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TRA
Experienced Intermittent Outflows Due to Heavy Rain
Events
Grand
Prairie - The Trinity River Authority’s
Northeast Lakeview Interceptor began intermittently
overflowing from a manhole on Sunday, September 13
after heavy rains caused hydraulic overloading in
the pipeline resulting in capacity restrictions.
During
heavy rain events, such as those experienced during
the past weekend in the DFW area, it is common for
storm water to cover manholes and underground
wastewater pipes. When this occurs, water gains
access to the pipeline system through openings in
the manholes and cracks in the pipelines. The
pipelines become hydraulically over loaded and
wastewater spills occur.
No public
drinking water supplies were threatened or
contaminated by this overflow. The Texas Commission
on Environmental Quality (TCEQ) requires all
wastewater overflows in excess of 100,000 gallons to
be reported to TCEQ, the public, and other
designated public officials.
TRA
estimates that approximately 104,800 gallons of
wastewater outflowed from the manhole, located south
of Camp Wisdom Road on the west side of HWY 1382,
Old Belt Line Road, into the Mountain Creek drainage
basin. The manhole, which is downstream of a pump
station, outflowed intermittently when the pump
station periodically cycled on to transport
wastewater flows. This occurred between 12:00 p.m.
Sunday, September 13 and 5:00 p.m. on Monday,
September 14. The impact of this inadvertent spill
was minimized by large quantities of storm water
which served to dilute the wastewater in the
Northeast Lakeview Interceptor.
All
required city, county and state officials have been
notified of this event by TRA.
For more information please
contact John Jadrosich or Debbie Bronson at (817) 467-4343
Texas
Commission on Environmental Quality
Chapter
319 – General Regulations Incorporated Into Permits
Rule Log
No. 99031-319-WT
Figure: 30 TAC §319.303
NOTICE
OF SPILL FROM A WASTEWATER FACILITY
A spill
from a wastewater treatment or collection facility
has occurred.
INFORMATION ABOUT THE SPILL
Facility
Name: Trinity River Authority’s Central Regional
Wastewater System, Northeast Lakeview Interceptor
Contact
for further information: Debbie
Bronson - Public Information (817) 467-4343
Location
of the spill: South of Camp Wisdom Road on the
west side of HWY 1382, Old Belt Line Road
Estimated
time and date of spill: Sunday, September
13, 2009 at 12:00 p.m. to Monday September 14, 2009
at 5:00 p.m.
Estimated
volume of the spill (number of gallons):
104,800 gallons
Type of
spill: (domestic) (industrial) (other)
Explain other
Domestic
Area
potentially affected: Mountain Creek
drainage area in Grand Prairie
Suspected
cause of spill: Hydraulic overload due to
heavy rainfall
THE
FOLLOWING ACTIONS HAVE BEEN TAKEN:
X Appropriate local government
officials have been notified
X TCEQ regional office has been
notified
-
The
spill has been contained
-
Increased monitoring of water supply systems has
been initiated
-
The
cause of the spill has been corrected
-
Clean-up activities are underway/completed
-
Other_____________________________________________________________
As listed in
the Sanitary Sewer Overflow (SSO) Outreach
Initiative Final Corrective Action Plan, submitted
by the Authority and approved by the Texas
Commission on Environmental Quality (TCEQ), the
Authority annually performs internal line video
inspection and line cleaning activities. Problem
areas identified are scheduled for corrective
action. Also, design of a relief project is
underway for the Mountain Creek Interceptor,
Sections 5 and 6 that will increase the diameter of
the pipe from 72 to 96 inches, resulting in
additional line capacity. Construction will begin
approximately April 2010 and is expected to be
complete by late 2011. In addition, preliminary
design activities are underway to increase the East
Mountain Creek Interceptor from 33 and 36 inches to
60 inches in diameter, which will result in
increased hydraulic capacity. Construction is
expected to begin in early 2011.
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