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Rev.0,4/22/11 Project 110219 continental sediments derived from the Sierra Nevada were deposited in the valley with several alluvial and debris flow units overlapping the older crystalline and metamorphic bedrock units of the Sierra Nevada. Quaternary alluvial deposits of the Modesto Formation (Qm) and the slightly older Riverbank Formation (Qr) are primarily located north and west of the site and are typically found adjacent to Mormon Slough. Two geologic formations are mapped at the landfill and adjacent land surrounding the landfill. These formations consist of the Tertiary Laguna Formation (Tl) and the Tertiary Mehrten Formation (Tm). The Mehrten is mapped throughout the landfill property, with the exception of the northeast corner mapped as Laguna(JTD Figure 11 in Appendix C). Site soil consists of silty sand, clayey silt, and silty clay to approximately 10 feet bgs. These lithologic units are typically underlain by cemented sandy silt to approximately 30 feet bgs. These units correlate with the mapped Mehrten and Laguna Formations. The assessment of site geology is based on boring logs at various locations on the facility. 3.5 Seismicity A vicinity fault map is provided in Appendix C (JTD Figure 13). Five nearby faults (Central Valley Coast Range, Greenville, Calaveras, Hayward, and San Andreas) were used in the seismicity study that estimated ground motions at the landfill. The maximum probable earthquake MPE magnitudes for the five faults ranged from 6.3 (Greenville) to 8.0 (San Andreas). Peak ground acceleration based on the five nearby faults ranged from 0.027 g to 0.054 g. 3.6 Air Quality San Joaquin County is located within the San Joaquin County Valley Air Basin (SJVAB). The SJVAB is defined by the Sierra Nevada Mountains in the east, the Coast Range in the west, and the Tehachapi Mountains in the south. The valley opens to the sea in the north at the Carquinez Straits via San Francisco Bay. The region's topographic features restrict air movement throughout the basin, resulting in weak air flow which becomes stagnant when high barometric pressure forms over the region. The SJVAB is highly susceptible to pollution accumulation over time. Stagnation effects are more pronounced in the southern portion of the valley, but the Stockton area also experiences prolonged periods of restricted atmospheric dispersion. Because of the poor ambient air quality, FSL has been active in preventing further degradation of air quality at the landfill site by implementing monitoring and control programs for landfill gas, dust, and odors. In addition, FSL complies with Federal, State and local regulations. The SJVAPCD has jurisdictions over air quality matters in the SJVAB. Ameresco has submitted an application for an Authority to Construct with the SJVACD in August 2010 and submitted an "Addendum to Authority to Construct/Title V Application (No. N-1103269), Landfill Gas-to-Energy Facility, Foothill Landfill, Linden, California" on October 18, 2010 lowering the facility emission levels XAPROJECMAMERESCOA 10219-FOOTHILL LFGTE FACTUM ENGINEF.RING\San Joaquin County Site App-1 ApplicationTooM LFGTE-Project Description(final 4-22-11).doc CORNERSTONE 3-3 LEWIS ENGINEERING E—i.on mental G—p,LLC