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KSMA Working To Restore Nature Addendum One to Remedial Action Plan March 1, 1993 Coca-Cola Former Distribution Facility, Stockton, California 54006.01 sandy silts), and the proposed vacuum and flow rates (60-inches of water and 225 cfm total flow) Enclosed in Appendix C is a summary of the manufacturer's description of the ' thermal oxidizer (USTEC, September 1991). The thermal oxidizer has already been purchased by Coca-Cola. It has a peak flow of 600 cfin at a peak vacuum of 12-inches of mercury(163-inches of water), and a 40 horsepower regenerative blower This is more than adequate to meet the proposed design conditions, and will allow additional capacity if an additional well(s) is added to the system at a future date. The thermal oxidizer will most likely be permitted for its full operating capacity of 600 cf n, in order to accommodate the ' addition of more vapor wells to the system if needed, and in order to increase the well flows in VEW-2, VEW-3, and VEW-7 as conditions allow Sipill Prevention and Safety Plan To reduce daily manpower needs for operations and maintenance of the system, and to prevent safety hazards or violations of permit conditions, a remote monitoring system and necessary instrumentation will be designed. The off-gas abatement device will be equipped with the following: a low and high temperature shutdown; a high petroleum hydrocarbon concentration shutdown; a flash back flame arrestor; a fuel high and low pressure system shutdown switch; a low pressure switch influent to the blower in the event of blower failure A remote monitoring system will be installed to continuously monitor and periodically report 1 the process variables that can influence the system's performance and cause an alarm or shutdown condition. The condensate storage tank will be contained within a double containment tank to prevent spillage of condensate. Pro'ected Gasoline Removal Rates The amount of TPHg in the subsurface soil in the vicinity of the former underground gasoline storage tank was previously estimated at about 9,560 pounds of TPHg (USTEC, September 1991) RESNA's estimate is less than this amount, but the more conservative, worst case USTEC value will be used for permitting in the event that this additional time may be needed If the amount of TPHg is lower, then the clean up time will be ' correspondingly shorter. With three vapor wells on line at an average of 75 cfm per well, the total flow rate will be ' 225 cf n. At startup, it is recommended that during approximately the first month of operation VEW-3 will be the only operating well, until some of the highest vapor concentrations beneath the tank pit are removed. This method of operation will contain petroleum hydrocarbon vapors beneath the tank pit, and reduce lateral and vertical migration of the vapors during vapor extraction. At an average startup TPHg concentration 6