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5.15 WATER RESOURCES appropriate receiving facility resulting in no onsite discharge. Equipment wash water will be collected and disposed of off site. 5.15.2.2 Operational Impacts 5.15.2.2.1 Drainage The project site is currently partially developed with several impervious surfaces,mainly roads. Development of the project will result in an increase of impervious surfaces and once developed,the project will result in approximately 4.4 acres of impervious surfaces. Stormwater runoff from the site will be captured and directed to the WPCF. Currently,the stormwater from the adjacent STIG plant also is directed to the WPCF. The stormwater collection system will be designed to discharge directly to the WPCF at a rate that would not exceed the WPCF's capacity. The increase in the amount of impervious surface is not expected to significantly change the amount or timing of runoff from the LEC project site. Because stormwater would be collected and discharged to the WPCF,the LEC project would not result in substantial erosion,siltation, or flooding on-or offsite. Therefore, operational impacts to drainage patterns are less than significant. 5.15.2.2.2 Water Quality Operation of the LEC project will not result in any direct discharge offsite to receiving surface or groundwater. All runoff from the site will be collected and discharged to the WPCF. Because there is an agreement in place with the City of Lodi to accept stormwater and sanitary discharge from the LEC project, operational impacts to surface water and groundwater quality are less than significant. 5.15.2.2.3 Waste Discharge Requirements Wastewater from the LEC will be discharged to a new onsite Class I underground injection well to be constructed as part of this project. This well will be permitted through the EPA's Underground Injection Control (UIC) program,which strictly regulates the conditions on which a permit for Class I injection wells can be issued. Class I permits allow the injection of hazardous and nonhazardous fluids (industrial and municipal wastes) into isolated formations beneath the lowermost underground source of drinking water (EPA,2004). The LEC would discharge up to a maximum of 225 gallons per minute of process wastewater to the underground injection well. In addition, as described in Section 5.15.1.5,two additional wells are included in the UIC permit package that will be submitted to EPA Region IX. The LEC facility will use the existing Class I injection well currently in use at the STIG plant as a backup in the event the new well is unavailable. Because wastewater discharge to the injection well would be permitted under the EPA's UIC program,impacts to groundwater quality would be less than significant. The UIC permit package will include the following items: • Permit Application • Area of review methods • Maps of well areas and area of review • Corrective action plan and well data 5.15-20 SAC/3713221082340005(LEC_5.15_WATER_RESOURCES.DOC)