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CONCLUSIONS <br /> There are petroleum hydrocarbons remaining in the soil and groundwater The direction of groundwater <br /> flow and the magnitude of hydraulic gradient are generally consistent with the previous event <br /> Groundwater elevations have increased approximately 1 29 feet since December 2004 <br /> TPHg and/or BTEX constituents were detected at or above laboratory reported detection limits in <br /> groundwater samples collected from MW1, MW2, MW3, MW5, MW6, MW7, VWI, and VW2 <br /> MTBE was present in samples from MW2, MW4, MW5, MW6, MW7, MW9, MW10, and CW TBA <br /> was detected from MW2 and MW7 1,2-DCA was detected in the sample from MW8 None of the <br /> groundwater samples collected contained detectable concentrations of ETBE, TAME, DIPE, or EDB <br /> Dissolved petroleum hydrocarbon concentrations in groundwater from MW1, MW4 through MW10, and <br /> CW generally remain consistent with the results from previous sampling events Dissolved petroleum <br /> hydrocarbon concentrations in groundwater from MW2 and MW3 have increased during the first quarter <br /> 2005 The increase in petroleum hydrocarbon concentrations in MW2 and MW3 is likely a direct result <br /> from the removal of the remediation system <br /> The vapor extraction system was offline for the first quarter 2005 and was removed by the original <br /> vendor without notice during the fourth quarter 2004 ATC is currently ordering another vapor <br /> extraction system for the site <br /> RECOMMENDATIONS <br /> Based on the results of the First Quarter 2005 monitoring event, we recommend the following <br /> • Conduct the Second Quarter 2005 groundwater monitoring and sampling of MW I through <br /> MW10, VW1, VW2, and CW and analyze samples for TPHg and BTEX by EPA methods 8015B <br /> and 8021B, respectively, and MTBE, ETBE, TBA, TAME, and DIPE by EPA method 8260B <br /> + Startup of the replacement Vapor Extraction System <br /> s lenviro1625961quart1yl1gr-2005 doe 7 ATC ASSOCIATES INC <br />