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Stantec <br /> L & M OPERABLE UNIT-THIRD QUARTER 2011 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> October 28, 2011 <br /> 2.3.2 Shallow Zone Groundwater Quality Data <br /> During 3Q11, groundwater samples were collected from 14 shallow zone wells between July 18 <br /> and 21, 2011 (Table 1). Groundwater analytical results are presented in Tables 4 through 7, <br /> and are summarized below. TPHg, TPHd, TPHo, benzene, MtBE, and TBA isoconcentration <br /> contour maps are attached as Figures 3 through 8, respectively. Certified laboratory analytical <br /> reports for the L&M OU samples are included in Appendix D. In addition, Lab Validation Forms <br /> are attached for each individual report submitted by the laboratory, and the laboratories sub <br /> contractors, which addresses issues and/or concerns with the validity of the analytical data <br /> (Appendix D). <br /> 2.3.2.1 Separate Phase Hydrocarbons <br /> During 3Q11, sheen was observed in 16 shallow wells; 13 of which were DPE wells. A figure <br /> depicting historical depth to SPH versus time in comparison to depth to groundwater levels <br /> measured in well 2AMW-14 is included as Figure 9; this well is singled out for trending purposes <br /> because it is centrally located on the Site and has contained measurable SPH or observed SPH <br /> sheen since its installation in 2Q02. SPH thicknesses were not measured for shallow zone <br /> wells during 3Q11; sheen is summarized in the tables below. <br /> Well Identification SPH Thickness (feet) <br /> 2AMW-13 Sheen <br /> 2AMW-14 Sheen <br /> MW-19 Sheen <br /> DPE-1 Sheen <br /> DPE-2 Sheen <br /> DPE-3 Sheen <br /> DPE-4 Sheen <br /> DPE-5 Sheen <br /> DPE-6 Sheen <br /> DPE-7 Sheen <br /> DPE-8 Sheen <br /> DPE-9 Sheen <br /> DPE-10 Sheen <br /> DPE-11 Sheen <br /> DPE-12 Sheen <br /> DPE-13 Sheen <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2011\3Q11\3011 QSSR QRSR QMR Stockton_FINAL.doc 2.3 <br />