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i <br /> The average groundwater flow direction In June 2000 was toward the northwest with an estimated <br />' hydraulic gradient of 0 0625 feet/foot The average groundwater flow direction in September 2000 was <br /> inconclusive since the groundwater surface was relatively flat <br /> 2.3.2 <br /> I ���J . June 200Q Samnlirag��nt <br /> Groundwater sample analytical results of the June 2000 sampling event revealed vaned results <br /> IAnalytical results of groundwater samples collected from the well casings screened across the <br /> groundwater interface (upper casings "A" and MW-413) indicated the highest concentrations of <br /> hydrocarbons in groundwater from wells MW-3A and MW-4B The June 2000 hydrocarbon <br /> concentration map for wells screened across the groundwater interface indicated a "bulls-eye" pattern <br /> Icentered at the former dispenser islands (Blaes Environmental,2000) <br /> Analytical results of groundwater samples collected from the wells screened at depths of approximately <br /> 52 to 77 feet bgs (middle "B" casings) revealed the highest concentrations of hydrocarbons in <br /> groundwater from wells MW-3B and MW-613 Results of samples from the middle"B" casings indicated <br /> that hydrocarbons were detected in groundwater from wells surrounding the on-site building (MW-IB, <br /> MW-213, MW-3B, MW-6B, and MW-9B) The hydrocarbon concentration map for the "B" casing wells <br /> showed the extent of hydrocarbons In groundwater extending off site to the west and east (Blaes <br /> Environmental, 2000) <br /> Analytical results of groundwater samples collected from the original wells (lower well casings), screened <br /> between approximately 60 and 100 feet bgs, reveal the highest concentrations of hydrocarbons In <br /> groundwater from wells MW-6 and MW-4 The concentrations of hydrocarbons in groundwater from <br /> IMW-6 (41,000 µg/L TPHg and 12,000 µg/L benzene) indicated a shift in the hydrocarbon concentration <br /> pattern from the former dispenser islands to the western portion of the site The apparent shift was <br /> indicated by the low level detections in groundwater from MW-3 compared with analytical results of <br /> water from MW-4 and MW-4B and more elevated hydrocarbon concentrations In water from MW-6 The <br /> separation of the hydrocarbon plume between MW-4 and MW-6 suggested that hydrocarbons In <br /> . 07/10101 <br /> Blaes Project#002-70950-02 5 blm C 1BLAESIU-Hau1170950170950r101 doc <br /> I <br />