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r <br /> The sample was analyzed for the compounds listed in Section 2 3 Groundwater analytical data <br /> and summarized in Table 2 <br /> A copy of the analytical report is included in Appendix D <br /> 3.3 Membrane Interface Probe Results <br /> Contamination was indicated in nearly all the MIP borings and was generally present at depths <br />' between 24 and 61 feet bgs The shallowest detector responses were observed beginning at 24 <br /> feet bgs in MIP boring MIP-4, located in an area believed to be between two former USTs and <br /> the former fuel dispensers <br /> r ECD response 1 0E+6 was at approximately 59 feet bgs in boring MIP-4 The <br /> The highest p { ) pp y g g <br /> highest PID and FID responses were found in boring MIP-2 4 0E+7 PID response at 46 feet bgs <br /> and 1 4E+7 at FID response 45 feet bgs All of the response maximums occurred within the <br /> zone where sands were indicated to be present (approximately 40 to 60 feet bgs) <br /> 3.4 Analysis of Non-Contaminant Parameters <br />' <br /> 3.4.1 Carbon Loads <br /> Aerobic bacteria which degrade fuel chemicals also degrade naturally-occurring carbon in the <br /> subsurface Because of this, it is important to know the abundance of non-fuel hydrocarbons <br /> within the site subsurface <br /> ' Ten soil samples were analyzed for total organic carbon (TOC) using the Walkly-Black method <br /> Concentrations in the samples varied from 1 38 to 195 mg/kg in eight of the samples There <br /> were two outlier samples with results of<0 2 and 3 7 mg/kg <br /> 3.4.2 Metals <br /> Shortly after field work was performed it was determined that several samples of soil from the <br /> saturated zone were characterized for metal content during the late 1990s when SVE was being <br /> evaluated Because of this, only one sample was tested for metals That analysis is included in <br /> ran laboratory report from Prima Environmental in Appendix F <br /> ' 3.4.3 Other Electron Acceptors <br /> Groundwater was sampled from wells MW-4RD, MW-4RS, MW-1RD, VW-2 and tested for <br /> noncontammant analytes that were relevant to remedy selection The analytes were oxygen, <br /> nitrate, manganese and sulfate These analytes are terminal electron acceptors in the biochenucal <br /> processes by which bacteria degrade compounds including fuel analytes constituents such as <br /> BTEX Bacteria tend to utilize electron acceptors in order of decreasing redox potential, as <br /> follows DO first, nitrate second, Mn third, and sulfate fourth <br /> SaoOP N 1TechNb1120221 Don RodgersOpIlISIRlSprtng 2006 SIR(August)doc _3 <br /> 82306 <br />