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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2012 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> February 1, 2013 <br /> 1.0 Introduction <br /> On behalf of Chevron Environmental Management Company (CEMC) and Phillips 66 (P66), <br /> Stantec Consulting Services Inc. (Stantec) has prepared this report in accordance with the <br /> Central Valley Regional Water Quality Control Board (RWQCB-CVR) Monitoring and Reporting <br /> Program (MRP) No. R5-2012-0805 (Appendix A) for the L&M Operable Unit (OU) located <br /> adjacent to and along the eastern boundary of the Delta View Apartments (802 West Weber <br /> 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 fourth quarter 2012 (4Q12), and a <br /> summary of the trends of petroleum hydrocarbon concentrations in groundwater. Additionally, <br /> this report contains a summary of groundwater gradient, elevation, and analytical trends, soil <br /> vapor well sampling results, and the status of the ongoing active remediation for the year 2012. <br /> In accordance with MRP No. R5-2012-0805, this report includes the following: <br /> • A table outlining the requirements of MRP No. R5-2012-0805; <br /> • A table showing groundwater well construction details; <br /> • Cumulative data tables containing water level measurements and water quality analytical <br /> results through 4Q12; <br /> • Groundwater elevation contour maps; <br /> • Isoconcentration maps for 4Q12, 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 /> I:\Tidewater\TW Stockton(P2A)\QMRs\2012\4Q12-Ann ual\4Q12 and Annual QSSR QRSR QMR Stockton_FINAL.doc 1.1 <br />