ST9304-CS 970204 r'- 'b06
P.O. Box 478
Coppell, Texas 75019
The City With A Beautiful Future 214-462-0022
February 4, 1997
Jill Brim, P.E.
Public Works Department
Dallas County
411 Elm Street
Dallas, Texas 75202
Re: Belt Line Road MacArthur Blvd. to Denton Tap Road (ST 93-04)
Dallas County Project # 490403.1 / 91-829
Dear Ms. Brim:
The City of Coppell has received and reviewed the referenced plans and has the following
comments to offer:
1. Any brick paver bands that need to be removed at driveways must be replaced as per the
City of Coppell standards.
2. Label the existing and proposed right-of-way on all sheets. Also label all slope and/or
drainage easements.
3. Show location of street lights and location of conduit for street lights.
4. Provide detail of button layout for left and right turn lanes. In the detail show button
spacing as 30' on centers double Type I white 4' diameter buttons. Install 30"x 40"(~)
3-SR sign at the end of the right turn deceleration lanes.
5. Who will be acquiring the slope and drainage easements in the City of Dallas?
6. I have had conversations with Baty Houston at the TU Electric Power Plant about the
railroad spur crossing. He stated that at this time they had no intentions to replace the
railroad spur across Belt Line Road but he would like to to replace it in the future when
it may be needed. With this being the case, the City would recommend that the curb
continue through the paving section across the existing railroad spur and let TU Electric
come back and remove the curb sometime in the future when they need to reinstall the
railroad crossing. Also, how does raising Belt Line Road across the railroad spur affect
the existing track?
,. >~ 7. Provide traffic signal information for intersections at Moore Road/Belt Line Road-and
', "" Mockingbird Lane/Belt Line Road. Also, these lights need to interconnect with light at
Belt Line Road and MacArthur Blvd.
8. Due to the extensiveness of the full brick paver intersections at Moore Road / Belt Line
Road and Mockingbird Lane/Belt Line Road, the City would like to consider using only
brick paver bands.
9. The proposed driveway at Station 115+98.51 needs to be coordinated with the
development which is under construction today. Also, the proposed slopes onto this
property need to be coordinated. Contact Eugene Middleton, with Winkleman &
Associates, at (214)490-7090.
10. On the drainage calculation sheet some of the times of concentration appear too long for
several of the drainage areas. Please provide additional information.
11. Provide a manhole on Storm Sewer Line "A" at Station 0+00.
12. Storm Sewer Line "B" appears as though there is not enough cover over the pipe.
Provide a minimum of 18" cover over pipe. Also, at the outfall of the pipe can the
proposed ditch be constructed inside the existing ditch with 4:1 slopes?
13. On storm sewer sheet D8, the plans show 2 hydraulic grade lines.
14. Provide concrete rip rap at all storm sewer ouffalls to prevent erosion.
15. A handrail should be provided on the upstream side of Storm sewer Line "E" & Line "F"
due to the severe drop off. Also, a note indicates that there is a detail for the 6"
concrete slope protection but the detail was not found in these plans.
16. Relocate the curb inlet on the south side of the mad to the east so that it connects to the
most easterly 36" RCP.
17. A typical section needs to be provided for Moore Road.
18. All existing sewer manholes, water valves, etc. must be adjusted.
19. All raised islands need to have brick pavers.
20. Show the existing locations and proposed locations of railroad signals and gates at Moore
Road and Mockingbird Lane.
21. Show the low chord elevation of the bridge.
22. Sidewalks, bridge lights and bridge railings need to be provided on the bridge similar to
what is on the bridge on Moore Road and Mockingbird Lane. I have provided copies
of plans showing these details.
There are other minor comments made in the plans that need to be addressed. If you should
have any questions please feel free to contact me at your convenience.
Sincerely,
Michael A. Martin, E.I.T.
Assistant City Engineer