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' 01 March 2000 AGE-NC Project No 99-1828 Page 4 of 8 3 1 ADVANCEMENT OF SOIL PROBE BORINGS Soil probe borings were advanced using AGE's van-mounted Geoprobe 5400 direct-push probing ' unit equipped with 1 25-inch probing rods The Geoprobe advances soil probe borings using a s hydraulic or pneumatic hammer to drive soil and ground water sampling tools to specified depths The location of the soil probe borings are depicted on Figure 4 1 On 29 October 1999 and 01 November 1999, AGE advanced eight soil probe borings at the site Probe borings B-1 and B-2 were advanced near the west ends of the former northern and central ' dispenser island locations Probe boring B-3 was advanced north of the former dispenser island locations and dust south of the store location The fourth boring, B-4 was advanced west of the former UST location and B-5 was advanced south of the former UST location Probe borings B-6, ' B-7, and B-8 were advanced east of the three former dispenser islands locations All eight probe borings were advanced to a depth of 30 feet bsg Samples were collected at five-foot intervals in each probe boring lie 1 32 SOIL AND GRAB GROUNDWATER SAMPLE COLLECTION Discrete soil samples were collected using the Geoprobepush-driven 2-inch diameter sampler fitted ' with four six-inch long brass sleeves at 5-foot intervals, beginning at 5 feet bsg from all soil borings, except B-5, in which soil sample collection began at 15 feet bsg Soil samples were preserved by covering both ends of the second brass sleeve with Teflon sheets, capping and sealing with tape Each preserved sample sleeve was labeled with soil boring location,depth,time, date and sampler's ' initials and was stored in a chilled container under ice ' Additionally, soil samples were field screened for the presence of volatile organic compounds using an organic vapor meter (OVM) Selected soil samples were logged on a chain-of-custody form, transported to a State of California Department of Health Services (DHS)-certified laboratory, and ' were analyzed for • TPH-g and TPH-d in accordance with EPA Method 8015 Modified, tBTEX and MTBE in accordance with EPA Method 8020 and • TBA, DIPE, ETBE, MTBE and TAME in accordance with EPA Method 8260 Modified 1 Grab groundwater samples were collected from probe borings B1, B3, B4, B6, B7 and B8 Samples ' were collected utilizing a Geoprobe water sampling assembly fitted with a pre-cleaned one-inch • diameter, 0 01 slotted temporary well screen Each ground water sample was extracted by lowering a Teflon bailer through the hollow center of the push rods into the screen section Upon retrieval, ' Advanced GeoEnvironmcntal,Inc 1