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4.1.8 Utilities and Service Systems Summary of Potential Impacts An evaluation of potential impacts from the project on utilities and service systems is found in Section 4.12 (Utilities and Service Systems) of the Draft EIR. The proposed project would include installation of an upgraded Industrial Wastewater Treatment Plant ("IWPP'� located at the south end of the project site, near the proposed Maintenance Building. The IW17P would collect wash down and stormwater from areas with high potential for contamination, including the crane maintenance pad, the maintenance shop, the diesel fuel storage area, and the fueling and fuel pump areas. This water would be passed through an oil/water separator, and then discharged into a lined evaporation basin. Thus, water from the IW'I'P would not be discharged offsite, but would be contained in on-site facilities until evaporated. Potential leaching of water from the evaporation pond into the subsurface could carry with it various pollutants, including fuel and lubricant related pollutants, which could degrade groundwater quality and exceed wastewater treatment requirements of the RWQCB.Further,sewage from the existing Union Pacific facility is currently treated by a septic system and leach field located directly south of the existing Maintenance Building.With the proposed expansion,the Maintenance Building and Gate Building would be relocated. Thus, the septic system would also be relocated to serve the new Gate Building and Driver Kiosk to be located near Roth Road, and a new septic system would be constructed to serve the relocated Maintenance Building at the south end of the site. Although the proposed project would not be connected to a public sewer system,the operation of the proposed septic system could result in environmental impacts if not designed to adequately handle sewage generated by the project In addition, stormwater from the project site would be channeled into a series of on-site stormwater retention and infiltration basins, and would result in no discharge of stormwater from the project site. Construction of the project would therefore result in on-site changes to stormwater flow paths and directions, and to the total volume of stormwater that is currently generated on-site. If these flows were improperly managed, they could result in the erosion and entrainment of soils and sediments on-site,and cause sedimentation within the proposed stormwater retention ponds. The project could also contribute to cumulative impacts on wastewater treatment and stormwater drainage facilities. Findings The County finds that, pursuant to Section 15091(a)(1) of the CEQA Guidelines, changes or alterations have been required in or incorporated into the project, which mitigate or avoid potential impacts from exceedances of wastewater treatment requirements, from construction of a new septic system and from construction of new storm water drainage facilities or expansion of such facilities on existing wastewater conveyance facilities as identified in the Final EIR. The County further finds that the change or alteration in the project or the requirement to impose the mitigation as a condition of project approval is within the jurisdiction of the County to require, and that this mitigation is appropriate and feasible. Facts in Support of Findings Potential impacts from exceedances of wastewater treatment requirements will be less than significant with implementation of Mitigation Measure UTII.ITIES-1, which in tum requires implementation of Mitigation Measure HYDRO-1, which would require that all evaporation ponds be double-lined with impermeable material and fitted with an automatic leak detection system between the two layers of impermeable material. Monitoring for leak detection shall also be completed (automatically) on a continuous basis throughout the duration of project operations. In the event a leak is detected, the applicant shall ensure the pond is drained and not used until the liner is repaired and shall notify appropriate response and regulatory agencies.Potential impacts from construction of a new septic system will be less than significant with implementation of J November 2012 13 Findings of Fact/ Statement of Overriding Considerations