COMPLIANCE INFO_2024 Q1 WATER QUALITY RPT

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Water Quality Monitoring Report First Quarter 2024 www.arcadis.com Forward Landfill 1Q24 Water Quality Mon Report_05012024 8 The Forward Unit leachate pond and the compost area retention basin were monitored on February 1, 2024; the Austin Road Unit holding areas were monitored on January 24, 2024. The field and laboratory monitoring results for first quarter 2024 are presented in Tables 10 and 11. Leachate samples from the holding areas of the Forward and Austin Road Units are also analyzed semiannually for dissolved inorganic compounds and metals, as required by the Water Code Section 13267 Order for Technical Reports Regarding Acceptance of Hazardous Waste, Forward Landfill, San Joaquin County, dated May 16, 2017 (RWQCB 2017; see Section 2.11). The semiannual laboratory analyses are scheduled for the second and fourth quarters of the calendar year. In addition, leachate samples are collected annually from the Forward Unit basin, the compost area retention basins, and the Austin Road Unit holding areas for laboratory analyses of general chemistry and VOCs (Table 1). 2.3.2 Seep Monitoring The Forward and Austin Road Units are inspected for surface seeps weekly. The sampling and reporting requirements following a seep observation are outlined in the MRP (RWQCB 2014). No surface seeps were observed at the Forward Landfill during first quarter 2024; therefore, no seep samples were collected. 2.3.3 Leachate Collection and Removal System Testing The LCRSs at the Forward and Austin Road Units are tested annually. In addition, an annual inspection of each sump is performed by Del-Tech, which most recently occurred on September 20, 2023. The LCRS at the Forward Unit was tested on September 13 and 14, 2023 at the Class II leachate impoundment, waste management unit (WMU) F-North, and passed, indicating that a conduit exists across the LCRS unit. The LCRS continuity test consists of injecting a high concentration tracer dye into the far side of the LCRS and allowing the liquids to migrate through the unit to settle in the low point of the LCRS sump. The nontoxic tracer dye liquids allow migration to the lowest point of the sump. Once the tracer dye has migrated through the system, it can be extracted and detected from the sump extraction pipe, indicating that a conduit is present through the unit. If excessive liquid is backed up into the drainage layer of the LCRS, the tracer dye will take longer to migrate to the sump. Testing of the LCRS at the Austin Road Unit has been postponed pending approval of the WMU F-West Pond reconstruction, which was completed on September 11, 2023. 2.4 Surface Water Monitoring Two creeks are present near the Site (Figure 2). The north fork of Littlejohns Creek borders the north and west sides of the Austin Road Unit. The south fork of Littlejohns Creek borders the south side of the landfill area at the Forward Unit. Both creeks are dammed upstream by the Farmington Dam and usually are dry. Surface runoff from the landfill areas is channeled to sedimentation basins, which are located near the southwestern corners of the Forward and Austin Road Units, adjacent to the creeks. The water in the sedimentation basins is typically evaporated.