FS9905-CS 990712Federal Emergency Management Agency
Washington, D.C. 20472
JUL 12 1999
CERTIFIED MAIL
RETURN RECF. H~T REQUESTED
IN REPLY REFER TO:
Case No.: 99-06-1535R
The Honorable Candy Sheehan
Mayor, City of Coppell
255 Parkway Boulevard
Coppell, TX 75019
Community: City of Coppell, Texas
Community No.: 480170
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Dear Mayor Sheehan:
This responds to a request that the Federal Emergency IVhnngement Agency (FEMA) comment on the
effects that a proposed project would have on the effective Rood Ins~ Rate Map (FIRM) for your
community in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In
a letter dated June 23, 1999, Mr. Ronald W. Morrison, P.E., C.F.M., Morrison Hydrology
Engineering, Inc., requested that FEMA evaluate the effects that proposed piacement of fill along Elm Fork
of Trinity River (Elm Fork) and proposed excavation associated with proposed constniction of the River
Chase Elementary Schcol would have on the flood hazard information shown on the effective FIRM and
Flood Insurance Study CFIS) report. The proposed fill will be placed appwximately 2,300 feet south of
Sandy Lake Road and approximately 800 feet east of Macarthur Boulevard, and the proposed excavation
will occur approximately 1,800 feet south of Sandy Lake Road and from approximately 300 feet east to
approximately 700 feet east of Macarthur Boulevard.
All data required to complete our review of this request for a Conditional Letter of Map Revision
(CLOIV!R) were submitted with letters from Mr. Morrison.
We have completed our review of the submiued data, the flood data used m prepare the effective FIRM,
and data submiRed to reflect existing conditions in support of a CLOMR dated June 7, 1999, for your
community. The submitted existing conditions HEC-2 hydraulic computer model, dated April 24, 1999,
based on updated topographic information, was used as the base conditions model in our review of the
proposed conditions model for this CLOMR request. We believe that, if the proposed project is
constructed as shown on the topographic work map entitled "River Chase Elementary School, Proposed
100 year Floodplain," contained in the report entitled "Flood Study in support of a Conditional Letter of
Map Revision for River Chase Elementary School, City of Coppell, Texas," prepared by Morrison
Hydrology Engineering, Inc., dated June 15, 1999, and the data listed below are received, a revision to
the FIRM would be warranted.
As a result of the more detailed topographic information, the elevations of the flood having a 1-percent
chance of being equaled and exceeded in any given year (base flood) and the width of the Special Flood
Hazard Area (SFtIA), the area that would be inundated by the base flood, along Elm Fork decreased in
the vicinity of the proposed project compared to the effective base flood elevations (EFEs) and SFHA
width.
Because the proposed placemere of fill and excavation along Elm Fork will occur largely within the
floodplain of the flood having a 0.2-porcent chance of being equaled or exceeded in any given year, the
proposed project will not affect the existing conditions BFEs. The widths of the SFHA and the regulatory
floodway along Elm Fork will not change as a result of the proposed project.
Upon completion of the project, your community may submit the d=t~ listed below and request that we
make a final determination on revising the effective FIg report and FIRM.
Effective March 1, 1999, FEMA revised the fee schedule for reviewing anti processing
requests for conditional and final modifications to published flood information and maps.
In accordance with this schedule, th~ fee for your rnnp revision request will be $3,400 and
must be received before we can begin processing your request. Payment of this fee shall
be made in the form of a check or money order, made payable in U.S. funds to the
National Flood ln,~rance Program, or by credit card. The payment must be forwarded
to the following address:
Federal Emergency Management Agency
Fee-Collection System Administrator
P.O. Box 3173
Merri~eld, VA 22116-3173
As-bulk plans, certified by a registered professional engineer, of all proposed pwject
elements
· Community acknowledgment of the map revision request
Certification that all fill placed in the currently effective base floodplain and below the
proposed BFE is compacted to 95 percent of the maximum density obtainable with the
Standard Proctor Test method issued by the American Society for Testing and Materials
(ASTM Standard D-698) or an acceptable equivalent mathod for all areas to be removed
from the base floodplain
This CLOMR is based on minimum ~oodphin management criteria established under the NFIP. Your
community is responsible for approvin~ all floodplain development, and for ensuring all ~ pennits
required by Federal or State law have been received. State, county, and community o~icla|~ based on
knowledge of local conditions and in the interest of safety, may set higher standards for construction in the
SFHA. If the State, county, or conunity has adopted more restrictive or comprehensive floodplain
management criteria, these criteria take precedence over the minimum NPIF criteria.
If you have any questions regarding floodplain management regulations for your community or the NFIP
in general, please contact the Consultation Coordination Officer (CCO) for your commu.nity. Information
on the CCO for your community may be obtained by contacting the Director, Mitigation Division of
FEMA in Denton, Texas, at (940) 898-5127. If you have any technical questions regarding this CLOMR,
3
please contact Mr. Alan Johnson of our staff in Washington, DC, either by telephone at (202) 64(>-3403
or by facsimile at (202) 6464596.
Sincerely,
Alan A. Johnson, P.E., Project Engineer
Hazards Study Branch ~
Mitigation Directorate
Enclosure(s)
CC:
Mr. Kenneth M. Griffin, P.E.
Director of Engineering and Public Works
City of Coppert
Matthew B. Miller, P.E., Chief
H, 7~rds Study Branch
Mitigation Directorate