Agenda 12/01/2009 Item #10D
Agenda Item No. 10D
December 1. 2009
Page 1 of 41
~
EXECUTIVE SUMMARY
Recommendation to adopt a resolution authorizing the condemnation of those perpetual and
temporary easement interests necessary for the construction of stormwatcr improvements
known as the Royalwood/Whitaker Road phase of the Lely Area Stormwater Improvement
Projcct (LASIP). (Capital Improvemcnt E1cment No, 291, Projcct No. 51101), Estimatcd
fiscal impact: $380,000.
OBJECTIVE: To adopt a resolution authorizing the condemnation of those temporary and
perpetual easement interests necessary for the construction of the RoyalwoodlWhitaker Road phase
of the Lely Area Stormwater Improvement Project (LASIP) (Project No. 51101).
CONSIDERATIONS: The Board of County Commissioners has been advised through various
communications of the need for construction of this project, and has clearly stated its concern
relating to the extreme flooding issues during the rainy season in the East Naples area. Construction
of Phase lA of LASIP was completed during 2007, Royalwood Lake Interconnect Improvements
during 2008 and Phases IB North and I B South during the course of this year. The proposed
resolution relates only to the RoyalwoodlWhitaker Road phase of the project, and attached is a
vicinity map depicting the approximate location of the easements required for this phase. A
significant amount of time and effort has been spent on analyzing various considerations resulting
in LASIP's final alignment. This alignment is based on the natural overland flow of stormwater
working in concert with existing wetlands, as well as existing ditches and canals constructed many
- years ago, and the project deepens and widens existing facilities. Construction of the Royalwoodl
Whitaker Road phase of this project is scheduled to commence in the dry season of 2010/2011.
Project scheduling requires that authority be granted for the condemnation of nine parcels, so as to
ensure that construction is not delayed if these parcels are not acquired in a timely manner by
negotiation.
A technical memorandum is attached from John E. Ireland, P.E., a principal with the firm PBS&J,
the consultant engineering firm designing and permitting the project. Attached also is an extract
from Collier County's response to the South Florida Water Management District's Request for
Additional Information relating to Application No. 980828-1 for LASIP. By its review,
concurrence and approval of this Executive Summary, the back-up documentation, and the
proposed resolution, the Board will have determined that the legal descriptions, and the interest in
real property specified on each legal description attached to the resolution, represent the most
feasible location, and are necessary for the construction of the Royalwood/Whitaker Road phase of
the LASIP project.
FISCAL IMPACT: The estimated cost of condemnation of parcels required to construct this
phase of the LASIP project is $380,000. This includes not only the value of the easements, but also
the attorney and expert witness fees for which the county is responsible under Sections 73.091 and
73.092, F.S. Funding is available in the Stormwater Capital Fund 325.
.-'
GROWTH MANAGEMENT IMPACT: This recommendation is consistent with the County's
Growth Management Plan.
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Agenda Item NO.1 OD
December 1, 2009
Page 2 of 41
LEGAL CONSIDERATIONS:
This item is legally sufficient for Board action. - HF AC.
RECOMMENDATION: That the Board of County Commissioners of Collier County, Florida:
I. Adopt the attached Resolution;
2. Authorize its Chairman to execute same on behalf of the Board; and
3. Authorize any budget amendments that may be necessary to implement the collective will of
the Board as evidenced by the adoption of attached Resolution and the approval of this
Executive Summary.
Prepared by: Robert Bosch, ROW Coordinator, TECM
Attachments: (I) Condemnation Resolution with Exhibit "A"; (2) Vicinity Map; (3) Technical
Memorandum from John E. Ireland to Margaret Bishop; (4) Extract from Collier County's response
to the South Florida Water Management District's Request for Additional Information relating to
Application No. 980828- I for LASIP
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Agenda Item No. 10D
December 1, 2009
Page 3 of41
COLLIER COUNTY
BOARD OF COUNTY COMMISSIONERS
Item Number:
Item Summary:
100
Meeting Date:
Recommendation to adopt a resolut'lon authorizing the condemnation of those perpetual and
temporary easement interests necessary for the construction of stormwater improvements
known as the RoyalwoodlWhitaker Road phase of the Lely Area Stormwater Improvement
Project (LASIP). (Capital Improvement Element No. 291, Project No. 51101). Estimated fiscal
impact: $380,000. (Norman Feder, Transportation Services Administrator)
1211120099:00:00 AM
Prepared By
Robert Bosch Right Of Way Coordinator Date
Transportation Division Transportation Engineering &
Construction Management 11/5/2009 5:09:46 PM
Approved By
Gerald Kurtz Project Manager, Principal Date
Transportation Division Transportation Road Maintenance 11/10/20098:53 AM
Approved By
Norm E. Feder, Ale? Administrator. Transportation Date
_. Transportation Division Transportation Administration 11/10/200910:08 AM
Approved By
Caroline Soto Management/Budget Analyst Date
Transportation Division Transportation Administration 11110/200911:06 AM
Approved By
Margaret A. Bishop Project Manager, Senior Date
Transportation Division Transportation Road Maintenance 11/101200912:20 PM
Approved By
Heidi F. Ashton Section Chief/Land Use-Transportation Date
County Attorney County Attorney 11/10/20094:28 PM
Approved By
Kevin Hendricks Manager. Right of Way Date
Transportation Engineering &
Transportation Division Construction Management 11/121200912:43 PM
Approved By
Jeff Klatzkow County Attorney Date
11/17/20092:45 PM
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Approved By
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Agenda Item NO.1 OD
December 1. 2009
Page 4 of 41
Therese Stanley
Manager - Operations Support - Trans
Date
Transportation Division
Transportation Administration
11/18/20093:24 PM
Approved By
Pat Lehnhard
Executive Secretary
Date
Transportation Division
Transportation Administration
11/18/20093:27 PM
Approved By
OMS Coordinator
Date
County Attorney
County Attorney
11/19/20091:39 PM
Approved By
Susan Usher
ManagemenUBudget Analyst, Senior
Date
Office of Management &
Budget
Office of Management & Budget
11/19/20097:11 PM
Approved By
Mark Isackson
ManagemenUBudget Analyst, Senior
Date
Office of Management &
Budget
Office of Management & Budget
11/19/20097:15 PM
Approved By
Leo E. Ochs, Jr.
County Manager
Date
County Managers Office
County Managers Office
11/20/200911 :35 AM
Agenda Item No. 10D
December 1. 2009
Page 5 of 41
RESOLUTION NO. 2009-
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A RESOLUTION AUTHORIZING THE CONDEMNATION OF THOSE PERPETUAL AND
TEMPORARY EASEMENT INTERESTS NECESSARY FOR THE CONSTRUCTION OF
STORM WATER IMPROVEMENTS KNOWN AS THE ROYALWOOD/WHITAKER ROAD
PHASE OF THE LELY AREA STORM WATER IMPROVEMENT PROJECT LOCATED IN
EAST NAPLES (CAPITAL IMPROVEMENT ELEMENT NO. 291, PROJECT NO. 51101).
WHEREAS, the Board of County Commissioners desires to improve the treatment and
control of storm water in the East Naples Area in order to alleviate flooding; and
WHEREAS, the Lely Area Storm water Improvement Project consists of improvements to an
existing drainage system for an 11,100 acre (plus or minus) area located in East Naples, of which
Royalwood/Whitaker Road (hereinafter referred to as the "Project") is but one phase; and
WHEREAS, the Project includes the expansion of existing and construction of new ditches,
the installation of new surface water control structures (culverts), and the construction of
maintenance pathways along the ditches; and
WHEREAS, the Lely Area Storm water Improvement Project (CIE Project No. 291) is in
accordance with both the Capital Improvement Element and Drainage Sub-element of the Growth
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Management Plan; and
WHEREAS, the location for the construction of the proposed improvements has been fixed
by survey and is collectively represented by the legal descriptions comprising Exhibit "A"
attached hereto and incorporated herein; and
WHEREAS, after consideration of the availability of alternate routes and locations, the
comparative costs of Project alternatives, various impacts upon the environment, long range
planning options, and public safety considerations, the Board desires to exercise its right to
condemn the property for public purposes.
NOW. THEREFORE, BE IT RESOLVED BY THE BOARD OF COUNTY
COMMISSIONERS OF COLLIER COUNTY, FLORIDA. that it has been detcnnincd by tbe
Hoard that it is necessary and in the public's best interest to acquire the property described in
Exhibit "A" (the "Property") for the purpose of constructing the improvements proposed as part of
the Royalwood/Whitaker Road phasc ol"the Lely Area Stormwater Improvement Project located in
East Naples, and for providing access to the improvements, in order to protect the health, safety
and welfare orthe citizens of Collier County.
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Agenda Item NO.1 OD
December 1, 2009
Page 6 of 41
AND IT IS FURTHER RESOLVED that acquisition of the Property and construction upon
the Property is part of the County's long range planning effort to alleviate flooding in the Ea~t
Naples area.
AND IT IS FURTHER RESOLVED that the Board has reviewed the staff reports and heard
presentations concerning alternative locations for the Project, various impacts to the environment,
public safety and welfare considerations associated with the design and construction of the Project,
and the costs associated with the design, property rights acquisition, and construction of the
Project; and the Board finds that after consideration of these issues, the most feasible location for
construction of the proposed improvements is collectively represented by the legal descriptions
comprising Exhibit "An attached hereto and incorporated herein.
AND IT IS FURTHER RESOLVED that the real estate interests described in Exhibit "A"
attached hereto and incorporated herein are necessary for the construction of the
Royalwood/Whitaker Road phase of the Lcly Area Storm water Improvement Project.
AND IT IS FURTHER RESOLVED lhat all ofthe Property shall be put to public purposes.
AND IT IS FURTHER RESOLVED that the County staff is hereby authorized to
immediately acquire by gift, purchase or condemnation, in accordance with the provisions of
Chapters 73, 74 and 127, Florida Statutes, the real property interests more particularly described
in Exhibit "A", attached hereto and incorporated herein.
AND IT IS FURTHER RESOLVED that no mobile homes are located on the Property and
therefore it will not be necessary to remove any mobile homes from the Property to be acquired.
This Resolution, adopted on this _.____ day of
,2009, after motion,
second and majority vote.
ATTEST:
DWIGHT E. BROCK. Clerk
BOARD OF COUNTY COMMISSIONERS
OF COLLIER COUNTY, FLORIDA
By:
DONNA FIALA, Chairman
Approved as 10 form and
legal sufficiency:
CJo
Assistant County Attorney
Condemnation Resolution
Page 2
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Agenda Hem NO.1 OD
,2009
Page of 41
EXHIBIT "A"
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SOUTH 30 FEET OF PARCEL
LEGAL DESCRIPTION
(10' DRAINAGE ACCESS &: MAINTENANCE EASEMENT)
A PARCEL OF LAND LYING IN SECTION 17, TOWNSHIP 50 SOUTH. RANGE 26 fAST, COLLIER COUNTY, FLORIDA.
BEING MORE PARTICULARLY DESCRIBED AS FOLLOWS:
THE NORTH 10 rCET OF THE SOUTH 40 FEET OF THE EAST HALF OF THE EAST HALF or THE NORTHEAST
QUARTER OF THE NORTHEAST QUARl ER OF TH[ NORTHWEST OUARTER OF SAID SECTION 17.
CONTAINING 1664 SQUARE FEET, MORE OR LESS.
PMCELNO,I4-3!lAM<:
AUHiQRIZf,TION NO L8 6952
BY: _________________ '--________________.-. ____________._
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SIGNING DATE: 5jL'l/R..f-_.~~~---
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Agenda 'item NO.1 00
1.2009
Pag 8 of 41
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A PARCEL OF LAND LYING IN SECTION 17, TOWNSHIP 50 SOUTH, RANGE 26 EAST, COLLIER COUNTY, FLORIDA,
BEING MORE PARTICULARLY DESCRIBED AS FOLLOWS:
THE NORTH 10 FEET OF THE SOUTH 40 FEET Of THE NORTHWEST QUARTER Of THE NORTHWEST QUARTER OF
THE NORTHEAST OUARTER OF SAID SECTION 17.
CONTAINING 6668 SQUARE FEET. MORE OR lESS.
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Agenda Item No. 1.0D
December 1, 2009
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Agenda Item No. 10D
- 1.2009
I Page 0 0141
EXH BIT "A"
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Pag 40f9
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GRAPHIC SCALE
1".100'
WHITAKER PINES. LLC
OR 4251/3926
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TWP 50S,
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LEGAL DESCRIPTION
(10' DRAINAGE ACCESS & MAINTENANCE EASEMENT)
A PARCEL OF LAND LYING IN SECTION 17, IOWNSHIP 50 SOUfH, RANGE 25 EAST, COL~IER COUNTY, FLORIDA,
BEING MORE PARTICULARLY DESCRIBED AS FOLl_OWS
THE NORTH 10 FEET OF THE SOUTH 40 FEEl OF THE NQRrHE.AS'j OUARTLR OF THE NORTHWEST QUARTER OF
THl NORTHEAST QUARTER OF SAID SECnON 17
CONTAINING 6668 SQUARE f lEl, MORE OR LESS
NO_ LB 6952
MACa. NO./4 7 Dr\f../E
BY:_
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MAY 2 2 2009
NOT VALID WITHOUT THE SIGNATURE AND ORIGINAL RAISED SEAL OF A
fLORIDA LICENSED SURVEYOR.
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Page 1 of 41
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TWP 50S,
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LEGAL DESCRIPTION
(10' DRAINAGE ACCESS &: MAINTENANCE EASEMENT)
A PARCEL OF LAND LYING IN SECTION 17, TOWNSHIP 50 SOUTH, RANGE 26 EAST, COLLIER COUNTY, FLORIDA,
BEING MORE PARTICULARLY DESCRIBED AS FOLLOWS:
THE NORTH 10 FEET OF THE SOUTH 40 FEET OF THE NORTHWEST QUARTER OF THE NORTHEAST QUARTER OF
THE NORTHEAST QUARTER OF SAID SECTION 17
CONTAINING 6668 SQUARE FEET, MORE OR LESS.
PARCEL NO. 147 DAME 2
NOT VALID WITHOUT THE SIGNATURE AND ORIGINAL RAISED SEAL OF A
FLORIDA LICENSED SURVEYOR.
TEeM - ROW
MAY 2 2 2009
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,2009
Page 20141
hi EXHIBIT "An
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LEGAL DESCRIPTION
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Agenda Item No. 10D
,2009
Page 30141
EXHIBIT "A"
SKETCH AND LEGAL DESCRIPTION
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EXHIBIT "A"
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Agenda Item No, 100
December 1, 2009
Page 16of41
Agenda Item NO.1 OD
December 1. 2009
Page 17 of 41
-
MEMORANDUM
Date:
To:
From:
Subject:
June 8, 2009
Margaret Bishop, P.E.
John E. Ireland, P.E.
Condemnation Resolution for LASIP Phases 11 and 12 Improvements
A. Introduction - Lely Area Stormwater Improvement Project
At an upcoming meefing, the Collier County Board of Counfy Commissioners will
consider the adoption of a Condemnafion Resolution for the property interesfs
necessary to construct Segments 11 and 12 of the Lely Area Sformwater Improvement
Project (LASIP). This memorandum provides information that will assisf the board with
their decision concerning adopfion of this resolution.
When completed. the LASIP sysfem will provide a comprehensive stormwater collection
and transmission system for an area of East Naples, formerly known as Water
Management District 1#3, which has historically experienced significant stormwater-
related issues. The entire LASIP includes approximately 11,135 acres. The ultimate
discharge points of fhe LASIP are the Lely Canal and the Lely Manor Canal. The Lely
Canal discharges into an estuarine coasfal zone along the intercoastal waterway near
Dollar Bay. The Lely Manor Canal culminafes near the headwaters of Sandhill Bay and
discharges into Rookery Bay.
Increased development has not only impacted flooding levels, but also the water quality
of both the system itself and the discharging water bodies. Although water quality is
currently good. it is expected to deteriorate over time unless improvements are made to
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1 0 I Arthur Andersen Parkway, Suite 260, Sarasota, FL 34232
Phone: 941/378-0272 Fax: 941/371-7297
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Agenda Item NO.1 OD
December 1, 2009
Page 18 of 41
the water management system. Please note that background information conceming
the overall LASIP projecf has been provided by Agnoli. Barber & Brundage, Inc.
B. Description of Seqmenfs 11 and 12
Segments 11 and 12 of the LASIP improvements focus mainly on the section of
Whitaker Road between County Barn Road and the Santa Barbara Canal.
Improvements are being proposed to the north side of the road to collecf runoff from the
environmentally sensitive basin north of Whitaker and south of Crews Road. During
normal rain events, this runoff will eifher be transmitted east via an open swale through
a confrol structure to the Santa Barbara Canal (currently under consfruction), or runoff
will be transmitted west over a ditch block and via a culvert to County Barn Road, which
will be the future site of a 4-foot by 8-foot box culvert af a lafer phase of fhe LASIP.
During extreme rain events, flows can be diverted through a 4-foot by 8-foot box culvert
under Whifaker Road. The box culvert has an adjustable gafe to control the amount of
water discharged downstream. The flows that pass through the box culvert are
conveyed through an open swale to the Royal Wood Golf Course Property, where they
are piped via another 4-foot by 8-foot box culvert into the onsife stormwater pond
system at the Royal Wood Golf Course. Improvements to the Royal Wood Pond system
and its outfalls to fhe south at Rattlesnake Hammock Road have already been
completed as part of an earlier phase of the LASIP project.
The entire sysfem is gravity controlled and will require no extraordinary maintenance.
Access to all of the underground features is available should future repairs be needed.
The most direct route with the most minimal impacts to property owners and the
environment has been selected. In addition. the proposed layout utilizes existing right-
of-way whenever possible.
2
101 Arthur Andersen Parkway, Suite 260, Sarasota, FL 34232
Phone: 941/378-0272 Fax: 941/371-7297
'''-'.--'.
Agenda Item No. 10D
December 1. 2009
Page 19 of 41
,~~
C. LASIP Segments 11 and 12 Easement Requirements
Several easements are required across the parcels indicated on the exhibits for the
purpose of constructing the current segment of the LASIP project. These easements are
crifical for not only the construction of the improvements, but also fhe maintenance of
the system once complete.
The proposed easements are necessary based on an evaluation of the following
criteria:
1,
Alternate Routes
Several alternate alignments were considered as part of the proposed LASIP
improvements during the design and permitting process. A detailed alternatives
analysis was prepared for the permitting agencies and is presented in a
document entitled "Lely Area Sformwafer Improvement Project" dated October
2001. It has been determined fhaf fhe currenfly proposed route poses the most
public benefit with the least environmental impacts and at a minimum of cost.
~-
2, Safety Factors
The proposed LASIP improvements for Segments 11 and 12 will provide needed
additional sformwater runoff capacity for fhe basin and will reduce the risk of
flooding for the surrounding communities.
3. Long-Range Planning Factors
The LASIP improvements, including the current segment. are all part of a
counfywide initiative to advance fhe level of service for flooding in the Lely Area.
The improvements are meant to help promote sustainable development in the
-
3
101 Arthur Andersen Parkway, Suite 260, Sarasota, FL 34232
Phone: 941/378-0272 Fax: 9411371-7297
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Agenda Item NO.1 OD
December 1, 2009
Page 20 of 41
surrounding communities by increasing the functionality of fhe County
Stormwater System and improving safety for County residents.
4, Environmental Factors
The entire LASIP system has been designed to limit the amount of environmental
disfurbance as much as possible. Wherever feasible, existing stormwater
feafures have been utilized to preserve native habitats. The currenf segment of
the projecf does consist of minor impacts to wetland areas and upland habitats,
but the impacfs have been minimized by the proposed alignment. Most of the
impacts consist of regrading existing ditches along Whitaker Road that have
been deemed "other surface waters" by the South Florida Water Management
District.
5, Costs
The costs of the LASIP improvements, including the current segment of the
project, have been carefully considered, especially in the present financial
c1imafe. The intent from the beginning of the project was to maximize the benefits
to the community at a minimum of expense to the County. Each feature of fhe
system has been evaluated based on its value to the overall improvements to the
stormwater scheme versus its impact to the final co sf of the project.
We anticipate that Segments 11 and 12 of the LASIP project will take place during fiscal
year 2011. Thank you for your consideration.
4
] 01 Arthur Andersen Parkway, Suite 260, Sarasota, FL 34232
Phone: 94]/378-0272 Fax: 94]/371-7297
-
CONCEPTUAL PERMIT APPLICATION
LEL Y AREA STORM WATER IMPROVEMENT PROJECT
LELY CANAL AND LELY MANOR BASINS
REGION 3
NAPLES, FLORIDA
,<-,
Prepared!or:
COLLIER COUNTY BOARD OF COUNTY COMMISSIONERS
Naples, Florida
Prepared by:
AGNOLI, BARBER & BRUNDAGE, INC.
N apJes, Florida
Revision 3
September 2001
ABB Project 7599
Agenda Item No. 10D
December 1, 2009
Page 21 of 41
(Based in part upon materials previous~y prepared by Lmv Engineering and Environmental Services, Inc.
-
C: \A dlib Express lInput\Agenda.BCCA G ENDA. 63604.doc
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ERP Application, Revision 3, Region 3
Agenda Item No.1 OD
December 1. 2009
Sepfemberr;!Wje 22 of 41
REGION 3
NORTHEAST PORTION OF LELY CANAL BASIN
C: 'IAdlib Expres.~.IJl1ptdIA genda.BCCA GENDA. 63604, doc
LASI?
ERP Application, Revision ], Region 3
Agenda Item No. 10D
December 1, 2009
Septemherr;!fi1{fe 23 of 41
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TABLE OF CONTENTS
Page
LIST OF FIGURES.. .... ........ .... ..................................... .................. ........... ................. .......... ........ ii
REGION 3 - NORTHEAST PORTION OF LEL Y CANAL BASIN
3. I INTRODUCTION.. .... ..... ................ ................. ........ ....... ........... ........... ........ ......... .......3-1
3.2 EXISTING CONDITIONS ............................................................................................ 3-1
3.3 EVALUATION OF ALTERNATIVES..........................................................................3-4
3.4 PROPOSED PLAN..... .......... .......... ........................................ ............... .... .......... ..........3-8
3.5 IMPACTS ........... ....... ....... ..... ,........ ............. .............. ............. ....... ....... ..... .... ....... ......3-14
LIST OF APPENDICES
A: SOIL AND SEASONAL HIGH GROUND- WATER TABLE ELEVATION DATA
B: HYDROLOGICIHYDRAULIC ANALYSIS
C: WATER QUALITY DISCUSSION
D: CONSTRUCTION TECHNIQUES AND SCHEDULE
E: DRA WDOWN DISCUSSION
F: CONCEPTUAL AND PHASE ONE CONSTRUCTION PLANS
G: ENVIRONMENTAL IMPACTS AND PROPOSED MITIGATION PLANS
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LASI?
ERP Application, Revision 3. Region 3
Agenda Item NO.1 00
December 1, 2009
Seplember'WJfI;je 24 of 41
LIST OF FIGURES
Fi2ure
3.11 Alternative 2
3.12 Alternative 3
..
11
LASIP
ERP Application, Revision 3, Region 3
Agenda Item NO.1 00
December 1, 2009
September~e 25 of 41
-
REGION 3
NORTHEAST PORTION OF LELY CANAL BASIN
3.1
INTRODUCTION
^""~
Collier County is requesting an overall conceptual Environmental Resource Pennit (ERP) and a
construction and operation permit for Phase I of a storm-water management system project known
as the Lely Area Stormwater Improvement Project (LASIP). These improvements will be made in
the Le1y Main Canal, Lely Branch, and Lely Manor drainage basins located in Naples, Florida.
Phase One consists of improvements to the Lely Main Canal from US-41 to Rattlesnake Hammock
Road (Region 2), the Le1y Branch Canal located north of Rattlesnake Hammock Road (Regions 2
and 4) and the Le1y Manor Main Canal eastern outfall (Region 5 east). There are no Phase I
improvements in Region 3. Development pressures within these two basins (aka, Water
Management District #6) have created a critical need for a primary storm-water management
outfall system to address the current issues and those expected to arise. The tenn "primary storm-
water management outfall system" is important to understanding the objectives of this application.
A primary outfall system is designed to receive flows from developments along the route. It is the
responsibility of the designer of each of these developments to meet current South Florida Water
Management District (SFWMD) and Collier County rules for water quality and quantity
discharges.
For purposes of permitting LAS1P is divided into seven regions grouped according to land use and
hydrology. Regions 1 through 3 constitute the Lely Main Canal Basin, Region 4 is a tributary to
the Lely Canal Basin named the Lely Branch, and Regions 5 through 7 are divisions of the Lely
Manor Basin. This chapter of the application addresses Region 3.
3,2 EXISTING CONDITIONS
_.
Description ~ This northeast segment of the Lely Canal Basin is a less intensely developed area
consisting mostly of single family homes on land parcels approximately 2.5 acres in size north of
Royal Wood Development in Sections 17, 8 and 9. The regional boundaries are Davis Boulevard
to the north, Royal Wood to the South, County Barn Road to the west, and Sunset and Sandy Lane
and Section 16 to the east. An important feature of this region is a historic flow way located in
Sections 9, 8 and 17. The area of Region 3 is 1,383 acres.
3-1
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LAS/?
ERP Application, Revision ], Region 3
Agenda Item NO.1 00
December 1, 2009
September ~e 26 of 41
:Dmography, Ground Water and Soils ~ Based on SFWMD/WMD#6 aerials with contours, ground
surface elevations range from 9.5 to 8.5 with some low areas in Section 8 at elevation 7.5 or
slightly less. Overall, the area is flat and, except for the historic flow way, there is no well defined
flow direction.
The dominant soils in this region are Pineda, Malabar, and Boca fine sand. The percolation rate is
slow to moderate. In most years, under natural conditions, the seasonal high water table is within
12 inches of the surface for 3 to 6 months. In other months, the water table is below 12 inches and
recedes to a depth of more than 40 inches during extended dry periods. During periods of high
rainfall, the soil is covered by shallow, slowly moving water for periods of about 7 to 30 days. The
soils map in the conceptual plans set !,rives the soil types for this region, and descriptions for the
soil types are provided in Appendix ;\, along with additional data about water table elevations.
Environmental ~ Land uses within this region have been delineated but no jurisdictional
determination has been made. Land uses as described by the Florida Land Use, Cover and Fonns
Classification System (FLUCFCS) within the area desi!,'llated as within the regional area are shown
in the conceptual plans set.
Hydrology ~ Runoff from this region generally flows to the south or to the west where much of it is
intercepted by County Barn Road. Complicating this region's hydrology is the cxisting drainage
system for Davis Blvd. Because of past development activity being constructed under the premise
that a regional storm watcr system would be implemented, the cxisting culverts that cross under
Davis Blvd. no longcr function as equalizer culverts. but provide points of input rrom lands to the
north.
Conveyance of storm water within this region is handled by the existing ditches along both the east
and west sides of County Barn Road, a wetland flowway through the center of the region, and some
ditching near the eastern side of Royal Wood. Roadside ditches along County Barn Road are small
with small driveway culvert crossings. There are seven locations where culverts under County
Barn Road allow flow to pass to the existing ditch on the west side of the road. Developed areas
have built up near the road particularly at the southern end The capacity of this part of the region's
storm-watcr management system is limited. At the south em end of County Barn Road the ditches
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ERP Application, Revision 3, Region 3
Agenda Item No. 100
December 1, 2009
September ';!fJfJje 27 of 41
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discharge into a widely varying layout of culverts that ultimately discharge into double 54-inch
culverts that then discharge into the Main Lely Canal upstream of Dora1 Circle.
A portion of the conveyance in this region is provided by a historic flow way oriented in a
northeast to southwest direction from about one-quarter mile east of the Falling Waters
Development outlet to Whitaker Road near County Barn Road. Within the flowway area north of
Whitaker Road there is a sizable area of shallow ponding that tries to flow to County Barn Road as
well as overtopping Whitaker Road and thence flowing into the Royal Wood development. There
has been sorne residential development in this flow way and Cope Lane, Country Road and
Whitaker Road cross it. Some of the residences experience flooding and related impacts to wells
and septic systems. Small culverts beneath the roads and shallow flow over the existing low points
of the road surface currently restrict passage of flows.
->"".
This region also includes the area northeast and east of Royal Wood. Storm-water runoff ITom
developments along Sunset and Sandy Lane drains southwesterly toward Royal Wood as does the
area immediately to the north of Royal Wood. There is an existing channel that tries to intercept
some of this runoff and direct it south adjacent to the east boundary of Royal Wood into the Polly
Avenue roadside swale. The capacity of the Polly Avenue swale is very limited.
A computer model was developed to simulate existing condition hydrology for a 25-year, 72-hour
storm event. A summary of flow rates and flood elevations predicted by the model are tabulated
below. For more information about hydrolo!,'Y and the model, refer to Appendix B.
Location Flow (cfs) Elevation
County Barn and Country Road 28 9.1
Cope Lane 12 9.8
County Barn and Whitaker 20 8.4
-
Flood Problems - Flooding of houses, streets and yards is a persistent problem in this area because
there is no outlet to drain accumulated storm water. For example, water levels in Royal Wood
were 1.6 feet above ground surface in August 1995 during a storm named Jerry. The rainfall
amount for Jerry exceeded a 25-year, 3-day storm event in many portions of the project area.
Similar or higher water depths occurred throughout this region during that stonn. Whitaker Road
frequently overtops and the sheet flow causes extensive flooding in Royal Wood and the
Edgewood Condominiums.
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Agenda Item NO.1 00
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Septemher ~e 28 of 41
Water Quality - No major developments exist in this region except Falling Waters so water quality
tends to be what would be expected from an area with isolated homes. Falling Waters was
permitted and constructed recently, so discharges from this development meet current water quality
standards.
3.3 EV ALUATlON OF ALTERNATIVES
3.3.1 Description
Within Region 3, the main project objective of the proposed improvements to the existing storm-
.
water management system is to reduce flooding of isolated home sites and roads. A secondary
objective is to maintain or enhance the wetlands within the historic flow way.
3.3.2 Alternatives Descriptinn and Evaluation
Three alternatives were considered in order to accomplish the objectives for this region. In order to
select the preferrcd alternative, each one was evaluated based on six critcria.
Flood Relief
Provide flood relief for home sites in this region.
Water Quality
Maintain existing water quality and, if possible, create improvements.
Environmental
Minimize or avoid destruction of wetlands or altering existing
hydroperiod and minimize or avoid destruction of wildlife habitat.
Other Impacts
Consider the impact of the proposed development on the potential future
development plans.
Reliability
Minimize the potential for a failure or provide a backup system.
Costs
Consider the cost compared to the potential benefits.
Alternative] - Alternative I is to leave the area as it is now.
Analvsis of Alternative] - No Action
Flood Rclief
This No Action alternative would provide no flood relief.
Water Quality
Water quality impacts would be minimal if this alternative were to be
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ERP Application, Revision 3, Region 3
Agenda Item No. 10D
December 1, 2009
September~e 29 of 41
implemented.
Wetland Impacts
The hydroperiod for adjacent wetlands would not be changed by
implementing this alternative and there would be no new wetland
disturbance. The few small existing uncontrolled ditches and channels
would continue to act as drawdown.
Other Impacts
Implementing this alternative would not be beneficial to future
development or provide any improvement or reduction of exotics
invasion of the existing wetlands.
Reliability
N/A
Land Costs
The land costs for this alternative would be zero.
Construction Costs
The construction costs for this alternative would be zero.
O&M Costs
O&M costs for this alternative would not change from current values.
"".,
Evaluation
This No Action alternative is attractive based upon the construction and land cost, and there will be
no impacts on wetlands. However, it provides no flood relief for upstream or future development,
and there would be no controls on water levels. Overall evaluation of this alternative is that it is
the least attractive of the alternatives considered.
Alternative 2 - Alternative 2 is to construct a canal north of Royal Wood to collect storm water
ITom the northeast. This canal would cxtend to near the south boundary of Falling Waters then east
to near the western outfall structure for the existing Naples Heritage (aka Shamrock) Development.
Weirs with gates would be constructed in this canal to maintain water levels in the wetlands north
of Cope Lane. This canal would intercept high flows in the historic flow way to provide flood
relief for areas around Cope Lane, Country Road and Whitaker Road. Storm water accumulating
between the canal and County Barn Road would continue to flow southwestwardly toward the road
ditch along the east side of County Barn. Storm water from the Sandy Lane/Sunset Blvd. area
would be collected in a canal discharging to the canal north of Royal Wood (refer to the aerials in
conceptual plans set to better understand the layout of this region).
Analysis of Alternative 2 - Canal
Flood Relief
This alternative would provide flood relief.
c_
Water Quality
Water quality impacts would possibly occur rrom the implementation of
this alternative because of the elimination of the flow through the
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LAS/?
ERP Application. Revision 3, Region 3
Agenda Item NO.1 00
December 1, 2009
September "~e 30 of 41
wetland areas.
Wetland Impacts
The hydroperiod for adjacent wetlands and the slough could be changed
by implementing this alternative if weir crests were low. There would
be wetland disturbance.
Other Impacts
Implementing this alternative would be beneficial to future
development.
Reliability
The reliability would be high if the weirs were sized to adequately pass
the peak flows with the weir gates fully closed.
Land Costs
The land costs for this alternative would be an important consideration
because the canal would begin in an area under consideration for future
development.
Construction Costs
The construction costs for this alternative would be above that for
Alternative 1.
O&M Costs
O&M costs for this alternative would be typical for a canal with weirs.
Evaluation
Implementing this alternative meets the project objective of flood relief but falls short of the goal in
the area of water quality protection, maintaining hydroperiod in wetland arcas and minimal
disturbance of wetland areas. The costs for land and construction would be reasonable considering
the flood relief benefits.
Alternative 3 - Alternative 3 is the same as Alternative 2 above except terminate the canal north of
Royal Woods at the southern boundary of the flow way (approximately 1100 feet north of Country
Road). A weir with a slide gate would bc placed at this location. The weir would maintain water
levels in the flow way and associatcd wetlands while providing a drainage outfall to the flowway
when water levels exceeded the elevation of the weir crest. In the event of an impending stonn, the
weir gate could be opened to lower water elevations in the upstream area, as needed, to provide
storage and an outlet for storm water.
Flood relief for the area between County Barn Road and the canal north of Royal Wood would be
provided by improving roadside swales on thc north side of Country Road and Whitaker Road.
These would drain either to County Barn Road or to the canal draining into the northeast corner
Royal Woods. Also, a second channel/culvert system draining to tbe northwest side of Royal
Wood would collect additional flows at the southwest end of the flow way and immediately north
of Royal Wood (refer to the conceptual plans set).
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ERP Application, Revision 3. Regio/l 3
Agenda Item No. 100
December 1, 2009
September r;!QfJ;je 31 of 41
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The limits of the flow way would be established by a surveyed line. Land within the limits of the
flowway and not directly purchased by the County or other development interests for purposes of
wetland mitigation or preservation could have restrictions placed upon it to protect the wetlands
ITom development and maintain the current pattern of low density residential development.
Analysis of Alternative 3 - Preserve Flow Way
Flood Relief
This alternative would provide flood relief.
Water Quality
Water quality impacts would be minimal rrom the implementation of
this alternative.
Wetland Impacts
The hydroperiod for adjacent wetlands would not be changed by
implementing this alternative and there would be minimal disturbance to
wetlands. Wetlands purchased for mitigation and preservation would be
cleared of exotics.
Other Impacts
Implementing this alternative would be beneficial to future development
in most areas. It could limit future development in the areas along Cope
Lane, Country Road, and Whitaker Road that are within the flow way.
,~.,
Reliability
The reliability would be high if the weirs were sized to adequately pass
the peak flows with the weir gates fully closed. Storage of storm water
within the t10wway would reduce downstream discharge rates.
Land Costs
The land costs for this alternative would be for easements and purchase
of entire parcels for wetland mitigation/preservation.
Construction Costs
The construction costs for this alternative would be above that for
Alternative 1 but less than Alternative 2.
O&M Costs
O&M costs for this alternative would be typical for a canal with weirs
and not much higher than current levels. O&M costs for the t10wway
would be minimal after the first few years of extensive exotic plant
removal and control effort.
Evaluation
Implementing this alternative meets many project objectives such as flood relief, water quality
protection, and maintaining hydroperiod in wetland areas. Costs would be reasonable compared to
the potential benefits. This is the preferred alternative.
,"-~,
Alternative Selection ~ Alternative 3 was selected over Alternative 2 because it provides flood
relief and maintains the existing flow way. Also, no new canal is proposed through the northeast
part of the flow way. Alternative 1 does not meet the project objective of flood relief.
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LAS/P
ERP Application, Revision 3. Region 3
Agenda Item No. 100
December 1, 2009
September~e 32 of 41
The desi!,'ll of the preferred system
focused around maintaining the existing flow way.
Disturbance of wetlands in the flow way was minimized. A number of developers have
approached the County with an idea to buy properties with wetlands to preserve them as off-site
mitigation for other developments. Some acquisition has occurred, and acquisition and
preservation fit into the proposed storn1-water improvement plans. Except for the new
channel/culvert systcm discharging into the northwestern side of Royal Wood, new canals and
swa1e structures are along roads or in upland areas to avoid impacts to quality wetlands. The
proposed scheme maintains the existing flow way and provides flood relief.
3.4 PROPOSED PLAN
Description - The components of the storm-water management plan 10 this region are:
. A new canal in Section 8 approximately 100 feet west of the section line
scparating Sections 8 and gextending from the northeast corner of Royal
Wood north to approximately 600 feet south of Cope Lane.
. The existing flow way
. Improved roadside swales along the north side of Country and Whitaker
Roads and portions of Cope Lane.
. A channel and box culvert installed to convey flows from the northwest
corner of Royal Wood into one of the Royal Wood lakes.
. Drainage system for the east side County Barn Road that will separate
offsite flow from untreated road runoff.
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LASIP
ERP Application, Revision 3, Region 3
Agenda Item No. 100
December 1, 2009
Seplember~e 33 of 41
-.
Canal into N.E. Royal Wood - A portion of the storm water from the northeast will be collected at
the northern end of a proposed canal (LCB-00-C0070 through LCB-00-C0075) discharging into the
northeast corner of Royal Wood. The alignment of this canal will be approximately 100' west of
the section line between Sections 17 and 16 at the southern end and Sections 8 and 9 at the northern
end. Improved roadside swales along the north side of Country (aka, Crews) and Whitaker Roads
will collect flows and provide conveyance rrom areas to the west of the canal and discharge into
this new canal.
,n"_
The proposed canal to discharge into the northeast corner of Royal Wood will begin at the north
end of an existing waterway that currently is connected to the lakes in Royal Wood. Years ago the
layout of the lake system in the Royal Wood development was designed with this proposed
regional stormwater management system in mind. Refer to the conceptual plans set for drawings
that show the existing waterway near the outlet and thc proposed canal north to near Cope Lane.
To prevent over drainage of wetlands north of Royal Wood, a weir with gates (LCB-00-SOI60)
will be installed near the northeast corner of Royal Wood. A second weir with gates (LCB-OO-
SO 165) is proposed approximately 1300 feet upstream near the southeast corner of Section 8 and a
third weir with gates (LCB-00-SOI67) is planned at the upper end of this canal approximately 600
feet south of Cope Lane to regulate water levels in upstream areas.
The ground elevations in the area of the canal leading to the northeast corner of Royal Wood
generally range ITom 8.0 to 9.0 feet NGVD. Choosing an elevation for the weir crest at Royal
Wood and the two further upstream required balancing the need for flood relief without draining
the flow way and the area along the canal. Dawn Underwood, with South Florida Water
Management District, the County, and LAW chose a couple of locations to estimate the seasonal
high water table elevations in order to set weir crest elevations. The locations are within a
reasonable distance of the route of the proposed canal leading into the northeast corner of Royal
Wood. A mark was made on a tree at each of these locations at the estimated seasonal high water
table elevation. The elevations were surveyed based on NGVD. The seasonal high water table in
the area north of the northeast corner of Royal Wood was 9.2 feet at both locations. These
elevations confinn an earlier survey performed by the County in this area and an area to the
northeast.
-
It is not possible to set weirs in this canal to maintain water levels at elevation 9.2 feet and expect
to provide any flood control in this area. In fact, that plan would cause more flooding. The small
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ERP Application, Revision 3, Region 3
Agenda Item NO.1 00
December 1, 2009
Seplemberfi!lJf/;je 34 of 41
poorly defined swales and ditches in the area are uncontrolled and have flow lines in the range of
6.0 with an ultimate discharge through a shallow swale along the west side of Polly Avenue.
Therefore, it is proposed that weirs be constructed in this area and the crests be set at or slightly
below nearby !,'found elevations. The crest of the upper weir, located just south of Cope Lane
(LCB-00-SOI67), is to be set at 9.0 feet. The middle weir (LCB-00-SOI65) is to be located near
the section corner (8, 9, 16, 17) at elevation 8.5 feet. The southernmost of the three proposed
weirs (LCB-00-SOI60) will be located immediately upstream of Royal Wood with a crest elevation
of 7.5 feet. This arrangement allows for flood control and maintenance of water levels in adjacent
lands.
Two roadway culverts LCB-OO-SOI64 (Whitaker Road) and LCB-00-SOI66 (Country Road) are to
be installed in the canal to Royal Wood (refer to tbe conceptual plans set). Typical cross sections
of the canal and details of the structures are included in these conceptual plans.
The proposed swa1e along the north side of Whitaker Road (LCB-14-C0005) and Country Road
(LCB-15-C0005) will be approximately 3 feet deep with side slopes of 3 horizontal to 1 vertical
and a bottom width of 3 feet. These swales are designed to allow the County to provide f100d relief
in areas along the perimeter of the flow way during and following major storm events while
maintaining water levels the rest of the time. The swalcs will discharge via culverts under the
proposed canal maintenance road into the the canal leading into Royal Wood A slotted inlet box
will restrict the amount of flow that can flow in an easterly direction along the north side of
Whitaker Road. The top of the grate will be at elevation 8.5 with a slot at elevation 7.5. Refer to
the conceptual plans set for drawings and details of the culverts and inlet structure. The swale
nortb of Whitaker Road is also part of a system that can divert stonn water into the west side of
Royal Wood. This system is described below.
Improvements are also proposed to an existing east-west channel (LCB-12-C0005 and LCB-12-
COOI5) along the section line between Sections 9 and 16. This improved channel will carry local
inflows in this area and runoff rrom Sunset Lane to the canal discharging into the northeast corner
of Royal Wood (see the conceptual plans). Wbere this channel crosses Sunset Ave., a new culvert
(LCB-12-S0100) will be installed. Additionally, a culvert with a slide gate (LCB-12-S011O) will
be installed beneath Polly Avenue. The slide gatc will nonnally be closed, but it will allow the
County to divert flows between the Lely Main Canal basin and the Lely Manor Canal basin if
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ERP Application, Revision 3, Region 3
Agenda Item No. 100
December 1, 2009
September~e 35 of 41
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emergency conditions require this for flood relief. When the gate is closed runoff from Sandy Lane
will enter Royal Wood.
Flow Way - The proposed plan for the area in the northeastern portion of the region is to utilize the
existing flow way to colleet and convey flow from the northeast end of the basin as it is discharged
from future and permitted developments (Falling Waters and Naples Heritage (aka Shamrock)).
Just north of Cope Lane there is a short segment of swa1e (LCB-16-COOI5). This swale
improvement is proposed to transport storm water which is currently trapped and causes flooding
of existing residence yards and outbuildings. This swale will discharge via a proposed 24" culvert
under Cope Lane into the flowway.
Channel into N.W. Royal Wood - The swa1e along the north side of Whitaker Road is designed to
provide conveyance:
. Eastwardly into the canal discharging into the northeast corner of Royal
Wood (described above).
"~H
. Southerly into a channel and box culvert system discharging into the
northwest side of Royal Wood.
. Westerly into drainage improvements along the east side of County Barn
Road.
A ditch block with a crest elevation of 8.5 will be placed in the swale along the north side of
Whitaker Road approximately 2,600 feet west of the proposed canal into the northeast corner of
Royal Wood. A box culvert (LCB-13-S0100) 4 feet high by 8 feet wide will be located east of this
ditch block and beneath Whitaker Road. This culvert will allow stonn water to flow to the south
via a channel (LCB-13-C0005) and a long box culvert leading to one of the lakes located on the
west side of Royal Wood. A twelve-foot wide weir (crest elevation 7.5) will be installed on the
upstream headwall of the culvert to maintain water levels in the flow way. The channel (LCB-13-
C0005) will be 3 feet deep, 3 feet bottom width with side slopes of 3 horizontal to 1 vertical. The
box culvert at the end this channel will be approximately 1,900 feet long and 4 feet high by 8 feet
wide. Refer to the conceptual plans for a plan of these improvements.
-
County Barn Road - Storm-water accumulations in the very northwest part of this region and part
of the flows in the flow way will be collected by the drainage system planned along the east side of
County Barn Road. In most locations existing channels and swales will be utilized to collect flows
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ERP Application. Revision 3. Region 3
Agenda Item NO.1 00
December 1, 2009
Seplember~e 36 of 41
from the land to the east of County Barn Road. A culvert is planned near the west end of the swale
along Whitaker Road where easements limit the type of conveyance. Also, as mentioned above, a
ditch block at elevation 8.5 will prevent the swale along the north side of Whitaker Road rrom
discharging excessive amounts of flow into the County Barn Road system.
County Barn Road is currently designed for total reconstruction as a divided 4-lane roadway. The
design eliminates all existing cross drains that currently allow excess runoff from lands east of the
road to flow into the west roadside swale. The proposed improvements are for the construction of
a channel and culvert system along the east side of the roadway with sufficient capacity to convey
the offsite storm water to the south and into the Main Lely Canal. When County Barn Road is
reconstructed as a 4-lane roadway, the west side swale will be modified to provide water quality
treatment for the roadway as well as some conveyance of offsite flow from lands imrnediately
adjacent to the west. OIle of the majur concerns about reconstructing the channel on the east side
of County Barn Road is to provide flood protection to existing developed properties which are
currently experiencing flooding without causing undue drawdown impacts to nearby wetlands and
creating additional drawdown of water levels in the flowway.
To prevent major drawdown impacts to wetlands adjacent to the northeast side of County Barn
Road, a weir with a crest elevation of 8.0 is proposed for construction just north of the intersection
of County Barn Road and Country Road. This proposed weir will provide for a controlled
elevation higher than the existing uncontrolled condition for land north of Country Road.
A tabulation of structure and channel gcometry is given in Appendix B in the SWMM model
results table.
Ground Water ~ Ground-water levels throughout the region are maintained through the carcful
selection of crest elevations for weirs.
Hvdrology - The future land use of the flow way is not projected to change significantly.
Conveyance in this area is via roadside swales that carry flows either to Royal Wood or County
Barn Road. Some of the flows currently overtop the roads at low places and/or flow though small
culverts beneath the roads. In the future, these low points may be filled and the roadway elevation
increased. If that occurs, then culverts will provide conveyance downstream as needed. The
hydrology in this part of the region will not change si!,'llificantly in the future, but the routing of
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ERP Application, Revision 3, Region 3
Agenda Item No. 100
December 1 , 2009
September~e 37 of 41
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flows will be impacted by higher roadway elevations and the installation of the improvements
proposed in this conceptual permit application.
The area between the north edge of the flow way and Davis Boulevard is under developrnent now.
It is anticipated that this development pattern will continue until most of the area is comrnercial or
residential development. The outlet for these systems will be to County Barn Road or into the flow
way. The land south of Whitaker Road down to Royal Wood is anticipated to develop in the future
and will require an outlet to either the east or west sides of Royal Wood or to County Barn Road.
There is an existing ditch (LCB-ll-C0005) between Naples Estates Mobile Home Park and Royal
Wood, but the width of the easement is too narrow to provide a significant open channel outlet for
anything more than its current use.
The area around Sunsct and Sandy Lane is currently light density residential and should not change
significantly in the future. Improvements to the existing roadside swales and a better outlet (LCB-
12-C0005 and LCB-I2-COOI5) are future improvements needed for this portion of Region 3.
~-"',
A computer model was developed to simulate future condition hydrology for a 25-year, 72-hour
storm event. Future condition hydrology accounted for future land use changes. These
developments will have to meet SFWMD and County requirements, and that was accounted for in
the model. A summary of flow rates and flood elevations predicted by the model are presented
below. For more information about hydrology and the model, refer to Appendix B.
Pre-Development Post-Development
25-Year 25-Year
Flow Stage Flow Stage
Location (cfs) (feet) (cfs) (feet)
County Barn and Country Road 28 9.1 45 7.5
CountY Barn and Whitakcr 1 1 7.8 45 7.3
Cope Lane 12 9.8 28 8.8
Refer to the conceptual plans for channel and watcr surface profiles of the proposed improvements
for this region. A tabulation of flows and stages is given in Appendix B.
--
Water Ouality ~ The proposed canals and weirs create some live detention storage which provides
water quality treatment. Thc weir crest elevations were chosen to prevent damaging groundwater
drawdown to adjacent wetlands and still provide an improved level of flood protection to existing
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ERP Application. Revisioll 3. Region 3
Agenda Item NO.1 00
December 1, 2009
Seplember r;>lli{fe 38 of 41
residences. The proposed system of improvements directs water through the existing flow way
between Cope Lane and Whitaker Road where feasible. Therefore, some of the storm water will
receive treatment from passage through the wetland flowway. It is anticipated that most of the area
will continue to remain in a light residential land use. All new developments that may be proposed
within the region will be required to address and provide stormwater quality treatment as part of
their individual permitting responsibilities. In summary, no water quality reduction is projected as
a result of constructing the proposed system within Region 3.
Construction, Operation and Maintenance - Collier County will be responsible for the construction
of the proposed improvements in this region. This includes preparation of construction drawings
and specifications, obtaining all local, regional, state and federal permits, implementing the
provisions of the permits, managing the construction and providing certifications. The County
plans tu hire firms/contractors to complete the various components of the work. A discussion of
construction techniques and schedule is given in Appendix D.
Collier County will be responsible for the operatIOn and maintenance of the proposed
improvements. The County will provide an operation schedule for the gated structures and a
schedule for maintaining the proposed improvements in the application for construction.
3.5 IMPACTS
Permanent Impacts - Permanent impacts are due to excavation of the canal to the northeast corner
of Royal Wood, improvements to roadside swales along Country and Whitaker Roads, the
proposed canal/culvert to the northwest corner of Royal Wood. proposed improvements to the
existing channel extending toward the Sandy Lane area and construction of the improved channel
along the east side of County Barn Road. Refer to the conceptual plans to see the location of the
impacts.
Temporary Impacts . All constructlOn IS anticipated to occur within the existing or proposed
drainage easements and/or road rights-of-way. There are no temporary impacts anticipated at this
time.
Secondary Impacts - The proposed design allows the County to generally maintain water levels in
the canals above current levels, so ground-water levels in adjaccnt lands should be equal or higher
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LA SIP
ERP Application, Revision 3. Region 3
Agenda Item No. 100
December 1 , 2009
September~e 39 of 41
,,-~
than existing conditions in most locations. The construction of a portion of the canal extending to
the Sandy Lane area (LCB-12-COOI5) will possibly create secondary impacts. The existing ditch is
very shallow to almost non-existent with a depth of approximately 1.5 feet at the eastern side of
Sunset Blvd. where the existing metal culvert is proposed to he replaced by a 48" RCP. Adjacent
ground elevations are in the 8-8.5' range. The improved canal will be controlled at elevation 7.5.
The proposed control elevation of 7.5 is no lower than the existing swa1e elevations therefore no
secondary impacts are anticipated. Refer to Appendix E for a drawdown discussion.
A tabulation of wetland and upland data is given in Appendix G. A summary is given below.
Area
(acres)
Wetlands 1mnacts 10.7
Other Surface Water 4.5
Uplands 5.6
Total Project Area 20.8
-
In order to evaluate how well the proposed system will maintain water levels in the wetland/flow
way system during storms that will occur more frequently, a 5-year, 24-hour storm event was
simulated with the model. The results indicate that water will be flowing in the flow way at a rate
of 23 cubic feet per second (Link lIB). This is a positive result indicating that proposed system
will accomplish the goal of continued water flow in the flow way. Refer to Appendix B for model
results.
_..
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ERP Application, Revisio/J 3. Region 3
Agenda Item NO.1 00
December 1, 2009
September ~e 40 of 41
TABLES
LASIP
ERP Application, Revision 3, Region 3
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Agenda Item NO.1 00
December 1, 2009
September ~e 41 of 41
FIGURES
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