HomeMy Public PortalAbout1997 Engineering Services re Long-Term Beach Renourishment PlanCOASTAL
SYSTEMS
INTERNATIONAL
COASTAL SYSTEMS INTERNATIONAL, INC.
464 South Dixie Highway • Coral Gables, Florida 33146
Tel: 305/661-3655 • Fax: 305/661-1914
Mr. C. Samuel Kissinger
Village Manager
VILLAGE OF KEY BISCAYNE
85 West McIntyre Street
Key Biscayne, Florida 33149
February 11, 1997
135010 -RI
RE: ENGINEERING SERVICES RELATIVE TO THE VILLAGE OF KEY BISCAYNE LONG-TERM
BEACH RENOURISHMENT PLAN , DADE COUNTY, FLORIDA
Dear Mr. Kissinger:
This is to submit the proposal for coastal engineering services relative to the Village of Key
Biscayne Long-term Beach Renourishment Plan. This engineering service is to develop a Long-
term Beach Renourishment Plan that would outline the Village's needs for future beach
renourishments and identify the procedures required to secure necessary permits, fundings and
commitment of offshore sand sources from the regulatory agencies. The following are the
proposed terms of agreement for engineering services to be provided by Coastal Systems
International, Inc. (Coastal Systems) for the Village of Key Biscayne (Village):
PART I - COASTAL ENGINEERING EVALUATIONS
The following coastal engineering evaluations will be conducted to determine the Village beach
performance subsequent to the 1987 beach nourishment project, understand the littoral processes
within the project region, and develop a conceptual beach design plan. The specific components
of this engineering evaluation are described in the following:
a) Data Accumulation: Coastal Systems will collect and review available data relating to
shoreline changes along the island of Key Biscayne (Key Biscayne). Reports prepared by
the US Army Corps of Engineers (COE) and other studies describing the history and
performance of beach nourishment projects within the project area will be reviewed. All
available hydrographic survey data will also be compiled within Coastal Systems'
computer database, in the format of range and elevation for each beach profile, to
facilitate volumetric change comparisons along the project shoreline and vicinity. The
compiled hydrographic survey database will later be transferred to the Village for their
own use.
b) Shoreline/Volumetric Changes and Regional Sediment Budget: Coastal Systems will
calculate the historical shoreline and volumetric changes within Key Biscayne using
available hydrographic surveys. In addition, these available hydrographic surveys will be
Coastal, Environmental, Civil, Engineering and Management
135010
Mr. C. Samuel Kissinger
February 11, 1997
Page 2
compared to the original project design as outlined in the COE's General Design
Memorandum and as built during the 1987 beach nourishment project. The performance
of the beach nourishment project constructed within Key Biscayne will be evaluated. The
historical rate of erosion or accretion along the Key Biscayne beach will be assessed.
This evaluation of historical shoreline and volumetric changes may be utilized to identify
"hot spots" along the project shoreline, where exceptional erosion rates are noted. In
addition, these evaluations will assist in understanding littoral processes within the
project area and in developing the conceptual beach design plan.
A sediment budget will be developed for the region, describing sand movement within
specific segments including Crandon Park, the Village of Key Biscayne, and Bill Baggs
State Park. The net longshore sediment transport rate within the active littoral system,
extending offshore to the depth of closure, within each of the established segments will
be confirmed.
c) Conceptual Beach Design: Coastal Systems will review the design plan developed in
1987 by the U.S. Army Corps of Engineers. Coastal Systems will develop a conceptual
beach design for renourishing the entire beach along the Village based on the historic
erosion rate within the area. This beach design plan will identify the extent of beach fill
along the Village shoreline and design beach cross section with specified berm elevation
and beach slope. The development of the conceptual plan will also take into
consideration of the extent of the nearshore seagrasses, which will be delineated by
DERM. Coastal Systems will calculate the quantity of sands required for the beach
renourishment project and identify the frequency of the beach renourishment project
within a 50 year time frame. The costs associated with implementation of the plan using
various sand sources will be calculated.
PART II - SAND SOURCE ASSESSMENT
Coastal Systems will coordinate with DERM and COE to evaluate the available sources of sand
fill suitable for the beach renourishment. Coastal Systems will review available geotechnical
data towards assessing the quality and compatibility of these various beach fill materials. The
expected performance and estimated cost of the various sand fill materials will be compared.
The sand fill materials to be considered include offshore borrow sites, upland sources and Turks
and Caicos sand. The methods of construction and associated costs of using various sand fill
materials will be analyzed.
COASTAL SYSTEMS INTERNATIONAL, INC. • Coastal, Environmental, Civil Engineering and Management
135010
Mr. C. Samuel Kissinger
February 11, 1997
Page 3
PART III - FUNDING PROCESSES
Coastal Systems will explore the funding availability from the U.S. Army Corps of Engineers,
the State of Florida and Dade County for implementation of this long-term beach renourishment
project. Based on the above identified plan, Coastal Systems will coordinate with DERM (Dade
County) to explore the feasibility of Federal participation for the project under the provisions of
Section 103. Coastal Systems will also evaluate the present state funding status and coordinate
with DERM to include this project in the Dade County funding application to the State. The
processes and time required for obtaining the Federal, State and/or County fundings will be
presented. The deadlines for funding applications for various regulatory agencies will be
identified and incorporated into the Beach Renourishment Plan schedule. The amount of funding
available from various agencies will also be presented.
PART IV - LONG-TERM BEACH RENOURISHMENT PLAN
A preliminary Beach Renourishment Plan report will be prepared summarizing the findings and
making recommendations for the optimum design of beach renourishment along the Village of
Key Biscayne. This Beach Renourishment Plan will be submitted to the Federal, State and
County to express the Village's needs for beach renourishment project and request the Federal
acceptable offshore sand sources and funding support. Specifically, this report will include
detailed descriptions of coastal processes, sand source and funding evaluations and beach
renourishment plan. Potential sand sources will be identified and available funding sources at
Federal, State and local levels will be explored. A Long-term Beach Renourishment Plan will be
developed, outlining quantity of sands needed for the Village over a 50 -year time span as well as
identifying the most cost effective sand source to meet the needs. An immediate 5 -year detailed
plan will also be included in the report. This plan will specify the details of the plan elements
and sequential occurrence of each plan element towards implementing the first beach
renourishment project within 5 years. Coastal Systems will review and comment on existing
beach maintenance practices adopted along Key Biscayne and the Dade County area. Upon
completion of this plan, Coastal Systems will make a presentation to the Village Council
regarding engineering findings and the Long-term Beach Renourishment Plan.
PART V - CLIENT DIRECTED MEETINGS
The phase of services provides for all meetings with the Village, DERM and regulatory agencies
outside of this scope of work. Specifically, Coastal Systems will attend meetings with the
Village, DERM, and/or other regulatory agencies, as required by the Village, to initiate
permitting and funding processes.
COASTAL SYSTEMS INTERNATIONAL, INC. • Coastal, Environmental, Civil Engineering and Management
135010
Mr. C. Samuel Kissinger
February 11, 1997
Page 4
GENERAL
Schedule: Coastal Systems will complete the above referenced services within 15 weeks
subsequent to the authorization to proceed.
Fees: Coastal Systems will invoice the Village for Parts I through IV services on a percentage
complete basis for the fees identified herein. Fees for Part V services will be invoiced on an
hourly basis pursuant to the Rate Schedule identified in our current agreement with Dade County.
Expenses, report preparation and costs relative to travel and accommodations will be invoiced
separately pursuant to the above -mentioned Rate Schedule.
Invoices will be submitted by the 15th of each month for the previous month's work. Invoices
are to be paid within 30 days of receipt of the invoice by the Village. Invoices not paid after 30
days and not in dispute will incur interest at a rate of 1.5 percent per month.
We look forward to working with you towards developing a successful Long-term Beach
Renourishment Plan for the Village of Key Biscayne. Please return a signed copy of this
agreement to us which will serve as our Authorization to Proceed. Should you have any questions
or require any additional information, please do not hesitate to contact me.
Sincerely,
COAS AL SYSTEMS INTERNATIONAL, INC.
SIGNED:
.-P. in, h.D., P.E.
Associate
Mr. Samuel ringer, Village Manager
Village of • Biscayne
DATE: ��
RESOLUTION 96-36, NOVEMBER 14, 1996, AUTHORIZED CONTRACT EXECUTION
PL:ba:jrc
Attachment
cc: James Decocq, Village of Key Biscayne
R. Harvey Sasso, P.E., Coastal Systems
F \PROJECT\135010\COASTAL\S (97-02-11) PRO Samuel Kissinger RI doc
COASTAL SYSTEMS INTERNATIONAL, INC. • Coastal, Environmental, Civil Engineering and Management