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approximately 50% pure ink, 25% alcohol/water mixture, and 25% extender. In <br /> addition, ammonium hydroxide may be used, if necessary, to raise the pH of the <br /> ink mixture to 9. A pH below 9 may cause the ink pigment to separate, resulting <br /> in color streaking. A high pH may result in the erosion of the cylinder of the <br /> printing press. <br /> After printing sheets of paperboard with the ink mixtures, the products are then <br /> sent to the Finishing Department where they are folded and glued into their final <br /> shapes. <br /> When the printing presses are drained and cleaned, much of the ink is saved for <br /> re-use. Large machine parts are put into one of two cleaning baths in the "Off <br /> Press Make Ready" room (OPMR). Residual ink is washed off the parts and <br /> water/alcohol/heavy metals rinsate is collected and stored on site. <br /> Dopaco occupies a 17,200 square foot building and employs 200 workers. <br /> VI. HAZARDOUS WASTE ACTIVITY DESCRIPTION: <br /> Dopaco generated 74.28 tons of hazardous waste in 1992. The primary waste <br /> stream is generated via the printing process. Waste water from the printing <br /> presses is contaminated with ink and alcohol, and is classified as hazardous due to <br /> its flammability. Approximately 61.34 tons of this waste was manifested for <br /> disposal in 1992. This waste was transported and treated by Romic Chemical, 2081 <br /> Bay Rd., East Palo Alto, CA. <br /> Waste oil, generated primarily in the finishing room, is generated mainly from <br /> machinery oil changes. The oil consists of silicone oil, gear oil, and mineral oil. <br /> Approximately 9.28 tons of oily hazardous waste was generated in 1992. Ramos <br /> Environmental Services, P.O. Box 401, West Sacramento, CA. hauls this waste for <br /> recycling. <br /> Cleaning solvents make up the next category of hazardous waste. Approximately <br /> 0.42 tons of Safety Kleen waste was manifested for disposal. In addition, a one <br /> time "house cleaning" event generated 1.92 tons of hazardous waste. The wastes <br /> consisted of waste alkaline, aluminum sulfate solution, ferric sulfate solution, and <br /> sodium hydroxide compound. Beth Pratt stated that these materials were primarily <br /> used for cleaning the equipment but are no longer being used because of their <br /> hazardous characteristics. <br /> Solid hazardous waste makes up the last category. Plastic bags, rags, absorbent <br /> materials, and other materials contaminated with ink and alcohol account for 1.32 <br /> tons of the total hazardous waste generated. Again, Romic Chemical transported <br /> and disposed of this waste. <br /> 3 <br />