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Transcription

QUARTERLY OPERATIONS REPORT
DISTRICT OF COLUMBIA
COMBINED SEWER OVERFLOW FACILITIES
SECOND QUARTER, 2016
Prepared By:
D.C. Water and Sewer Authority
Department of Sewer Services
2nd & N Streets, SE
Washington, D.C. 20003
WATER AND SEWER AUTHORITY
Serving the Public • Protecting the Environment
Monthly Operations Report
For
Combined Sewer System
Month: April 2016
Prepared By:
District of Columbia
Water and Sewer Authority
Washington,
1 D.C. 20003
Washington, D.C.
Monthly Operations Report for Combined Sewer System
Month: April 2016
Table of Contents
1.
INTRODUCTION
2.
OPERATION AND MAINTENANCE
2.1
Regulators
2.2
Outfalls, Tide Gates and CSO Signs
2.3
Pumping Stations
2.4
Northeast Boundary Swirl Facility
2.5
Inflatable Dams
3.
DRY WEATHER OVERFLOWS
4.
SOLIDS AND FLOATABLES CONTROL
4.1
Catch Basin Cleaning
4.2
BMP Demonstration Projects
4.3
Skimmer Boat Programs
4.4
CSS Litter Control
5.
MONITORING
5.1
Bar Racks at Main & O Street
5.2
Rainfall Data
2
1.
INTRODUCTION
The District of Columbia Water and Sewer Authority (DC Water) operates a wastewater collection system comprised of separate and combined sewers.
Separate storm and sanitary sewers serve parts of the District. In the combined sewer system (CSS), there is a single sewer to convey storm water and
sanitary wastes. The area served by combined sewers comprises about one-third of the District.
During dry weather, sanitary wastes collected in the CSS are conveyed to the DC Water’s wastewater treatment plant at Blue Plains (BPWWTP or the
Blue Plains WWTP). During periods of rainfall, the capacity of a combined sewer may be exceeded and the excess flow, which is a mixture of storm
water and sanitary wastes, is discharged directly to the Anacostia River, Rock Creek or the Potomac River or their tributary waters. This report summarizes
the operations of the combined sewer system for the month indicated.
2.
OPERATION AND MAINTENACE
2.1
Regulators
Regulators divert combined sewage to interceptors, which convey flow to BPWWTP for treatment. When flows exceed the capacities of the systems
such as during significant rain events, regulators divert excess flow to CSO outfalls which discharge to receiving waters. The following table summarizes
inspections of CSO regulators in the collection system.
Table 2-1
Regulator Structures
Structure
Number
2
4
5
6
7
81
9
11
12
13
14
15
Location
Bolling AFB, 2250 ft. north of the south line of the Base, SW
Poplar Point Pumping Station
Chicago Street and Railroad Ave, SE
W Street and Railroad Ave, SE
Good Hope Rd, west of Nichols Ave, SE
13th Street and Ridge Place, SE
"O" Street Pumping Station
Storm Pump Discharge at Main Pumping Station
2nd Street, 300 ft. north of N Place, SE
South Capitol and E Streets
Condition
Associated NPDES
Date
Needs
Outfall
Inspected Good Work
003
*
04/13/16
003
*
04/13/16
004
*
04/18/16
005
*
04/04/16
005
*
04/04/16
006
N/A
007
*
04/04/16
011(a)
011
009
011(a)
010
3
04/22/16
04/13/16
04/08/16
04/08/16
04/14/16
*
*
*
*
*
Work Needed
Work performed
Structure
Number
Location
15a
15b
15c
16
17
17a
18
19
19a
Half and L Streets, SE
South Capitol and I Streets
North of Main Sewage Pumping Station
4th and N Streets, SE, Both Extended
K Street between 6th Street and 7th Street, SE
6th and M Streets, SE
20
20a
21
22a
22b
22c
22d
22e
23
24a
28
29
30
31
33
34
34a
35
Barney Circle and Pennsylvania Ave, SE
Kentucky Ave and Potomac Street, SE
14th Street and Kentucky Ave, SE
Independence Ave, 21st Street, SE, Extended
East Capitol St, west of RFK stadium
21st and Constitution Ave, NW
22nd Street, between Constitution Ave and C St, NW
17th and D Streets, NW
15th Street and Pennsylvania Ave, NW
10th and F Streets, NW
23rd Street, north of Constitution Ave, NW
23rd Street near C Street, NW
Northeast of Roosevelt Bridge, NW
Condition
Associated NPDES
Date
Needs
Outfall
Inspected Good Work
010
010
010
012
013
013
014
015
015
016
016
017
018
018
018
018
018
019
019
020
020
020
020
020
020
020
04/14/16
04/05/16
04/05/16
04/08/16
04/08/16
04/08/16
04/01/16
04/04/16
04/04/16
04/04/16
04/04/16
04/04/16
04/01/16
04/01/16
04/01/16
04/01/16
04/01/16
04/05/16
04/05/16
04/15/16
04/15/16
04/05/16
04/05/16
04/05/16
04/14/16
04/15/16
Work Needed
Work performed
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
16-265684 No Access due
to construction in vicinity
of structure. The
021
4
Kennedy Center
contractor is
constructing a platform
Structure
Number
Location
Condition
Associated NPDES
Date
Needs
Outfall
Inspected Good Work
Work Needed
Work performed
to provide access by
July
36
36a
36b
36d
36g
36h
37
38
38a
39a
39b
41b
41c
42
43
43a
44
45
46
47
47a
47b
47c
491
50
51
52
52a
53
53a
27th and I Streets, NW
New Hampshire Ave and Eye Street, NW
19th and L Streets, NW
18th and M Streets, NW
27th and Eye Streets, NW
29th and K Streets, NW
30th Street, south of K Street, NW
31st and K Streets, NW
Wisconsin Ave and K Street, NW
Potomac and Water Streets, NW
Water Street, west of Potomac St, NW
Canal Rd, 1000ft. east of Foxhall Rd, NW
38th Street and Reservoir Road, NW
37th and T Streets, NW
38th and W Streets, NW
Pennsylvania Ave, east side of Rock Creek, NW
26 and M Streets, NW
N Street Extended, west of 25th Street, NW
22nd Street between M and N Streets, NW
N Street between 22nd and 23rd Streets, NW
22nd and M Streets, NW
022
022
022, 034
022, 034
022, 034
022, 034
022
024
024
024
024
025
025
026
027
027
027
028
029
029
029
029
029
031
032
033
034
034
022, 034
022, 034
5
04/05/16
04/05/16
04/08/16
04/08/16
04/08/16
04/08/16
04/05/16
04/04/16
04/04/16
04/04/16
04/04/16
04/04/16
04/04/16
04/08/16
04/08/16
04/08/16
04/08/16
04/01/16
04/01/16
04/01/16
04/01/16
04/01/16
04/01/16
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
N/A
04/11/16
04/11/16
04/14/16
04/15/16
04/15/16
04/15/16
*
*
*
*
*
*
Structure
Number
Location
53b
53c
54
55
55a
56
57
581
59
60
61
62
63
64
65
65a
66
67
68
69
L Street between 21st Street and New Hampshire Ave, NW
L and 22nd Streets, NW
23rd and O Streets, NW
22nd Street, south of Q Street, NW
23rd and Massachusetts Ave, NW
23rd Street, south of Q Street, NW
Northwest of Belmont Road and Rock Creek and Potomac Parkway, NW
North of Belmont Rd, east of Kalorama Cir, NW
Connecticut Ave, east of Rock Creek, NW
Biltmore St, Extended, east of Rock Creek, NW
Ontario Rd, Extended, and Rock Creek Pkwy, NW
Harvard Street and Rock Creek Parkway, NW
Adams Mill Road, south of Irving Street, NW
Kenyon Street and Adams Mill Road, NW
Adams Mill Road and Lamont Street, NW
Park Rd , south of Piney Branch Pkwy, NW
Ingleside Terrance, Extended and Piney Branch Parkway, NW
Mt. Pleasant Street, Extended and Piney Branch Parkway, NW
70
70i
71
72
72a
73
741
75
77
77a
781
Condition
Associated NPDES
Date
Needs
Outfall
Inspected Good Work
022, 034
022
034
035
035
036
036
037
038
039
040
041
042
043
044
044
045
046
047
048
049
049
050
051
051
052
053
054
056
056
057
th
Piney Branch Parkway, west of 16 Street, NW
5th and Quackenbos Streets, NW
28th Street, west of Rock Creek Parkway, NW
Olive Street Extended and Rock Creek Pkwy, NW
O Street Extended and Rock Creek Parkway, NW
Q Street, west of Rock Creek, NW
West side of Rock Creek, 300 ft. south of Massachusetts Ave, NW
Normanstone Dr Extended, west of Rock Creek, NW
Normanstone Dr and Normanstone Lane, NW
28th Street Extended, west of Rock Creek, NW
6
04/08/16
04/08/16
04/11/16
04/11/16
04/11/16
04/11/16
04/11/16
*
*
*
*
*
*
*
N/A
04/01/16
04/01/16
04/01/16
04/06/16
04/06/16
04/06/16
04/06/16
04/06/16
04/06/16
04/06/16
04/06/16
04/06/16
*
*
*
*
*
*
*
*
*
*
*
*
04/06/16
04/05/16
04/12/16
04/11/16
04/11/16
04/11/16
*
*
*
*
*
*
N/A
04/12/16
04/12/16
04/12/16
N/A
*
*
*
Work Needed
Work performed
Structure
Number
791
84
84a
Location
Connecticut Ave and Rock Creek Parkway, NW
26th and P Streets, NW
Condition
Associated NPDES
Date
Needs
Outfall
Inspected Good Work
N/A
058
060
060
04/11/16
04/11/16
Work Needed
Work performed
*
*
Notes:
1. Structure no longer functions as a combined sewer overflow regulator structure.
2. Where construction is indicated to be in progress at a regulator, the contractor maintains flow (i.e. prevents DWO) during construction by flow
diversion, bypass pumping, fluming, sandbagging or other means.
2.2
The following table summarizes inspections, maintenance and work performed on outfall structures, tide gates and CSO signs in the collection system.
Table 2-2
Outfalls and Tide Gates
NPDES
Outfall
003
005
0061
007
009
010
011
011(a)
012
013
014
Location
Bolling Air Force Base, at Giavanolli and Chanute, SW
Across from Navy Yard, aligned with Parsons Ave., SE
Good Hope Road and Welsh Memorial Bridge
Between 11th St. and Anacostia Bridges, SE
O St. Sewage Pumping Station, SE
Main Sewage Pumping Station, SE
Southeast Federal Center, aligned with 4th St.
Navy Yard, aligned with 6th St., SE
Tide
Outfall
Gate
Tide Gate
Condition Present? Condition CSO Sign
Date
Needs
Needs
Needs
Inspected OK Work Yes No OK Work OK Work Notes, Work Needed or Performed
04/13/16
*
*
*
*
04/15/16
*
*
*
*
N/A
04/15/16
04/13/16
04/13/16
04/13/16
04/13/16
04/13/16
04/13/16
04/13/16
7
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
NPDES
Outfall
015
016
017
018
019
020
021
022
024
025
026
027
028
029
0311
032
033
034
035
036
0371
038
039
040
041
042
043
044
Location
Navy Yard, aligned with 9th Street, SE
12th and O Streets, SE
M and Water Street, SE
East of Barney Circle & South of Pennsylvania Avenue Bridge, SE
Adjacent to Service Drive behind swirl facility & D.C. General
Hospital
Rock Creek Parkway and Independence, NW
Rock Creek Parkway and C St., NW
Rock Creek Parkway and G St., NW
South of 30th and K Streets, NW1
South of 31st and K Streets, NW
Wisconsin Avenue and Water Street, NW
33rd and Water Sts., NW
Key Bridge and Whitehurst Freeway, NW
Adjacent to C&O Canal, aligned with 38th St. NW
Rock Creek Pkwy & Pennsylvania Avenue, NW
26th and M Street, NW.
Across street from St. Francis Jr. High and aligned with N St., NW.
Just west of St. Francis Jr. High and north of N St., NW
P St. Bridge and Rock Creek Parkway
22nd Street, South of Q Street NW.
Waterside Dr. and Rock Creek Parkway
Between arch footbridge and Connecticut Ave., north of Kalorama
Circle, NW.
Connecticut Avenue Bridge and Rock Creek Parkway, NW.
Aligned with Biltmore Rd., between Connecticut Ave and
Ellington Bridge.
Beach Dr. and Ontario Pl., NW
Harvard St. and Beach Dr NW.
Upstream of Harvard St. and Beach Dr NW.
Kenyon Street and Beach Dr., NW.
Tide
Outfall
Gate
Tide Gate
Date
Needs
Needs
Needs
04/13/16
*
*
*
04/12/16
*
*
*
*
04/12/16
*
*
*
*
04/12/16
*
*
*
*
04/05/16
*
*
*
*
04/07/16
*
*
*
*
04/17/16
*
*
*
*
04/07/16
*
*
*
*
04/07/16
*
*
*
*
04/07/16
*
*
*
*
04/07/16
*
*
*
*
04/07/16
*
*
*
04/07/16
*
*
*
04/07/16
*
*
*
N/A
04/11/16
04/11/16
04/11/16
04/11/16
04/12/16
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
04/01/16
04/01/16
*
*
*
*
*
*
*
*
04/13/16
04/13/13
04/13/16
04/13/16
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
N/A
04/01/16
8
Tide
Outfall
Gate
Tide Gate
Date
Needs
Needs
Needs
04/13/16
*
*
*
*
04/06/16
*
*
*
04/06/16
*
*
*
*
04/06/16
*
*
*
*
NPDES
Outfall
Location
045 North of Beach Dr. and Walbridge Pl, NW.
046 Piney Branch Parkway and Park Road, NW.
047 Piney Branch Parkway and Ingleside Terrace
048
049
050
051
South of Piney Branch Parkway and 17th St.
North of Piney Branch Parkway and 17th St.
Rock Creek Parkway and L St., NW
Across Rock Creek Pkwy, aligned with Olive St., NW.
04/06/16
04/12/16
04/19/16
04/19/16
052 Between P & Penna. Ave Bridges, aligned with O Street, NW.
0531 Q St. Bridge and Rock Creek Parkway, NW.
054 Massachusetts Ave & Rock Creek Parkway, NW.
056 Normanstone Dr. and Rock Creek Parkway, NW.
0571 28th Street and Rock Creek Parkway, NW
0581 Connecticut Ave & Rock Creek Parkway, NW.
060 North of P St. Bridge & Rock Creek Pkwy, NW
Notes:
1. Outfall no longer functions as a combined sewer outfall.
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
N/A
04/12/16
04/12/16
N/A
N/A
04/12/16
2.3
Pumping Stations
Pumping station operations are summarized in the table below.
Table 2-3
Pumping Stations – Inspections and Equipment in Service
Pumping
Station
Main
No. of
No.
No.
Screens or Pumps
Inspections Screens Pumps
Out of Service
30
3
6
Screen #4
Pump #3
Eastside
3
2
4
Screen #1
Pump #1
Poplar Point
3
3
3
Screen #2
Potomac
30
4
5
Pump #5
Dates
04/01/16-04/30/16
04/01/16-04/30/16
04/01/16-04/30/16
04/01/16-04/30/16
04/01/16-04/30/16
04/01/16-04/30/16
9
Reason
Screen repair
Contractor rehab
Screen repair
Pump repair
Screen repair
Potomac rehab work –
Phase 3 Contractor
Responsibility
Work Order
Number
Schedule to Restore to Service1
16-235069
07/31/16
16-76407
16-248765
16-163875
05/14/16
06/15/16
07/15/16
06/06/16
Notes:
1.
The schedule to restore to service is impacted by the type and age of equipment. In some cases, the condition of equipment and the lack of
availability of replacement parts necessitate complete replacement of the unit or element or custom fabrication of needed parts to return the units to
service. For these and other reasons, projects are underway for the rehabilitation of the pumping stations.
Table 2-4
Pumping Stations – Preventive Maintenance
Type of Preventive Maintenance
Work Order
Pumping Station
Date Performed
Performed1
Number
Comments
Main
04/01/16
Group A
16-260519
Add oil, grease bearings and replace packing if needed.
O St
04/01/16
Group A
16-252417
Eastside
04/02/16
Group A
16-281452
Poplar Point
04/02/16
Group A
16-257059
Potomac
04/01/16
Group A
16-281630
Rock Creek
04/02/16
Group A
16-276130
Upper Anacostia
04/02/16
Group A
16-260533
Earl Place
04/02/16
Group A
16-295522
Notes:
1. Group A consists of:
Exercise bar screens
Exercise all sump pumps
Drain condensation from air compressor storage tank
Check depth of screening in the screen room and schedule Vactor truck as required
Check all safety equipment
Issue work order requests as required
Table 2-5
Pumping Stations – Pumpage
Pumping Station
Main
O St
Eastside
Poplar Point
Potomac
Rock Creek
Upper Anacostia
Earl Place
Sanitary Pumpage
Total Wastewater
Daily Average
(mg)
Wastewater (mg)
2147.50
71.58
105.30
3.51
137.41
4.58
503.65
16.79
3182.02
106.07
138.08
4.60
34.58
1.15
0.152
0.005
Storm Water/CSO Pumped To Anacostia River
Screenings Collected
Date
Volume (mg)
(units)1
N/A
N/A
N/A
04/07/16
11.13
Normal
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Notes:
1. Screening consists of vertical trash racks, with no mechanical cleaning. Quantification of captured materials is not possible on monthly basis.
10
2.4
The Northeast Boundary Swirl Facility provides screening, swirl concentration, chlorination and dechlorination of CSO overflow from CSO 019. The
capacity of the facility is 400 MGD. Facility operations are summarized below:
Table 2-6
Northeast Boundary Swirl Facility – Inspections and Equipment in Service
Date
Inspected
04/07/16
No.
Screens
3
No.
Swirls
3
Screens or Swirls
Out of Service
N/A
Dates
N/A
Reason
Schedule to Restore to Service
Table 2-7
Northeast Boundary Swirl Facility – Preventive Maintenance
Date Performed
04/07/16
Type of Preventive Maintenance Performed1
Work Order Number
16-286429
Group A
Comments
Notes:
Exercise wash down system
Exercise knife gates full travel both directions
Check depth of grit in grit channel and schedule Vactor truck as required
Change chart paper on strip chart recorders at the end of each month
Thoroughly clean each Swirl tank and channels
Drain condensation from air compress
Table 2-8
Northeast Boundary Swirl Facility – Wet Weather Operations
Date
04/07/16
04/23/16
04/28/16
Approx. Storm
Duration (hrs)1
4.5
1
5
Total Influent
Volume (mg)
17.49
0.29
8.49
Total Foul Sewer
Volume (mg)
7.38
0.29
4.50
Total Effluent
Volume (mg)
10.11
0
3.99
Approx. Screenings
Volume (Cu. ft)
72
40
36
Notes:
1.
Approx. length of time influent flow rate was above the 15 mgd threshold for allowing flow through the facility.
11
Chlorination/Dechlorination Systems
The table below summarizes the information about the operation of Swirl Facility chlorination and dechlorination systems during storm events.
The chlorination feed system was not activated during the storm events in which flows were 15 mgd or greater due to a breakdown in our system of
internal controls concerning the supply of Sodium Hypochlorite. This problem was corrected on July 26, 2016. DC Water is assessing its systems of
controls to prevent a reoccurrence. We have taken interim measures to ensure the availability of Sodium Hypochlorite at all times to ensure compliance
with the NPDES permit while we continue our assessment. All other chemical feed systems were not activated during these storm events. Included
in the table are results of residual chlorine, enterococcus and fecal coliform testing for samples taken in the Swirl Facility mix chamber and at the
facility effluent outfall to the Anacostia River.
Grab samples for residual chlorine are taken and immediately tested with a portable analyzing kit. Samples for fecal coliform and enterococcus are
taken from the designated sample point, treated with sodium bisulfate to remove any residual chlorine, and conveyed to the Blue Plains Wastewater
Treatment Plant Laboratory for testing.
Table 2-9
Northeast Boundary Swirl Facility – Disinfection Performance
Date
04/07/16
Dosages
Chlor/
Dechlor
System NaOCl NaHSO3
Used? (mg/l)
(mg/l)
No2
0
0
Residual Chlorine Test
Results
Location
Mix Chamber
Anacostia River1
Notes:
1. River: River Outfall
2. The chlorination system was required but not operational during the storm event.
12
Conc.
(mg/l)
0.0
0.0
E. Coli Test Results
Count
Per
Site
100ml
Mix Chamber
66,000
Anacostia River1
60,000
Table 2-10
Northeast Boundary Swirl Facility – Effluent Sampling Results
Flow Composited Sample Results
Date
4/07/16
Total suspended
solids (mg/L)
258
Nitrite
(NO2-N)
mg/L
0.08
Nitrate
(NO3-N))
mg/L
0.34
Total Kjeldahl
Nitrogen
(mg/L as N)
7.65
13
Total Nitrogen
(mg/L)
8.07
Total
Phosphorus
(mg/L)
1.07
Carbonaceous
Biological Oxygen
Demand (mg/L)
71.9
2.5 Inflatable Dams
DC Water operates and maintains twelve inflatable dams at eight different locations. The structure number, location and number of dams per site are
presented in Table 2-11. The inflatable dams consist of multi-ply elastomeric (i.e., “rubber”) fabric dams installed in major overflow conduits within the
combined sewer system. The objective of the inflatable dam installation is to increase the effective depth to which the sewage must rise in the combined
sewer before overflows occur. The effect of the installation is to retain a greater volume of combined sewage flow resulting from low to moderate intensity
storms by maximizing storage within the CSS. During higher intensity storms, when the full carrying capacity of the overflow conduit is required to
prevent upstream flooding, the dam is deflated automatically. Inflatable dam operations are summarized below:
Table 2-11
Inflatable Dams – Inspections and Equipment in Service
Inflatable Dam
Structure No
14 - East
14 - West
15
15A
16 - East
16 - West
24 - North
24 - Middle
24 - South
34
35
52
Date Inspected
Was Dam Out of Service
During the Month?
Dates out of Service
Reason
04/14/16
04/14/16
04/14/16
04/14/16
04/14/16
04/14/16
04/14/16
04/14/16
04/14/16
04/14/16
04/30/161
No
No
No
No
No
No
No
No
No
No
Yes
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
04/14/16-04/21/16
04/14/16
No
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Power Cable Damage
Compressor Repair
N/A
Schedule to Restore to
Service
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
04/21/16
N/A
Notes:
1. Due to ongoing construction activity at the Kennedy Center, sewer access to Inflatable Dam structure 35 is considered unsafe by the DC Water
Department of Safety and Health. The control vault and equipment were inspected during April prior to the entry conditions becoming hazardous. The
Kennedy Center’s Contractor is constructing a platform to provide access during construction of the Kennedy Center’s Expansion Project.
On 04/04/16 and 04/06/16, Inflatable Dam structure 14 experienced temporary deflations due to the level sensor being disturbed by cleaning contractors
entering and exiting the sewer.
On 04/14/16, power was lost at Inflatable Dam structure 35 after it was damaged by construction contractors not affiliated with DC Water. During this
time, repairs were made to the air compressor. The dam was returned to service on 04/21/16. Structure 35 also experienced temporary deflations on
04/26/16 during dry weather.
In all instances, there were no flow conditions at the structures during these times capable of overflowing to the outfall.
14
Table 2-12
Inflatable Dams & SCADA Sites - Wet Weather Operations
Inflatable Dam Structure No.
14 (E & W)
15
15A
16 (E & W)
24
34
35
52
Overflow Dates
None
None
04/07/16
None
04/07/16
None
04/07/16
None
Estimated Duration of Overflow
N/A
N/A
1hr 53mins
N/A
14 mins
N/A
1 min
N/A
Structures on Outfall Sewers
Outfall Structure 1
Outfall Structure 1A
Outfall Structure 2
Outfall Sewer Control Gates
Outfall Sewer Control Gate No.1
Overflow Dates
None
None
None
Operational Status
Operational
Operational
This structure has been bulk headed. Overflows are no longer possible.
None
Position
Open
This structure has been bulk headed. Overflows are no longer possible
15
3.
There was no dry weather combined sewer overflow during April 2016.
Sanitary Sewer Overflows:
Location 141 Chesapeake St SW
DC Water received a service call regarding a sewer customer complaint at 141 Chesapeake St SW
Cause regarding a sewer backup in home.
Date/ Time Discovered April 5, 2016 at approximately 8:20 PM
Action Taken The crew cleared the grease buildup in the line.
Date/Time Discharge Ceased April 5, 2016 9:30 PM
Estimated Volume 20 gallons.
Did Overflow Reach Receiving water? No
A closed circuit television evaluation will be performed to ascertain if further action is needed to prevent a
Action taken to prevent reoccurrence recurrence.
Location Naylor Road and Southern Avenue SE
DC Water received a service call regarding a sewage flowing from Naylor Garden Apartments towards the
3600 Block of Naylor Road, SE. The DSS maintenance crew found an overflowing manhole in a wooded
Cause area near Naylor Road and Southern Ave SE.
Date/ Time Discovered April 26, 2016 at approximately 9:51 AM
The crew was unable to clear the 10 inch sanitary sewer to stop the overflow. DC Water directed Anchor
Contracting to the site to set up a by-pass pumping operation around the blockage in the pipeline. Anchor
completed the installation of the temporary piping to effectively stop all flow for the sanitary sewer into
Action Taken the stream
Date/Time Discharge Ceased April 26, 2016 at approximately 9:00 PM
Estimated Volume 10,000 gallons.
Did Overflow Reach Receiving water? Yes
A closed circuit television evaluation confirmed a collapse in the 10 inch sanitary sewer. Anchor will
Action taken to prevent reoccurrence remain on site to replace all defective pipe to prevent occurrence.
16
4.
4.1
The following tables summarize catch basin cleaning in the Anacostia CSO area and in the entire sewer system:
Total CBs
1468
2917
CBs in
CSS
1451
2855
CBs in
Anacostia
CSS
661
606
3483
3329
3832
3478
3428
169
1649
1800
3058
48
0
0
1742
3050
48
8
2621
268
Subtotal
DDOT (via VMS)
Subtotal
Grand Total
% Cleaned/Inspected
to Date
24556
24556
Ward
1
2
3
4
5
6
7
Inspections
Total
Total
Anacostia Anacostia
CBs
CBs
Inspected
Inspected
Once this Twice this
Year
Year
99
3
353
45
0
0
0
0
158
4
Cleaning
CBs Cleaned Thru
Last Month
CB’s Cleaned
This Month
Total CBs Cleaned
This Year to Date
Total
102
438
170
79
In CSS
102
361
0
34
Total
28
105
23
37
In CSS
28
105
6
15
Total
130
543
193
116
In CSS
130
466
6
49
1499
0
61
0
1273
1559
3507
162
1288
0
40
231
268
28
198
0
1313
1790
3775
190
1486
0
268
150
2
72
55
1898
95
1970
150
11298
6375
2259
115
7200
2002
2630
475
9830
2477
11298
6375
2259
115
7200
2002
2630
475
9830
2477
29%
18%
40%
22%
35%
Totals have been updated per Ward due to data updates
17
4.2
DC WATER operates the following demonstration projects designed to remove solids and floatables from CSO prior to discharge.
 Netting system at CSO 018 to Anacostia River
 Bar Rack at CSO 040 and 041 to Rock Creek
Table 3-2
BMP Demonstration Projects – Report
Facility
Netting System CSO 018
Date
Inspected
4/21/2016
Good
Bar Rack CSO 040
Bar Rack CSO 041
4/1/2016
4/13/2016
Good
Good
Condition
Work Needed
Routine
Cleaning
None
None
Notes:
(1) System is designed such that captured solids and floatable are conveyed to Blue Plains for treatment.
18
Work performed
Routine Cleaning
Material Removed
(CY)
None.
Routine Cleaning
Routine Cleaning
(1)
(1)
4.3
Anacostia River Floating Debris Removal Program
This program was initiated in October 1992 to remove floating debris from Anacostia and Potomac Rivers on a routine basis. The program has
continued from that time and is now under the auspices of DC WATER, Department of Sewer Services. The floating debris removal program
utilizes a skimmer boat and support boats to remove floatable debris from the Rivers as well as trash, which accumulates on the riverbanks and
in the mud flats at low tides. Work for the most part is directed toward the Anacostia River. The boats pick up debris five days a week.
Operations are summarized as follows:
Table 3-3
Anacostia River Floating Debris Removal Program – Summary
Program Operation
Work Days this month:
Days not Operating
Reason not Operating
# Skimmer in Fleet
# Skimmers Out of Service
Dates
Reason
5-day work week, excluding holidays, weather permitting
22
6
Environmental
3 Skimmers
1 Skimmer
B28: 4/1 - 4/30 B29: 4/14 - 4/21 & 4/26
B28: Front assembly catching on hull.
B29: Number one screen jammed.
Plan to Restore to Service B28: Sent to contractors for repair, ETR unknown.
B29: Returned to operation 4/22 and 4/27.
Volume Material Collected 50 tons.
Nature of Material Bottles, cans, natural debris and plastics.
4.4
CSS Litter Control
This section describes DC WATER’s efforts to coordinate litter control efforts with the National Park Service and D.C. Department of Public
Works to maximize litter control efforts in the combined sewer system.
Status: no activities this month.
19
5.
MONITORING
5.1
Condition Report Bar Racks at Main and O Street Storm Pumps
DC Water performs visual surveys of the bar racks at Main and O Street Pumping Stations to characterize the quantity and nature of floatable
discharge. The physical condition of the bar racks and any maintenance requirements are also noted.
Table 5-1
Bar Racks at Main & O Street Pumping Stations
Inspector: Wayne Reed
Pumping Station
Bar Racks at O
Street Storm
Pumps (CSO 010)
Bar Racks at Main
Storm Pumps
(CSO 011)
Condition
Needs
Good
Work
Inspector
Date
Inspected
WR
04/01/2016
X
WR
04/01/2016
X
20
Work Needed
Work Performed
or Schedule for
Completion
5.2 Rain Data
Rain data from National Airport and from the rain gauges installed in the CSS are summarized below.
Date
4/1/2016
4/2/2016
4/3/2016
4/4/2016
4/5/2016
4/6/2016
4/7/2016
4/8/2016
4/9/2016
4/10/2016
4/11/2016
4/12/2016
4/13/2016
4/14/2016
4/15/2016
4/16/2016
4/17/2016
4/18/2016
4/19/2016
4/20/2016
4/21/2016
4/22/2016
4/23/2016
4/24/2016
4/25/2016
4/26/2016
4/27/2016
4/28/2016
4/29/2016
4/30/2016
TOTAL
Brentwood
Pumping
Bryant Street
Pumping Station
Main Pumping
Station
Rock Creek
Pumping Station
National Airport
0.03
0.13
0.01
0
0
0
0.71
0
0.18
0
0.01
0.07
0
0
0
0
0
0
0
0
0
0
0.20
0
0
0
0.05
0.52
0.02
0.01
1.94
0.02
0.16
0
0.06
0
0
0.89
0
0.15
0
0.01
0.06
0
0
0
0
0
0
0
0
0
0
0.18
0
0
0
0.03
0.57
0
0.01
2.14
0.03
0.11
0.01
0.06
0
0
0.57
0
0.12
0
0.01
0.02
0
0
0
0
0
0
0
0
0
0
0.19
0
0
0
0.02
0.50
0.01
0
1.65
0.03
0.04
0
0
0
0.01
0.87
0
0.12
0
0.01
0.07
0
0
0
0
0
0
0
0
0
0
0.25
0
0
0
0.02
0.51
0
0.02
1.95
0.05
0.10
0
0.07
0
0
0.70
0
0.17
0
0.01
0.05
0
0
0
0
0
0
0
0
0
0
0.26
0
0
0
0.03
0.58
0.01
0.02
2.05
I:\SEWER\CSO QUARTERLY REPORT\CSO 2nd Quarter Report 2016\CSO Quarterly Revised\CSO Monthly Report April 2016finall7.docx
21
For
Month: May 2016
Prepared By:
1
Washington, D.C.
Month: May 2016
Table of Contents
1.
INTRODUCTION
2.
2.1
Regulators
2.2
2.3
Pumping Stations
2.4
2.5
Inflatable Dams
3.
4.
4.1
4.2
4.3
4.4
CSS Litter Control
5.
MONITORING
5.1
5.2
Rainfall Data
2
1.
INTRODUCTION
The District of Columbia Water and Sewer Authority (DC Water) operates a wastewater collection system comprised of separate and combined sewers.
Separate storm and sanitary sewers serve parts of the District. In the combined sewer system (CSS), there is a single sewer to convey storm water and
sanitary wastes. The area served by combined sewers comprises about one-third of the District.
During dry weather, sanitary wastes collected in the CSS are conveyed to the DC Water’s wastewater treatment plant at Blue Plains (BPWWTP or the
Blue Plains WWTP). During periods of rainfall, the capacity of a combined sewer may be exceeded and the excess flow, which is a mixture of storm
water and sanitary wastes, is discharged directly to the Anacostia River, Rock Creek or the Potomac River or their tributary waters. This report summarizes
the operations of the combined sewer system for the month indicated.
2.
2.1
Regulators
Regulators divert combined sewage to interceptors, which convey flow to BPWWTP for treatment. When flows exceed the capacities of the systems
such as during significant rain events, regulators divert excess flow to CSO outfalls which discharge to receiving waters. The following table summarizes
inspections of CSO regulators in the collection system.
Table 2-1
Structure
Number
2
4
5
6
7
81
9
11
12
13
14
15
Location
Storm Pump Discharge at Main Pumping Station
Condition
Associated NPDES
Date
Needs
Outfall
Inspected Good Work
003
*
05/18/16
003
*
05/18/16
004
*
05/18/16
005
*
05/02/16
005
*
05/02/16
006
N/A
007
*
05/02/16
011(a)
011
009
011(a)
010
3
05/19/16
05/19/16
05/18/16
05/18/16
05/24/16
*
*
*
*
*
Work Needed
Work performed
Structure
Number
Location
15a
15b
15c
16
17
17a
18
19
19a
20
20a
21
22a
22b
22c
22d
22e
23
24a
28
29
30
31
33
34
34a
35
22nd Street, between Constitution Ave and C St, NW
Condition
Associated NPDES
Date
Needs
Outfall
Inspected Good Work
010
010
010
012
013
013
014
015
015
016
016
017
018
018
018
018
018
019
019
020
020
020
020
020
020
020
05/24/16
05/12/16
05/12/16
05/18/16
05/13/16
05/18/16
05/02/16
05/03/16
05/03/16
05/03/16
05/03/16
05/03/16
05/16/16
05/16/16
05/16/16
05/16/16
05/16/16
05/03/16
05/03/16
05/10/16
05/10/16
05/03/16
05/03/16
05/03/16
05/24/16
05/10/16
Work Needed
Work performed
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
16-311803 No Access
due to construction in
vicinity of structure.
021
4
The Kennedy
Center contractor is
constructing a
platform to provide
access by July
Structure
Number
36
36a
36b
36d
36g
36h
37
38
38a
39a
39b
41b
41c
42
43
43a
44
45
46
47
47a
47b
47c
491
50
51
52
52a
53
53a
53b
53c
Location
th
27 and I Streets, NW
Pennsylvania Ave, east side of Rock Creek, NW
L Street between 21st Street and New Hampshire Ave, NW
Condition
Associated NPDES
Date
Needs
Outfall
Inspected Good Work
022
022
022, 034
022, 034
022, 034
022, 034
022
024
024
024
024
025
025
026
027
027
027
028
029
029
029
029
029
031
032
033
034
034
022, 034
022, 034
022, 034
022
5
05/10/16
05/10/16
05/16/16
05/16/16
05/16/16
05/16/16
05/10/16
05/09/16
05/09/16
05/09/16
05/09/16
05/09/16
05/09/16
05/09/16
05/09/16
05/09/16
05/09/16
05/0216
05/02/16
05/02/16
05/02/16
05/02/16
05/02/16
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
N/A
05/16/16
05/16/16
05/24/16
05/24/16
05/20/16
05/20/16
05/18/16
05/18/16
*
*
*
*
*
*
*
*
Work Needed
Work performed
Structure
Number
Location
Condition
Associated NPDES
Date
Needs
Outfall
Inspected Good Work
rd
54
55
55a
56
57
581
59
60
61
62
63
64
65
65a
66
67
68
69
23 and O Streets, NW
Northwest of Belmont Road and Rock Creek and Potomac Parkway, NW
North of Belmont Rd, east of Kalorama Cir, NW
Biltmore St, Extended, east of Rock Creek, NW
Ontario Rd, Extended, and Rock Creek Pkwy, NW
Harvard Street and Rock Creek Parkway, NW
Adams Mill Road, south of Irving Street, NW
Ingleside Terrance, Extended and Piney Branch Parkway, NW
Mt. Pleasant Street, Extended and Piney Branch Parkway, NW
70
70i
71
72
72a
73
741
75
77
77a
781
791
84
84a
Piney Branch Parkway, west of 16th Street, NW
28th Street, west of Rock Creek Parkway, NW
O Street Extended and Rock Creek Parkway, NW
West side of Rock Creek, 300 ft. south of Massachusetts Ave, NW
Normanstone Dr Extended, west of Rock Creek, NW
Normanstone Dr and Normanstone Lane, NW
28th Street Extended, west of Rock Creek, NW
Connecticut Ave and Rock Creek Parkway, NW
034
035
035
036
036
037
038
039
040
041
042
043
044
044
045
046
047
048
049
049
050
051
051
052
053
054
056
056
057
058
060
060
6
05/13/16
05/13/16
05/13/16
05/13/16
05/13/16
*
*
*
*
*
N/A
05/03/16
05/03/16
05/03/16
05/04/16
05/04/16
05/04/16
05/04/16
05/04/16
05/04/16
05/04/16
05/04/16
05/04/16
*
*
*
*
*
*
*
*
*
*
*
*
05/04/16
05/02/16
05/20/16
05/16/16
05/13/16
05/13/16
*
*
*
*
*
*
N/A
05/12/16
05/12/16
05/12/16
*
*
*
N/A
N/A
05/13/16
05/13/16
*
*
Work Needed
Work performed
Notes:
1. Structure no longer functions as a combined sewer overflow regulator.
2. Where construction is indicated to be in progress at a regulator, the contractor maintains flow (i.e. prevents DWO) during construction by flow
diversion, bypass pumping, fluming, sandbagging or other means.
2.2
The following table summarizes inspections, maintenance and work performed on outfall structures, tide gates and CSO signs in the collection system.
Table 2-2
NPDES
Outfall
003
005
0061
007
009
010
011
011(a)
012
013
014
015
016
017
018
019
020
021
Location
Bolling Air Force Base, at Giavanolli and Chanute, SW
Across from Navy Yard, aligned with Parsons Ave., SE
Good Hope Road and Welsh Memorial Bridge
Between 11th St. and Anacostia Bridges, SE
Southeast Federal Center, aligned with 4th St.
Navy Yard, aligned with 6th St., SE
Navy Yard, aligned with 9th Street, SE
12th and O Streets, SE
M and Water Street, SE
East of Barney Circle & South of Pennsylvania Avenue Bridge, SE
Adjacent to Service Drive behind swirl facility & D.C. General
Hospital
Rock Creek Parkway and Independence, NW
Rock Creek Parkway and C St., NW
Tide
Outfall
Gate
Tide Gate
Date
Needs
Needs
Needs
05/18/16
*
*
*
*
05/10/16
*
*
*
*
N/A
05/19/16
05/19/16
05/19/16
05/19/16
05/19/16
05/19/16
05/19/16
05/19/16
05/19/16
05/09/16
05/19/16
05/09/16
05/19/16
05/20/16
05/20/16
7
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
NPDES
Outfall
022
024
025
026
027
028
029
0311
032
033
034
035
036
0371
041
042
043
044
045
046
Location
Rock Creek Parkway and G St., NW
South of 30th and K Streets, NW1
South of 31st and K Streets, NW
Wisconsin Avenue and Water Street, NW
33rd and Water Sts., NW
Key Bridge and Whitehurst Freeway, NW
Adjacent to C&O Canal, aligned with 38th St. NW
Rock Creek Pkwy & Pennsylvania Avenue, NW
26th and M Street, NW.
Across street from St. Francis Jr. High and aligned with N St., NW.
Just west of St. Francis Jr. High and north of N St., NW
P St. Bridge and Rock Creek Parkway
22nd Street, South of Q Street NW.
Waterside Dr. and Rock Creek Parkway
Between arch footbridge and Connecticut Ave., north of Kalorama
Circle, NW.
Connecticut Avenue Bridge and Rock Creek Parkway, NW.
Aligned with Biltmore Rd., between Connecticut Ave and
Ellington Bridge.
Beach Dr. and Ontario Pl., NW
North of Beach Dr. and Walbridge Pl, NW.
Piney Branch Parkway and Park Road, NW.
047
Piney Branch Parkway and Ingleside Terrace
038
039
040
048
049
050
051
Tide
Outfall
Gate
Tide Gate
Date
Needs
Needs
Needs
05/05/16
*
*
*
*
05/05/16
*
*
*
*
05/05/16
*
*
*
*
05/05/16
*
*
*
*
05/05/16
*
*
*
05/05/16
*
*
*
05/05/16
*
*
*
N/A
*
*
*
*
*
*
*
*
*
*
*
05/03/16
05/20/16
*
*
*
*
*
*
*
*
05/10/16
05/10/16
05/10/16
05/10/16
05/10/16
05/04/16
05/10/16
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
th
05/04/16
*
*
*
*
th
05/04/16
05/20/16
05/12/16
*
*
*
*
*
*
*
*
*
*
*
*
South of Piney Branch Parkway and 17 St.
North of Piney Branch Parkway and 17 St.
Across Rock Creek Pkwy, aligned with Olive St., NW.
05/16/16
05/16/16
05/13/16
05/13/16
05/18/16
*
*
*
*
*
*
*
*
*
*
N/A
05/03/16
8
*
NPDES
Outfall
052
0531
054
056
0571
0581
060
Tide
Outfall
Gate
Tide Gate
Date
Needs
Needs
Needs
05/12/16
*
*
*
*
Location
Between P & Penna. Ave Bridges, aligned with O Street, NW.
Q St. Bridge and Rock Creek Parkway, NW.
Massachusetts Ave & Rock Creek Parkway, NW.
Normanstone Dr. and Rock Creek Parkway, NW.
28th Street and Rock Creek Parkway, NW
Connecticut Ave & Rock Creek Parkway, NW.
North of P St. Bridge & Rock Creek Pkwy, NW
N/A
05/12/16
05/12/16
*
*
*
*
*
*
*
*
*
*
*
*
N/A
N/A
05/18/16
Notes:
2.3
Pumping Stations
Table 2-3
Pumping
Station
Main
No. of
No.
No.
Screens or Pumps
Out of Service
31
3
6
Screen #4
Pump #3
Eastside
2
2
4
Screen #1
Screen #2
Pump #1
Poplar Point
2
3
3
Screen #2
Potomac
31
4
5
Pump #5
Dates
05/01/16-05/31/16
05/01/16-05/31/16
05/01/16-05/14/16
05/14/16-05/31/16
05/01/16-05/31/16
05/01/16-05/31/16
05/01/16-05/31/16
Reason
Screen rebuild
Contractor rehab
Screen rebuild
Screen rebuild
Check valve issue
Screen rebuild
Potomac rehab work –
Phase 3 Contractor
Responsibility
Work Order
Number
Schedule to Restore to Service1
16-235069
07/31/16
16-76407
16-346314
16-248765
16-169379
Returned to service on 05/14/16
07/15/16
06/15/16
07/15/16
06/06/16
Notes:
1.
The schedule to restore to service is impacted by the type and age of equipment. In some cases, the condition of equipment and the lack of
availability of replacement parts necessitate complete replacement of the unit or element or custom fabrication of needed parts to return the units to
service. For these and other reasons, projects are underway for the rehabilitation of the pumping stations.
9
Pumping Station
Main
O St
Eastside
Poplar Point
Potomac
Rock Creek
Upper Anacostia
Earl Place
Date Performed
05/01/16
05/01/16
05/14/16
05/14/16
05/01/16
05/14/16
05/14/16
05/14/16
Table 2-4
Type of Preventive Maintenance
Work Order
Performed1
Number
Comments
Group A
16-305437
Group A
16-297299
Group A
16-329220
Group A
16-300567
Group A
16-329699
Group A
16-321653
Group A
16-305451
Group A
16-336209
Notes:
Table 2-5
Pumping Station
Main
O St
Eastside
Poplar Point
Potomac
Rock Creek
Upper Anacostia
Earl Place
Sanitary Pumpage
Total Wastewater
Daily Average
(mg)
Wastewater (mg)
2417.07
77.97
127.29
4.11
214.18
555.27
3729.22
155.13
42.33
0.165
6.91
17.91
120.30
5.00
1.37
0.005
Date
Volume (mg)
(units)1
N/A
N/A
N/A
05/02/16
35.14
Normal
05/06/16
15.33
Normal
05/21/16
3.99
Normal
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Notes:
1. Screening consists of vertical trash racks, with no mechanical cleaning. Quantification of captured materials is not possible on monthly basis.
10
2.4
The Northeast Boundary Swirl Facility provides screening, swirl concentration, chlorination and dechlorination of CSO overflow from CSO 019. The
capacity of the facility is 400 MGD. Facility operations are summarized below:
Table 2-6
Date
Inspected
05/01/16
No.
Screens
3
No.
Swirls
3
Screens or Swirls
Out of Service
Screen #1
Screen #2
Screen #3
Dates
05/06/16
05/06/16
05/06/16
Reason
Maintenance
Returned to service for event on 05/17/16
Table 2-7
Date Performed
05/01/16
Work Order Number
16-332330
Group A
Comments
Notes:
Table 2-8
Date
05/01/16
05/02/16 – 05/03/16
05/06/16
05/17/16
05/21/16
05/29/16 – 05/30/16
Approx. Storm
Duration (hrs)1
6
8.5
12.5
6.5
6
7
Total Influent
Volume (mg)
3.01
16.41
19.67
1.16
11.19
13.64
Total Foul Sewer
Volume (mg)
3.01
5.07
5.92
1.16
4.25
5.60
Total Effluent
Volume (mg)
0
11.34
13.76
0
6.94
8.03
Approx. Screenings
Volume (Cu. ft)
52
72
168
36
48
48
Notes:
1.
Approx. length of time influent flow rate was above the 15 mgd threshold for allowing flow through the facility.
11
Chlorination/Dechlorination Systems
The table below summarizes the information about the operation of Swirl Facility chlorination and dechlorination systems during storm events.
The chlorination feed system was not activated during the storm events in which flows were 15 mgd or greater due to a breakdown in our system of
internal controls concerning the supply of Sodium Hypochlorite. This problem was corrected on July 26, 2016. DC Water is assessing its systems of
controls to prevent a reoccurrence. We have taken interim measures to ensure the availability of Sodium Hypochlorite at all times to ensure compliance
with the NPDES permit while we continue our assessment. All other chemical feed systems were not activated during these storm events. Included
in the table are results of residual chlorine, enterococcus and fecal coliform testing for samples taken in the Swirl Facility mix chamber and at the
facility effluent outfall to the Anacostia River.
Grab samples for residual chlorine are taken and immediately tested with a portable analyzing kit. Samples for fecal coliform and enterococcus are
taken from the designated sample point, treated with sodium bisulfate to remove any residual chlorine, and conveyed to the Blue Plains Wastewater
Treatment Plant Laboratory for testing.
Table 2-9
Date
Dosages
Chlor/
Dechlor
System NaOCl NaHSO3
Used? (mg/l)
(mg/l)
05/02/16
No2
0
0
05/06/16
No2
0
0
05/21/16
No
0
0
05/29/16
No
0
0
Results
Location
Mix Chamber
Anacostia River1
Mix Chamber
Anacostia River1
Mix Chamber
Anacostia River1
Mix Chamber
Anacostia River1
Conc.
(mg/l)
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
Notes:
2. The chlorination system was required but not operational during these storm events.
12
Count
Per
Site
100ml
Mix Chamber
45,000
Anacostia River1
51,000
Mix Chamber
470,000
1
Anacostia River
310,000
Mix Chamber
440,000
1
Anacostia River
4,200
Mix Chamber
310
Anacostia River1 320,000
Table 2-10
Date
05/02/16
05/06/16
05/21/16
05/29/16
Total suspended
solids (mg/L)
160
64.0
66.0
10.0
Nitrite
(NO2-N)
mg/L
0.03
0.03
0.00
0.00
Nitrate
(NO3-N))
mg/L
0.52
0.60
0.49
0.30
Total Kjeldahl
Nitrogen
(mg/L as N)
2.61
10.7
16.0
1.53
13
Total Nitrogen
(mg/L)
3.16
11.3
16.5
1.83
Total
Phosphorus
(mg/L)
0.49
1.13
0.47
0.16
Carbonaceous
Biological Oxygen
Demand (mg/L)
28.4
56.6
18.2
2.82
2.5 Inflatable Dams
DC Water operates and maintains twelve inflatable dams at eight different locations. The structure number, location and number of dams per site are
presented in Table 2-11. The inflatable dams consist of multi-ply elastomeric (i.e., “rubber”) fabric dams installed in major overflow conduits within the
combined sewer system. The objective of the inflatable dam installation is to increase the effective depth to which the sewage must rise in the combined
sewer before overflows occur. The effect of the installation is to retain a greater volume of combined sewage flow resulting from low to moderate intensity
storms by maximizing storage within the CSS. During higher intensity storms, when the full carrying capacity of the overflow conduit is required to
prevent upstream flooding, the dam is deflated automatically. Inflatable dam operations are summarized below:
Table 2-11
Inflatable Dam
Structure No
14 - East
14 - West
15
15A
16 - East
16 - West
24 - North
24 - Middle
24 - South
34
35
52
Date Inspected
Was Dam Out of Service
During the Month?
Dates out of Service
Reason
05/24/16
05/24/16
05/24/16
No
No
Yes
N/A
N/A
05/18/16-05/19/16
05/24/16
05/24/16
05/24/16
05/24/16
05/24/16
05/24/16
05/24/16
05/09/16
05/24/16
No
No
No
No
No
No
No
Yes
No
N/A
N/A
N/A
N/A
N/A
N/A
N/A
05/08/16-05/09/16
N/A
N/A
N/A
Failed Air
Compressor
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Valve Malfunction
N/A
Schedule to Restore to
Service
N/A
N/A
05/19/16
N/A
N/A
N/A
N/A
N/A
N/A
N/A
05/09/16
N/A
Notes:
On 05/08/16, a valve malfunction at Inflatable Dam Structure 35 caused the dam to deflate. Repairs were made on 05/09/16.
Between 05/16/16-05/18/16, Inflatable Dam Structure 14 experienced a series of deflations due to a malfunction with the level sensor. Repairs were
made on 05/18/16.
On 05/18/16, Inflatable Dam Structure 15 deflated due to a malfunction with the air compressor. It was repaired on 05/19/16.
In all instances, there were no flow conditions at the structures during these times capable of overflowing to the outfall.
14
Table 2-12
Inflatable Dam Structure No.
14 (E & W)
15
15A
34
35
52
Overflow Dates
None
None
05/02/16
05/06/16
05/21/16
05/29/16
None
05/02/16
05/29/16
None
05/02/16
None
N/A
N/A
1hr 53 mins
3 hrs 6 mins
1 hr 5 mins
1hr 24 mins
N/A
10 mins
4 mins
N/A
23 mins
N/A
Structures on Outfall Sewers
Outfall Structure 1
Outfall Structure 2
Outfall Sewer Control Gates
Overflow Dates
None
None
None
Operational Status
Operational
Operational
None
Position
Open
16 (E & W)
24
15
3.
There was no dry weather combined sewer overflow during May 2016.
Location Alabama Ave SE & Stanton Rd SE
DC Water received a service call about an overflowing sewer manhole at the intersection of Alabama Ave
Cause SE & Stanton Rd SE, and dispatched a maintenance crew from DSS to investigate the report.
Date/ Time Discovered May 16th, 2016 approximately 9:53 AM
Action Taken The crew cleared the grease and debris buildup in the 10” sanitary sewer line.
Date/Time Discharge Ceased May 16th, 2016 1:30 PM
DSS plans to inspect the 10” Sewer by closed circuit television camera (CCTV) to determine whether
Action taken to prevent reoccurrence additional action is needed to prevent a recurrence.
16
4.
4.1
Total CBs
1465
2930
3506
3329
3845
CBs in
CSS
1424
2665
168
1730
1720
CBs in
Anacostia
CSS
653
529
0
0
1662
6
7
3557
3463
2888
27
2877
27
8
2662
206
206
24757
10828
5954
24757
10828
5954
Ward
1
2
3
4
5
Subtotal
DDOT (via VMS)
Subtotal
Grand Total
% Cleaned/Inspected
to Date
Inspections
Total
Total
Anacostia Anacostia
CBs
CBs
Inspected
Inspected
Year
Year
99
3
353
45
0
0
0
0
158
4
1499
61
0
0
Cleaning
CBs Cleaned Thru
Last Month
CB’s Cleaned
This Month
Total CBs Cleaned
This Year to Date
Total
130
543
In CSS
130
466
Total
11
14
In CSS
11
14
Total
141
557
In CSS
141
480
193
116
1313
1790
3775
6
49
190
1486
0
15
1237
39
97
34
1
908
38
48
0
208
1353
1352
1887
3809
7
957
228
1534
0
150
2
1970
150
31
13
2001
163
2259
115
9830
2477
1478
1033
11308
3510
2259
115
9830
2477
1478
1033
11308
3510
40%
23%
46%
32%
38%
Note: In preparation for the deployment of the Catch Basin Cleaning Application, an exercise was completed to verify and update the catch basin data
for those catch basins that flowed to the Anacostia. DC Water originally was managing the catch basin cleaning at the counter map level, and then
progressed to a cluster and with the deployment in May of the Catch Basin Cleaning Application, DC Water is now tracking cleaning at the individual
catch basin level – against the asset itself. The totals have changed due to information that is more accurate.
17
4.2
DC WATER operates the following demonstration projects designed to remove solids and floatables from CSO prior to discharge.
Table 4-2
Facility
Date
Inspected
5/23/2016
Good
Bar Rack CSO 040
Bar Rack CSO 041
5/20/2016
5/10/2016
Good
Good
Condition
Work Needed
Routine
Cleaning
None
None
Work performed
Routine Cleaning
Material Removed
(CY)
None.
Routine Cleaning
Routine Cleaning
(1)
(1)
Notes: (1) System is designed such that captured solids and floatable are conveyed to Blue Plains for treatment.
18
4.3
This program was initiated in October 1992 to remove floating debris from Anacostia and Potomac Rivers on a routine basis. The program has
continued from that time and is now under the auspices of DC WATER, Department of Sewer Services. The floating debris removal program
utilizes a skimmer boat and support boats to remove floatable debris from the Rivers as well as trash, which accumulates on the riverbanks and
in the mud flats at low tides. Work for the most part is directed toward the Anacostia River. The boats pick up debris five days a week.
Operations are summarized as follows:
Table 4-3
Program Operation
Days not Operating
# Skimmer in Fleet
Dates
Reason
21
2
Environmental
3 Skimmers
1 Skimmer
B28: 5/1 - 5/31 B29: 5/4, 5/6 - 5/12, 5/16 - 5/19
B29: Hydraulic oil leak and starboard wing broken off.
B29: Returned to service on 5/5, 5/13, and 5/20.
4.4
CSS Litter Control
This section describes DC WATER’s efforts to coordinate litter control efforts with the National Park Service and D.C. Department of Public
Works to maximize litter control efforts in the combined sewer system.
19
5.
MONITORING
5.1
DC Water performs visual surveys of the bar racks at Main and O Street Pumping Stations to characterize the quantity and nature of floatable
discharge. The physical condition of the bar racks and any maintenance requirements are also noted.
Table 5-1
Pumping Station
Bar Racks at O
Street Storm
Pumps (CSO 010)
Bar Racks at Main
Storm Pumps
(CSO 011)
Condition
Needs
Good
Work
Inspector
Date
Inspected
WR
05/01/2016
X
WR
05/01/2016
X
20
Work Needed
Work Performed
or Schedule for
Completion
5.2 Rain Data
Date
5/1/2016
5/2/2016
5/3/2016
5/4/2016
5/5/2016
5/6/2016
5/7/2016
5/8/2016
5/9/2016
5/10/2016
5/11/2016
5/12/2016
5/13/2016
5/14/2016
5/15/2016
5/16/2016
5/17/2016
5/18/2016
5/19/2016
5/20/2016
5/21/2016
5/22/2016
5/23/2016
5/24/2016
5/25/2016
5/26/2016
5/27/2016
5/28/2016
5/29/2016
5/30/2016
5/31/2016
TOTAL
Brentwood
Bryant Street
Pumping Station Pumping Station
0.36
0.91
0.06
0.01
0.04
0.72
0.17
0.10
0.03
0.04
0.12
0.01
0.09
0.11
0
0
0.27
0
0
0
0.57
0.35
0.27
0.02
0
0
0
0
0.79
0
0
5.04
0.41
0.88
0.09
0.03
0.04
0.97
0.19
0.06
0.05
0
0.15
0
0.09
0.14
0
0
0.36
0
0
0
0.57
0.31
0.22
0.01
0
0
0
0
0.65
0
0
5.22
Main Pumping
Station
Rock Creek
Pumping Station
National Airport
0.42
1.01
0.10
0.06
0.01
0.88
0.07
0.05
0.04
0.07
0.33
0
0.06
0.10
0
0
0.40
0
0
0
0.59
0.35
0.24
0
0
0
0
0
0.83
0
0
5.61
0.41
1.17
0.08
0.03
0.01
0.78
0.10
0.07
0.03
0.01
0.15
0.01
0.07
0.14
0
0
0.38
0
0
0
0.61
0.37
0.21
0.01
0
0
0
0
0.58
0
0
5.22
0.48
1.24
0.17
0.03
0.02
0.79
0.14
0.04
0.06
0.01
0.41
0
0.08
0.13
0
0
0.41
0
0.01
0
0.65
0.37
0.18
0
0
0
0
0
0.43
0
0
5.65
21
For
Month: June 2016
Prepared By:
1
Washington, D.C.
Month: June 2016
Table of Contents
1.
INTRODUCTION
2.
2.1
Regulators
2.2
2.3
Pumping Stations
2.4
2.5
Inflatable Dams
3.
4.
4.1
4.2
4.3
4.4
CSS Litter Control
5.
MONITORING
5.1
5.2
Rainfall Data
2
1.
INTRODUCTION
The District of Columbia Water and Sewer Authority (DC Water) operates a wastewater collection system
comprised of separate and combined sewers. Separate storm and sanitary sewers serve parts of the District. In
the combined sewer system (CSS), there is a single sewer to convey storm water and sanitary wastes. The area
served by combined sewers comprises about one-third of the District.
During dry weather, sanitary wastes collected in the CSS are conveyed to the DC Water’s wastewater treatment
plant at Blue Plains (BPWWTP or the Blue Plains WWTP). During periods of rainfall, the capacity of a combined
sewer may be exceeded and the excess flow, which is a mixture of storm water and sanitary wastes, is discharged
directly to the Anacostia River, Rock Creek or the Potomac River or their tributary waters. This report
summarizes the operations of the combined sewer system for the month indicated.
2.
2.1
Regulators
Regulators divert combined sewage to interceptors, which convey flow to BPWWTP for treatment. When flows
exceed the capacities of the systems such as during significant rain events, regulators divert excess flow to CSO
outfalls which discharge to receiving waters. The following table summarizes inspections of CSO regulators in
the collection system.
Table 2-1
Structure
Number
2
Location
13
14
15
15a
15b
15c
16
17
17a
18
19
19a
Bolling AFB, 2250 ft. north of the south line
of the Base, SW
Bolling AFB, 2250 ft. north of the south line
of the Base, SW
Storm Pump Discharge at Main Pumping
Station
20
20a
21
22a
4
5
6
7
81
9
11
12
Associated
NPDES
Outfall
003
Condition
Date
Needs
Inspected Good Work
06/13/16
*
003
06/14/16
06/17/16
06/01/16
06/01/16
N/A
06/01/16
004
005
005
006
007
011(a)
06/17/16
06/20/16
011
06/15/16
06/15/16
06/21/16
06/21/16
06/06/16
06/06/16
06/16/16
06/06/16
06/15/16
06/07/16
06/01/16
06/01/16
06/01/16
06/01/16
06/01/16
06/03/16
009
011(a)
010
010
010
010
012
013
013
014
015
015
016
016
017
018
3
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Work Needed
Work
performed
Structure
Number
22b
22c
22d
22e
23
24a
28
29
30
31
33
34
34a
35
36
36a
36b
36d
36g
36h
37
38
38a
39a
39b
41b
41c
42
43
43a
44
45
46
47
47a
47b
47c
491
50
51
52
52a
53
53a
Location
22nd Street, between Constitution Ave and C
St, NW
27th and I Streets, NW
Pennsylvania Ave, east side of Rock Creek,
NW
Associated
NPDES
Outfall
018
018
018
018
019
019
020
020
020
020
020
020
020
Condition
Date
Needs
Inspected Good Work
06/03/16
06/03/16
06/03/16
06/03/16
06/07/16
06/07/16
06/03/16
06/03/16
*
*
*
*
*
*
*
*
06/06/16
06/06/16
06/06/16
06/14/16
06/03/16
*
*
*
*
*
Work Needed
Work
performed
16-363491 No Access
due to construction in
vicinity of structure.
The Kennedy
Center contractor is
constructing a
platform to provide
access in July.
021
022
022
022, 034
022, 034
022, 034
022, 034
022
024
024
024
024
025
025
026
027
027
027
028
029
029
029
029
029
06/03/16
06/03/16
06/10/16
06/10/16
06/10/16
06/10/16
06/03/16
06/06/16
06/06/16
06/06/16
06/06/16
06/06/16
06/06/16
06/07/16
06/07/16
06/07/16
06/07/16
06/01/16
06/01/16
06/01/16
06/01/16
06/01/16
06/01/16
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
N/A
031
032
033
034
034
022, 034
022, 034
06/09/16
06/09/16
06/22/16
06/22/16
06/21/16
06/21/16
4
*
*
*
*
*
*
Structure
Number
53b
53c
54
55
55a
56
57
581
59
60
61
62
63
64
65
65a
66
67
68
69
70
70i
71
72
72a
73
741
75
77
77a
781
791
84
84a
Location
L Street between 21st Street and New
Hampshire Ave, NW
23rd and O Streets, NW
Northwest of Belmont Road and Rock Creek
and Potomac Parkway, NW
North of Belmont Rd, east of Kalorama Cir,
NW
Biltmore St, Extended, east of Rock Creek,
NW
Ontario Rd, Extended, and Rock Creek
Pkwy, NW
Harvard Street and Rock Creek Parkway,
NW
Adams Mill Road, south of Irving Street,
NW
Ingleside Terrance, Extended and Piney
Branch Parkway, NW
Mt. Pleasant Street, Extended and Piney
Branch Parkway, NW
Piney Branch Parkway, west of 16th Street,
NW
28th Street, west of Rock Creek Parkway,
NW
Olive Street Extended and Rock Creek
Pkwy, NW
Olive Street Extended and Rock Creek
Pkwy, NW
O Street Extended and Rock Creek Parkway,
NW
West side of Rock Creek, 300 ft. south of
Massachusetts Ave, NW
Normanstone Dr Extended, west of Rock
Creek, NW
Normanstone Dr and Normanstone Lane,
NW
28th Street Extended, west of Rock Creek,
NW
Connecticut Ave and Rock Creek Parkway,
NW
Associated
NPDES
Outfall
Condition
Date
Needs
Inspected Good Work
022, 034
06/17/16
*
022
034
035
035
036
036
06/17/16
06/14/16
06/14/16
06/14/16
06/14/16
06/14/16
*
*
*
*
*
*
N/A
037
038
039
06/01/16
*
06/01/16
06/01/16
*
*
06/15/16
*
06/15/16
*
06/15/16
*
06/15/16
06/15/16
06/15/16
06/15/16
06/15/16
*
*
*
*
*
06/15/16
*
06/03/16
*
06/03/16
06/03/16
*
*
06/14/16
*
06/14/16
*
06/14/16
*
040
041
042
043
044
044
045
046
047
048
049
049
050
051
051
052
053
N/A
06/07/16
*
06/07/16
*
06/07/16
*
054
056
056
N/A
057
N/A
058
060
060
06/14/16
06/14/16
5
*
*
Work Needed
Work
performed
Notes:
1. Structure no longer functions as a combined sewer overflow regulator structure.
2. Where construction is indicated to be in progress at a regulator, the contractor maintains flow (i.e.
prevents DWO) during construction by flow diversion, bypass pumping, fluming, sandbagging or other
means.
2.2
The following table summarizes inspections, maintenance and work performed on outfall structures, tide gates
and CSO signs in the collection system.
6
Table 2-2
NPDES
Outfall
Location
Bolling Air Force Base, at Giavanolli and
003 Chanute, SW
Across from Navy Yard, aligned with
005
Parsons Ave., SE
Good Hope Road and Welsh Memorial
0061
Bridge
007 Between 11th St. and Anacostia Bridges, SE
009 O St. Sewage Pumping Station, SE
010 O St. Sewage Pumping Station, SE
011 Main Sewage Pumping Station, SE
011(a) Main Sewage Pumping Station, SE
012 Main Sewage Pumping Station, SE
013 Southeast Federal Center, aligned with 4th St.
014 Navy Yard, aligned with 6th St., SE
015 Navy Yard, aligned with 9th Street, SE
016 12th and O Streets, SE
017 M and Water Street, SE
East of Barney Circle & South of
018
Pennsylvania Avenue Bridge, SE
Adjacent to Service Drive behind swirl
019
facility & D.C. General Hospital
020 Rock Creek Parkway and Independence, NW
021 Rock Creek Parkway and C St., NW
022 Rock Creek Parkway and G St., NW
024 South of 30th and K Streets, NW1
025 South of 31st and K Streets, NW
026 Wisconsin Avenue and Water Street, NW
027 33rd and Water Sts., NW
028 Key Bridge and Whitehurst Freeway, NW
Adjacent to C&O Canal, aligned with 38th St.
029
NW
Rock Creek Pkwy & Pennsylvania Avenue,
0311 NW
032 26th and M Street, NW.
Across street from St. Francis Jr. High and
033 aligned with N St., NW.
Just west of St. Francis Jr. High and north of
034 N St., NW
035 P St. Bridge and Rock Creek Parkway
036 22nd Street, South of Q Street NW.
0371 Waterside Dr. and Rock Creek Parkway
Between arch footbridge and Connecticut
038 Ave., north of Kalorama Circle, NW.
Connecticut Avenue Bridge and Rock Creek
039 Parkway, NW.
Aligned with Biltmore Rd., between
040
Connecticut Ave and Ellington Bridge.
041 Beach Dr. and Ontario Pl., NW
Tide
Outfall
Gate
Tide Gate
Date
Needs
Needs
Needs
Inspected OK Work Yes No OK Work OK Work
06/13/16
*
*
*
*
06/02/16
*
*
*
*
N/A
06/02/16
06/20/16
06/20/16
06/20/16
06/20/16
06/20/16
06/20/16
06/20/16
06/20/16
06/15/16
06/20/16
06/14/16
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
06/02/16
06/02/16
06/02/16
06/02/16
06/02/16
06/02/16
06/02/16
06/02/16
06/02/16
06/02/16
N/A
06/09/16
06/09/16
06/14/16
06/14/16
06/09/16
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
N/A
06/01/16
06/01/16
06/01/16
06/09/16
*
*
7
*
Notes, Work Needed or
Performed
NPDES
Outfall
042
043
044
045
046
Location
North of Beach Dr. and Walbridge Pl, NW.
Piney Branch Parkway and Park Road, NW.
047
Piney Branch Parkway and Ingleside Terrace
048
049
050
South of Piney Branch Parkway and 17 th St.
051
052
0531
054
056
0571
0581
060
Tide
Outfall
Gate
Tide Gate
Date
Needs
Needs
Needs
Inspected OK Work Yes No OK Work OK Work
06/09/16
*
*
*
*
06/09/16
*
*
*
*
06/09/16
*
*
*
*
06/09/16
*
*
*
*
06/15/16
*
*
*
06/15/16
*
*
*
*
06/15/16
*
*
*
*
North of Piney Branch Parkway and 17 th St.
06/15/16
*
06/03/16
*
Across Rock Creek Pkwy, aligned with
06/16/16
*
Olive St., NW.
Between P & Penna. Ave Bridges, aligned
06/16/16
*
with O Street, NW.
Q St. Bridge and Rock Creek Parkway, NW.
N/A
Massachusetts Ave & Rock Creek Parkway,
06/07/16
*
NW.
Normanstone Dr. and Rock Creek Parkway,
06/07/16
*
NW.
28th Street and Rock Creek Parkway, NW
N/A
Connecticut Ave & Rock Creek Parkway,
N/A
NW.
North of P St. Bridge & Rock Creek Pkwy,
06/09/16
*
NW
Notes:
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Notes, Work Needed or
Performed
2.3
Pumping Stations
Table 2-3
Pumping
Station
Main
Eastside
Poplar Point
Potomac
No. of
No.
No.
Screens or Pumps
Out of Service
30
3
6
Screen #4
Pump #3
2
2
4
Screen #2
Pump #1
2
31
3
4
3
5
Screen #2
Pump #5
Pump #4
Work Order
Number
Dates
06/01/16-06/30/16
06/01/16-06/30/16
06/01/16-06/30/16
06/01/16-06/15/16
Reason
Screen rebuild
Contractor rehab
Screen rebuild
Check valve issue
06/01/16-06/30/16 Screen rebuild
06/01/16-06/06/16 Potomac rehab work –
06/06/16-06/30/162 Phase 3 Contractor
Responsibility
16-235069
16-346314
16-248765
16-169379
Schedule to
Restore to
Service1
07/31/16
07/15/16
Returned to
service on
06/15/16
07/15/16
Returned to
service on
06/06/16
Notes:
1.
2.
The schedule to restore to service is impacted by the type and age of equipment. In some cases, the
condition of equipment and the lack of availability of replacement parts necessitate complete
replacement of the unit or element or custom fabrication of needed parts to return the units to service.
For these and other reasons, projects are underway for the rehabilitation of the pumping stations.
At Potomac Pump Station, Pump #5 was tested by the contractor for the Potomac Pump Station Phase 3
upgrade in coordination and with operational input from DC Water. Upon completion of testing, Pump
#5 was turned over to DC Water and placed back into service by DC Water Operations prior to taking
Pump #4 out of service for similar rehab work.
8
Pumping Station
Main
O St
Eastside
Poplar Point
Potomac
Rock Creek
Upper Anacostia
Earl Place
Date Performed
06/01/16
06/01/16
06/11/16
06/11/16
06/01/16
06/11/16
06/11/16
06/11/16
Table 2-4
Type of Preventive
Work Order
Maintenance Performed1
Number
Comments
Group A
16-343517 Add oil, grease bearings and replace packing if needed.
Group A
Group A
Group A
Group A
Group A
Group A
Group A
Notes:
Table 2-5
Pumping Station
Main
O St
Sanitary Pumpage
Total Wastewater
Daily Average
(mg)
Wastewater (mg)
2179.64
72.65
129.63
4.32
Eastside
Poplar Point
Potomac
Rock Creek
Upper Anacostia
Earl Place
166.05
503.70
3309.72
134.42
39.71
0.153
5.54
16.79
110.32
4.48
1.32
0.005
Date
Volume (mg)
(units)1
N/A
N/A
N/A
6/17/16
29.89
Normal
6/21/16
34.02
Normal
6/23/16
17.57
Normal
6/28/16 - 6/29/16
28.98
Normal
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Notes:
1. Screening consists of vertical trash racks, with no mechanical cleaning. Quantification of captured materials is
not possible on monthly basis.
2.4
The Northeast Boundary Swirl Facility provides screening, swirl concentration, chlorination and dechlorination
of CSO overflow from CSO 019. The capacity of the facility is 400 MGD. Facility operations are summarized
below:
Table 2-6
Date
Inspected
06/11/16
No.
Screens
3
No.
Swirls
3
Screens or Swirls
Out of Service
N/A
Dates
N/A
Reason
9
Table 2-7
Date Performed
06/11/16
Work Order Number
16-354624
Group A
Comments
Notes:
Table 2-8
Approx. Storm
Duration (hrs)1
7
9
4
8
6.5
3.5
5
Date
06/03/16
06/16/16
06/17/16
06/21/16
06/23/16
06/28/16 AM
06/28/16 PM
Total Influent
Volume (mg)
8.153
10.423
5.573
15.62
12.69
2.47
8.03
Total Foul Sewer
Volume (mg)
4.32
1.43
4.83
5.79
4.65
2.47
6.04
Total Effluent
Volume (mg)
3.83
8.99
0.74
9.83
8.04
0
1.99
Approx. Screenings
Volume (Cu. ft)
40
40
162
96
762
80
60
Notes:
1.
2.
3.
Approx. length of time influent flow rate was above the 15 mgd threshold for allowing flow through
the facility.
Screenings estimated for event based on inflow.
Volume estimated due to malfunction of influent meter
Chlorination/Dechlorination Systems.
The table below summarizes the information about the operation of Swirl Facility chlorination and
dechlorination systems during storm events. The chlorination feed system was not activated during the storm
events in which flows were 15 mgd or greater due to a breakdown in our system of internal controls concerning
the supply of Sodium Hypochlorite. This problem was corrected on July 26, 2016. DC Water is assessing its
systems of controls to prevent a reoccurrence. We have taken interim measures to ensure the availability of
Sodium Hypochlorite at all times to ensure compliance with the NPDES permit while we continue our
assessment. All other chemical feed systems were not activated during these storm events. Included in the
table are results of residual chlorine, enterococcus and fecal coliform testing for samples taken in the Swirl
Facility mix chamber and at the facility effluent outfall to the Anacostia River.
Grab samples for residual chlorine are taken and immediately tested with a portable analyzing kit. Samples for
fecal coliform and enterococcus are taken from the designated sample point, treated with sodium bisulfate
to remove any residual chlorine, and conveyed to the Blue Plains Wastewater Treatment Plant Laboratory
for testing.
10
Table 2-9
Date
Dosages
Chlor/
Dechlor
System NaOCl NaHSO3
Used? (mg/l)
(mg/l)
06/16/16
No
0
0
06/21/16
No2
0
0
06/23/16
No
0
0
06/28/16
No
0
0
Results
Location
Mix Chamber
Anacostia River1
Mix Chamber
Anacostia River1
Mix Chamber
Anacostia River1
Mix Chamber
Anacostia River1
Conc.
(mg/l)
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
Count
Per
Site
100ml
Mix Chamber
320,000
Mix Chamber
410,000
Anacostia River1
3,800
Mix Chamber
310,000
Mix Chamber
240,000
1
Anacostia River
280,000
Notes:
2. The chlorination system was required but not operational during the storm event.
Table 2-10
Date
06/16/16
06/21/16
06/23/16
06/28/16
Total
suspended
solids (mg/L)
290
23.0
35.0
130
Nitrite
(NO2-N)
mg/L
0.09
0.05
0.00
0.00
Total
Kjeldahl
Nitrate
Nitrogen
(NO3-N))
(mg/L as
Total Nitrogen
mg/L
N)
(mg/L)
0.70
14.6
15.4
0.27
1.03
1.35
0.37
2.72
3.09
0.43
3.53
3.96
11
Total
Phosphoru
s (mg/L)
2.18
0.05
0.33
0.50
Carbonaceous
Biological
Oxygen
Demand
(mg/L)
77.8
6.99
12.2
20.1
2.5 Inflatable Dams
DC Water operates and maintains twelve inflatable dams at eight different locations. The structure number,
location and number of dams per site are presented in Table 2-11. The inflatable dams consist of multi-ply
elastomeric (i.e., “rubber”) fabric dams installed in major overflow conduits within the combined sewer system.
The objective of the inflatable dam installation is to increase the effective depth to which the sewage must rise
in the combined sewer before overflows occur. The effect of the installation is to retain a greater volume of
combined sewage flow resulting from low to moderate intensity storms by maximizing storage within the CSS.
During higher intensity storms, when the full carrying capacity of the overflow conduit is required to prevent
upstream flooding, the dam is deflated automatically. Inflatable dam operations are summarized below:
Table 2-11
Inflatable Dam
Structure No
14 - East
14 - West
15
15A
16 - East
16 - West
24 - North
24 - Middle
24 - South
34
35
52
Date Inspected
Was Dam Out of
Service During
the Month?
06/15/16
06/15/16
06/21/16
06/21/16
06/21/16
06/21/16
06/25/16
06/25/16
06/25/16
06/21/16
06/15/16
No
No
No
No
No
No
No
No
No
No
Yes
06/21/16
No
Dates out of
Service
Reason
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
6/09/166/21/16
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Level Switch
Malfunction
N/A
Schedule to
Restore to
Service
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
6/21/16
N/A
Notes:
Between 06/09/16-06/21/16 Inflatable Dam Structure 35 experienced a malfunction causing it to deflate. Due to
unsafe conditions at the site, repairs could not be made until 06/21/16. During this time, there were two
occasions where flow conditions overflowed to the outfall. They are noted in Table 2-12 below.
On 06/16/16, Inflatable Dam Structure 14 deflated during dry weather due to an air line leakage. The issue was
resolved the same day.
12
Table 2-12
Inflatable Dam Structure
No.
14 (E & W)
15
15A
16 (E & W)
24
34
35
52
Structures on Outfall
Sewers
Outfall Structure 1
Outfall Structure 2
Outfall Sewer Control
Gates
Gate No.1
Gate No.2
Overflow Dates
None
06/21/16
06/28/16
06/16/1606/17/16
06/21/16
06/23/16
06/28/16
None
06/16/16
06/21/16
06/28/16
None
06/16/161
06/21/161
06/21/16
06/28/162
None
Overflow Dates
None
None
None
Operational
Status
Operational
Operational
N/A
1 hr 35mins
54 mins
10 hrs 12 mins
2 hrs
6 hrs 30 mins
2 hrs 58 mins
N/A
9 mins
20 mins
9 mins
N/A
1 hr 25 mins
45 mins
36 mins
22 mins
N/A
None
Position
Open
Notes:
1. During structure 35 malfunction.
2. Overflow occurred during malfunction of Pump #5 due to contractor work on Pump #4 motor starter
upgrades.
13
3.
There was no dry weather combined sewer overflow during June 2016.
Location 1509 Anacostia Ave, NE
DC Water received a service call from a contractor working in the area to
identify an unmarked sewer in his excavation. Department of Sewer Services
dispatched crew to investigate. The crew did not observe an ongoing sanitary
discharge but found evidence of a prior overflow, which they attributed to a
Cause partially failed bulkhead at a manhole on an 18-inch sanitary main.
Date/ Time Discovered June 2, 2016 approximately 12:00 PM
Action Taken A repair crew was dispatched to fix the failed bulkhead.
Date/Time Discharge Ceased June 2, 2016 approximately 1:00 PM
DSS plan to inspect the sewer by closed circuit television camera (CCTV) to
Action taken to prevent reoccurrence determine whether additional action would be needed to prevent a recurrence.
Location South Capitol St., & Galveston Rd., SW
DC Water received a service call from a customer regarding sewage
flowing near South Capitol St., and Forester St., SW. DSS maintenance
was dispatched and found an overflowing manhole in a grassy area near
Cause South Capitol St and Galveston Rd SW.
The crew was able to clear a buildup of grease and rap in the 10-inch
Action Taken sanitary sewer and stop all overflow.
Date/Time Discharge Ceased June 8, 2016 approximately 2:20 PM
DSS plan to inspect the sewer by closed circuit television camera (CCTV)
the 10-inch sewer to determine whether additional action would be needed
Action taken to prevent reoccurrence to prevent a recurrence.
Location 2321 First Street NW
DC Water received a service call from a homeowner regarding a sewer back up in
their home. A maintenance crew from Department of Sewer Services (DSS) was
dispatched to investigate the report. Crew found stagnant flow in a 12 inch combined
Cause sewer that serves the property.
The maintenance crew was able to clear the blockage and relieve the resident. The
Action Taken backup was caused by a buildup of roots in the sewer.
Date/Time Discharge Ceased June 17, 2016 approximately 12:30 AM
DSS plan to inspect the 12-inch sewer by closed circuit television camera (CCTV) to
Action taken to prevent reoccurrence determine whether additional action would be needed to prevent a recurrence.
14
4.
4.1
Inspections
Total
Total
Anacostia Anacostia
CBs
CBs
Inspected
Inspected
Year
Year
103
3
354
45
0
0
0
0
161
4
1505
61
0
0
Total
CBs
1465
CBs in
CSS
1424
CBs in
Anacostia
CSS
653
5
6
7
2930
3506
3329
3845
3557
3463
2662
232
1752
1720
2888
27
526
0
0
1662
2877
27
8
2662
206
206
150
Subtotal
DDOT
(via
VMS)
Subtotal
Grand
Total
%
Cleaned/
Inspecte
d to Date
24757
10911
5951
24757
10911
5951
Ward
1
2
3
4
Cleaning
CBs Cleaned Thru
Last Month
CB’s Cleaned
This Month
In CSS
6
Total
147
In
CSS
147
12
62
651
7
6
0
569
533
2864
1361
1893
3823
492
69
1608
235
1540
0
4
0
2005
163
3510
1887
744
13195
4254
11308
3510
1887
744
13195
4254
46%
32%
53%
39%
Total
141
In CSS
141
557
208
1353
1352
1887
3809
480
7
957
228
1534
0
6
12
325
1511
9
6
14
2
2001
163
2259
115
11308
2259
115
38%
Total CBs Cleaned
This Year to Date
Total
Note: In preparation for the deployment of the Catch Basin Cleaning Application, an exercise was completed to
verify and update the catch basin data for those catch basins that flowed to the Anacostia. DC Water originally
was managing the catch basin cleaning at the counter map level, and then progressed to a cluster and with the
deployment in May of the Catch Basin Cleaning Application, DC Water is now tracking cleaning at the
individual catch basin level – against the asset itself. The totals have changed due to information that is more
accurate.
4.2
DC WATER operates the following demonstration projects designed to remove solids and floatables from CSO
prior to discharge.
15
Table 4-2
Facility
Bar Rack CSO 040
Bar Rack CSO 041
Date
Inspected
6/14/2016
6/1/2016
6/9/2016
Condition
Work Needed
Replace nets.
None
None
Good
Good
Good
Work performed
Nets replaced.
Routine Cleaning
Routine Cleaning
Notes:
(1) System was designed so that captured solids and floatable are conveyed to Blue Plains for treatment.
16
Material Removed
(CY)
350 pounds.
(1)
(1)
4.3
This program was initiated in October 1992 to remove floating debris from Anacostia and Potomac
Rivers on a routine basis. The program has continued from that time and is now under the auspices of
DC WATER, Department of Sewer Services. The floating debris removal program utilizes a skimmer
boat and support boats to remove floatable debris from the Rivers as well as trash, which accumulates
on the riverbanks and in the mud flats at low tides. Work for the most part is directed toward the
Anacostia River. The boats pick up debris five days a week. Operations are summarized as follows:
Table 4-3
Program Operation
Days not Operating
# Skimmer in Fleet
Dates
Reason
22
5
Environmental (4) Fleet troubleshooting and maintenance (1).
3 Skimmers
3 Skimmers (on the last day of the month)
B28: 6/1 - 6/30 B29: 6/6 - 6/23, 6/30 B32: 6/30
B29: No. 1 screen jammed loss of power port prop.
B32: Possible fuel leak around fuel tank.
B29: Fleet troubleshooting. ETR unknown.
B32: Fleet troubleshooting. ETR unknown.
4.4
CSS Litter Control
This section describes DC WATER’s efforts to coordinate litter control efforts with the National Park
Service and D.C. Department of Public Works to maximize litter control efforts in the combined sewer
system.
17
5.
MONITORING
5.1
DC Water performs visual surveys of the bar racks at Main and O Street Pumping Stations to characterize the
quantity and nature of floatable discharge. The physical condition of the bar racks and any maintenance
requirements are also noted.
Table 5-1
Pumping Station
Bar Racks at O
Street Storm
Pumps (CSO 010)
Bar Racks at Main
Storm Pumps
(CSO 011)
Condition
Needs
Good
Work
Inspector
Date
Inspected
WR
06/01/2016
X
WR
06/01/2016
X
18
Work Needed
Work
Performed or
Schedule for
Completion
5.2 Rain Data
Date
6/1/2016
6/2/2016
6/3/2016
6/4/2016
6/5/2016
6/6/2016
6/7/2016
6/8/2016
6/9/2016
6/10/2016
6/11/2016
6/12/2016
6/13/2016
6/14/2016
6/15/2016
6/16/2016
6/17/2016
6/18/2016
6/19/2016
6/20/2016
6/21/2016
6/22/2016
6/23/2016
6/24/2016
6/25/2016
6/26/2016
6/27/2016
6/28/2016
6/29/2016
6/30/2016
TOTAL
Brentwood
Pumping
Station
0
0
0.36
0
0.08
0
0
0
0
0
0
0
0
0
0
0.34
0
0
0
0
0.87
0
0.45
0
0
0
0.10
1.09
0
0
3.29
Bryant Street
Main Pumping
Pumping Station
Station
0
0
0.34
0
0.09
0
0.01
0
0
0
0
0
0
0
0.01
0.31
0.16
0.01
0
0
0.76
0.03
0.39
0.01
0.01
0
0.12
1.11
0
0.01
3.37
0
0
0.23
0
0.07
0
0
0
0
0
0
0
0
0
0
0.47
0.01
0
0
0
0.79
0
0.53
0
0
0
0.11
0.81
0
0
3.02
19
Rock Creek
Pumping Station
National Airport
0
0
0.28
0
0.08
0
0
0
0
0
0
0
0
0
0
0.55
0
0
0
0
1.00
0
0.50
0.01
0
0
0.11
1.34
0
0
3.87
0
0
0.32
0
0.16
0
0
0
0
0
0
0
0
0
0
0.46
0
0
0
0
0.99
0
0.53
0
0
0
0.35
0.87
0
0
3.68
District of Columbia Water and Sewer Authority
Combined Sewer System Model Results
Period: April, May June 2016
SCENARIO: PCCM_Y2016_Q2, produced July 8, 2016
NPDES No.
Description
Anacostia CSOs
Chicago St and Railroad Station SE
005
Good Hope Road, West of Nichols
Ave.,SE
006
13th Street and Ridge Place,SE
007
2nd Street, 300 feet North of N Place,
SE
009
O Street SewagePumping Station, SE
(pumped Overflow)
010
South of Main Sewage Pumping
Station, SE (pumped overflow)
011
South of Main SewagePumping
Station, SE (gravity overflow)
011a
North of Main SewagePumping
Station, SE (Tiber Creek)
012
4th and N Streets, SE
013
014
015
016
017
Barney Circle andPennsylvania Ave,
SE
018
Northeast Boundary - Swirl Effluent
019
Northeast Bound. - Swirl Bypass
019
SUBTOTAL
Potomac CSOs
Bolling AFB
003
23rd Street, North ofConstitution Ave,
NW (Easby Point)
020
Northeast ofRoosevelt Bridge, NW
021
022
024
31st & K St NW
025
Wisconsin Avenue andK St., NW
026
Water Street West ofStreet, NW
027
028
Canal Road 1000 feet east of Rock
Creek,NW
029
SUBTOTAL
Total
Number of
CSO
Duration of Avg Duration
Overflows
Overflow
Overflow
of Overflow
(Occurrences) Volume (mg)
(hrs)
(hrs)
19
3.13
51.25
Maximum
Duration of
Overflow
(hrs)
Minimum
Duration of
Overflow
(hrs)
2.70
8.50
0.50
separated
9
2.56
9.75
1.08
2.00
0.25
10
1.76
15.75
1.58
2.25
0.50
12
40.21
9.75
0.81
2.75
0.25
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
0
10
10
8
7
14
0.00
2.11
3.40
0.67
2.15
7.58
0.00
20.00
17.00
8.25
7.75
36.50
0.00
2.00
1.70
1.03
1.11
2.61
0.00
4.50
3.00
1.75
2.00
6.50
0.00
0.25
0.50
0.50
0.25
0.50
10
12
4
4.04
133.78
35.01
236.39
15.75
61.50
3.25
1.58
5.13
0.81
2.75
12.00
1.25
0.25
1.25
0.50
0
0.00
0.00
0.00
0.00
0.00
5
11
11
5
4
0
5
12
0.40
126.78
2.51
6.69
0.32
0.00
3.33
1.22
8.00
26.00
20.50
12.75
2.75
0.00
6.00
17.50
1.60
2.36
1.86
2.55
0.69
0.00
1.20
1.46
2.50
4.25
3.50
4.25
1.00
0.00
1.75
2.25
0.50
0.25
0.25
1.00
0.25
0.00
0.25
0.50
7
3.63
144.87
6.50
0.93
1.75
0.25
Rock Creek
031
032
033
034
035
036
037
038
039
040
041
Pennsylvania Avenue, East Rock
Creek, NW
N Street extendedwest of 25th
Street,NW
23rd and O Streets, SW
22nd Street south of Q Street, NW
22nd Street South of Q Street, NW
Northwest of Belmontand Rock Creek
and Potomac Parkway
North of Belmont Road,east of
Kalorama Circle, NW
Connecticut Avenue east of Rock
Creek, NW
Biltmore Street extended east of
RockCreek, NW
Ontario extended and Rock Creek
Parkway
separated
0
0.00
0.00
0.00
0.00
0.00
0
0
0
7
0.00
0.00
0.00
0.160
0.00
0.00
0.00
8.25
0.00
0.00
0.00
1.18
0.00
0.00
0.00
2.00
0.00
0.00
0.00
0.25
separated
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
20
Combined Sewer System Model Results Period: April, May June 2016
NPDES No.
042
043
044
045
046
047
048
049
050
051
052
053
054
056
057
058
060
Description
Harvard Street and RockCreek
Parkway, NW
Adams Mill Road South of Irving
Street, NW
Kenyon Street and Adams Mill Road,
NW
Adams Mill Road and Lamont Street,
NW
Park Road south of Piney Branch
Parkway, NW
Ingleside Terrace extended and Piney
Branch Parkway
Mt. Pleasant Street extended and
Piney Branch Parkway
Piney Branch and LamontStreet, NW
28th Street west of 16th Street, NW
Olive Street extended and Rock Creek
Parkway, NW
O Street extended and Rock Creek
Parkway, NW
O Street west of Rock Creek Parkway,
NW
West Side of Rock Creek300 ft. south
of Mass. Ave, NW
Normanstone Drive extended west of
Rock Creek, NW
28th Street extended west of Rock
Creek, NW
Connecticut Avenue and Rock Creek
Parkway, NW
P St and 26 th St, NW
SUBTOTAL
Total
Number of
CSO
Duration of Avg Duration
Overflows
Overflow
of Overflow
Overflow
(Occurrences) Volume (mg)
(hrs)
(hrs)
Maximum
Duration of
Overflow
(hrs)
Minimum
Duration of
Overflow
(hrs)
0
0.00
0.00
0.00
0.00
0.00
3
0.14
1.00
0.33
0.50
0.25
0
0.00
0.00
0.00
0.00
0.00
3
0.01
1.00
0.33
0.50
0.25
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
2
10
0
0.02
8.061
0.00
0.50
15.00
0.00
0.25
1.50
0.00
0.25
2.50
0.00
0.25
0.25
0.00
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
separated
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
separated
separated
0
0.00
8.39
0.00
TOTAL
389.66
C:\Users\ahchilmeran\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.Outlook\A488XXJ4\[Q2Y2016_Report_8July2016.xls
Prepared by: Greeley and Hansen LLC and Limno-Tech, Inc.
21
NPDES No.
Description
Anacostia CSOs
Chicago St and Railroad Station SE
005
Good Hope Road, West of Nichols
Ave.,SE
006
13th Street and Ridge Place,SE
007
2nd Street, 300 feet North of N Place,
SE
009
O Street SewagePumping Station, SE
(pumped Overflow)
010
South of Main Sewage Pumping
Station, SE (pumped overflow)
011
South of Main SewagePumping
Station, SE (gravity overflow)
011a
North of Main SewagePumping
Station, SE (Tiber Creek)
012
4th and N Streets, SE
013
014
015
016
017
Barney Circle andPennsylvania Ave,
SE
018
Northeast Boundary - Swirl Effluent
019
Northeast Bound. - Swirl Bypass
019
SUBTOTAL
Potomac CSOs
Bolling AFB
003
23rd Street, North ofConstitution Ave,
NW (Easby Point)
020
Northeast ofRoosevelt Bridge, NW
021
022
024
31st & K St NW
025
Wisconsin Avenue andK St., NW
026
Water Street West ofStreet, NW
027
028
Canal Road 1000 feet east of Rock
Creek,NW
029
SUBTOTAL
Number of
Overflows
(Occurrences)
CSO
Overflow
Volume
(mg)
19
3.13
Total
Maximum
Duration of Avg Duration Duration of
Overflow
of Overflow
Overflow
(hrs)
(hrs)
(hrs)
51.25
Minimum
Duration of
Overflow
(hrs)
2.70
8.50
0.50
separated
9
2.56
9.75
1.08
2.00
0.25
10
1.76
15.75
1.58
2.25
0.50
12
40.21
9.75
0.81
2.75
0.25
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
0
10
10
8
7
14
0.00
2.11
3.40
0.67
2.15
7.58
0.00
20.00
17.00
8.25
7.75
36.50
0.00
2.00
1.70
1.03
1.11
2.61
0.00
4.50
3.00
1.75
2.00
6.50
0.00
0.25
0.50
0.50
0.25
0.50
10
12
4
4.04
133.78
35.01
236.39
15.75
61.50
3.25
1.58
5.13
0.81
2.75
12.00
1.25
0.25
1.25
0.50
0
0.00
0.00
0.00
0.00
0.00
5
11
11
5
4
0
5
12
0.40
126.78
2.51
6.69
0.32
0.00
3.33
1.22
8.00
26.00
20.50
12.75
2.75
0.00
6.00
17.50
1.60
2.36
1.86
2.55
0.69
0.00
1.20
1.46
2.50
4.25
3.50
4.25
1.00
0.00
1.75
2.25
0.50
0.25
0.25
1.00
0.25
0.00
0.25
0.50
7
3.63
144.87
6.50
0.93
1.75
0.25
0
0.00
0.00
0.00
0.00
0.00
0
0
0
7
0.00
0.00
0.00
0.160
0.00
0.00
0.00
8.25
0.00
0.00
0.00
1.18
0.00
0.00
0.00
2.00
0.00
0.00
0.00
0.25
Rock Creek
031
032
033
034
035
036
037
038
039
040
041
042
Pennsylvania Avenue, East Rock
Creek, NW
N Street extendedwest of 25th
Street,NW
23rd and O Streets, SW
22nd Street south of Q Street, NW
22nd Street South of Q Street, NW
Northwest of Belmontand Rock Creek
and Potomac Parkway
North of Belmont Road,east of
Kalorama Circle, NW
Connecticut Avenue east of Rock
Creek, NW
Biltmore Street extended east of
RockCreek, NW
Ontario extended and Rock Creek
Parkway
Harvard Street and RockCreek
Parkway, NW
separated
separated
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
NPDES No.
043
044
045
046
047
048
049
050
051
052
053
054
056
057
058
060
Description
Adams Mill Road South of Irving
Street, NW
Kenyon Street and Adams Mill Road,
NW
Adams Mill Road and Lamont Street,
NW
Park Road south of Piney Branch
Parkway, NW
Ingleside Terrace extended and Piney
Branch Parkway
Mt. Pleasant Street extended and
Piney Branch Parkway
Number of
Overflows
(Occurrences)
CSO
Overflow
Volume
(mg)
3
0.14
1.00
0.33
0.50
0.25
0
0.00
0.00
0.00
0.00
0.00
3
0.01
1.00
0.33
0.50
0.25
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
2
0.02
0.50
0.25
0.25
0.25
10
0
8.061
0.00
15.00
0.00
1.50
0.00
2.50
0.00
0.25
0.00
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
Piney Branch and LamontStreet, NW
28th Street west of 16th Street, NW
Olive Street extended and Rock Creek
Parkway, NW
O Street extended and Rock Creek
Parkway, NW
O Street west of Rock Creek Parkway,
NW
West Side of Rock Creek300 ft. south
of Mass. Ave, NW
Normanstone Drive extended west of
Rock Creek, NW
28th Street extended west of Rock
Creek, NW
Connecticut Avenue and Rock Creek
Parkway, NW
P St and 26th St, NW
SUBTOTAL
Total
Maximum
Duration of Avg Duration Duration of
Overflow
of Overflow
Overflow
(hrs)
(hrs)
(hrs)
Minimum
Duration of
Overflow
(hrs)
separated
0
0.00
0.00
0.00
0.00
0.00
0
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
separated
separated
0
0.00
8.39
0.00
TOTAL
389.66
C:\Users\nbell\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.Outlook\F3OC23LQ\[Copy of Q2Y2016_Report_8July2016.xlsx]Q2Y2016
Prepared by: Greeley and Hansen LLC and Limno-Tech, Inc.

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