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Potential impacts associated with accidental release or exposure to hazardous materials will be less than significant with implementation of mitigation measures that require that all contractors transport, store, and handle construction-related hazardous materials utilized in connection with construction at the project site as required by applicable law, a site-specific spill response plan, and a Hazardous Materials Management Plan ("HMMP") for construction of each phase of the project. Potential impacts associated with the siting of a portion of the project over former wastewater discharge ponds associated with the adjacent Cal Suprema Cheese facility operation will be less than significant with implementation of a mitigation measure that requires that the applicant to ensure the completion of remediation of soils conditions within such ponds under the regulatory oversight of the Regional Water Quality Control Board ("RWQCB"). Potential impacts from the exposure of people or structures to a significant risk of loss, injury, or death involving wildland fires during project construction will be less than significant with implementation of mitigation measures that require the utilization of certain fire protection measures, including the clearing of dried vegetation in construction areas, equipping construction equipment with a functioning spark arrester, training work and maintenance/operations crews in the use of fire protection equipment. The project's contribution to cumulative impacts from transport, use, and storage of hazardous materials, wildland fires, and interference with emergency response will be less than significant with implementation of the mitigation measures. The project's impact to hazards and hazardous materials has been identified as a potentially significant impact but will be reduced to a less than significant impact with the incorporation of the mitigation measures. Hydrology and Water Quality Wastewater from the crane maintenance pad, the maintenance shop, the diesel fuel storage area, and the fueling and fuel pump areas of the project will be routed through an oil/water separator and then J discharged to an evaporation pond. Here, water will be evaporated, and residuals will be disposed of in accordance with county and state, and federal requirements. Potential leaching of water from the evaporation pond into the subsurface will carry with it various pollutants, including fuel- and lubricant- related pollutants, which may degrade groundwater quality. However, the proposed evaporation pond will contain impermeable pond liners to directly prevent infiltration of pond water to groundwater, and thereby also prevent the migration of potential groundwater pollutants into the subsurface, as could otherwise occur if infiltration were not prevented. Failure of the proposed lining, however, could result in significant impacts to groundwater quality. Further, siting of the proposed stormwater infiltration basins in areas where existing surface or subsurface contamination is located could result in the further migration of such contamination, deeper into the subsurface, potentially resulting in increased rates of groundwater degradation. In particular, infiltration facilities sited within the former cheese production facility wastewater pond areas could result in the mobilization of additional nitrate and total dissolved solids (salts) into underlying groundwater, resulting in increased pollutant levels within groundwater underlying the project site and adjacent areas. The proposed onsite stormwater system will be sufficient to contain a 100-year storm event at the project site, with nearly 10 acre-feet of additional storage available. Industrial wastewater will also be treated and evaporated onsite,with no discharge to surface waters required. Therefore, implementation of the proposed project will result in installation of sufficient onsite stormwater and drainage control facilities to handle anticipated runoff rates without discharging water from the project site, and without contributing to downstream or offsite flooding. However, finalized designs for the proposed stormwater basins have not yet been completed and so the project could increase the potential for flooding, erosion, or siltation onsite and offsite due to altered drainage patterns as a result of the increased level of facility operations, or result in increased stormwater flows that could exceed the drainage system capacity. San Joaquin County PA-0900184 & 185\Union Pacific Community Development Page 12