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Stockton Propeller Sampling and Analysis Plan Working with a driller with current California C-57 license, a California professional geologist or someone under their direct supervision will supervise advancement of up to nine (9) borings and log subsurface material according to the United Soil Classification System (USCS) at five (5) foot intervals. Borings will be placed as shown in Figure S. For the five soil borings adjacent to the septic tank, soil samples will be collected starting at the bottom depth of the septic tank at 5-foot intervals until 15 feet below the bottom of the septic tank. Sampling may be adjusted based on soil type and field observations. For the four soil borings in the vicinity of the leach field, soil samples will be collected starting at the depth of the leach field lines at a minimum of 5-foot intervals down to the same depth as the soil borings adjacent to the septic tank. Sampling may be adjusted based on soil type and field observations. During the advancement of the borings, soil samples for lithologic evaluation and chemical analyses will be collected at 5-foot intervals using a California modified split spoon sampler equipped with three 6- inch sample sleeves.The ends of the bottom-most intact sleeve from each sample interval will be lined with Teflon sheets and capped. No less than five (5) soil samples from each boring will be submitted for chemical analysis. Downhole equipment will be decontaminated between sample locations by either pressure washing or steam cleaning.As necessary, hand washing will be done with a non-phosphate cleaning solution. Cleaned equipment will be triple rinsed with clean water prior to reuse. Site personnel will be made aware of the potential presence of human waste in soil and groundwater and will wear appropriate PPE. Investigation-derived waste (IDW) such as drill cuttings, decontamination water, etc. will be placed in DOT-approved 55-gallon drums and placed on-site pending soil characterization and will then be disposed of properly. In addition to the sample collection criteria described above, a photoionization detector(PID) or similar device will be used in the field and will combined with visual observations to aid in selecting samples for laboratory analysis. Samples from each boring will be placed in appropriate containers and transported to an ELAP-certified analytical laboratory under COC procedures in iced coolers and analyzed for the analytes described below.The first 3 soil samples collected from each boring will be analyzed and if analytes are detected, deeper samples will be analyzed. Conversely, if analysis of 3 contiguous samples reports non-detect,then deeper samples may not be analyzed. Samples will be analyzed for the following: 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 The GPS coordinates of each boring and monitoring well location will be recorded and will be reported along with analytical laboratory results in electronic deliverable format (EDF)to GeoTracker. Blankinship&Associates, Inc. Page 14 of 20 September 23, 2022 NES, Inc.