Combined Sewer System Long Term Control Plan - DC Water

Post Construction Monitoring
o Combined sewer flow is being transferred from the individual outfall to the
appropriate storage facility at prescribed rates; and
o The associated wastewater pumping stations are operating at their maximum practical
capacity; and
o The Blue Plains Wastewater Treatment Plant (BPWWTP) is providing treatment for
flows conveyed to the plant as specified below.
Combined sewer overflow storage capacity shall be not less than the following:
o Anacostia River System – 126 million gallons.
o Potomac River System – 58 million gallons.
o Piney Branch Storage Tunnel – 9.5 million gallons
Transfer rates from combined sewer outfalls to storage facilities shall be not less than the
rates listed in Table 15-4
Table 15-4
Minimum Diversion Capacities to Storage for Recommended LTCP
Minimum Diversion
Capacity Required for
CSO Outfall
Drainage Area
CSO Control(mgd)
Anacostia CSOs
005 Fort Stanton 37
006 Fort Stanton Proposed to be separated
007 Fort Stanton 111
009 Canal Street 36
010 B St./N.J. Ave 690
011 B St./N.J. Ave 460
012 Tiber Creek 471
013 Canal Street Sewer 18
014 Navy Yard/M St.: 6 th St – 7 th St 92
015 Navy Yard/9 th St-M St. 11
016 1 Navy Yard/M St.: 12 th St.– 9 th St. 86
017 1 Navy Yard/M St.: 14 th to Penn Ave. 65
018 1 Barney Circle 57
019 Northeast Boundary 1,460
Potomac CSOs
020 Easby Point 297
021 Slash Run 530
022 I St.- 22 nd St., NW 333
023/24 1 West of Rock Creek Diversion Sewer 66
025 1 31 st & K St NW 3
026 1 Water St District (WRC) 0
027 1 Georgetown 92
028 1 37 th St-Georgetown 9
\\Gh-wash\ENG 1160\LTCP\LTCP Final\Sec 15.doc 15-8 FINAL - July 2002