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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. TPI-Ig, TPI-Id, 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 /> 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 <br /> 1 <br /> 1 <br />' 1:1Tide ter\TW Stockton(Parcel'A-0 l')\Reports\QMRU01013Q10\3010QSSRQRSRQMR Stoticron-FINAL.doc 2.3 <br />