COMPLIANCE INFO_JTD 9/3/2025 - Laserfiche WebLink

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Project No. AU25.1274 | PCPCMP Foothill Sanitary Landfill 8 September 2025 placement of the final cover can be held in an onsite tank and then transp orted off site to an acceptable disposal site such as a wastewater treatment plant. 2.5.6 Surface Water Surface water runoff sampling will occur upstream and downstream of the creek flowing along the eastern property boundary (Figure 7). 2.5.7 Storm Water Storm water will be sampled where the water leaves the property to the west and east (Figure 7). There are currently two surface water monitoring points at the landfill, S-1 and S-2 (Figure 7). These will be supplemented with additional points as required. 2.6 Closure Cost Estimate Closure costs for FSL have been developed per the regulations provided in CCR Title 27 Section 21815. The closure construction costs are estimated to be approximately $41.2 million (2025 dollars) (Appendix C Table C-1). This cost includes all surfaces yet to be closed, and excludes the closed top deck of Module "I". Note that the FSL site setting is relatively aseismic as indicated in the seismic characterization (JTD Appendix F). The calculated PGA of 0.054g is unlikely to cause damage at the site and therefore no assessment of seismically-related damage has been performed. 3.0 POST-CLOSURE MAINTENANCE 3.1 Post-Closure Land Use After closure of the landfill, the entire facility will become undeveloped, unirrigated open space. No post closure use of the landfill surface is currently envisioned that would involve large -scale use of the landfill surface. It is anticipated that electrical energy will continue to be produced after closure. It is also anticipated that the surface of the landfill will be grazed by sheep or other animal to control vegetation. The LFG flare or electrical generation equipment is tentatively located at the north -west corner of the landfill (Figure 5); however, the County may elect to install such equipment on the landfill closure surface to avoid constraints in surface area available to the LFG-to-energy system. The County will submit design of this facility, including foundation and subsurface barriers in compliance with the regulations in force at that time, to the appropriate regulatory agencies for approval prior to construction. 3.2 Post-Closure Maintenance Post closure maintenance must be provided for at least 30 years after closure. Responsibility for post closure maintenance will fall on several groups of individuals who will have different duties and responsibilities during post closure.