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January 23, 2026 Page 2 At each boring location, a Roux geologist, engineer, or scientist will continuously log soil using the Unified Soil Classification System (USCS) under the oversight of a California Professional Geologist or Engineer. Additionally, soils will be screened with a photoionization detector(PID)and readings will be recorded on boring logs. The grab groundwater samples will be collected where water is encountered using either a peristaltic pump, or a bailer, as necessary. The collected grab-groundwater samples will be sealed, labeled, logged on a chain of custody form, placed on ice, and transported to a California-certified laboratory for analysis of the following, on standard turnaround time (TAT): • Volatile organic compounds (VOCs) by U.S. Environmental Protect Agency (EPA) Method 826013; • Total petroleum hydrocarbons as gasoline (TPH-g), and TPH as diesel and motor oil (TPH- d/-mo) by EPA Method 8015/8015B; and • Polycyclic aromatic hydrocarbons (PAHs) by EPA Method 8270C (or equivalent). After groundwater sampling activities are complete, the two borings will be backfilled with neat cement grout placed from the bottom of the borehole to ground surface using a tremie pipe. DISPOSAL METHODS Investigation derived waste from the drilling activities will be temporarily stored in properly labelled 55-gallon drums. Investigation derived waste samples will be collected from the drums for waste profiling, and will be analyzed for the following: • VOCs and TPH-g by EPA Method 826013; • TPH-d,-mo by EPA Method 8015M; and • California Assessment Manual (CAM) 17 Metals by EPA Method 6010 (or equivalent). Following waste profiling, the waste will be transported to an appropriate disposal facility by a licensed transporter in accordance with state and federal regulations. Attachment Attachment A. Site-Specific Health and Safety Plan Figures Figure 1. Site Location Map Figure 2. Site Plan ROUX I Memorandum 5175.000151011MR