ST9304-CS 960514 DALLAS COUNTY
PUBLIC WORKS
May 14, 1996
05-15-96.~ .:,/ ! ..
Mr. Ken Griffin, P.E.
Assistant City Manager/City Engineer
City of Coppell
255 Parkway Boulevard
Coppell, Texas 75019
Re: Belt Line Road - Project//490-403.1/91-829
(Denton Tap to MacArthur Boulevard)
Drainage Meeting: May 9, 1996-
Dear Mr. Griffin:
The following list of items were discussed at the meeting May 9, 1996. If any of these items
are incorrect, please contact me so that the meeting notes may be amended.
Attending: Ken Griffin, City of Coppell
Mike Martin, City of Coppell
Tom Knicker, Halff Associates
Jill, Brim, Dallas County
Item 1 - four options were proposed for drainage basin B.
Option I - lower the runoff coefficient of the TU Electric (TUE) property. Mr.
Griffin stated that he would make contact with TUE to determine their
future development plans for the property. This option could have
positive repercussions along the entire project.
Option !! - utilize the existing 10' drainage easement at Station 12+00. The existing
easement is between a warehouse and a railroad spur. The proposed pipe
is 48" in diameter. The estimated cost for this option is $200,000
exclusive of. the necessary additional easement costs.
Option III - acquire a new drainage easement approximately 700' east of the existing
10' drainage easement. The estimated cost for this option is $150,000
exclusive of the necessary additional easement costs.
Option IV- increase the size of the drainage trunk line for basin C and the take
drainage basin B to the outfall of basin C. The estimated cost for this
option is $450,000.
411 EImStreet Dallas, Texas 75202 653-7151
I
Mr. Ken Griffin, P.E.
May 14, 1996
Page 2
Item 2 - Two options were proposed for drainage area J-5.
Option I - design the system to accept the runoff from J-5 at the existing elevation.
Due to the elevation of the downstream system, this will result in a 0.00%
grade in the basin J trunk line.
Option II - design the system to pick-up the runoff from J-5 at the future developed
and filled elevation. The system would be temporarily plugged at lateral
J-5, and a swale would be construcLed to allow J-5 to drain to Grapevine
Creek until the area is filled and developed.
Item 3 - Coppell agreed to allow the HGL for the 10 year event on Grapevine Creek to
be used as the beginning HGL for the pipe design. Information will need to be
provided to show that the 100 year HGL for Grapevine Creek does not inundate
additional areas due to the pipe design.
Item 4 - Coppell needs a preliminary copy of the right-of-way document for the corner
clip at the southwest corner of Belt Line and MacArthur. The document should
also show any proposed slope easements and drainage easements.
Item 5 - Coppell needs to know the proposed limits and areas of the Item 2, Option II
drainage easement; the slope easement along Belt Line Road; and the drainage
easement at the Grapevine Creek bridge for the Billingsly property.
Items 4 and 5 will be provided by the County's consultant by Friday, May 17, 1996. Please call
me at 653-7151 if you have any questions.
Sincerely,
filM. Brim, 1~ E ngineer
JmB:\jdjb ~
xc: Tom Knicker, P.E., Halff Associates
829'dVIETNGNT$.LTR