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, r <br /> Ad efts lk� ®C ACFi MENTO <br /> Mr. arlan RnoIAZ <br /> November 19, 1990 <br /> Page 6 <br /> Catalytic oxidation involves the passing of the vapor stream <br /> over a heated bed of catalyst elements. This method of emission <br /> control is suitable for contaminants on the order of 8,000 ppm or <br /> less. The method is up to 95$ effective in removing <br /> contaminants. As a secondary feature, the heated vapors may be <br /> reinjected back into contaminated soil thereby raising the soil <br /> temperature. This can substantially increase the recovery of low <br /> volatility compounds. <br /> Both methods are being examined for this pilot study. <br /> However, it is anticipated that catalytic oxidation will be the <br /> method of choice should a full scale program be implemented. <br /> This will allow for reinjection of the heated air stream and <br /> improve hydrocarbon recovery. <br /> Laboratory Analysis of Samples <br /> The analysis of up to 15 soil samples will be performed by a <br /> mobile laboratory positioned on site. This will allow the <br /> ;E•, reporting of analytical data in sufficient time to be used during <br /> the construction of the vapor extraction wells. The laboratory <br /> will be California Department of HC-,:lth Services (DHS) certified. <br /> Each soil sample selected for analyses will be analyzed for TPH-d <br /> by DHS Methodology and for benzene, toluene, ethylbenzene and <br /> xylenes by modified EPA Method 8020. Samplers for bacteria <br /> population count will be analyzed by a laboratory not yet <br /> selected. <br /> Up to 20 vapor samples will be collected during the <br /> operation of the pilot study. All of the samples will be <br /> submitted under',chain of custody to Trace Analysis Laboratory in <br /> Hayward, California. Each sample will be analyzed for TPH-d, <br /> benzene, toluene, ethylbenzene and xylenes by modified EPA Method ,, <br /> 8020 by Trace Analysis Laboratory Method. <br /> schedule f clot Study <br /> It is anticipated that the wells will be installed by <br /> January 1, 1991. By January 14, 1991, the SVX system should be <br /> ready for operation. The pilot study is expected to run <br /> approximately 120 days and will be completed on or about May 14, <br /> 1991. A report of the pilot study's findings will be completed <br /> within 45 ,days of the study's completion. Included in the pilot <br /> study report will be an evaluation of what residual levels of <br /> contamination will remain after completion of a full scale <br />