ST9302-CS 960517dallas water utilities
PIPELINE DESIGN ENGINEERING
320 East Jefferson Room 211 Dallas, Texas 75203
(214) 948-4620 FAX (214) 948-4599
May 17, 1996
Ken Griffin, P.E., City Engineer
City of Coppell
Sandy Lake Road from Denton Tap to MacArthur Blvd.
Review Comments for 30" RC Water Design
My staff has reviewed the construction plans for the relocation
of the DWU 30" RC water transmission main in Sandy Lake Road
which serves the City of Flower Mound. The most critical item
of concern is the shutdown time required for implementing the
water main adjustments to clear the paving and drainage
improvements. Per the attached memo from Phil Boyd, Manager of
Wholesale Services Division, a "winter-time, low-demand,
shutdown not lasting much longer than 48 hours" is the bottom-
line requirement that must be met.
Please submit a plan of action whereby this requirement can be
met while utilizing the current design alignment in the same
trench as the existing main. Or, alternatively, please
redesign with an offset alignment that will allow the existing
main to stay in service during construction of the proposed
main; tie-ins at each end of such an offset are estimated to
take 48 hours each. In either case, please take into account
the locations of the proposed 24" diameter drill-shaft base
supports for the street lights which 'are in the same vicinity
along the median as is the water main.
Additional comments are as follows:
1.) Call for temporary strap-welded dished-head test plugs at
each end of each lowering for pressure testing prior to tie-in.
2.) Provide a reference to Appurtenance 414W-9 and 414W-10 for
type 2 air valve installations.
3.) Call for butt-strap closures at each tie-in.
4.) Call for "bar-wrapped" concrete cylinder pipe, which has
replaced "pre-tensioned" pipe.
5.) Provide a reference to Appurt. 414W-11 in the installation
note for a horizontal gate valve.
6.) Call out all horizontal and vertical deflection angles in
degrees and minutes.
A city utility providing Dallas with water purification and distribution, waste water collection and treatment
7.) Add a General Note to the plans: ,,Contractor to contact
DWU Water Operations Supervisor, John Wilson, at 670-8063, or
his assistant at 670-8064, at least 10 working days in advance
of scheduled tie-ins to request 30" water main shutdown and
emergency water main connection activation. Shutdowns are
limited to 48 hours in duration and are limited to the months
of October through February."
8.) All DWU pipeline construction must be shown on plans with
a DWU File number in the title block. Utilize File 685W-678A
for this project. Provide sheet numbers inside a 3/4" diameter
circle adjacent to the title block; start with sheet 1. Mylar
reproducible originals must be supplied to DWU at the
completion of construction showing all "as-built" information
pertinent to the DWU water main.
Should you have any questions, feel free to call A1 Battad at
948-4591.
Project Manager
Relocations/DART
Attachment
J. Milstead
P. Boyd
J. Wilson
A. Battad
File
96138MF1.KGriffin
DATE
10
SUBJECT
Memorandum
April 25, 1996
RECEIVED
CITY OF DALLAS
Brian Cowan, Project Manager
Relocations/DART
Shutdowns of 30" Flower Mound Water Transmission Main for Paving and Drainage
Improvements:
I. Denton Tap Road from Highland Drive to S.H. 121;
2. Sandy Lake Road from Denton Tap Road to MacArthur Boulevard
We have reviewed your two memos dated April 15 and 22 regarding the two paving
improvement projects requiting shutdown of Dallas' 30" Flower Mound water transmission
main for relocation. This water transmission main is the only source of treated water for the
Town of Flower Mound, and the shutdowns must be accomplished in a manner that will not
result in Flower Mound running out of water. Flower Mound has enough storage to sustain
a winter-time, low demand, shutdown not lasting much longer than 48 hours. Some
assistance in maintaining a supply to Flower Mound during the 48 hour shutdown can be
obtained from an emergency connection Dallas maintains with the City of Lewisville near the
intersection of FM 3040 and Valley Parkway. This emergency connection could provide a
minor amount of leeway if the shutdown extends past 48 hours; however, it cannot be relied
upon to maintain a usable supply to Flower Mound.
The following comments apply to both paving projects:
A shutdown of 48 hours can be sustained by Flower Mound providing the following
conditions are met:
a. The shutdown is not longer than 48 hours.
b. The emergency connection with Lewisville is activated.
c. The shutdown occurs when Flower Mound's demand requirements are low
enough to allow it. It is anticipated that this period of time would be during
the lower demand period of October through February.
d. The shutdown is coordinated in advance through Water Operations.
Providing it is necessary to place a note on the design plans and within the project
construction specifications, it should be noted that whoever is in charge of the
construction of the relocation must contact DWU's Water Operations Supervisor,
John Wilson, or his assistant at phone number 670-8063 or 670-8064, at least 10
working days in advance of the required shutdown. John will make the necessary
S/N 2761-04-018
"The Only Reason You And 1 Are Here Is To Serve The Citizens Of Dallas"
SUP-00987A
April 25, 1996
Brian Cowan
Page 2
contacts to ensure the shutdown is coordinated with DWU and Flower Mound
personnel.
Additionally, these shutdowns must be coordinated in advance with Water Operations (John
Wilson) prior to September 1996 for compatibility with DWU's winter maintenance
shutdown and operations schedule.
Please note that a shut-down of approximately three months is not acceptable or feasible for
the Sandy Lake Road - Denton Tap Road to MacA_rthur Boulevard paving project.
Please continue to keep me informed of the progress on these important paving projects. If
you have any questions, please feel free to call me at 670-5887.
Phillip L. Boyd
Manager
Wholesale Services Division
c: Dennis Cave
Mike Rickman
Charles Stringer
John Wilson