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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 /> 2.4.2 B-Zone Groundwater Quality Data <br /> During 4Q10, groundwater samples were collected from 15 deep zone wells between October <br /> 18 and 21, 2010 (Table 1). Groundwater analytical results are presented in Tables 4 through 7, <br /> and summarized below. TPHg, TPHd, TPHo, benzene, MtBE, and TBA isoconcentration <br /> contour maps are included as Figures 11 through 16, respectively. The certified laboratory <br /> analytical reports for the groundwater sampling event conducted for the L&M OU are included in <br /> Appendix C. <br /> 2.4.2.1 Separate Phase Hydrocarbons <br /> During 4Q10, measurable SPH or SPH-sheen was observed in eight wells. SPH thicknesses <br /> for deep zone wells are summarized below. <br /> Well Identification SPH Thickness <br /> (feet) <br /> MW-17 Sheen <br /> MW-43 0.30 <br /> MW-46 Sheen <br /> MW-47 0.01 <br /> MW-48 0.03 <br /> MW-49 0.52 <br /> MW-50 30.05 <br /> MW-52 0.01 <br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual OSSRQRSRQMR Stockton_FINAL.doc 2.8 <br />