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IV. IMPACT OVERVIEW stormwater runoff from the addition of impervious surface at the site would be mitigated to less than significance with implementation of Mitigation Measure F.3. The General Plan EIR(1990x) concludes that the potential for localized flooding due to storm runoff will not be a problem in new developments due to the continued implementation of the City's Storm Drainage Master Plan. Considering the size and nature of the project relative to the total area that potentially could contribute to water quality impacts on the Stockton Deep Water Channel and the San Joaquin River,the mitigation measures that would be implemented with the project, and the conclusions of the General Plan EIR,the contribution of the project to cumulative hydrology and water quality impacts would be less than cumulatively considerable, and therefore would not be significant. PUBLIC HEALTH AND SAFETY The Public Health and Safety impacts identified in the EIR are site specific to the operation of a municipal solid waste transfer station and do not apply to other types of projects in the industrial uses in the vicinity. Therefore the project would not contribute to cumulative public health and safety impacts. C. UNAVOIDABLE SIGNIFICANT ADVERSE IMPACTS Although mitigation measures have been identified, where feasible,for all of the significant impacts of the proposed transfer station expansion,the project would result in some impacts that are significant and unavoidable even after implementation of available,feasible mitigation measures. These impacts are identified in Summary Table S.1, and are discussed in Section III.B, Air Quality. D. EFFECTS FOUND NOT TO BE SIGNIFICANT Prior to preparation of this SEIR,the City of Stockton prepared an Initial Study of the proposed project to determine what environmental impacts the project may have. The Initial Study ruled out the following impact areas from further consideration in the SEIR: GEOLOGY The site does not have geologic features or soil conditions that would pose particular hazards or cause adverse environmental impacts. The clay soils at the site have shrink-swell potential, and the site—along with much of City of Stockton and roughly half of San Joaquin County—has a "high"soil limitation rating for shrink swell behavior(City of Stockton, 1990b). As noted in the General Plan Background Document(1990b), hazards of expansive soils can be avoided through proper drainage and foundation design,and the City of Stockton Building Inspection Division requires all structures to design for expansive soils. Such design requirements would apply to construction of the building enclosing the pit and sort line. Stockton Sravenger Transfer Station Expansion IV A ESA/990190