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'yl n 3,272,4 pounds per day of NO, and 26.8 pounds per day of PMIO. Because the SJVUAPCD emission threshold for NO,, would be exceeded, the cumulative impact related to NO, would be significant. Mitigation Measure AQ-2 will help reduce this impact, but not to a less than significant level. This cumulative impact is therefore significant and unavoidable. Impacts related to ROG and PM 10 would be less than significant. �k Noise The cumulative traffic noise analysis conducted for this. report is based on the traffic assumptions identified in the "Transportation and Circulation" section above. Table 13-7 shows predicted traffic noise levels under cumulative conditions and provides a comparison to existing conditions. Significant cumulative traffic noise impacts are considered to occur at residential locations where the predicted traffic noise level exceeds 65 dB-Ldn and a substantial traffic noise increase(i.e., at least 5 dB) would occur as compared to existing conditions. Significant cumulative traffic noise impacts would occur along Airport Way both north and south of the airport and along SR 99 north of Arch-Airport Road. Under cumulative conditions the total number of annual aircraft operations is anticipated to be about 17% greater than 2015 project conditions with most of the increase coming from r commercial and general aviation operations. This corresponds to less than approximately a 1-dB increase in aircraft noise over 2015 project conditions. Because of the reduction in large or noisy military aircraft and the projected change in the air carrier fleet mix to quieter aircraft under cumulative conditions, aircraft operations under cumulative conditions are expected to produce noise that is less than existing conditions. Cumulative aircraft noise impacts are not anticipated to occur. However, aircraft noise will contribute to the significant cumulative traffic noise impacts discussed above. Public Services and Utilities Cumulative development in Stockton would result in an inadequate supply of surface water to serve long-term projected growth. The significance of this impact is considered to be unknown because, although water from other sources, such as the New Melones Dam, is likely to be available as a long-term interim supply to serve cumulative development, this supply could decrease in the future because the ultimate water rights from these sources belong to upstream users in Calaveras and Stanislaus Counties (Michael Paoli and Associates 1989b). Cumulative development in Stockton could also result in the potential to overload the wastewater collection and treatment system leading to possible overflows and backups in the collection system and exceedance of the capacity of the treatment plant (Michael Paoli and Associates 1989b). To mitigate this potentially significant impact to a less-than-significant level, the City adopted a mitigation measure that requires that new development provide and/or contribute Stock-ton Metropolitan Airport Master Plan Chapter 13. Cumulative Impacts 1� Draft 1 nvironmenial Inpact Report 13-5 March 20, 1998 t.