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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2010 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Introduction <br /> January 31, 2011 <br /> • Copies of validated laboratory analytical reports for soil vapor sampling and groundwater <br /> sampling; <br /> • Field data sheets for 4Q10 monitoring and sampling, separate phase hydrocarbon (SPH) <br /> removal event, and monthly site operational maintenance of the active remediation <br /> system; <br /> • A summary of soil vapor sampling activities for 4Q10; <br /> • A summary of remedial activities for 4Q10; and, <br /> • A discussion of annual groundwater monitoring and sampling and soil vapor trends for <br /> 2010. <br /> 1.1 SITE DESCRIPTION <br /> This Fourth Quarter and Annual 2010 Site Status Remedial Summary and Groundwater <br /> Monitoring Report describes activities conducted on behalf of CEMC and COP for the Site <br /> located adjacent to and along the eastern boundary of the Delta View Apartments (802 West <br /> Weber Avenue) and west of the North Lincoln Street and West Weber Avenue cross road in <br /> San Joaquin County, California (Figure 1). The Site is currently owned by the City of Stockton <br /> Redevelopment Agency (SRDA), which refers to the Site as "Parcel 2A". The Site currently <br /> consists of relatively flat, fallow land and is mostly undeveloped except for the Delta View <br /> Apartments (formerly the Delta Gateway Apartments) located on the western portion of the Site. <br /> The Stockton Deep Water Channel, Weber Avenue, and an office building complex are located <br /> north of the Site. The Mormon Slough, Work Net building, State Department of Motor Vehicles <br /> (DMV) Building, and a children's museum are located to the southwest, south, southeast, and <br /> east of the Site, respectively. <br /> During a December 2, 2002 meeting with the RWQCB-CVR, environmental management of the <br /> Site was divided into three operable units (OUs): L&M OU; Unocal OU (UOU); and Morton OU <br /> (MOU). The L&M OU was established to direct investigations in the area south of West Weber <br /> Avenue, west of the midline of the former Harrison Street, east of North Edison, and north of <br /> former Main Street (Appendix A). This OU includes monitoring wells MW-9, 2AMW-12 through <br /> 2AMW-14, MW-16 through MW-35, MW-42 through MW-52, MW-54, MW-55, and dual phase <br /> extraction (DPE) wells DPE-1 through DPE-13; the DPE network used to comprise MW-40 <br /> which was converted to a DPE well permanently during the second quarter 2007 but was <br /> abandoned during the fourth quarter 2008 due to the Unocal excavation activities. The UOU <br /> was established to direct investigations from West Weber Street south to the former Main Street <br /> and from the midline of the former Harrison Street east to Lincoln Street. The UOU includes <br /> monitoring wells MW-3, MW-7, MW-37 and MW-38. The MOU was established to direct <br /> investigations from the middle of the former Main Street down to the southern boundary of <br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual OSSRQRSRQMR Stockton_FINAL.doc 1.2 <br />