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Stockton Propeller, Inc. - 6 - 10 May 2022 Order R5-2022-0806 b) 1 December 2021: "our employees observed and inspected the properties septic system. They observed it to be full." c) 14 December 2021 : "our employees observed and inspected the property's septic system. They observed it to be close to empty." d) 21 December 2021: "our employees observed and inspected the property's septic system. They observed it to be full." 17.SP1 and the Chandlers have denied pumping or tampering with the septic tank. It remains unclear why the septic tank contents reportedly fluctuated by several feet in mid-December 2021. Subsequent reports of the contents of the septic tank indicate it has remained stable ever since (VRC Metals, 2022c). 18.The DTSC has classified samples collected from containers that were previously disposed of into the on-Site septic system as corrosive (SP-02 and SP-03), and toxic (SP-02). Disposing these materials to the on-Site septic tank may have corroded the walls of the septic tank, allowing the contents of the septic tank to be in contact with the surrounding soils and potentially reaching groundwater. It is assumed that the liquid contents of the septic tank are designed to exit the tank and discharge to a corresponding soil leach field, as most septic systems are designed. Therefore, it is likely that chemicals discharged to the on-Site septic system have been subsequently discharged to soil, wherein they likely pose a threat to a water or waters of the State. 19.On 13 January 2022, SPI notified Central Valley Water Board staff via email that two (2) samples were collected from the septic tank on 20 December 2021 (VRC Metals, 2022a).4 The laboratory results indicated concentrations of cadmium and lead above the United States Environmental Protection Agency (USEPA) maximum contaminate level (MCL), and concentrations of copper, vanadium, and zinc above the San Francisco Bay Regional Water Quality Control Board's Tier 1 Environmental Screening Levels (ESLs). 20.On 22 February 2022, SPI submitted a Sampling Plan prepared by NES, Inc. (NES), to propose sampling soils surrounding the septic tank (NES, 2022). Central Valley Water Board staff have reviewed, commented on the report, and requested a revised version by 25 April 2022 (Central Valley Water Board, 2022a). The Sampling Plan does not propose to sample and evaluate the conditions of the septic tank, to locate and sample the leach field, or to sample groundwater. Central Valley Water Board staff have requested a revised report to include the additional investigation. On 16 April 2022, Blankinship & Associates, Inc. informed Central Valley Water Board staff via email that they are assisting SPI in resubmitting the sampling plan and requested an extension to 25 May 2022. On 18 April 2022, Central Valley Water Board staff approved the extension via email (Central Valley 4 It is not clear what methods were used to collect the samples from the septic tank and whether a qualified person collected the samples.