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The choice of equipment during the construction, therefore, would be important to the level of impacts experienced by the adjacent residences. Delivery trucks and construction vehicles would temporarily subject residences adjacent to haul routes to higher noise levels. It should be noted that the initial effect of construction noise would be temporary and confined to relatively small areas at any one time. Motor Vehicle Traffic Noise Impacts. Post construction noise would be generated as a result of future traffic conditions. Table 3.7-2 summarizes the project generated sound level increases after completion. As shown in Table 3.7-2, the project generated increases range from less than 0.1 dBA to 1.3 dBA. This range of increase is not noticeable and is not significant. The future sound levels at the measurement locations were calculated based on the existing levels with adjustments for the project generated and cumulative increases associated with the projected traffic volumes. Thus, at location 2 near Valpico Road and Chrisman Road, the sound levels will be increased from the existing value of 70 Ldn to 71 Ldn under cumulative future traffic conditions, and will be 6 dBA in excess of the 65 dBA limit which is designated by the zoning ordinance for residential areas. At location 3 at the reference location along MacArthur Drive, the sound levels will be increased from the existing value of 67 Ldn to 68 Ldn and will be 3 dBA in excess of the residential limit. At location 1, the sound level under cumulative traffic conditions will depend on the specific development plan. Railroad Noise. For the year 2005, the projected distance from the Western Pacific Railroad track center (Southern Pacific Operations) to the 65 dBA CNEL contour is 218 feet (San Joaquin County Council of Governments, 1986). In addition, the projected distance from the Southern Pacific Railroad track centerline to the 65 dBA CNEL contour is 27 feet. Any proposed future residences which are located within these stated distances along these railroad lines would be susceptible to sound levels of 65 dBA CNEL. Aircraft Noise. The proposed residential sensitive receptors should not be affected by noise due to either takeoff or landing operations from Tracy Municipal Airport in relation to light planes. The present aircraft noise was barely detectable during the recent sound level measurements. MITIGATION MEASURES. The following subdivision stage mitigation measures are recommended to minimize adverse noise impacts. Construction - All construction vehicles and equipment should be properly muffled. California state noise standards for delivery motor vehicles should be met. - Construction operations and related travel in the vicinity of the project site to and from the construction area should be limited to between the hours of 7 A.M and 7 P.M. 3.7-4