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1.. 20 October 2004 AGE-NC Project No. 04-1156 Page 4of6 3.3. GRAB GROUND WATER COLLECTION Ground water was encountered at a depth of approximately 33 feet bsg in each boring; a grab ground water sample was collected utilizing a disposable plastic bailer.The sample was collected into three EPA-approved 40-m1 volatile organic analysis(VOA)vials containing 0.5 ml 18%hydrochloric acid as a sample preservative. The collected ground water samples were labeled with the boring designation, date, time, and sampler's initials and placed in a chilled container under ice. 3.4. LABORATORY ANALYSIS OF SOIL AND GRAB GROUND WATER SAMPLES The grab ground water and soil samples were transported under chain of custody procedures to Cal Tech Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified laboratory, and analyzed for: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015M; • Benzene, toluene, ethylbenzene and xylenes (BTEX) in accordance with EPA Method 826013; and • The fuel additives methyl tertiary-butyl ether (MTBE), di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B. 3.5. EQUIPMENT DECONTAMINATION All augers used were cleaned prior to advancement in each soil boring location. The sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to avoid cross-contamination. 3.6. BOREHOLE ABANDONMENT At the conclusion of soil boring activities, the borings were permanently sealed to prevent vertical migration of contaminants. Under EHD oversight, the borehole was backfilled with cement slurry from the total depth to surface grade. Advanced GmEnvironmentai,Inc.