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' 17 January 2006 <br /> • AGE-NC Project No 97-0249 <br />' Page 3 of 8 <br /> not present in the vials after filling and capping Ground water sample containers were labeled with <br />' the well designation, date, time, and sampler's initials <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 Cal Tech Environmental Laboratories (CTEL), a California Department of Health <br /> Services (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 8260B, and <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 /> 10 <br /> 3.0. FINDINGS <br /> 1 Ground water elevations, general flow direction and the estimated gradient were determined from <br /> field data collected on 26 September 2005, the contaminant impact to ground water was quantified <br /> by laboratory analysis of water samples collected on 26 and 27 September 2005 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The 26 September 2005 ground water elevations in the wells were calculated by subtracting the <br />' measured depth to ground water from the surveyed casing elevation The depth to ground water <br /> measurements varied between 10 10 feet and 14 72 feet below the top of the well casings, ground <br /> water elevations were calculated to be between 129 feet (MW-9B) and 2 66 feet (MW-4) below <br />' mean sea level On 26 September 2005 ground water elevations at the site averaged 1 56 feet below <br /> MSL Ground water elevations at the site decreased an average 3 20 feet between the June 2005 and <br />' September 2005 ground water 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 /> Advanced GeoEnvironmcntal,Inc <br /> 1 <br />