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APPENDIX A <br /> ' GROUNDWATER MONITORING FIELD PROCEDURES <br /> The following are procedures for well monitoring, well purging, and water sampling <br /> ' 1 All equipment was washed prior to entering the well <br /> with an Afconox <br />' solution, followed by two tap water rinses and a deionized 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 <br /> The measurements were made to the top of the well casing on the north <br /> side <br /> ' 3 Monitoring wells at the site were prepared for sampling by purging the well <br /> of approximately 3 well volumes of water using a 2-inch or 4-inch diameter <br /> polyvinyl chloride (PVC) bailer <br /> 4 One well volume was calculated using the following equation <br /> tV = 314x7481 xhr,2 <br /> where <br /> V = one well volume <br /> h = (d,-d2) <br /> r, =the radius of the well in feet <br />' 5 Water samples were collected with a Teflon bailer after the well had been <br /> purged and water in the well had equilibrated to approximately 80 percent <br /> of the static water level or for 2 hours, whichever occurred first The water <br /> collected was immediately decanted into laboratory-supplied vials and <br /> bottles The containers were overfilled, capped, labeled, and placed in a <br />' chilled cooler prior to delivery to the laboratory for analysis <br />' 6 Chain-of-custody procedures, including chain-of-custody forms, were used <br /> to document water sample handling and transport from collection to delivery <br /> to the laboratory for analyses <br /> 7 Groundwater samples were delivered to the State-certified hazardous <br /> waste laboratory within approximately 48-hours of collection <br />