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, <br /> August 2005 = <br /> !.' AGE-NC-Project No. 95-0106' <br />' Page 2 of 4. . <br /> The' samples' were transported •iii a chilled container under. :chain, of custody to Cal Tech . <br /> Environmental Laboratories (CTEL), a State of California Department of Health.Services (DHS)- . <br /> ' ceitified analytical laboratory, and.analyzed for:' <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with <br /> EPA"Method 861'5-Modified; - <br /> Benzene, toluene, ethylbenzene and xylenes.'(BTEX); and fuel additives methyl tertiary <br /> butyl.ether(MTBE),tertiary butyl alcohol(TBA);di isopropyl ether(DIPS),ethyl tertary <br /> butyl ether(ETBE),tertiary-amyl methyl ether(TAME), 1;2-dibromoethane(EDB),and 1'2- <br /> dichloroethane (1,2-DCA) in accordance with EPA Method 8260B. <br /> 3.0. FINDINGS <br />' Ground water elevation and flow direction were inferred from field data. The hydrocarbon.-impact <br /> to-ground water was quantified by laboratory analysis of the groundwater samples' <br /> 3.1 GROUND WATER ELEVATION AND FLOW DIRECTION <br /> The relative depth to ground water ranged from 4.81 feet(MW-4)to 7.42 feet(MW-6 lower).'The <br /> average ground' water elevation was approximately 33.51 feet above mean sea level (MSL),, <br /> increasing approximately 0.58 feet since the December 2004 monitoring event. The water table <br />' appears as'a northerly plunging'i dge,the east and west limbs of the ridge,flow toward thenortheast <br /> and northwest, respectively, at a gradient of approximately 0.006 foot/foot (ft/ft), while the flow . <br /> gradient at the center of the ridge is steeper at approximately-0:01't/ft.toward the north:, Ground'' <br /> water elevation data is presented in Table 1 acid the contoured ground water elevation data is shown <br /> on Figure,3. 7 ; <br /> 3.2. ANALYTICAL RESULTS.OF:GROUNDWATER SAMPLES <br />' the sample collected' <br /> TPH-g was detected at concentration'of 4,100 micrograms'per liter (pg/ <br /> m e <br /> from well.MW-4. : <br /> BTEX compounds were detected in the samples collected from wells MW-1 and MW-4-at-the <br /> following coneentrations:-25 µg/1(MW-1)and,46 µg11 (MW-4)benzene, 5.3 µg/,l (MW-4)toluene,', <br /> 75 µgll (MW-4),ethylbenze'ne and' 105 µg/l (MW-4)'xylenes. <br /> Advanced GcoEnvironmcntal,Inc. . <br />