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16 July 2003 <br /> • AGE-NC Project No 98-0521 <br /> ' Page 2 of 4 <br /> ' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Prior to collection of ground water samples,.the depth to ground water was measured again in each <br /> well to ensure that a minimum of 80%of the initial well volume had recharged A water sample was <br /> collected from wells MW-1,MW-3 and MW-4 using a new disposable plastic bailer,awater sample <br /> was collected froni the discharge tube In well MW-2 The samples were transferred into three 40-m1 <br /> volatile organic analysis (VOA) vials containing 0 5 ml hydrochlonc acid (18%) as a sample <br /> Preservative The samples were then labeled and placed in a chilled container for transportation <br /> under chain-of-custody to McCampbell Analytical Inc (MAI), a California Department of Health <br /> ' Services-certified laboratory Ground water samples were analyzed for the following <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g ) in accordance with EPA <br /> 1Method 8015 Modified, <br /> e Benzene, toluene, ethyl benzene and total xylene (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 8021B, and <br /> ' + The fuel additives di-isopropyl. ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol, <br /> 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260B <br /> 3.0. FINDINGS <br /> ' The groundwater flow direction and gradient were inferred from the field data Dissolved petroleum <br /> hydrocarbon impact to ground water was quantified by laboratory analysis of the samples collected <br /> ' WATER ELEVATION FLOW DIRECTION AND GRADIENT <br /> 31 GROUND , <br /> ' On 21 March 2003,the depth to ground water at the site ranged from 7 44 to 7 99 feet below the tops <br /> of the well casings The ground water elevations at the site ranged from 7 12 feet (MW-1) to <br /> 7 66 feet (MW-2) below mean sea level (MSL) The ground water flow was directed toward the <br /> northeast with a hydraulic gradient calculated to be 0 012 foot/foot Depth to water and ground water <br /> elevation are summarized in Table 1 Figure 3 illustrates the contoured ground water elevations <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> The results of the March 2003 monitoring event are as follows <br /> Advanced GeoEnrrronmental,Inc <br /> 1 <br />