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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2010 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> January 31, 2011 <br /> 2.3.2 Shallow Zone Groundwater Quality Data <br /> During 4Q10, groundwater samples were collected from 14 shallow zone wells between <br /> October 18 and 21, 2010 (Table 1). Groundwater analytical results are presented in Tables 4 <br /> through 7, and are summarized below. TPHg, TPHd, TPHo, benzene, MtBE, and TBA <br /> isoconcentration contour maps are attached as Figures 3 through 8, respectively. Certified <br /> laboratory analytical reports for the L&M OU samples are included in Appendix C. In addition, <br /> laboratory validation forms are attached for each individual report submitted by the laboratory, <br /> and the laboratories sub contractors, which addresses issues and/or concerns with the validity <br /> of the analytical data (Appendix C). <br /> 2.3.2.1 Separate Phase Hydrocarbons <br /> During 4Q10, 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. SPH thicknesses were not measured for <br /> shallow zone wells during 4Q10; 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(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual QSSRQRSRQMR Stockton_FINAL.doc 2.3 <br />