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Working To Restore Nature <br /> Addendum One to Remedial Action Plan March 1, 1993 <br /> Coca-Cola Former Distribution Facility, Stockton, California 5400601 <br /> sandy silts), and the proposed vacuum and flow rates (60-inches of water and 225 chn total <br /> flow). Enclosed in Appendix C is a summary of the manufacturer's description of the <br /> thermal oxidizer (USTEC, September 1991). The thermal oxidizer has already been <br /> purchased by Coca-Cola It has a peak flow of 600 cfin at a peak vacuum of 12-inches of <br /> mercury(163-inches of water), and a 40 horsepower regenerative blower. This is more than <br /> adequate to meet the proposed design conditions, and will allow additional capacity if an <br /> ' additional well(s) is added to the system at a future date. The thermal oxidizer will most <br /> likely be permitted for its full operating capacity of 600 cfm, in order to accommodate the <br /> addition of more vapor wells to the system if needed, and in order to increase the well flows <br /> ' in VEW-2, VEW-3, and VEW-7 as conditions allow. <br /> 1 1 <br /> Spill Prevention and Safety Plan <br /> I <br /> To reduce daily manpower needs for operations and maintenance of the system, and to <br /> prevent safety hazards or violations of permit conditions, a remote monitoring system and <br /> necessary instrumentation will be designed. The off-gas abatement device will be equipped <br /> with the following: a low and high temperature shutdown; a high petroleum hydrocarbon <br /> concentration shutdown; a flash back flame arrestor; a fuel high and low pressure system <br />` shutdown switch; a low pressure switch influent to the blower in the event of blower failure. <br /> A remote monitoring system will be installed to continuously monitor and periodically report <br /> the process variables that can influence the system's performance and cause an alarm or <br /> shutdown condition. The condensate storage tank will be contained within a double <br /> containment tank to prevent spillage of condensate. <br /> Pro'ected Gasoline Removal Rates <br /> ' The amount of TPHg in the subsurface soil in the vicinity of the former underground <br /> gasoline storage tank was previously estimated at about 9,560 pounds of TPHg (USTEC, <br /> September 1991). RESNA's estimate is less than this amount, but the more conservative, <br /> worst case USTEC value will be used for permitting in the event that this additional time <br /> may be needed. If the amount of TPHg is lower, then the clean up time will be <br />{ ' correspondingly shorter. <br /> With three vapor wells on line at an average of 75 cfm per well, the total flow rate will be <br /> 225 cfm. At startup, it is recommended that during approximately the first month of <br /> operation VEW-3 will be the only operating well, until some of the highest vapor <br /> concentrations beneath the tank pit are removed. This method of operation will contain <br /> petroleum hydrocarbon vapors beneath the tank pit, and reduce lateral and vertical <br /> migration of the vapors during vapor extraction. At an average startup TPHg concentration <br /> 6 <br />