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potassium carbonate bath develops the exposed plastic, followed by an ammonia etchant which removes 'the exposed copper. For multilayered boards, an electroless copper process takes place to enable conductivity to occur, then the boards are laminated and placed in a copper sulfate plating solution (electroplating). After the copper is plated,the solder is plated, and then the ammonia etchant removes any remaining copper, leaving a fiberglass substrate. Any traces of copper left on the sides of the boards may be covered with solder again or plated with nickel and gold. VI. HAZARDOUS WASTE ACTIVITY DESCRIPTION 1. Dissolving the copper from the exposed areas of the circuit board using ammonia etchant generates the majority of hazardous waste at this facility. Southern California Chemical Company (S.C.C.) manifests this etchant to CP Inorganics in Union City for reprocessing. LIKA manifested 729 tons of etchant to CP Inorganics in 1989. 2. Metal contaminated rags generated from cleaning out machinery and spills are manifested by Chem Waste Management and disposed of at Kettleman Hills. LIKA manifested 40 tons of metal contaminated rags in 1989. 3. Light weight hydraulic oil is used to lubricate the laminate board presses. California oil Recyclers manifests the used oil to a recycling facility named Evergreen in Newark, California. LIKA manifested 200 gallons of used oil in 1989. 4. The metal plating operation generates a hazardous waste water treatment sludge. The hazardous waste water is fed into a series of tanks where NaOH is eventually added creating a metal hydroxide. This metal OH is then fed through a clarifier causing the metal OH solution to settle out. The "metal free" solution goes through a pH adjustment and is then fed to the sanitary sewer. (The discharge to the sewer is under a permit -by -rule process imposed by DHS.) The metal OH particles are pumped into a storage tank where a filter press removes additional liquid. This liquid then returns to the beginning of the hazardous waste water treatment system. The remaining metal sludge is placed in a roll off box and manifested to World Resources in Phoenix for metal reclaimation. LIKA manifested 80 tons of the metal sludge in 1989. 5. The gold plating takes place in a separate bin which is filled with cyanide (used to plate out the gold). The entire contents of the bin is manifested by J and H Reclaimer and taken to their facility in the Hay Area for gold recovery.