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'— 17 Apnl 2002 - _ - <br /> - AGE-NC Prol ccNo 98-0521 - <br /> Page 2 of 4 <br /> Y2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES - <br /> — Prior to collection of ground water samples, the depth to ground water was again measured in each <br /> well to ensure that a minimum of 80%of the Initial well volume had recharged Water samples were <br /> collected from each well using a new disposable plastic bailer and were transferred Into three 40-m1 <br /> volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid (18%) as a sample r <br /> ' preservative The samples were then labeled and placed in a chilled container for transportation <br /> under_chain-of-custody-to McCampbell Analytical, Inc, 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- <br /> g <br /> _ ) in accordance with EPA <br /> -_ Method 8015 Modified, . <br /> -'} - Benzene, toluene, ethyl benzene and total xylene (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA method 8020, <br /> • The oxygenated compounds di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> __ = _MTBE, tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol, <br /> --_ ethylene dibromide (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 /> 3 1 GROUND WATER ELEVATION,FLOW DIRECTION AND GRADIENT <br /> ' On 13 March 2002,the depth to ground water at the site ranged from 7 29 to 7 83 feet below the tops <br /> - <br /> p <br /> of the well casings The ground water elevations at the site ranged from 6 97 feet to 7 50 feet below <br /> -mean-sea level-(MSL) The ground water flow was directed toward the northeast with a hydraulic <br /> =gradient calculated to be 0 011 foot/foot Depth to water and ground water elevation are summarized <br /> _ in Table 1 Figure 3 illustrates the contoured ground water elevations <br /> f -- <br /> Advanced CeoEnvironmental,Inc <br />