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19 November 2004 <br /> • AGE-NC Project No 99-0559 <br />' Page 3 of 7 <br /> hydrochloric acid as a sample preservative,care was taken to ensure that visible air bubbles were not <br /> present in the vials after filling and capping Ground water sample containers were properly labeled, <br /> placed in a chilled container and transported under chain of custody protocol to Cal Tech <br />' Environmental Laboratories (CTEL), a California Department of Health Services-certified <br /> laboratory, for analysis The ground water samples were analyzed for the following <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, and <br />' • Benzene, toluene, ethylbenzene and xylene (BTEX) and the fuel additives tertiary butanol <br /> (TBA), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl <br /> ether (TAME), methyl tertiary-butyl ether (MTBE), ethylene-dlbromide (EDB) and <br /> 1,2-dichloro ethane (1,2-DCA) in accordance with EPA Method 8260B <br />' 30 FINDINGS <br />� . Ground water elevation, flow direction and gradient were determined from field data collected <br /> during the monitoring event, the contaminant impact to ground water was quantified by laboratory <br /> analysis of the ground water samples <br /> 1 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> rThe elevation of ground water in each monitoring well at the time of the monitoring event was <br /> calculated by subtracting the depth to ground water from the surveyed casing elevation, current and <br /> r historical ground water elevation results are provided in Table 1 Each ground water elevation is <br /> grouped according to the HU on the assumption that the elevation will reflect hydrostatic conditions <br /> within the designated HUs <br /> r <br /> rHU 1 and HU2 <br /> The depth to ground water In monitoring wells MW-1 through MW-3 was below the casing and the <br /> rwells were considered dry, while the depth to ground water measured in wells MW-4 and MW-5A <br /> through MW-7A ranged between 62 90 and 65 70 feet below the top of casing (btoc) The ground <br />' water elevation was calculated between 37 96 feet (MW-7A) and 40 20 feet (MW-4) below mean <br /> sea level (MSL), the ground water elevation decreased approximately 2 9 feet since the June 2004 <br /> monitoring event In the multi-level wells and almost 5 35 feet since June 2004 in well MW-4 The <br /> Advanced GeoEnvironmental,Inc <br />