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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 /> Groundwater Monitoring and Sampling <br /> February 1, 2013 <br /> attached for each individual report submitted by the laboratory, which addresses issues and/or <br /> concerns with the validity of the analytical data (Appendix E). <br /> 2.3.2.1 Separate Phase Hydrocarbons <br /> During 4Q12, sheen was observed in 2 shallow wells. A figure depicting historical depth to SPH <br /> versus time in comparison to depth to groundwater levels measured in well 2AMW-14 is <br /> included as Figure 9; this well is singled out for trending purposes because it is centrally located <br /> on the Site and has contained measurable SPH or observed SPH sheen since its installation in <br /> 2Q02. Well 2AMW-14 was inadvertently missed during 4Q12 monitoring activities. SPH <br /> thicknesses measured for shallow zone wells during 4Q12 are presented below; "Sheen" <br /> indicates a SPH thickness of less than 0.1 inch. <br /> Well Identification SPH Thickness (feet) <br /> 2AMW-13 Sheen <br /> MW-19 Sheen <br /> 2.3.2.2 Petroleum Hydrocarbons and Fuel Oxygenates <br /> TPHg, TPHd, TPHo, and Fuel Oxygenates with concentrations at or above the laboratory <br /> method reporting limits (MRLs) are summarized below. <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2012\4Q12-Ann ual\4Q12 and Annual QSSR QRSR QMR Stockton_FINAL.doc 2.3 <br />