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REMEDIAL ACTION PLAN USA STATION#65 - LODI NOVEMBER, 1995 To maintain an operating temperature of 600 to 800 degrees Fahrenheit, electric heating coils are used in the combustion chamber. Manufacturer's specifications indicate that at 250 CFM, the unit will treat approximately 200-pounds per day when operated with a TPH influent vapor concentration of approximately 2,500 ppm v/v. L. The vapor extraction unit is equipped with safety devices to ensure safe operation of the equipment and safe conditions for the public. The unit is "fail safe" in that the unit shuts off and no vapors containing petroleum hydrocarbons are released if any malfunction occurs. In the event LM that soil vapors have an increase in petroleum hydrocarbon concentrations, the unit automatically compensates by opening a dilution valve, which reduces vapor concentrations by allowing ambient air to mix with the soil vapors. In the event of malfunction of the catalytic oxidizer, the unit will shut off electricity to the vapor extraction pump and combustion chamber. Under no circumstances will untreated soil vapors be vented to the atmosphere. The treated vapors exiting the catalytic oxidizer will be monitored as per SJVUAPCD requirements to assure public safety L. from exposure or explosion. 7.4 Vapor Extraction System Operation and Maintenance The vapor extraction/catalytic oxidation system will be operated as specified by the manufacturer. �... The performance of the proposed treatment system will be monitored as per SJVUAPCD requirements for the first week of operation to ensure satisfactory system performance. Site visits will be made weekly thereafter to monitor system performance,conduct routine maintenance, Lo make system adjustments,perform air sparging in MW-3 and MW-4 (if necessary) and monitor the effectiveness of the oxygen releasing compound(if necessary). In accordance with SJVUAPCD requirements, effluent air samples will be collected and analyzed in the field using an w. organic vapor analyzer(OVA) to estimate TPH concentrations. Influent vapor samples will be collected for laboratory analysis on a bi-weekly or monthly basis to assess the progress of the vapor extraction effort and to approximate the total volume of hydrocarbons recovered and destroyed. In addition,effluent vapor samples will be collected for laboratory analysis on a monthly or bi-monthly interval to evaluate the destruction efficiency of �. the oxidizer and to verify that SJVUAPCD emissions requirements are being maintained. Vapor extraction activities will be conducted at the site until TPH and benzene concentrations in L- the influent vapor are reported below the laboratory's method detection limit for two successive months, or when the rate of decreasing TPH and benzene concentrations have reached their respective asymptotic limits for two successive quarters. At that time, vapor extraction activities will be suspended for approximately one month, then reactivated to assess the rebound effect, if any,of TPH and/or benzene concentrations. If TPH and benzene concentrations are observed at similar levels or below the laboratory's method detection limit, then vapor extraction activities at the site will be terminated. Since it appears that the size of the impacted area is relatively small, Park anticipates that cleanup may be accomplished within three to six months. ti.. 9