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I w k <br /> f ' <br /> k <br /> 04 April 2000 <br /> AGE-NC Project No 95-0142 <br /> Page 2 of 4 <br /> 22 GROUND WATER SAMPLE COLLECTION <br /> Water samples were collected from each purged well using new, clean, disposable plastic bailers <br /> Immediately upon retrieval, the samples were transferred into EPA-approved 40-m1 VOA vials - k <br /> Icontaining 0 5 milliliter hydrochloric acid (18%) as a sample preservative The vials were then <br /> labeled and placed in a chilled container The samples were transported under chain-of-custody to <br /> MAI for analysis Ground water samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> Y <br /> • <br /> Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> with methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8020, and <br /> IOxygenated fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> methyl tertiary-butyl ether(MTBE), tertiary-amyl methyl ether(TAME) and tertiary butanol <br /> (TBA) in accordance with EPA Method 8260 Modified, respectively <br /> 30 FINDINGS <br />' Ground water flow direction and gradient were calculated from the field data The current <br /> distribution of dissolved petroleum hydrocarbons was inferred from laboratory analytical results of <br /> the ground water samples <br /> 1 , 1 <br /> 3 1 GROUND WATER GRADIENT AND DIRECTION <br /> Depth to ground water at the site ranged from 26 06 feet to 27 92 feet below the tops of the well <br /> casings The relative ground water elevation at the site ranged from 71 82 feet to 71 95 feet The <br />' elevation and ground water depth data is depicted in Table 1 During the January 2000 monitoring <br /> event, ground water flow direction appeared to be northwest and southeast, but the very low gradient <br /> causes distortions of the contour lines The relative elevation-of the ground water surface at the site <br />' is illustrated on Figure 3 <br /> L <br />' 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was reported in samples collected from wells MW-6 and VW-1 through VW-4 at <br /> concentrations ranging from, 160 micrograms per liter (µg11, VW-2) to 230,000 µg11 (VW-1) <br />' Advanced GcoEnvironmental,Inc <br /> 1 <br />