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I r A ' 30 August 2004 AGE-NC Project No 99-0592 Page 8of13 of Paramount, a State of California Department of Health Services (DHS)-certified laboratory (#2424) All samples were analyzed for TPH-g and TPH-d in accordance with EPA Method 8015-Modified, and - BTEX and the fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, TAME, TBA, methanol, ethanol, 1,2 dibromoethane (EDB) and 1,2-DCA in accordance with EPA Method 8260B 4 All rinseate generated during drilling activities was containerized in properly labeled DOT-approved 55-gallon drums and stored on-site in an area lacking public access The twin soil boring was backfilled over the entire depth with a portland cement grout mix I - 5.0. FINDINGS The computer-generated CPT lithologic logs were integrated with previous subsurface soil descriptions to construct the subsurface geological model, the hydrocarbon impact to ground water and soil was quantified by laboratory analysis of the grab ground water and soil samples, as lie presented below 51 STRATIGRAPHY Based on the findings from the CPT soil soundings,cross section A-A'was updated to depict general lithology beneath the site (Figure 4) Cross sections B-B' (Figure 5) and C-C' (Figure 6) show the lithology in other areas beneath the site along the lines of section shown on Figure 2 Dominantly fine-grained soil consisting of clay,clayey silt,silty clay and stiff fine-grained soils were encountered at depths from the near surface to approximately 57 feet bsg Significant sand units with variable gravel were encounteredT from 57 feet bsg to 67 feet and 82 to 85 feet bsg Thin layers of '7 5�' sand were encountered at 78 feet and 80 fee Between the two main sand layers, t e soil was predominantly silt and sandy silt Below 85 feet bsg, clayey silt and stiff fine-grained soils were .,� ` primarily encountered CPT,computer-generated boring logs are included in Appendix D 1p* 5 2 HYDROGEOLOGICAL MODEL Based on the CPT results, AGE has developed a preliminary subsurface model of the site sediment stratigraphy comprised of six informal zones a vadose (unsaturated) zone and five hydrological units Hydrological units may be defined as significant vertical intervals of soil having significant I. Advanced GeoEnviron mental,Inc 4 I}