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Walnut Basin TMDLsThe Section 303(d) list submitted to and approved by EPA in 1998, identifies 43 river segments and 5 lakes in the Walnut River Basin as water quality impaired. Among the streams, the greatest number of impairments were caused by excessive levels of fecal coliform bacteria and sulfate. Among the lakes, eutrophic conditions indicative of excessive algae production were the predominant cause of impairment. Other pollutants limiting the use of the Walnut River Basin streams include ammonia and nutrient oxygen demand. Additional lake impairments were caused by dissolved oxygen depletion, siltation, and fecal coliform bacteria. Each parameter causing impairment requires a TMDL. Many of the stream segments, configured in a watershed setting, have a TMDL applied to them as a whole. Seven watershed and 7 lake TMDLs have been developed. These TMDLs were submitted to EPA on June 27, 2002 and have been approved. |