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I <br />' 16 December 2004 <br /> . AGE-NC Project No 97-0249 <br />' Page 3 of 8 <br />' 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain of custody form,placed in a chilled container and <br /> transported to McCampbell Analytical, Inc (MAI), a California Department of Health Services <br /> (DHS)-certified laboratory to be analysis for <br />' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) by EPA Methods 5030/8015Cm, <br />' • Benzene, toluene, ethylbenzene and xylenes (BTEX) by EPA Method 8021B, <br /> • 1,2 Dichloroethane (1,2-DCA), ethylene dibromide (EDB), tertiary butanol (TBA), di- <br /> isopropyl ether (DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether (TAME) and <br />' methyl-tertiary butyl ether(MTBE)by EPA Method 8260B <br />' 3.0. FINDINGS <br />' . Ground water elevations, general flow direction and the estimated gradient were determined from <br /> field data collected on 13 September 2004, the contaminant impact to ground water was quantified <br /> by laboratory analysis of water samples collected on 14 and 15 September 2004 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The 13 September 2004 ground water elevations in wells MW-1 through MW-12 were calculated <br /> by subtracting the measured depth to ground water from the surveyed casing elevation The depth <br />' to ground water measurements varied between 13 25 feet(MW-6)and 16 42 feet(MW-5)below the <br /> top of the well casings, ground water elevations were calculated to be between 3 82 feet(MW-111) <br /> and 4 28 feet(MW-4/MW-5/MW-10B)below mean sea level Generally,groundwater elevation at <br /> the site decreased an average 192 feet between the June 2004 and September 2004 ground water <br /> monitoring events <br /> The ground water elevation data collected from the site was plotted for six informal hydrologic flow <br /> units as defined in AGE's CPT Site Investigation - Fourth Quarter 2001 (dated 15 March 2002) <br /> Hydrologic Units 1, 2 and 6 at Three B's Truck Plaza are laterally equivalent to Flag City's First <br /> Zone, Second Zone, and Primary Aquifer Zone, respectively, with the exception of minor <br /> interpretational differences in location of hydrostratigraphic boundaries,Three B's Hydrologic Units <br /> I 3 and 5 are laterally equivalent to Flag City's Rock Upper Zone and Secondary Aquifer Zone, <br /> respectively <br /> Advanced GeoEnviroamentai,Inc <br />