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' 29 January 2001 • AGE-NC Project No. 98-0450 ' Page 2 of 6 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 water 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, • Volatile aromatics - benzene,toluene, ethyl benzene and xylene (BTEX) with methyl tert- butyl ether (MTBE) in accordance with EPA method 8020, • Fuel additives [MTBE, di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl ' methyl ether (TAME) and tertiary butanol (TBA), ethylene dibromide, 1,2-dichloroethane (1,2-DCA), ethanol and methanol] in accordance with EPA method 8260 Modified. 2.3. SOIL-VAPOR EXTRACTION ' The SVE system was maintained and monitored monthly, or during restart procedures. During each monitoring event, the flow rate of extracted soil-vapor(influent) was measured using an electrical ' DPT 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-vapor stream was measured before entering the blower (influent 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). Two gets of soil-vapor samples were collected during the period of operation(fourth quarter 2000).• Sarenpies Were collected'on 20'0ctober and 27November'2000; 1n-Tedlar vapor'bags using a vacuum pump attached to the influent and effluent stream. The samples were labeled,placed in a pre-chilled 1 cooler and transported under chain-of custody to MAI. The samples were analyzed for: • TPH-g in accordance with EPA Method 8015 Modified and ' Advanced CeoEnvironmental,Inc.