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Ms.Amber Ginorio,RWQCB January 30,2023 Addendum to Sampling and Analysis Plan 2478 Wilcox Road,Stockton,California Page 9 retained where changes to sediments occur, or stratigraphic contacts are identified. The ends of the sample will be lined with Teflon sheets, capped, labeled,placed in a re-sealable plastic bag, and stored in an ice-chilled cooler. Strict chain-of-custody procedures will be followed from the time the samples are collected until the time the samples are relinquished to CLS. Stratus will submit one soil sample from approximately one foot below the total depth the air knife advances,as well as select soil samples(e.g. high PID readings and from contacts between fine- and coarse-grained sediments), for laboratory analysis. The exact number of samples submitted for laboratory testing will be determined at the time of the investigation. All sampling equipment will be cleaned in an aqueous non-phosphate solution cleanser, rinsed with tap water, and rinsed a second time with deionized water to prevent cross- contamination between sample intervals. Task 2F: Groundwater Monitoring Well Development and Sampling A minimum of 72 hours following installation, Stratus will develop wells MW-1 through MW-3 (and MW-4,if installed)by surging and bailing,followed by groundwater pumping. Approximately 10 well casing volumes will be removed from each well during development; however, removal of groundwater will continue until the water appears free of suspended sediment (see Appendix A). A minimum of 24 hours after the groundwater monitoring wells are developed, the monitoring wells will be purged using low-flow methods. During purging Stratus will record water quality parameters such as dissolved oxygen, temperature, conductivity, pH, and turbidity. Subsequent to purging activities, groundwater samples will be collected. The samples will be collected using a disposable bailer, transferred to laboratory-supplied glass vials, and placed in an ice-chilled cooler. The groundwater samples will be transported under strict chain-of-custody protocol to CLS for analysis (see Appendix B). Task 2G: Well Surveying A California-licensed land surveyor will be retained to survey site features and the elevations and locations of wells MW-1 through MW-3, and MW-4 if installed. The elevations of the top of well casings will be surveyed to a 0.01-foot vertical accuracy. The data will be uploaded to GeoTracker. Task 2H: Waste Management Drill cuttings and wastewater generated during the drilling and well development activities will be contained in DOT-approved 55-gallon steel drums. The drums will be appropriately labeled and stored at the Site pending proper disposal. A licensed contractor will transport the soil and wastewater to an appropriate facility(based on analytical results) for disposal. T:\Stockton Propeller\Addendum to SAP\SM_Addendum to Sampling and Analysis Plan.docx STRATUS