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V. GENERAL DESCRIPTION OF FACILITY: <br /> Dopaco manufactures paperboard cartons, paperboard cups, and plastic cup lids <br /> for the fast-food industry. Rota-gravure printing presses are used to print designs <br /> onto paperboard with inks. Dopaco purchases water-based ink and mixes it with <br /> an extender and an alcohol/water mixture before using it for printing. The <br /> extender is composed of the same constituents as the ink, but does not contain <br /> any pigments. The alcohol/water mixture, which may include isopropyl alcohol, <br /> isobutyl alcohol, and n-propyl alcohol, is composed of approximately 80% water <br /> and 20% alcohol and is added to the ink in order to maintain the desired viscosity <br /> and color of the product. The final ink mixture used for printing is composed of <br /> 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 onsite. <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 and 65.151 tons in 1993. <br /> The primary wastestream is generated via the printing process. Wastewater from <br /> the printing presses is contaminated with ink and alcohol, and is classified as <br /> hazardous due to its copper content. Approximately 52 tons of this waste was <br /> manifested for disposal in 1993. This waste was transported and treated by Romic <br /> Chemical, 2081 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 8 tons of oily hazardous waste was generated in 1993. Ramos <br /> Environmental Services, P.O. Box 401, West Sacramento, CA hauls this waste for <br /> recycling. <br /> 3 <br />