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09 May 2003 <br /> AGE-NC Project No 99-0559 <br /> IPage 3 of 7 <br />' Following sample collection,the samples were placed in laboratory-supplied containers,labeled and <br /> were transported under chain-of-custody to CalTech Environmental Laboratories (CTEL), a <br /> California Department of Health Services (DHS)-certified. laboratory The water samples were <br /> analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 5030/8015 Modified, <br /> • Benzene,toluene,ethylbenzene and total xylenes(BTEX),the fuel additives methyl tertiary- <br /> butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br />' tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), ethylene dibromide (EDB), <br /> 1,2-dichloroethane (1,2-DCA), methanol and ethanol, and selectively were detected the <br />' solvent trichloroethene(TCE) in accordance with EPA Method 8260 B <br /> All nnseate generated during drilling activities was containerized inproperly 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 bentomte/portland cement grout mix <br /> I • <br /> 3.0. FINDINGS <br /> rComputer generated CPT soil descriptions augmented with previously obtained soil sample and CPT <br /> soil descriptions were utilized to construct the vertical and lateral geologic model,laboratory analysis <br /> of ground water samples was utilized to assess the hydrocarbon-impact on the dissolved media <br /> 31 STRATIGRAPHY <br /> Based on the soil descriptions from CPT and previous soil boring logs, interpretive cross sections <br />' were constructed,to depict the general hydrogeologic framework beneath the site (Figure 3 and 4) <br /> The site vadose zone currently extends from the ground surface to 60 feet bsg (water table),and is <br />' composed of silt,clayey silt,clay, and `stiff fine grained' sediments A gravelly, fine to coarse sand <br /> layer which apparently pinches out towards the southwest was identified at between 50 and 60 feet <br /> bsg <br /> Below the vadose zone, the lithology is composed dominantly of silty fine sand, sandy silt, clayey <br /> silt to silty clay and clay Significant sand intervals were identified at between 90 and 110 feet bsg <br /> and between 165 and 170 feet bsg CPT computer-generated baring logs are included in Appendix A <br /> • <br /> I <br /> Advanced GeoEnvironmental,Inc <br />