HomeMy WebLinkAboutIR 8928FORMAL REPORT TO CITY COUNCIL MEMBERS
To the Mayor and Members of the City Council
No. 8928
April 1, 2008
Page 1 of 2
SUBJECT: February 29, 2008, Southwest Fort Worth Water Service Disruption
The purpose of this Informal Report is to advise the City Council on the causes of the water service
disruption in southwest Fort Worth from February 29 to March 1, 2008 and the steps that the Water
Department is taking to try to minimize the effects of this type of incident.
Background
On the morning of February 29, 2008 a squirrel caused the failure of two transformers at the Oncor
substation that provides power to the Alta Mesa and Russom Ranch Pump Stations. The pump
stations were just beginning to fill the elevated storage tanks at Sun County and Armstrong Ranch.
The loss of power and water demand resulted in the two elevated storage tanks being drained and
the system pressure in this area of Fort Worth dropping below the state requirement of 20 pounds
per square inch (psi). The power was quickly restored and water pressure brought back up to state
standards. Because the system pressure dropped below 20 psi a boil water notice was required by
the Texas Commission on Environmental Quality regulations in conformance with Texas
Administrative Code 30 Chapter 290.46(s). The boil water notice was rescinded on March 1, 2008
after required bacteriological testing showed negative results.
System Redundancy
This area of Fort Worth is served by the Alta Mesa and the Russom Ranch pump station. These
pump stations pump water into the Armstrong Ranch and the Sun Country elevated storage tanks.
The elevated storage tanks maintain and stabilize system pressure within this area.
The Water Department employs a process of cycling the tank levels in order to minimize water age
and maintain water quality. The process of cycling the tanks consists of allowing the system usage
to significantly lower the tank water levels prior to refilling the tanks using the pumping stations,
thereby ensuring the water in the tank remains fresh. This procedure has worked well over the
years in ensuring high water quality in the distribution system.
All pumping stations and elevated storage tanks are equipped with supervisory control and data
acquisition (SCADA) equipment, which allows staff to monitor and control equipment and
processes at all times from the Holly Water Treatment Plant. At the time of the power outage, the
SCADA control room notified supervisors who contacted Oncor regarding the cause and expected
duration of the outage. The response from Oncor and Water Department staff was rapid and
corrected the problem within one hour.
Redundancy to this area of Fort Worth will be substantially improved in the near future, with a third
pump station, the McCart Pump Station, expected to begin operation in three months. The McCart
Pump Station is located at the intersection of McCart and Risinger Road, approximately five miles
south of the Alta Mesa Pump Station. The geographic separation, coupled with a separate source
of power from a different substation, will improve the overall reliability to this area of Fort Worth.
ISSUED BY THE CITY MANAGER FORT WORTH, TEXAS
11-INFORMAL REPORT TO CITY COUNCIL MEMBERS No.- 8928
• the Mayor and Members • the City Council April 1, 2008
Page 2 of 2
SUBJECT: February 29, 2008, Southwest Fort Worth Water Service Disruption
The Water Department participated in an After Action Review with EOC, Health Department, I J
and Public Information staff on March 20, 2008. The following actions were identified:
Areas to Sustain
• Bottled Water Supply Services from Coca Cola
• Bottled Water Distribution Point Operations
• Laboratory Services capabilities for sampling and testin•! ,
Areas for Improvement
• Protection of transformers/substations (Oncor)
• Backup electrical service at pump stations
• Public Notification/Communication through Reverse 91 1,Mass Call and Call Centers
• Pre-Planning for Distribution Points and Notification Areas
• Increase Number of Bottled Water Suppliers for Emergency Conditions
• Communication With Emergency Water Distribution Points
• Traffic and Crowd Control at Emergency Water Distribution Points
Attimchment: Map of Aff ecttedA re -a
ISSUED BY THE CITY MANAGER
FORT WORTH, TEXAS
for genera( purpose ony. Contact City M Fort Worth Department of Engineering at 617 - 392 -8426 to get plan information for design or construction purposes.
ps with aerial and contour information are prohibited from reproduction and distribution without prior consent from the North Central Texas Council of Govemments.
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