ARCHIVED REPORTS XR0000243 - Laserfiche WebLink

Home Browse Search

' 3 2 GROUNDWATER SAMPLING On March 16, 1998, groundwater samples were collected from monitoring wells MW-1 through MW-12, VW-1 , and VW-2 Prior to the collection of groundwater samples, the monitoring wells were purged of a minimum of three well volumes of water and until pH, conductivity, and temperature stabilized The wells were allowed to recover to at least 80 percent of their original static groundwater levels prior to sampling The following are procedures for well monitoring, well purging, and water sampling ' 1 All equipment was washed prior to entenng the well with an Alconox solution, followed by two tap water rinses and a deiornzed water rinse 1 2 Prior to purging the wells, depth-to-water was measured using an Solinst groundwater interface probe to an accuracy of approximately 0 01 foot The ' measurements were made to the top of the well casing on the north side 3 Monitoring wells at the site were prepared for sampling by purging the well of ' approximately 3 well volumes of water using a polyvinyl chloride (PVC) bailer 4 Water samples were collected with a single-use Teflon bailer after the well had Mbeen purged and water in the well had equilibrated to approximately 80 percent of the static water level or 2 hours after well purging, whichever occurred first The water collected was immediately decanted into laboratory-supplied vials and ' bottles The containers were overfilled, capped, labeled, and placed in a chilled cooler prior to delivery to the laboratory for analysis ' 5 Chain-of-custody procedures, including chain-of-custody forms, were used to document water sample handling and transport from collection to delivery to the laboratory for analyses 6 Groundwater samples were delivered to the State-certified hazardous waste laboratory within approximately 48-hours of collection 7 Purged water was contained in a DOT approved 55-gallon drum The drum was ' labeled with the contents, date, well number, client name, and project number The groundwater monitoring purge logs are presented in Appendix A 2 F TraASf8rlproject\CaltyO9T8GOlMSTOCK-rON4gm 198FIN