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1/5 Mr. Brad Shelton Central Valley Regional Water Quality Control Board 11020 Sun Center Drive, Suite 200 Rancho Cordova, CA 95670 URS 2020 L Street, Suite 400 Sacramento, CA 95811 February 18, 2022 Wastewater Treatment Plant Groundwater Monitoring Well Decommissioning Work Plan Deuel Vocational Institute 23500 Kasson Road, Tracy, San Joaquin County, California Dear Mr. Shelton: URS, on behalf of the California Department of Corrections and Rehabilitation (CDCR), is submitting this Wastewater Treatment Plant Groundwater Monitoring Well Decommissioning Work Plan (work plan) for the Deuel Vocational Institute located at 23500 Kasson Road in Tracy, San Joaquin County, California referred to as the “Site” (Figure 1). This work plan proposes abandonment of eight (8) groundwater monitoring wells in accordance with Amendment 50 of Agreement 560003303. Over-drilling and backfilling with a cement-bentonite slurry is the proposed abandonment method for groundwater monitoring wells MW-1 through MW-7, and MW-1R. Summary of Site and Surrounding Land Usage The site is located to the east of interstate 5 within San Joaquin county. A Union Pacific Railroad track runs along the northwest boundary of the DVI property. The site is bounded by south Kasson Road to the west, West Lorenzen Road to the south, and agricultural fields to the north and east as shown on Figure 1. The site is a former State of California correctional facility that is now operated in a warm shut down phase without inmates present and minimal support staff. The Site includes an existing groundwater treatment plant that consists of a reverse osmosis system, a brine concentrator, and four inactive surface impoundments. The Plant currently treats extracted groundwater from four groundwater supply wells located at the Site. The monitoring well network and individual well locations are shown on Figure 1. Background The groundwater treatment plant and four (4) Class II Surface Impoundments are located south of the former inmate housing facility (Figure 1). The Class II surface impoundments P-1 through P-4 located at DVI are owned and operated by CDCR. The Class II surface impoundments are regulated under Waste Discharge Requirements (WDRs) Order R5-2017-0071 in accordance with state regulations (California Code of Regulations (CCR) Title 27 (tit. 27, § 20005 et seq). In 2007, three groundwater monitoring wells (MW-1, MW-2, and MW-3) were installed to monitor groundwater around the perimeter. In 2016, two additional groundwater monitoring wells, MW-1R and MW-4 were installed to further monitor the surrounding groundwater. Two downgradient monitoring wells (MW-5 and MW-6) and an upgradient monitoring well (MW-7) were installed on July 17, 2017 and December 7, 2019, respectively. Well construction details are summarized in Table 1. WDRs Order R5-2017-0071 was adopted by the Central Valley Regional Water Quality Control Board (CVWB) on 9 June 2017. The WDRs in Provisions H.13.D and H.13.E required CDCR to clean close Class II surface impoundments P-1 through P-4, including monitoring well abandonment/destruction.