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PUBLIC NOTICE Yana Garcia PUBLIC COMMENT PERIOD: 14 April - 14 May 2025 CASE SUMMARY: Water Boards Nicholas Avdis, Chair Page 1 of 2 Former Stockton Propeller, Inc. State Water Resources Control Board Regional Water Quality Control Board, Central Valley Region California Environmental Protection Agency E. Joaquin Esquivel, Chair Secretary for Environmental Protection Public Notice - No Further Action Status Site investigations began in 2022 and continued through 2023. Site investigations include an evaluation of, and liquid samples collected from, the septic tank and leach field, groundwater samples, and soil samples surrounding the septic tank and leach field. The reported concentrations of analytes in soil and groundwater samples do not pose an unacceptable human health risk except for select This Public Notice fact sheet provides general information on the Site. A map showing the location of the Site is attached (Figure 1). Central Valley Water Board staff concurs with SPI's request for regulatory closure, or ‘no further action’ (NFA). The Site is located within a mixed-use property complex that includes residences and industrial businesses. The property consists of six buildings on a 1,69-acre parcel located south of State Highway 88, near its intersection with Wilcox Road. SPI leased and occupied two buildings; the main building is located adjacent to the northern property boundary and the other building is a warehouse, which is located along the northeastern property boundary. Prior to closing business operations on 31 May 2024, SPI was a Federal Aviation Administration (FAA) Certified Repair Station specializing in full-service governor and metal propeller overhaul and maintenance. Chemicals used on-Site for repair and maintenance of propellers were stored in SPI’s warehouse and used in the inspection and etch rooms. From approximately 14 June 2005 until 19 May 2021, liquid generated from industrial wastewater operations were improperly disposed of into the on-Site septic system which was not functioning as designed during the suspected discharge period due to a damaged pipe connecting the septic tank to the leach field. The industrial wastewater included rinseate generated from Ardrox 985 P14 (penetrant dye primarily consisting of petroleum distillates and aromatic hydrocarbons), NuEtch E3 (potassium hydroxide), and DeSmut NS3 (sulfuric and nitric acid). Public Notice: The California Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board) invites public comment on a request for regulatory closure, made on behalf of Stockton Propeller, Inc. (SPI) formerly located at 2478 Wilcox Road, Stockton, San Joaquin County, California (Site). ~ Stockton Propeller, Inc. Stockton, CA