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SAN LEANDRO SHORELINE DEVELOPMENT DRAFT EIR <br />CITY OF SAN LEANDRO <br />HYDROLOGY AND WATER QUALITY <br />criteria that protect the designated uses. Section 304(a) requires the EPA to publish advisory water quality <br />criteria that accurately reflect the latest scientific knowledge on the kind and extent of all effects on <br />health and welfare that may be expected from the presence of pollutants in water. Where multiple uses <br />exist, water quality standards must protect the most sensitive use. In California, the EPA has designated <br />the SWRCB and its RWQCBs with authority to identify beneficial uses and adopt applicable water quality <br />objectives. <br />When water quality does not meet Clean Water Act standards and compromises designated beneficial <br />uses of a receiving water body, Section 303(d) of the CWA requires that water body be identified and <br />listed as "impaired". Once a water body has been designated as impaired, a Total Maximum Daily Load <br />(TMDL) must be developed for the impairing pollutant(s). A TMDL is an estimate of the total load of <br />pollutants from point, non -point, and natural sources that a water body may receive without exceeding <br />applicable water quality standards, with a factor of safety included. Once established, the TMDL allocates <br />the loads among current and future pollutant sources to the water body. In the vicinity of the Project site, <br />Lower San Francisco Bay is listed as a Section 303(d) impaired water body.' <br />National Pollutant Discharge Elimination System <br />The National Pollutant Discharge Elimination System (NPDES) permit program was established by the <br />Clean Water Act to regulate municipal and industrial discharges to surface waters of the United States, <br />including discharges from municipal separate storm sewer systems (MS4s). Federal NPDES permit <br />regulations have been established for broad categories of discharges, including point -source municipal <br />waste discharges and nonpoint-source stormwater runoff. NPDES permits generally identify effluent and <br />receiving water limits on allowable concentrations and/or mass emissions of pollutants contained in the <br />discharge; prohibitions on discharges not specifically allowed under the permit; and provisions that <br />describe required actions by the discharger, including industrial pretreatment, pollution prevention, self- <br />monitoring and other activities. <br />Under the NPDES Program, all facilities which discharge pollutants into waters of the US are required to <br />obtain an NPDES permit. Requirements for storm water discharges are also regulated under this program. <br />In California, the NPDES permit program is administered by the SWRCB through the nine RWQCBs. The <br />City of San Leandro lies within the jurisdiction of San Francisco RWQCB (Region 2) and is subject to the <br />waste discharge requirements of the Municipal Regional Stormwater Permit (Order No. R2-2009-0074) <br />and NPDES Permit No. CAS612008, as amended by Order No. R2-2011-0083 in 2011. The Alameda County <br />permittees include Alameda County, the Alameda County Flood Control and Water Conservation District, <br />and 14 cities, including San Leandro. The current Municipal Regional Stormwater Permit (MRP) will expire <br />at the end of 2014 and a new permit is due to be reissued in 2015. <br />Under Provision C.3 of the MRP, the co -permittees use their planning authorities to include appropriate <br />source control, site design, and stormwater treatment measures in new development and redevelopment <br />projects to address both soluble and insoluble stormwater runoff pollutant discharges and prevent <br />1 State Water Resources Control Board (SWRCB), 2010. Final Integrated Report (CWA Section 303(d) List/305(b) Report. <br />http://www.waterboards.co.gov/water issues/programs/tmdl/2010state_it reports/category5 report.shtml accessed August 1, <br />2014. <br />4.8-2 DECEMBER 2014 <br />