Laserfiche WebLink
Metadata
Document management portal powered by Laserfiche WebLink 9 © 1998-2015 Laserfiche. All rights reserved.
1 <br />' 28 June 2002 <br /> • AGE-NC Project No 95-0130 <br />' Page 2 of 6 <br /> Multi-level monitoring wells MW-6 (A, B, C, D and E) and MW-7 (A, B, C, D and E) were purged <br />' by lowering and raising a 3/8-inch outer diameter, length-discrete polyethylene hose equipped with <br /> a ball-valve water tip through the top chambers into the specific water-charged screened section A <br />' Watera-Hydro-Lift II pump equipped with a mechanical arm was utilized to surge the polyethylene <br /> hose Approximately %4 to 3%z gallons of ground water(a minimum of three casing-water volumes <br /> per well)were purged from the multi-level monitoring wells Temperature,pH and conductivity were <br />' measured for stabilization at regular purge-volume Intervals from each well using the Oakton water <br /> analyzer Field data and logs are in Appendix A Multi-level well purged ground water was <br /> transferred to 55-gallon drums and stored on-site in an area lacking general public access <br /> 2 2 GROUND WATER SAMPLING <br /> IGround water samples were collected from purged wells MW-6 (A, B, C, D and E) and MW-7 (A, <br /> B, C, D and E)utilizing t/4-inch diameter polyethylene tubing, ground water samples were collected <br /> from all other purged wells utilizing new, 2-inch diameter disposable polyethylene bailers Ground <br /> water samples were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18% <br /> . hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles were <br /> Inot present in the vials after filling and capping Ground water sample containers were labeled with <br /> the well designation, date, time, and sampler's mitials <br /> I 2 3 LABORATORY ANALYSIS OF GROUND WATER <br /> SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> Ifor <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Methods 5030/8015 <br /> IModified, <br /> • Benzene, toluene, ethylbenzene and xylene(BTEX) and methyl-tertiary butyl ether (MTBE) <br /> by EPA Method 8020, <br /> • Methanol, ethanol, tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether <br /> (ETBE), tert amyl methyl ether(TAME) and MTBE by EPA Method 8260 Modified, and <br /> I - 1,2-Dlchloroethane (1,2-DCA) and ethylene dibromide (EBD) by EPA Method 8260 <br /> Modified <br /> Advanced CeoEnvironmental,Inc <br /> I <br />