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North County Recycling Center & Sanitary Landfill Department of Public Works/Solid Waste First Semiannual 2025 Groundwater Monitoring Report ©2025 COUNTY of San Joaquin. All Rights Reserved 4 In September 2017, monitoring well G-9 was drilled and installed as a new downgradient monitoring well. In October 2017, the Regional Board issued a Notice of Violation to North County Landfill due to an inadequate monitoring network and release of waste outside the landfill unit. For the first violation, per the NOV, only two (2) monitoring wells could be sampled during the first semiannual 2017 monitoring period due to declining water levels across the region. The NOV directed North County Landfill to reconstruct monitoring wells G-3D, G-6 and background monitoring well G-1A. For the second violation, elevated methane was detected at gas probe SG-6 and had an increase in concentration over first semiannual 2015 monitoring results, indicating that the LFG extraction system was not controlling LFG. SG-6 is an interior monitoring point and not part of the regulated perimeter monitoring network. The NOV directed North County Landfill to assess and increase the corrective action measures around Module M1/M3 and enhance the LFG extraction system. The County responded in December 2017 to the NOV and committed to reconstructing monitoring wells G-1A, G-3D, and G-6, and enhancing the LFG extractions efforts. However, it was noted that due to budget restrictions, well installation would be delayed until the following fiscal year. A continuing NOV and Rejection to Response to NOV letter was sent by the Board on January 8, 2018. The Board reiterated the non-compliance with the WDRs for the groundwater monitoring network and stated that until a groundwater monitoring network has been installed and accepted as compliant, the Discharger could not place waste in Area 5B. Upon receipt of the January 8, 2018 notification, the County prepared and submitted a work plan for the installation of three new monitoring wells, G-5B, G-10, and G-11. On March 6, 2018, the Board approved the monitoring well installation work plan and stated that upon approval of the monitoring well network, the Discharger could resume waste placement in Area 5B. Monitoring wells G-5B, G-10, and G-11 were installed in February and March 2018. Regional Board approval of the monitoring network was received on April 3, 2018 and waste placement resumed in Area 5B on April 17, 2018. On August 4, 2021, the County received a Review of Second Semi-Annual and Annual 2020 Groundwater and Surface Water Monitoring Report, and Site Inspection Report for the North County Sanitary Landfill letter from the Regional Board. As part of the letter, the Regional Board requested reevaluation of the Detection Monitoring Program (DMP) at the facility due to changes in groundwater flow direction. As part of the evaluation, the Regional Board required assessment of background and detection monitoring wells to establish updated concentration limits. The Regional Board also required the addition of one groundwater monitoring well to be installed along the eastern boundary of Module 5 to serve as a point of compliance well. A Work Plan for Groundwater Monitoring Well (G-12), a Work Plan for LFG System Expansion, and a cover letter were submitted to the Regional Board on September 13, 2021, to respond to elements required in the August 4, 2021 letter. Regional Board’s review of the submittals was received via email on September 21, 2021, and required preparation of a DMP evaluation to assess monitoring wells G-5B, G-9, or G-11 for use as a background well and to propose a point of compliance well for Module 5 based on groundwater flow direction since 2019.