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' '05 January 2004 i AGE-NC Project No. 95-0137 Page 2 of 8 vapor stream was measured before entering the blower(influent stream)using an organic vapor meter ' (OVM) equipped with a photo-ionization.detector: PID (Thermo Environmental 580B, 10.OeV, calibrated to isobutylene 100 parts per million: ppm). Field measurements recorded at regular intervals between late September and December are summarized in Table 1. Soil-vapor samples were collected to document trends in concentrations of hydrocarbons in the soil vapor extracted by the S VE network and document hydrocarbon mass removal. Soil-vapor samples ' from the influent stream were collected in Tedlar vapor bags on 27 October, 19 November and 02 December 2003 using a vacuum pump attached to the influent stream.The samples were labeled, placed in a pre-chilled cooler and transported under chain-of-custodyto McCampbell Analytical Inc. '. (MAI)a California Department of Health Services(DHS)-certified laboratory in Pacheco,California,. The samples were analyzed for:, , • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified; and f . • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ethero�� '. (MTBE) in accordance with EPA Method 8020. rA 2.2. WELL MONITORING PROCEDURES ' Quarterly ground water monitoring activities were conducted on 04 November 2003. Monitoring wells MW-1 to MW=5 were monitored and sampled. 2.2.1. Well Monitoring and Evacuation ' A Solinst water level meter was used to measure the depth to ground water in on-site wells MW-i through MW-5 relative to the tops of the well casings. The ground water elevations and gradient ' were determined from these data (Table}. After recording water level measurements,disposable plastic bailers were used to purge the wells of ' 'standing water. Approximately 1.5 to 4.25 gallons of water(a minimum of 3 casing water-volumes per well) were removed from MW-1 through MW-5; well MW-2 was purged dry after 1.5 gallons of water were removed. ' t regular interval Ground water temperature, pH and conductivity were measured a g s during purging using an Oakton water analyzer. Purged ground water was containerized in properly labeled ' Department of Transportation(DOT)-approved model 17H 5 5-gallon drums and was stored on-site. . Field sheets and data are included in Appendix A. ' Advanced CeoEnvironmental,Inc. '