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' 22 August 2000 <br /> AGE-NC Project No 98-0540 <br /> Page 2 of 3 <br /> A r j <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) In accordance with EPA <br />' Methods 5030/8015m, <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> and methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 602/8020, and <br />' <br /> • Oxygenated fuel additives MTBE tertiary ary 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 /> y I <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were deducted from field data, hydrocarbon-Impact to <br /> ground water was assessed by laboratory analysis of the ground water samples <br /> I <br /> 3 1 GROUND WATER GRADIENT AND'FLOW DIRECTION <br /> The relative elevation of ground water in each well was calculated by subtracting the depth to ground <br /> water from the surveyed relative casing elevations (Table 1) Depths to ground water ranged from <br /> I 72 24 feet to 72 33 feet below the tops of the well casings Ground water elevations at the site ranged <br /> from 15 55 feet in MW-1 to 15 59 in MW-3 below mean sea level The ground water gradient was <br /> calculated to be 0 002 ft/ft directed N 62° E <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected in the ground water samples collected from MW-1 and MW-3 at concentrations <br /> of 2,600 micrograms per liter (4g/1) and 440,ug/l, respectively <br /> The BTEX compounds were detected in the groundwater samples collected form MW-1 and MW-3 <br /> at concentrations as high as 27 4g11, 15 Mg/l, 56 µg/l, and 310 gg/l, respectively <br /> IMTBE was not detected above laboratory reporting limits by EPA Method $020 or 8260 in any of <br /> the ground water samples collected and analyzed TBA was detected in the ground water sample <br /> collected from MW-1 at a concentration of 32 ,ug/l No other fuel oxygenated compounds were <br /> detected above laboratory reporting limits (Table 2) <br /> No contaminants were detected above laboratory reporting limits in the' ground water sample <br /> • collected from the domestic well on site <br /> Advanced GeoEnvironnmental,Inc <br /> I i F <br /> f <br />