Agenda 11/12/2024 Item #16F12 (Authorize the expenditury of Touist Development Tax (TDC) funds for the Clam Pass Maintenance Dredging Project in the to Reimbursethe Pelican Bay Services Division for construction)11/12/2024
Item # 16.F.12
ID# 2024-1718
Executive Summary
Recommendation to authorize the expenditure of Tourist Development Tax (TDC) funds for the Clam Pass Maintenance
Dredging project in the amount of $218,876.64 to reimburse the Pelican Bay Services Division for construction and
associated engineering, surveying, monitoring and reporting that was paid in advance by Pelican Bay Services Division,
recognize reimbursement revenue within Pelican Bay Irrigation & Landscape Capital Fund (3041), authorize the
necessary Budget Amendments, and make a finding that this item promotes tourism.
OBJECTIVE: To receive reimbursement of $218,876.64 of expenses paid in advance by Pelican Bay Services Division
for urgent mechanical dredging project to prevent Clam Pass from closing in June 2024.
CONSIDERATIONS: Collier County Ordinance No. 2002-27, as amended, established the Pelican Bay Municipal
Service Taxing and Benefit Unit for the purpose of providing street lighting, water management, beach renourishment,
ambient noise management, extraordinary law enforcement service and beautification, including but not limited to
beautification of recreation facilities, sidewalk, street and median areas, identification markers, and maintenance of
conservation or preserve areas. Pelican Bay Services Division (PBSD) is solely responsible for advising the County on
dredging and maintaining Clam Pass and manages such activities for the County.
Clam Pass is a small tidal inlet in Collier County and the only tidal connection to the Clam Bay Natural Resource
Protection Area (NRPA) where over 500 acres of mangrove forest and other natural resources rely on the tidal exchange
from Clam Pass. Maintenance hydraulic dredging was scheduled for November 2024 following the turtle nesting season,
however recent conditions indicated significant shoaling at the inlet mouth including a growing sandspit across the inlet
entrance threating inlet closure. Tidal flow measurements indicated a sharp decline of the tidal flow over the month
May. The tidal range in the Bay was below 40% of the Gulf tide, where the critical threshold is between 60% to 50%.
Sand accumulation at the south bank of the inlet in the early months of 2024 created progressive channel migration
northward, and spit growth across the inlet entrance threatening inlet closure. Due to the dredging guidelines indicated
in the Clam Bay Natural Resource Protection Area Management Plan, by the time the tidal range was below the critical
threshold, there was not enough time to seek prior authorization for the expenditure of tourist development tax funds.
To prevent the inlet from closing and to restore tidal flow, the Pelican Bay Services Division Board agreed to fund the
full cost of the project and request reimbursement from the Tourist Development Council and Board of County
Commissioners after the project was complete. Staff requested proposals from County retained engineers, Humiston
and Moore Engineers in the amount of $33,085.00 to provide coastal engineering and surveying services, and Earth
Tech Environmental in the amount of $21,800.00 to provide environmental monitoring and reporting services required
by the Division’s Army Corp of Engineers Permit No. SAJ-1996-02789 (SP-BEM) and Florida Department of
Environmental Protection Permit No. 0296087-001-JC.
On May 22, 2024, staff requested quotes from pre-qualified vendors under Contract 21-7885 “Beach Maintenance
Related Activities” to perform limited urgent mechanical dredging of Clam Pass. Two quotes were received and opened
by staff on May 28, 2024 and are summarized below.
VENDOR QUOTE
Earth Tech Enterprises,
Inc.
$ 145,000.00
Kelly Brothers, Inc. $ 863,000.19
TSI Disaster Recovery,
Inc.
No response
The lowest responsive and responsible quoter was Earth Tech Enterprises for $145,000.00. A Purchase Order and
Notice To Proceed was issued to Earth Tech Enterprises to start mobilization on June 14, 2024. Since the proposed
activities were conducted during Sea Turtle Nesting Season, daily construction was coordinated with Collier County Sea
Turtle Protection Program staff. The work was substantially completed by June 29, 2024. The estimated volume of sand
excavated was 13,500 cubic yards. The cut and fill area was limited to the inlet channel and inlet banks on both sides of
the Pass to minimize the work area along the adjacent beach during Sea Turtle Nesting Season.
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11/12/2024
Item # 16.F.12
ID# 2024-1718
The inlet conditions preconstruction indicated poor hydraulic efficiency with tidal ratios dropping to below 0.4 relative
to Gulf tide with over 15,000 cubic yards accumulated within the inlet dredging template. A post construction survey
was completed on July 3, 2024, and indicated restoration of the inlet to design conditions by dredging and grading over
13,500 cubic yards which represents 90% of the total shoaling volume within the dredging template. Inlet flow was
restored with the tide ratios exceeding 0.8 which is significantly above the critical threshold indicated in the Clam Bay
NRPA Management Plan.
Currently the inlet is restored to hydraulically stable conditions and the adjacent beaches are graded to design template.
There is insufficient shoaling within the template to warrant additional dredging in 2024. Continued monitoring of the
inlet and annual monitoring survey in December of 2024 is recommended to provide an update on inlet conditions.
Additional interim surveying was needed to assess dredging and fill areas during construction and a Change Order is
being processed to Humiston and Moore Engineers in the amount of $5,542.50 which increased the total cost of
engineering and surveying services from $33,085.00 to $38,627.50. Sand quantities dredged and graded were verified
by post-construction survey and a Change Order was issued to Earth Tech Enterprises in the amount of $14,438.00,
which increased the total cost for construction by 9.96% from $145,000.00 to $159,438.00.
Actual costs incurred are as follows:
Vendor Service Provided Amount
Humiston & Moore
Engineers
Coastal engineering and surveying $ 38,627.50
Earth Tech Environmental Environmental monitoring and
reporting
$ 20,811.14
Earth Tech Enterprises Construction $ 159,438.00
TOTAL $ 218,876.64
ADVISORY COMMITTEE RECOMMENDATION: On October 15, 2024, the Tourist Development Council voted
unanimously to recommend to the Board of County Commissioners to authorize expenditure of Tourist Development
Tax (TDC) funds for the Clam Pass Maintenance Dredging project in the amount of $218,876.64 to reimburse the
Pelican Bay Services Division for construction and associated engineering, surveying, monitoring and reporting that was
paid in advance by Pelican Bay Services Division, authorize the necessary budget amendments, and make a finding that
this item promotes tourism.
FISCAL IMPACT: The Tourist Development Beach Renourishment/Pass Maintenance Capital Fund (1105) budgets
for the dredging of Clam Pass. Funding of $218,876.64 is available within Fund 1105, Clam Pass Project 88032. A
budget amendment is required to recognize and appropriate reimbursement revenue of $218,876.64 in Pelican Bay
Irrigation & Landscape Capital Fund (3041), Beach Renourishment Project 50126.
GROWTH MANAGEMENT IMPACT:
LEGAL CONSIDERATIONS: This item is approved as to form and legality and requires majority vote for approval. –
CMG
RECOMMENDATIONS: To authorize the expenditure of Tourist Development Tax funds for the Clam Pass
Maintenance Dredging project in the amount of $218,876.64 to reimburse the Pelican Bay Services Division for
construction and associated engineering and environmental monitoring and reporting, recognize reimbursement within
Pelican Bay Irrigation & Landscape Capital Fund (3041), authorize the necessary Budget Amendments, and make a
finding that this item promotes tourism.
PREPARED BY:
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11/12/2024
Item # 16.F.12
ID# 2024-1718
ATTACHMENTS:
1. Clam Pass Project Expenses
2. Contract #21-7885 Earth Tech Enterprises Quote for Clam Pass Construction
3. Contract 21-7885 Kelly Brothers Quote for Clam Pass Construction
4. Contract 21-7885 Earth Tech Enterprises Purchase Order for Clam Pass Construction
5. Contract 21-7885 Earth Tech Enterprises Change Order #1 (Approved)
6. Contract #18-7432-EV Earth Tech Environmental Proposal for Clam Pass Monitoring & Reporting
7. Contract 18-7432-EV Earth Tech Environmental Purchase Order for Clam Pass Monitoring & Reporting
8. Contract 18-7432-CZ Humiston & Moore Engineers Change Order #1 (Approved)
9. Contract 18-7432-CZ Humiston and Moore Engineers Proposal for Clam Pass Engineering
10. Contract 18-7432-CZ Humiston and Moore Engineers Purchase Order for Clam Pass Engineering
11. Clam Pass Inlet Conditions Memorandum July 16, 2024 (Humiston & Moore Engineers)
12. TDC Reimbusement_Rec Revenue
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Pelican Bay Services Division
801 Laurel Oak Dr, Ste 102, Naples, FL 34108
Collier County Board of County Commissioners
3299 Tamimi Trail East
Naples, FL 34112
Clam Pass Excavation and Dredging payables June-July 2024
Date Vendor PO Amount Paid
7.9.2024 Earth Tech Environmental Inc 4500231847 $ 20,811.14
9.9.2024 Earth Tech Enterprises Inc 4500231711 $159,438.00
9.23.2024 Humiston & Moore Engineers 4500231864 $ 38,627.50
Total $218,876.64
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Purchase Order number must appear on all related
correspondence, shipping papers and invoices:
Printed 09/03/2024 @ 16:06:49 Page 1 of 13041000000-183825-634999-50126.6
Collier County Board of County Commissioners
Procurement Services Division
Phone: 239-252-8407
Fax: 239-732-0844
Tax Exempt: 85-8015966531C-1
Collier County Board of County Commissioners
Attn: Accounts Payable
3299 Tamiami Trl E Ste 700
Naples FL 34112-5749
OR email to: bccapclerk@collierclerk.com
Send all Invoices to:
VENDOR Terms and Conditions
The VENDOR agrees to comply with all Purchase Order Terms and Conditions as outlined on the Collier County Procurement Services Division site:
https://www.colliercountyfl.gov/home/showdocument?id=104405, including delivery and payment terms. Further, the VENDOR agrees to:
1. Provide goods and services outlined in this Purchase Order with the prices, terms, delivery method and specifications listed above.
2. Notify department immediately if order fulfillment cannot occur as specified.
3. Send all invoices to:Collier County Board of County Commissioners
Attn: Accounts Payable
3299 Tamiami Trl E Ste 700
Naples FL 34112-5749
OR email to: bccapclerk@collierclerk.com
The Purchase Order is authorized under direction of Collier County Board of County Commissioners by:
Sandra Srnka, Director, Procurement Services Division
Vendor # 125114
EARTH TECH ENTERPRISES INC
6180 FEDERAL COURT
FORT MYERS FL 33905
Purchase order
PO Number 4500231711 Date 05/31/2024
Contact Person Pelican Bay Div
Telephone 239-252-1355 Fax 239-252-1359
Please deliver to:
PELICAN BAY SERVICES DIVISION
6200 WATERGATE WY
NAPLES FL 34108
Delivery Date: 09/30/2024
Terms of Payment Net 28 days (20 business days)
Item Material Description Order Qty Unit Price Per Unit Net Value
00010 CON TASK 1 MOBILIZATION & DEMOBILIZATION 37,000 EA 1.00 37,000.00
*** Item partially delivered ***
00020 CON TASK 2 CHANNEL EXCAV & BEACH DISPOSE 31,722 EA 1.00 31,722.00
*** Item partially delivered ***
00030 CON TASK 3 CUT/FILL GRADING ALONG BANK 46,880 EA 1.00 46,880.00
*** Item partially delivered ***
00040 CON TASK 4 EXCAV OF INTER FLOOD SHOAL AR 43,836 EA 1.00 43,836.00
*** Item partially delivered ***
159,438.00Total net value excl. tax USD
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July 16, 2024
MEMORANDUM
To: Neil Dorrill
From: Mohamed Dabees
Re: Clam Pass Dredging/Maintenance
HM File 29-018
2024 Emergency maintenance of Clam Pass:
Clam Pass conditions required emergency mechanical dredging to reopen the pass in June 2024.
Sand accumulation at the south bank of the inlet in the early months of 2024 created
progressive channel migration northward, and spit growth across the inlet entrance that
threatens inlet closure. The 2024 emergency maintenance work included grading the inlet banks
and dredging of the permitted at inlet channel, Section A and part of the flood shoal template in
Section B. The approximate volume of sand excavated was approximately 13,500 cubic yards.
Work started on June 18, 2024, and was substantially completed by June 29, 2024. The cut and
fill area were limited to the inlet channel and inlet banks to minimize work area along the
adjacent beach during the sea turtle nesting season.
Pre and Post maintenance inlet conditions:
The inlet conditions preconstructions indicated poor hydraulic efficiency with tidal ratios
dropping to below 0.4 relative to Gulf tide preconstruction with over 15,000 cubic yards
accumulated within the inlet dredging template.
The attached exhibit shows pre and post construction conditions at Clam Pass. Post construction
survey was completed on July 3, 2024. Post 2024 inlet conditions indicate restoration of the inlet
to design conditions by dredging and grading over 13,500 cubic yards which represents 90% of
the total shoaling volume within the dredging template. inlet flow is restored with the tide ratios
exceeding 0.8 which is significantly above the critical threshold indicated in the Clam Bay
Management Plan.
Recommendations:
Currently the inlet is restored to hydraulically stable conditions and the adjacent beaches are
graded to design template. There is insufficient shoaling within the template to warrant
additional dredging in 2024. Continued monitoring of the inlet and annual monitoring survey in
December of 2024 is recommended to provide an update on inlet conditions.
5679 STRAND COURT NAPLES, FLORIDA 34110 FAX: 239 594 2025 PHONE: 239 594 2021
Page 4247 of 5419
Easting Northing Azimuth Effective
Distance
Measured
Volumetric Rate
(CY/FT)
Total
Volume
(CY)
Measured
Volumetric Rate
(CY/FT)
Total
Volume
(CY)
Measured
Volumetric Rate
(CY/FT)
Total Volume
(CY)
0+00 387,864.94 686,294.98 180 50.0 2.3 116.1 0.2 11.1 7.9 394.6
0+50 387,914.94 686,295.42 180 50.0 17.6 878.0 18.6 928.0 33.1 1657.3
1+00 387,964.94 686,295.87 180 50.0 17.2 861.7 13.3 663.0 13.9 697.3
1+50 388,014.94 686,296.32 180 50.0 14.9 743.4 8.4 419.5 4.8 242.0
2+00 388,064.94 686,296.77 180 50.0 13.6 679.1 10.5 524.3 0.8 39.3
2+50 388,114.94 686,297.22 180 50.0 3.1 152.5 3.2 160.0 0.5 26.7
3+00 388,164.94 686,297.67 180 45.0 3.2 145.2 0.5 22.7 0.5 24.0
3+30 388,194.94 686,297.94 180 32.3 3.6 117.4 0.5 16.0 0.3 10.8
3+64.5 388,229.44 686,298.25 180 42.3 6.4 272.0 0.6 23.6 ----
4+10 388,279.10 686,372.13 156 50.0 15.3 765.6
4+60 388,326.17 686,389.30 156 50.1 18.2 913.9
5+10 388,373.24 686,406.47 156 50.1 17.1 857.5
5+60 388,420.31 686,423.64 156 50.1 15.1 756.6
6+10 388,467.38 686,440.81 156 50.0 7.2 359.6
Section A 3,965
Section B 3,653
Total 7,619 2,768 3,092 13,479Section BVolume in Template South Grading Area Cut North Grading Area Cut
Clam Pass 2024 Dredge Quantity
Section APage 4248 of 5419
CLAM PASS FINAL QUANTITIES BROKEN DOWN BY BID TAB LINE ITEMS
CO#1 quote quantity CY
actual quantity
CY variance CY unit price quote amount
increase
/(decrease) line new line amount
item 1 mob/demob 1 1 0 $ 37,000 $ 37,000 -$ $ 37,000
item 2 Section A 4,000 3,965 -35 8$ 32,000$ (278)$ 31,722$
item 3 cut/fill grading 5,000 5,860 860 8$ 40,000$ 6,880$ 46,880$
item 4 section B 3,000 3,653 653 12$ 36,000$ 7,836$ 43,836$
12,000 13,478 14,438$ 159,438$ TOTAL
Page 4249 of 5419
AS-BUILT CERTIFICATION BY PROFESSIONAL ENGINEER
Submit this form and one set of as-built engineering drawings to the U.S. Army Corps of
Engineers, Enforcement Section, 1520 Royal Palm Square Boulevard Suite 310, Fort Myers,
Florida,33919. If you have questions regarding this requirement, please contact the Enforcement
Branch at 904-232-3131.
1. Department of the Army Permit Number: SAJ-1996-02789(SP-BEM)
2. Permittee Information:
Name: _____________________________________________
Address: _____________________________________________
_____________________________________________
3. Project Site Identification (physical location/address):
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
4. As-Built Certification: I hereby certify that the authorized work, including any mitigation required
by Special Conditions to the permit, has been accomplished in accordance with the Department of
the Army permit with any deviations noted below. This determination is based upon on-site
observation, scheduled, and conducted by me or by a project representative under my direct
supervision. I have enclosed one set of as-built engineering drawings.
________________________________ _______________________________________
Signature of Engineer Name (Please type)
________________________________ _______________________________________
(FL, PR, or VI) Reg. Number Company Name
________________________________ _____________________ ____________
City State ZIP
(Affix Seal)
_____________________ August 07, 2024 _________________________Date Telephone Number
Collier County
c/o Pelican Bay Services Division
801 Laurel Oak Drive Suite 302
Naples, Florida 34108
The project site is located in Clam Pass and the Gulf of Mexico,
Sections 8 and 9, Township 49 South, Range 25 East, City of Naples,Collier County, Florida.
Mohamed A. Dabees, PE., VP
Humiston & Moore Engineers
FL 34110
(239)-594-2021
FL, PE 58003
Naples
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FROM
Jeremy
Sterk
Earth
Tech
Environmental
10600 Jolea Avenue
Bonita Springs, FL 34135
www.eteflorida.com
PHONE
239-304-0030
FOR
Pelican
Bay
Services
Division
TO
Lisa Jacob
EMAIL
Lisa.Jacob@colliercountyfl.gov
ADDRESS
801 Laurel Oak Drive
Suite 302
Naples
FL 34108
COPY TO
Karin Herrmann
QUOTE NUMBER
2559
DATE
May 29, 2024
EXPIRY DATE
June 28, 2024 at 8:00 AM
ETE
Proposal
for
Environmental
Consulting
Services-2024
Clam
Pass
Maintenance
Dredging
Project:
Clam
Pass
Maintenance
Dredging
2024-
Full
Dredging
General consulting for the Clam Pass maintenance dredging activity. The duration of this work is 365 days under Contract 18-
7432 (Environmental Engineering).
Thank
you
for
the
opportunity.
Earth Tech Environmental, LLC (ETE) appreciates the opportunity to provide you with the following agreement for professional
environmental services.
Scope
of
Professional
Services:
ETE is proposing the following Scope of Services for this project:
Page 4255 of 5419
The Earth Tech staff was professional,
and knowledgeable. Environmental
monitors work with our crew
seamlessly. We look forward to the next
project with Earth Tech !
Earth Tech was great to work with! We
partnered on a seagrass monitoring
project in Bradenton Beach. Our crews
spent three days mapping and
collecting quadrat data. Jeremy and his
Very happy that I found and worked
with this firm. After being in DEP
application process for 6 months and
being nowhere. They created required
portfolio within a few weeks and ALL
Task
1:
Turbidity
Monitoring
Turbidity Monitoring Per FDEP Permit Requirements:
ETE will provide turbidity for the subject project as outlined in the approved FDEP permit. Monitoring
will be conducted 3 times a day, at least 4 hours apart during daylight hours, and at any other time that
there is a likelihood of an exceedance of the turbidity standard, during all dredging and sand placement
operations. During each sample event, background and compliance samples will be taken at the dredge
and fill sites. ETE will email datasheets and corresponding GIS maps to the client for FDEP required
weekly summaries. This task assumes 20 dredging days. Pricing includes utilization of ETE's boat and
other necessary equipment. Hourly rate as approved in the environmental engineering contract:
Environmental Specialist @ $109 per hour.
109.00
x 95
10,355.00
Task
2:
Shorebird
Monitoring
ETE will provide an FWC approved bird monitor to assist with minimization of impacts to birds at the
beach fill area. The monitor will survey the beach fill area each morning. Daily logs would be collated on
a weekly basis and provided to the contractor. Monitoring is required between April 1st and August
31st. This task will not be necessary if dredging is completed outside this timeframe.
This task assumes 20 days of dredging - shorebird monitoring must start 10 days prior to construction
with and estimated dredge time of 20 days. Days can be added or subtracted and would be billed
accordingly. Hourly rate as approved in the environmental engineering contract: Environmental
Specialist @ $109 per hour.
109.00
x 65
7,085.00
Task
3:
Meetings
&
Coordination
Environmental support and oversight includes attending meetings with Client, Engineers, Contractors,
and Agency Representatives as necessary. Environmental Specialist @ $109 per hour.
109.00
x 40
4,360.00
Total $21,800.00
We
appreciate
your
business!
Thank you for allowing Earth Tech Environmental LLC to provide you and your community with environmental services. This
proposal can be authorized by digitally signing below. You can also print a PDF version of this agreement, sign, and return a copy
to us.
Payment
Options:
ETE accepts cash, check, or credit cards for services. A 3.8 % convenience fee is added to all credit card transactions.
Reviews See all reviews
Page 4256 of 5419
by
Devon
Carlock crew were very knowledgeable and
thorough.…
by
Jeremy
Herget
was accepted be DEP without request
for…
by
Eugene
Kaplan
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Purchase Order number must appear on all related
correspondence, shipping papers and invoices:
Printed 09/03/2024 @ 15:43:11 Page 1 of 13041000000-183825-634999-50126.2
Collier County Board of County Commissioners
Procurement Services Division
Phone: 239-252-8407
Fax: 239-732-0844
Tax Exempt: 85-8015966531C-1
Collier County Board of County Commissioners
Attn: Accounts Payable
3299 Tamiami Trl E Ste 700
Naples FL 34112-5749
OR email to: bccapclerk@collierclerk.com
Send all Invoices to:
VENDOR Terms and Conditions
The VENDOR agrees to comply with all Purchase Order Terms and Conditions as outlined on the Collier County Procurement Services Division site:
https://www.colliercountyfl.gov/home/showdocument?id=104405, including delivery and payment terms. Further, the VENDOR agrees to:
1. Provide goods and services outlined in this Purchase Order with the prices, terms, delivery method and specifications listed above.
2. Notify department immediately if order fulfillment cannot occur as specified.
3. Send all invoices to:Collier County Board of County Commissioners
Attn: Accounts Payable
3299 Tamiami Trl E Ste 700
Naples FL 34112-5749
OR email to: bccapclerk@collierclerk.com
The Purchase Order is authorized under direction of Collier County Board of County Commissioners by:
Sandra Srnka, Director, Procurement Services Division
Vendor # 119142
EARTH TECH ENVIRONMENTAL LLC
10600 JOLEA AVENUE
BONITA SPRINGS FL 34135
Purchase order
PO Number 4500231847 Date 06/13/2024
Contact Person Pelican Bay Div
Telephone 239-252-1355 Fax 239-252-1359
Please deliver to:
PELICAN BAY SERVICES DIVISION
6200 WATERGATE WY
NAPLES FL 34108
Delivery Date:
Terms of Payment Net 28 days (20 business days)
Item Material Description Order Qty Unit Price Per Unit Net Value
00010 CON TASK 1 TURBIDITY MONITORING 9,374 EA 1.00 9,374.00
*** Item completely delivered ***
00020 CON TASK 2 SHOREBIRD MONITORING 7,085 EA 1.00 7,085.00
*** Item completely delivered ***
00030 CON TASK 3 MEETINGS & COORIDINATION 4,352.14 EA 1.00 4,352.14
*** Item completely delivered ***
20,811.14Total net value excl. tax USD
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Purchase Order number must appear on all related
correspondence, shipping papers and invoices:
Printed 10/01/2024 @ 10:39:50 Page 1 of 13041000000-183825-634999-50126.2
Collier County Board of County Commissioners
Procurement Services Division
Phone: 239-252-8407
Fax: 239-732-0844
Tax Exempt: 85-8015966531C-1
Collier County Board of County Commissioners
Attn: Accounts Payable
3299 Tamiami Trl E Ste 700
Naples FL 34112-5749
OR email to: bccapclerk@collierclerk.com
Send all Invoices to:
VENDOR Terms and Conditions
The VENDOR agrees to comply with all Purchase Order Terms and Conditions as outlined on the Collier County Procurement Services Division site:
https://www.colliercountyfl.gov/home/showdocument?id=104405, including delivery and payment terms. Further, the VENDOR agrees to:
1. Provide goods and services outlined in this Purchase Order with the prices, terms, delivery method and specifications listed above.
2. Notify department immediately if order fulfillment cannot occur as specified.
3. Send all invoices to:Collier County Board of County Commissioners
Attn: Accounts Payable
3299 Tamiami Trl E Ste 700
Naples FL 34112-5749
OR email to: bccapclerk@collierclerk.com
The Purchase Order is authorized under direction of Collier County Board of County Commissioners by:
Sandra Srnka, Director, Procurement Services Division
Vendor # 101492
HUMISTON & MOORE ENGINEERS PA
5679 STRAND CT
NAPLES FL 34110
Purchase order
PO Number 4500231864 Date 06/13/2024
Contact Person Pelican Bay Div
Telephone 239-252-1355 Fax 239-252-1359
Please deliver to:
PELICAN BAY SERVICES DIVISION
6200 WATERGATE WY
NAPLES FL 34108
Delivery Date:
Terms of Payment Net 28 days (20 business days)
Item Material Description Order Qty Unit Price Per Unit Net Value
00010 CON TASK 1 DATA ANALYSIS 3,184 EA 1.00 3,184.00
*** Item completely delivered ***
00020 CON TASK 2 BID PROCESS & MEETINGS 3,226 EA 1.00 3,226.00
*** Item completely delivered ***
00030 CON TASK 3 AGENCIES COORDINATION 3,390 EA 1.00 3,390.00
*** Item completely delivered ***
00040 CON TASK 4 FIELD OPS & POST CONSTR ITEMS 12,135 EA 1.00 12,135.00
*** Item completely delivered ***
00050 CON TASK 5 SURVEY WORK 16,692.5 EA 1.00 16,692.50
*** Item completely delivered ***
38,627.50Total net value excl. tax USD
Page 4281 of 5419
July 16, 2024
MEMORANDUM
To: Neil Dorrill
From: Mohamed Dabees
Re: Clam Pass Dredging/Maintenance
HM File 29-018
2024 Emergency maintenance of Clam Pass:
Clam Pass conditions required emergency mechanical dredging to reopen the pass in June 2024.
Sand accumulation at the south bank of the inlet in the early months of 2024 created
progressive channel migration northward, and spit growth across the inlet entrance that
threatens inlet closure. The 2024 emergency maintenance work included grading the inlet banks
and dredging of the permitted at inlet channel, Section A and part of the flood shoal template in
Section B. The approximate volume of sand excavated was approximately 13,500 cubic yards.
Work started on June 18, 2024, and was substantially completed by June 29, 2024. The cut and
fill area were limited to the inlet channel and inlet banks to minimize work area along the
adjacent beach during the sea turtle nesting season.
Pre and Post maintenance inlet conditions:
The inlet conditions preconstructions indicated poor hydraulic efficiency with tidal ratios
dropping to below 0.4 relative to Gulf tide preconstruction with over 15,000 cubic yards
accumulated within the inlet dredging template.
The attached exhibit shows pre and post construction conditions at Clam Pass. Post construction
survey was completed on July 3, 2024. Post 2024 inlet conditions indicate restoration of the inlet
to design conditions by dredging and grading over 13,500 cubic yards which represents 90% of
the total shoaling volume within the dredging template. inlet flow is restored with the tide ratios
exceeding 0.8 which is significantly above the critical threshold indicated in the Clam Bay
Management Plan.
Recommendations:
Currently the inlet is restored to hydraulically stable conditions and the adjacent beaches are
graded to design template. There is insufficient shoaling within the template to warrant
additional dredging in 2024. Continued monitoring of the inlet and annual monitoring survey in
December of 2024 is recommended to provide an update on inlet conditions.
5679 STRAND COURT NAPLES, FLORIDA 34110 FAX: 239 594 2025 PHONE: 239 594 2021
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