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i ipurging was terminated After purging, groundwater samples were collected with disposable, factory-cleaned polyethylene bailers EA field personnel rinsed the bailers three times with i deionized water prior to collecting a groundwater sample The water was placed in 40-m1 VOA vials Vials were labeled and preserved in an ice-filled cooler for storage and transported under appropriate chain-of-custody procedures Samples of groundwater, a rinse iblank, and a field trip blank were sent to Pace Incorporated and analyzed for Total Petroleum Hydrocarbons as gasohne (TPH-g) by DHS-modified EPA Method 8015 and for benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method 8020 i The analytical results for the samples collected on 2 August are resented in boldface in Yt P g P type i Table 1, along with results of previous analyses The laboratory analytical report is included as Appendix B i Detectable concentrations of petroleum hydrocarbons ranged from 620 pg/L (MW 13) to 160,000 µg/L (V2) for TPH-g, and from 1 3 pg/L (MW13) to 21,000 pgfL (V2) for benzene The concentration of TPH-g in the sample collected from MW8, located adjacent to the Shell i service station and upgradient of the site, was 28,000 pg/L Historical trends indicate a gradual decrease in TPH-g concentrations in all wells except MW9 and MW 13, which have increased in TPH-g concentration A liquid-phase hydrocarbon layer, 0 02 inches thick, was idetected in V4 The soil vapor extraction system and air sparging systems operated throughout the quarter Influent and effluent concentrations from monthly self-monitoring are shown in Table 2 i3. WORK PROPOSED FOR NEXT QUARTER Water elevations in groundwater monitoring wells will be measured and groundwater samples i collected in November 1994 The samples will be analyzed for petroleum hydrocarbons The soil vapor extraction and air sparging system will continue to be operated and its progress monitored i i i i I ' 73942Q894 1 2