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5.0 IMPACT OVERVIEW Cumulative impacts to the structural integrity of the roadways resulting from excavation of thero' site have been described in the Project Impacts section of the report. p sect Noise Noise levels at buildout(year 2010)were projected along streets serving the site. The noise projections were based on traffic data provided for this project by the traffic consultant(Omni-Means, 1991). Noise levels at buildout along Peltier Road would be higher than existing by 12 dB. This noise level increase would be due to cumulative growth in the greater area and not due to the proposed project. Similar noise level increases would be expected from increased traffic volumes on Lower Sacramento Road. Noise level increases of 5 dB or more are considered significant. Existing residences adjacent to these two roads could be potentially impacted by noise. Noise level increases along Davis Road at buildout would be attributed to project-generated traffic but were previously found to be less than significant. In summary, any significant existing to future noise level increases along streets serving the project site would be attributed to cumulative growth in the area and not due to project-generated traffic. Air Quality The project is part of a pattern of urbanization within the San Joaquin Valley air basin that has important implications for regional air quality. The 1991 Air Quality Attainment Plan (SJVUAPCD, 1991b)and San Joaauin Valley Unified Air Pollution Control District PM-10 Nonattainment Area Plan(SJVUAPCD, 1991 a)are recent attempts to forecast future air quality trends and develop control strategies to bring air quality into compliance with the national and state ambient air quality standards. Even utilizing all feasible and available control measures, attainment of the ozone,carbon monoxide and PM-10 standards in the San Joaquin Valley air basin is not forecast in this decade. A major impediment to attaining these standards is projected growth in population within the air basin. Geology/Soils The proposed project will have minimal cumulative impacts from a soils standpoint. The cumulative wastewater impacts, with respect to nitrate additions to groundwater, are discussed in the Water Resources Section. Soil erosion and dust generation are likely to be of only short-term duration. The excavation and removal of soil from the site will have a long-term cumulative effect in changing the character of the site; but,mostly with respect to the hydrology. The use of the soil elsewhere for level constriction or other building purposes can be viewed as a positive cumulative impact of the project. Water Resources The project has the ability to create long term cumulative hydrological and water quality impacts locally and in downstream areas. 5-3