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AECOMimagine it. ❑elive ed. Pre-Mobilization Activities Permits SJCEHD maintains jurisdictional authority over well destructions in San Joaquin County.As such, prior to commencing field activities,AECOM will obtain the necessary well destruction permit from SJCEHD. Health and Safety Plan A site-specific Health and Safety Plan (HASP)will be completed to detail health and safety protocols for the well destruction activities at the Site.The HASP will meet the requirements of applicable federal, state, and local regulations. These requirements include: • Title 29, Code of Federal Regulations (CFR) Section 1910.120, • Title 29 CFR Section 1926, and • California Code of Regulations Title 8. The HASP addresses worker and nearby (off-site) personnel safety.All on-site workers must be 40-hour Hazardous Waste Operations and Emergency Response (HAZWOPER)-certified and must be current with the 8-hour annual HAZWOPER refresher course. Utility Clearance AECOM will mark the Site and notify Underground Service Alert of Northern California and Nevada (USA North 811) of the work a minimum of 48 hours in advance.AECOM will also utilize the services of a geophysical locator to identify underground utilities in the vicinity of each well location. Boring Logs and Well Construction Details Construction details for the 11 groundwater monitoring wells are summarized in Table 1 along with the most recent depth to groundwater measurements (AECOM 2020b). Drilling operation and well construction detail logs, as sourced from the well installation report (AECOM 2014), are provided in Appendix A. Implementation Activities Well Destruction Procedures The 11 Site groundwater monitoring wells will be destroyed by a licensed C-57 water-well drilling subcontractor by over-drilling in accordance with the standard operating procedures detailed in California Well Standards Bulletins 74-81 (California Department of Water Resources [DWR] 1981)and 74-90 (DWR 1991 and San Joaquin Well Standards (SJCEHD 2005). These standards are included in Appendices B and C. Prior to over-drilling, an AECOM field representative will measure and record the following at each well: 1. Total depth of the well, 2. Depth to water, and 3. Well diameter, Each well will also be cleaned, as needed, to remove all undesirable materials, including obstructions and debris that could interfere with well destruction. Procedures for cleaning out the well include observing the aecom.com Our Reference 60632236 2/6