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Carbon Monoxide. The CO air quality analysis performed for this Background Report used a computer model called CALINE3, a line source air quality model developed by Caltrans to analyze localized air quality 'urpacts (Benson 1979). This air quality analysisfocuses on the potential for localized COproblems near heavily traveled, congested intersections. More specifically, CO concentrations were estimated at the following intersections: o Turner Road/Lower Sacramento Road o Kettleman Lane/Hutchins Street o Lodi Avenue/Hutchins Street o Lodi Avenue/Lower Sacramento Road o Lodi Avenue/Cherokee Lane o Kettleman Lane/Beckman Road These intersections were identified by City staff as those with a potential for significant traffic congestion and air quality problems (Prima and Fernandez pers. comms.). The CALLNE3 air quality analysis estimated CO concentrations at "receptors," specific geographic points representing locations where people would be exposed to CO. CALINE3 estimates,for each receptor, the total CO concentrations that result form many pieces of a roadway system and estimates what those resulting concentrations would be at sped points in the vicinity of the roadway system Receptors are typically residences or places of work near congested intersections where people would be exposed to vehicle-generated CO for extended periods of time. Receptor locations were placed 50 feet from the edge of the roadways. The setback of 50 feet is considered to be an average setback and represents the closest point at which people would experience long-term exposure to roadway-generated CO. The air quality analyses used p. .peak-hour traffic data as described in Chapter 7, "Transportation and Circulation. " CO concentrations were estimated at the receptors lisW in Table 13-4. Table 13-4 shows estimated existing CO concentrations in the vicinky of intersections listed above. Twelve of the receptor locations show a potential Wokdon of the state or federal eight- hour CO standard of 9 ppm. In addition,four of the receptor locations show a potential for violation of the state one-hour standard of 20 ppm. None of the receptor locations show a potential for violation of the federal one-hour standard of 35 ppm. The highest estimated worst-case eight-hour average value under existing traflc conditions is 15.2 ppm at the intersection of Kettleman Lane and Hutchins Street. The highest predicted worst-case one-hour average value under this traffic condition is 25.3 ppm at the same intersection. 18