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Stantec <br />L & M OPERABLE UNIT- THIRD QUARTER 2010 SITE STATUS, REMEDIAL SUMMARY, <br />AND GROUNDWATER MONITORING REPORT <br />October 27, 2010 <br />1.0 Introduction <br />On behalf of Chevron Environmental Management Company (CEMC) and ConocoPhillips <br />(COP), Stantec Consulting Corporation (Stantec) has prepared this report in accordance with <br />the Central Valley Regional Water Quality Control Board (RWQCB-CVR) Monitoring and <br />Reporting Program (MRP) No. R5-2004-0820 (Appendix A) for the L&M Operable Unit (OU) <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 (the "Site"; Figure 1). This report presents a discussion of the <br />Site background, groundwater elevations and analytical results, a summary of remedial <br />activities for the third quarter 2010 (3010), and a summary of the trends of petroleum <br />hydrocarbon concentrations in groundwater. Additionally, this report contains a summary of soil <br />vapor well sampling results for the third quarter 2010. <br />In accordance with MRP No. R5-2004-0820, this report includes the following: <br />• A table outlining the requirements of MRP No. R5-2004-0820; <br />• A table showing groundwater well construction details; <br />• Cumulative data tables containing water level measurements and water quality analytical <br />results through the third quarter 2010; <br />• Groundwater elevation contour maps; <br />• Isoconcentration maps for the third quarter 2010, depicting concentrations of total <br />petroleum hydrocarbons in gasoline range organics, total petroleum hydrocarbons in <br />diesel range organics, total petroleum hydrocarbons in motor oil range organics, <br />benzene, methyl tertiary butyl ether, and tertiary butyl alcohol; <br />• A table showing historical lateral and vertical groundwater flow directions and gradients; <br />• A table showing soil vapor sampling locations; <br />• A figure depicting separate phase hydrocarbons and historical depth to water trends; <br />• A figure depicting soil vapor sampling concentrations; <br />• Figures depicting arsenic trends in select wells; <br />I:\Tidewater\TW Stockton (Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 1 . 1 <br />