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• 09 September 2002 ' 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. Subsequently,groundwater samples were collected from each well using a new disposable plastic bailer. Each water sample was then transferred into three 40-m1 volatile organic analysis (VOA) vials containing 0.5 ml 18%HCl as a sample preservative and a one- liter amber bottle without 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: tTotal 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, ' The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl etherl,ETBE meth ( } y tertiary-butyl ether(MTBE),tertiary-amyl methyl ether(TAME) and tertiary butanol(TBA) ' in accordance with EPA Method 8260 Modified, respectively. 2.3. SOIL-VAPOR EXTRACTION ' On 22 February 2002, the soil vapor extraction pump motor on the electric catalytic oxidizer failed; the SVE unit was removed for service. Because progressively lower concentrations of volatile hydrocarbons have been extracted from the SVE and air-sparging system while electrical costs have remained high, currently beyond the cost effective remediation goals for the site, AGE proposed to continue to extract hydrocarbons utilizing an active vacuum blower, which was installed at the site on 19 March 2002. The vacuum blower was monitored o ed monthly. The flow rate of extracted soil-gas (influent) was measured using direct measure flow meter, and vacuum potential was measured at the two-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 using an organic vapor meter (OVM) equipped with a photo-ionization detector: PTD (Thermo Environmental 580A, 10-OeV, calibrated to isobutylene 100 parts per billion). ' Three sets of soil-vapor samples were collected during the second quarter of 2002. The samples were collected in Tedlar vapor bags using a vacuum pump attached to the influent and effluent stream ' Advanced GeoEnvironmental,Inc.