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25 September 2000 <br /> AGE-NC Project No 97-0326 <br /> Page 2 of 4 <br /> placed in a chilled container and transported under chain-of-custody to Alpha Analytical <br /> Laboratories, Inc (Alpha Analytical), a State of California Department of Health Services (DHS)- <br /> certified analytical laboratory Each sample was analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> method GCFID 5030, <br /> I • Volatile aromatic hydrocarbons- benzene, toluene, ethylbenzene and total xylenes(BTEX) <br /> with methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8260B, and <br /> • Oxygenated compounds - di-isopropyl ether (RIPE), ethyl tertiary-butyl ether (ETBE), <br /> MTBE, tertiary-amyl methyl ether(TAME) and tertiary butanol (TBA) in accordance with <br />' EPA Method 8260B <br />' 3.0. FINDINGS <br /> • From the field data,AGE was able to infer the ground water flow direction and gradient Laboratory <br /> analysis of three ground water samples detected petroleum hydrocarbons and volatile aromatics all <br /> three samples, oxygenated fuel additives were found in two of the samples (MW I and MW3) <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Ground water was measured at a depth of approximately 31 feet below the tops of the well casings <br /> Iduring the March 2000 monitoring event, within the screened interval of MW2 and MW3, but <br /> approximately 5 feet above the screened interval to MWI The elevation of ground water in each <br /> well was calculated by subtracting the depth to ground water from the well head elevations Ground <br /> water elevations ranged from 15 84 to 15 88 feet below mean sea level (MSL) Ground water data <br /> is summarized on Table 1 <br />' Ground water elevation contours based on the data for the March 2000 monitoring event are <br /> illustrated on Figure 3 The ground water flow direction was south-southeast with a gradient of <br />' 0 0025 ft/ft <br />' 3 2 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected in samples collected from MW1,MW2 and MW3 at concentrations of 89,000 <br />' micrograms per liter (µg/1), 76,000 µg/1 and 240,000 µg/l, respectively Benzene was detected in <br /> • samples from MW1,MW2 and MW3 at concentrations of 3,700 µg/l, 13,000 µg/1 and 23,000 µg/1, <br /> respectively Toluene, ethylbenzene and xylenes were detected at concentrations as high as 23,000 <br /> Advanced GeoEnvironmental,Inc <br /> I <br />