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06 June 2003 <br /> AGE-NC Protect No 95-01.35 , <br /> Page 3 of 7 °Y <br /> (CTEL) of Paramount, a State of Califorma Department of Health Services (DHS)-certified <br /> I laboratory(#2424) All samples were analyzed for <br /> Total,petroleum hydrocarbons quantified-as gasoline (TPH-g) in accordance with EPA <br /> Method $015-Modified, and <br /> r <br /> Benzene, toluene, ethylbenzene and total xylenes (BTEX) and the fuel additives methyl <br /> tertiary-butyl ether MTBE, di-Isopropyl ether (DIPE), ethyl tertiary--butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME), tertiary butanol (TBA), ethylene dibromide (EDB) and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260-Modified <br /> i <br /> All nnseate generated dunng dnllinglactivities was containerized in properly labeled DOT-approved <br /> i 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 portland cement grout mix <br /> i3.0. FINDINGS <br /> The computer-generated CPT lithologic logs were Integrated with previous subsurface soil <br /> descriptions to construct the subsurface geological model,the hydrocarbon Impact to ground water <br /> and soil was quantified by laboratory analysis of the grab ground water and soil samples, as <br /> ipresented below <br /> 31 STRATIGRAPHY <br /> Based on the findings from the CPT soil borings and existing monitoring well and soil borings,cross <br /> sections A-A' was constructed to depict general lithology beneath the site (Figure 3) <br /> Dominantly fine-grained soil consisting of silt, clayey silt, silty clay and clay were encountered at <br /> depths from the near surface to approximately 110 feet bsg Generally thin, laterally discontinuous <br /> sand and cemented sand units were encountered at 25 feet bsg In CPT3, 90 feet bsg in CPT1 and r <br /> CPT3 and at 100 feet bsg in CPT3, significant sand units with variable gravel were encountered <br /> below 110 feet bsg CPT computer-generated boring logs are Included in Appendix A <br /> 3 2 HYDROGEOLOGICAL MODEL <br /> I Based on the CPT results, AGE has developed a preliminary subsurface model of the site sediment <br /> stratigraphy comprised of four infonnal vertical zones, a vadose (unsaturated) zone and three <br /> i Advanced GmEnvironmental,Inc. <br />