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3 2 GROUNDWATER SAMPLING <br /> I On June 17 and 26, 1998, groundwater samples were collected from monitoring wells <br /> MW-11 through MW-12, VW-1, and VW-2 Prior to the collection of groundwater samples, <br /> the monitoring wells were purged of a minimum of three well volumes of water and until <br /> 1 pH, conductivity, and temperature stabilized The wells were allowed to recover to at <br /> least 80 percent of their original static groundwater levels prior to sampling <br /> The following procedures were implemented for well monitoring, well purging, and water <br /> 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 delonized water rinse <br /> 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 3 well volumes of water using a submersible pump or 4-inch <br /> diameter 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 2 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 protect number <br /> The groundwater monitoring purge logs are presented in Appendix A <br /> F TransferlRepon%CAF.TRANSYCaltyO9717101 71STOCKTON5gm298fin <br />