R2015-109 AUTHORIZING ADMINISTRATIVE CONSENT ORDER

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25. "Unauthorized Combined Sewer Overflow"means an overflow, spill, diversion, or release of wastewater from or caused by Respondent's Combined Sewer System(s). This term will include: (i) an unpermitted discharge from the Respondent's Combined Sewer System(s) to waters of the United States (Unauthorized Combined Sewer Discharge); and (ii) any release of wastewater from the Respondent's Combined Sewer System(s)to public or private property that does not reach waters of the United States, including Backups. This does not include wet weather discharges from SDD's permitted Combined Sewage Overflow(CSO) facilities. 26. "Wastewater Treatment Plant(s)" or"WWTP(s)"means any wastewater treatment plants operated by Sanitary District of Decatur(SDD)under National Pollutant Discharge Elimination System (NPDES)Permit Number IL0028321 and located at 501 Dipper Lane, Decatur, Illinois and all components of the permitted sewage treatment plants. FINDINGS 27. Respondent is a municipality incorporated under the laws of the State of Illinois. Respondent maintains a system of separate and combined sewers to convey sanitary sewage to treatment by the SDD. 28. On December 27, 2011, Respondent received an Information Request, pursuant to Section 308 of the CWA, which included a checklist for Respondent to complete and return to EPA. Respondent responded to this information request on February 13, 2012 with the checklist and the majority of the requested infornaation. 29. On May 30, 2012, EPA called Respondent and discussed questions concerning Respondent's February 13, 2012 submittal. Respondent sent EPA an email on June 1, 2012 with additional infortnation that was requested during the phone discussion. 30. Respondent owns and operates both a Combined Sewer Collection System and a Separate Sanitary Sewer Collection System, both of which discharge into the SDD system. 31. SDD owns and operates four Combined Sewage Overflow(CSO) facilities within Respondent's city limits. The four CSOs are permitted in SDD's NPDES permit (IL0028321)with the following names: Outfa11003 Oakland Avenue Treated Combined Sewage Outfall, South Edward Street Treated Combined Sewage Outfall,McKinley Avenue Treated Coznbined Sewage Outfall, and Seventh Ward Treated Combined Sewage Outfall. 32. Respondent maintains a Storm Water Sewer System(NPDES permit number ILR400181) for the areas that contain a Sepaxated Sanitary Sewer System. The Storm Sewer System has final dispositions to Lake Decatur and the Sangamon River. Lake Decatur and the Sangamon River are waters of the United States and thus "navigable waters"pursuant to Section 502(7) of the CWA, 33 U.S.C. § 1362(7). 4