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26 November 2003 <br /> AGE-NC Project No 98-0465 <br />' Page 2 of 4 <br /> 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> I <br /> Water samples were collected from the purged wells using new disposable plastic bailers after <br />' allowing the wells to achieve a mmimunn 80%recovery of the pre-purge water volume Each water <br /> sample was transferred into three 40-m1 volatile organic analysis(VOA)vials containing 0 5 ml 18% <br /> hydrochloric acid as a sample preservative and one 1-liter amber bottle with no sample preservative <br /> After collection, the samples were properly labeled, placed in a chilled container and transported <br /> under chain-of-custody to Cal Tech Environmental Labratones, Inc (CTEL) for analysis The <br /> samples were analyzed for <br />' <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> 'accordance with EPA Method 8015-modified, <br /> • Benzene, toluene, ethylbenzene and xylenes (BTE&X) in accordance with EPA Method <br /> 8260B, and <br />' Fuel oxygenates methyl tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl <br /> tertiary-butyl ether(ETBE),tertiary-amyl methyl ether(TAME),and tertiary butanol(TBA) <br /> in accordance with EPA Method 8260B <br />' 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br />' 15 October 2003 The contaminant impact to ground water was quantified by the laboratory <br /> analytical data <br /> 1 1 t L <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' At the time of the October 2003 sampling event, depths to ground water ranged from 12 65 feet to <br /> 13 70 feet below the tops of the well casings During this monitoring event, the ground water level , <br />' in the wells was approximately 7`65 to 8 70 feet below the tops of the well screens, indicating that <br /> the wells are screened properly and yield representative shallow ground water samples <br />' Ground water elevations at the site ranged from 9 91 feet below mean sea level(MS L)in wells MW3 <br /> and MW4 to 10 06 feet below MSL in well MW2(Table 1) Ground water elevations at the adjacent <br /> site (Sanchez Property) ranged from 10 16' feet below mean sea level (MSL) in well MW4 and <br />' MW7B to 10 31 feet below MSL in well MW6B (Table 1) <br /> Advanced GeoEnvironmental,Inc <br /> I - a <br /> 5 + <br />