Laserfiche WebLink
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-64 QCDUP-5 <br /> TPHg (mg/L) 3.1 2.7 +/- 13.8% <br /> TPHd (mg/L 1.4 1.4 Oho <br /> TPHo (mg/L 0.21 0.18 +/- 15.47o <br /> Benzene 0.00056 0.00064 +/- 13.3170 <br /> (mg/L) <br /> MTBE (mg/L 0.013 0.016 +/- 20.77. <br /> TBA (mg/L 0.018 0.02 +/- 10.570 <br /> The calculated RPD between sample MW-64 and QCDUP-5 were within the acceptable <br /> limit (-200), with the exception of MTBE which was at 20.7%. The concentration values <br /> reported for MW-64 during 3Q14 were within historical range; thus, the data can be <br /> considered representative. <br /> 2.5.2.5 General Laboratory Notes <br /> The laboratory validation issues are consistent with the C-Zone quality assurance and <br /> quality control. Each set of issues corresponds directly with the denoted report. <br /> Laboratory reports are included in Appendix E. <br /> Laboratory Validation, report number 88688: <br /> There was no observed validation issues with C-Zone monitoring wells. <br /> 2.6 THIRD QUARTER 2014 D-ZONE GROUNDWATER RESULTS <br /> 2.6.1 D-Zone Groundwater Gradient Data <br /> D-Zone groundwater elevations at the Site ranged from 6.88 ft below MSL (MW-55) to <br /> 6.36 ft below MSL (MW-72; Table 3, Table 4, and Figure 24). Groundwater gradient <br /> during 3Q14 ranged from the north-northwest towards MW-55 and to the south- <br /> southwest from MW-72 with approximate hydraulic gradients of 0.001 ft/ft and 0.002 <br /> ft/ft, respectively (Figure 24). Historic groundwater flow direction and gradient data is <br /> summarized on Table 6. Vertical gradient data is summarized on Table 7. <br /> 2.6.2 D-Zone Groundwater Analytical Data <br /> During 3Q14, groundwater samples were collected from eight D-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 25 through Figure 30, respectively. The certified laboratory analytical reports <br /> including laboratory validation sheets are included in Appendix E. <br /> 5ta ntec 2.11 <br />