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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 /> 2.4.2 B-Zone Groundwater Quality Data <br /> During 3Q11, groundwater samples were collected from 15 deep zone wells between July 18 <br /> and 21, 2011 (Table 1). Groundwater analytical results are presented in Tables 4 through 7, <br /> and summarized below. TPHg, TPI-Id, TPI-lo, 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 D. <br /> 2.4.2.1 Separate Phase Hydrocarbons <br /> During 3Q11, 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 0.23 <br /> MW-46 Sheen <br /> MW-47 Sheen <br /> MW-48 0.02 <br /> MW-49 0.08 <br /> MW-50 27.55 <br /> MW-52 Sheen <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2011\3Q11\3011 QSSR QRSR QMR Stockton_FINAL.doc 2.8 <br />