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1.0 Introduction <br /> The Corral Hollow Landfill (Landfill) is a closed Class III landfill located in Northern California <br /> on the eastern edge of the Central Valley (37.6691 N, -121.4590 V). The Landfill is located <br /> approximately 5 miles southwest of Tracy, California on the eastern margin of the Diablo Range <br /> Mountains. The site is noted as being located in close proximity to several faults associated with <br /> the Coast Range system of faults in California. <br /> ' 2.0 Method of Maximum Probable Earthquake (MPE) Development <br /> California Code of Regulations (CCR) Title 27 requires that Class III landfills be designed with <br /> consideration to the maximum probable earthquake (MPE). The MPE, as defined in the Title 27 <br /> literature (section 20164), is the earthquake that is likely to occur in the next 100 years, but is not <br /> less than the largest historical earthquake affecting the site being considered. In order to <br /> determine the MPE for the Corral Hollow Landfill it was decided that an event with at least a <br /> 30% chance of occurring within the 100 year time period is an event that is "likely to occur," <br /> which is consistent with state of practice at this time, and as was done by Dr. Norman <br /> Abrahamson, an expert in seismic site characterization, when he characterized the Fink Road <br /> Landfill No. 2, Cell #5 (Golder Associates, 2008) located in Stanislaus County, California. To <br /> determine what magnitude event is "likely to occur," the United States Geological Survey <br /> (USGS) 2009 Earthquake Probability Mapping tool (EPMt) was used. Based on information <br /> obtained from the EPMt, it was determined that there was a 30% chance of up to a 7.5 moment <br /> ' magnitude (M) earthquake occurring within 100 km of the project site in the next 100 years <br /> (Reference Figure 2 for Cumulative Probabilities obtained from the EPMt). Because the EPMt <br /> does not specify which fault this event may occur on, every significant fault/fault zone within <br /> ' 100 km was analyzed for ground motions at the subject site based on its maximum magnitude up <br /> to a cut off of M= 7.5. <br /> Table 1 summarizes the major faults that will govern the MPE ground motions. <br /> N.iCommerciaMctive PmjecislSan Joaquin County1143515-2011.2012 ContractlComal Hollow LREngineedoMSlope AnatysislSeismic ln/ormationlConal Hollow Seismic WnteUp.docx <br />