LTC 013-2019 Miami-Dade County Beach Renourishment Update & U.S. Army Corps Projects Update MIAMI BEACH
OFFICE OF THE CITY MANAGER
NO. LTC# 013-2019 LETTER TO COMMISSION
TO: Mayor Dan Gelber and Members • the Ci (ommission
FROM: Jimmy L. Morales, City Manage
I .��
DATE: January 9, 2019
SUBJECT: Miami-Dade County Beach Renourishment Update & U.S. Army Corps Projects
Update
The purpose of this LTC is to provide an update to the Mayor and City Commission on
various beach restoration efforts including Miami-Dade County's emergency truck haul
beach renourishment project and sand tilling in the vicinity of 58th Street. In addition,the LTC
provides an update on the recently funded U.S.Army Corps projects including: Miami-Dade
County Beach Construction Project, Miami-Dade County Beach Renourishment Feasibility
Study, and the Miami-Dade County Back Bay Study.
Emergency Beach Renourishment Project
I am pleased to announce the completion of Miami-Dade County's emergency beach
renourishment project that addressed the erosional hotspots in the vicinity of 63`d to 68th
Street. Last year along this segment, natural erosion was accelerated by storm surge from
Hurricane Irma and the winter storms. After the storms, Miami-Dade County conducted a
survey countywide and identified this segment of beach as the most highly eroded section
and identified $1.5 million for renourishment. Construction began in July 2018 and was
completed November 30, 2018. The County placed approximately 37,700 cubic yards of
sand from Ortona in Central Florida.
58th Street Restoration Project
In 2015, the Chateau Ocean located at 9365 Collins Avenue was required per their Florida
Department of Environmental Protection(FDEP)Coastal Construction Control Line Permit to
relocate approximately 20,900 cubic yards of sand from approximately 53rd Street to 58th
Street.After the material was placed, construction debris including small fragments of glass,
tile and concrete were found at the northern section of the placement area.
On March 11, 2016, FDEP executed a Consent Order that required Chateau Ocean to
remove the fill material placed in the north section and replace it with beach compatible sand
fill from an upland source. In April 2016, the Chateau Ocean completed the remediation of
the sand placed in 2015.The Chateau Ocean conducted additional sifting and replaced the
originally placed material with sand from SDI Sand Mine in Miami-Dade County.
It should be noted that this was the first project that used sand from the SDI Sand Mine.
After the material was placed, the fine particles in the sand began to compact. Since 2016,
the City has been working with Miami-Dade County to find a remedy for the compaction
issue and has not permitted the use of sand from locations other than the sand mines from
Central Florida that have historically had the most compatible beach fill.
LTC—Beach Restoration & USACE Updates
January 9, 2019
Page 2 of 2
In April 2018, Miami-Dade County initiated a pilot project to blend the SDI sand with original
base sand underneath the placed material. Miami-Dade monitored this tilled area and
following positive compaction tests six months later expanded the tilling 800 feet south of the
pilot area. Final tilling was completed on December 21 addressing the entire area where SDI
sand had been placed.
I am pleased to report the restoration of this section of beach has been completed. However,
the City's Environment& Sustainability Department will continue to work with Miami-Dade
County to monitor the success of the tilled area over the upcoming months to ensure that the
compaction issue has been fully remediated.
Update on U.S. Army Corps of Engineers Projects
In 2018, Congress approved the Federal Supplemental Bill that included three major
projects impacting Miami-Beach: the Miami-Dade County Beach Erosion Control and
Hurricane Protection Project; the Miami-Dade County Beach Renourishment Feasibility
Study; the Miami-Dade Back Bay Coastal Storm Risk Management Feasibility Study.
Attached is a brief overview of these three projects provided by the U.S. Army Corps of
Engineers (USACE).
Through the Greater Miami & the Beaches 100 Resilient Cities partnership, Miami-Dade
County, City of Miami and City of Miami Beach have prioritized these three projects in the
Resilient 305 Strategy that will be released in 2019.Through the Resilient 305 Strategy, the
County and municipal partners are working together to bring funding and collaborating to
plan large scale projects to help reduce our community's risk to sea level rise.
The Miami-Dade County Beach Erosion Control and Hurricane Protection Project provides
$158 million to implement renourishment and other related beach construction activities
along the existing 50-year Miami-Dade County Federally Authorized Project over the next
five years. In March 2019, the USACE anticipates awarding the contract for a truck haul
renourishment in Surfside. This phase will bring 300 cubic yards of material to 96th Street to
88th Street. The next section to be addressed will be the erosional hot spot locations in
Miami Beach. The USACE estimates that award of this contract will be in June 2018. This
phase will bring approximately 200 cubic yards to the segments most in need of sand. Once
the final sections are determined and we have more specific information about the
construction timeline, this information will be provide to the Mayor and City Commission. In
early 2020, the USACE will begin the final two segments in this project in Bal Harbour and
Sunny Isles.
The existing federally authorized Beach Erosion Control and Hurricane Protection Project is
set to expire in 2025. The USACE is undertaking the Miami-Dade County Feasibility Study in
preparation for the re-authorization of the existing project. This study will include updating
the economic analysis for the project, project location and construction methods, and
potential sand sources. This $2 million study is estimated to take two years to complete.
The Miami-Dade Back Bay Coastal Storm Risk Management Feasibility Study is a$3 million
study that will be conducted over the next three years. The study will investigate solutions
that will reduce damages and risks from impacts of sea level rise and coastal storms. The
study will focus on critical infrastructure and areas most vulnerable to storm surge flooding.
SMT/ESW
Project Overview
ro,adco•nN Current Status
Wean Dade CO alk"% "': Approximately 2,000,000 cubic yards(cy)of sand Is needed to AMOUNT FEDERALLY FUNDED STATUS PROJECTION
i restore the Dade County Beach Erosion Control and Hurricane Dade County Construction 100%federally P&S ongoing,construction
Protection Project. $158.3 M Multiple phases
pp funded pending execution of PPA
• WNW'rSlE1� Dade CountyFeasibility100%federal)
oject Details v
e $2 M Oct 9,2018 FCSA executed 3 ye to complete
MA ""BEA4KPARRil ° • 13 miles from Government Cut to Sunny Isles Study funded
o • Authorized:1968,and 1986
gm.NARBot.. z Miami Back BayStudy100%federally 3 yrs to complete
SURFSIDE • Initial Construction:1975,1988 $3 M funded Oct 9,2018 FCSA executed
Si'
•
< Short-Term Project Initiatives
0
.r AMI sru • Fully restore the Dade County project within 3 years by August of 2021,
usinga varietyof sediment sources(truck haul,local inlets,and CONSTRUCTION
4 H SUPPLEMENTAL TRACKS VOLUME(cy) ADVERTISE AWARD COMPLETE
�srtrrP -• c offshore borrow sources).
Truck Haul Surfside 300K Dec 2018 March 2019 July 2019
6
{ Long-Term Project Initiatives Truck Haul Hotspots
.i $ TBD March 2019 June 2019 October 2019
(27,44 55,63)
• Development of DELFT 3D Hydrodynamic and Sediment transport
KEY EISNE model,calibrated with sediment tracers and In-field measurements to Bal Harbour 250K Nov 2019 January 2020 August 2020
forecast and analyze different structural/non-structural measures to
prolong nourishment intervals and Increase overall Coastal Resiliency. Sunny Isles and Miami Bch -1.5M June 2020 July 2020 August 2021
Projections for Beach Placement
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MIAMI-DADE COUNTY - • MIAMI-DADE COUNTY
For Additional Information,Contact:Laurel Relchold,Project Manager 1 Laurel.P.Relcholdlusace.army.mii kg U.S.ARMY CORPS OF ENGINEERS