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t12 February 2002 AGE-NC Project No. 98-0450 ' Page 2 of 6 ' An ICM Model 52200 water analyzers were utilized to monitor temperature, pH and conductivity of purged water at regular purge-volume intervals. Stabilization data and field logs are included in Appendix A. Purged ground water was containerized in 55-gallon drums and stored on-site. 1 - 2.2. GROUND WATER SAMPLE COLLECTION ' The ground water levels in all six wells were allowed to recharged to a minimum of 80% of the initial well volume prior to sample collection. Ground water samples were collected from each well ' using new disposable plastic bailers. Each wager sample was then transferred into a one-liter amber bottle and into three 40-m1 volatile organic analysis (VOA) vials containing 0.5 ml 18% HCl as a sample preservative. The samples were then labeled and placed in a chilled container for transport ' under chain-of-custody to McCampbell Analytical, Inc. (MAI) of Pacheco, California, a State of California- Department of Health Service (DHS)-certified laboratory. The samples were analyzed for the following: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and total petroleum ' hydrocarbons quantified as diesel(TPH-d)in accordance with EPA Method 8015 Modified for gasoline and diesel, respectively, • Benzene,toluene,ethyl benzene and xylene(BTEX) and methyl tert-butyl ether(MTBE)in ' accordance with EPA Method 8020, • Fuel additives-di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary- butyl ether (MTBE), tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA) in accordance with EPA Method 8260 Modified, respectively. I 2.3. SOIL-VAPOR EXTRACTION ' The SVE system was maintained and monitored monthly and during restart procedures.During each monitoring event,the flow rate of extracted soil-gas(influent)was measured using an electrical DPT 1 flow meter. Vacuum potential was measured at the two and one-half inch influent line using a magnehelic vacuum gauge. The organic-vapor concentration in the extracted soil-gas stream was measured prior to entering the blower(influenf stream) and after exiting the catalytic unit{effluent stream)using an organic vapor` meter (OVM) equipped with a photo-ionization detector: PID (Thermo Environmental 580A, ' 10.0eV, calibrated to isobutylene 100 ppb). • Five sets of soil-vapor samples were collected during the last five months 2001. The samples were ' collected in Tedlar vapor bags using a vacuum pump attached to the influent and effluent stream Advanced GeoEnvironmental,Inc.