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f ' <br /> , <br /> • <br /> 10 September 1999— <br /> AG <br /> E-NC <br /> 999 .AGE-NC Project No. 98-4440 - <br /> 2 of 421 <br /> - <br /> .2-2. GROUND WATER SAMPLING <br /> Following well purging activities, ground water levels in'all purged monitoring well s.achieved'a•' <br /> minimum of 80. percent recharge. Ground water samples were-collected.from-all. purged wells' <br />' . <br /> uti izing new, disposable polyethylene bailers'and transferred Into one- <br /> ,liter amber-,bottles and-40-m1 <br /> EPA-approved VOA vials-containing-0.5 m1 preservative. Care was taken to'ensure that visible air <br /> bubbles were not present in the vials after filling and capping. Ground:.water sainple containers were , <br /> labeled with the well,designation, date, time, and sampler's initials. Y <br /> LAB.ORATORY`ANA.LYSIS OF.GROUND WATER SAMPLES : y <br />' Each ground water sample was logged.on a'chain-of-custody .form, laced in•a chilled container and <br /> . . Y P <br /> transported to a California Department of Health Services (DHS)=certifedf laboratory'for analysis', <br />' for: <br /> • Total petroleum_• Hydrocarbons quantified as gasoline .and-diesel (TPH:g' and, TPH-d, <br /> respectively) by EPA.Method <br /> Volatile aromatic compounds. benzene, toluene, ethyl benzene and-xylenes (BTEX) with <br /> Methyl-tertiary butyl ether (MTBE).by EPA Method 8020 and . <br /> • Tertiary butanol (TBA)', di isopropyl ether (DIP:E),ethyl tert butyl ether (ETBE), tert amyl <br /> - methyl ether (TAME) arid'MTBE by EPA Method 8260-Modified. <br /> 10. FINDINGS ; s ; <br /> ;b• J: <br /> From the 'field data; AGE was able to-determine the ground water fl- direction adgradierif.• , <br /> Laboratory analysis of four,groundwater'samples'detected.total petroleum hydrocarbons and volatile <br /> aromatics in one water.sample;,no"oxygenated fuel additives were detected in ground water samples.'- <br /> ).L. , <br /> amples. <br /> 3.L RELATIVE,GROUND WATER ELEVATION AND 'GRADIENT <br /> During the June1999'monitoring event,''depths to ground water in' 11s MW=1,'MW-2, MW-3 and' <br /> MW-4-were measured to be'between 11.90 and'12.90`-feet below the,•top of•welLcasings; grourid <br /> water elevations were.calculatedto be between-27.40 and 28.56 feet above mean sea level. Ground <br /> water elevation at the site had.decreased an average.0.32 feet-betweer'-the January 1999 and the June <br /> 1999 ground water monitorin `event Tli <br /> g s . e ground water elevation data,during'the June 1999•ground <br /> Advanced GeuEnvironmen(a).•Inc. ' <br />