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Foothill Sanitary Landfill – Seismic Characterization 1 03.18.2015 1.0 In t r o d u c t i o n The Foothill Sanitary Landfill (Landfill) is a Class III landfill located in San Joaquin County, approximately 8 miles east of Linden, California. The Landfill site is located in Northern California on the east edge of the central valley in the Sierran Block. The Sierran Block is a region with relatively low seismic activity in California, bounded by the Foothills faults on the east and by the Coast Range faults on the west (Abrahamson, 2002). This seismic characterization is being performed as part of the 2015 Non-Water Release Corrective Action Plans. This analysis utilizes and updates the information contained in the 2002 and 2012 Seismic Characterization Reports (Abrahamson, 2002, and Shaw, 2012) — specifically to determine the ground motions response at the Landfill site due to the maximum credible earthquake. Title 27 of the California Code of Regulations (CCR) defines the maximum credible earthquake as follows: "Maximum credible earthquake", or "MCE" (SWRCB), means the maximum earthquake that appears capable of occurring under the presently known geologic framework. In determining the maximum credible earthquake, little regard is given to its probability of occurrence except that its likelihood of occurring is great enough to be of concern. The term describes an event that could be approached more frequently in one geologic environment than in another; therefore, the following factors have a bearing upon the derivation of the MCE for any given facility: (a) the seismic history of the vicinity and of the geologic province; (b) the length of the significant fault or faults which can affect the site within a radius of 62 miles (100 kilometers) of the facility boundary; (c) the type(s) of faults involved; (d) the tectonic and/or structural history; and (e) the tectonic and/or structural pattern or regional setting (geologic framework); nevertheless (f) the time factor shall not be a parameter. 2.0 Met h o d o f A n al y s i s To conduct this analysis, the two previous seismic characterization reports (Abrahamson, 2002, and Shaw, 2012) were reviewed and the results were evaluated using current available information. Specifically, a search of faults / fault zones located within 150 kilometers of the Landfill site was conducted to determine: If any new faults / fault zones have been added since the last analysis was conducted; If any of the data / parameters for the previously evaluated faults had changed; and What faults / fault zones were going to impact the site. A spatial query was run on the United States Geological Survey (USGS) 2008 and 2014 National Seismic Hazard Map - Fault Source Parameters websites to find active Holocene faults within 150 kilometers (km) of the Landfill site. The USGS query results are included in Attachment 1. The California Department of Transportation (Caltrans) ARS Online (version 2.3.06) website,