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09 July 2002 <br /> AGE-NC Protect No 98-0497 <br />' Page 2 of 4 <br />' 22 GROUND WATER SAMPLE COLLECTION <br /> Prior to the collection of ground water samples, the depth to ground water was re-measured in each <br /> well to ensure that a minimum of 80% of the initial water volume had recharged Water samples <br /> were then collected from each well using a clean,disposable plastic bailer The water was transferred <br />' Into one 1-liter amber bottle and three chilled 40-mi volatile organic analysis(VOA)vials containing <br /> 0 5 ml hydrochloric acid(18%)as a sample preservative After collection,the samples were labeled <br /> and placed in a chilled container for transportation under chain-of-custody to McCampbell <br /> Analytical Laboratories(MAI),a Department ofHealth Services-certified analytical laboratory Each <br /> sample was analyzed for <br />' 0 Total petroleum hydrocarbons as gasoline and diesel(TPH-g and TPH-d)in accordance with <br /> EPA Method 8015 Modified, <br />' 0 Benzene,toluene, ethylbenzene and xylenes(BTEX)and methyl tert-butyl ether(MTBE) in <br /> accordance with EPA Method 8021, <br />' • a The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether(TAME), tertiary butanol (TBA), 1,2-dibromoethan (EDB) and <br /> 1,2-dlchloroethan (1,2-DCA) in accordance with EPA Method 8260B <br /> 3.0. FINDINGS <br />' Ground water elevation and flow direction were Inferred from field data hydrocarbon-impact to <br />' ground water was assessed by laboratory analysis of the ground water samples <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> Ground water elevations were determined by subtracting the measured depths-to-water from the <br />' surveyed casing elevations The average ground water elevation on 04 June 2002 was 36 63 feet <br /> below mean sea level (MSL), with the average depth to water at 61 5 feet below casing tops The <br /> average ground water elevation In the wells had decreased 0 94 feet since the last ground water <br />' monitoring event Ground water was within the screened Interval of each monitoring well 3 <br /> The ground water gradient for the June 2002 monitoring event was Inferred to be flowing toward the <br />' northeast at a gradient of approximately 0 004 feet/feet <br />' Advanced CeoEn%ironmental,Inc <br />