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1 14 December 2000 • AGE-NC Project No 99-0559 ' Page 3 of I 1 ' hammer to drive soil and ground water sampling tools to specified depths On 14 to 17 December 1999,AGE advanced four soil probe borings at the site Probe bonng B 1 was ' advanced in the area of the behind the current store location south of the UST locations to a total depth of 52 feet below surface grade (bsg) Probe boring B2 was advanced in the area between the current USTs to a total depth of 45 feet bsg A third probe boring, B3, was advanced northeast of the ' UST area to a total depth of approximately 62 feet bsg Probe bonng B4 was advanced approximately 10 feet north of former UST area to a total depth of 50 feet bsg Samples were collected at five-foot intervals in each probe boring ' 3 1 1 Soil And Grab Water Sample Collection Discrete soil samples were collected using the Geoprobe push-driven 2-inch diameter soil sampler fitted with four six-inch long brass sleeves at 5-foot intervals beginning at 5 feet bsg in all soil borings 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 Soil encountered in the borings was visually classified by an AGE geologist in accordance with the Unified Soil Classification System (USCS) Selected soil samples were logged on a chain-of- custody, transported to Alpha Analytical Laboratory (AAL) in Ukiah, a State of California Department of Health Services (DHS)-certified laboratory, and were analyzed for I0 Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015M, a Volatile aromatics benzene, toluene, ethylbenzene and xylene (BTEX)with methyl tertiary- butyl ether(MTBE) in accordance with EPA Method 8020, and I0 Fuel additives, including tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE) and tert-amyl methyl ether (TAME) and MTBE in accordance with EPA Method 8260M Grab ground water samples were collected from probe borings B3 and B4 The samples were I 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 samples were extracted by lowering a Teflon hose equipped with a ball-valve through the hollow center of the push rods into the screen. Isection Upon retrieval, each sample was transferred into EPA-approved 40-m1 volatile organic . analysis (VOA) vials, containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was I taken to ensure that visible air bubbles were not present in the VOA vials after filling and capping 9 1