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Non-Water Release Corrective Action Plan Corral Hollow Sanitary Landfill • Wells SB-1, MW-4, MW-5, and MW-8 monitor the shallow aquifer. Well SB-1 is an up gradient well, whereas wells MW-4 and MW-5 are down gradient. Piezometer (PZ-1), measures the shallow aquifer elevation. Wells MW-6 (down gradient) and MW-7 (up gradient) monitor the deep aquifer. 3.3 SURFACE WATER CONTROLS As described above, stormwater run-off from the landfill is controlled by a series of mid-slope benches and perimeter drainage channels that convey flow into two stormwater retention basins. These permanent stormwater run-off and drainage control facilities were designed to carry the peak discharge resulting from a 100-year, 24-hour storm event, as required by 27 CCR, Section 20320 for a Class III waste management unit. 4.0 REASONABLY FORESEEABLE NON-WATER IMPACTS The following scenarios of non-water impacts associated with known or reasonably foreseeable site damage scenarios have been developed in accordance with CalRecycle's BMPs for Preparing Site-Specific Non-Water Quality Corrective Action Plans (CalRecycle, 2010). • 4.1 SEISMICALLY-INDUCED IMPACTS Seismically-induced impacts are those that result from a large earthquake that occurs within a distance of engineering significance to the site, and could include one or a combination of the following: ground rupture, slope failure, dynamic settlement, liquefaction, seiche, or tsunami. In order to determine which, if any, of these seismically-induced phenomena could affect the CHSL, a site-specific seismic hazard assessment was conducted to identify faults within a 100- mile radius of the site to estimate the peak ground acceleration associated with the Maximum Credible Earthquake (MCE) as required by CalRecycle's BMPs. The site is in an active seismic area known as the California Coastal Ranges located along the western perimeter of the Central Valley of California. The site is essentially underlain by the Great Valley 7 Faults (Black Butte and San Joaquin Faults)(see Figure 3). Based on a deterministic approach, potential seismic events that could be produced by "Maximum Credible Earthquake" (MCE) events within the region are presented in Table 1. An MCE is defined as the largest anticipated magnitude earthquake the fault is capable of producing based on the known tectonic framework. A list of all known active faults with 100 • miles of the site is presented in Appendix A. 4 Geo-Logic ASSOCIATES