ST9301-CS 960718oou L; r' uTIlffles
ENGINEERING
320 East Jefferaon Dallas, Taxaa 75203 (214) 948-4560
July 18, 1996
Abel Saldana, P.E.
Dallas County Public Works
411 Elm Street, 4th Floor
Dallas, Texas 75202
Re: Sandy Lake Rd from McArthur Blvd to Coppell E. City Limits
Dear Mr. Saldana:
Proposed paving and drainage plans for the subject project in
the City of Coppell have been reviewed. We offer the following
comments regarding impact on Dallas Water Utilities Department
facilities:
1. Sheet 6: The proposed paving cut of 4.5' leaves only 2.5'
of cover over the existing 30" water main, which is excessively
shallow. Please raise the grade between sta. 17+00 & 19+00 by
a minimum of one foot.
2. Sheet 12: The 30" water main horizontal gate valve access
manhole and bypass valve (at sta. 46+20, 20' left) will require
a routine adjustment and an appurtenance adustment to the final
paving grade.
3. Sheet 12: The ongoing 60" Irving water main construction
shown in the profile appears to conflict with the existing 30"
DWUD water main. However, their (Irving's) plans show this 60"
water main to be at a much lower elevation. Please review and
provide the necessary correction.
4. Sheet 13: The 60" water main pitot manhole at paving sta.
49+70, 60' left will require an appurtenance adjustment to
match the fill slope grade outside of pavement.
5. Sheet 14: The 60" water main air valve manhole and vent (at
pav. sta. 55+40, 40' left) will require an appurtenance
adjustment to match the fill slope grade.
6. Sheet 16: The recessed inlet at pav. sta. 65+30, 45' left
conflicts with the access manhole for the operating nut on the
66" horizontal gate valve. Please move the sag point or use a
regular inlet rather than a recessed inlet. The water manhole
will require an appurtenance adjustment to final grade.
A city utility providing Dallas with water purification and distribution, waste water collection and treatment
7. Sheet 33: The proposed 72"RCP storm drain at pav. sta.
46+00, 15'right clears the existing 60" steel water main by
only 0.38 feet. On your plans, please annotate the elevation
of the top of the water main as 437.6+; also add a caution note
to this sheet to warn the contractor of the close vertical
proximity of this water transmission main.
8. Ail paving sheets: Please show all proposed street light
locations in the median so we can determine their impact on the
existing 30" water main. It is our understanding that the
street lights in the adjacent Sandy Lake Road project (from
Denton Tap to MacArthur) utilize 24" diameter drill shafts ten
feet deep, which conflict with the existing 30" water main.
Unless the County redesigns or adjusts to clear the design
conflicts as noted under items #1 & 6 and possibly #8, a
contract will be utilized for the water main relocations
necessary to alleviate conflicts. Also, the County will
provide funding for any water relocations due to drainage
conflicts.
In the event that all conflicts are resolved, Dallas Water
Utilities Department Construction Services will perform the
routine and appurtenance adjustments listed under items #2, 4,
5 & 6, rather than implementing a contract to perform these
minor items.
Should you have any questions, feel free to contact Jun Battad
at 948-4591.
Brian H. Cowan, P.E.
Project Manager
Relocations
J. Milstead
J. Battad
A. Blair-Robinson
C. Long
File
96200MF2.SandyEast