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Bias$Environmental Management Inc U-Haul#709-50 002-70950-04 Groundwater Momtonng Report 5/30/03 The data from the `B" and "C" well casings were used to create groundwater condition maps showing • the groundwater flow direction across the site On March 24, 2003, the average groundwater flow direction using data from the "B" well casings appears to be predominantly to the south across the site (Figure 3) The groundwater flow direction in the "C" well casings appears to be northwest across the northern I portion of the site, and south across the southern portion of the site (Figure 4) Note that the groundwater flow directions indicated in Figures 3 and 4 are estimates,as the gradient is nearly flat In addition to water level depths, Blaes Environmental also measured dissolved oxygen levels from selected well casings using a YSI-85 dissolved oxygen meter The method for measuring dissolved oxygen content of groundwater is described in Appendix B The results indicated that dissolved oxygen i levels during this monitoring event ranged from 16% in well MW-11B to 10 2% in well MW-1C (Table 2) I3 2 GROUNDWATER SAMPLING—MARCH 2003 I On March 24, 25, 26, and 27, 2003,Blaes Environmental collected 20 groundwater samples from the on- site and off-site monitoring wells that contained water This includes samples from the "B" and "C" casings only The current groundwater level did not allow for sampling of any of the"A"casing wells i Groundwater sample collection involved purging approximately three well volumes of groundwater from each well and allowing the wells to recharge before sample collection Purging was performed during this event either by hand bailing or pumping water from the well casings, dependent on the volume of iwater in the well The bailer used for purging during this sampling event was a 1&718-inch diameter by 3-foot long bailer Blaes Environmental utilized a 2"Grundfos"Reda-flo" submersible pump for purging Iby pumping The bailers and pump were decontaminated before and after purging each well with a liquid detergent wash (Alconox®) and a tap-water nnse Periodic parameter readings were recorded on the field data sheets included in Appendix A The groundwater purging procedures are presented in Appendix B Purge water was stored in a 1,000-gallon polyethylene tank located on the property, Ipending proper recycling and disposal I