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Stockton Propeller, Inc., OCA Case #15242 V Date Samples Collected: June 3, 2021 Sample SP -08: The sample was collected in the "Cleaning Room" from the filter compartment at the base of the unlabeled cleaning machine at the far right of the room. The contents of the filter compartment were a light grey, extremely fine powder, solid material. M. Belmont stated that they had been disposing of this material in the trash as a waste without any type of hazardous materials manifest. This sample was tested for total metals, WET, TCLP metals, and pH. This sample exceeds the TTLC for cadmium and the STLC for cadmium and lead. 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 TCLP concentration for cadmium, which pursuant to California Code of Regulations, title 22, section 66261.24(a)(1)(B), shows the sample exhibits the characteristic of toxicity and thus is a RCRA hazardous waste. The pH for this sample is 6.88 which does not exceed the regulatory threshold. Sample SP -09: The sample was collected in the "Cleaning Room" from the filter compartment at the base of the machine identified as "Universal" on the front plaque. The contents of the filter compartment were a light grey, coarse powder, solid material. M. Belmont stated that they had been disposing of this material in the trash as a waste without any type of hazardous materials manifest. This sample was tested for total metals, WET, TCLP metals, and pH. This sample exceeds the TTLC and STLC for cadmium. 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 TCLP concentration for cadmium, which pursuant to. California Code of Regulations, title 22, section 66261.24(a)(1)(B), shows the sample exhibits the characteristic of toxicity and thus is a RCRA hazardous waste. The pH for this sample is 9.71 which does not exceed the regulatory threshold. Sample SP -10A/13: The samples were collected in the "Inspection Room,". underneath the sink, from a seven -gallon holding container. The holding container contained the rinse water from the inspection process using the chemical solution Ardrox to dye and identify metal plane parts. This rinse water is considered a waste. Previous to this inspection M. Belmont stated that they had been disposing of this rinse water into the septic system. This sample was tested for total metals, WET, TCLP metals, pH, and Fish Bioassay. Sample SP -10A did not exhibit a characteristic of hazardous waste for total metals, WET, TCLP metals, and pH (7.69). Sample SP -10B for the Fish Bioassay is still undergoing laboratory testing and will provide an addendum if needed. Page: 12