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The resulting liquid then returns to the beginning of the wastewater treatment system. The remaining metal sludge is placed in a rolloff bin and manifested offsite as hazardous waste. The discharge process is under permit through Municipal Utilities who determines the allowable metal concentration requirements in the effluent. LIKA submitted to Cal-EP,A/DTSC an onsite hazardous waste treatment notification form for tiered permitting for the wastewater treatment operation. VI. HAZARDOUS WASTE ACTIVITY DESCRIPTION: 1. Dissolving the copper from the non -circuit areas of the board using ammonia enchant generates the majority of hazardous waste at this facility. In 1993, 421.27 tons of this waste was manifested to Southern California Chemical, 8851 Dice Rd., Santa Fe Springs, CA 90670. 2. Another wastestream encompasses all copper contaminated debris. This would include such waste as absorbent and rags used to clean and contain spills and filters generated from the batch treatment and plating process. In 1993, 18.05 tons was manifested to Chemical Waste Management, 35251 Old Skyline Blvd., Kettleman City, CA 93234. 3. Lightweight hydraulic oil is used to lubricate the laminate board presses. The waste oil is hauled and recycled by Evergreen Environmental Services, 6880 Smith Ave., Newark, CA 94560. In 1993 LIKA generated .42 tons of this waste. 4. The wastewater treatment operation generates a filter press cake (sludge). This waste is transported to World Resources Company, 8113 W. Sherman St., Phoenix, AZ 85403 for metal reclamation. LIKA manifested 180.6 tons of this waste in 1993. 5. Solder dross waste is generated from a tin solder bath. The waste is hauled to ESC refining, 705 Reed St., Santa Clara, CA 95050. In 1993, 4.58 tons of this waste was manifested offsite. 6. Solder mask is applied to the circuit boards to cover designated areas from becoming plated. A solvent/ soldermask overspray wastestream is generated from this application process. Solvent is used to flush the lines of the spray application mechanism. The soldermask "overspray" is squeegeed and collected to be disposed of with the waste solvent. Safety Kleen hauled 4.96 tons of this waste offsite. 7. Because of #6 above, a soldermask contaminated debris wastestream is generated. This consists of such wastes as filters, tape, etc., generated from the soldermask spraying operation. LIKA generated 1.03 tons of this waste which was hauled to Chemical Waste Management.