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4f r I <br /> • 31 October 2003 <br /> AGE-NC Project No 95-0173 <br /> Page 2of8 <br /> and logs are included in Appendix A Purged ground water was contamenzed in 55-gallon drums <br /> and was stored on-site in an area lacking general public access <br /> Multi-level monitoring well MW-13(A-C)and air sparge well AW-IB were purged by lowering and <br /> raising a 3/8-inch outer diameter,length-discrete polyethylene hose equipped with a ball-valve water <br /> tip through the top chambers Into the specific water-charged screened section,a Watera-Hydro-Lift II <br /> pump equipped with a mechanical arm was utilized to surge the polyethylene hose Approximately <br /> 3%4 to 4 gallons of ground water(a nummum of three casing-water volumes per well)were purged <br /> from each multi-level well chamber and approximately 14 gallons purged from air sparge well <br /> AW 1-B Temperature,pH and conductivity were measured for stabilization at regular purge-volurrie <br /> Intervals from each well using the Oakton water analyzer Field data and logs are in Appendix A <br /> Purged ground water from the above wells was transferred to 55-gallon drums and stored on-site In <br /> an area lacking general public access <br /> 2 2 GROUND WATER SAMPLING <br /> Following well purging,ground water levels in the wells achieved ammmzum of 80 percent recharge <br /> prior to sample collection, except for well MW-11 which was purged `dry' Subsequently, ground <br /> water samples were collected from each purged well utilizing new, disposable polyethylene bailers <br /> and transferred Into 40-ml EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml <br /> 18% hydrochloric acid as a sample preservative, ground water samples were collected from multi- <br /> level well MW-13 (A,B and C)and air sparge well AW-1 B and poured directly into the 40-ml VOA <br /> vials utilizing the Watera hose bailer Care was taken to ensure that visible air bubbles were not <br /> present In the vials after filling and capping Ground water sample containers were labeled with the <br /> well designation, date, time, and sampler's Initials <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> After labeling,each ground water sample was logged on a chain-of-custody form,placed in a chilled <br /> container and transported to Castle Analytical Laboratory(CAL),a California Department of Health <br /> Services (DHS)-certified laboratory to be analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method <br /> 5030/8015Cm, <br /> • Benzene,toluene,ethylbenzene and xylene(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> by EPA Method 8021B, and <br /> Advanced GeuEnvironmental,Inc <br />