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! '24'July.2001 <br /> AGE-NC Project No. 98--0440 ; <br /> Page 2-6f 4 <br />' 2.2•. COLLECTION OF GROUND WATER SAMPLES <br /> ater .samples were.,collected, frof ,f,each ,purged,well:using;new disposable plastic-bailers. <br /> W ` <br /> Additionally,.water samples were collected from domestic wells DW5055 and DW5157 after the^ <br />' well � ur e valve was opened and water was allowed to'run-for.more than.15 minutes, allowing the,..- <br /> We'll' g .. <br /> r pump to turn on. Each water sample was transferred into one 1-•liter amber bottle without sample <br /> preservative nand into three 40-m1 VOA vials containing 0.5 ml 18%hydrochloric acid as7.a sample <br /> preservative. After collection, the samples were properly labeled, placed in a chilledcontainer.and <br /> transported under chain-of custody to McCampbell Analytical, Inc. (MAI), a California Deparhnent <br /> of Health Services (DHS)-certified analytical,laboratory in Pacheco, California. Each sample_.was ' <br />!' analzed for: <br /> ,.Y a <br />' Totalpetroleum hydrocarbons quantified as gasoline and~diesel (TPH-g and TPH-d, . <br /> respectively) by EPA Methods 8015M/5030/3550 <br />' Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene.(BTEX)'with , <br /> methyl-tertiary butyl ether (MTBE) by EPA Method,8020. <br /> ' The•water sample collected from MW3 was not analyzed for TPH-das the sample container niptured <br />' during transportation to the laboratory. <br />' 3.0. FINDINGS ; <br /> Ground water elevation, flow direction; and gradient were deterrimined,from field"data collected on ' <br />�+ 25 J un'- the contaminant im act to ground water was assessed by the laboratory analytical data.. <br /> e.2001 r amp <br /> 3.1. 'GROUND WATER GRADIENT,AND FLOW DIRECTION <br /> The elevation of ground water in each well was calculated by subtracting tiie depth-to'ground water <br />' evations Table 1 <br /> from the surveyed well casing el ( ). <br /> "Depths to ground water ranged'firorn 12.25;feet to 13.05 feet below tlie:well casing-tops. Ground <br /> water elevations at-the site 'ranged from 27.:25 ,feet above.mean sea level`(MSL) in.,well';MW3 to, <br /> 28.•21'feef above MSL in well MW i.-Ground water.elevations.at the site increased'an average of 096 " ' <br /> feet between the Mauch 2001 and June 2001 sampling events. Ground,water Ievels were within the <br /> screened-intervals of.all the monitoring wells on-'site.' <br /> Advanced GeoEnvironmental,Inc. <br />