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No i -I- ■ r, or—* �T INTRODUCTION On behalf of Ms. Linda Wilson of the Ray Farmer and Bess Farmer Community Property Trust, ATC Group Services LLC (ATC) doing business as Atlas Technical (Atlas) is submitting this well destruction workplan describing proposed activities and methodology for the destruction of groundwater monitoring and remediation wells associated with subject site located at 610 North Hunter Street, Stockton, California (Figures 1 and 2). In correspondence dated May 5,2025,the Central Valley Regional Water Quality Control Board (RWQCB) indicated the site is ready for case closure and directed proper destruction of the remaining remediation and monitoring wells (Attachment 1). This workplan was prepared as a requirement to apply for a Well Destruction Permit with the San Joaquin County Environmental Health Department (SJCEHD).The scope of work is described in detail below. SITE BACKGROUND The site is located on the north side of Oak Street and the east side North Hunter Street in Stockton, California (Figure 1). The location is a residential and commercial area. The western portion of site was formerly the occupied by Toyota Town and more recently utilized as a church and ministry center. The site is currently unoccupied. The eastern portion of the site is utilized as a parking area. PREVIOUS ASSESSMENTS On October 6, 1987,Al Williamson,General Contractor, removed three underground storage tanks(USTs) from the site;two of the USTs were 1,000-gallon capacity used to store leaded gasoline and the third UST had a 550-gallon capacity and was used to store waste oil. Soil samples collected after the tank removals contained elevated concentrations of petroleum hydrocarbons and volatile organic compounds (VOCs). On January 21, 1988, Falcon Energy, attempted to remove contaminated soil by over- excavating soil in the vicinity of the former UST locations. The former tank locations were excavated to approximately 22 feet below ground surface (bgs) and were limited to the north by the on-site building. The confirmation samples collected from the base of the over-excavation still contained elevated concentrations of VOCs. The excavated soil was transported to the Forward Landfill near Stockton, California for disposal. On June 30 and July 1, 1997, Smith Technology personnel supervised the advancement of seven soil borings (SB1 through S137) to evaluate the lateral and vertical extent of impacted soil and groundwater beneath the site. Three of the soil borings were completed as groundwater monitoring wells (MW1 through MW3) and two of the soil borings were completed as vapor extraction wells (VW1 and VW2). On March 24 and 25, 1998,ATC personnel supervised the advancement of seven soil borings,(ASB1,MW4, MW5, MW6, MW7, SB8, and SB9) at the site to depths ranging from approximately 26.5 to 62 feet bgs. These borings were advanced to: 1)evaluate the horizontal and vertical extent of petroleum hydrocarbon impacted soil and groundwater; 2) evaluate and refine soil stratigraphy; and 3) install groundwater monitoring wells (MW4, MW5, MW6, and MW7)within the uppermost aquifer. In November 1999, ATC personnel supervised the advancement of three soil borings, S139A, SB10, and S1311. Borings SB10 and SB11 were advanced to 46 feet bgs using hollow stem auger drilling methods and S139A was advanced to 65 feet bgs using continuous core methods. 1 1 P a g e