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Tank Triple Rinsing <br /> Triple rinsing will consist of spraying the inside of each tank with a mixture of trisodium <br /> phosphate and water to remove any sludges or solids. Following each rinsing, the rinsate <br /> will be removed by vacuum truck. Rinsing will continue until the SJLHD is satisfied the <br /> tanks and sump have been sufficiently rinsed. The accumulated rinsate will then be <br /> transported by a State of California licensed hazardous waste hauler (AEMC) under <br /> hazardous waste manifest to a TSD facility for treatment. <br /> Tank Purging <br /> Prior to filling the tanks and sump with a cement slurry, both tanks will be purged of <br /> flammable vapors to the satisfaction of the City of Stockton Fire Department. Both tanks <br /> will be purged using pelletized dry ice, at a ratio of 15 pounds of dry ice for every <br /> 1,000 gallons of tank capacity. The total amount of dry ice utilized will be verified to the <br /> City of Stockton Fire Department by sales receipt. The dry ice will be allowed to sublime <br /> and displace the atmosphere in each tank for thirty minutes. <br /> Cement Slurry Mix Tank Filling <br /> Both tanks and sump will be filled with a cement slurry mix acceptable to the City of <br /> Stockton Fire Department. The slurry mix will have a minimum of one and three-quarters <br /> (1-3/4) sacks of cement per yard of total mix. The amount of cement slurry mix will be <br /> equal to the displacement of the total volume of each tank and sump. <br /> rlgom(�) Page 6 <br />