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' 08 October 2002 <br /> AGE-NC Project 99-0570 <br />' Page 2 of 4 <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> A water sample was collected from each well using the dedicated, disposable plastic bailer <br /> Immediately upon retrieval, samples were transferred into three 40-m1 EPA-approved volatile <br /> I organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and <br /> into a one-liter amber bottle with no sample preservative The samples were logged on a chain-of- <br /> custody form, stored in a chilled container and transported under chain-of-custody to McCampbell <br />' Analytical, Inc (MAI),a California Department of Health(DHS)-certified laboratory, for analysis <br /> Ground water samples were analyzed for the following analytes <br /> I - Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br />' accordance with EPA Method 8015 Modified, <br /> - Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 8020, and <br />' - The oxygenated compounds di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> MTBE,tertiary-amyl methyl ether(TAME),tertiary butanol(TBA),ethyl dibromide(EDB) <br /> I . and ethanoUmethanol, 1,2-dichloroethane(1,2-DCA)in accordance with EPA Method 8260 <br /> Modified <br />' 30. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected <br /> on 27 June 2002, the contaminant impact to ground water was assessed from the laboratory data <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br />' The relative ground water elevation ranged from 7 78 to 10 59 feet below sea level,with an average <br /> depth to water of 14 feet below well casing grade The top of the ground water table occurred within <br /> the screened intervals of the wells Ground water was inferred to be flowing to the north and <br /> northwest (Figure 3) with a significant hydraulic gradient of 0 02 feet/feet toward well MW-5 <br /> I ' <br /> Advanced GeoEnvironmental,Inc <br />