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' 18 November 2005 <br /> AGE-NC Project No 02-0962 - <br /> Page 2 of 7 <br /> Soil samples were collected ahead of the drill bit using a California modified, 18-inch split-spoon <br /> sampler loaded with three pre-cleaned, 2-inch by 6-inch brass sleeves The samples were collected <br /> t from the pilot borings at 5-foot intervals, beginning at 5 feet bsg, using a 140-pound hammer to ' <br /> --advance the sampler The number of blows required-to advance the sampler-over each 6-inch <br />' Increment of the 18-inch sampling interval was recorded on the boring Iogs After sample recovery, <br /> both ends of the middle sleeve were covered with Teflon sheets, capped, and sealed with tape The <br />' sample sleeves were labeled, stored on ice, and transported under chain of custody to Cal Tech <br /> Environmental Laboratories (CTEL), a State of California Department of Health Services (DHS)- <br /> certified analytical laboratory in Paramount, California Selected soil samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) in accordance with EPA Method 8015 Modified, and , <br />' • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and fuel oxygenates di-isopropyl <br /> ether (DIPE), methyl tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), <br />' tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dichloroethane <br /> (1,2-DCA), and 1,2-dibromoethane (EDB) in accordance with EPA Method 8260B <br /> • Sampling equipment was washed in an Alconox solution and rinsed with water prior to each <br /> sampling run to minimize cross-contamination <br /> 212 Logging <br /> r <br /> " Soil was extruded from a remaining brass sleeve and visually described in accordance with,the - n <br /> Unified Soil Classification System (USCS, see Appendix B for boring logs) <br /> 21 3 Well Completions <br /> l ' 4 <br /> Pilot borings MW-4 through MW-6 were completed as ground water monitoring wells of the same <br /> designations using 2-inch diameter polyvinylchloride(PVC)casing witlia 0 010-inch slotted screen <br />' installed from 15 feet to 35 feet bsg The,filter pack(No 3 Lonestar sand)was installed from 13 feet <br /> to 35 feet bsg, and a nominal 2-foot bentonite chip plug was installed above the filter pack and <br /> hydrated The remaining annular space was filled to near surface grade with portland cement and <br /> water-tight, traffic-rated well boxes were installed over the wells As-built well diagrams are s <br /> depicted on the boring logs in Appendix B' <br /> I r <br /> i <br />' Advanced GeoEnvironmental,Inc <br /> I ' <br /> l <br />