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From:Harold S.Pe m Hamid S.Peters:Phi REA 91693UV8 To:Bob Hundq at Stockton Ph6np Pap,dofd T.Ww.May M.19%6:16:Q PM Stockton Plating Closure of PBR treatment system Page 3 Removable Equipment The metal tanks of the system will also be cleaned using techniques developed after visual inspection of the interior of the tanks. These tanks will be prepared for sale unless severe corrosion is found during the inspection. All equipment will be thoroughly triple washed with a high pressure hot water washer. The rinseate will be batch treated and batch tested before being discharged. After the third rinse has been drained from the equipment, a one gallon rinse of 5 pH HCI will be sprayed on the inside surfaces of the equipment. The acidic rinseate will be sampled and tested for copper, chromium and nickel. A water rinse will follow the acidic rinse. Results below the TTLC will be considered acceptable for releasing the equipment for sale. Results above the TTLC will result in the rinsing process being repeated under the rinseate is acceptable. Equipment not acceptable for sale as used equipment will be disposed of as scrap metal or as municipal waste. Building When the below grade tanks have been flushed and initially cleaned, the walls and floors of the area will be thoroughly washed using a high pressure hot water spray system. This wash water will go into the below-grade sumps and be processed by the treatment system. After all of the equipment has been decontaminated and determined to be ready for sale, the floors will be mopped using a clears mop head. Chip samples of the floor will be taken using a 1/2" drill. If the chip sample results are less than 50% of the TTLC values for the metals, the tested surfaces will be considered acceptable. If the results are not acceptable, the moping process will be repeated until the results meet the above criteria. Certification Mr. Harold S. Peters; registered Professional Engineer in Safety Engineering in California has been retained to advise on how to close the facility and to provide the certification of closure. At the successful completion of closure, the certification that the closure was in compliance with the closure plan and that the closure plans meets all known standards for closure will be prepared, signed and stamped.