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Stockton Propeller, Inc., OCI Case #15242 Date Samples Collected: June 3, 2021 New sample collection devices and sample containers were used to collect samples. Disposable outer gloves were changed between each sample collected. Samples were labeled with identifying information, evidence tape was applied to each container, and the samples were photographed near where they were collected. Sampling Strategy: The samples collected were selected based upon locations where hazardous waste was suspected of being illegally stored, treated, and disposed of by using May 18, 2021, CUPA inspection report and our observations. I provided J. Boone with a copy of the Sampling Receipt once we completed our sampling event (Attachment 3: Sample Receipt). Chain of Custody: I maintained custody of the samples as they were being collected on June 3, 2021. 1 observed the samples being collected and once labeled and sealed with evidence tape placed the samples into a cooler with ice. After sampling was complete, I maintained custody of the cooler and placed it in the back of the vehicle and transported the samples to the DTSC ECL located at 700 Heinz Avenue, Berkeley, CA 94710. When I arrived at ECL, I transferred custody of the samples along with the respective Sample Analysis Request/Chain of Custody form to Francisco Montalvan, Environmental Scientist. Montalvan signed and dated the form and provided me a copy (Attachment 4: Sample Analysis Request and Chain of Custody). Sample Details Sample SP -01: The sample was collected in the "Etching Room" from the unlabeled container of "NuEtch E3" solution (Attachment 1: Site and Sample Maps). M. Belmont and Stockton Propeller, Inc. staff confirmed that the unlabeled container (Photo IMG 4372) was their "NuEtch E3" solution. Staff from Stockton Propeller, Inc. dips their metal plane parts in the "NuEtch E3" solution for etching as the first step of their process. Lew collected the sample from the "NuEtch E3" solution using a new, clean, Coliwasa tube and transferred the sample into a new, clean, clear 32 -ounce glass jar and closed the lid. The sample collected was a dirty brown/amber liquid. Friend then placed a label on the jar along with evidence tape on the lid. The sample was tested with pH paper (pH 14.0) during the sampling process. Sales photographed the sample near where it was collected (Attachment 2: Photographic Log, Photos IMG -4369 to 4375). Page: 4 Photo: IMG 4372