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TRA
Experienced Wastewater Overflows
Grand
Prairie – A Trinity River Authority Metering
Station began overflowing wastewater on Monday,
October 26, 2009 after heavy rains caused hydraulic
overloading in the Authority’s East Mountain Creek
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 158,100 gallons of wastewater
outflowed from the Meter Station 5.3M, located
one-half mile west of HWY 1382, one-half mile east
of Bardin Road, and three-fourths mile south of
I-20, discharging into a low lying area of the
Mountain Creek drainage basin. The Meter Station
measures flows from the City of Grand Prairie that
flow through a City of Dallas 30” Interceptor to
TRA’s East Mountain Creek Interceptor.
This began at 9:45 a.m. Monday, October 26, 2009.
The overflow stopped at 3:45 p.m., October 27, 2009.
The impact of this inadvertent spill was minimized
by large quantities of storm water which served to
dilute the wastewater in the East Mountain Creek
Interceptor and Mountain Creek drainage basin.
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, East Mountain Creek
Contact
for further information: John
Jadrosich - Public Information (817)
467-4343
Location
of the spill: ½ mile west of Highway 1382, ½
mile east of Bardin Road, and ¾ mile south of I-20
Estimated
time and date of spill: Starting at 9:45
a.m. on October 26, 2009 and ending at 3:45 p.m.,
October 27, 2009
Estimated
volume of the spill (number of gallons):
158,100 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 governmental 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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