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Stockton Propeller Sampling and Analysis Plan 1 Introduction The Stockton Propeller, Inc. (SPI)facility is located at 2478 Wilcox Road in Stockton, California - refer to Figures 1 and 2. SPI is located within a mixed-use property complex that includes both industrial and residential uses. . SPI is a Federal Aviation Administration (FAA) Certified Repair Station,which specializes in full-service governor, metal, and composite propeller overhaul and maintenance. SPI is an expert in blade overhaul and reconditioning.This technology-based art form uses force application devices in combination with time-proven manual techniques, and includes bead-blasting, and painting operations. Chemicals used on-site for repair and maintenance of propellers are stored in SPI's warehouse and used in the inspection and etch rooms- refer to Attachment 1 for a list of chemicals. Prior to May 19, 2021, liquid generated from Ardrox Dye Penetrant,and etching(NuEtch E3& DeSmut)operations were disposed of into the on-site septic system.The Ardrox Dye Penetrant rinse water was disposed of via a sink that drained into a 10-gallon plastic tub with a submersible pump in the Inspection room which pumped the rinse water via a hose through the ceiling into a vent pipe that is connected to drain lines in the restrooms which empty into the septic tank.The NuEtch E3 and DeSmut rinse water was first tested for pH, and once pH was 7-8, drained into the sink in the Etch room which gravity fed into the septic tank. Refer to Figure 3 for map of Inspection and Etching rooms. Since May 19, 2021, or shortly after,the hoses from the Inspection room and sink in the Etch room were removed and Ardrox Dye Penetrant, NuEtch E3, and DeSmut rinse water have been accumulated on-site in plastic 55-gallon drums, managed by the on- site EHS technician,and transported off-site by hazardous waste vendors. The size, depth, configuration, and existence of a leach field associated with the septic system is unknown. According to SPI staff,the septic system is connected to their property and possibly to the property to the south, currently occupied by Formurex, a pharmaceutical manufacturing facility. However, the connection to Formurex has not yet been confirmed. Other connections to the septic system, if any, are unknown. Blankinship&Associates, Inc. Page 1 of 20 September 23, 2022 NES, Inc.