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Blaes knvironmental Management Inc U Haul#709 50 002 70950 03 Groundwater Monitoring Report 1/25/02 Analytical results of groundwater samples collected from the well casings screened across the groundwater interface (middle "B" casings) revealed the highest concentrations of hydrocarbons in groundwater from wells MW-213, MW-313, MW-413, and MW-613 The concentrations of hydrocarbons in groundwater from well MW-2B (37,000 µg/L TPHg and 71 gg/L benzene) and well MW-313 (190,000 µg/L TPHg and 40,000 µg/L benzene) suggest that the source area of hydrocarbons was near wells MW-313 and MW-2B The elevated concentrations of hydrocarbons in water from wells MW-413 and MW-613 suggest that the hydrocarbon plume has spread across the site between the eastern and western property boundaries The non-detect levels of benzene in groundwater from monitor wells MW-513, MW-8A and MW-913 suggest that the boundary of the hydrocarbon plume has not spread to the northern and south portions of the site The analytical results of the sample from well MW-9B indicated a non- detect level of benzene and the detection of 140 pg/L TPHg This result suggests that the southern extent of the hydrocarbon plume is near well MW-913 The approximate extent of hydrocarbons in groundwater associated with the middle "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 in groundwater from wells MW-6C and MW-4C The detection of hydrocarbons in groundwater from wells MW-6C and MW-4C, and the absence of hydrocarbon 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 the western and eastern property boundaries 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 in groundwater associated with the lower "C" casings is shown on Figures 7 and 8 Laboratory analysis of groundwater samples for fuel additives (MTBE, TBA, DIPE, 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 The samples collected from wells MW-213 and MW-2C were analyzed for volatile organic compounds using EPA Method 8260B full list Other than BTEX and fuel additives, analytical results of these