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Non-Water Release Corrective Action Plan <br /> Corral Hollow Sanitary Landfill <br /> • The longevity of a soil cover can be measured in the thousands of years. <br /> The longevity of a properly protected LLDPE membrane ranges from 200 to 750 years <br /> (EnviroCon Systems (2013), I-CORP International, 2010, Koerner, et.al., 2011, Malusis, 2010, <br /> and Hsuan, et.al., 1998). <br /> The post-closure maintenance plan discusses and has funding to provide maintenance activities <br /> such as liner repairs, erosion rills in the cover, cover sags, etc. Therefore, the long-term <br /> performance of the final cover is adequate for the life of the closure and no further assessment <br /> needs to be considered in this NWRCAP. <br /> 5.0 ANTICIPATED METHODS OF MITIGATION <br /> 5.1 MITIGATION OF SEISMICALLY-INDUCED IMPACTS <br /> Seismically-induced impacts are not reasonably foreseeable; therefore, no mitigation is <br /> required. <br /> • 5.2 MITIGATION OF PRECIPITATION RELATED IMPACTS <br /> As discussed in Section 4.2, channel capacity is in adequate to convey the 1,000-year, 24-hour <br /> storm event runoff in 4 of the 5 main bench and perimeter channels. Although the overflow <br /> would be contained within the bench and/or adjacent areas, excess flow would cause erosion in <br /> these areas. It is assumed that the damage from runoff of the 1,000-year, 24-hour storm event <br /> would require reconstruction and reconditioning of the benches and adjacent channel areas. <br /> For cost estimating purposes, it was assumed that a 2-foot wide, 1-foot deep gully would be <br /> eroded along the length of the channels. <br /> The cost to excavate soil debris, reconstruct channel edges, replace vegetative cover soil, and <br /> place erosion control for these channels is estimated at $109,192 (see Table F-1, Appendix F). <br /> 5.3 MITIGATION OF FIRE-RELATED IMPACTS <br /> 5.3.1 Subsurface Fires <br /> As discussed in Section 4.3.1, subsurface fires are considered a potential casual event due to <br /> the landfill gas extraction system. Like all fires, subsurface landfill fires can be extinguished <br /> similar by removing one of the tetrahedral components (oxidizing agent, fuel, heat). This can <br /> • be excavation and soil burial, injection of Type A foam, or by turning off the landfill gas system. <br /> The suppression method, however, is unique to each situation. <br /> 16 Geo-Logic <br /> ASSOCIATES <br />