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Stantec <br />L & M OPERABLE UNIT- THIRD QUARTER 2010 SITE STATUS, REMEDIAL SUMMARY, <br />AND GROUNDWATER MONITORING REPORT <br />Groundwater Monitoring and Sampling <br />October 27, 2010 <br />2.3.2 Shallow Zone Groundwater Quality Data <br />During the third quarter 2010, groundwater samples were collected from 14 shallow zone wells <br />between July 19 and 22, 2010 (Table 1). Groundwater analytical results are presented in <br />Tables 4 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 />2.3.3 Separate Phase Hydrocarbons <br />During the third quarter 2010, measurable SPH or SPH -sheen was observed in 16 shallow <br />wells; 13 of which were DPE wells. A figure depicting historical depth to SPH versus time in <br />comparison to depth to groundwater levels measured in well 2AMW-14 is included as Figure 9. <br />SPH thicknesses for shallow zone wells are summarized below. <br />Well Identification <br />SPH Thickness (feet) <br />2AMW-13 <br />Sheen <br />2AMW-14 <br />Sheen <br />MW -19 <br />Sheen <br />DPE-1 <br />Sheen <br />DPE-2 <br />Sheen <br />DPE-3 <br />Sheen <br />DPE-4 <br />Sheen <br />DPE-5 <br />Sheen <br />DPE-6 <br />Sheen <br />DPE-7 <br />Sheen <br />DPE-8 <br />Sheen <br />DPE-9 <br />Sheen <br />DPE-10 <br />Sheen <br />DPE-11 <br />Sheen <br />DPE-12 <br />Sheen <br />DPE-13 <br />Sheen <br />IA-Fidewater7W Stockton (Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 2.3 <br />