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i <br /> r 21 April 2000 <br /> ' AGE-NC Project No 95-0144 <br /> Page 2 of 5 <br /> were decontaminated prior to purging each well by pumping an Alconox solution followed by <br /> pumping tap water Monitoring wells MW-19A and MW-20B were purged dry after approximately <br /> 3 5 and 9 gallons of water, respectively, were removed Approximately three well-volumes of water <br /> (approximately eight to sixty gallons) were removed from each of the remaining purged wells <br /> Temperature,pH and conductivity of purged water were measured at regular purge-volume intervals <br /> using an 1CM or Hydac water analyzer The recorded field data and logs are included in Appendix <br /> B All purged water was stored in 55-gaIIon DOT-approved drums on-site <br /> 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> The depth to water was remeasured immediately following purging in each well to determine <br /> recharge A minimum of 80 percent recharge was observed in each well, except MW-I9A and MW- <br /> 20B immediately after purging More than 80 percent recharge was observed in MW-19A and MW- <br /> 20B after approximately,1 5 to 2 hours Water samples were collected from each purged well rising E <br /> new disposable bailers Samples were transferred into 40-m1 EPA-approved VOA vials containing , <br /> 0 5 ml 18% hydrochloric acid as a sample preservative and into I-liter amber bottles without ; <br /> lie preservative The samples were labeled, stored on ice and transported under chain-of-custody to` <br /> McCampbell Analytical, Inc (MAI), a California Department of Health Services (DHS)-certified <br /> analytical laboratory Each sample was analyzed for L <br /> 0 Total petroleum hydrocarbons quantified as gasoline TPH- diesel TPH-d <br /> p y cl g { g), ( ) and motor oil <br /> (TPH-mo) in accordance with EPA Methods 503018015, and <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> and methyl tertiary-butyl Ether(MTBE) in accordance with EPA Method 8020/502 <br /> Samples collected from wells MW-21A and MW-21,13 were also transported to A Keith Kaufman <br /> and analyzed for <br /> • Physicochemical analysis and microbial enumeration <br /> 3 0. FINDINGS <br /> ' Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to <br /> ground water was inferred from laboratory analysis of the ground water samples <br /> F <br /> Advanced GroEm tro;meriul,inc <br /> a <br />