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8161es Environmental Management Inc 2nd Qtr 2004 Groundwater Monitoring Report 002-70950-04 [J-Haul#709-50 Groundwater measurements from U-Haul's "B" well casings, in addition to groundwater measurements • provided by GZA for the Former Harry's Auto Mart monztonng wells, were used to derive a groundwater gradient map illustrating groundwater conditions at both sites The average groundwater flow direction across the U-Haul site using the May 24, 2004 data from the U-Haul "B" well casings appears to be toward the northwest at an average gradient of 0 001 feet per foot (Figure 3) A groundwater gradient map was not generated for the "C" horizon since all screened intervals in the "C" wells were submerged In addition to water level depths, Blaes Environmental also measured dissolved oxygen levels, electncal conductivity, salinity, and temperature 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 levels during this monitoring event ranged from 0 9% in well MW-4B to 22 5% to well MW-3C (Table 2) 3 2 GROUNDWATER SAMPLING--MAY 2004 On May 25, 26, and 27, 2004, Blaes Environmental collected 22 groundwater samples from the on-site and off-site monitoring wells that contained water The groundwater levels at the time were below the well screen and did not allow for sampling of any of U-Haul's "A" casing wells 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 water in the well The bailer used for purging during this sampling event was a 1&1/2-inch diameter by 6-foot long bailer Blaes Environmental utilized a 2" Grundfos "Reds-flo" submersible pump for purging by pumping The bailers and pump were decontaminated before and after purging each well with a liquid detergent wash (Liquinox®) and a tap-water rinse Periodic parameter readings were recorded on the field data sheets included to 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, pending proper recycling and disposal 7 I