COMPLIANCE INFO_JTD 9/3/2025 - Laserfiche WebLink

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Project No. AU25.1274 | PCPCMP Foothill Sanitary Landfill 6 September 2025 number showing good control of soil erosion. This value is less than the USEPA's maximum allowable soil loss of 2 tons per acre per year (Appendix B). 2.5 Environmental Monitoring Environmental monitoring systems in conformance with Title 27 at FSL include groundwater monitoring wells, landfill gas probes, and surface water monitoring points. 2.5.1 Groundwater Groundwater is monitored at seven groundwater monitoring wells. Monitoring wells include two upgradient wells MW-4 and MW-4A, two downgradient wells MW-5 and MW-6, and cross- gradient wells MW-1A, MW-2R, MW-3, MW-7 and MW-7R (see Figure 7). The supply well LW-1 is included as part of the monitoring and reporting program for the landfill. Groundwater is monitored semi-annually at all wells with the exception of MW-3, which is monitored quarterly beginning in 2015. As new modules are constructed, new groundwater monitoring wells will be added as determined by the Regional Water Quality Control Board, and interior wells such as MW-1 will be decommissioned. Proposed final groundwater monitoring includes three up-gradient wells (MW-4, -8, and -9) and three down-gradient wells (MW-5, -6, and -7) (Figure 7). Actual number and location of the groundwater monitoring wells at closure will be controlled by factors such as regulatory input, changing regulations, and future patterns of detections of constituents in groundwater, if any. For estimating closure and post-closure maintenance costs, it is assumed that these wells will be installed along with the adjacent modules, and will not be part of closure construction. Cost of maintenance is included in the Post-Closure Maintenance Cost. 2.5.2 Landfill Gas (LFG) Migration Monitoring and Control LFG migration is presently monitored at 25 landfill gas monitoring probes at FSL (SG -12 through SG-125, Figure 7). Well SG-12 will be replaced with the development of the landfill prior to closure. No additional perimeter migration monitoring wells will be needed at closure (Figure 7). Cost of maintenance and monitoring after closure is competed is included in the Post -Closure Maintenance Cost. 2.5.3 Landfill Gas Surface (LFG) Emissions LFG surface emissions will be controlled in accordance with the requirements of the air quality requirements in applicable at that time. Presently, the San Joaquin Valley Air Pollution Control District (SJVAPCD) and the Federal Environmental Protection Agency have jurisdiction over this activity. Present requirements for both agencies are incorporated into the Permit to Operate issued by the SJVAPCD (JTD Appendix A).