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Mr. Jeff Wong San Joaquin County Environmental Health Department May 8, 2023 Page 2 The site is currently surrounded by an ornamental iron security fence and the ground surface is covered by a combination of bare soil and old concrete/asphalt. The remnant of a fuel dispenser island is located along the northeast corner of the property, adjacent to the station building's foundation. The property is accessed by gates located along the northern and the eastern property lines. Project Background A summary of the Site's history and environmental assessment and remediation activities performed at the Site is included in Enclosure B. Proposed Well Destructions Scope of Work To complete closure of the CVRWQCB's leaking underground storage tank (UST) case, the CVRWQCB has requested proper destruction of the Site's remaining 16 monitoring and remediation wells (MW -1 through MW -8, MW -10, MW -11, MW -1B, MW -5B, MW -6B; air sparge well AS -1, and soil vapor extraction wells SVE-IA/B and SVE-2A/B. The locations of the wells are illustrated on Figure 2 and a summary of the well construction details are included on Table 1. Copies of the well construction logs for all the wells are included in Enclosure C. The wells will be destroyed in accordance with the State of California Department of Water Resources (DWR) Well Standards (Bulletins 74-81 and 74-90) and the San Joaquin County Well Standards. The proposed scope of work for the well destructions will consist of the following tasks: Underground Utility Location: USA North will be notified (811 or 800-227-2600) a minimum of 2 working days in advance of the drilling activities so that USA North's member subscribers can mark the locations of their utilities. In addition, RDM will also subcontract a private utility locator to search and identify utilities whose owners are not member subscribers of USA. RDM may require the driller to hand clear around any well whose destruction may pose a risk of damaging underground utilities. Hand clearing would be done to a depth of 5 feet below surface grade (fbgs) using either an air knife or hand auger to identify any potential subsurface utilities that may have been installed after the wells were installed. Site Health and Safety Plan: A site specific health and safety plan (SHSP) will be prepared by RDM. The SHSP will identify potential site hazards and appropriate personal protective equipment (PPE), provide emergency contact information and directions to nearest hospital or treatment facility. A copy will be maintained on-site during fieldwork. Right -of -Entry Agreements: The following monitoring wells are located off-site on the adjacent property and Huntbrook has an existing right -of -entry agreement for them: • MW -4 — 3200 East Main Street (APN 157-110-510-000) • MW -6 and MW -6B — 3139 East Main Street (APN 157-082-270-000) • MW -7 — 3130 East Main Street (APN 157-104-020-000) The off-site property owners will be notified a minimum of two weeks in advance of the proposed well destructions. Encroachment Permits: The following wells are in the City of Stockton right-of-way and will require an encroachment permit(s):