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24 April 2003 <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 mitral 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 i-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),aDepartment ofHealth 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 /> EPA Method 8015 Modified, and <br /> • Benzene,toluene, ethylbenzene and xylenes (BTE&X) and methyl tert-butyl ether(MTBE) <br /> in accordance with EPA Method 8021B <br />' 0 Fuel additives in accordance with EPA Method 8260B — Bid MTBE u),u d-no/ ze4 4i-T ''/A-K <br /> logy 71z41h1 '=r/ <br /> 8u�46, <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 b subtracting the measured depths-to-water from the <br /> Y g � <br /> surveyed casing elevations The average ground water elevation on 20 March 2003 was 39 0 feet— <br /> below mean sea level (MSL), with the average depth to water at 63 9 feet below casing tops The <br /> average ground water elevation in the wells had Increased 15 feet since the Iast ground water <br />' monitoring event Ground water was within the screened Interval of each monitoring well <br /> The shape of the water table at the time of the March 2003 monitoring event was In the form of a <br />' north-plunging trough The net flow of ground water near the former UST location was determined <br /> to be to the east-northeast under an average gradient of 0 0007 ft/ft Figure 3 illustrates the contoured <br /> ground water elevations as measured on 20 March 2003 <br /> 1 � <br />' Advanced GeaEnvironmental,Inc. <br />