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Sues Environmental Management Inc U-Hault+709 50 <br />' 002-70950-04 2nd Qts 2003 Groundwater Monitoring RLport <br /> 6,27 03 <br /> . The data from the "B" and "C" well casings were used to create groundwater condition maps showing <br /> the groundwater flow direction across the site Groundwater measurements were provided by GZA for <br /> 1 <br /> the Former Harry's Auto Mart's monitoring wells, and were included with U-Haul's "B" casings to <br /> derive a groundwater gradient map illustrating groundwater conditions at both sites On May 5, 2003 <br /> the average groundwater flow direction using data from the "B" well casings and Harry's Auto's <br /> monitoring wells appears to be predominantly to the north across the site (Figure 3) The groundwater <br /> flow direction in the "C" well casings appears to be east and southeast across the northern portion of the <br /> site, and east across the southern portion of the site (Figure 4) <br /> It is important to note that these groundwater directions differ significantly from previously observed <br /> groundwater flow directions at the site This is most likely a result of the cessation of pumping from <br /> Frontier Motel's domestic well approximately three weeks prior to this groundwater monitoring event <br /> Based on the May 2003 groundwater gradients, the "C" horizon appears to show signs of residual <br /> pumping affects while the "B" horizon does not Groundwater flow directions are expected to have <br /> returned to the previously observed southerly trend since domestic well pumping has resumed following <br /> the installation of the carbon treatment system <br /> In addition to water level depths, Blaes Environmental also measured dissolved oxygen levels from <br /> selected well casings using a YSI-85 dissolved oxygen meter The method for measuring dissolved <br /> oxygen content of groundwater is described in Appendix B The results indicated that dissolved oxygen <br /> levels during this monitoring event ranged from 3 0% in well MW-1113 to 24 4% in well MW-IC <br /> (Table 2) <br /> 3 2 GROUNDWATER SAMPLING—MAY 2003 <br /> On May 5, 6, and 7, 2003, Blaes Environmental collected 26 groundwater samples from the on-site and <br /> off-site monitoring wells that contained water This includes samples from the Frontier Motel Domestic <br /> Well, Harry's Auto's monitoring wells, and U-Haul's "B" and "C" casings only The current <br /> groundwater level did not allow for sampling of any of U-Haul's "A" casing wells <br /> i <br />• <br />