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BIaeS Envtronnzental Manageuierrt Inc U-Haul#i709 50 002-70950 03 Work Plan 11/8/01 screened interval that spans across the upper "A" and middle "B"casing intervals As a result, these wells will be referred to as "A"casing wells Groundwater sample collection will involve purging at least three well volumes of groundwater from the wells and allowing the wells to equilibrate before sample collection Bailing will be used to purge water from the "A" and "B" well casings Pumping will be used to purge water from the lower "C" casings Purging wells by bailing will involve using a 1 5-inch by 6 5-foot PVC bailer The bailer will be decontaminated between use using a liquid Alconox® detergent wash, a tap water rinse, and a final rinse with deionlzed water Purged water from bailing will be transferred from five-gallon buckets to an on- site 1,000-gallon polyethylene storage tank Purging by pumping will involve the use of a 1 5-inch diameter Grunfos® submersible pump, new hose, control box, and generator The pump will typically be set near the middle of the screened interval of the well to minimize the influx of sediment from the bottom of the well The pump will be decontaminated between uses as described above The average purge rate during purging will be approximately three gallons per minute (the maximum flow rate for the pump) Purge water will be temporarily stored in 55-gallon steel drums and later transferred into the on-site polyethylene tank During purging, periodic parameter readings will be recorded on the field data sheet (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 will be profiled and properly disposed/treated Disposal/treatment of the contained water will be discussed in the quarterly reports 3 2 3 Groundwater Sample Collection Following purging, groundwater samples will be collected from the monitor wells using a new disposable polyethylene bailer Prior to sample collection, the depth to groundwater will be measured to confirm that groundwater recovered to within 90% of the original level The water level measurements, sample name, time, and sample containers will be recorded on a sample data sheet (Appendix A) In addition to the groundwater samples collected from the monitor wells, a duplicate sample will be collected from a selected monitor well Collected groundwater samples will be contained in appropriate sample bottles supplied by the analytical laboratory Following collection, the groundwater samples will be placed in an 12