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3 2 GROUNDWATER SAMPLING <br /> ' Groundwater samples were collected from fourteen monitoring and/or vapor extraction <br /> wells Prior to the collection of groundwater samples, the monitoring wells were purged of <br /> a minimum of three well volumes of water and until pH, conductivity, and temperature <br /> stabilized The wells were allowed to recover to at least 80 percent of their original static <br /> groundwater levels prior to sampling <br /> ' The following are procedures for well monitoring, well purging, and water sampling <br /> ' 1 All equipment was washed prior to entering the well with an Alconox solution, <br /> followed by two tap water rinses and a deionized water rinse <br /> 1 2 Prior to purging the wells, depth-to-water was measured using an Solinst <br /> groundwater interface probe to an accuracy of approximately 0 01 foot The <br /> measurements were made to the top of the well casing on the north side <br /> ' 3 Monitoring wells at the site were prepared for sampling by purging the well of <br /> approximately three well volumes of water using a 2-inch or 4-inch diameter <br /> ' polyvinyl chloride (PVC) bailer <br /> 4 Water samples were collected with a single-use Teflon bailer after the well had <br /> been purged and water in the well had equilibrated to approximately 80 percent of <br /> the static water level or two hours after well purging, whichever occurred first The <br /> water collected was immediately decanted into laboratory-supplied vials and <br /> ' bottles The containers were overfilled, capped, labeled, and placed in a chilled <br /> cooler prior to delivery to the laboratory for analysis <br /> ' 5 Chain-of-custody procedures, including chain-of-custody forms, were used to <br /> document water sample handling and transport from collection to delivery to the <br /> laboratory for analyses <br /> 6 Groundwater samples were delivered to the State-certified hazardous waste <br /> laboratory within approximately 48-hours of collection <br /> ' 7 Purged water was contained in a DOT approved 55-gallon drum The drum was <br /> labeled with the contents, date, well number, client name, and project number <br /> ' Theg roundwater monitoring purge logs are presented in Appendix A <br /> ' 2 <br /> F TransterSRapprtSCALTRAN51Cattyo9R71ol71gml98FIN <br />