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31 October 2002 AGE-NC Project No. 96-0254 Page 3 of 7 stained, has a petroleum hydrocarbon odor, or OVM readings above background readings will be considered impacted. It is anticipated that approximately 1,000 cubic yards (1,500 tons) of petroleum-impacted soil and approximately 800 cubic yards(1,250 tons) of potentially uncontaminated shallow subsurface soil will be excavated and stockpiled at the site. Uncontaminated "clean" shallow subsurface soil and contaminated soil will be segregated to allow differing disposal alternatives. It is proposed that "clean" soil with no observed petroleum hydrocarbon staining, odor, or OVM readings will be used to backfill the excavation. The remainder of the excavation will be backfilled to original surface grade with imported clean soil and/or AB road base material. Backfill material will be compacted with the excavation equipment.Field procedures for soil excavation activities are presented in Section 4.2. 3.3.2. Soil Sample Collection and Analysis A total of 28 soil samples will be collected from the excavation and submitted for laboratory analysis. Following RWQCB Tri-Regional Board recommendations, soil samples will be collected from each side wall of the excavation at a minimum interval of every 20 linear feet and from the base of the excavation at a minimum of one sample for every 400 square feet of excavation area. Soil samples collected from the sidewalls of the excavation will be obtained from the depth interval of previously identified petroleum hydrocarbon impacted soil (approximately 5 to 10 feet bsg). Soil samples will be collected from the impacted soil stockpile at a minimum frequency of one four- point composite soil sample for every 100 cubic yards of soil; the proposed sampling frequency is the minimum sampling frequency required for waste profiling and landfill disposal. It is anticipated that approximately 1,000 cubic yards of contaminated soil will be excavated resulting in a total of up to 10 soil stockpile samples to be submitted for laboratory analysis.Disposition of excavated soil will be determined based on the results of the proposed soil stockpile sample analysis. Field procedures for collection of soil samples are presented in Section 4.3. The samples collected from the excavation area will be analyzed for: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Method 8015 modified; and • Benzene, toluene, ethyl benzene and total xylenes (BTEX) and fuel additives including mehtyl tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), di-isopropyl ether (DIPE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B. Advanced GeoEnvironmental,Inc.