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Chapter 3 ENVIRONMENTAL ISSUES This chapter addresses those environmental issues associated with the project, provides an environmental setting and analysis sufficient to establish an environmental baseline, and proposes mitigation measures to avoid or reduce to insignificance the potential environmental impacts. A. Seismic Setting The NCRCSL site is located within Seismic Zone 3 , the second most stringent classification for earthquake design under the Uniform Building Code (UBC) . The nearest known faults are the Bear Mountain and Melones Fault Zones located within the Sierra Foothills Fault system approximately 20 miles east of the project site. The Melones Fault Zone is classified as "active" (demonstrated displacement within the last 100, 000 years) by Woodward and Clyde in their 1977 work related to the seismicity of the Auburn Dam area. The Bear Mountain Fault Zone is classified as "intermittently active" (definitive evidence has not been established concerning its activity within the last 100, 000 years) . Based on Woodward and Clyde's work, it is suspected that a maximum credible earthquake of Richter Magnitude 6 . 5 is possible on the Foothills Fault system. Analysis The proposed Solid Waste and HHW Recycling Programs will be housed within the large (65, 000 square feet) Recycling Center Building. Construction of this structure has taken into consideration the UBC seismic zone requirements. Mitigation Measures None required. B. Air Ouality Setting The project site is located within the San Joaquin Valley Air Basin. San Joaquin County has, in the past, exceeded Federal Standards for ozone. Ozone is a public health concern because it is a respiratory irritant, is toxic to plants, and reacts chemically with many different materials. 11