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h ' <br /> • 25 October 2001 <br /> AGE-NC Project No 95-0103 <br /> 1 ,Page 2 of 4 <br /> ' 22 GROUNDWATER SAMPLE COLLECTION AND ANALYSIS <br /> ' Water samples were retrieved from each purged well using new disposable bailers The samples were <br /> 1 transferred into 40-m1 EPA-approved volatile organic analysis(VOA)vials containing 0 5 ml of 18% <br /> hydrochloric acid as a sample preservative The samples were transported in a chilled container <br /> 1 under chain-of-custody to McCampbeil Analytical, Inc (MAI), a California Department of Health <br /> Services (DHS)-certified laboratory, for analysis The ground water samples were analyzed for <br /> 1 Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> ' Method 8015-Modified for gasoline, <br /> • Purgeable aromatic compounds -benzene, toluene, ethyl-benzene and total xylenes (BTEX) <br /> with methyl-tert-butyl ether(MTBE) in accordance with EPA Method 8020, and <br /> • Oxygenating fuel additives -tertiary butyl alcohol (TBA), di-isopropyl ether(DIPS),MTBE, <br /> 1 ethyl tertiary`butyl ether(ETBE) and tertiary amyl methyl ether(TAME)In accordance with <br /> EPA Method 8260-Modified <br /> 1� r- <br /> 3.0. FINDINGS <br /> ' Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to <br /> ground water was assessed from laboratory analysis of the ground water samples <br /> 3 1 GROUND WATER ELEVATION <br /> Depth to ground water ranged from 12 34 to 14 32 feet below the top of the well casings The ground <br /> water elevation ranged from 7 39 to 8 08 feet below sea level Ground water elevation decreased <br /> approximately 2 36 feet between the May and September 2001 monitoring events <br /> The overall ground water flow direction was toward the east-southeast in the area of the former <br /> USTs The average hydraulic gradient was 0 004 ft/ft Figure 3 depicts the ground water elevation <br /> contours at the site However, ground water elevation data from wells MW-1 and MW-7 were not <br /> utilized for ground water elevation contouring due to irregular elevation values,when compared to <br /> 1 near by water elevations <br /> r <br /> r y <br /> r <br /> Advanced GeoEnviroamentai,Inc <br />