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STOCKTON PLATING INC. <br /> Chrome Tank Cleanup and Destruct Operation <br /> The following steps listed are steps that were taken to clean <br /> and destruct a Chrome Tank. The process was started on April 8, 1992 <br /> and completed May 7, 1992. Work was completed as spare time would <br /> allow. Actual time worked on this project was 45 to 50 man hours . <br /> 1 . The Chrome in the tank had dried, therefore we added <br /> water and Sulfuric Acid until a pH 2 was attained. <br /> The Water, Acid and Chrome was mixed into a soluble <br /> state and then it was pumped into the Chrome Destruct <br /> sump where it was treated. The Tank was cleaned. <br /> 2 . The PVC liner was then cut into 2x3 foot sections and <br /> stripped from the tank. <br /> 3 . As the PVC sections were stripped from the Chrome Tank <br /> they were placed into another clean tank for further <br /> treatment. <br /> 4 . The sections were soaked in a Water and Sulfuric Acid <br /> solution with a pH 2 for four days. <br /> 5 . Sodium Metabisulfite was then added to the water and <br /> Sulfuric Acid solution. Sodium Metabisulfite was added <br /> until tests confirmed that the Hexavalent Chrome had <br /> converted to Trivalent Chrome. The PVC sections were <br /> allowed to soak in this solution for another four days . <br /> 6 . A square of approximately 1x1 foot was cut of PVC and <br /> sent to a lab to be analyzed for Chrome. <br /> 7 . The analysis returned positive, and the Chrome has <br /> all converted to Trivalent Chrome, the liner will be <br /> disposed of with other debris in a hazardous waste <br /> landfill. <br /> 9 . An Air Arc Torch was used to cut the tank into small <br /> pieces. <br /> 10 . Once again the metal pieces of the tank were steam cleaned <br /> and rinsed with clear clean water over the Chrome Destruct <br /> Sump. <br /> 11 . The cleaned metal from the tank was hauled to a steel <br /> scrap yard. <br /> Page 1 of 2 <br />