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1 Blaes Enrrranrrrental Management lrrc <br /> 002-70950-04 U-Haulit709-50 <br /> Groundwater Monitoring Report <br /> 1/23/03 <br /> The groundwater flow direction in the "C" well casings a appears pp ars to be northwest across the northern <br /> ' portion of the site and south across the southern portion of the site (Figure 4) Note that the groundwater <br /> flow directions indicated in Figures 3 and 4 are estimates, as the gradient is nearly flat <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 /> 1 levels during this monitoring event ranged from 0 5% in wells MW-1B and MW-6B to 13 3% in well <br /> MW-2C (Table 2) <br /> 1 3 2 GROUNDWATER SAMPLING—DECEMBER 2002 <br /> 1 On December 3, 4, and 5, 2002, Blaes Environmental collected 18 groundwater samples from the on-site <br /> and off-site monitoring wells that contained water This includes samples from the "B" and "C" casings <br /> 1 only The current groundwater level did not allow for sampling of any of the "A"casing wells <br /> ' Groundwater sample collection involved purging approximately three well volumes of groundwater from <br /> each well and allowing the wells to recharge before sample collection Purging was performed during <br /> 1 this event either by hand bailing or pumping water from the well casings, dependent on the volume of <br /> water in the well The bailers used for purging during this sampling event were either a 1&7/8-inch <br /> ' diameter by 3-foot long bailer, or a 3-inch diameter by 8-foot long bailer Blaes Environmental utilized a <br /> 2" Grundfos "Reda-flo" submersible pump for purging by pumping The bailers and pump were <br /> decontaminated before and after purging each well with a liquid detergent wash (Alconox®), a tap water <br /> 1 rinse, and a final rinse with de-ionized water Periodic parameter readings were recorded on the field <br /> data sheets included in Appendix A The groundwater purging procedures are presented in Appendix B <br /> 1 Purge water was stored in a 1,000-gallon polyethylene tank located on the property, pending proper <br /> recycling and disposal <br /> 1 <br /> 3 2 1 Groundwater Sam le Collection—December 2002 <br /> 1 Following purging, groundwater samples were collected from both on-site and off-site groundwater wells <br /> using a new polyethylene disposable bailer for each well <br /> 1 <br /> i6 <br /> 1 <br /> 1 <br />