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L & M OPERABLE UNIT-THIRD QUARTER 2014 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> October 31, 2014 <br /> Analyte Sample # Sample # �o Difference <br /> MW-58 QCDUP-4 <br /> TPH (mg/L <0.05 <0.05 Oho <br /> TPHd (mg/L <0.05 0.069 +/- 31.917o <br /> TPHo (mg/L <0.05 <0.05 0% <br /> Benzene <0.0005 <0.0005 Oho <br /> m /L <br /> MTBE (mg/L <0.0005 <0.0005 Oho <br /> TBA (mg/L <0.005 <0.005 Oho <br /> The calculated RPD between sample MW-24 and QCDUP-2 were within the acceptable <br /> limit (200). The calculated RPD between sample MW-58 and QCDUP-4 were within the <br /> acceptable limit, with the exception of TPHd which was at 31 .9%. The TPHd <br /> concentration is consistent with historical concentrations for the Site; thus, the reported <br /> values of TPHd can be considered representative. <br /> 2.4.2.5 General Laboratory Notes <br /> The laboratory validation notes are consistent with the B-Zone quality assurance and <br /> quality control. Each set of issues corresponds directly with the denoted report. All <br /> laboratory reports are included in Appendix E. <br /> Laboratory Validation, report number 88688: <br /> There was no observed validation issues with B-Zone monitoring wells. <br /> 2.5 THIRD QUARTER 2014 C-ZONE GROUNDWATER RESULTS <br /> 2.5.1 C-Zone Groundwater Gradient Data <br /> C-Zone groundwater elevations at the Site ranged from 6.86 ft below MSL (MW-54) to <br /> 6.31 below MSL (MW-66; Table 3, Table 4, and Figure 17). Groundwater gradient during <br /> 3Q14 in the C-Zone appears radially inward towards well MW-54 at 0.001 ft/ft (Figure <br /> 17). Historic groundwater flow direction and gradient data is summarized on Table 6. <br /> Vertical gradient data is summarized on Table 7. <br /> 2.5.2 C-Zone Groundwater Analytical Data <br /> During 3Q14, groundwater samples were collected from eight C-Zone wells. <br /> Groundwater analytical results are summarized below and included on Table 3. TPHg, <br /> TPHd, TPHo, benzene, MTBE, and TBA isoconcentration contour maps are included as <br /> Figure 18 through Figure 23, respectively. The certified laboratory analytical reports <br /> including laboratory validation sheets are included in Appendix E. <br /> 5ta ntec 2.9 <br />