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fk <br /> P <br /> 16 GROUND ZERO ANALYSIS, INC. <br /> ' On November 8 , 1995 Ground Zero surveyed the top-of-casing <br /> elevations of previously existing wells MW-1, MW-5, MW-6, and MW-8, <br /> and newly installed monitoring well MW-13 . The survey data was <br /> combined with the depth to groundwater measured in monitoring wells <br /> MW-1 through MW-13 on November 8 , 1995 On November 8 , 1995 <br /> groundwater flow at the site, as measured in the wells, was <br /> generally to the east at a gradient ranging from approximately <br /> 0 004 to 0 005 ft/ft (Figure 3) <br /> Groundwater Analytical Results <br /> ' Elevated levels of TPHg and BTEX were detected in groundwater <br /> samples collected from wells located northeast of the former USTs <br /> The highest concentrations of TPHg and BTEX were detected in <br /> samples collected from wells MW-13 and MW-5, and MW-8, located east <br /> of the former USTs and in the northeast corner of the site, and <br /> ' immediately offsite to the northeast, respectively <br /> Concentrations of gasoline hydrocarbons in groundwater samples <br /> collected from well MW-10 have increased since the previous <br /> sampling event performed in May 1995 <br /> Recommendations <br /> Implement Ground Zero' s corrective action plan to reduce residual <br /> gasoline hydrocarbons in soil beneath the site using vapor <br /> extraction <br /> Continue quarterly monitoring and sampling in order to evaluate the <br /> effectiveness of vapor extraction and anticipated natural <br /> attenuation of gasoline hydrocarbons in groundwater after source <br /> gasoline hydrocarbon concentration reduction <br /> All work performed during this phase of the investigation was <br /> performed in accordance with the previously submitted QA/QC Plan <br /> The next sampling event is scheduled for February, 1995 Your <br /> office will be provided 48-hours notice of any field work <br /> I <br /> i <br /> 1 <br /> 2 <br /> 1 a <br />