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September 30, 1988
Mr. Steve Tencza, P.E.
Chief of Plan Review !~"'
Texas Department of Health
Water Hygiene Division
1100 W. 49th Street
Austin, Texas 78756-3192
Re: Village Parkway Pump Station ~/~/;~×iz
City of Coppell, Texas
Dear Mr. Tencza:
Enclosed for your review is an engineering report, plans, and
specifications for the above referenced project. We are
currently advertising this project and anticipate opening bids on
October 27, 1988. It is our intention to begin construction of
the pump station by early December.
Ginn, Inc. has prepared these plans and specifications under the
direction of the City of Coppell. Our firm has acted as their
City Engineer/Consultant since 1984.
As indicated in our June 16, 1988 letter regarding the Village
Parkway Reservoir (currently under construction), the supply main
from the City of Dallas rate of flow controller to the reservoir
is included in the pump station project.
If you need additional information or clarification of these
documents, please contact our office.
Sincerely,
Sanford W. ease, P.E.
Project Manager
Enclosures
cc: Alan Ratliff, City Manage~
Russell Doyle, P.E., City Engineer
Steve Goram, Director of Public Works
H. Wayne Ginn, P.E.
File 380
FORWARDED TO
.MAYOR AND COUNCIL
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VILLAGE PARKWAY PUMP STATION
CITY OF COPPELL, TEXAS
ENGINEERING REPORT
SEPTEMBER 30, 1988
The City of Coppell is a rapidly growing community located in
northwest Dallas County and southern Denton County. The city
covers approximately 14 square miles and has an estimated current
population of 15,400. The average day water demand for the City
in 1987 was approximately 2.0 MGD with a peak day of
approximately 5.8 MGD. Based on the current zoning, the ultimate
development for the City of Coppell is projected to yield an
average day water demand of approximately 12 MGD with a projected
peak of approximately 31 MGD.
The City of Coppell purchases the majority of its water from
Dallas Water Utilities through a rate of flow controller located
at the existing pump station and ground storage tank on Sandy
Lake Road (see location map). The City has one water well which
is capable of supplying ±0.3 MGD to the system.
The present ground storage tank has a capacity of 0.5 MG and the
pump station can only deliver ±6.5 MGD on a peak basis. The lack
of additional space and poor soil conditions make expansion of
the existing facilities impractical.
The City of Coppell secured a site for the construction of
additional water distribution facilities approximately 1/2 mile
northwest of the existing station. Design was then initiated on
the facilities. Due to the hydraulic characteristics and
pressure limitations of the distribution system, the decision was
made to design the facilities for a future pumping capacity of
±20 MGD with 8-10 MG of total ground storage. This capacity is
projected to meet the demands of the City of Coppell through the
year 2010.
The initial phase of this project will consist of the
construction of one 4.0 mg ground storage tank, a pump station
with a firm initial capacity of 10 MGD, and a supply main from
the rate of flow controller.
The Village Parkway Reservoir which is currently under
construction will be a 4.0 MG prestressed, wire wound concrete
reservoir which is designed and constructed in accordance with
the AWWA D-110-86 standard. The reservoir will have a structural
floor slab supported on piers drilled into shale.
The pump station is designed to provide an architectural
appearance similar to the other municipal buildings within the
City of Coppell. The split level structure will allow operators
to overlook the pump room from the operators office through
reinforced safety glass windows. The finished floor elevation of
the pump room will be 450.00' msl which is approximately 2 feet
above the 100 year flood elevation for the site.
Ginn, Inc. Consulting Engineers
Project No. 380
Village Parkway Pu Station
City of Coppe11, Texas Page 2
Engineering Report (cont.) September 30, 1988
The pump station is designed to allow dual flow on the suction
lines to each pump and discharge to the system. The discharge
lines from the station are connected to a 24" cross-town
waterline to the elevated tank and also connected to the
distribution system via a 16" water main. The station is piped
and valved to allow repair of any pump or the venturi meter
without a complete shut down of the station.
The pump station will have an initial firm capacity of 10 MGD
with a peak capacity (two pumps running) of +16 MGD. The station
will be provided with dual grid power service to prevent loss of
power in an emergency. Alarm systems will notify the Police
Dispatcher of a pump failure, low tank level, ect.. Meters and
recorders will monitor flows into the ground storage tank, flows
to the system, and elevated tank levels.
The site will have a six (6) foot chain link security fence on
all sides except along Village Parkway. On this side, a
decorative brick and iron rail fence will be provided.
The offsite water main from the rate of flow controller to the
reservoir will be constructed of 36" PCCP pipe. The line is
designed to maintain approximately six feet of cover along its
route. There are no connections to the 36" main between the rate
of flow controller and the new reservoir. Provisions have been
made for the possible future placement of a new rate of flow
controller on the main.
Respect fully Submitted,
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Sanford W. Case, P.E. ~ ........................... ....
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Ginn, Inc. Consulting Engineers
Project No. 380