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Stormwater NPDES Permit <br /> The CWA also established a framework for regulating municipal and industrial stormwater discharges under the <br /> NPDES Program. In November 1990,the EPA published regulations establishing NPDES permit requirements for <br /> specified categories of industries, including wastewater treatment plants. Phase 1 of the permitting program <br /> applied to municipal discharges of stormwater in urban areas where the population exceeded 100,000 persons. <br /> Phase 1 also applied to stormwater discharges from a large variety of industrial activities, including general <br /> construction activity if the project would disturb more than 5 acres. Phase 2 of the NPDES stormwater permit <br /> regulations,which became effective in March 2003,required that NPDES permits be issued for construction <br /> activity for projects that disturb between 1 and 5 acres. Phase 2 of the municipal permit system(known as the <br /> NPDES General Permit for Small MS4s)requires small municipal areas of less than 100,000 persons to develop <br /> stormwater management programs. <br /> Title 27, Division 2 <br /> Title 27,Division 2 of the California Code of Regulations regulates water quality aspects of waste discharge to <br /> land. The regulations establish waste management requirements for waste treatment, storage, or disposal in <br /> landfills, surface impoundments,waste piles, land treatment facilities, and other waste management units. They <br /> include minimum standards for proper management of each waste category.Waste management units at the <br /> Manteca WQCF that are currently subject to Title 27 regulations include the dedicated land disposal areas(DLDs) <br /> and a landfill formerly used for disposal of grit and screenings. The solids storage basins (SSBs)are not <br /> specifically regulated under Title 27,but are regulated under WDRs. The WDRs include a groundwater <br /> monitoring program,which is designed to determine if leakage from solids storage and disposal facilities has <br /> occurred and if it could affect groundwater quality. <br /> 4.9.2 ENVIRONMENTAL IMPACTS <br /> ANALYSIS METHODOLOGY <br /> Hydrology <br /> Analysis of potential impacts related to hydrology is based on information obtained from the City of Manteca <br /> Storm Drain Master Plan(May 2006)and site investigations. Because the project would not require increased <br /> potable water and would not construct any groundwater wells,no impacts to the underlying groundwater basin <br /> would occur and this issue is not analyzed further in this EIR. The project site is not located near the ocean and as <br /> a result would not be subject to flood-related effects associated with a tsunami. The only project facilities that <br /> would be located above ground near an open body of water would be the proposed outfall structure. This structure <br /> would be designed to withstand the effects of flood inundation; therefore, impacts to project facilities as a result <br /> of a seismically induced seiche would not occur and this issue is not evaluated further in this EIR. Because the <br /> project is not locted in a 100-year flood zone and would not construct any housing,the project would not result in <br /> any direct impacts related to placing people and/or structures in a 100-year flood hazard area. Because the local <br /> Office of Emergency Services prepared a Dam Failure Plan that provides an adequate evacuation plan in case of a <br /> dam failure,the project would not expose people or structures to a significant flooding risk resulting from the <br /> failure of dam. These impacts are not evaluated further in this EIR. <br /> Water Quality <br /> Selection of Water Quality Constituents <br /> Water quality constituents were selected for quantitative near-and far-field analyses based on availability of <br /> adequate detected data in effluent and one or more of the following conditions (Table 4.9-10): <br /> DER EDAW <br /> City of Manteca 4.9-23 Hydrology and Water Quality <br />