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BtA&$nvironmenlal Management Inc U-Haul#709-50 <br /> 002-70950-02 Semi-Annual Report <br /> 12/14/00 <br /> volumes of water had been removed The purged water was transferred from five-gallon buckets to an <br /> on-site 1,000-gallon polyethylene storage tank <br /> Purging by pumping utilized a DurhamGeo® 15-mch diameter submersible pump, associated hose, and <br /> control box The pump was decontaminated before and after use using a liquid Alconox® detergent <br /> wash, a tap water rinse, and a final rinse with deionized water The pump was typically lowered to <br />' approximately five to ten feet from the bottom of the well The average purge rate using the pump was <br /> approximately 2 to 3 gallons per minute Purge water was temporarily stored in 55-gallon steel drums <br />' and later transferred into the on-site polyethylene tank Approximately three well volumes of <br /> groundwater were purged from the wells and periodic parameter readings were recorded on the field data <br /> sheets included in Appendix A More details of groundwater purging procedures are presented in <br /> Appendix B <br /> 1 <br /> The purged groundwater contained in the on-site 1,000-gallon polyethylene tank is pending profiling and <br />' disposal/treatment Disposal/treatment of the contained water will be discussed under separate cover <br /> following the completion of the groundwater monitoring program <br /> .12.1 GroundwaLer Sample Collection —June 2000 <br /> Following purging, groundwater samples were collected from the on-site groundwater wells using a new <br /> polyethylene disposable bailer Prior to sample collection, the depth to groundwater was measured to <br /> confirm that the groundwater level had recovered to within 90% of its original level The water level <br /> measurements, sample name, time, and sample containers were recorded on a sample data sheet included <br /> in Appendix A In addition to the groundwater samples collected from the on-site monitor wells, an <br /> equipment blank sample was collected from the final rinse water used to decontaminate the equipment <br /> Details of the groundwater sampling procedures are included in Appendix B <br /> Groundwater samples collected from the site were contained in appropriate sample containers supplied by <br /> CAS Following collection, the groundwater samples were placed in an iced cooler and transported, <br /> under proper chain-of-custody record, to CAS for analysis <br /> f <br /> fi <br /> I g <br /> C <br />