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15 January 2007 AGE-NC Project No. 99-0669 Page 3 of 10 located approximately 10 to 20 feet west of existing BAS well MW-8; • Clustered wells MW-15 and MW-16 will each be single-completed within HU2 (screened between 40 and 50 feet) and HU4 (screened between 70 and 80 feet), respectively, and located approximately 40 to 60 feet northeast of existing BAS well MW-10; • Clustered wells MW-17 and MW-18 will each be single-completed within HU2 (screened between 40 and 50 feet) and HU4 (screened between 70 and 80 feet), respectively, and located approximately 5 to 15 feet west of existing BAS well MW-9; • Clustered wells MW-19 and MW-20 will each be single-completed within HU2 (screened between 40 and 50 feet) and HU4 (screened between 70 and 80 feet), respectively, and located approximately 140 to 160 feet north of existing BAS well MW-9; • Clustered wells MW-21 and MW-22 will each be single-completed within HU2 (screened between 40 and 50 feet) and HU4 (screened between 70 and 80 feet), respectively, and located approximately 70 to 90 feet north-northwest of existing Chevron well MW-11 and; • Clustered wells MW-23 and MW-24 will each be single-completed within HU2 (screened between 40 and 50 feet) and HU4 (screened between 70 and 80 feet), respectively, and located approximately 280 to 300 feet north-northwest of existing Chevron well MW-11. The proposed monitoring wells installed within hydrogeologic unit HU2 shall be advanced to approximately 50 feet bsg; the monitoring wells installed within hydrogeologic unit HU4 shall be advanced to approximately 80 feet bsg.All wells will be advanced utilizing a truck-mounted,hollow stem drill rig(limited access CME-75,a CME-75HT or CME-95)equipped with 8.25-inch diameter hollow-stem augers. Total depths of borings may vary according to site conditions encountered during drilling. Proposed well locations are depicted in Figure 2. Well installation procedures are described in Section 3.1.; well completion details are described in Sections 3.1.1. Soil samples will be collected only from the wells installed within HU-4 at five-foot intervals beginning at 15 feet bsg to the total depth of the pilot borings. Selected soil samples will be analyzed by a State of California Department of Health Services(DHS)-certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified; • Volatile aromatic compounds-benzene,toluene,ethylbenzene and total xylenes(BTEX)in accordance with EPA Method 8260 and; • Fuel additives tertiary butyl alcohol(TBA),di-isopropyl ether(DIPE),methyl tertiary butyl ether (MTBE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), Advanced GeoEnvironmenlal,Inc.