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3-10 3.0 CORRECTIVE ACTION PLAN COST ESTIMATES The FSL NWRCAP cost estimates are based on the reasonably foreseeable impacts due to the causal events discussed in the previous section. CalRecycle’s 2010 BMP and 2011 Technical Guidance Documents were used to assess the causal events and develop the corresponding corrective action cost estimates. The following landfill systems and features were evaluated for each corrective action scenario:  Final Cover System (includes cover soil layers, vegetation, and grading)  Landfill Gas Collection and Control System (GCCS)  Stormwater Management / Drainage System Features  Environmental Monitoring and Control Systems Results of the causal event evaluations, and corresponding corrective actions and costs are presented below in the following paragraphs. 3.1 Earthquake Causal Event An earthquake is a reasonably foreseeable causal event in California. The Uniform California Earthquake Rupture Forecast, Version 3 (UCERF3) is a comprehensive model of earthquake occurrence for California. UCERF3 represents the best available science for authoritative estimates of the magnitude, location, and likelihood of potentially damaging earthquakes in California. UCERF3 was developed by the 2014 Working Group on California Earthquake Probabilities (WGCEP), a multi-disciplinary collaboration of leading experts in seismology, geology, geodesy, paleoseismology, earthquake physics, and earthquake engineering. The 2014 WGCEP predicted that the greater California region has > 99% probability of a 6.7 magnitude earthquake occurring in the next 30 years. Earthquakes can cause damage to a landfill and associated structures due to ground motions, liquefaction, or fault rupture. Design standards are used to ensure that structures are designed to withstand the ground movement and shaking, resulting from a certain size earthquake taking into consideration the proximity and the geology between the location of the structure and faults. 3.1.1 Maximum Probable Earthquake vs. Maximum Credible Earthquake Pursuant to Title 27 CCR §20370, a Class III landfill must be designed to withstand the Maximum Probable Earthquake (MPE). In Title 27 CCR §20164, the MPE is defined as “the maximum earthquake that is likely to occur during a 100-year interval.” For a site-specific NWRCAP, CalRecycle recommends evaluating the impact on the landfill from the Maximum Credible Earthquake (CalRecycle 2011). A Maximum Credible Earthquake (MCE) is defined in Title 27 CCR §20164, as the “maximum earthquake that appears capable of occurring under the presently known geologic framework.” For purposes of compliance with Title 27 CCR §22101(b)(2), the MCE was used to prepare the FSL NWRCAP. 3.1.2 Maximum Credible Earthquake and Peak Ground Motion Determination A Seismic Characterization of the FSL site was performed to determine the MCE and resulting ground motions occurring at the FSL site (see Appendix A). A review of all faults located within 100 kilometers of