West Weber Avenue cross road in San Joaquin County, California (Figure 1). The Site is currently owned by the City of Stockton Redevelopment Agency (RDA), which refers to the Site as "Parcel 2A". The Site currently consists of relatively flat, fallow land and is mostly undeveloped except for the Delta View Apartments (formerly the Delta Gateway Apartments) located on the western portion of the Site. The Stockton Deep Water Channel, Weber Avenue, and an office building complex are located north of the Site. The Mormon Slough, a children's museum, Work Net building, and State DMV Building (under construction) are located to the southwest, south, and east of the Site, respectively. During a December 2, 2002 meeting with the RWQCB-CVR, environmental management of the Site was divided into three operable units (OUs): L&M OU; Unocal OU (UOU); and Morton OU (MOU). The L&M OU was established to direct investigations in the area south of West Weber Avenue, west of the midline of the former Harrison Street, east of North Edison, and north of former Main Street (Appendix A). This OU includes monitoring wells MW -9, 2AMW-12 through 2AMW-14, MW -16 through MW -35, MW -41 through MW -52, MW -54, MW -55, and dual phase extraction (DPE) wells DPE-1 through DPE-13; the DPE network used to comprise MW -40 which was converted to a DPE well permanently during the second quarter 2007 but was abandoned during the fourth quarter 2008 due to the Unocal excavation activities. The UOU was established to direct investigations from West Weber Street south to the former Main Street and from the midline of the former Harrison Street east to Lincoln Street. The UOU includes monitoring wells MW -3, MW -7, MW -37 and MW -38. The MOU was established to direct investigations from the middle of the former Main Street down to the southern boundary of Parcel 2A and from the midline of the former Harrison Street east to Lincoln Street. The MOU includes monitoring wells MW -06R 2BMW-1, and 2AMW-15 and is currently under redevelopment. Currently, oversight of environmental management responsibilities of the L&M OU is retained by Stantec on behalf of CEMC and COP, and oversight of the UOU and MOU is performed by Wallace Kuhl Associates (Wallace -Kuhl), on behalf of the RDA. I:\Tidewater\TW Stockton (Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 1.2