ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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Terrestrial Biological Resources The No Project Alternative would not include any development in the project area and would thus not disturb any existing on-site species or habitats. The project area would be retained in its existing state and would continue to provide the same type, extent, and quality of habitat. By comparison,the proposed project would develop the project area with wastewater collection system, effluent outfall, and recycled water distribution system pipelines and wastewater treatment facilities,resulting in potentially significant impacts on sensitive and special-status plant and wildlife species and trees.Although these impacts would be reduced to less-than-significant levels after mitigation,this alternative would not result in the substantial disturbance or removal of on-site habitat and impacts would be less.[Less] Hazards and Hazardous Materials Under the No Project Alternative,no new development would occur;therefore,no new facilities that use hazardous materials would be located in the project area and no new workers or visitors would have the potential to be exposed to existing or new sources of hazardous materials. The use of hazardous substances by the WQCF would continue;however, it is assumed that existing storage,transportation, and disposal regulations would continue to be followed. By comparison,the project would result in increased storage,use, and transport of hazardous materials during construction and operation of project facilities. There would be increased potential for construction workers and residents to be exposed to hazardous materials at existing and new contaminated areas on the project site. However, all these effects are considered less than significant through adherence to applicable regulations. Because no significant impacts related to hazardous materials and public health were identified for the project,the No Project Alternative would not reduce or avoid any significant impacts related to this issue area and similar impacts would occur.[Similar] Geology, Soils, and Seismicity The No Project Alternative would not include any new construction activities and existing buildings and other facilities would remain in their current state in the project area. Therefore,there would be no construction-related erosion potential and no potential increase in risk of exposure to injury or property damage because of a seismic event. By comparison,the project would result in potentially significant impacts related to seismic ground shaking,unstable soils, and soil erosion. However, all impacts would be reduced to less-than-significant levels after mitigation. Because the project would not result in any significant impacts related to geology, soils, and seismicity after mitigation,the No Project Alternative would not reduce or avoid any significant impacts related to this issue area and similar impacts would occur.[Similar] Paleontological Resources The No Project Alternative would not require any construction activities,thereby avoiding impacts related to the disturbance, destruction, and physical or visual alteration of any previously undiscovered fossils. Under the project, ground disturbance and development of new structures would occur,resulting in potentially significant impacts related to the potential disturbance of undiscovered fossils. This impact would be reduced to less-than- significant levels after mitigation. However,because ground disturbance would not occur under this alternative, this alternative would avoid the potential disturbance of undiscovered paleontological resources and paleontological resources impacts would be slightly less under this alternative.[Less] Hydrology and Water Quality The No Project Alternative would result in similar surface water quality impacts compared to the project. Although implementation of the project would increase treated effluent flows from 9.87 mgd ADWF to 27 mgd ADWF,treated effluent pollutant concentrations would not appreciably increase, and the quality of the treated effluent would remain high. In fact,near-and far-field pollutants are expected to exhibit only minor increases in concentration in the San Joaquin River at well-mixed conditions downstream of the effluent discharge at the EDAW Manteca WQCF and Collection System Master Plans EIR Alternatives to the Proposed Project 7-4 City of Manteca