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moisture dropouts and the "Cyclo-Purge" for carbon rejuvenation. After the vapor stream leaves the second moisture dropout (or "Cyclo-Purge" ) it flows into the carbon scrubs and then is t exhausted to atmosphere (at least two carbon scrubs are set in series at a time) . During the initial start up, a HNu photoionizing detector (PID) was used to determine if break _ z -through was occurring on the #1 carbon along with occasional tedlar bag sample analyzed in WE+GE's laboratory using GC-FID (4/26/91-6/5/91) . If breakthrough was found to be occuring through the 1-t carbon, this carbon is removed from the system, the #2 carbon is then placed into the #1 position and a new carbon placed on the exhaust as the #2 carbon. starting with the site visit on 6/7/91 , a portable ambient air PID-GC (Photovac lOS50 packed column) was used at the site to sample for breakthrough and the influent from the various vapor extraction wells, see Table 3. CHRONOLOGY OF VACUUM EXTRACTION APRIL 26, 1991 U 1 variance Decision► o. 91-19 { a�i � � ��u�w ( dia� - - p�v� or 191y, �K �^`ON _" a �s a�'�` ran Fir v!.'" dre Po r y _• ", shown on fSB� (hAppen�3x A=4%1 /91} a condensate unit was placed after the blower and infront of the 85 gallon tactivated vapor carbon tub scrubs. The condensate unit "Cyclo- Fsrge" , see Appendix D, condenses out the water vapor and as much of the gasoline vapor as possible prior to the vapor stream entering the carbon, thus reducing the poundage of the vapor stream entering the carbon scrubs and allowing the carbons scrubs to last longer. Initial vapor stream readings taken of the influent and effluent were performed using a HNu hand held (PID) with a 10.2 electron volt (ev) bulb calibrated with 100 ppm isobutylene/air as 54 ppm benzene in air. "t s - IC cola! rge" dh, 15 nis x ed, up`v-z 4ktN*4ta,, w down„, for the night -to de ros the cooling coils. It was then determined that better adjustments were needed for the cooling system and that a larger blower was needed to increased the flow and vacuum e�ryt on thepformation. �` }{� moc �tat cng� iaere Readings were obtained at the influent o� �he first carbon using a hand held PID, at the exhaust of the first carbon and at the k manifold prior to the "Cyclo Purge” unit. The influent into the "Cyclo Purge' showed a reading of 400 ppm as benzene, the exhaust of the "Cyclo Purge" (influent of the first carbon) showed a reading of 250 ppm at 130OF and the exhaust of the first carbon - page 8