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%W11 Nd 07 October 2004 AGE-NC Project No. 01-0887 Page 4 of 6 3.2. CPT DRILLING AND SAMPLE COLLECTION AGE proposes to advance four paired CPT soil borings (CPT-1 through CPT-4) at the site as part of the site assessment activities.Proposed CPT soil boring locations are illustrated on Figure 2. The CPT borings will be advanced to characterize lithology and model potential contaminant migration pathways to assess the vertical extent of hydrocarbon-impacted ground water and lateral extent of hydrocarbon-impacted soil. Based on the distribution of hydrocarbons encountered to date during the ongoing investigation,AGE proposes to advance the CPT soil borings in the following locations: • CPT-1 approximately 15 feet east of the current above ground storage tank (AST); • CPT-2 approximately 30 feet west of the former UST location; • CPT-3 approximately 20 feet north of the former UST location; and • CPT-4 approximately 15 feet south of the eastern boundary of the former UST location. The first boring at each location will be a CPT borehole; the CPT will acquire a continuous lithologic record to define the hydrologic units. A second boring, adjacent to the first borehole,will be subsequently advanced to acquire soil and grab ground water samples in targeted zones based on interpreted lithologic data and assessment needs. The borings will be advanced to approximately 50 feet bsg. Total depths of borings may vary according to hydrogeologic conditions encountered during drilling activities. Ground water and selected soil samples will be analyzed by a California Department of Health Services (DHS)-certified laboratory for: • TPH-g, in accordance with EPA Method 8015 Modified; • BTEX and MTBE in accordance with EPA Method 8260; and • Oxygenated fuel additive compounds di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), ethylene dibromide (EDB), and 1,2-dichloroethane (1,2-DCA) in accordance with 8260 Modified. Laboratory reports for soil and ground water analysis, 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. Advanced GeoEnvironmental.Inc.