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Stockton Propeller, Inc., OCI Case #15242 Date Samples Collected: June 3, 2021 Sample SP -02: The sample was collected in the "Etching Room" from the unlabeled container of "DeSmut NS3" solution (Attachment 1: Site and Sample Maps). M. Belmont and Stockton Propeller, Inc. staff confirmed that the unlabeled container (Photo IMG_4368) was their "DeSmut NS3" solution. Staff from Stockton Propeller, Inc. dips their metal plane parts in the "DeSmut NS3" solution for etching as the third step of their process. Lew collected the sample from the "DeSmut NS3" 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 milky white liquid. Friend then placed a label on the jar along with evidence tape on the lid. The sample was tested with pH paper (pH 0.0) during the sampling process. Sales photographed the sample near where it was collected (Attachment 2: Photographic Log, Photos IMG -4376 to 4381). Photo: IMG 4368 Sample SP -03: The sample was collected in the "Etching Room" from the blue barrel labeled "Non -Hazardous Industrial Waste, Rinse Water (NuEtch E3, DeSmut NS3 & Water)" (Attachment 1: Site and Sample Maps). M. Belmont and Stockton Propeller, Inc. staff confirmed that the blue barrel was the rinse water they used after dipping the metal plane parts in either the "NuEtch E3" solution or the "DeSmut NS3" solution. Lew collected the sample from the rinse water 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 cloudy clear liquid. Friend then placed a label on the jar along with evidence tape on the lid. The sample was tested with pH paper (pH 2.0) during the sampling process. Sales photographed the sample near where it was collected (Attachment 2: Photographic Log, Photos IMG_4382 to 4385). Sample SP-04A/B: The samples were collected in the warehouse from an unlabeled, one third full, silverish 55 - gallon container with a metal black top of "Alodine" rinse solution (Attachment 1: Site and Sample Maps). M. Belmont and Stockton Propeller, Inc. staff confirmed that the unlabeled container was "Alodine" rinse solution. Staff from Stockton Propeller, Inc. dips their metal plane parts in the "Alodine" solution and then into the "Alodine" rinse solution to complete the process. Myers noted the MultiRAE (a portable multi gas detector) which measures the concentration of Volatile Organic Compounds (VOCs) in the air, detected 7ppb of cyanide gas during monitoring of the "Alodine" rinse solution. Lew collected the samples from the "Alodine" rinse solution using a new, clean, Coliwasa tube, through the bung hole, and transferred the sample into a new, clean, clear 32 -ounce glass jar. Myers, using a new 50ml bellows sample bulb, transferred part of the sample from the 32 -ounce glass jar into an amber 16 -ounce jar. Once the amber 16 -ounce jar was filled the lid was secured. Lew continued to fill the 32 -ounce jar and secured the lid once completed. Two jars, a 16 -ounce glass amber jar and a 32 -ounce clear glass jar were filled with the sample, a dark brown liquid. Friend placed labels on each jar along with evidence tape on the individual lids. The samples were tested with pH paper (pH 2.0) during the sampling process. Salas photographed the Page: 5