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16 September 2004 <br /> AGE-NC Project No 97-0249 <br /> Page 3 of 8 <br /> I2 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 for 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 xylene (BTEX) by EPA Method 8021B, <br /> • 1,2-Dichloroethane (1,2-DCA), ethylene dibromide (EBD), 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 14 June 2004, the contaminant Impact to ground water was quantified by <br /> laboratory analysis of water samples collected on 15 and 16 June 2004 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The 14 June 2004 ground water elevation at wells MW-1 through MW-12 were calculated by <br /> subtracting the measured depth to ground water from the surveyed casing elevation The depth to <br /> ground water measurements varied from the purged wells between 11 00 feet(MW-6)and 14 42 feet <br /> (MW-7E)below the top of well casings, ground water elevation was calculated to be between 1 76 <br /> feet (MW-11B) and 2 34 feet(MW-1OF)below mean sea level Generally, ground water elevation <br /> at the site decreased an average 1 18 feet between the March 2004 and the June 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 GeoEnvironmental,Inc <br />