United States Office of Water (4203) EPA-833-R-07-005 Environmental Protection Washington, DC 20460 May 2007 Agency www.epa.gov/npdes/cso The Long-Term Control Plan- EZ (LTCP-EZ) Template: A Planning Tool for CSO Control in Small Communities The LTCP-EZ Template: A Planning Tool for CSO Control in Small Communities Table of Contents BACKGROUND...................................................................................................................................................................... 1 INSTRUCTIONS: FORM LTCP-EZ ........................................................................................................................................ 5 General Information ................................................................................................................................................................ 6 Nine Minimum Controls (Schedule 1—NMC) ......................................................................................................................... 6 Sensitive Areas ....................................................................................................................................................................... 6 Water Quality Considerations ................................................................................................................................................. 7 System Characterization (Schedule 2—MAP) ........................................................................................................................ 8 Public Participation (Schedule 3—PUBLIC PARTICIPATION)............................................................................................. 10 CSO Volume (Schedule 4—CSO VOLUME) ........................................................................................................................ 11 Evaluation of CSO Controls (Schedule 5—CSO CONTROL) .............................................................................................. 11 Affordability (Schedule 6—CSO AFFORDABILITY) ............................................................................................................. 11 Recommended CSO Control Plan ........................................................................................................................................ 12 INSTRUCTIONS: SCHEDULE 4 – CSO VOLUME.............................................................................................................. 14 Sub-Sewershed Area ............................................................................................................................................................ 16 Runoff.................................................................................................................................................................................... 16 Dry Weather Flow Within the CSS........................................................................................................................................ 17 Peak Wet Weather Flow ....................................................................................................................................................... 17 Overflow ................................................................................................................................................................................ 17 Diversion ............................................................................................................................................................................... 17 Conveyance .......................................................................................................................................................................... 18 Treatment.............................................................................................................................................................................. 19 CSO Volume ......................................................................................................................................................................... 20 INSTRUCTIONS: SCHEDULE 5 – CSO CONTROL .......................................................................................................... .21 Conveyance and Treatment at the WWTP ........................................................................................................................... 23 Inflow Reduction – Residential.............................................................................................................................................. 23 Sewer Separation.................................................................................................................................................................. 24 Off-Line Storage.................................................................................................................................................................... 24 Summary of Controls and Costs ........................................................................................................................................... 24 INSTRUCTIONS: SCHEDULE 6 – CSO AFFORDABILITY ................................................................................................ 26 Phase I Residential Indicator ................................................................................................................................................ 27 Current Costs ........................................................................................................................................................................ 27 Projected Costs (Current Dollars) ......................................................................................................................................... 27 Cost Per Household .............................................................................................................................................................. 28 Median Household Income (MHI) ......................................................................................................................................... 28 Residential Indicator.............................................................................................................................................................. 29 Phase II Permittee Financial Capability Indicators................................................................................................................ 29 Debt Indicators ...................................................................................................................................................................... 30 Overall Net Debt.................................................................................................................................................................... 30 Socioeconomic Indicators ..................................................................................................................................................... 31 Unemployment Rate ............................................................................................................................................................. 31 Median Household Income ................................................................................................................................................... 32 Financial Management Indicators ......................................................................................................................................... 32 Property Tax and Collection Rate ......................................................................................................................................... 33 Matrix Score: Analyzing Permittee Financial Capability Indicators....................................................................................... 33 GLOSSARY ..........................................................................................................................................................................35 REFERENCES......................................................................................................................................................................39 APPENDIX A—ONE-HOUR THREE-MONTH RAINFALL INTENSITIES FOR SCHEDULE 4 – CSO VOLUME APPENDIX B—HYDRAULIC CALCULATIONS WITHIN LTCP-EZ SCHEDULES 4 AND 5 APPENDIX C—COST ESTIMATES FOR SCHEDULE 5 – CSO CONTROL i The LTCP-EZ Template: A Planning Tool for CSO Control in Small Communities LIST OF ACRONYMS AF – Annualization Factor BOD – Biochemical Oxygen Demand CPH – Costs per Household CPI – Consumer Price Index CSO – Combined Sewer Overflow CSS – Combined Sewer System DO – Dissolved Oxygen DMR – Discharge Monitoring Report DWF – Dry Weather Flow EPA – Environmental Protection Agency FWS – Fish and Wildlife Service I/I – Inflow/Infiltration IR – Interest Rate LTCP – Long-term Control Plan MG – Million Gallons MGD – Million Gallons per Day MHI – Median Household Income NOAA – National Oceanic and Atmospheric Administration NMC – Nine Minimum Controls NMFS – National Marine Fisheries Service NPDES – National Pollutant Discharge Elimination System POTW – Publicly Owned Treatment Works TMDL – Total Maximum Daily Load TSS – Total Suspended Solids WQS – Water Quality Standards WWT – Wastewater Treatment WWTP – Wastewater Treatment Plant ii The LTCP-EZ Template: A Planning Tool for CSO Control in Small Communities BACKGROUND What is the LTCP-EZ Template and what is its Purpose?