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Stockton Propeller Sampling and Analysis Plan 3 Proposed Investigation Tasks Prior to initiation of investigation activity, SPI will obtain permission from the property owner and inform neighbors of the proposed activity. Additionally, SPI will notify Board staff no less than 5 days prior to commencement of the tasks described below. Because information gathered in one or more tasks may influence other tasks, an iterative approach will be used and as such addenda to this workplan may be prepared. Further, depending on results of field activity during subsurface exploration, decisions in the field based on professional judgment may be made related to the number,type, depth, and location of one or more borings. In the event that Board staff are unable to observe investigation activities,field staff will attempt to contact Board staff via telephone to discuss and obtain concurrence for significant changes in the SAP. All deviations from the final SAP will be documented in the Site Investigation Report. 3.1 Septic Tank Content Previous work by SPI assessed the content of the SPI septic tank(s). Results are summarized in Attachment 2 and suggest that the contents of the tank were non-hazardous. To confirm the earlier work by SPI,two discrete liquid samples will be collected from the septic tank (one sample from the influent compartment and one from the effluent compartment). If feasible, a third sample will be collected from the effluent screen. Analysis of these samples will used to assess the nature of the septic tank contents and to identify disposal options.To the extent feasible, samples will be collected near the entrance and exit of the tank. A coliwasa or similar type sampler will be used by Hazardous Waste Operations and Emergency Response (Hazwoper)-trained field personal who will wear Level C personal protective equipment(PPE) including the use of Tyveks, latex gloves, and face protection.The coliwasa sampler will be disposed of or triple rinsed with distilled water between sampling locations to minimize cross contamination. On-site tap water will be collected from one of the sinks as a control sample, and one field blank will be collected for quality control purposes. The contents of the influent compartment will be assessed for stratification and other indications that the tank is not processing waste properly. Samples will be placed in laboratory-supplied containers and transported to an ELAP-certified analytical laboratory under chain of custody(COC) procedures in iced coolers. Samples will be analyzed to assess characteristics of toxicity(California Code of Regulations (CCR),Title 22, section 66261.22) and corrosivity(CCR,title 22, Section 66261.24).Samples will also be analyzed for: 1. Metals/TCLP Scan- USEPA Method 1311/6010C 2. Chromium VI- USEPA Method 7196A 3. pH- USEPA Method 9040C/9045D 4. Volatile Organic Compounds (VOC)- USEPA Method 8260D 5. Semi-Volatile Organic Compounds (SVOC)- USEPA Method 8270E 6.Total Petroleum Hydrocarbons- USEPA Method 8015C and/or 8260D 7. Cyanide- USEPA Method 9010 or 9014 Once disposal options are identified,the septic tank(s) will be emptied and cleaned, and the contents transported by a licensed hauler to an appropriate disposal facility. Septic contents will not be disposed of at City of Stockton facilities. Blankinship&Associates, Inc. Page 12 of 20 September 23, 2022 NES, Inc.