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Address: Stockton Propeller, 2478 Wilcox Road, Stockton Record ID PR05448740 <br /> Date: 5-18-21 Program: HW generator <br /> A <br /> .. yfti � �wy <br /> IMG_0531. Etching Room. The site uses the container within the red containment to store NuEtch E3 (potassium hydroxide solution,pH <br /> 13.9). The site processes propeller parts by dunking in the NuEtch container, dunking in the Desmut container and then rinsing with water in <br /> the blue container. Desmut NS3 (sulfuric and nitric acid, pH<1) is stored in the grey container. Mike Belmont stated that the NuEtch and <br /> Desmut, when spent, are mixed together and discharged to the septic tank. The spent rinse water and the mixed NuEtch and Desmut <br /> solutions going into the septic tank need documented hazardous waste determinations. The waste solutions may contain regulated amounts of <br /> metals. If found to be hazardous wastes they must be disposed of as specified in the California Health & Safety Code and Title 22 California <br /> Code of Regulations . Mixing NuEtch and Desmut together is hazardous waste treatment, which requires a permit since this process is <br /> neutralization of two corrosive hazardous waste solutions. <br /> Garrett Backus, REHS Page 13 of 52 <br />