Combined Sewer System Long Term Control Plan - DC Water

Table of Contents
11.3.6 Alternatives Based on Zero Overflows in the Period 1988-1990..............11-22
11.3.7 Alternatives Sized for 5-Year 24-Hour Storm...........................................11-22
11.4 EVALUATION OF ALTERNATIVES.................................................................11-27
11.5 ABILITY TO MEET NUMERIC WATER QUALITY STANDARDS ...............11-32
11.6 SELECTION OF FINAL LTCP ............................................................................11-33
SECTION 12 – FINANCIAL CAPABILITY...............................................................................12-1
12.1 INTRODUCTION ...................................................................................................12-1
12.2 METHODOLOGY ..................................................................................................12-1
12.3 RESIDENTIAL INDICATOR.................................................................................12-2
12.3.1 Median Incomes ..........................................................................................12-2
12.3.2 Lower Incomes ............................................................................................12-4
12.4 FINANCIAL CAPABILITY INDICATORS ..........................................................12-6
12.4.1 General ........................................................................................................12-6
12.4.2 Bond Ratings ...............................................................................................12-6
12.4.3 Summary of Financial Capability Indicators...............................................12-6
12.5 COMBINED RESIDENTIAL AND FINANCIAL INDICATORS........................12-7
12.6 OTHER FACTORS ...............................................................................................12-10
12.6.1 Baseline Rate Impacts Facing WASA’s Rate Payers................................12-10
12.6.2 Substantial Rate Increases Required to Fund LTCP .................................12-12
12.6.3 True Affordability Measure – Impact on Annual Household Budgets .....12-12
12.6.4 High Degree of Uncertainty in Rate Impacts Should be Considered........12-16
12.6.5 Effect of Federal Funding on Rate Increases ............................................12-18
SECTION 13 – RECOMMENDED CONTROL PROGRAM ...................................................13-1
13.1 INTRODUCTION ...................................................................................................13-1
13.2 RECOMMENDED CONTROL PROGRAM..........................................................13-1
13.2.1 System Wide Controls: Low Impact Development-Retrofit .......................13-4
13.2.2 Anacostia River Components......................................................................13-9
13.2.3 Rock Creek Components...........................................................................13-10
13.2.4 Potomac River Components......................................................................13-10
13.2.5 Blue Plains Wastewater Treatment Plant Components .............................13-11
13.2.6 Permit and Land Requirements .................................................................13-12
13.2.7 Expandability ............................................................................................13-13
13.2.8 Other Activities Benefiting CSO Control..................................................13-14
13.3 BENEFITS OF RECOMMENDED CONTROL PROGRAM..............................13-16
13.3.1 CSO Overflow Reduction..........................................................................13-16
13.3.2 Outfall Elimination....................................................................................13-17
13.3.3 Water Quality ............................................................................................13-18
13.3.4 Solids and Floatables Control....................................................................13-22
13.4 COMPARISON OF FINAL LTCP TO DRAFT LTCP.........................................13-23
13.5 FINANCIAL IMPACTS........................................................................................13-24
13.6 SCHEDULE...........................................................................................................13-28
13.7 BASES FOR LTCP DEVELOPMENT AND
IMPLEMENTATION SCHEDULE .........................................................13-29
13.8 CSO REDUCTION VERSUS TIME.....................................................................13-35
J:\1160\LTCP\LTCP Final\toc.doc v FINAL - July 2002