Agenda 04/28/2015 Item #16A12 4/28/2015 16.A.12.
EXECUTIVE SUMMARY
Recommendation to accept a proposal from CB&I Coastal Planning & Engineering dated March
10,2015 for Collier Creek Dredging Project Design,Permitting and Bid Assistance,approve a work
order under Contract No. 13-6164-CZ for a not to exceed amount of $68,845.90, authorize the
County Manager or his designee to execute Work Order, authorize necessary budget amendment
and make a finding that this item promotes tourism (Project No.90064).
OBJECTIVE: To accept a proposal from CB&I for Collier Creek Dredging Project Design,
Permitting and Bid Assistance.
CONSIDERATIONS: The Feasibility Study to identify the current issues and potential
solutions at the Collier Creek entrance was completed by Coastal Planning and Engineering/CBI
in February 2015. Capri Pass meets the Marco River on the north side of Marco Island in Collier
County, Florida and is flanked to the east by the Ville de Marco West condominium (VDMW)
and to the west by a terminal jetty on Marco Point, the eastern end of Hideaway Beach. This
creek is used by local boaters to access Collier Bay, residences and the Esplanade Shoppes on
Smokehouse Bay. Residents of Marco Island have raised concerns to Collier County about the
safety of boaters navigating through Collier Creek's entrance and the amount of scouring that is
occurring at the VDMW seawall and docks. As sand migrates east from Hideaway beach, it is
overtopping the terminal jetty and infilling the already narrowing entrance to Collier Creek.
Collier Creek meets the Marco River at a right angle and strong currents from the River are
creating turbulence along the eastern side of the Creek entrance at VDMW.
Through detailed survey, reconnaissance level investigations, public testimony and a cursory
engineering analysis of the area, CB&I developed several potential solutions to stabilize this bay
inlet.
1. Enlarge Entrance Channel to Equilibrium Cross Section
2. Move Terminal Jetty West
3. Remove Terminal Jetty
4. Adjust the Terminal Jetty
5. Modify Dredging Practices
6. Coastal Structures to Realign and Streamline the Creek Further to the West
7. Constrain the Flow in Collier Creek
In most probability, the successful solution to a stabilize Collier Creek will most likely employ a
combination of solutions listed above. To assure the correct combination, a numerical modeling
study is recommended. This study will however require time to execute and validate. Due to
safety concerns, Collier Creek will need to be stabilized first through dredging to allow sufficient
time for the most effective solution to be identified. The modeling effort will be able to provide
additional assurances in the chosen structural and sediment management modifications, prior to
construction.
The attached proposal from Coastal Planning and Engineering/CBI will provide the engineering
and permitting needed to obtain a Notice-to-Proceed (NTP) from FDEP to proceed with the
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dredging. This approach will stabilize the inlet for a sufficient period of time to allow the proper
investigation and modeling to occur and to assure the proper long term solution.
There is a history of utilizing Tourist Development Tax (TDC) funds to maintain this inlet. This
inlet was dredged in 2001 and 2012 and a terminal jetty was installed in 2005 using TDC funds.
Dredged sand will be pumped and placed to the public Central Marco beaches to eliminate
ponding and improve drainage. Thirty percent (30%) to forty percent (40%) of the Marco Island
boat traffic use this inlet to access the Gulf and public marina at Smokehouse Bay.
FISCAL IMPACT: Funding for the proposed work order is not presently included in the
budget. However, sufficient funding is available in Tourist Development Tax Fund (195)
reserves. A budget amendment will be necessary to move funds from reserves into Project No.
90064, Collier Creek. Funding for this project will not be requested for reimbursement from any
grantor agency.
GROWTH MANAGEMENT IMPACT: There is no impact to the Growth Management Plan
related to this action.
ADVISORY COMMITTEE RECOMMENDATIONS: At the March 12, 2015 Coastal
Advisory Committee (CAC) meeting, this was unanimously recommended for approval by a 6 to
0 vote.
At the March 23, 2015 Tourist Development Council (TDC) meeting, this item was unanimously
recommended for approval by a 6 to 0 vote.
LEGAL CONSIDERATIONS: Pass and inlet maintenance is an authorized expenditure
pursuant to the Tourist Development Tax Ordinance No. 92-60, as amended. This item requires
the TDC to make a recommendation and the Board to make a finding that this expenditure
promotes tourism. This item has been approved as to form and legality and requires majority
vote for approval. - CMG
RECOMMENDATION: Recommendation that the Board of County Commissioners accepts a
proposal from CB&I Coastal Planning & Engineering dated March 10, 2015 for Collier Creek
Dredging Project Design, Permitting and Bid Assistance, approve a work order under Contract
No. 13-6164-CZ for a not to exceed amount of$68,845.90, authorize the County Manager or his
designee to execute Work Order, authorize necessary budget amendment and make a finding that
this item promotes tourism.
Prepared by: J. Gary McAlpin, P.E., Coastal Zone Management, Capital Project Planning,
Impact Fees and Program Management Division, Growth Management Department
Attachments: A) Draft Feasibility Study Collier Creek: and B) Work Order/Proposal
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COLLIER COUNTY
Board of County Commissioners
Item Number: 16.16.A.16.A.12.
Item Summary: Recommendation to accept a proposal from CB&I Coastal Planning &
Engineering dated March 10, 2015 for Collier Creek Dredging Project Design, Permitting and Bid
Assistance, approve a work order under Contract No. 13-6164-CZ for a not to exceed amount of
$68,845.90, authorize the County Manager or his designee to execute Work Order, authorize
necessary budget amendment and make a finding that this item promotes tourism (Project No.
90064).
Meeting Date: 4/14/2015
Prepared By
Name: HambrightGail
Title: Accountant, Coastal Zone Management
3/16/2015 3:22:52 PM
Submitted by
Title: Accountant, Coastal Zone Management
Name: HambrightGail
3/16/2015 3:22:53 PM
Approved By
Name: McAlpinGary
Title:Manager-Coastal Management Programs, Coastal Zone Management
Date: 3/18/2015 11:46:01 AM
Name: PuigJudy
Title: Operations Analyst,Community Development&Environmental Services
Date: 3/18/2015 2:55:11 PM
Name: HerreraSandra
Title: Manager-Procurement, Purchasing&General Services
Date: 3/20/2015 2:46:31 PM
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Name: JohnsonScott
Title: Manager-Procurement, Purchasing&General Services
Date: 3/20/2015 4:27:42 PM
Name: MarkiewiczJoanne
Title: Division Director-Purchasing&Gen Svc, Purchasing&General Services
Date: 3/23/2015 8:27:53 AM
Name:NorthrupAdam
Title: Procurement Specialist, Purchasing&General Services
Date: 3/23/2015 8:34:07 AM
Name: Tara Castillo
Title: Management/Budget Analyst, Road Maintenance
Date: 3/25/2015 9:05:10 AM
Name: KearnsAllison
Title: Manager Financial & Operational Support, Transportation Administration
Date: 3/25/2015 10:56:46 AM
Name: PattersonAmy
Title: Manager-Impact Fees &EDC, Business Management&Budget Office
Date: 3/26/2015 12:44:40 PM
Name: GreeneColleen
Title: Assistant County Attorney, CAO General Services
Date: 3/27/2015 1 1:22:18 AM
Name: MarcellaJeanne
Title: Executive Secretary, Transportation Planning
Date: 3/27/2015 2:35:03 PM
Name: OberrathKaren
Title: Accountant, Senior, Grants Management Office
Date: 3/31/2015 10:54:51 AM
Name: KlatzkowJeff
Title: County Attorney,
Date: 3/31/2015 3:45:40 PM
Name: StanleyTherese
Title: Manager-Grants Compliance, Grants Management Office
Date: 4/1/2015 5:06:26 PM
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Name: CasalanguidaNick
Title: Deputy County Manager, County Managers Office
Date: 4/6/2015 7:58:15 AM
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FEBILI S
COLLIER ASI CREEK
COLLIER COUNTY, FL
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Prepared for:
Coastal Zone Managem D
Collier County, Florida ent epartment
Prepared by:
CB&I Coastal Planning & Engineering, Inc.
February 2015
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FEASIBILITY STUDY
COLLIER CREEK
COLLIER COUNTY, FL
EXECUTIVE SUMMARY
The primary objectives of this study are to identify the current issues at the Collier Creek
entrance and to identify potential solutions. The area of concern is the entrance to Collier Creek
which meets the Marco River on the north side of Marco Island in Collier County, Florida and
will focus on the area from monument H-14 (near the easternmost T-groin) east to H-16. The
Creek entrance is flanked to the east by the Ville de Marco West condominium (VDMW) and to
the west by a terminal jetty on Marco Point, the eastern end of Hideaway Beach. This creek is
used by local boaters to access Collier Bay, residences and the Esplanade Shoppes on
Smokehouse Bay.
Residents of Marco Island have raised concerns to Collier County about the safety of boaters
navigating through Collier Creek's entrance and the amount of scouring that is occurring at the
VDMW seawall and docks. As sand migrates east from Hideaway beach, it is overtopping the
terminal jetty and infilling the already narrowing entrance to Collier Creek. Collier Creek meets
the Marco River at a right angle and strong currents from the River are creating turbulence along
the eastern side of the Creek entrance at VDMW.
CB&I conducted site visits and a reconnaissance level field investigation to identify the current
conditions of this area and recorded that turbulent conditions are present at the Creek's entrance
in the hours around peak tides and are stronger on incoming tides. Through cursory engineering
analysis of this area, CB&I presents several potential solutions in this feasibility study.
1. Enlarge Entrance Channel to Equilibrium Cross Section
2. Move Terminal Jetty West
3. Remove Terminal Jetty
4. Adjust the Terminal Jetty
5. Modify Dredging Practices
6. Coastal Structures to Realign and Streamline the Creek Further to the West
7. Constrain the Flow in Collier Creek
It is recommended that alternatives 1, 2 4 and 5 be implemented to improve inlet performance.
Prior to adjusting the terminal jetty, a numerical modeling study is recommended. The modeling
effort will be able to provide additional assurances in the chosen structural and sediment
management modifications, prior to construction. If the jetty cannot be moved sufficiently west,
then removal of the terminal jetty should be considered. Early coordination with FDEP and State
Lands is essential, prior to selecting the final configuration.
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FEASIBILITY STUDY
COLLIER CREEK
COLLIER COUNTY, FL
TABLE OF CONTENTS
1.0 INTRODUCTION 1
2.0 BACKGROUND AND HISTORY 1
2.1 Historic Engineering of Collier Creek 3
2.2 Historic Beach Nourishment/Engineering at Hideaway Beach 3
2.3 Historic Aerial Review 5
3.0 SITE VISIT 5
4.0 SURVEY METHODS 5
5.0 ENGINEERING ANALYSIS 7
5.1 Description of Data Utilized for Analysis 7
5.2 Channel Cross Section Analysis 7
5.3 Volumetric Change Analysis 8
5.4 Channel Currents Analysis 11
5.5 Inlet Stability Analysis 12
5.6 Sediment Quality Analysis 13
6.0 COASTAL PROCESSES ANALYSIS 14
7.0 ENVIRONMENTAL PROTECTION 15
8.0 ALTERNATIVES DEVELOPMENT 19
9.0 GOVERNMENT PROCESS 23
10.0. RECOMMENDATIONS 24
11.0 REFERENCES 26
List of Figures
Figure No.
Figure 1. Project Location Map 2
Figure 2. CB&I Survey Vessel in Collier Creek 6
Figure 3. Delta Plot 2005 vs. 2014 10
Figure 4. Plot of Measured and Predicted Tides 11
Figure 5. Currents Plotted in Cross Section 12
Figure 6. Sample Locations 14
Figure 7. Environmental Resources 16
Figure 8. Jetty Relocation Alternative 21
List of Tables
Table No.
1. Survey Control 5
2. Profile Station Control 6
I I
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FEASIBILITY STUDY
COLLIER CREEK
COLLIER COUNTY, FL
TABLE OF CONTENTS
3. Volume Changes December 2005 to December 2014 9
4. December 2014 Channel Area Below 0 ft. NAVD 13
5. Sediment Quality Summary 13
List of Appendices
Appendix No.
A. Stakeholder Meeting Minutes
B. Historic Aerial Photographs
C. Field Observation Report
D. Certified Survey Drawings
E. Profile Plots
F. Granularmetric Reports & Grain Size Distribution Curves
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FEASIBILITY STUDY
COLLIER CREEK
COLLIER COUNTY, FL
1.0 INTRODUCTION
The primary objectives of this study are to identify the current issues at the Collier Creek
entrance and to identify potential solutions. The area of concern is the entrance to Collier Creek
which meets the Marco River on the north side of Marco Island in Collier County, Florida and
will focus on the area from monument H-14 (near the easternmost T-groin) east to H-l6.
Residents of Marco Island have raised concerns to Collier County about the safety of boaters
navigating through Collier Creek's entrance and the amount of scouring that is occurring at the
Ville de Marco West condominium (VDMW) seawall and docks. As sand migrates east from
Hideaway beach, it is overtopping the terminal jetty and infilling the already narrowing entrance
to Collier Creek. Collier Creek meets the Marco River at a right angle and strong currents from
the River are creating turbulence along the eastern side of the Creek entrance at VDMW.
CB&I conducted site visits and a reconnaissance level field investigation to identify the current
conditions of this area and recorded that turbulent conditions are present at the Creek's entrance
in the hours around peak tides and are stronger on incoming tides. Through cursory engineering
analysis of this area, CB&I presents several potential solutions in this feasibility study. Further
analysis and modeling are recommended before implementing a solution.
2.0 BACKGROUND AND HISTORY
Collier Creek is located on the north side of Marco Island and connects the Collier Bay to the
Gulf of Mexico via the Marco River (Figure 1). The Creek entrance is flanked to the east by
VDMW and to the west by a terminal jetty on Marco Point, the eastern end of Hideaway Beach.
The Creek is subject to twice daily tides (semidiurnal) and is generally protected from waves by
Hideaway Beach and Capri Pass Shoals.
This creek is used by local boaters to access Collier Bay, residences and the Esplanade Shoppes
on Smokehouse Bay. Recently, sand has been overtopping the terminal jetty and infilling the
entrance to Collier Creek. Narrowing of the channel and increased currents have made
navigation difficult through the Creek at certain times of day. To keep the Creek open for
navigation in the past, dredging and the construction of a terminal jetty on the western shore of
the entrance have been implemented. After review of historic permits and interviews with
stakeholders, a brief history of the engineering of the Collier Creek area has been compiled and
is presented below. Notes from the stakeholder meetings and interviews can be found in
Appendix A.
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Notes: Legend:
1. Coordinates are in feet based on the Profile Stations
Florida State Plane Coordinate System, State Parks and Recreational Lands
East Zone, North American Datum of 1983 (NA
83).
2. 2014 aerial photography provided by Collier Property Appraiser's Parcels
Collier County, date flown December 18 & 19, 2013.
Figure 1.Project Location Map
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2.1 Historic Engineering of Collier Creek
March 2001: Major permit modification to 11-2934539. Permitted dredging of the
entrance channel to Collier Bay (aka Collier Creek) and installation of two additional
temporary (geotextile) T-groins on Hideaway Beach (at H-2 and H-11).
May — July 2001: Dredged to -10 ft. NVGD. Approximately 24,100cy of sand dredged
and placed between H-10 and H-12 on north Hideaway Beach.
2001-2003: VDMW replacement of seawall and 10 finger piers and installation of
concrete armor mat and sheet pile toe wall.
January 2005: Permit no. 0222764-001-JC approved for beach nourishment on
Hideaway Beach and construction of 10 permanent T-groins (replacing 7 geotextile
structures) and a terminal jetty. Permit includes approval for dredging of approximately
240,000cy from Big Marco Pass ebb shoal.
May 2005: Permit modification 0222764-003-EM. Jetty design modified by lengthening
the north end by 33 feet and shortening the south end by 33 feet. The bend in the structure is to
remain at the originally permitted location, The purpose of the jetty was to extend the
longevity of the beach fill and reduce the frequency of beach nourishment intervals.
However, the beach at the jetty site has recently accreted, such that if the jetty were
constructed as originally permitted, the structure would be located almost entirely upland
of the 0.0' contour. Shifting the location and configuration of the jetty to fit the new
shoreline will allow the structure to achieve the design intent. The modified jetty design
lies within the borders of the easement granted by the state.
December 2005: Terminal jetty construction completed. 136,350cy placed at South Point
(T-128 to H-4) and 180,420cy placed at Royal Marco Point (H-9 to H-13). 10 permanent
T-groins constructed, 5 in each area, and a terminal jetty at Collier Creek entrance.
August 2011: Permit no. 0305112-001-JC approved dredging of approximately 12,000cy
from Collier Creek entrance to maximum cut elevation of-12.3 ft. NAVD88. Place the
material along Hideaway Beach between H-12 and H-14.
2012: Maintenance dredging of Collier Creek entrance completed.
December 2012: Permit no. 0309260-001-JC approved nourishment of Hideaway Beach
between, H-1 & H-7, H-4 & H-9, and H-9 & H-l3. Included the addition of 3 permanent
T-groins on the north end of Hideaway Beach between H-12 to H-14. Permit also
proposed modification of the terminal jetty. CEC proposed relocation to the west and
extension of the tip.
2.2 Historic Beach Nourishment/Engineering at Hideaway Beach
Although this feasibility study is focused on the entrance of Collier Creek, events on the
entire Hideaway Beach (H-1 to H-16) and the migration of offshore shoals contribute to
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the conditions in the creek. In the past 25 years, a total of 15 T-groins have been
constructed in several phases, the beach has been renourished with sand dredged and
trucked from various sources, Coconut Island has disappeared and Sand Dollar Island has
grown and migrated. A brief history is chronicled below:
1990/91: Approximate beach restoration of southwest Hideaway Beach.
1997: Five temporary geotextile T-groins installed: 2 at South Point and 3 at Royal
Marco Point.
February 2000: Permit 11-2934539 approved repair and adjustment to temporary T-
groins and fill placement. Mod-01 includes permitting for use of a nearshore sand source.
2001: Two temporary geotextile T-groins installed.
January 2005: Permit no. 0222764-001-JC approved beach nourishment on Hideaway
Beach and construction of 10 permanent T-groins (replacing 7 geotextile structures) and a
terminal jetty. Includes dredging of approximately 240,000cy from Big Marco Pass ebb
shoal.
May 2005: Permit modification 0222764-004-EM extended the fill template at Royal
Marco Point by 500 feet with additional placement of 20,000 cy of sand.
July 2005: Permit modification 0222764-005-EM extended and deepened the permitted
Borrow Area.
December 2005: Construction completed. 136,350cy placed at South Point (T-128 to H-
4) and 180,420cy placed at Royal Marco Point (H-9 to H-13). 10 permanent T-groins
constructed; 5 in each area and a terminal jetty at Collier Creek entrance.
September 2008: Permit 11-0222764-008 for construction of riprap revetment for
shoreline stabilization between H-7 and H-9. Emergency revetment was constructed
between South Point and Royal Marco Point T-groin fields.
February 2010: Major permit modification 0222764-006-EM for second phase of
project including construction of 6 additional permanent T-groins and placement of
122,000cy of sand on Hideaway Beach between H-4 and H-9.
December 2012: Permit no. 0309260-001-JC approved nourishment of Hideaway Beach
between, H-1 & H-7, H-4 & H-9, and H-9 & H-13. Included the addition of 3 permanent
T-groins on the north end of Hideaway Beach between H-12 to H-14. Permit also
addressed modification of the teiuiinal jetty. CEC proposed relocation to the west and
extension of the tip.
March-July 2013: Excavation of 30,000cy from the nearshore borrow area.
Approximately 25,000cy were placed on North Beach (H-12 to H-14) and 5,000cy were
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placed on Royal Marco Point and Central Beach (H-4 to H-11). Construction of 3 new T-
groins.
2.3 Historic Aerial Review
A review of GoogleEarth aerial photographs covering the study area is presented in
Appendix B. The aerials illustrate the timing of groin construction and the evolution of
Coconut and Sand Dollar islands and the changing conditions of Marco Point and the
west side of Collier Creek.
3.0 SITE VISIT
A site visit was conducted of Collier Creek on Marco Island on December 11, 2014. The
objectives of the site visit were to meet with stakeholders, evaluate the specific conditions of the
junction between Collier Creek and the Marco River and observe the beach conditions of Marco
Point on the west side of the creek. The findings from the stakeholder meeting and the
observations documented during this site visit are incorporated into the feasibility analysis report
and details can be found in the field observation report in Appendix C.
4.0 SURVEY METHODS
This survey is in accordance with Chapter 5J-17, Florida Administrative Code (F.A.C.)
Standards of Practice as established by the Florida Board of Professional Surveyors and Mappers
pursuant to Chapter 472 of the Florida Statutes. All work was conducted under the direct
supervision and responsible charge of a Professional Surveyor and Mapper (PSM) who is
registered in the State of Florida. Survey data was collected December 16, 2014 through
December 18, 2014. A signed and sealed Topographic and Hydrographic Survey Map is
provided in Appendix D.
Vertical data was collected in the North American Vertical Datum of 1988 (NAVD 88). All
horizontal data is provided in the Florida State Plane Coordinate System, East Zone, North
American Datum of 1983/2011. The survey control was sourced from the National Geodetic
Survey (NGS) and the Florida Department of Environmental Protection (FDEP). Corpscon6.0
was used for geodetic conversions from the National Geodetic Vertical Datum of 1929
(NGVD29) to NAVD88. It should be noted that 64-878-A25-2 and 64-73-A24 were originally
published in NAD27 and later converted to NAD83/90 by the FDEP. The converted values were
consistent with the NAD83 (2011) values obtained using RTK GPS from NGS published control
and were therefor not updated.
Table 1. Survey Control
Stamping Northing Easting Elevation
64 878 A25-2 585065.02 413941.24 N/A
64-73-A24 588145.05 410914.71 2.318
872 4991 C Tidal N/A N/A 4.40
872 4991 D Tidal 591727.19 417229.65 2.1
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The offshore survey was conducted using an ODOM Hydrotrac sounder with digitizer on CB&I's
24-foot Privateer survey vessel with a centrally located hull-mounted transducer (Figure 2). A
Trimble SPS461 DGPS and a TSS DMS-25 Motion Compensator were used onboard the survey
vessel to provide navigation and attitude corrections. Water level corrections were based on
manual RTK GPS water level measurements and the NOAA water levels recorded at station
8725110, Naples, FL. In order to maintain the vessel navigation along the profile lines
HYPACK navigation software was used. This software provided horizontal positions to the
sounding data allowing real-time review of the data in plan view or cross section format.
HYPACK also provided navigation to the helm to minimize deviation from the online azimuth.
x ---,-7 u z 4 ,±,q'�aa"4,s ,r,,Fx Nt ,' ve. c
k i a- a G.yy t t- e. fig*" xj jam 1
rl r'
/
/
fi
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t xtt a (u .:Al `d Y ` S ,ryM
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a
Figure 2. CB&I Survey Vessel in Collier Creek
Topographic data was collected concurrently with the boat operations. Topographic data was
collected on the piers and seawalls within the study area along the eastern shore of collier creek
using RTK GPS methods. The approximate location of the teiiiiinal groin was located where
exposed. Upland sections of the "H" profiles and "C" profiles were also collected using RTK
GPS. Profile station locations are provided in Table 2.
Table 2. Profile Station Control
Stamping Northing Easting Azimuth
H-12 596064.92 413748.34 317.51
H-13 596373.52 414134.34 317.51
H-14 596628.92 414569.15 317.51
H-15 596680.12 415191.15 317.51
C-1 597116.4 414927.15 47.51
C-2 596968.92 415062.24 47.51
C-3 596821.44 415197.33 47.51
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Stamping Northing Easting Azimuth
C-3.5 596747.7 415264.87 47.51
H-16 596673.92 415332.45 317.51
C-6 596476.92 415366.99 80.06
C-7 596279.93 415401.54 80.06
C-8 596082.93 415436.08 80.06
C-9 595885.94 415470.62 80.06
C-10 595688.95 415505.16 80.06
C-11 595491.95 415539.7 80.06
5.0 ENGINEERING ANALYSIS
5.1 Description of Data Utilized for Analysis
An examination of the available data was performed to assess the coastal processes of the study
area. The data analyzed includes: topographic and hydrographic surveys conducted by Humiston
& Moore Engineers (H&M) and CB&I Coastal Planning & Engineering, Inc. (CB&I f/k/a CPE),
current measurements collected by CB&I, GoogleEarth aerial photography and anecdotal
evidence/observations during field visits conducted on December 11th, 16th, 17th & 18th, 2014.
The survey data utilized for the analysis is summarized below.
April 2005—Hideaway Beach T-groin pre-construction survey (H&M)
December 2005—Hideaway Beach T-groin post-construction survey (H&M)
December 2006—Hideaway Beach T-groin 12-month monitoring survey (H&M)
July 2007—Hideaway Beach T-groin 18-month monitoring survey (H&M)
December 2009—Hideaway Beach 4-year post-construction monitoring survey (CPE)
December 2014—Feasibility analysis survey (CB&I)
5.2 Channel Cross Section Analysis
Comparative cross-section profile plots of Collier Creek are included in Appendix E. These
cross-sections illustrate changes in the Creek"s depth, width and cross-section area between April
2005, before the terminal jetty was installed, and December 2014. The timeframe represented by
the surveys can be broken into three time periods for discussion of the changes:
1) 2005:jetty installed
2) 2007/09: interim equilibrium established
3) 2014: represents the current condition and illustrates the combined effects of excess
sand and the jetty on the channel equilibrium
Review of the channel cross sections has revealed the following trends over the last nine years:
Ebb Shoal: In 2014, the ebb shoal around C-3 shows a smaller cross-sectional area, with
a narrower and shallower bottom profile (below -10ft NAVD) and a narrower top width
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compared to the 2005 conditions. The results of the last maintenance dredging are not
clearly apparent in this area.
Inlet Throat: The inlet throat is located between the terminal jetty and the VDMW
seawall near profile C-3.5. This cross-section has a smaller cross-sectional area with a
shallower and narrower bottom in 2014 than it did in 2005. The latest maintenance
dredging event in 2012, made the top of the channel wider above approximately -5ft
NAVD.
Main Channel: In general, the main channel (C-6 to C-11) cross sections have gotten
moderately smaller and shallower. The cross-sectional area of these main channel
profiles has either been reduced or has remained the same over the past nine years. The
top width of the channel cross sections, vary profile to profile with some being wider,
while others are about the same as they were in 2005.
Shrinking of the inlet cross sections is visible in the profile plots. It appears that the terminal jetty
has made the inlet throat narrower and shallower, which has impacted the entire channel. This
trend was likely aggravated by excess sand from recent nourishment and dredge disposal
operations updrift of Collier Creek on Hideaway Beach. The 2012, recent dredging event had its
greatest benefit above -10ft NAVD where it increased the channel's width. Scouring forces that
are needed to maintain the channel depth cannot overcome the recent deluge of sand entering the
inlet.
Although natural forces may be able to slowly correct this trend in the future, it would be best to
address the terminal jetty and excess sand that are contributing to the shrinking of the inlet cross
section. To return the inlet to a more natural cross-sectional area, the goal would be to re-
establish the April 2005 cross-section between C-3 and H-16_63.8°. The Creek's west bank
would need to retreat approximately 20 to 60 feet (this amount varies by depth and profile
location) and the channel would need to deepen by approximately 5 to 10 feet.
5.3 Volumetric Change Analysis
Using survey data from December 2005 and December 2014, a volume change analysis was
conducted of the study area over the nine-year timeframe after construction of the terminal jetty.
The region was divided into six areas for the volume calculations as shown in Figure 3 and
reported in Table 3. The Collier Creek area extends from profile C-3.5 to C-11; the Ebb Shoal
area covers the entrance to Collier Creek; the Marco Point Beach area extends from H-14 to H-
16 and up to 300 ft. offshore. There are three offshore regions that extend to the northern shore
of the Marco River: Offshore Beach, Offshore Ebb Shoal and Offshore VDMW.
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Table 3. Volume Changes December 2005 to December 2014
Loss (cy) Gain (cy) Net (cy)
Collier Creek Area (C) 6,250 8,290 2,040
Ebb Shoal Area (E) 1,230 4,040 2,810
Offshore Ebb Shoal (OSE) 16,070 1,700 -14,370
Marco Point Beach Area(B) 20,050 830 -19,220
Offshore Beach (OSB) 18,030 14,030 -4,000
Offshore Ville de Marco West 15,880 4,560 -11,320
(OS-VDMW)
Although sand has been placed on Hideaway Beach and Marco Point during this time period, the
Marco Point beach area has experienced erosion over the past nine years. This region is east of
the last installed T-groin and does not have any shore stabilizing structures. It appears that the
beach area may be losing sand offshore and to the ebb shoal region to the east. This could be a
result of a physical channel within Marco River reestablishing itself along the shore of Marco
Point.
The ebb shoal region has been largely accretional since 2005. A shoal with gains of up to 4 ft. of
elevation, exists in the center of the entrance to Collier Creek and contributes to the turbulence
and high currents. East of the ebb shoal, scouring has occurred near the VDMW observation
dock.
The interior portion of Collier Creek has been relatively stable compared to the area closer to the
throat (around C-3.5) which has experienced gains and losses of up to +/-5 ft. in elevation. On
the western shore of the Creek near H-16, erosion has occurred since 2005 while, on the eastern
shore, H-16 has accreted possibly due to underwater construction and improvements to the
VDMW seawall and sand entering the inlet and forming the ebb shoal.
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5.4 Channel Currents Analysis
Due to project constraints, the survey did not occur during a peak tidal cycle. This fact is
recognized and taken into consideration during the evaluation of alternatives within this report. It
is recommended that a more detailed analysis of the currents in the Creek be conducted using the
deployment of ADCPs during a complete lunar month to capture the variability of currents
throughout the entire cycle.
Currents were measured around piers and docks on the eastern shore (at VDMW) and along two
cross sections (H-16 and C-3); Figure 6 shows sample locations. The currents were collected to
characterize the flow at the entrance to Collier Creek. During the field investigation conducted
by CB&I, the tides were measured and are shown compared to the predicted tides in the Marco
River and the measured and predicted tides of Naples according to a NOAA tide gauge (Figure
4). Profile cross sections of H-16 and C-3 including the collected current measurements are
provided in Figure 5.
---RTK Measured Water Level - - Marco River Predicted NOAA Gauge Naples,FL -----Naples Predicted Currents
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Figure 4. Plot of Measured and Predicted Tides
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5.5 Inlet Stability Analysis
An inlet stability analysis was conducted, and it was found that the inlet is nearly stable.
Table 4 provides the December 2014 cross sectional channel areas that were calculated below 0
ft. NAVD, the width(east to west) of the 2014 channel and the section length (north to south) for
each profile in Collier Creek. The available data is not sufficient to explicitly identify where the
existing conditions are on the stability curve but does provide information about the general
conditions at two cross-sections. At profile C-3.5, the inlet is being constrained by both the
terminal jetty and sand depositing in the inlet. At profile H-16, the inlet is scouring to create a
wider cross section but has become progressively shallower since the jetty was built in 2005. The
equilibrium throat's cross sectional area below 0 ft.NAVD is approximately 2,000 ft2. Addition
data would be necessary to complete a more detailed stability analysis.
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Table 4 December 2014 Channel Area Below 0 ft. NAVD
Perpendicular Section Length
Profile Line Area($2) Width(ft) ($)
C3 3,225 248 150
C3.5 1,938 179 100
H1663 ` 1,832 240 150
C6 1,884 226 200
C7 1,909 227 200
C8 1,948 200 200
C9 2,026 230 200
C10 2,138 230 200
C11 2,303 311 100
5.6 Sediment Quality Analysis
As part of the field investigation, 5 sediment samples were collected and analyzed. One sample
was collected on the dry, mid-beach near H-14 and four samples were collected within Collier
Creek using a ponar grab sampler. A map showing the location of sediment samples collected is
provided in Figure 6. Sieve results in the form of granularmetric reports and grain size
distribution curves are provided in Appendix F and summarized in Table 5.
Table 5 Sediment Quality Summary
Sample Name USCS Mean Grain Silt Content (%) Dry Munsell
Classification Size (mm) Color
Beach-01 SW 0.25 1.49 5Y-8/1
CC-01 SW 1.46 1.54 5Y-8/1
CC-02 SW 0.31 1.22 2.5Y-8/1
CC-03 SW 0.76 1.23 2.5Y-8/1
CC-04 SW 0.23 1.45 2.5Y-8/1
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2,2014 aerial photography provided by o,q �,.,,3,3 ,,,.
Collier County,date flown December 18&19,2013. a,�.,. �;?�;,r,,: .a. m 1, a;iAt
Figure 6. Sample Locations
6.0 COASTAL PROCESSES ANALYSIS
The coastal processes since December 2005 are illustrated in Figure 3 and Table 3, and are
discussed in this section. The elevation change chart shows areas of erosion that proceed into
down drift areas of accretion. The large erosion region at the beach of Marco Point lost 19,200
cy since December 2005 and the accreting areas offshore of Marco Point, the ebb shoal and
Collier Creek gained 18,400 cy during the same period. This correlation between loses and gains
suggests the main pathways for the sand transport. It appears that sand eroding from Hideaway
Beach is transported into Area B (beach and nearshore east of H-14), which is downdrift of the
last T-Groin, and then proceeds into Area OS-B (offshore beach) and Area E (ebb shoal); losses
from Area E move into Area C (Collier Creek).
By combining the volumetric changes associated with each region on Figure 3, with knowledge
of the dredge and fill activities during this timeframe, we gain an understanding and how the
installation of the terminal jetty in 2005 and dredging has affected the area. It is apparent, that
the combined influences of the jetty and the large amount of sand depositing into the ebb shoal
and main channel of Collier Creek have led to the conditions causing the high currents and
turbulence. Inlet cross sections at the Creek entrance have become smaller due to sand
deposition and the jetty location. Similar turbulent effects from this type of narrowing are seen
at Haulover Inlet and South Lake Worth Inlet on the Florida east coast.
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7.0 ENVIRONMENTAL PROTECTION
The following information describes the environmental resources located in the vicinity of the
study area, including Collier Bay, Collier Creek, and along the beach and nearshore marine
habitat along Hideaway Beach between H-1 and H-16. Figure 7 shows the location of these
resources relative to the study area.
7.1 Threatened and Endangered Species
Sea Turtles
Five species of sea turtles can be found in Florida waters: loggerhead (Caretta caretta), green,
(Chelonia mydas), leatherback (Dermochelys coriacea), hawksbill (Eretmochelys imbricata),
and Kemp's ridley (Lepidochelys kempii). Green (Florida breeding populations), leatherback,
hawksbill, and Kemp's ridley sea turtles are federally listed as endangered, and the Northwest
Atlantic distinct population segment (DPS) of loggerheads is federally listed as threatened. Of
the five species, only loggerhead and green sea turtles are documented as nesting on Collier
County beaches. During the 2013 nesting season, two green sea turtle nests and 1,091 loggerhead
sea turtle nests were recorded on Collier beaches (FWC, 2013). Along the City of Marco Island,
which encompasses 7.1 miles of beach from inside Big Marco Pass (Hideaway Beach [H-1 to H-
16]) south to Caxambas Pass (R-131 to R-148), there were 93 loggerhead nests documented
during the 2013 nesting season(CCPRD, 2014).
The study area is not located within the nearshore reproductive or terrestrial critical habitat areas
for the threatened loggerhead sea turtle (Caretta caretta). However, there are critical habitat
areas designated on the north side of Big Marco Pass for NWA DPS of loggerhead sea turtles:
both the nearshore reproductive critical habitat LOGG-N-26 and the terrestrial critical habitat
LOGG-T-FL-28 span from Big Marco Pass north to Gordon Pass (79 FR 39755).
Collier County minimizes impacts to sea turtles by constructing projects outside of sea turtle
nesting season and by complying with NMFS's Sea Turtle and Smalltooth Sawfish Construction
Conditions (NMFS, 2006), which include education of project personnel on how to monitor for
and respond to the presence of sea turtles during water-related project activities. Additionally,
any use of hopper dredging would comply with the NMFS Gulf of Mexico Regional BO for
Hopper Dredging (NMFS, 2003). Collier County will collect annual sea turtle nesting,
escarpment and lighting surveys in compliance with all permit requirements.
Florida Manatee
The study area is located within both critical habitat and protection areas for the endangered
Florida manatee (Trichechus manatus latirostris). Critical habitat for the Florida manatee is
designated for all U.S. territorial waters adjoining the coast and islands and all connected bays,
estuaries, and rivers from Gordon Pass, Collier County southward to and including Whitewater
Bay, Monroe County (50 CFR Part 17.95[a]). Manatee protection areas (FAC 68C-22) were
established as part of the Florida Manatee Sanctuary Act (§379.2431(2), F.S.) to protect
manatees and their habitat. The manatee protection area adjacent to the Project Area regulates
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the speed and operation of motorboats, requiring vessels to remain at "idle speed" while
operating in the protection area. The current available estimate of the Florida manatee population
is 4,824 individuals (2,509 on the west coast), based on synoptic aerial surveys of warm-water
sites on the east and west coasts of Florida in 2014 (FWC, 2014). Aerial distribution surveys
conducted from May 2006 to June 2008 in Collier County documented manatees within Collier
Bay, Big Marco Pass, and offshore of Tigertail Beach County Park (FWC and FWRI, 2008).
Potential project-related impacts to manatees will be avoided by compliance with FWC's
Standard Manatee Construction Conditions for In-Water Work (FWC, 2011), which include:
operation of vessels at `idle speed/no wake' at all times while in the immediate area and when
the draft of the vessels provides less than four feet of clearance from the bottom; immediate
shutdown of all in-water operations if a manatee comes within 15 m (50 ft) of construction
activities; posting of temporary signs concerning manatees prior to and during all in-water
activities; use of turbidity barriers that manatees cannot become entangled in; and, reporting any
collisions or injury to a manatee to FWC and USFWS.
Smalltooth Sawfish
The Project Area is not located within critical habitat areas for the endangered smalltooth
sawfish (Pristis pectinata). The two designated units are located north (Charlotte Harbor Estuary
Unit) and south (Ten Thousand Islands/Everglades Unit) of the Project Area (73 FR 45353).
However, the smalltooth sawfish does have the potential to occur within the Project Area.
According to the National Sawfish Encounter Database, 45 smalltooth sawfish encounters were
reported in Collier County from May 2010 to May 2011 (NSED, 2014).
Project construction will comply with NMFS's Sea Turtle and Smalltooth Sawfish Construction
Conditions (NMFS, 2006) to minimize impacts to smalltooth sawfish during project activities.
These conditions stipulate that if a sawfish is observed within 91 m (300 ft) of construction
operations, all appropriate precautions shall be implemented to ensure its protection, including
cessation of operation if the animal moves within 15 m (50 ft) of any moving equipment. Any
collision or injury to a sawfish must be reported immediately to NMFS.
Piping Plover
Piping plovers (Charadrius m.elodus) are considered threatened throughout their wintering range
(USFWS, 2009). This species is also federally protected under the Migratory Bird Treaty Act
(MBTA) of 1918, and is State-listed in Florida as threatened. A portion of the Project Area is
located within designated piping plover critical habitat . Piping plover critical habitat unit FL-27
primarily includes the Tigertail Beach County Park, as well as Sand Dollar Island, Coconut
Island, and all emerging sand bars in Big Marco Pass. The unit does not include Hideway beach
(66 FR 36038). The critical habitat area was established to protect the threatened and endangered
populations (Great Lakes, Northern Great Plains, and Atlantic) of piping plovers on their
wintering grounds. According to the e-Bird database, there were 399 piping plovers observed in
Collier County in 2014, including observations on Tigertail Beach County Park, Sand Dollar
Island, and in Big Marco Pass (e-Bird, 2015a).
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It is likely that construction of the proposed Project will be required to follow the Conservation
Measures outlined in the USFWS Programmatic Piping Plover Biological Opinion (P3BO),
which addresses impacts from shore protection activities on the non-breeding piping plover
(USFWS, 2013). These measures may include: implementation of surveys for non-breeding
shorebirds (including red knots), placement of equipment in areas that would not be expected to
be utilized by shorebirds, and other efforts such as a designated travel corridor for driving on the
beach for construction, predator-proof trash receptacles, wrack protection, and educational signs
at public access points.
Rufa Red Knot
The rufa red knot(Calidris canutus rufa), a subspecies of the red knot (C. canutus), was listed by
USFWS as threatened under the Endangered Species Act on December 11, 2014, and is also
protected under the MBTA. There is no critical habitat designated for the rufa red knot; however,
this species may occur within the Project Area. According to the e-Bird database, there were
1200 rufa red knots observed in Collier County in 2014, including observations on Tigertail
Beach County Park, Sand Dollar Island, and in Big Marco Pass (e-Bird, 2015b).
Due to the recent listing of the rufa red knot, no programmatic Biological Opinion has been
prepared for this species. It is likely that the conservations measures described above for the
piping plover would be the same as, or similar to, the conditions required to minimize impacts to
the rufa red knot.
7.2 Shorebirds
The Project Area and adjacent areas provide habitat to a range of shorebirds including black
skimmers (Rhynchops niger), Wilson's plovers (Charadrius wilsonia), least terns (Sterna
antillarum), and snowy plovers (Charadrius alexandrines). Although nesting was not observed
by these species during surveys conducted in 2008 by Passarella and Associates (USFWS, 2009),
the Project Area and surrounding areas serve as foraging and loafing habitat for shorebirds and
could potentially be suitable for nesting. All of the above mentioned species are protected under
the MBTA. Shorebird monitoring surveys and restrictions on equipment placement (e.g.
establishing buffer zones and travel corridors) would likely be required to minimize impacts to
shorebirds in the Project Area.
7.3 Rookery Bay National Estuarine Research Reserve (RBNERR)
The Rookery Bay National Estuarine Research Reserve (RBNERR), located at the northern end
of the Ten Thousand Islands on the Gulf coast and comprising the western extent of the
Everglades ecosystem, encompasses 110,000 acres of subtropical mangrove-forested estuary in
Collier County. Over half of the reserve (64%) is open water and the remaining consists of
mangroves, fresh to brackish water marshes, and upland habitats. Big Marco Pass forms the
western boundary of the RBNERR and Marco Point, which borders the western edge of Collier
Creek and the southern edge of Hideaway Beach, is also within the reserve boundaries. The
Florida Department of Environmental Protection (FDEP) has designated all tidally connected
waters within the boundaries of the RBNERR and Cape Romano/Ten Thousand Islands Aquatic
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Preserves as Class II and Outstanding Florida Waters (OFW). Designation as an OFW requires
that permitted projects conform to higher water quality standards, which will be assessed through
permit required turbidity monitoring during project construction.
7.4 Seagrass
Seagrass resources have been documented offshore of Hideaway Beach (approximately between
H-2 and H-4) during surveys conducted in 2005 and 2008 as part of the 2005 and 2010
Hideaway Beach Nourishment Projects. Since this seagrass fell within the mixing zone, a
seagrass monitoring plan was implemented to document natural and/or project related changes in
the seagrass beds for both 2005 and 2010 projects. Results of monitoring showed no project
impacts. A compilation of statewide seagrass data also confirms seagrass resources are present
within Collier Bay (FWC and FWRI, 2011).
7.5 Mangroves
Mangroves are located along the west bank of Collier Creek. As part of the Hideaway Beach
Nourishment and Groins Project (FDEP Permit No. 0309260-001-JC, issued Dec. 12, 2012), a
monitoring plan was required to detect any potential impacts to the mangroves resulting from
relocation of the rock jetty at the entrance to Collier Creek. Mangrove resources are located
adjacent to Hideaway Beach on Marco Point as well as south of Hideaway Beach along Tigertail
Beach County Park (SFWMD, 2011). Previous mitigation was required to offset potential
impacts to 0.51 acres of mangrove habitat associated with fill placement from the Hideaway
Beach Erosion Control Project (FDEP Permit No. 0222764-001-JC, issued Jan. 7, 2005). The
impact site was located just south of H-1, in the vicinity of the southernmost groins at South
Point, and the mitigation site was located within the RBNERR near Shell Island Road North.
8.0 ALTERNATIVES DEVELOPMENT
There are a number of features that can be used to improve conditions in Collier Creek, and
secondarily on the adjacent Hideaway Beach. These types of conditions deal with the flow of the
Creek between Collier Bay and Marco River and the beach erosion found updrift of the terminal
groin. The conditions in the Creek relate to the high currents, turbulence, poor navigability and
scour caused by present flow conditions.
The high current, turbulence and poor navigability appear to be caused by the tapering
(narrowing) of the Creek at its entrance to Marco River. A secondary cause may be the effect of
the fingers piers and observation platform on the flow.
Between the teiminal jetty and the first T-groin west of Collier Creek (near H-14), there is
ongoing beach erosion. This erosion alternates with periods of excess sand, likely related to
recent beach nourishment projects on Hideaway Beach. As a previous corrective measure, a
terminal jetty was built in 2005 to partially stabilize the beach. Periods of excess sand are
characterized by sand overtopping and enveloping the terminal jetty on the way to deposition in
the Creek. Lately this has produced a pronounced bypass bar that is impeding navigation and
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smooth flow conditions in Collier Creek. Even with the terminal jetty, there are still periods
when North Hideaway Beach is overly eroded, east of the last T-groin.
These conditions could be improved with the features listed below. These alternatives are meant
to be selectively combined to develop a workable solution to the main problems in the Creek and
to maintain or improve the stability of the beach to the west as a secondary objective. The
selected choices must not only be feasible engineering alternatives but also must be acceptable to
the permit agencies, be cost effective and meet the objectives of the stakeholders. In order to
assess the feasibility of addressing the flow and navigation issues at the entrance to Collier
Creek, seven alternatives were considered. The alternatives include:
1. Enlarge Entrance Channel to Equilibrium Cross Section
2. Move Terminal Jetty West
3. Remove Terminal Jetty
4. Adjust the Terminal Jetty
5. Modify Dredging Practices
6. Coastal Structures to Realign and Streamline the Creek Further to the West
7. Constrain the Flow in Collier Creek
The alternatives are described below.
1. Enlarge Entrance Channel to Equilibrium Cross Section. The high currents, turbulence,
poor navigability and scour indicate that the channel is too narrow at its entrance to
Marco River. This is supported by that fact that these conditions appear to be worse at the
peak tidal range. Every inlet has an equilibrium cross section based upon the local tidal
prism and coastal engineering principals; it appears that the equilibrium cross section for
Collier Creek is larger than the present condition at the Creek entrance. The equilibrium
.cross section is desirable for effective channel flow and for maintaining the inlet opening.
The equilibrium cross section is best positioned within the sandy reaches of a channel
where it is not overly constrained by hardened structures, which limit the channel's
ability to expand and contract with monthly tidal variability and weather. When re-
designing the channel at Collier Creek, the equilibrium cross section should be positioned
between the end of the structures at VDMW (finger piers and observation deck) and the
terminal jetty.
2. Move Terminal Jetty West. Establishing the equilibrium cross section between Ville de
Marco and the terminal jetty may not be possible with the present location of the terminal
jetty. The jetty may need to be moved further west in order to create sufficient space to
allow for a relatively unconstrained flow between the Ville de Marco seawall and the
terminal jetty. The movement of the groin will require permit approval and permission
from the upland landowner. Within the 2012 Hideaway Beach permit, a jetty relocation
was proposed but has not yet been constructed (Figure 8). The terminal jetty sits
predominantly on newly accreted State Lands that were underwater at the time of the last
parcel designations. The use of a steel sheet pile jetty, moved to the western edge of the
easement may be the most easily permittable solution.
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3. Remove Terminal Jetty. If it's not possible to move the terminal jetty sufficiently west,
based on either permit or land use restrictions, removal of the structure should be
considered. Historic photographs (Appendix B) show that before the terminal jetty was
constructed, Collier Creek was wider and able to migrate more freely. The photographs
also suggest that without the jetty, a larger cross sectional area can be achieved, which
would allow for smoother, slower flow. Although removing the jetty may improve the
flow conditions in the Creek, it may negatively affect the stability of the beach between
the Creek entrance and the first T-groin (at H-14) as well as result in additional sand to be
dredged out of Collier Creek during maintenance events.
4. Adjust the Terminal Jetty. The terminal jetty was constructed to control sand losses from
Hideaway Beach. Historic aerials reveal that at times the terminal jetty is completely
buried with sand and sand flows around the tip of the groin into Collier Creek and the ebb
shoal. Adjusting the terminal jetty to be taller, longer and sand tight would allow the
structure to better hold sand updrift, slowing the infilling rate at Collier Creek and
improving the erosion conditions on North Hideaway Beach between the last T-groin and
the jetty.
5. Modify Dredging Practices. Dredging of Collier Creek primarily relieves infilling of the
Creek and secondarily provides sand for nourishing Hideaway Beach. During the last
dredging event (2012), sand was placed on North Beach between H-12 and H-14. It
appears that the sand moved quickly back to the jetty, overtopped and enveloped it and is
infilling the Creek, creating a bypassing bar.
Maintenance dredging of the Creek should continue, but disposal of the dredged sand can
be improved to reduce the frequency of maintenance dredging as well as provide
additional sand to Hideaway Beach. Sand could be disposed of further updrift on
Hideaway Beach, within the T-groin field. The nearshore borrow area could be used as a
temporary holding area (stockpile) to be used in future nourishments. By moving the
disposal area further west it would take longer for coastal processes to transport the
material back to the terminal jetty. In addition, dredging the area immediately west of the
terminal jetty would create a sand trap that would further delay the need for maintenance
dredging at the entrance to Collier Creek.
6. Coastal Structures to Realign and Streamline the Creek Further to the West. Visual
observations and historic profiles indicate that the flow tends to hug the east side of the
entrance, near the VDMW observation deck and first finger piers. If this is the hydraulic
tendency of the flow, then widening the channel may not totally alleviate the excessive
turbulence and high currents being experienced near the observation deck and the first
few finger piers of VDMW. Groins, breakwaters and even panels between the finger
piers could be strategically placed to provide a means of guiding the flow away from
VDMW towards the center of the Creek. This may address one of the possible causes of
the unsteady flow conditions and scouring of the seawall.
7. Constrain the Flow in Collier Creek. In theory, reducing the effective cross sectional area
of the Creek would reduce the flow possible between Collier Bay and the Marco River.
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Reducing flow would lead to infilling and smaller cross sectional areas throughout the
Creek. This may reduce the unstable conditions that create turbulence and high currents
without having to make changes to the existing structures (terminal jetty or finger piers).
This method is primarily theoretical and its implementation would have to be considered
experimental.
9.0 GOVERNMENT PROCESS
Collier Creek, located in Marco Island, within Collier County has many stakeholders and the
costs of addressing the issues in the Creek will be a shared responsibility amongst government
parties. Depending on the type of solution employed, various cost sharing scenarios will arise.
Although this will be ultimately negotiated through government processes, this feasibility
analysis presents points to consider for implementation of the various alternatives. The selected
solution must not only contain feasible engineering alternatives but also must be acceptable to
the permit agencies, minimize environmental impacts, be cost effective and meet the objectives
of the stakeholders.
Presented here is a cursory summary of potential cost-sharing partners:
a. Federal: The Federal government funds small navigation projects, but it is unlikely
that Collier Creek could be funded. Recent U.S. Army Corps of Engineers policy has
been to avoid funding small navigation projects and not to start any new projects.
b. State Funding: The FDEP (State) is a source of funds for beach and inlet projects.
Funding of these projects is based on a ranked scoring system that favors public
access, project size and other factors that are unfavorable to Collier Creek. The
chance of using the established beach program as a State funding source is not
probable.
c. State Lands: The area between the terminal jetty and the first T-Groin (near H- 14) is
State Lands according to the County Property Appraiser's parcel data (Figure 1). Use
of the state lands' parcel is needed for full implementation of several alternatives and
may have to be negotiated. CEC's proposed jetty relocation appears to have been
approved in the 2012 Hideaway Beach FDEP permit, but may have been rejected for
construction by the State Lands Department.
d. Collier County: The County funds beach and inlet projects using Tourist
Development Category "A" Funding, based on a policy approved on November 1,
2005 by the Board of County Commissioners. Two paragraphs of this policy apply to
Collier Creek: Inlet Sand Bypassing and Shore Protection Structures. To qualify, the
project would have to meet the criteria described below and be approved by a grant
application review process.
Excerpt from 'Tourist Development Category "A" Funding Policy":
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Inlet Sand Bypassing. The bypassing of sand across inlets may be funded by Tourist
Development Tax Category "A" funding provided the Inlet Management Plan
recommends the bypassing, the dredging of the pass or inlet is recommended by the
Coastal Advisory Committee, meets the inlet funding policy criteria and is approved
by the Board of County Commissioners as being in the in the public interest. No TDC
Category "A"funding will be approved for dredging non-beach compatible material
except when encountered during an approved realignment or modification to an
existing approved pass/inlet dredging project and then only when recommended by
the Coastal Advisory Committee, Tourist Development Council and approved by the
Board of County Commissioners as being in the public interest.
Shore protection structures and project sponsorship. Projects, including construction
and maintenance of shore protection structures (groins, jetties, breakwaters, etc.),
may be funded by Category "A"funding for eligible beaches. However, 'ownership'
responsibilities must rest with an entity other than "Tourist Development Taxes" —
i.e. there must be a project sponsor (private interests, taxing districts, municipalities
or County Departments other than those funded with Tourist Development Taxes).
e. Local Funding: The process for funding from the City of Marco Island and local
property owners is up to the rules of the local government. At a minimum, the project
may require a local sponsor and perhaps local financial contribution.
10.0. RECOMMENDATIONS
Based on the review of the coastal morphology of the Collier Creek and Hideaway Beach,
historic aerials, site visits, stakeholder meetings and the current conditions measured during the
field investigation, several findings have been identified. The overall study findings are
summarized as follows:
1. The entrance to Collier Creek has narrowed since 2005, when the terminal jetty was
installed.
2. Infilling is occurring in Collier Creek.
3. Collier Creek experiences turbulent flow and strong currents around peak tides.
4. Too much sand is being transported to the Creek, shortening the time between
dredging events and causing further constriction of the inlet's width.
5. If the jetty cannot be moved west, removal may be the best alternative.
It is probable that a combination of the engineering alternative presented above, will provide the
best results for this area. Based on the engineering analysis conducted for this feasibility study, it
is recommended that the entrance to Collier Creek be widened 20 to 60 feet depending on
location and that sand management practices be changed to reduce the amount of sand arriving at
the terminal jetty and entering the Creek. Widening of Collier Creek would be accomplished by
relocating the terminal jetty further west; if the State Lands Department objects to the relocation
of the terminal jetty, removal may accomplish the same goal. Reducing the jetty's width by using
sheet pile construction may gain additional width for the Creek entrance. Material from
maintenance dredging events should be placed further updrift of the terminal jetty to increase the
amount of time that it takes for the sand to be transported back to the Creek entrance.
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Improvements to the jetty structure can be implemented to make it more sand tight and further
delay sand transport into the Creek.
Prior to adjusting the terminal jetty, a numerical modeling study is recommended. The modeling
effort will be able to provide additional assurances in the chosen structural and sediment
management modifications,prior to construction.
The County should request a meeting with State Lands and the FDEP to explore the options
available.
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11.0 REFERENCES
Collier County Coastal Advisory Committee, 2014. Tourist Development Category "A" Funding
Policy, approved by the Board of County Commissioners 11-1-05.
Coastal Engineering Consultants, Inc., 2011. Collier Bay Entrance Channel Emergency
Dredging, Coastal Systems Assessment.
Coastal Engineering Consultants, Inc., 2014. Hideaway Beach Erosion Control Project — Phase
III, 2014 First Annual Monitoring Report.
Coastal Planning & Engineering, 2010. Hideaway Beach Nourishment Project, Four Year Post-
Construction Monitoring Report.
GoogleEarth
NOAA http://tidesandcurrents.noaa.gov/
Collier County Official Records, 2005. Sovereign Submerged Lands Easement No. 30622 (5176-
11) BOT File No. 110222775 PA No. 0068737-002-JC.
Collier County Parks and Recreation Department (CCPRD). 2014. Collier County Sea Turtle
Protection Plan Annual Report—2013. Prepared by. Principal Investigators: Kraus, M.C., M. K.
Toro and M. Hennig. Naples, Florida. January 2014.
e-Bird. 2015a. eBird: An online database of bird distribution and abundance: piping plover [web
application]. eBird, Ithaca, New York. Online at: http://www.ebird.org. Last accessed: January 6,
2015.
e-Bird. 2015b. eBird: An online database of bird distribution and abundance: red knot [web
application]. eBird, Ithaca, New York. Online at: http://www.ebird.org. Last accessed: January 6,
2015.
Florida Department of Environmental Protection, 2005. Hideaway Beach T-Groins Project.
Permit No. 0222764-001-JC.
Florida Fish and Wildlife Conservation Commission (FWC). 2011. Standard manatee conditions
for in-water work. Florida Fish and Wildlife Conservation Commission, Tallahassee, FL. 2 p.
Florida Fish and Wildlife Conservation Commission (FWC). 2013. Florida statewide nesting
beach survey data — 2013 season. Online at: http://myfwc.com/research/wildlife/sea_
turtles/nesting/statewide/. Last accessed: June 4, 2014.
Florida Fish and Wildlife Conservation Commission (FWC) and Fish and Wildlife Research
Institute (FWRI). 2008. Collier County Aerial Distribution Survey for Manatees (May 2006 to
26
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June 2008). Geospatial Data. Online at: http://ocean.floridamarine.org/mrgis/. Last accessed:
January 8, 2015.
Florida Fish and Wildlife Conservation Commission (FWC) and Fish and Wildlife Research
Institute (FWRI). 2011. Seagrass Florida. Geospatial Data. Online at: http://research.myfwc.com.
Last accessed: January 8, 2015.
National Marine Fisheries Service (NMFS). 2003. Gulf of Mexico Regional Biological
Opinion (GOM RBO) on Hopper Dredging of Navigation Channels and Borrow Areas in
the U.S. Gulf of Mexico. NOAA Fisheries, Southeast Regional Office, St. Petersburg,
Florida. Issued November 19, 2003. 121 pp.
National Marine Fisheries Service (NMFS). 2006. Sea turtle and smalltooth sawfish construction
conditions. National Marine Fisheries Service (NMFS), U.S. Department of Commerce. 1 p.
National Sawfish Encounter Database (NSED). 2014. Sawfish encounters in Florida counties,
May 2010 to May 2011. http://www.flmnh.ufl.edu/fi sh/sharks/sawfi sh/regional4.html. Last
accessed: January 26, 2015.
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CB&I COASTAL PLANNING&ENGINEERING, INC.
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WORK ORDER/PURCHASE ORDER
Contract 13-6164-CZ;;Professional Services:Architect&Engineering"
Contract Expiration Date:March 8,2019
This Work Order is for professional Engineering services for work known as: Collier Creek Interim
Dredge Analysis&Design.
Project Name: Collier Creek '''
Project No: 195-90064 ✓
The work is specified in the proposal dated March 10, 2015 which is attached hereto and made a part
of this Work Order. In accordance with Terms and Conditions of the Agreement referenced above,
this Work Order/Purchase Order is assigned to: CB&I Coastal Planning& Engineering,Inc. (CB&I).
Scope of Work: As detailed in the attached proposal and the following:
* Task I Dredge Design "
* Task II Minor Permit Mod&Agency Coordination V
* Task III Construction Plans&Specifications
* Task IV Bidding Assistance V'
* Task V Engineer of Record ,,r
Schedule of Work: Complete work within I'days from the date of the Notice to Proceed which is
accompanying this Work Order. The Consultant agrees that any Work Order that extends beyond the
expiration date of Agreement No. 13-6164-CZ,ill survive and remain subject to the terms and
conditions of that Agreement until the completion or termination of this Work Order.
Compensation: In accordance with the Agreement referenced above, the County will compensate the
Firm in accordance with following method(s): (Negotiated Lump Sum (NLS) CLump Sum Plus
Reimbursable Costs (LS-+-RC) Tire& Material (T&M) (established hourly rate— Schedule rl C
Cost Plus Fixed Fee (CPFF), (define which method will be used for which tasks) as provided in the
attached proposal.
Task 1 S 1 0,748.00 ',
Task II $16,783.70 ",
Task III $13,664.00 ,''
Task IV $ 3,375.70
Task V $24,274.50 .
TOTAL FEE $68,845.90(T&M) ✓
PREPARED BY: ,J9/11 Pi -" I /
C ' 1 McA in, CZM M ger Date
g
APPROVED BY: .. a1U Jf1
Amy Pa erson, Division Director Date
Page I of 2
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Casalanguidveire nt Head Date
By the signature below, the Firm (including employees, officers and/or agents) certifies, and hereby
discloses,that, to the best of their knowledge and belief,all relevant facts concerning past,present,or
currently planned interest or activity (financial, contractual, organizational, or otherwise) which
relates to the proposed work; and bear on whether the Firm has a potential conflict have been fully
disclosed.
Additionally, the Firm agrees to notify the Procurement Director, in writing within 48 hours of
learning of any actual or potential conflict of interest that arises during the Work Order and/or project
duration.
ACCEPTED BY: CB&I Coastal Planning& Engineering, Inc.
3/11 la°ir
Thomas P. Pierro, P.E., D.CE. Director Date
Page 2 of 2
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, ,; CB&I Coastal Planning&Engineering, Inc.
2481 NW Boca Raton Blvd.
Boca Raton,FL 33431
Tel:+1 561 391 8102
Fax:+1 561 391 9116
www.CBLcom
March 10, 2015
Gary McAlpin, Director
Collier County Coastal Zone Management
2800 N. Horseshoe Drive
Naples, FL 34104
Re: Collier Creek Interim Dredge Analysis & Design, Agency Coordination, Construction
Plans& Specifications, Bid Assistance, and Construction Services
(Contract No. 13-6164-CZ,tProfessional Services: Architect and Engineering")
Dear Gary:
This letter is in response to Collier County's request for a proposal for CB&I Coastal Planning &
Engineering, Inc. (CB&I) to perform staff engineering tasks under'the above referenced contract, to
support the County prepare and construct the interim dredging of Collier Creek. CB&I will conduct a
dredge analysis to determine dredge and disposal areas, coordinate with agencies for permitting of the
proposed dredging, produce construction plans and technical specifications, coordinate with FDEP for a
Notice to Proceed, provide bidding assistance to the County, and serve as the engineer of record to
certify this project. A detailed scope of work is attached in Exhibit A.
A fee proposal is included as Exhibit B, and the rate schedule is provided as Exhibit C. The cost with
time and materials is not to exceed $68,845.90. le'
Barring any unforeseen circumstances, all work will be completed within 270 days of receiving the
Notice to Proceed.
Very trul yours,
Thomas P. Pierro, P.E., D.CE.
Director
CB&I Coastal Planning & Engineering, Inc.
cc: Gail Hambright, Collier County Government
Tara Brenner, P.G„ CB&I
Stephen Keehn, P.E., CB&i
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Exhibit A
Scope of Work
.......... ...... .
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Collier Creek: Interim Dredge D ' Agency Coordination,Construction Plans &
Specifications,Bidding Assistance and Construction Services
Collier County, Florida
Scope of Work
Contract Number 13-6164
Introduction
To address the current conditions in Collier Creek, the County wishes to conduct an interim
dredging project in 2015. CB&I Couotd Planning & Engineering Inc. (CB&I) will provide the
engineering services described below as required to obtain a notice to proceed from Florida
Department of Environmental Protection (FDEP), permission from the United States Army
Corps of Engineers (USACE)and conduct interim dredging of Collier Creek.
This proposal contains the tasks necessary to bring the project bhrougb construction. CB&.l will
consult with FDEP and USACE to determine a project moopeaodnequiredpennitdng. CB6blwiU
support the County's inspection efforts before and during construction and will develop the post-
construction report and certification based largely on the surveys, reports and observation of the
contractor and the County during construction. This proposal assumes that no new permit
applications, nurvcys, field investigations, studies or modeling will be required.
1. Dredge Design
This interim dredging event is intended to be limited in scope to address hot spots within the
channel that cause turbulence and impede navigation. The December Z0l4 CB&I survey data
will be used as the pre-construction condition for design of the dredge areas. CB&1 engineers
will review the December 2014 conditions against the previously permitted dredge template to
identify areas requiring interim maintenance. The interim dredge area will be finalized through
consultation with the Coastal Zone Management Department to meet County objectives'. The
disposal area will be identified and delineated within permitted disposal areas. The objectives of
the interim dredge design will be to improve navigation as a temporary solution while the
comprehensive analysis of Collier Creek alternatives is being conducted and to utilize a disposal
location that will extend the pr ject life longer than the last dredge p jecL
Volume calculations will be completed to determine the quantity of sand to be dredged. A dredge
design and ucomplete set of design documents will be provided to the County for review. Upon
approval from thc County, CB&I- will incorporate this design into the construction documents.
Surveys are not included with this proposal: the interim design v/i|| he based on December 2014
surveys, and available monitoring or as-built surveys of Collier Creek or Hideaway B|cocb.
2. Minor Permit Mod & Agency Coordination
It is the County's desire to return the creek to 2005 conditions and dispose of the material in a
location that will maximize the time before mnfluling of the creek entrance occurs; tbionna)" not be
attainable under existing. permits. The construction area xili be limited to that described within
existing permits (MEP Permit No. 0309280-001-]C & 305112-001-]C) or requiring no more
than a minor permit modification. The intent is to obtain a notice to proceed quickly and avoid
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the need for a major permit modification or long permit review/approval process. We will
conduct a thorough review of-existing and recent permits and consult with FDEP and USACE
during the design phase of this work.
CB&I will work with the agencies (FDEP and USACE) to utilize existing permits to allow for
this interim dredging project. Based upon consultation with the agencies and the County, the
dredge and disposal areas will be determined. This phase will not exceed efforts of a minor
permit modification.
In support of acquiring a Notice to Proceed, CB&I will coordinate with FDEP and submit the
following information:
I. Construction plans and specifications.
2. Updated Sediment QA/QC and/or physical monitoring plans (as necessary)
3. Turbidity monitoring qualifications. The names and qualifications of individuals
performing water quality functions along with 24-hour contact information shall be
submitted for approval.
A copy of the plans and specifications will also be provided to the USACE in Fort Meyers,FL.
3, Construction Plans & Specifications
CB&I will prepare construction documents including construction plans' and specifications
necessary fur bidding the project. The construction plans will include plan views and cross-
sections sufficient for the construction of the interim dredging project. The disposal site xvill be
delineated within areas permitted by MEP and USACE permit conditions. The plans will be
based on the December 2014 survey.
Specifications developed for the project will include: Technical Specifications with
Environmental Protection Summary. We will integrate the QA/QC plan, turbidity standards. and
permit conditions into the work. It is assumed, that the sand samples collected during the
December 2014 field investigation are sufficient for the QA/QC process and that no new
samples will be required. The Engineer will provide plans and specifications in Acrobat and
Word format. The quantities will be based on the December 2014 survey.
4. Bidding Assistance
CB&I will assist the County in their lead of the bidding process. CB&I will attend the Pre-Bid
Meeting, and will prepare a basic addendum if needed. Once the bids have been opened. CB&I
will assist the County in reviewing the bids and provide a recommendation to the County based
on a review of the submitted bids.
5. Engineer of Record
As the engineer of record. CB&I will conduct pre-,during- and post-construction tasks necessary
for certification of the project. A CB&I engineer will attend the pre-construction conference.
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During construction, CB&l will support the County's inspection efforts and perform occasional
site visits to inspect the work. Based largely on surveys, daily reports and observations made by
the dredge contractor and County inspectors, CB&I will prepare a post-construction report and
certification to meet permit requirements.
Summary
This work will be performed on a time and materials (T&M) basis with a cost not to exceed
$68,845.90 as outlined in the attached fee spreadsheet. The work will be completed within 270
days of receipt of the Notice to Proceed.
Confidentiality Statement
The information contained in this proposal is confidential commercial information and shall not be disclosed, except
for evaluation purposes,provided that if a contract is awarded to CB&I Environmental& Infrastructure, Inc. as a
result of or in connection with the submission of this proposal, the requester shall have the right to use or disclose
the data to the extent provided in the contract. This restriction does not limit the requestor's right to use or disclose
any technical data obtained from another source without restriction.
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Exhibit B
Fee Proposal
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Exhibit C
Rate Schedule
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Exhibit C
SCHEDULE B: RATE SCHEDULE
Standard Hourly
Title Rate
Principal 206.00
Senior Project Manager 172.00
Pralect Manager 147.00
Senior Engineer 157.00
Engineer 12.3.00
Senior Inspector 96.00
Inspector 76.00
Senior Planner 139.00
Planner 110.00
Senior Designer 5 114.00
Designer 94.00
Environmental Specialist 109.00
Senior Environmental Specialist $ 134.00
Scientist/Geologist 93.00
Senior Scientist/Geologist $ 118.00
Marine Biologist/Hydrogeologist 5 110.00
Senior Marine Biologist/Hydrogeologist 138.00
Senior GIS Specialist I $ 139.00
GIS Specialist $ 102.00
Clerical/Administrative 62.00
Senior Technician 85.00
Technician 5 72.00
Surveyor and Mapper $ 120.00
CADD Technician $ 81.00
Survey Crew-2 man 130.00
Survey Crew-3 man 161.00
Survey Crew-4 man 189.00
Senior Architect 154.00
Architect 121.00
This list is not intended to be all inclusive. Hourly rates for other categories of
professional, support and other services shall be mutually negotiated by Collier County
and firm on a project by project basis as needed.
B-1
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