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Blaos Environmental Management,Inc <br /> ' 002-70950-03 U-Haul#709-50 <br /> Groundwater Momtonng Report <br /> 8/13/01 <br /> versus "C" casing results) A summary of analytical results for the December 2000 sampling event is <br /> presented in Table 2 <br /> 1 <br /> Analytical results of groundwater samples collected from the well casings screened across the <br /> groundwater interface (middle `B"casings)revealed that the hydrocarbon plume encompasses the central <br /> portion of the site and appears to be centered near well MW-3A/B The boundary of the hydrocarbon <br /> plume at the groundwater interface was near the northern and southern property boundaries and extended <br /> off-site east and west of the site <br /> ' <br /> Analytical results of groundwater samples collected from the lower "C" casing wells revealed that the <br /> ' hydrocarbon plume appeared to be split between the east(MW-4)and west(MW-6) The northern half of <br /> the site did not contain total petroleum hydrocarbons as gasoline (TPHg) or benzene above method <br /> detection limits (Blaes Environmental,200 1) <br /> 2 4 2 2 March 2001 mphng Event <br /> Laboratory analytical results from the March 2001 groundwater sampling event indicated results similar <br /> ' to the those of the December 2000 sampling event A summary of analytical results for the March 2001 <br /> sampling event is presented in Table 2 <br /> ' Review of the analytical results of the middle "B" casing groundwater sample group, indicated that the <br /> extent of hydrocarbons in groundwater had little variation from the results of the previous sampling event <br /> ' in December 2000 As results of the December 2000 sampling event indicated, the extent of <br /> hydrocarbons at the groundwater interface was centered at the former dispenser island and included the <br /> ' central portion of the site around the building The eastern and western extent of the hydrocarbon plume <br /> extended beyond the property boundaries (Blaes Environmental, 2001) <br /> 1 <br /> Analysis of groundwater samples from the lower"C" casing wells indicated that detectable hydrocarbons <br /> were relatively widespread but concentrated along the western property boundary (MW-6) In addition, <br /> samples from wells along the eastern property boundary (MW-5, MWA, MW-4, and MW-7) contained <br /> ' detections of hydrocarbons Again, non-detect to low level hydrocarbon concentrations in wells across <br /> the center of the site (MW-2 and MW-3) suggest a polarization between hydrocarbon concentrations in <br /> 5 <br />