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