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Blass Environmental Management Inc 31D Qtr 2003 Groundwater Monrtonng Report 002-70950-04 U-Haul#709-50 Groundwater measurements from U-Haul's "B" casings, in addition to groundwater measurements provided by GZA for the Former Harry's Auto Mart monitoring wells, were used to derive a groundwater gradient map illustrating groundwater conditions at both sites The average groundwater flow direction using the September 8, 2003 data from the U-Haul "B" well casings appears to be predominantly to the southeast across the northern portion of the U-Haul site The average groundwater I flow direction at the Former Harry's Auto Mart site and the southern portion of the U-Haul property appears to radiate southwest to northwest from a high point centered near the southern part of the intersection of Wilson Way and Sangumetti Lane (Figure 3) Groundwater gradient maps were 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 from selected well casings using a YSI-95 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 6 9% in well MW-5B to 22 5% in well MW-5C (Table 2) • 3 2 GROUNDWATER SAMPLING—SEPTEMBER 2003 On September 8, 9, 10, and 11, 2003, Blaes Environmental collected 17 groundwater samples from the on-site and off-site monitoring wells that contained water The current groundwater level 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 I - water 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 Cby pumping The bailers and pump were decontaminated before and after purging each well with a liquid detergent wash (Alconox®) and a tap-water rinse Periodic parameter readings were recorded on the field data sheets included in Appendix A The groundwater purging procedures are presented in 7 I