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,r 05 May 2004 AGE-NC Project No. 01-0886 Page 3 of 6 3.1. SOIL BORING ACTIVITIES r. Probe borings B-1 through B-3 were advanced utilizing a truck-mounted Geoprobe 5400 equipped with 1.125-inch diameterprobe rods using"direct push"technology.Probe boring B-1 was advanced vertically to a depth of 70 feet below surface grade(bsg)in the center of the former UST excavation, B-2 and B-3 were advanced vertically to a depth of 75 feet bsg south and north of the former UST excavation, respectively, to obtain soil and grab ground water samples. av 3.1.1. Soil Sample Collection +V Soil samples were collected at 5-foot intervals, beginning at 10 feet bsg, to total depth of each boring.Each sample was collected utilizing a 1.125" Geoprobe soil sampling assembly loaded with '- four six-inch brass sleeves. After collection,the ends of the second brass sleeve were covered with Teflon sheets,capped and sealed with tape. Each sample sleeve was labeled with soil probe boring location, depth, time, date and sampler's initials and then placed in a chilled container. 3.1.2. Ground Water Sample Collection Grab ground water samples were collected from probe borings B-1 through B-3. Grab ground water samples were collected utilizing a Geoprobe water sampling assembly fitted with a pre-cleaned one- inch diameter 0.01-inch slotted temporary well screen. The ground water sample was extracted by lowering a Teflon hose equipped with a ball-valve through the hollow center of the push rods into the screen section. Each ground water sample was transferred into three laboratory-supplied,40-m1 volatile organic analysis (VOA) vials containing 0.5 ml hydrochloric acid (18%) as sample L/4, 6� preservative and one laboratory-supplied 1 liter amber bottle without a e err collection,the Sf I samples were properly labeled,placed in a chilled container and transported under chain-of-custody to Cal Tech Environmental Laboratories(CTEL)a California Department of Health Services(DHS)- certified laboratory. Lo 3.1.3. Equipment Decontamination L. Prior to sample collection, Geoprobe soil sampling equipment was thoroughly rinsed with clean water after being washed with a solution of Alconox. Geoprobe rods were thoroughly cleaned prior to soil probe boring advancement. La V+ Advanced GeoEnvironmental,Inc.