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TREATMENT SCHEME Two 500 bbl Baker T-tanks will be operated in swing to produce approximately 40,000 gallons of treathe drain valve located eudnderl thet tcooling water storage tank 1h per day. ese tanks A Libbey-Owen-Ford Co.oaccept a charge directly lepresentatiive will operate this valve as required. Once filled to a volume of approximately 20,000 gallons of raw cooling water the pH within the tank will be adjusted to value of approximately 2. Sodium metabisulfite will be added to the tank fully reduce the hexavalent chrome to provide a reducing environment of sufficient strength to to trivalent. Chemical addition will be via a dry eductor. Please note this is a process change from our original proposal. Our pilot study has shown that no S02 will be tank will be colve using ircud to this process. It also will speed up the treatment timing. The achieve mixing of chemicals without air induction. This reduces chemical loss through oxidation. After a sufficient time frame for the reaction to go to completion has elapsed, test solution for hexavalent chrome. If hexvalent chrome is present, add sodium metabisulfite and adjust pH to 3 for additional treatment. At this point, adjust ph to •5using a sludge hydrated within the treatment this pH, the trivalent chrome will precipitate as Cr(011)3 g g Following lime addition, add polymer, mix for one minute and allow flock to settle. The entire content of the treatment tank will then be filtered using a 60 cubic foot plate&frame filter press. The resulting liquid being fee of solids and therefore chrome. This filtrate will be stored in a holding tank to await analytic results before being discharged to the local POTW at a rate of 60,000 gallons every fifth day. A diagram of the complete process can bound will in the appendix. The solids (filter cake) that are produced during the dewatering operation transferred to roll off bins for subsequent disposal. this processing scheme has been demonstrated successfully at a number of job sites within the western United States. Laboratory results for cooling water samples from Libbey-Owens-Ford Co. are as follows: Crs+ Total Pre Treatment 345 350 Post Treatment ND <A These results are typical of what is observed using this process. By using two treatment tanks in swing operation the following advantages are obtained: • Cost effective utilization of manpower and capital equipment (filter press). • Guaranteed daily out puts of 40,000 gallons with an 8 hour day. • Completion of the project within the 6-week time frame requested by Libbey- Owens-Ford Co.