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January21, 2026 Zachary Walton, Partner Proposal for Supplemental Environmental Support Services at 1010 Industrial Drive, Stockton, California Indoor and Outdoor Air Sampling Prior to collecting soil gas samples,three indoor,two outdoor, and one duplicate air sample will be collected at the AGI sample locations on Figure 3.The samples will be collected in accordance with the California Department of Toxic Substances Control (DTSC) and California Water Resources Control Boards Supplemental Guidance:Screening and Evaluating Vapor Intrusion dated February 20231 and SOP 300-23-00 "Indoor and Outdoor Air Sampling" included in Attachment C. Indoor and outdoor air samples will be collected in individually certified summa canisters and analyzed for VOCs using USEPA Method TO-15 SIM. Soil Gas Sampling New and previously installed soil gas probes will be sampled accordance with the Advisory—Active Soil Gas Investigations.2 A total of eight samples will be collected in batch-certified summa canisters, including one duplicate sample, and submitted to a California-certified analytical laboratory under chain- of-custody protocol for the following analyses: • VOCs using EPA Method TO-15; and • Helium (leak-detection compound) and fixed gases, including oxygen, nitrogen, carbon monoxide, carbon dioxide, and methane, using modified ASTM D-1946. Investigation-Derived Waste Soil generated from drilling activities and water generated from sampling, development, and decontamination activities will be containerized in drums and stored onsite in a location identified by the client, pending analysis. An up to 4-point composite sample will be collected from the solid (soil) investigation derived waste (IDW) drums and one 4-point composite sample will be collected from the liquid IDW drums. Each sample will be submitted to a state-certified laboratory under chain-of-custody protocols. IDW samples will be analyzed for the following: • Title 22 metals using USEPA Method 6010; • VOCs and total petroleum hydrocarbons (TPH) as gasoline (TPH-g) using USEPA Method 8260B; and • TPH as diesel (TPH-d) and motor oil (TPH-mo) using USEPA Method 8015 Modified. IDW drum(s)will be labeled and stored on-Site while being profiled with the appropriate landfill and will be collected for disposal within approximately 30 days. Disposal costs for six soil drums and two water drums are included.The soil and water are assumed to be non-hazardous. 1 California Department of Toxic Substances Control (DTSC) and California Water Resources Control Boards, Supplemental Guidance:Screening and Evaluating Vapor Intrusion, February 2023. Z California Environmental Protection Agency Department of Toxic Substances Control, Los Angeles RWQCB, and San Francisco RWQCB,Advisory—Active Soil Gas Investigations, 2015. \4 Page 4of7