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-72 QCDUP-6 <br /> TPHg (mg/L) 0.18 0.19 +/- 5.4% <br /> TPHd (mg/L 0.66 0.57 +/- 14.6% <br /> TPHo (mg/L 0.44 0.34 +/- 25.6% <br /> Benzene <0.0005 <0.0005 0% <br /> (mg/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-55 and QCDUP-4 were within the acceptable <br /> limit (-200), with the exception of TPHo which was at 25.60. The reported <br /> concentration value for TPHo in well MW-72 was consistent with historical reported <br /> values for the site; thus, the reported data can be considered representative. <br /> 2.6.2.5 General Laboratory Notes <br /> The laboratory validation notes are consistent with the quality assurance and quality <br /> control. Each set of issues corresponds directly with the denoted report. Laboratory <br /> reports are included in Appendix E. <br /> Laboratory Validation, report number 88688: <br /> There was no observed validation issues with D-Zone monitoring wells. <br /> 2.7 THIRD QUARTER 2014 SEPARATE PHASE HYDROCARBONS AND <br /> HYDROCARBON CONCENTRATION TRENDS <br /> 2.7.1 Shallow Zone <br /> The following sections summarize trends for detected petroleum hydrocarbons, fuel <br /> oxygenates, and observed SPH for shallow (A-Zone) groundwater beneath the Site. <br /> 2.7.1.1 Separate Phase Hydrocarbons <br /> Measurable SPH or SPH-sheen has historically been observed in shallow A-Zone wells <br /> MW-10, 2AMW-13, 2AMW-14, MW-19, and DPE-1 through DPE-13. Due to the quantity <br /> and viscous nature of the SPH, and the presence of emulsified SPH and groundwater in <br /> some of these wells, the depth to groundwater/SPH interface and corresponding SPH <br /> thickness have historically been difficult to accurately measure. This is evident by the <br /> inability to obtain SPH thickness measurements from wells 2AMW-14 and DPE-4 in <br /> December 2002, from well DPE-8 in February 2004, and from wells DPE-8 and DPE-10 in <br /> May 2005 (Table 4). Variations in measured depth to water/SPH and SPH thickness are <br /> 5ta ntec 2.13 <br />