ST9302-CS 960517 (3)SENT BY:CITY OF DALLAS ; 5-17-96 ; 12:07 ; WATER UTILITIES~ 214 804 3570;# 2/ 8
ClCtlIOS tUQTer uTilitieS
PIPELINE DESIGN ENGINEERING
320 East Jefferson Room 211 Dellae, Texas 75203
(214) 948-4620 FAX (214) 946-4599
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.
~.) Provide a re~erence 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 puritiCal'Or', e. Hd diStrilUutiO,%, waste water collection and treatn%ent
SENT BY:CITY OF DALLAS ; 5-17-96 ; 12'08 ; WATER UTILITIES~ 214 004 8570;# 3/ 3
7.) Add a General Note to the plans: "Contractor to contact
DWU Water Operat].on~ 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 l. 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
Re locat i OhS / DART
Attachment
c: ~.'~"Milstead
P. Boyd
J. Wilson
A. Battad
File
96138MF1.KGriffin