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Stockton Propeller, Inc., GCI Case ##15242 Date Samples Collected: June 3, 2021 Up to this Section was completed as of June 11, 2021. IV. Laboratory Results and Waste Determination A total of thirteen (13) samples were collected during the inspection. All samples were analyzed for Total Metals and soluble metals. Soluble metals were analyzed using the California Waste Extraction Test (WET) and the federal Toxicity Characteristic Leaching Procedure. All samples were analyzed for the Power of Hydrogen (pH) and two samples were analyzed,for chromium VI (US EPA Method 7199) and cyanides. Two samples were also analyzed to determine the aquatic toxicity which was measured using the California Department of Fish and Game bioassay method. The fish bioassay threshold is determined by the LC5o after 96 hours, the lethal concentration of toxicant that would cause death to 50% of the test organisms. We have not received the laboratory results for either cyanide or the Fish Bioassay, when the results come in and if they are deemed significant, we will make an addended report. Table 1 on pages 13-16 summarizes the significant results, for details and all results see Attachment 5: Analytical Laboratory Reports. All analyses were done using EPA-approved SW-846 Test Methods for Evaluating Solid Waste, Physical/Chemical Methods, methods cited in CA code of Regulations, title 22, division 4.5, chapter 11, or the DTSC ECL approved test methods taking into consideration the Safety Data Sheets from the noted products. Of the samples analyzed, six samples are characterized as toxic (SP-02, SP-04, SP-05, SP-07, SP-08, and SP-09) and three samples are characterized as corrosive (SP-01, SP-02, and SP- 03). Sample SP-01: The sample was collected from the used unlabeled container of "NuEtch E3" solution from the "Etching Room". According to M. Belmont the "NuEtch EY solution becomes a waste as soon as they are done using it and discard it with the trash. In discussions with M. Belmont, the material in the "NuEtch EY 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. There were no exceedances for metals, WET, and TCLP metals. The pH test is used to specify if the sample exhibits characteristics of corrosivity. The sample exhibits corrosivity if it produces a solution having a pH < 2 or ?12.5. The pH for this sample is >13.0 and thus exhibits the hazardous waste characteristic for corrosivity pursuant to California Code of Regulations, title 22, section 66261.22(a)(1) and hence it is .a RCRA hazardous waste when disposed. Sample SP-02: The sample was collected from the used unlabeled container of"DeSmut NS3" solution from the "Etching Room". According to M. Belmont the "DeSmut NS3" solution becomes a waste as soon Page: 8