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Stockton Propeller, Inc., OCI Case #15242 Date Samples Collected: June 3, 2021 as they are done using it and discard it with the trash or previously the septic tank. In discussions with M. Belmont, the material in the "DeSmut NSY container was about to be disposed of. Due to the container being unlabeled and that they had no protocol or procedures for hazardous waste disposal of the discarded waste and that they were previously disposing of the waste into the onsite septic tanks this material is a waste. This sample was tested for total metals, WET, TCLP metals, and pH. This sample exceeds the STLC for copper. Pursuant to California Code of Regulations, title 22, section 66261.24(a)(2), this sample exhibits the characteristic of toxicity. The sample also exceeds the toxicity characteristic leaching procedure (TCLP) concentration for cadmium which pursuant to California Code of Regulations, title 22, section 66261.24(a)(1)(B), shows the sample exhibits the RCRA characteristic of toxicity. The pH for this sample is <1.0, which exceeded the pH for hazardous waste and exhibits the RCRA hazardous waste characteristic for corrosivity pursuant to California Code of Regulations, title 22, section 66261.22(a)(1). Thus, the liquid in the container when disposed is a RCRA hazardous waste. Sample SP-03: The sample was collected from a blue 55-gallon barrel labeled "Non-Hazardous Industrial Waste, Rinse Water" from the Etching Room. According to M. Belmont the "rinse water" is'used after dipping the metal plane parts in the "NuEtch EY and "DeSmut NSY solutions. Once the barrel of rinse water" gets full they pH the "rinse water" to determine that the "rinse water" is non- hazardous and dispose of it as a waste into the septic system. This sample was tested for total metals, WET, TCLP metals, and pH. There were no exceedances for metals, WET, and TCLP metals. The pH for this sample is 1.46, which exceeded the pH for hazardous waste and exhibits the hazardous waste characteristic for corrosivity pursuant to California Code of Regulations, title 22, section 66261.22(a)(1) and hence it is RCRA hazardous waste when disposed. Sample SP-04A/13: The samples were collected in the warehouse from an unlabeled, one third full, silverish 55- gallon container with metal black top of"Alodine" rinse water solution. M. Belmont confirmed that the unlabeled container was "Alodine" rinse water solution. M. Belmont stated that staff dips metal plane parts in the "Alodine" solution and then into the "Alodine" rinse water solution to complete the process. M. Belmont stated that they allow the rinse water to evaporate to dispose of it and even hook up a heating unit to the barrel to accelerate the evaporation. When we were there the heating unit was not attached to this container. The "Alodine" rinse water solution is a waste because they evaporate it to dispose of it into the atmosphere This samples were tested for total metals, WET, TCLP metals, pH, chromium VI, cyanide, and Fish Bioassay. Page: 9