Combined Sewer System Long Term Control Plan - DC Water

District of Columbia Water and Sewer Authority
Combined Sewer System Long Term Control Plan
Figure B-23
Anacostia River: Effect of CSO Control on Fecal Coliform Concentrations
(Upstream and Stormwater Load Reduction 1 )
E. Coli - # of Days Exceeding 576/100 mL
No Phase 1 Controls Phase 1 Controls Flow Pump Sta. Rehab. 12 Overflows/yr 8 Overflows/yr
4 Overflows/yr 2 Overflows/yr 0 Overflows/yr Separation
ENTIRE CALENDAR YEAR
# of days/yr
180
160
140
120
100
80
60
40
20
0
Haines Point South Capital St. Navy Yard RFK Stadium DC/MD Boundary
Confluence NE &
NW Branch
No Phase 1 Controls 51 128 159 164 32 14
Phase 1 Controls 31 77 86 79 31 14
Pump Sta. Rehab. 20 71 84 77 31 14
12 Overflows/yr 10 40 43 52 30 14
8 Overflows/yr 3 23 29 44 30 14
4 Overflows/yr 1 12 19 40 29 14
2 Overflows/yr 0 2 12 37 29 14
0 Overflows/yr 0 0 10 36 29 14
Separation 0 43 58 89 30 14
E. Coli - # of Days Exceeding 576/100 mL
No Phase 1 Controls Phase 1 Controls Pump Sta. Rehab. 12 Overflows/yr 8 Overflows/yr
4 Overflows/yr 2 Overflows/yr 0 Overflows/yr Separation
80
70
60
MAY THROUGH SEPTEMBER
# of days/yr
50
40
30
20
10
0
Haines Point South Capital St. Navy Yard RFK Stadium DC/MD Boundary
Confluence NE &
NW Branch
No Phase 1 Controls 23 54 64 71 14 7
Phase 1 Controls 14 39 42 38 13 7
Pump Sta. Rehab. 9 35 42 37 13 7
12 Overflows/yr 3 18 20 21 13 7
8 Overflows/yr 2 11 13 18 13 7
4 Overflows/yr 1 7 8 15 12 7
2 Overflows/yr 0 1 4 14 12 7
0 Overflows/yr 0 0 2 13 12 7
Separation 0 19 Flow
22 36 13 7
J:\1160\LTCP\LTCP Final Draft #2 (Board)\App B-Ana WQ\[Fib B-15xls.xls]21
1 Storm water: 40% reduction in loads, Upstream: 40% reduction in nutrients
Fecal coliforms at 80% of water quality standard (concentration = 160/100 ml)