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Site Health and Safety Plan ENSAFE RS&H Stockton Metropolitan Airport, Stockton, California January 27, 2020 2.0 SITE DESCRIPTION AND HISTORY The associated scope of work includes per- and polyfluoroalkyl substance (PFAS) sampling support to RS&H, Inc. for work at the Stockton Metropolitan Airport (SCK, Attachment A). Soil and groundwater sampling are required to determine potential environmental impacts to Taxiway D fill material associated with the historical use of long-chain PFAS in aqueous firefighting foams. EnSafe will provide field services, laboratory coordination, data management, and data validation for PFAS sampling activities at SCK. 3.0 SCOPE OF WORK The scope of work for the environmental restoration project is described below: UTILITY CLEARANCE The EnSafe FTL or project manager will coordinate with the SCK POC to initiate the utility clearance process for all intrusive sampling locations and will mobilize to the site to mark selected sampling locations. At least 3 days prior to the commencement of subsurface intrusive activities, EnSafe will contact California USA North 811 to complete a utility clearance ticket for the areas under investigation. Investigations will be initiated within 10 days of the completion of the public utility mark-outs. Additionally, the EnSafe FTL will request utility clearances from the onsite facilities services coordinator at SCK, with the same information provided to the utility locator along with maps/figures showing the areas of interest as provided by RS&H in the Work Plan. Utility clearance activities will be conducted in accordance with EnSafe's Utility Clearance Standard Operating Procedure. Additionally, a private geophysical contractor will perform a more in-depth survey at proposed soil boring locations to determine if the locations are free of underground structures. The geophysical contractor will also conduct a survey of former site features to determine if the features and associated appurtenant piping remain in place. The private geophysical contractor will use ground penetrating radar, electronic utility-locating equipment, and other utility locator technologies as necessary. SAMPLE COLLECTION TASKS Subsurface Soil Sampling Ten direct-push technology (DPT) borings will be performed in accordance with the Work Plan by a California C57-licensed driller at the locations indicated in Appendix A. The final locations of the 8