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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 (3Q10), 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 /> ' 0 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 /> ' 0 A figure depicting soil vapor sampling concentrations; <br /> ' 0 Figures depicting arsenic trends in select wells; <br /> ' I.\Tsde teATW Stockton(Parml PA 15)\Reports\QMR\010\3Q10\3QIOQSSRQRSROMR Stoaton_FINAL.doc 1.1 <br />