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affect the quality of industrial stormwater discharges, and(2)identify and implement control measures and <br /> management practices to reduce pollutants in industrial stormwater discharges. The SWPPP would be amended or <br /> modified according to the requirements stipulated by NPDES stormwater permits required for future plant <br /> facilities, and future plant operations would be required to be in accordance with the plan. <br /> Measures which segregate runoff from chemical, fuel storage, and process-related areas from the storm drainage <br /> system would be incorporated into the facilities' design plans. The use of vegetation, dikes, and swales would <br /> minimize erosion potential. BMPs would be required to be incorporated into the construction plans and <br /> specifications to reduce potential pollutant loading associated with new facilities construction activities. <br /> In addition to the General Permit for industrial stormwater discharges of the WQCF as part of day-to-day <br /> operations, the SWRCB has issued a NPDES General Permit for most construction activities within the State. The <br /> preparation of a SWPPP for proposed construction activities is required under the General Permit for <br /> construction. The SWPPP for construction activities is an operational plan describing definitive measures, such as <br /> BMPs, to be used to control potential stormwater pollution. The SWPPP is kept onsite for day-to-day use during <br /> project construction and required inspection purposes. The plan is subject to constant revision onsite, depending <br /> upon the changing conditions occurring as the project develops. These and related actions that would be taken as <br /> part of and/or in response to the proposed project would minimize the impact of construction and operational <br /> stormwater quality impacts. Therefore, the project would result in a less-than-significant impact stormwater <br /> quality impacts. <br /> 4.9.3 MITIGATION MEASURES <br /> No mitigation measures are required for the following less-than-significant impacts. <br /> 4.9-1 Effects on Potential On-site and Off-site Flooding Risk from Increased Stormwater Runoff <br /> 4.9-2 Reduction in Groundwater Recharge <br /> 4.9-3 Effects of Potential Off-site Flooding Risk from Increased Treated Effluent Discharge <br /> 4.9-4 Effects of Proposed Project Discharge on Biochemical Oxygen Demand(BOD) Concentrations in Receiving <br /> Waters <br /> 4.9-5 Effects of Proposed Project Discharges on Total Suspended Solids (TSS)Concentrations in Receiving Waters <br /> 4.9-6 Effects of Proposed Project Discharges on Total Aluminum Concentrations in Receiving Waters <br /> 4.9-7 Effects of Proposed Project Discharges on Electrical Conductivity Concentrations in Receiving Waters <br /> 4.9-8 Effects of Proposed Project Discharges on Ammonia(as Nitrogen)Concentrations in Receiving Waters <br /> 4.9-9 Effects of Proposed Project Discharges on Arsenic(Dissolved) Concentrations in Receiving Waters <br /> 4.9-10 Effects of Proposed Project Discharges on Copper(Dissolved)Concentrations in Receiving Waters <br /> 4.9-11 Effects of Proposed Project Discharges on Cyanide(Total)Concentrations in Receiving Waters <br /> 4.9-12 Effects of Proposed Project Discharges on Iron (Dissolved) Concentrations in Receiving Waters <br /> 4.9-13 Effects of Proposed Project Discharges on Manganese(Dissolved)Concentrations in Receiving Waters <br /> DER EDAW <br /> City of Manteca 4.9-49 Hydrology and Water Quality <br />