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Blaes fill"ownenlal Management Grc U-Haul#709-50 002-70950-04 Groundwater Monitoring Report 03/27/02 . suggest that the boundary of the hydrocarbon plume has not spread to the northern portion of the site The analytical results of the sample from well MW-913 indicated TPHg and benzene concentrations of 110 }tg/L and 2 1 Itg/L TPFIg, respectively These results suggest that the southern extent of the hydrocarbon plume is near well MW-913 The approximate extent of hydrocarbons in groundwater associated with the nztddle "B" casings is shown on Figures 5 and 6 Analytical results of groundwater samples collected from the lower "C" casing wells, screened between approximately 60 and 100 feet bgs, revealed the highest concentrations of hydrocarbons to groundwater from wells MW-4C, MW-7C and MW-6C The detection of hydrocarbons in groundwater from wells MW-4C, MW-7C and MW-6C, and the absence of hydrocarbons in groundwater from wells MW-1C, MW-2C and MW-3C, indicated a shift in the hydrocarbon concentration pattern compared with data from the middle "B" casings Rather than a uniform and consistent hydrocarbon plume, the hydrocarbon plume in the lower "C" casing wells is concentrated near both the western and eastern property boundaries The detection of 850 µg/L TPHg in groundwater from well MW-7C is consistent with previous results and may be associated with a hydrocarbon release from the property immediately to the east of the well • Samples from monitor wells MW-1C, MW-2C, MW-3C, MW-5C and MW-8C did not contain TPHg or benzene above method detection limits The approximate extent of hydrocarbons to groundwater associated with the lower"C"casings is shown on Figures 7 and 8 Laboratory analysis of groundwater samples for fuel additives (MTBE, TBA, DIPS, ETBE, TAME, and naphthalene) indicated non-detectable results In some samples, the method detection levels were raised due to laboratory sample dilution, which may explain the lack of detection of fuel additives in some of the samples The samples collected from wells MW-1C, MW-213 and MW-2C were analyzed for volatile organic compounds using EPA Method 8260B full list Other than BTEX, analytical results of these samples indicated the detection of 1,2-dichloroethane (1,2-DCA), naphthalene, n-propy]benzene, 1,3,5- trimethylbenzene, and 1,2,4-trimethylbenzene Refer to the analytical report included in Appendix D for details • 8