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' 17 September 2003 <br /> • AGE-NC Project No 98-0448 <br /> Page 2 of 9 <br />' stabilization at regular purge-volume Intervals from each well using an Oakton water analyzer Field <br /> data and logs are provided in Appendix A Purged ground water was contamenzed in properly <br /> labeled DOT-approved 55-gallon drums and was stored on-site in an area lacking general public <br />' access <br /> Dual-completion monitoring well MW-4A and MW-413 were purged utiltzing a Watera Hydro-Lift <br />' 11 pump equipped with a mechanical arm by lowering and raising a 3/8-inch outer diameter, length- <br /> discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the <br /> specific water-charged screened section Approximately 7 to 15 gallons of ground water(a minimum <br /> of three casing-water volumes per well)were purged from each well location Temperature,pH and <br /> conductivity were measured for stabilization at regular purge-volume Intervals from each well using <br /> an Oakton water analyzer Field data and logs are provided in Appendix A Purged ground water was <br />' containerized in properly labeled DOT-approved 55-gallon drums and was stored on-site in an area <br /> lacking general public access <br /> 2 2 GROUND WATER SAMPLING <br /> • Following well purging,the ground water level in each of the purged wells was allowed to achieve <br /> a minimum of 80%recharge prior to sample collection Ground water samples were collected from <br /> the purged wells utilizing new,disposable polyethylene bailers,ground water samples were collected <br /> from the purged wells MW-4A and MW-4B utilizing %-mch diameter polyethylene tubing and <br /> transferred into 40-m1 EPA-approved volatile organic analysis(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 /> not present in the vials after filling and capping Ground water sample containers were labeled with <br /> the well designation, date, time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to Castle Analytical Laboratory (CAL), a California Department of Health Services <br /> (DHS)-certified laboratory for analysis for <br /> Total petroleum hydrocarbons ,quantified as gasoline (TPH-g) by EPA Method 8015 <br />' Modified, <br /> • Benzene,toluene,ethylbenzene and xylene(BTEX)with methyl tertiary-butyl ether(MTBE) <br /> by EPA Method 8020, <br /> Advanced GeoEnvironmental,Inc <br /> ` 4 <br />