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07 August 2006 AGE-NC Project No. 01-0839 Page 3 of 4 placed on ice and kept in a cooler until delivered to the laboratory for analysis. Chain of custody protocols will be used to document custody transfer of the samples from the field to the analytical laboratory. A chain of custody form will accompany the samples. Ground water and selected soil samples will be analyzed by a California Department of Health Services (DHS)-certified laboratory for: • Total petroleum hydrocarbons quantified as gasoline(TPH-g) in accordance with EPA Method 8015M; and • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and fuel additives methyl tertiary- butyl ether(MTBE),tertiary-butyl alcohol (TBA), di-isopropyl ether(DIPE),ethyl tertiary- butyl ether(ETBE),tertiary-amyl methyl ether(TAME), 1,2-dibromoethane(EDB),and 1,2- dichloroethane (1,2-DCA) in accordance with EPA Method 8260B. Laboratory reports for soil and ground water analyses, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain-of-custody documentation will be presented in a report of findings and recommendations. Following borehole advancement,type I/II portland cement(grout mix) will be utilized to backfill each borehole from total depth utilizing a down-hole tremie pipe. The EHD will be given a 48-hour inspection notice to inspect the grout mix and backfilling activities. SOIL VAPOR EXTRACTION WELLS The shallow and deep SVE wells are proposed to be screened from 15 feet to 30 feet bsg and from 45 feet to 60 feet bsg,respectively(see Figures 6 and 7).AGE has determined that two zones of SVE remediation are necessary to correspond to two apparently distinct sandy intervals(see cross-sections A-A' and B-B' on Figures 3 and 4, respectively). The SVE wells will be installed adjacent to monitoring wells located within the adsorbed petroleum hydrocarbon plume as depicted on Figure 5. Advanced GeoEnvironmental,Inc.