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I29 December 2000 AGE-NC Project No 96-0235 Page 2 of 8 1 II 1 1 S ' 2 2 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each purged well using new disposable plastic bailers Each water sample was transferred into 40-m1 VOA vials containing 0 5,ml 18% hydrochloric acid as a sample preservative and into 1-liter amber bottles without preservative After collection, the samples were properly labeled, placed in a chilled container and transported under chain-of-custody to IMcCampbell Analytical, Inc (MAI), a State of California Department of Health Services (DHS)- certified analytical laboratory, and were analyzed for Total petroleum hydrocarbons quantified as gasoline (TPH-g) and as diesel (TPH-d) in accordance with EPA Methods 5030 and 8015m, e • Volatile aromatic hydrocarbons - benzene, toluene, ethylbenzene and total xylenes (BTEX) with methyl tertiary-butyl ether(MTBE) In accordance with EPA Method 60218020, and for Fuel oxygenates - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA) in accordance with EPA Method 8260 Modified 1 • I23 DRILLING AND SAMPLING On 25, 26 and 27 July 2000, nine soil borings (MW-11A and B, MW-12A and B, MW13A and B, f EW-1, EW-2 and AS-1)were advanced at the site using a CME 75 HT drill rig, equipped with 8 25- inch diameter hollow-stem augers (MW-11A through MW-13B and AS-1) and 10-inch diameter hollow-stem augers (EW-1 and EW-2) The drill rig and two-man crew were supplied by Mitchell Drilling Environmental of Rancho Cordova Auger returns generated by drilling were stored on-site on plastic sheeting, pending laboratory analysis .r Soil samples'from borings were collected ahead of the drill bit using a California modified spirt- spoon sampler loaded with three pre-cleaned 2-inch by 6-inch brass sleeves Samples were collected -° -at five-foot-intervals, beginning at 20 feet bsg using a 140-pound hammer to advance the sampler - The number of blows required to advance the split-spoon sampler over each 6-inch increment of the 18-inch sampling interval was recorded on the boring logs Sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to avoid cross-contarnmation { Soil samples were preserved by covering both ends of the leading or other selected sleeve with Teflon sheets, capping with plastic and sealing with tape The samples were labeled, stored on ice and transported under chain-of custody to MAI I Advanced GeoEnvtronmental,Inc