HomeMy WebLinkAboutCUP 02-01; OLIVENHAIN MUNICIPAL WATER DISTRICT; FEDERAL EMERGENCY MANAGEMENT ACT; 2008-10-24a..
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
The Honorable Claude A. "Bud" Lewis
Mayor, City of Carlsbad
1200 Carlsbad Village Drive
Carlsbad, CA 92008
Dear Mayor Lewis:.
IN REPLY REFER TO:
Case No.: 08-09-1073R
Community: City of Carlsbad, CA
Community No.: 060285,
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This responds to a requést.that the Department of Homeland Security's Federal Emergency Management
Agency (FEMA) comment on the effects that a proposed project would have on the effective Flood
Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for San Diego County, California
and Incorporated Areai (the effective FIRM and FIS report for your community), in accordance with Part
65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated May 1, 2008,
Ms. Cindy Pecile, Olivenhain Municipal Water District (OMWD), requested that FEMA evaluate the
effects that proposed construction of OMWD Building J, placement of fill, revised hydrologic and
hydraulic analyses, and updated topographic information along Encinitas Creek and Unnamed Tributary
to Encinitas Creek would, have on the flood hazard information shown on the effective FIRM and FIS
report. The proposed area lof revision along Encinitas Creek will extendfrom approximately 1,500 feet
downstream to approximately 250 feet upstream of Rancho Santa Fe Road. The proposed area of revision
along Unnamed Tributary to Enciiitas Creek will extend from the confluence with Encinitas Creek
(confluence) to approximately 900 feet upstream of Rancho Santa Fe Road.
All data required to complete our review of this request for a Conditional Letter of Map Revision
(CLOMR) were submitted with letters from Mr. Randall J. Hartman, P.E., CH2M Hill, and Ms. Pecile.
We reviewed the submitted data and the data used to prepare the effective FIRM for your community and
determined that the proposed project meets the minimum floodplain management criteria of the NFIP..
The submitted existing conditions H.EC-RAS hydraulic computer model, dated July 11, 2008, 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 submitted plan entitled "Olivenhain Municipal Water District Phase One Building J," prepared
by CH2M Hill, dated January 31, 2008, and the data listed belowr are received, the floodplai'n boundaries
of the base (1-percent-annual-chance) flood will be delineated as shown on the topographic work map
entitled "Post-Development Condition Floodplain Workmap," jirepared by CH2M Hill, dated June 22,
2007, and .a revision to the FIRM would be warranted.
Encinitas Creek
On the effective FIRM, the proposed area of revision along Encinitas Creek was not studied. As a result
of the existing conditions analysis, this area will be designated as Zone A, a Special Flood Hazard Area
(SFHA), an area that would be inundated by the base flood, with no Base Flood Elevations determined.
As a result of the proposed project, the base flood water-surface elevations (WSELs) will increase and
decrease throughout the proposed area of revision compared to the existing conditions base flood WSELs
for Encinitas Creek. The maximum increase in base flood WSEL, 0.2 foot, will occur just downstream of
Rancho Santa Fe Road. The maximum decrease in base flood WSEL, 0.1 foot, will occur just upstream
of Rancho Santa Fe Road.
As a result of the proposed project, a new SFHA will be established throughout the proposed area of
revision along Encinitas Creek, with a maximum width of approximately 750 feet at approximately 500
feet downstream of Rancho Santa Fe Road.
Unnamed Tributary to Encinitas Creek
On the effective FIRM, a portion of the proposed area of revision along Unnamed Tributary to Encinitas
Creek is not studied from the confluence to approximately 650 feet upstream, and a portion is shown as
an SFHA designated Zone A from approximately 650 feet upstream to approximately 900 feet upstream
of the confluence. As a result of the existing conditions analysis, the entire revision area along Unnamed
Tributary to Encinitas Creek was designated as Zone A.
As a result of the proposed project, the base flood WSELs will increase and decrease throughout the
proposed area of revision compared to the existing conditions base flood WSELs for Encinitas Creek.
The maximum increase in base flood WSEL, 0.7 foot, will occur approximately 400 feet upstream of
Rancho Santa Fe Road. The maximum decrease in base flood WSEL, 0.1 foot, will occur approximately
250 feet upstream of Rancho Santa Fe Road.
As a result of the proposed project, the width of the SFHA will increase in some areas and decrease in
other areas from approximately 650 feet upstream to approximately 900 feet upstream of the confluence
compared to the effective SFHA width along Unnamed Tributary to Encinitas Creek. The maximum
increase in SFHA width, approximately 50 feet, will occur approximately 700 feet upstream of Rancho
Santa Fe Road. The maximum decrease in SFHA width, approximately 150 feet, will occur
approximately 650 feet upstream of Rancho Santa Fe Road. In addition, a new SFHA will be established
from the confluence to approximately 650 feet upstream, with a maximum width of approximately 600
feet just upstream of the confluence.
Upon completion of the project, your community may submit the data listed below and request that we
make a final determination on revising the effective FIRM and FIS report.
Detailed application and certification forms, which were used in processing this request, must be
used for requesting final revisions to the maps. Therefore, when the map revision request for the
area covered by this letter is submitted, Form 1, entitled "Overview & Concurrence Form," must
be included. (A copy of this form is enclosed.)
The detailed application and certification form listed below may be required if as-built conditions
differ from the preliminary plans. If required, please submit a new form (copy enclosed) or
annotated copies of the previously submitted form showing the revised information.
Form 2, entitled "Riverine Hydrology & Hydraulics Form"
Hydraulic analyses, for as-built conditions, of the base flood, together with a topographic work
map showing the revised floodplain boundaries, must be submitted with Form 2.
Effective October 1, 2007, FEMA revised the fee schedule for reviewing and processing requests
for conditional and final modifications to published flood information and maps. In accordance
with this schedule, the current fee for this map revision request is $4,800 and must be received
before we can begin processing the request. Please note, however, that the fee schedule is subject
to change, and requesters are required to submit the fee in effect at the time of the submittal.
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 Insurance Program, or by credit card (Visa or MasterCard only). The
payment, along with the revision application, must be forwarded to the following address:
FEMA National Service Provider
3601 Eisenhower Avenue
Alexandria, VA 22304-6425
As-built plans, certified by a registered professional engineer, of all proposed project elements
Community acknowledgment of the map revision request
Documentation of the individual legal notices that were sent to property owners who will be
affected by the increases in SFHA width along Encinitas Creek and Unnamed Tributary to
Encinitas Creek
After receiving appropriate documentation to show that the project has been completed, FEMA will
initiate a revision to the FIRM and FIS report.
This CLOMR is based on minimum floodplain management criteria established under the NFIP. Your
community is responsible for approving all floodplain development and for ensuring all necessary permits
required by Federal or State law have been received. State, county, and community officials, 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 community has adopted more restrictive or comprehensive floodplain
management criteria, these criteria take precedence over the minimum NFIP 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 community. Information
on
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the CCO for your community may be obtained by calling the Director, Mitigation Division of FEMA in
Oakland, California, at (510) 627-7175. If you have any questions regarding this CLOMR, please call
our Map Assistance Center, toll free, at 1-877-FEMA MAP (1-877-336-2627).
Sincerely,
, J. 7(:~/
Craig S. Kennedy, CFM, Program Specialist
Engineering Management Branch
Mitigation Directorate
Enclosures
cc: Mr. Clyde Wickham
Associate City Engineer
City of Carlsbad
Ms. Cindy Pecile
Olivenhain Municipal Water District
Mr. Randall J. Hartman, P.E.
CH2M Hill
For: William R. Blanton Jr., CFM, Chief
Engineering Management Branch
Mitigation Directorate