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' polyethylene bailers which had been cleaned at the factory EA field personnel rinsed the <br /> bailers three tunes with deionized water prior to collecting a groundwater sample The water <br /> was placed in 40-m1 VOA vials Vials were labeled and preserved in an ice-filled cooler for <br /> storage and transported under appropnate chain-of-custody procedures Samples of <br /> groundwater, a rinse blank, and a field trip blank were sent to Pace Incorporated and analyzed <br />' for Total Petroleum Hydrocarbons as gasoline (TPH-g) by DHS-modified EPA Method 8015 <br /> and for benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method 8020 <br /> IThe analytical results for the samples collected on 10 May are presented in boldface type in <br /> Table 1 with results of previous analyses The laboratory analytical report is included as <br />' Appendix B <br /> TPH-g concentrations ranged from 110 gg/L to 220,000 gg/L, and benzene vaned from <br /> 1 I gg/L to 24,000 gg/L The lower concentrations were found in MW 13, the off-site <br /> downgradient well. The higher concentrations were found in V2, located in the northeast <br /> corner of the site The concentration of TPH-g in the sample collected from MW8, located <br /> adjacent to the Shell service station and upgradient of the site, was 49,000 pg/L Historical <br /> trends indicate a general decrease in TPH-g concentrations in all wells except MW 13, which <br /> increased in TPH-g concentration. A liquid-phase hydrocarbon layer, 0 02 inches thick, was <br /> detected in V4 for the first time since October 1992 <br /> 3. WORK PROPOSED FOR NEXT QUARTER <br /> Water elevations in groundwater monitoring wells will be measured and groundwater samples <br /> collected in August 1994 The samples will be analyzed for petroleum hydrocarbons <br /> The soil vapor extraction and air sparging system will be placed on routine operations <br /> monitoring <br /> I <br /> I <br /> I <br />' 73942Q594 2 2 <br />