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` r <br /> • ' 15 June 2004 k <br /> AGE-NC Project No 98-0465 <br />' Page 2 of 4 <br /> r <br /> 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from the purged wells using new disposable pldstic bailers after <br /> 'allowing the wells to achieve a minimum 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 Laboratories, Inc (CTEL) for analysis The <br /> samples were analyzed for ` <br /> 1 • ' 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 (BTEX) in accordance with EPA Method <br /> 8260B, and <br />' Fuel oxygenates methyl tertiary-butyl ether (MTBE), dl-isopropyl ether (DIPE), ethyl <br /> tertiary-butyl ether(ETBE),tertiary-amyl methyl ether(TAME), and tertiary butanol(TBA) <br /> lie 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 /> 1 - 15 Apnl 2004 The contaminant impact to ground water was quantified by the laboratory analytical <br /> data <br /> r, <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the April 2004 sampling event, depths to ground water ranged from 9 70 feet to <br /> 10 69 feet below the tops of the well casings During this monitoring event,the ground water-level <br /> in the wells was approximately 4 7 to 5 69 feet below the tops of the well screens,indicating that the <br />' wells are screened properly and yield representative shallow ground water samples <br /> s <br />' 'Ground"water elevations at the site ranged from 6 93 feet below mean sea level(MSL)in well MW3 <br /> to 7 05 feet below MSL in well MW2 (Table 1,)` Ground water elevations at the adjacent site <br /> (Sanchez Property) ranged from 6 97 feet below mean sea level (MSL) in well MW5 to 7 17 feet <br /> below MSL in well MW6A (Table 1) , <br /> Advanced Geo Environmental,Inc <br /> i i r i <br /> i <br /> f } <br /> T f <br />