Laserfiche WebLink
r <br /> r07 September 2005 <br /> AGE-NC Project No 97-0249 <br /> rPage 3 of 8 <br /> r2 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 /> r transported to McCampbell Analytical, Inc (MAI), a California Department of Health Services <br /> (DHS)-certified laboratory to be analysis for <br /> r • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) by EPA Methods 5030/8015Cm, <br /> r • Benzene, toluene, ethylbenzene and xylenes (BTEX) by EPA Method 8021 B, <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 /> rmethyl-tertiary butyl ether (MTBE) by EPA Method 8260B <br /> r3.0. FINDINGS <br /> r Ground water elevations, general flow direction and the estimated gradient were determined from <br /> field data collected on 28 March 2005, the contaminant impact to ground water was quantified by <br /> laboratory analysis of water samples collected on 29 and 30 March 2005 <br /> r <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> r The 28 March 2005round water elevations in wells MW-1 through MW-12 were calculated b <br /> g g Y <br /> r subtracting the measured depth to ground water from the surveyed casing elevation The depth to <br /> ground water measurements varied between 6 88 feet (MW-6) and 10 45 feet (MW-7E) below the <br /> top of the well casings, ground water elevations were calculated to be between 1 63 feet(MW-1 OF) <br /> r and 2 40 feet(MW-5)above mean sea level Generally, ground water elevation at the site increased <br /> an average 3 36 feet between the December 2004 and March 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 /> interpretational differences in location of hydrostratigraphic boundaries,Three B's Hydrologic Units <br /> 3 and 5 are laterally equivalent to Flag City's Rock Upper Zone and Secondary Aquifer Zone, <br /> respectively <br /> Ground water elevation data collected from Flag City Chevron wells MW-9(A-C),MW-11 (A-D), <br /> IAdvanced GeoEnviroamentaf,Inc <br />