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i 922 moisture dropouts and the "Cyclo-Purge" for carbon rejuvenation. After the vapor stream leaves the second moisture dropout (or �r exhC clo-Purge"} it flows into the carbon scrubs and then is austed to atmosphere (at least two carbon scrubs series at a time) During the initial starts up, sat HNu E photoionizing detector (PID) was used to determine if break F through was occurring on the #1 carbon along with occasional i tedlar bag sample analyzed in WEGE's laboratory using GC-FID (4/26/91-6/5/91) • If breakthrough was occuring through the Imo= carbon, this carbon is removed from the system, j the #2 carbon is then placed into the 91 Position Placed on the exhaust as the #2 carbon. Starting nwithnthacasre ` € i visit on 6/7/91, a portable ambient air PID-GC (Photovac 10,50 Packed column) was used at the site to sample for bkthrough and ! rea the influent from the various vapor extraction wells, see Table 3. CHROTfOI,OGY OF VACL-[IM EXTRACTION APRIL 26, 1991 l ; Under. Interim Variance Decision No. 91-19 A extraction Gammenced at 3:30 m (Appendix A) , . _vapor day. As shown on figureP and'was terminated at 8:30 that $ unit was placed after the blower panddinfronix t1of91the 8ondgallon.. ..Y� activated vapor carbon tub scrubs. I 11 Purge", see Appendix D, condenses out rthecwatersate vapornit and asymuch of the gasoline vapor as poss4.ble prior to the vapor stream entering the carbon, thus reducing the of streamla entering the carbon scrubs and allowingthescrubs to last longer. Initial vapor stream readings taken of the influent . and effluent were performed using a HNu hand held (PTD) ti with a 10.2 electron volt isobutylene/air as 54 ppm benzene inlaircalibrated with 100 pom At 8:00 pm- the "Cyclo-Purge'l cooling coils iced up at a . temperature of 420F. It was determined at,the time, that:- the icing was probably attributed.to benzene in the. vapor benzene has a freezing point of stream, 41.g�F'. The system was then shut 'I down for the night to defrost 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 exerted on the formation. made and These codifications were the system was restarted on. May 10, 1991 at l:oo Readings were obtained at the influent of the first carbon using a hand held PID, at the exhaust of the first_ carbon--and at -the------, manifold---prior to-the-'!Cyclo Purge" -.- T ---- - - - -- "CYcxo Puirge' showed a reading Of400 ppm as benzene, thenfluent exhaustof the �'Cycio Purge" reading g {influent of the first carbon} showed a g of 250 ppm at 1300? and the exhaust of the first carbon page 8 - t r f i