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1 <br />' 30 March 2001 <br /> . AGE-NC Project No 98-0452 <br /> Page 2 of 3 <br />' 2 2 COLLECTION AND LABORATORY ANALYSIS S S OF GROUND WATER SAMPLES <br />' Following purging and allowing a rrunimum of 80% recovery of initial water volume in the wells, <br /> water samples were collected from each purged well using new disposable plastic bailers <br />' Additionally, a water sample was collected from domestic well DW-1 Each water sample was <br /> transferred into laboratory-supplied 40-ml VOA vials containing 0 5 ml 18% hydrochloric acid as <br /> a sample preservative, and into 1-liter glass amber bottles without a preservative After collection, <br />' the samples were properly labeled, placed in a chilled container and transported under chain-of- <br /> custody to McCambell Analytical Laboratories, Inc and were analyzed for <br />' • Total petroleum hydrocarbons quantified as diesel(TPH-d) in accordance with EPA Methods <br /> 3550/8015M and <br /> • Oxygenated fuel additives-MTBE, tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), <br /> ethyl tertiary butyl ether(ETBE), and tertiary amyl methyl ether(TAME) in accordance with <br /> EPA Method 8260-Modified <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to <br /> ground water was assessed by laboratory analysis of the ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> I from the surveyed well head elevations (Table 1) Depths to ground water ranged from 4 35 feet to <br /> 5 03 feet below the tops of the well casings Ground water elevations at the site ranged from-0 82 <br /> feet in MW-1 to-4 35 in MW-3 relative to mean sea level The ground water gradient was calculated <br /> to be 0 002 ft/-ft with a flow direction toward the north-northeast (Figure 3) <br /> I3 2 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-d was not detected above laboratory reporting limits in the four ground water samples analyzed <br /> MTBE was detected by EPA Method 8260 modified in the ground water samples collected from <br /> MW-1, MW-2, MW-3 and DW-1 at concentrations of 2 1 micrograms per liter (µg/1), 29 µg/l, 48 <br /> µg/1 and 1 2 µg/1, respectively <br /> The ground water samples collected during the March 2001 sampling event were not analyzed for <br /> Advanced GeoEnvironmentai,Inc <br />