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I <br />' 23 May 2003 <br /> AGE-NC Project No 95-0184 <br />' Page 3 of 9 <br /> • CPT-3 was sampled at 56 to 60 feet,92 to 96 feet, 115 to 119 feet, 154 to 158 feet and 176 to <br />' 180 feet bsg <br />' Following sample collection, the samples were placed in laboratory-supplied containers, properly <br /> labeled and transported under chain-of-custody to McCampbell Analytical, Inc (MAI), a State of <br /> California Department of Health Services (DHS)-certified laboratory in Pacheco, California The <br />' samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d)by EPA <br />' Method 8015 Modified, and <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tert butyl ether <br />' (MTBE)by EPA Method 8021, and <br /> • Volatile organic compounds (VOCs), BTEX with fuel oxygenates, including di-isopropyl <br />' ether(DIPE), ethyl tertiary-butyl ether(ETBE),MTBE,tertiary-amyl methyl ether(TAME) <br /> tertiary butyl alcohol(TBA), 1,2-dichloroethene(1,2-DCA)and 1,2-dibromoethane(EDB), <br /> in accordance with EPA method 8260B Full Scan <br /> All rinseate generated during drilling activities was contamenzed in properly labeled DOT-approved <br />' 55-gallon drums, and was stored on-site in an area lacking public access The twinned soil borings <br /> were backfilled over its entire depth with a bentonite/portland cement grout mix <br />' 3.0. FINDINGS <br />' Soil parameters from the CPT report, supplemented with soil-boring data from previous site <br /> investigations,were utilized to construct the vertical and lateral'geologic and hydrogeologic models, <br /> the contaminant impact to ground water was quantified from the laboratory analytical data obtained <br />' from the investigation <br />' 31 STRATIGRAPHY <br /> all 66 <br /> Based on tV findings from the CPT soil borings and existing monitoring well and soil borings,cross <br />' sections AA' and CC' were constructed to depict general lithology beneath the southern portion of <br /> the site (Figures 3 and 4) <br />' The subsurface stratigraphy is composed predominantly of interbedded fine-grained soil, mainly <br /> . clay, silty clay, clayey silt and silt, the amount of clay in subsurface soil possibly increases off-site <br /> towards the east (FigureA Interbedded sand layers generally appear as fine grained or cemented, <br /> Advanced CeoEnvironmental,Inc <br /> I <br />