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. <br /> Irt� �►, irNC. SACRAMENTO <br /> REVIEW KRAFT <br /> Addendum Letter to Mr. Harlan Knoll <br /> August 31, 1990 <br /> Page 5 <br /> extremely reliable. Figure 6, Attachment I shows a soil vapor extraction <br /> flow diagram. <br /> Air Emission Controls <br /> The expected duration of the pilot program is approximately 120 <br /> days. Therefore the system will need to meet the air emission <br /> requirements of the San Joaquin Air Pollution Control District (APCD) . <br /> According to Mr. Jorge DeGusman, Assistant Engineer, APCD, the district <br /> follows the guideline of the South Coast Air Quality Management District. <br /> The actual permit procedure and requirements are as follows: <br /> 1) A permit application must be submitted with a $50.00 filing fee. <br /> The actual cost will be $50.00 or $50.00 per hour whichever is <br /> greater. <br /> 2) The emission controls must be able to reduce pretreatment levels of <br /> TPH by 90% or more. <br /> 3) The method used to control emissions must follow the best available <br /> control technology (BACT) . Either activated carbon or catalytic <br /> oxidation meet this requirement. <br /> Activated carbon absorption bonds hydrocarbon contaminants <br /> directly onto receptor sites on the carbon and thereby removing them <br /> from the vapor stream. This method is most economical for low emission <br /> rates on the order of 100 grams per day of contaminants. <br /> Catalytic oxidation involves the passing of the vapor stream over <br /> a heated bed of catalyst elements. This method of emission control is <br /> suitable for contaminants on the order of 8,000 ppm or less. The method <br /> is up to 95% effective in removing contaminants. As a secondary <br /> feature, the heated vapors may be reinjected back into contaminated soil <br /> thereby raising the soil temperature. This can substantially increase <br /> the recovery of low or non-volatile compounds. <br /> Both methodology's are being examined for this pilot study. <br /> However, it is anticipated that catalytic oxidation will be the method <br /> of choice should a full scale program be implemented. This will allow <br /> for reinjection of the heated air stream and improve hydrocarbon <br /> recovery. <br /> Laboratory Analysis „of Samples <br />. The analysis of up to 15 soil samples will be performed by a mobile <br /> laboratory positioned on site. This will allow the reporting of <br />