COMPLIANCE INFO_EW-5 INSTALL PERMIT PACKAGE 2/14/25

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WELL INSTALLATION AND INTERIM REMEDIAL ACTION REPORT www.arcadis.com FINAL_Forward CHCF (CDCR) Well Installation Report_10182024 2 thickness of high-permeability materials in the intermediate zone. Installation of an extraction well at this location would provide a groundwater extraction well with higher production capacity and anticipated improved plume control capability. The RWQCB approved the relocation of extraction well CDCR-EW-3 and the addition of a monitoring well pair (AMW-61S/AMW-61M) screened in the shallow and intermediate WBZs in emails dated May 22 and June 21, 2024 (RWQCB 2024a, 2024b), respectively. Groundwater monitoring wells AMW-61S and AMW-61M served as the closest observation wells during hydraulic testing of extraction well CDCR-EW-3. This Report also discusses the installation of extraction well CDCR-EW-4 which was installed adjacent to monitoring wells AMW-58S and AMW-58M, which acted as the closest monitoring wells during the hydraulic testing of extraction well CDCR-EW-4. In summary the four groundwater monitoring wells (AMW-60S, AMW-60M, AMW-61S, and AMW-61M) were installed to monitor and define the shallow and intermediate plume extent beneath the CDCR property and for hydraulic testing, and the two extraction wells (CDCR-EW-3 and CDCR-EW-4) were installed to extract plume mass from beneath the CDCR property. The incorporation of the extraction wells and details of the proposed remedial groundwater extraction and treatment (GWET) system is discussed in Section 6. 2.2 Site Description Forward Landfill is an approximately 567-acre, privately owned, waste disposal and resource recovery facility. The facility consists of a transfer station, materials recovery facility, and composting facility. The landfill owner and operator (Forward) also owns an adjacent 184-acre parcel, known as the “Brocchini” parcel, which is within the overall facility boundary but not permitted for solid waste handling activities. Therefore, the total acreage owned by Forward is 751 acres. The Forward Landfill is located 7 miles southeast of the City of Stockton in San Joaquin County, California. The approximately 567-acre permitted Forward Landfill is a combination of the City of Stockton’s former 410-acre Austin Road Sanitary Landfill (now the northern portion of the Forward Landfill) and the 157-acre original Forward Landfill (now the southern portion of the Forward Landfill). The original Forward Landfill was permitted in 1973 and converted to a Class II landfill in 1993. Forward Landfill is bounded predominantly by agricultural property to the east, west, and south (Figure 1). The CDCR property is located approximately 1,500 feet to the north of Forward Landfill. Domestic residences and agricultural properties are located along Newcastle Road (to the west of the CDCR property) and Austin Road (to the east of the CDCR property). A domestic residence at 7833 Newcastle Road is located approximately 3,300 feet northwest of Forward Landfill. Both 7833 Newcastle Road and the CDCR property are indicated to be offsite VOC sources separate from Forward Landfill.