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Non-Water Release Corrective Action Plan North County Recycling Center and Sanitary Landfill AU24.1294.00 | Non-Water Release Corrective Action Plan Update 14 October 2024 5.0 ANTICIPATED METHODS OF MITIGATION 5.1 Mitigation of Seismically-Induced Impacts Seismically-induced impacts are not a reasonably foreseeable casual event; therefore, no mitigation is required. 5.2 Mitigation of Precipitation Related Impacts As discussed in Section 4.2, a review of the data from the 1,000-year, 24-hour storm indicates that the data has not changed since submittal of the 2014 NWRCAP. Therefore, the subsequent analyses and evaluation of the site drainage structures did not change from 2014. However, the costs for the repairs of the structures have increased due to increases in both labor and equipment costs. The cost estimate for the repairs, discussed at the end of this section, has been updated based on these increases. The capacity at seven downdrain locations is inadequate to convey run-off from the 1,000-year, 24-hour storm event and would cause the bench channels to back-up and overflow at the inlets, and is a reasonably foreseeable causal event for this facility. Although the benches have capacity to contain the additional run-off, the flows would likely cause localized erosion along the benches. It is assumed that the damage from runoff of the 1,000-year, 24-hour storm event would require reconstruction and reconditioning of the benches. For cost estimating purposes, it was assumed that rivulets along an area the width of the bench (12.5 feet not including the channel) and 50 feet in length would need repair to a depth of no more than 1 foot. The 2024 cost to excavate soil debris, reconstruct channel edges, replace vegetative cover soil, and place erosion control for these channels is estimated at $127,978 (see Table D-1, Appendix D). 5.3 Mitigation of Fire-Related Impacts As discussed in Section 4.3, a review of Cal Fire’s Fire Hazard Severity Zone map for San Joaquin County indicates that the data has not changed since submittal of the 2014 NWRCAP. Therefore, the conclusions regarding wildfires at the site did not change from 2014. However, the costs for the repairs of the landfill gas structures due to a subsurface fire have increased due to increases in both labor and equipment costs. The cost estimate for the repairs, discussed in Section 5.3.1, has been updated based on these increases. 5.3.1 Subsurface Fires As discussed in Section 4.3.1, subsurface fires are considered a potential casual event due to the landfill gas extraction system. Like all fires, subsurface landfill fires can be extinguished by removing one of the tetrahedral components (oxidizing agent, fuel, heat). This can be excavation and soil burial, injection of Type A foam, or by turning off the landfill gas system. The suppression method, however, is unique to each situation.