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Blaes Environmental Management Inc U-Haul#703-50 ' 002-70950 03 Groundwater Monitoring Report 8/13/01 ' groundwater from wells MW-313, MW-213, MW-413, and MW-613 The concentrations of hydrocarbons in groundwater from MW-313 (150,000 micrograms per liter [gg/L] TPHg and 52,000 pg/L benzene) and ' MW-213 (58,000 gg/L TPHg and 13,000 µg/L benzene) suggested that the source area of hydrocarbons was near MW-313 and MW-2B The elevated concentrations of hydrocarbons in water from 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-113, ' MW-5B, MW-8A, and MW-913 suggested that the boundary of the hydrocarbon plume was near the northern and southern property boundanes The approximate extent of hydrocarbons in groundwater ' associated with the middle`B"casings is shown on Figure 5 tAnalytical 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-6 and MW4 The concentrations of hydrocarbons in groundwater from MW-6 (10,000 gg/L TPHg and 3,000 gg/L benzene) indicated a shift in the hydrocarbon concentration pattem compared ' with data from the middle "B" casings Rather than the hydrocarbon plume circling the building with a "bulls-eye"pattern, the plume was confined to the southern portion of the site along the eastern (MW-4) and western (MW-6) property boundaries (Figure 6) Samples from monitor wells MW-1, MW-2, MW- 3,MW-5, and MW-8 did not contain TPHg or benzene above method detection limits Laboratory analysis of groundwater samples for MTBE, TBA, DIPE, ETBE, TAME, and naphthalene indicated the detection of naphthalene in the samples from wells MW-4 and MW-413 at concentrations of ' 160 µg/L and 560 gg/L, respectively Due to laboratory sample dilution, some of the method detection levels were raised for several of the groundwater samples, which may, in part, explain the lack of ' detection in those samples ' Analysis of several groundwater samples by EPA method 8260 full list indicated the detection of volatile organic compounds other than BTEX in samples from wells MW-2, MW-213, MW-4 and MW-413 Results indicated the detection of 1,2-Dichloroethane (1,2-DCA) in samples from wells MW-2, MW-2B, MW4, and MW-413 Detectable concentrations of 1,2,4-Trimethylbenzene and 1,3,5-Trimethylbenzene were reported in samples from wells MW-2B, MW-4, and MW-413 Other detected volatile organic compounds included Isopropylbenzene and n-Propylbenzene in groundwater from wells MW-4 and ' MW-4B M 10 r