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' 31 May 2005 . AGE-NC Protect No 04-1239 ' Page 2 of 7 sample sleeves were labeled, stored on Ice, and transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a State of California Department of Health Services (DHS)- certified analytical laboratory, for analysis Selected soil samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline(TPH-g) in accordance with EPA Method 8015 Modified, and ' ' • Benzene,toluene,ethylbenzene, and total xyleries(BTEX)and fuel oxygenates di-isopropyl ether (DIPE), methyl tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dichloroethane (1,2- DCA), and 1,2-dibromoethane (EDB) by EPA Method 8260B ' The sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to minimize cross-contamination ' 212 Logging gg g Soil was extruded from a remaining brass sleeve and visually described in accordance with the Unified Soil Classification System (USCS, see Appendix B for boring logs) 2 13 Well Completions ' Pilot borings MW-9 through MW-11 were completed as ground water monitoring wells of the same designations using 2-Inch diameter, Schedule 40 polyvinylchlonde(PVC)casing with a 0 020-inch slotted screen installed from 20 feet to 40 feet bsg The filter pack (No 3 Lonestar sand) was installed from 18 feet to 40 feet bsg,and a nominal 2-foot bentonite chip plug was installed above the filter pack and hydrated The remaining annular space was filled to near the surface with a I portland cement grout mix and water-tight, traffic-rated well boxes were installed over the wells As-built well diagrams are depicted on the boring logs in Appendix B 2 14 Monitoring Well Development IIS On 06 April 2005, monitoring wells MW-9 through MW-11 were developed utilizing a Waterra inertia pump and steel bailer Ground water was purged from each monitoring well until it was visually sediment-free Approximately 32 to 27 gallons of water were removed from wells MW-10 and MW-11,well MW-9 drew down after 33 gallons had been evacuated Purged ground water was containerized in properly labeled, DOT-approved 55-gallon drums and stored on-site Monitoring Advancer)GeoEnvironmental,Inc