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8111eS Environmental Management Inc U-Haul#709-50 <br /> 002-70950-03 Groundwater Monitoring Report <br /> 10/22/01 <br /> dissolved oxygen levels in groundwater ranged from 1 0% in monitor well MW-6B to 2 7% in monitor <br /> well MW-8A (Table 3) <br /> 3 2 GROUNDWATER SAMPLING— SEPTEMBER 2001 <br /> On September 25 and 26, 2001, Blaes Environmental collected 16 groundwater samples from the on-site <br /> monitoring wells that contained water This included samples from the middle"B"casings and lower"C" <br /> i <br /> casings only The drop in groundwater levels did not allow sample collection from any of the upper"A" <br /> casing wells <br /> i <br /> Groundwater sample collection involved purging approximately three well volumes of groundwater from <br /> the wells and allowing the wells to equilibrate before sample collection Bailing was used to purge water <br /> from the middle "B" casings Pumping was used to purge water from the lower "C" casings Purging <br /> wells by bailing involved using a 1 5-inch by 6 5-foot PVC bailer The bailer was decontaminated <br /> between use at each middle "B" well casing The purged water was transferred to an on-site 1,000-gallon <br /> polyethylene storage tank <br /> • Purging by pumping involved the use of a 1 5-mch diameter Grunfos® submersible pump, new hose, <br /> control box, and generator Typically the pump was set near the middle of the screened interval of the <br /> well to minimize the influx of sediment from the bottom of the well The pump was decontaminated <br /> before and after use using a liquid Alconox® detergent wash, a tap water rinse, and a final rinse with <br /> detonized water The average purge rate during purging was approximately three gallons per minute (the <br /> maximum flow rate for the pump) Purge water was temporarily stored in 55-gallon steel drums and Iater <br /> transferred into the on-site polyethylene tank Periodic parameter readings were recorded on the field <br /> data sheets included in Appendix A More details of groundwater purging procedures are presented in <br /> Appendix B <br /> The purged groundwater contained in the on-site 1,000-gallon polyethylene tank is pending waste <br /> profiling and disposal/treatment Disposal/treatment of the contained water will be discussed to a <br /> separate report <br /> 7 <br />