ARCHIVED REPORTS_XR0012651 - Laserfiche WebLink

Home Browse Search

F €Y capped with plastic end caps, which in turn were sealed to the tube by wrapping with electrical tape. The tubes were then labeled, inserted into ziplock baggies and placed on ice in an t ; insulated cooler. At the end of the day, the two samples closest to groundwater were delivered to the laboratory. ;...a All soil samples submitted for chemical analysis were labeled in the field with an indelible ink pen as they were collected. For each sample, the date and time of sample collection, the sam- pler's initials, the project name and the designated analyses were recorded on the label and in the field log book. Soil samples were identified by a well number-depth combination. As two tubes were normally collected at each sampling location (to provide the laboratory with extra sample volume) the tubes were distinguished by lettering them "A" and "B", with the "A" sample being the deeper of the two. For example, a soil sample numbered M-71-35A would indicate a soil sample collected at monitor well : MW-1 from 35 feet BGS and located in the lower position of the two tubes retained for submission to the laboratory. The soil samples submitted for chemical analysis were transported under chain-of-custody to the WESTON Analytics' Stockton, CA. laboratory. The analytical suite included aromatic volatile organics by EPA Method 8020 and total petroleum hydrocarbons by t= Method 8015 modified for diesel. All chain-of-custodies are presented in Appendix F Chain-of-Custodies. Well Development On June 17, 1988, the monitor wells were developed by a combina- tion of swabbing and bailing using a CME-45 drill rig; on June 20, 1988, development was continued using a 3.5 inch submersible stainless steel pump. Each well was first swabbed repeatedly, then bailed. Approximately 15 gallons of water were each bailed from M19-1 and MW-2, while approximately 20 gallons of water was bailed €rom .MW-3. The water was collected in a 55 gallon drum. This removed the heavier materials from the inside of the wells. Pumping of the wells resulted in a significant clarifying of the water. MW-1 was pumped at the pump's maximum flow rate of approximately 10.5 gallons per minute (GPM) for 30 minutes, removing about 315 gallons of water. MW-2 was pumped at about -- 5.5 GPM (the maximum the well could sustain) for 45 minutes, yielding about 225 gallons of water. MW-3 was pumped at about 10.5 GPM for 26 minutes, producing about 273 gallons of water. For each well, the effluent was very clear at the end of the development process. All pump effluent was directed into a large -----__-----_---- -----__-------------holding.._tank----which---.had---been--del-ivered--to-the-- site--on---June- 1G, - - - --------- ---- — R 1988. The swab and bailer were steam cleaned prior to first use C - 3