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I i <br /> 3 I <br /> E ` <br /> 25 May 2001 <br />' AGE-NC Project No 95-0111' <br /> Page 2 of 4 ` <br /> The samples were then labeled and placed in a chilled container for transportation under <br />' chain-of-custody to McCampbell Analytical, Inc (MAI), a California Department of Health Services <br /> (DHS)-certified analytical laboratory located in Pacheco, California Each sample was analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d)by EPA <br /> Methods 5030/8015 Modified and 3550/8015`Modified, respectively, <br />' • Volatile aromatic compounds-benzene,toluene, ethylbenzene and total xylenes(BTEX)and <br /> methyl tertiary-butyl ether (MTBE) by EPA Method 8020, and <br /> • Oxygenated compounds - di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), <br /> methyl tertiary butyl ether(MTBE),tertiary amyl methyl ether(TAME) tertiary butyl alcohol <br /> (TBA) by EPA Method 8260 Modified r <br /> 3.0. FINDINGS , <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 23 March 2001, the contaminant impact to ground water was quantified from the laboratory <br /> analytical data <br />' 3 1 GROUND WATER FLOW DIRECTION AND GRADIENT <br />' The relative ground water elevation in each well was calculated by subtracting the depth to ground <br /> water from the surveyed relative casing elevations The depths to ground water and relative ground <br /> water elevations are tabulated in Table 1 The relative ground water elevations ranged from 9 57 feet <br />' <br /> in MW-6 to 10 88 feet in MW-3 The ground water elevation increased an average of 0 08 feet over <br /> the last quarter <br /> The ground water flow direction was inferred to be toward the north which is consistent with results <br /> obtained from previous quarterly monitoring events conducted The ground water gradient is <br /> approximately 0 007 feet/feet The relative ground water elevation contours are depicted in Figure 3 <br />' 3 2 ANALYTICAL RESULTS tOF GROUND WATER SAMPLES <br /> J I i <br /> TPH-g was detected in the ground water sample collected from MW-1 at 54 micrograms per liter <br /> (µg/1) TPH-d was detected in samples collected from MW-4 and MW-5 at concentrations of 3,200 <br />' µg11, and 3,100 ,ug/l, respectively <br /> ` <br />' Benzene was detected-in the water sample collected from MW-1 at a concentration,of 1 8,yg/1 <br /> Advanced GeoEnvironmental Inc <br />