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t07 November 2002 <br /> AGE-NC Project No 98-0497 <br />' Page 2 of 4 <br />' 2 2 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-m1 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 of Health Services-certified analytical laboratory Each <br />' sample was analyzed for <br /> • Total petroleum hydrocarbons as gasoline and diesel(TPH-g and TPH-d)in accordance with <br /> 1EPA Method 8015 Modified, and T� <br /> z,- +lac m <br /> • Benzene,toluene, ethylbenzene and xylenes(BTEX)and methyl tert-butyl ether(MTBE) in <br /> accordance with EPA Method 8021 <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 23 September 2002 was 40 6 feet <br /> below mean sea level (MSL), with the average depth to water at 65 5 feet below casing tops The <br /> average ground water elevation in the wells had decreased 4 0 feet since the last ground water <br /> ' monitoring event Ground water was within the screened interval of each monitoring well <br /> ' The ground water gradient for the September 2002 monitoring event was inferred to be flowing <br /> toward the northeast at an average gradient of 0 004 foot/foot <br /> ' v <br /> 32 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES - <br /> ' The analytical results from the 23 September 2002 ground water sampling event are as follows <br /> Advanced GeoEnvzronmental,Inc <br />