City of Omaha Combined Sewer Overflow Annual Report

City of Omaha Combined Sewer Overflow Annual Report

City of Omaha Combined Sewer Overflow Annual Report NPDES Permit No. NE0133680 October 1, 2010 through September 30, 2011 Table of Contents I. Introduction ............................................................................................................................................. 3 II. Executive Summary ................................................................................................................................ 3 A. Nine Minimum Controls (NMC) ............................................................................................ 4 B. LTCP Documentation .............................................................................................................. 4 C. Compliance Schedule ............................................................................................................... 4 D. CSO Outfall Monitoring .......................................................................................................... 5 E. In-stream Monitoring ............................................................................................................... 5 F. Other Information .................................................................................................................... 5 III. Nine Minimum Controls ....................................................................................................................... 6 A. Proper Operation and Maintenance (O & M) ....................................................................... 6 B. Maximize Use of the Collection System for Storage ............................................................ 6 C. Review and Modification of Pretreatment Programs .......................................................... 7 D. Maximization of Flow to the POTWs for Treatment ........................................................... 8 E. Prohibition of CSOs during Dry Weather ............................................................................. 9 F. Control of Solid and Floatable Materials in CSOs ............................................................. 12 G. Pollution Prevention .............................................................................................................. 12 H. Public Notification .................................................................................................................. 13 I. Monitoring to Characterize CSO Impacts and the Efficacy of CSO Controls ................ 13 IV. LTCP Documentation ........................................................................................................................... 16 A. Characterization and Modeling of the CSO System .......................................................... 16 B. Public Participation Plan ....................................................................................................... 17 C. Consideration of Sensitive Areas ......................................................................................... 17 D. Evaluation of Alternatives..................................................................................................... 18 E. Cost/Performance Considerations ...................................................................................... 18 F. Operational Plan ..................................................................................................................... 18 G. Maximizing Treatment at the Existing POTW Treatment Facilities ................................ 18 H. Implementation Schedule...................................................................................................... 19 I. Post-Construction Compliance Monitoring Program ....................................................... 20 V. Compliance Schedule ........................................................................................................................... 22 A. Project Implementation ......................................................................................................... 22 B. LTCP Overall .......................................................................................................................... 26 VI. CSO Outfall Monitoring Data ............................................................................................................. 29 A. Missouri River Wastewater Treatment Plant (MRWWTP) - Outfall 102 ........................ 30 B. CSO Discharge Monitoring at Select Outfalls .................................................................... 30 VII. In-Stream Monitoring Data ......................................................................................................... 32 VIII. Other Information ........................................................................................................................ 35 A. Missouri River Flood ............................................................................................................. 35 B. Reduction in the Number of Overflow Events ................................................................... 37 C. Reduction in the Number of CSO Outfalls ......................................................................... 38 D. Receiving Water Quality ....................................................................................................... 38 E. City of Omaha RNC Program ............................................................................................... 40 F. Rate Information ..................................................................................................................... 41 G. Material Management ............................................................................................................ 42 Attachment 1 – SOP Reporting of Dry Weather Sewer Overflows and Bypasses ......................................... 43 Attachment 2 – Dry Weather Overflow Media Releases .................................................................................. 44 Attachment 3 – Public Participation Report ....................................................................................................... 45 Attachment 4 – LTCP Project Progress Reports ................................................................................................. 46 Attachment 5 – LTCP Project Change Documentation ..................................................................................... 47 List of Figures Figure 1: Total Projects Graph ................................................................................................................ 27 Figure 2: CSO Monitoring ....................................................................................................................... 29 Figure 3: In-Stream Monitoring ............................................................................................................. 32 Figure 4: TSS Values Compared Over Time ......................................................................................... 39 Figure 5: E.coli Values Compared Over Time...................................................................................... 39 Figure 6: E.coli Reduction over LTCP implementation ...................................................................... 40 Figure 7: Average Residential Sewer Fee Increase .............................................................................. 41 List of Tables Table 1- NPP Industries in CSS ................................................................................................................ 8 Table 2 - Dry Weather CSOs reached waters of the State .................................................................. 10 Table 3 - Dry Weather CSOs that were contained ............................................................................... 11 Table 4 - Wet Weather CSO Occurrences ............................................................................................. 14 Table 5 - Flow Monitoring Program ...................................................................................................... 17 Table 6 - Phase I Major Projects of the LTCP ....................................................................................... 23 Table 7 - Phase 2 Major Projects of the LTCP ....................................................................................... 24 Table 8 - Phase 3 Major Projects of the LTCP ....................................................................................... 24 Table 9 - Phase 1 and 2 Sewer Separation Projects .............................................................................. 25 Table 10 - Phase 3 and 4 Sewer Separation Projects ............................................................................ 26 Table 11 - Phase Milestones .................................................................................................................... 27 Table 12 - CSO 102 Monitoring Summary ............................................................................................ 30 Table 13 - CSO Monitoring ..................................................................................................................... 31 Table 14 - In-Stream Monitoring Results .............................................................................................. 34 - 2 - ___________________________________________________________________________________________________________________________ I. Introduction A National Pollutant Discharge Elimination System (NPDES) Permit (NE0133680) for City of Omaha Combined Sewer Overflows

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