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' BLAFJEnvrronmental Management Inc <br /> 002-70950-02 U-Haul#709-50 <br /> Semi-Annual Report <br /> 12/14100 <br /> • Analytical results of groundwater samples collected in February 2000 indicated that the <br /> source area of dissolved-phase hydrocarbons is probably near monitoring well MW-3A <br /> (which is immediately adjacent to the source of hydrocarbons in soil) Groundwater from <br /> MW-3A contained 160,000 micrograms per Iiter (pg/L) TPHg and 15,000 pg/L benzene <br /> Analytical results of groundwater from MW-4B, the nearest sample point to MW-3A, further <br /> defined the center portion of the hydrocarbon plume with TPHg at 34,000 gg/L and benzene <br /> at 3,000 pg/L (Table 2) <br /> • The February 2000 analytical results of groundwater samples collected from monitoring wells <br /> MW-5 and HP-1 were used to define the lateral extent of dissolved-phase hydrocarbons <br /> i Despite detections of toluene (0 5 pg/L) and total xylenes (1 1 µg/L), groundwater from <br /> MW-5A did not contain detectable concentrations of TPHg or benzene (Table 2) This sample <br /> tpoint was used to define the probable northern extent of impacted groundwater A hydro-punch <br /> groundwater sample (HP-1), collected approximately $5 feet south of the source area, did not <br /> contain detectable concentrations of hydrocarbons This sample point defined the probable <br /> southern extent of impacted groundwater(Figure 2) <br /> 0 The February 2000 sampling event results indicated that the main portion of the hydrocarbon <br /> plume appeared to stretch from east to west across the site between monitoring wells <br /> MW-IA, MW-3A, MW-4A, and MW-6A (Blaes Environmental, 2000) <br /> E5 <br /> r <br />