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U-ffaul#709-50 Blaes Environmental <br />' Additional Site Characterization <br />' did not contain detectable concentrations of hydrocarbons This sample point defined the probable <br /> . southern extent of impacted groundwater(Figure 10) <br /> The analytical results of the hydro-punch sample (HP-1) were also used for placement of the new <br /> monitoring well MW-9ab Despite the non-detectable results of sample HP-1, groundwater from <br /> MW-9a contained detectable concentrations of hydrocarbons (Figure 10) <br /> The western extent of dissolved-phase hydrocarbons remained undefined due to hydrocarbon detections <br /> in groundwater from monitoring wells MW-6a and MW-8a (Figure 9) However, the sample from <br /> MW-2a contained lower hydrocarbon concentrations than those in the sample from MW-8a (Table 6) <br /> This may suggest that the northwestern portion of the hydrocarbon plume is separate from the source <br /> area The property immediately west of the site is owned by the Stockton Unified School District This <br /> property is occupied by office trailers and stockpiled classroom furniture and equipment <br /> I The main portion of the hydrocarbon plume appears to stretch east to west across the site between <br /> monitoring wells MW-la, MW-3a, MW-4a, and MW-6a The eastern and western portions of the <br /> plume extends off site and remains undefined (Figure 10) The property southeast of the site is <br /> occupied by a former gasoline station that is no longer in use (Figure 2) It is possible that a separate <br /> plume associated with this property may commingle with the U-Haul Facility #709-50 hydrocarbon <br /> I plume <br /> I <br /> 53 RECOMMENDATIONS <br /> Blaes Environmental does not recommend further site characterization activities at the U-Haul Facility <br /> #709-50 Based on the finding of this investigation, characterization of the site is adequate to proceed with <br /> preparation of a remedial action plan and implementation of a remedial design <br /> It is possible that future groundwater sample analysis may included fuel "finger-printing" This analysis <br /> may determine a difference between the detection of hydrocarbons in groundwater from MW-6a and MW- <br /> 8a versus the hydrocarbons in groundwater from MW-3a and MW-4a <br /> 24 <br />