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Stockton Propeller, Inc., OCI Case #15242 Date Samples Collected: June 3, 2021 Lew collected the sample from the bucket, with a new plastic scoop into a new, clean, clear 32- ounce glass jar and closed the lid. Friend then placed a label on the jar along with evidence tape on the lid. Salas photographed the sample near where it was collected (Attachment 2. Photographic Log, Photos IMG 4415 to 4419; 4432). 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 (Attachment 1: Site and Sample Maps). The cleaning machine cleaned plane parts by using various grit blasted at the plane parts. As with Samples SP-07 and SP-09, M. Belmont stated that all of the material from the filter compartments were discarded as a waste into the trash up until the May CUPA site visit. The contents of the filter compartment were a light grey, extremely fine powder, solid material. Myers noted the MultiRAE detected low levels of VOCs in the "Cleaning Room". Lew collected the sample from the filter compartment, with a new plastic scoop into a new, clean, clear 32-ounce glass jar and closed the lid. Friend then placed a label on the jar along with evidence tape on the lid. Salas photographed the sample near where it was collected (Attachment 2: Photographic Log, Photos IMG-4420 to 4425). 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 (Attachment 1: Site and Sample Maps). As with Samples SP-07 and SP-08, M. Belmont stated that all of the material from the filter compartments were discarded as a waste into the trash up until the May CUPA site visit. The contents of the filter compartment were a light grey, coarse powder, solid material. Myers noted the MultiRAE detected low levels of VOCs in the "Cleaning Room". Lew collected the sample from the filter compartment, with a new plastic scoop into a new, clean, clear 32-ounce glass jar and closed the lid. Friend then placed a label on the jar along with evidence tape on the lid. Salas photographed the sample near where it was collected (Attachment 2: Photographic Log, Photos IMG-4426 to 4431). Sample SP-10AIB: The samples were collected in the "Inspection Room" underneath the sink from a seven-gallon holding container (Attachment 1: Site and Sample Maps). The holding container contained the rinse water from the inspection process. Staff from Stockton Propeller check the plane parts for cracks and deformities by dipping the part into a chemical solution called Ardrox. After dipping the plane part in Ardrox they then rinse the chemical solution with water and keep the rinse water and solution in a holding container until the container is full or considered too concentrated to rinse any more. Previously, they had been disposing of this wastewater into the onsite septic tank. The holding container was first tested with pH paper (pH 4.0) before sampling. Lew collected the samples from the holding container using a new, clean, clear 16-ounce jar and transferring the samples into a new, clean, clear 32-ounce glass jar and a new, clean, amber 16- ounce glass jar and closed each lid. The samples collected were a clear yellowish liquid. Friend then placed labels on each jar along with evidence tape on the individual lids. Salas photographed the samples near where they were collected (Attachment 2: Photographic Log, Photos IMG-4436 to 4441). Page: 7