Laserfiche WebLink
16 <br />' 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 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 Sohnst <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 2-inch or 4-inch diameter <br /> polyvinyl chloride (PVC) baler <br /> 4 One well volume was calculated using the following equation <br /> V = 314x7481 xhr,2 <br />' where <br /> V = one well volume <br /> h = (dl-d2) <br /> r1 = 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 /> 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 /> 1 <br />