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Working To Restore Nature <br /> Report on Vapor Extraction Test January 29, 1993 <br /> Coca-Cola Former Distribution Facility, Stockton, California 5400601 <br /> date, if necessary The necessity for groundwater treatment will be re-assessed after soil <br /> vapor extraction is completed and after one year of additional quarterly monitoring, <br />' following VES shutdown <br /> _Off-Gas Abatement_Technolo2y <br />' The San Joaquin Valley Unified Air Pollution Control District will typically approve four <br /> alternatives to control off-gas emissions 1) activated carbon filtration, 2) IC engine, 3) <br /> catalytic oxidation, and 4) thermal oxidation Carbon is feasible and most cost-effective at <br /> low concentrations and/or low flows (low mass extraction rates), an IC engine is capable <br /> of cost-effectively treating low flows (generally less than 150 cfm) and high concentrations, <br /> 1 catalytic oxidation is most cost-effective for moderately high flows and low to moderate <br /> concentrations, and thermal oxidation is most cost-effective for high flows and high <br /> concentrations <br />' The recommended design flows for this site are an average 75 cfm per well at a vacuum of <br /> about 60-inches of water column This is a total well flow of 225 cfm for the three wells <br /> VEW-2, VEW-3, and VEW-7 The concentrations and flows for this site make the use of <br /> catalytic oxidation or thermal oxidation the most cost-effective off-gas abatement devices for <br /> this site during startup After initial high concentrations have been abated to extraction <br /> rates of about 2 lb/day, activated carbon then becomes safe and cost-effective Since Coca- <br /> Cola has already purchased a thermal oxidizer for this site, it is recommended that thermal <br /> oxidation be used as the off-gas abatement technolog} for this site The estimated duration <br />' of operation of the vapor extraction system is about 12 to 15 months, and is based on the <br /> total pounds of petroleum hydrocarbons in the soil, the average concentration of TPHg that <br /> was removed during the vapor extraction test, and on the type of soil encountered at the <br /> site The thermal oxidizer can be used for the entire projected 12 to 15 month operation <br /> time, or after about 4 to 6 months the thermal oxidizer can be taken to another Coca-Cola <br /> site and activated carbon can be brought on line The vapor extraction system will be <br /> operated until extracted gas concentration are consistently nondetectable for an approved <br /> period of time <br /> 1 <br />' 16 <br />