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The most recently approved(1998) complete CWA Section 303(d)list for California identifies the Delta <br /> waterways as water-quality impaired for a number of constituents. The State has completed a public process to <br /> update the 303(d) list(SWRCB Resolution No. 2006-0079), and the SWRCB has submitted revisions to EPA for <br /> approval. On November 20, 2006,the EPA partially approved California's 2006 303(d)list, and is in the process <br /> of reviewing the State's proposed delisting and do not list waters. The recommended changes include the addition <br /> of 53 new water bodies and pollutants to the list; removal of 3 water bodies and pollutants from the list; <br /> refinement of identified impaired reaches; and changes in TMDL development priorities. Potential sources of the <br /> 303(d) listed contaminants for the San Joaquin River and Sacramento-San Joaquin Delta area, and estimated <br /> completion dates for their TMDL implementations, are shown in Table 5-2. <br /> Table 5-2 <br /> Potential Sources and Proposed TMDL Completion Dates for San Joaquin River and <br /> Sacramento-San Joaquin Delta Section 303(d) Listed Pollutants <br /> Pollutant/Stressor Potential Sources Proposed TMDL Completion <br /> Chlorpyrifos Agriculture,Urban Runoff/Storm Sewer 2019 <br /> DDT Agriculture 2011 <br /> Diazinon Agriculture,Urban Runoff/Storm Sewer 2019 <br /> Dioxin Point Source 2019 <br /> Electrical Conductivity Agriculture 2019 <br /> Exotic Species Source Unknown 2019 <br /> Furan Compounds Contaminated Sediments 2019 <br /> Group A Pesticides' Agriculture 2011 <br /> Mercury Resource Extraction(abandoned mines) 2006 <br /> Pathogens Urban Runoff/Storm Sewer,Recreational and 2008 <br /> Tourism Activities(nonboating) <br /> PCBs Point Source 2019 <br /> Unknown Toxicityz Source Unknown 2019 <br /> 'One or more Group A Pesticides(Group A pesticides include aldrin,dieldrin,chlordane,endrin,heptachlor,heptachlor epoxide,BHC <br /> (including Lindane),endosulfan,and toxaphene). <br /> 2 Toxicity is known to occur,but the constituent(s)causing toxicity is unknown. <br /> Source:RWQCB 2006 303(d)list.Adapted from the City of Manteca in 2007. <br /> The overall impact of the development and implementation of TMDLs would be to reduce loadings of pollutants <br /> of primary concern to the Delta to the point that water quality objectives are achieved or to implement other <br /> activities to attain standards. Each TMDL would separately consider available scientific information in a <br /> quantitative fashion in establishing load reduction plans. The specific outcomes of these TMDLs, in terms of the <br /> reductions to be required on individual sources are highly uncertain at this time. That process must be carried out <br /> before judgments can be made regarding the most equitable and cost effective load reduction plan. It would be <br /> premature to assume any specific level of reduction for any specific source prior to completion of the individual <br /> TMDLs. <br /> Although the regulatory system established under the CWA and state law would require that water quality <br /> standards be met, a high degree of uncertainty exists as to when this will be achieved. <br /> EDAW Manteca WQCF and Collection System Master Plans EIR <br /> Cumulative Impacts 5-8 City of Manteca <br />