HFLP-CS101008 NATIONAL FLOOD INSURANCE PROGRAM
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October 8, 2010
Mr. Glen A. Dixon, P.E., CFM IN REPLY REFER TO:
Cotter Associates, LLC Case No.: 10- 06 -3452R
1805 W. Park Row Drive, Suite C Communities: Cities of Carrollton, Coppell, and
Arlington, TX 76013 Dallas, TX
Community Nos.: 480167, 480170, and 480171
316 -AD
Dear Mr. Dixon:
This responds to your request dated September 2, 2010, that the Department of Homeland Security's Federal
Emergency Management Agency (FEMA) issue a conditional revision to the Flood Insurance Rate Map
(FIRM) for Dallas County, Texas, and Incorporated Areas. Pertinent information about the request is listed
below.
Identifier: CLOMR- Located on the Elm Fork of the Trinity
River at River Station 867 +93
Flooding Source: Elm Fork of Trinity River
FIRM Panels Affected: 48113C0155 J and 48113C0160 J
The data required to complete our review, which must be submitted within 90 days of the date of this letter,
are listed on the enclosed summary.
If we do not receive the required data within 90 days, we will suspend our processing of your request.
Any data submitted after 90 days will be treated as an original submittal and will be subject to all
submittal/payment procedures, including the flat review and processing fee for requests of this type
established by the current fee schedule. A copy of the notice summarizing the current fee schedule, which was
published in the Federal Register, is enclosed for your information.
FEMA receives a very large volume of requests and cannot maintain inactive requests for an indefinite period
of time. Therefore, we are unable to grant extensions for the submission of required data/fees for revision
requests. If a requester is informed by letter that additional data are required to complete our review of a
request, the data /fees must be submitted within 90 days of the date of the letter. Any fees already paid will be
forfeited if the requested data are not received within 90 days.
LOMC Clearinghouse, 7390 Coca Cola Drive, Suite 204, Hanover, MD 21076 / PH: 1- 877 -FEMA MAP / FX: 1 -800- 358 -9620
The Risk Assessment, Mapping, and Planning Partners, under contract with the Federal Emergency Management
Agency, are a Production and Technical Services provider for the National Flood Insurance Program
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If you have general questions about your request, FEMA policy, or the National Flood Insurance Program,
please contact the FEMA Map Information eXchange (FMIX), toll free, at 1- 877 -FEMA MAP
(1- 877 - 336 - 2627). If you have specific questions concerning your request, please contact your case reviewer,
Mr. Aswartha Balla, by e-mail at aswartha_balla @urscorp.com or by telephone at (301) 670 -3361, or the
Revisions Coordinator for your State, Mr. Naresh Balija, P.E., CFM, at naresh_balija @urscorp.com or at
(301) 258 -5954.
Sincerely,
Jonica Gibson, P.E., CFM
LOMC Manager
Risk Assessment, Mapping,
and Planning Partners
Enclosures
Summary of Additional Data
Fee Schedule
cc: Mr. Kenneth M. Griffin, P.E.
Floodplain Administrator, City of Coppell
Mr. Steve Parker, P.E., CFM
Floodplain Administrator, City of Dallas
Mr. Cesar Molina
Director of Engineering, City of Carrollton
Case No.: 10- 06 -3452R 316 -AD
October 8, 2010
O
`° NATIONAL FLOOD INSURANCE PROGRAM
4 FEMA PRODUCTION AND TECHNICAL SERVICES CONTRACTOR
AND 0
Summary of Additional Data Required to Support a
Conditional Letter of Map Revision (CLOMR)
Case No.: 10- 06 -3452R Requester: Mr. Glen A. Dixon, P.E., CFM
Communities: Cities of Carrollton, Coppell, and Community Nos.: 480167, 480170, and 480171
Dallas, TX
The issues listed below must be addressed before we can continue the review of your request.
1. Our review revealed that, along with the City of Coppell, the Cities of Carrollton and Dallas are also
affected by this revision. Please provide a letter of community acknowledgment stating that the Cities of
Carrollton and Dallas have reviewed the revision request, understand the effects of the revision on
flooding conditions in their communities, and determined that any land and any existing or proposed
structures to be removed from the Special Flood Hazard Area, the area that would be inundated by the
base (1- percent - annual- chance) flood, are or will be reasonably safe from flooding, or provide a
completed Application/Certification Form 1, entitled "Overview and Concurrence Form," signed by
officials from the Cities of Carrollton and Dallas. Alternatively, if the revision area has been annexed by
the City of Coppell, please provide copies of the annexation agreement and a current corporate limits
map.
2. Our review revealed that a floodway analysis was not performed for the duplicate effective, existing and
proposed conditions models. Please revise the duplicate effective, existing and proposed conditions HEC-
RAS models to include an analysis of the regulatory floodway. Please provide paper and digital copies of
the input and output files for these models. Please also ensure that the surcharges do not exceed the 1-
foot maximum allowed.
3. The submitted topographic work map entitled, "Proposed Conditions Floodplain Workmap," prepared by
Cotter Associates, LLC, and dated August 2010, does not provide essential information required to
enable us to complete our review of this request. Please submit a revised topographic work map, certified
by a registered Professional Engineer, that shows all applicable items listed in Section C of
Application/Certification Form 2, entitled "Riverine Hydrology and Hydraulics Form," including:
a. Continuous boundary delineations of the proposed conditions base (1- percent - annual- chance)
floodplain, 0.2- percent - annual- chance floodplain, and regulatory floodway
b. Continuous boundary delineations of the currently effective base floodplain, 0.2- percent - annual-
chance floodplain, and regulatory floodway
c. Logical tie -ins between the revised and effective flood hazard boundary delineations
d. Topographic contour information used for the boundary delineations of the base floodplain and
0.2- percent - annual- chance floodplain, with legible contour labels for the entire revision area
e. Extend Cross - Sections to be shown throughout the effective floodplain
LOMC Clearinghouse, 7390 Coca Cola Drive, Suite 204, Hanover, MD 21076 / PH: 1- 877 -FEMA MAP / FX: 1- 800 - 358 -9620
The Risk Assessment, Mapping, and Planning Partners, under contract with the Federal Emergency Management
Agency, are a Production and Technical Services provider for the National Flood Insurance Program
Page 2 of 2
4. Please submit the annotated Flood Insurance Rate Maps (FIRMs), at the scale of the effective FIRMs
48113C0155 J and 48113C0160 J, that show the revised boundary delineations of the base floodplain,
0.2- percent - annual- chance floodplain, and regulatory floodway shown on the submitted work map and
how they tie into the boundary delineations shown on the effective FIRM at the downstream and
upstream ends of the revised reach.
Effective January 13, 2010, the Federal Emergency Management Agency revised the fee schedule for
reviewing and processing requests for conditional and final modifications to published flood information and
maps. A copy of the notice summarizing the current fee schedule, which was published in the Federal
Register, is enclosed for your information. In accordance with this schedule, the fee for your request is $4,400,
which must be submitted before we can continue processing your request. Payment of this fee must be made in
the form of a check, money order, or credit card payment (Visa or MasterCard only), payable in U.S. funds to
the National Flood Insurance Program. For identification purposes, the case number referenced above must be
included on the check or money order. We will not perform a detailed technical review of your request until we
receive this payment.
Please send the required data/fees to:
FEMA LOMC Clearinghouse
7390 Coca Cola Drive, Suite 204
Hanover, MD 21076
For identification purposes, please include the case number referenced above on all correspondence.
Case No.: 10- 06 -3452R 316 -AD
October 8, 2010