ST8402-CS 890517 GINN, INC.
May 17, 1989
Mr. Russell Doyle, P.E.
city Engineer
City of Coppell
P.O. Box 478
Coppell, Texas 75019
Re:
Denton Tap Road
Lake Road,
Approvals.
CONSULTING
Improvements from Belt Line Road to Sandy
and from Sandy Lake Road to Denton Creek - FEMA
Dear Mr. Doyle:
This letter is in response to your Handwritten Memorandum of May
10, 1989, copy attached. Attached you will find additional
documentation including the Conditional Letter of Map Revision
for the Denton Tap Road bridge structures over Grapevine Creek,
which should complete your files regarding to the floodplain
aspects of the subject projects. Please note that the
Conditional Letter for the Grapevine Creek bridge structures
requires that as-built drawings, HEC-2 hydraulic models and
supporting data must be prepared and submitted to FEMA for
verification of compliance with the Conditional Letter as soon as
construction is completed. It is our intention to furnish these
services under special services ' ro'ect, however you m~y
contract direct~Horn and Assoc~tes, Inc. for this
if you wish. Please let us know your intentions regarding the
foregoing as soon as possible.
On the advice of our Floodplain Hydraulics/Hydrology Consultant,
Kimley-Horn and Associates, Inc., there was no submittal prepared
or made for the widening of the Cottonwood Branch bridge
structure. Their opinion of the plans to widen the existing
bridge structure was that since the hydraulic cross section of
the bridge was not being changed, the affects on the floodplain
and base flood elevations would be negligible.
Please call me if you have any questions.
Sincerely,
John C. Karlsruher, P.E.
Project Engineer
attachment
cc:
H. Wayne Ginn, P.E.
Ron Morrison, P.E. - Kimley-Horn and Associates, Inc.
File J-378, 379 (a:denfema)
17103 Preston Road · Suite 100 · LB 118 · Dallas, Texas 75248 · Phone 214/2484900