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L & M OPERABLE UNIT- FIRST QUARTER 2012 SITE STATUS, REMEDIAL SUMMARY, <br />AND GROUNDWATER MONITORING REPORT <br />April 30, 2012 <br />I:\Tidewater\TW Stockton (P2A)\QMRs\2012\1Q12\1Q12 QSSR QRSR QMR Stockton_FINAL.doc 1.1 <br />1.0 Introduction <br />On behalf of Chevron Environmental Management Company (CEMC) and ConocoPhillips <br />(COP), Stantec Consulting Services Inc. (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 and soil vapor well sampling results for the first quarter 2012 (1Q12), and a summary <br />of the trends of petroleum hydrocarbon concentrations in groundwater. <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 1Q12; <br />Groundwater elevation contour maps; <br />Isoconcentration maps for 1Q12, depicting concentrations of total petroleum <br />hydrocarbons in gasoline range organics, total petroleum hydrocarbons in diesel range <br />organics, total petroleum hydrocarbons in motor oil range organics, benzene, methyl <br />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 />Copies of validated laboratory analytical reports for soil vapor sampling and groundwater <br />sampling;