HomeMy Public PortalAbout2012-06 Approving the proposal by Coastal Systems International to Upland Beach Sand Source TestingRESOLUTION NO. 2012-6
A RESOLUTION OF THE VILLAGE COUNCIL OF THE
VILLAGE OF KEY BISCAYNE, FLORIDA, APPROVING
THE PROPOSAL BY COASTAL SYSTEMS
INTERNATIONAL, INC. ATTACHED AS EXHIBIT "A"
RELATING TO UPLAND BEACH SAND SOURCE TESTING
FOR THE BEACH RENOURISHMENT PROJECT;
AUTHORIZING THE VILLAGE MANAGER TO EXECUTE
A WORK ORDER CONSISTENT WITH THE TERMS OF
THE PROPOSAL; PROVIDING FOR IMPLEMENTATION;
AND PROVIDING FOR AN EFFECTIVE DATE.
WHEREAS, pursuant to a contractual agreement previously entered into between the Village
of Key Biscayne (the "Village") and Coastal Systems International, Inc. (the "Engineer"), the
Engineer has been retained by the Village in connection with services needed for the Village of Key
Biscayne Beach Renourishment Projects; and
WHEREAS, the Engineer, pursuant to its continuing contract, has submitted the proposal
attached as Exhibit "A," proposed to perform certain sand source testing (geologic) and reporting
by Scientific Environmental Applications, Inc. (SEA) for alternate sources of beach compatible sand
for the beach renourishment project available from planned excavations (the "Proposal"); and
WHEREAS, the Village Council desires to authorize the Village Manager to execute a work
authorization consistent with the Proposal; and
WHEREAS, the Village Council finds that this Resolution is in the best interest and welfare
of the residents of the Village.
NOW, THEREFORE, BE IT RESOLVED BY THE VILLAGE COUNCIL OF THE
VILLAGE OF KEY BISCAYNE, FLORIDA, AS FOLLOWS:
Section 1. Recitals Adopted. Each of the above stated recitals are hereby adopted,
confirmed and incorporated herein.
VILLAGE ATTORNEY
Section 2. Proposal Approved. The Village Council hereby approves the Proposal
attached as Exhibit "A" submitted by the Engineer.
Section 3. Village Manager Authorized. The Village Manager is hereby authorized
to execute a work authorization with the Engineer, consistent with the proposal attached hereto as
Exhibit "A," subject to approval as to form, content, and legal sufficiency by the Village Attorney.
Section 4. Implementation. The Village Manager is hereby authorized to take any and
all necessary action to implement the purposes of this Resolution and the Proposal.
Section 5. Effective Date. This Resolution shall be effective immediately upon
adoption.
PASSED AND ADOPTED this 7th day of February, 20
R FRANKLIN H. CAPLAN
CONCHITA H. ALVAREZ, MMC, VILLAGE CLERK
APPROVED AS TO FORM AND LEGAL SUFFICIENCY:
2
CO A STA:L
SYSTEMS
IATI:I,MArIo:2A1.
COASTAL SYSTEMS INTERNATIONAL, INC.
464 Souch Dixie Highway • Coral Gables, Florida 33146
Tel: 305-661-3655 • Fax: 305-6614914
www.coastalsystemsint.cwm
WORK AUTHORIZATION CONFIRMATION
Date: January 31, 2012
From:
Coastal Systems International, Inc.
Project No.: 135040.02
To:
Mr, John Gilbert
VILLAGE OF KEY BISCAYNE
464 South Dixie Highway 88 West McIntyre Street
Coral Gables, Florida 33146 Key Biscayne, Florida 33149
RE: VILLAGE OF KEY BISCAYNE BEACH MAINTENANCE PROJECT, MIAMI-DADE COUNTY,
FLORIDA
❑ This is to confirm that verbal authorization was given to Coastal Systems International to proceed
according to the terms of our proposal (or part(s) only) to you dated
This is to confirm authorization for Coastal Systems International, Inc. to provide the following
services:
PART 12 —UPLAND SAND SOURCE INVESTIGATION
Coastal Systems will retain Scientific Environmental Applications (SEA) as a subconsultant to
conduct the beach sand compatibility testing and reporting as outlined in the attached scope of
services. The sand to be excavated as part of the Sonesta development will be sampled and tested
in accordance with Florida DEP requirements by a Professional Geologist to evaluate the sand
for use in the Key Biscayne Beach Renourishment Project.
Fees for these additional services are:
® Lump Sum at $20,810.
Expenses will be invoiced in accordance with our approved agreement terms. Please execute and return
one original copy of this work authorization for our files. Should you have any questions regarding this
authorization, please contact me at (305) 669-8650 or tblankenshipna,coastglsysternsint.com.
For: Coastal Systems International, Inc.
Signed:
Timothy K. Blankenship, Director
For: Village of Key Biscayne
Signed:
Date: January 31, 2012 Dat
Filo, TKO, cm, PC, AL, Cannut Bool, Acco npng
F'Wrolect\USIND.D21Propialst(12-0I.1U) PRO °abut - Swim 8uyos..l0c
Coastal, Environme giifieering and Management
.t(G`
Methods Proposed for Sand Source Evaluation of an Inland Project Site in
Key Biscayne, Florida
Scientific Environmental Applications, Inc. (S.E.A.), Melbourne, FL
Introduction
In order to characterize the sand resources within the Key Biscayne project site for beach
compatibility twelve core borings will be extracted and analyzed for stratigraphic and textural
properties. The goal of the analysis is to assemble all information required by the permitting
agencies to allow beach quality sand to be excavated from the project site and placed on the
adjacent beach. Methods and procedures of the analysis are listed below.
Core Borings
The core boring method will consist of a hydraulically operated rotary drill head capable of a
continuous cut through unconsolidated and semi -consolidated sediments. The total length of each
core boring will be approximately 25 feet below the topographic surface. Previous work in the
project area has shown that the Key Largo Limestone is at an approximate elevation of -20 ft
NAVD. The topographic surface of the project site varies between about 0 and +5 ft. NGVD.
Thus, the core boring of 25 feet will penetrate though all of the sandy overburden and at some
points reach into the upper few feet of the limestone. This will assure the ability to characterize
the entire thickness of sandy sediments above the limestone.
During the coring process samples will taken continuously along the core using a split spoon
sampler. The samples will be placed in stratigraphic order in archive boxes for transport to the
laboratory.
Core Logs
The core borings will be visually inspected, and logged in detail according to ASTM D2488, the
standard practice for visual descriptions of the stratigraphic soil layers. Results of the logging
procedure will be coded into the gINTrm software customized for the Florida Department of
Environmental Protection (FDEP) ROSS database. The gINTTm software includes Engineering
Form 1836 commonly used by the U.S. Army Corps of Engineers for core log presentation.
During the logging procedure, particular attention will be paid to lithology, texture, silt and clay
content, shell content, and Munsell color. Samples for grain -size analysis will be taken at
intervals warranted by changes in lithology. A composite sample of each core will also be taken
to represent the interval that corresponds to beach quality sand. Results of the grain -size analysis
procedure described below will be compared with the core logs to insure consistency between
the soil classification listed on the core logs and the classification of individual samples. An
example of a core log from a borrow area offshore of Broward County, FL is shown in Figure 1.
Figure 2 shows the corresponding grin size distribution plot for a sample from core BC09-0I .
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Sample Analysis
Each sample will be split into two sub -samples. One of the two sub -samples will be used to
perform the various analyses and the second sub -sample will be archived. Grain size analysis
will be according to ASTM Standard D-422 for mechanical particle size analysis of the soils.
Analysis will be conducted by mechanical sieving using a set of nested screens that divide
sediments at phi intervals from -4 to +3.5 phi and will include the +3.75 phi (#200 mesh screen)
required by the FOE?. Weight retained on each sieve is used to compute grain -size distribution
in terms of weight percent of sample in each size class. Weights are recorded on a Lab Grain
Size Data Sheet. For bulk fine (silt and clay fraction) and coarse content, the ASTM DI 140
(ASTM, 2008) and the Wentworth (1929) procedures of determining percent fine fraction will be
followed. The percent fine sediment retained on #230 and #200 sieves is also reported on Lab
Grain Size Data Sheet generated from the &NT TM software.
Grain size distribution of samples processed in accordance with the above procedures will be
analyzed using the method of moments and graphic methods as described by Folk (1974). The
software platform used for the calculation in the gINT TM geotechnical software. This software is
guided by a software library developed specifically for the Florida DEP by gINT" . Tabular
summaries of each sample will be generated for sieve size, phi size, and mesh opening size in
millimeters, weight of sediment retained in grams, cumulative percent retained, and cumulative
percent passing. Sample statistics (e.g., mean, standard deviation, skewness, and kurtosis) are
displayed in the summary tables. The sample classification according to the CJSCS is
automatically generated by the gINTIm software. A frequency plot of grain size distribution is
provided for each sample in accordance with USACE Form 2087. Figure 2 is an example of the
grain size frequency plot generated by the gINTI1`'t software. Figure 3 is an example of the
corresponding data table.
A high temperature burn method will be used to determine the carbonate content of each discrete
and composite sample. This method involves igniting a pre -weighed sample at 1080C° for 8
hours. During ignition, the carbonate (calcite) crystal lattice is broken down, carbon dioxide
released, and only the calcium atoms remain. Thus, the weight percent carbonate can be easily
calculated knowing the atomic weights of the atoms that form the calcite lattice.
Final Report
The final report will describes the goals, methods, results and include a series of appendices
listing the core logs and grain size analysis of the discrete and composite samples. An
assessment will be made of the beach quality of the sand source. Interpretation of the results will
include sand volume calculations. Additional products will include the data set presented in the
various database formats required by the FDEP. Among these products are the ACCESS
Database file exported from the gINT Tm software, GIS layers depicting the location of the core
borings and volume of the beach quality sand. Figure 4 is an example of a stratigraphic model
produced from a series of core borings from an upland sand mine located in Indian River
County. From the model developed for the Key Biscayne project site volumes of individual
layers will be calculated, as well as the volume of the entire sand body.
Figure 4. Example of a 3D geologic model generated from geotechnical data collected from core
borings within an upland sand mine in Indian River County, FL.
Project Costs
Table I list the proposed project costs by tasks. The costs are based on a total of ten 25 -foot core
borings. From each core 5 samples will be analyzed including a composite of the beach quality
interval. Unit costs for the analysis are provided along with labor costs from assembling the final
products to complete the final report. The proposed cost for the 10 core borings includes
mobilization costs.
Tablel. Proposed Project Costs
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Ten core borings
(Andaman)
1
$7,200.00
Gary Zarillo,
Supervision
40
$92.00
$3,680.00
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Core Logs in
FDEP format
10
$115.00
$1,150.00
Sample
Processing
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for grain size to FDEP specs.
50
$46.00
$2,300.00
$700.00
Percent Carbonate
samples
testing on discrete and composite
50
$14.00
Percent Organic
samples
testing on discrete and composite
50
$14.00
$700,00
Wet sieving
on discrete and composite samples
50
$14.00
$700.00
Color code according
to Munsell
50
$14.00
$700.00
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Final Report including
and 3D model
all FDEP products
of sand resource
40
$92.00
$3,680.00
Total (S.E.A.,
Inc.)
$20,810.00