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f f <br /> a <br /> 8:\CYLOPURG.DOC <br /> 0,41 <br /> Mr. John Margowski May 24, 2992 <br /> Wickland Properties <br /> f <br /> 1765 Challenge Way <br /> Sacramento, CA. 95814 <br /> (916) 921-1100 <br /> FAS (916) 921-3510 <br /> - -_- RE: Limited evaluation of removal efficiency of aged petroleum- <br /> hydrocarbons from vapor extraction vapor stream using the Cylco <br /> Purge condenser at former Regal Station 604, 1448 N. El Dorado <br /> Street, Stockton, CA. <br /> Dear Mr. Margowski: <br /> Site visits were conducted in the afternoon on the following days; <br /> May 20, 21 and 22, 1991, and samples were obtained of the effluent <br /> of the charcoal, the effluent and the influent of the Cyclo Purge. <br /> These samples were brought back to the WEGE lab and analyzed for <br /> total fuel hydrocarbons, benzene, toluene, ethylbenzene and r , <br /> xylenes (TFH-BTEX) . During these visits vacuum readings were <br /> obtained at the extraction wells, pressure readings were obtained <br /> at the injection wells and samples were obtained from the the <br /> extraction wells. Also flow rates were determined from <br /> measurements obtained at the orifices at the extraction manifold, <br /> please see enclosed Table 1. <br /> Observations made of the functioning of the Cylco Purge are as <br /> follows: <br /> May 20, 1991 - PM <br /> 1 . The Cyclo Purge was in operation with approximately 2 <br /> oz. of fluid collected in the 5 gallon bucket with the <br /> pump DR 646 pulling a vacuum through the condensate <br /> tank. <br /> 2. The Cyclo Purge was operating o <br /> y g p ng at a temperature of 54 F. <br /> 3. PID readings between the two connected charcoal drums <br /> was 300 ppm vapor, indicating breakthrough. <br /> r F <br /> 4. PID readings at the exhaust of the second charcoal drum <br /> was 200 ppm vapor, indicating breakthrough was oecuring. <br /> f <br /> { 5. Hydrocarbon odor was emitting at the injection well <br /> heads. <br /> 6. The U-tube connected to the condensate tank showed to <br /> high of a vacuum was being generated, fluid completely <br /> filled U-tube, approximately 12" higher than U-tube <br /> drain. <br />