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i 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 with an Alconox <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. The <br /> measurements were made to the top of the well casing on the north side. <br /> j3. Monitoring wells at the site were prepared for sampling by purging the well of <br /> 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 /> V = 3.14x7.481xhri <br /> where: <br /> V one well volume <br /> h = (di-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 of <br /> 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 /> f<': to the laboratory for analyses. <br /> 7. Groundwater samples were delivered to the State-certified hazardous waste <br /> laboratory within approximately 48-hours of collection. <br /> 8. Purged water was contained in a DOT approved 55-gallon drum. The drum <br /> was labeled with the contents, date, well number, client name, and project <br /> number. <br /> 1- <br />