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Slags Environmental Management,Inc U-Haul#709-SO ' 002-70950-03 Groundwater Momtonng Report 8113101 ' In addition to depth to water measurements, Blaes Environmental collected dissolved oxygen level measurements from each well casing using a YSI-85 dissolved oxygen meter The method of dissolved ' oxygen measurement collection is described in Appendix B Measurements indicated that dissolved oxygen levels in groundwater ranged from 0 1% in monitor well MW-413 to 25 3% in monitor well ' MW-3 Dissolved oxygen levels above 10%were observed in monitor wells MW-3 and MW-5 (Table 3) ' 3 2 GROUNDWATER SAMPLING—JULY 2001 On July 10 and 12, 2001, Blaes Environmental collected 16 groundwater samples from the on-site ' monitoring wells This included samples from the middle `B" casings and lower"C" casings The drop in groundwater levels did not allow sample collection from any of the upper"A"casing wells Groundwater sample collection involved purging approximately three well volumes of groundwater from the wells and allowing the wells to equilibrate before sample collection Bailing was used to purge water from the middle `B" casings Pumping was used to purge water from the lower "C" casings Purging ' wells by bailing involved using a 1 5-inch by 6 5-foot PVC bailer that was decontaminated between use at each middle `B" well casing The purged water was transferred from five-gallon buckets to an on-site ' 1,000-gallon polyethylene storage tank ' Purging by pumping involved the use of a 1 5-inch diameter Grunfos® submersible pump, new hose, control box, and generator Typically the pump was set near the middle of the screened interval of the ' welI to minimize the influx of sediment from the bottom of the well The pump was decontaminated before and after use using a liquid Alconox® detergent wash, a tap water rinse, and a final rinse with ' deionized water The average purge rate during purging was approximately three gallons per minute (the maximum flow rate for the pump) Purge water was temporarily stored in 55 gallon steel drums and later transferred into the on-site polyethylene tank Periodic parameter readings were recorded on the field ' data sheets included in Appendix A More details of groundwater purging procedures are presented in Appendix B The purged groundwater contained in the on-site 1,000-gallon polyethylene tank is pending waste profiling and disposal/treatment Disposal/treatment of the contained water will be discussed in a separate report ' 8