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1 ? I n 1 hl 7 1 29 December 1999 AGE-NC Project No 97-0312 Page 4 of 9 1 1 ' sample preservative and into 1-liter amber bottles without preservative The samples were labeled, placed in a chilled container and transported under chain-of-custody to McCampbell Analytical Inc (MAI)in Pacheco, a California Department of Health Services(DHS)-certified analytical laboratory, r and were'analyzed for '� 1 ■ • Total petroleum hydrocarbons quantified, as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Methods 5030 and 8015m, • Volatile aromatic hydrocarbons (benzene, toluene, ethylbenzene and total xylenes, BTEX) with methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020/602, and 0 Fuel oxygenates (MTBE, di-isopropyl ether [PIPE], ethyl tert-butyl ether [ETBE], tert-amyl methyl ether [TAME] and tert-butanol [TBA]) in accordance with EPA Method 8260 1 modified S I3 3 DRILLING AND SAMPLING From 27 to 29 September 1999, 12 soil borings were advanced at the site Bonngs B18 through B29 were advanced to vertical depths between 30 and 70 feet below surface grade (bsg) Borings B18 through B28 were advanced using a CME-75HT drill ng equipped with 63/4-inch diameter hollow- stem augers Boring B29 was advanced using a hand auger The dell ng and three-man crew were supplied by Machell Drilling Environmental Corp (MDE) of Rancho Cordova, California Auger returns generated by drilling were stockpiled on-site approximately 300 feet northwest of the former USTs location Boring locations are'shown on Figure 2 ` Samples collected from bonngs B 18 through B28 were collected ahead of the drill bit using a split- tube sampler loaded with three pre-cleaned 2-inch by 6-inch brass sleeves Samples were collected , ' at five-foot intervals, beginning at depths of 10 feet bsg in boring B23, beginning at a depth of 15 feet bsg in borings B25 and B28, and beginning at a depth of 5 feet bsg in the remaining borings, using a 140-pound hammer to advance the sampler 18 inches The number of blows,required to advance the sampler in 6-mch increments was recorded on the boring logs Soil samples were collected froln boring B29 at five-foot intervals using,a metric soil sampler loaded withlwo 2-mch by 3-inch brass sleeves , All sampling tools and sample liners used for sample collection were4horoughly rinsed with clean i water after washing with a solution of Alconox between each sampling run to avoid cross- contamination For each sample, both ends of the leading sleeve were covered with Teflon sheets, capped and sealed with tape The samples were labeled, stored on ice and transported under chain-of- custody to MAI for analyses Advanced GeoEnvironmental,Inc 4 1 M r