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v I 5 <br /> + l <br /> I 26 January 2003 ' <br /> AGE-NC Project No 98-0521 1 <br /> Page 2 of 4 ' <br /> o <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 /> Method 8015 Modified, <br /> 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 /> I <br /> r <br /> 3.0. FINDINGS <br /> ' . The ground water flow direction and gradient were inferred from the field data Dissolved petroleum <br /> hydrocarbon impact to ground water was quantified by laboratory analysis of samples,collected <br /> J { <br /> I ' 3 1 ' GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br /> On 11 December 2002,the depth to ground water at the site ranged from 8 17 to 8 55 feet below the <br /> ` tops of the well casings The ground water elevations`at the'site ranged from 7 85 feet (MW-1) to <br /> ' 8 22 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 0 011 foot/foot Depth to water and ground water <br /> elevation are summanzed'in Table'l Figure 3 illustrates the contouredground water elevations <br /> � �I s <br /> ' IIi< r4 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> I � I <br /> The results of the December 2002 monitoring event are as follows <br /> ' ► , TPH-g was detected 1n the sample collected from monitoring well MW-4 at a`concentration <br /> ' of 450 micrograms per Iiter (µg/l)„TPH-g was not detected in the samples collectcd from <br /> II monitoring wells MW-1; MW-2 and MW-3 k' <br /> , Y <br /> 1 <br /> r <br /> ' r Advanced GeoEnvlren mental,Inc I' <br /> 14 <br />, p'r <br />