Agenda 06/23/2009 Item #16A10
Agenda Item No. 16A 10
June 23,2009
Page 1 of 22
EXECUTIVE SUMMARY
Recommendation that the Board of County Commissioners (Board) approve
Change Order 1 to Contract # 08-5122 with Post, Buckley, Schuh & Jernigan for a
Phase 2 cost of $1,303,397.38 to develop Watershed Management Plans required by
the Growth Management Plan
OBJECTIVE: To have the Board approve Change Order 1 to contract # 08-5122 with
Post, Buckley, Schuh, & Jernigan, Inc. (PBS&J) to develop Watershed Management
Plans (WMP) in order to protect Collier County water resources pursuant to Objective 2.1
of the Coastal Conservation and Management Element as amended in the 2006 EAR
based amendments to the Growth Management Plan.
CONSIDERA TION:
Request for Proposal (RFP) 08-5122, Watershed Model Update and Plan Development
was posted by the Purchasing Department on September 11, 2008. Four hundred and
nine notices were sent and 119 firnls downloaded the RFP from the E-Procurement site.
Nine firms submitted proposals by the closing date of October 9, 2008. On November
25,2008, the Selection Committee ranked PBS&J number one by consensus. The Board
of County Commissioners approved Phase 1 of the contract March 10, 2009, to update
the BCB hydrologic model and asses water quality conditions.
Objective 2.1 of the Coastal Conservation and Management Element, recently amended
in the 2006 EAR based amendments to the Growth Management Plan, requires WMPs to
be completed by 2010. Furthermore, since the process should integrate with past and
current efforts of the Big Cypress Basin Board (BCBB), the contract and its scope of
work also addresses the integration of these efforts.
WMPs will provide a water budget, address elements of flood control, water quality,
natural systems and water supply. Results obtained from Phase 1 will be used to evaluate
5, 10, 25, and 100 year frequency design storm event effects on flooding and to re-
evaluate Level of Service standards for basin discharge rates. Performance Measures
will be defined to evaluate alternatives. A Water Quality model will be developed for the
Golden Gate basin and a pollutant loading model will be developed for the other basins.
Recommendations from prior studies and new alternatives will be evaluated using the
developed performance measures. Some selected alternatives will be evaluated using the
updated model.
Key deliverables for Phase 2 will include water budgets by basin, defined performance
measures, water quality model for the Golden Gate basin, an evaluation of alternatives
and WMPs that include the highest ranked alternatives. Draft results will be available for
review by January 2010. The WMPs will be completed by April of 201 O.
-
Agenda Item No. 16A 10
June 23. 2009
Page 2 of 22
FISCAL IMPACT: The Board of County Commissioners as part of the FY 2007
approved budget allocated $4,000,000 in General Fund (00 l) money to fund this
initiative. During the initial year - FY 2007 - $103,063 was spent to offset personal
services and operating expense. In FY 2008, $315,668 in actual expenses were posted to
the program. To date during FY 2009, the dollars spent or encumbered total $1,988,793.
Thus, the remaining balance which will be budgeted in FY 2010 totals $1,592,476. The
FY 2010 budget is based upon the initial $4,000,000 allocation minus what has been
spent in FY 2007, FY 2008 and that amount spent and encumbered in FY 2009.
Sufficient budget does exist to approve this change order. As this project approaches
completion, an evaluation of all actual and encumbered expenses will be performed and if
necessary budget amendments will be processed to make sure that the initial $4,000,000
allocation is not exceeded. Any excess funds would be placed within General Fund (001)
reserves. In the event this project requires additional funds above the $4,000,000
allocation, an executive summary will be brought before the BCe.
The Watershed Management Plan budget received $496,405.50 from the South Florida
Water Management District to offset expenditures on the LIDAR project in August 2008.
GROWTH MANAGEMENT IMPACT: Execution of the Contract will support
objective 2.1 of the Conservation and Coastal Management Element of the County
Growth Management Plan.
LEGAL CONSIDERATIONS: This item has been reviewed and approved by the
County Attorney's Office, is not quasi-judicial and requires no ex parte disclosure,
requires only a majority vote for approval, and is otherwise legally sufficient for Board
action. -SR T
RECOMMENDATION: That the Board approve Change Order 1 to Contract 08-5122
to PBS&J to provide Services for Phase 2 of the Watershed Management Plans and
authorize the Chairn1an, to sign Change Order 1 after County Attorney review for Phase
2 for a cost of$1,303,397.38.
PREPARED BY: Mac Hatcher, Senior Environmental Specialist
..-.-,
Item Number:
Item Summary:
Meeting Date:
Page 1 of 1
Agenda Item No. 16A 10
June 23, 2009
Page 3 of 22
COLLIER COUNTY
BOARD OF COUNTY COMMISSIONERS
16A10
Recommendation that the Board of County Commissioners approves Change Order 1 to
Contract #08-5122 with Post, Buckley. Schuh & Jernigan for a Phase 2 cost of $1,303,397.38
to develop Watershed Management Plans required by the Growth Management Plan.
6/23/2009 90000 AM
Date
Prepared By
Mac Hatcher
Environmental Specialist
Environmental Services
6/9/200912:44:15 PM
Date
Approved By
William D. Lorenz, Jr., P .E.
Community Development &
Environmental Services
Environmental Services Director
Environmental Services
6/111200912:39 PM
Approved By
Date
Judy Puig
Community Development &
Environmental Services
Operations Analyst
Community Development &
Environmental Services Admin.
6/11/20092:00 PM
Approved By
Joseph K. Schmitt
Community Development &
Environmental Services
Community Development &
Environmental Services Adminstrator
Date
Community Development &
Environmental Services Admin.
6/11/20092:43 PM
Approved By
ScottR. Teach
County Attorney
Assistant County Attorney
County Attorney Office
Date
6/11/2009 3: 39 PM
Approved By
Jeff Klatzkow
County Attorney
Date
County Attorney
County Attorney Office
6111/20094:20 PM
Approved By
Kelsey Ward
Administrative Services
Date
Contract Administration Manager
Purchasing
6/11120095:04 PM
Approved By
OMS Coordinator
County Manager's Office
OMB Coordinator
Office of Management & Budget
Date
6/12/20098:27 AM
Date
Approved By
Leo E. Ochs, Jr.
Board of County
Commissioners
Deputy County Manager
County Manager's Office
6/16/20093:59 PM
file:IIC:\AgendaTest\Export\132-June%2023,%202009\16.%20CONSENT%20AGENDA \ 1... 6/17/2009
Agenda Item No. 16A 10
June 23,2009
Page 4 of 22
CHANGE ORDER
CHANGE ORDER NO.
CONTRACT NO. 08-5122
BCC Date: March 10.2009
Agenda Item: 16. A. 10
TO: Elliott L. Grosh, P.E.
Post Buckley Schuh & Jernigan. Inc.
5300 West Cypress Street. Suite 200
Tampa. FI. 33607
DATE:
PROJECT NAME: Watershed Mana2ement Plans
PROJECT NO.:
Under our AGREEMENT dated March 10. 2009 .
You hereby are authorized and directed to make the following change(s) in accordance with tenus and
conditions of the Agreement: To add Phase 2 scope and fees.
FOR THE Additive Sum of: One Million three hundred five thousand four hundred dollars ($1,305,400.00).
Original Agreement Amount
$
$ 575.736.95
Sum of Previous Changes
$
$
This Change Order adds
$ 1.303.397.38
Present Agreement Amount
$
$ 1.879.134.33
The time for completion shall be increased by _Nt A_calendar days due to this Change Order.
Accordingly. the Contract Time is now L-J calendar days. The substantial completion date
is _N/A _ and the final completion date is N/A. Your acceptance of this Change Order shall constitute a
modification to our Agreement and will be performed subject to all the same terms and conditions as contained
in our Agreement indicated above, as fully as if the same were repeated in this acceptance. The adjustment, if
any. to the Agreement shall constitute a ful I and final settlement of any and all claims of the Contractor arising
out of or related to the change set forth herein, including claims for impact and delay costs.
Accepted: JtlM.f2-.. J 0 ,2009.
CONTRACTOR:
Post Buckley Schuh & Jernigan, Inc.
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_____ /" J '/ ' "'-',~'
/. /f ,4>1.,llt' "'''I, . '/, i/11/)'
Bv: I t,- I'" . / . /-/
. Elliot L. Grosh, P.E. .'
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OWNER:
BOARD OF COUNTY COMMISSIONERS
OF COLLIER COUNTY, FLORIDA
By: M~L ~JcL
Mac Hatcher, Project Manager
By:
DIVISION ADMrNISTRA TOR
Agenda Item No. 16A 10
June 23, 2009
Page 5 of 22
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1/ 'eph K. Schmitt
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CONTRACT SPECIALIST
By:
Lyn Wood
Date:
ATTEST:
BOARD OF COUNTY COMMISSIONERS OF
COLLIER COUNTY FLORIDA
Dwight E. Brock. Clerk
BY:
BY:
Donna Fiala, Chairman
Approved As To Form
and Legal Sufficiency:
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~1" 1f /(//c~~ L
Print Name: <; L-~ ff 12 --r; R r h
A33i3tMl County Attorney
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Agenda Item No. 16A10
June 23, 2009
Page 6 of 22
Collier County Watershed Model Update and Plan Development
Phase 2 Scope of Work
Watershed Management Plan Development
INTRODUCTION
Following is the proposed scope of work budget and schedule to develop the watershed
management plans for Collier County.
SCOPE OF WORK
The proposed scope of work for this project has been divided into seven (7) work elements, as
described below. Individual watershed management plans will be developed for each of the
three highest priority watersheds: Cocohatchee-Corkscrew, Golden Gate, and Rookery Bay.
However, proposed projects identified by others in the Faka Union, Okaloacochee I SR 29, and
the Fakahatchee basins that may impact other watersheds, will be considered for impact
analysis to all affected watersheds.
ELEMENT ELEMENT DESCRIPTION
1 , Assessment of Existing Conditions - Watersheds
2 Assessment of Existing Conditions - Estuaries
3 Development of Performance Measures
I 4 Analysis of Alternatives and Recommendations
5 Public Involvement
6 Watershed Management Plan Reports
7 Project Management and Meetings
Following are descriptions of the tasks included in each work element.
Element 1: Assessment of Existing Conditions - Watersheds
In this element, the PBS&J/DHI team will conduct a detailed assessment of existing conditions
for the three highest priority watersheds in Collier County: Cocohatchee-Corkscrew, Golden
Gate, and Rookery Bay. The assessment will encompass surface water, groundwater, and
natural system conditions and will be completed individually for each of the priority watersheds.
In addition, an assessment of existing conditions based on literature review will be conducted
for the Faka Union, Okaloacochee / SR 29, and Fakahatchee basins. The assessment will
include comparisons of existing conditions (including existing conditions model results) against
the Performance Measures identified in Element 3 to identify both watershed problems and
potential opportunities. The element tasks are described below. In must be noted that the items
related to water reservations and minimum water levels in Element 1 Tasks 1.1 and Element 3
Task 4 will require a separate Notice to Proceed due to an incomplete assessment related to
pending permits. County Manager approval will be necessary to issue these Notices to Proceed.
Agenda Item No. 16A 10
June 23, 2009
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Task 1. Surface Water
The assessment of existing conditions for surface water will include water quantity, water
quality, and pollution loads as well as a detailed water quality model for the Gordon River based
on the ECO Lab software.
Task 1.1 Water Quantity
The assessment will include the items described below.
. Water Budgets and Seasonal Water Levels. The Phase I scope of work for this
project includes comparisons among of the results from the Big Cypress Basin Project
Implementation Report (BCB PIR) MIKE SHE model, the BCB Natural Systems model
(BCB NSM), and the BCB Future Conditions Model (BCB FCM). The effort focuses on
comparing predicted flows to the estuaries and average wet and dry season water
levels. Work on this project phase will encompass adding to the comparison the results
of the MIKE SHE model currently being updated.
. Water Reservations and Minimum Water Levels. The PBS&J/DHI team will compare
model results and existing targets that have been developed to manage water levels
and uses within Collier County. As indicated above, this Task will require a separate
Notice to Proceed due to an incomplete assessment related to pending permits.
County Manager approval will be necessary to issue the Notice To Proceed. Specific
issues to be addressed include:
. Water Reservations - A water reservation is a legal mechanism to set water aside
from consumptive use for the protection of fish and wildlife or public health and
safety. The reservation represents the quantity of water to be protected from
consumptive use and includes seasonal and location components. The
PBS&J/DHI will review the water reservation targets for Picayune Strand and
compare it to model results and determine current conditions relative to targets.
. Minimum Water Levels - Minimum water levels for the aquifers are established
to define levels required to protect water resources in an area. The PBS&J/DHI
team will review the existing minimum level requirements defined for the Lower
West Coast Aquifer system. The team will also seek to identify the key
characteristics that will be considered during development of an MFL for Rookery
Bay (scheduled for 2011). The information will be compared against model results
to determine the current conditions relative to the established targets.
. Flood Risk - The PBS&J/DHI team will use the results of the levels of service and
storm event analyses included in the current project phase (per Element 3, Tasks 13
and 14) to assess flood conditions at identified representative locations within each of
the watersheds. Flooding conditions outside of designated Conservation Lands will be
considered in the development of alternatives.
. Conveyance System and Structure Operations - In this analysis, the PBS&J/DHI
team will evaluate model results to identify areas where culverts or other structures
restrict conveyance. The assessment will also identify conveyance restrictions
resulting from the current operations of the water control structures.
Agenda Item No. 16A 10
June 23, 2009
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· Sensitivity of Modeled Conveyance Parameters - This item will be used to evaluate
the sensitivity of the hydraulic system to changes in hydraulic conveyance parameters
such as roughness coefficients.
· Regulatory Environment - The PBS&J team will evaluate the existing state and local
stormwater regulations and assess the impacts of the proposed stormwater rules.
Task 1.2 In-Stream Water Quality
Given time constraints, data limitations, and lack of specific familiarity with local conditions,
there are occasions when the listing and de-listing stages of the TMDL process contain errors.
If errors in impairment identification are not fully recognized, the TMDL process proceeds to the
next step, that of TMDL development. For those systems where "impairment" does not
accurately reflect the ecological health of the system in question, TMDL development can
involve a considerable expenditure of time and resources for a system not necessarily needing
such attention. A refined understanding of water quality conditions will be the basis for the
development of site-specific and locally-relevant protection and/or restoration strategies.
To address these concerns, the PBS&J/DHI team will provide Collier County with the following
services as they relate to the highest priority watersheds:
· Review of all data, both within IWR and in other databases, related to verified and
planning lists for Collier County's watersheds.
· Review relevant reports from the SFWMD, FGCU, and others as they relate to target
setting for natural resources dependent upon maintenance of adequate water quality
(Le., oysters, seagrass, etc.).
· Identification of potential conditions and/or locations where "impairment" is possibly
related to natural conditions of the physical setting of the WBID itself.
· Determination of likely nutrient responsible for phytoplankton growth via three
techniques: TN: TP ratios, comparison of regression coefficients when examining
nutrient vs. chlorophyll-a relationships, and quantification of the percent of TN and TP
remaining in an inorganic fraction, as related to chlorophyll-a levels.
· Based on the above steps, a determination of the nutrient most likely responsible for
phytoplankton growth.
· Dependent upon the availability of data and the appropriateness of such a step,
develop alternative criteria for nutrients, as related to appropriate chlorophyll-a target.
· When possible, development of conceptual models that explain the observed water
quality will be assessed.
Task 1.3 Pollutant Loading
A pollutant loading model will be developed for each of the highest priority watersheds to
estimate loads associated with the NPDES parameters. Loads will be estimated for each model
grid cell in the MIKE SHE model. Results will then be aggregated by watershed as well as by
Agenda Item No. 16A 10
June 23,2009
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identified subwatersheds of interest to the County. A period of rainfall that best represents
average annual conditions will be identified from the historical record and flows for this period
will be assumed to be representative of average annual conditions. Pollutant concentrations
associated with surface runoff by land use category (event mean concentrations or EMCs) will
be obtained from the County's NPDES data. If these data are not available, literature values will
be used. Loads associated with atmospheric deposition will be assumed to be included in the
reported EMCs. Average annual point source loads will be added to the model based on their
grid cell location.
The SWFFS pollutant loading model results will be used to assess conditions in the Faka Union,
Okaloacochee / SR 29, and Fakahatchee basins.
Task 1.4 ECO Lab Water Quality Modeling of Golden Gate Canal System
A detailed water quality model based on the ECO Lab software will be developed for the Golden
Gate canal system, including the Gordon River. The model will be used to a) provide a better
understanding of potential impairment conditions in the water body, and b) assess the benefits
of potential improvement projects in the watershed. In addition, the proposed model will serve
as a pilot project to assess its applicability to other watersheds, canal systems and water bodies
in the County that have similar hydrologic characteristics.
The development of the WQ model will start by creating a higher-resolution hydraulic/
hydrodynamic (H&H) MIKE SHE/MIKE 11 model for the Golden Gate watershed from the
developed Collier County model, which will serve to establish the boundary conditions. Where
applicable, higher resolution details of the drainage system will be added into the local scale
model.
The model will combine the physically based spatially distributed hydrodynamics derived from
MIKE SHE with the numerical ecological model ECO Lab. ECO Lab is a generic and open tool
for customizing aquatic system models to describe water quality and eutrophication. The ECO
Lab eutrophication template describes the physical, chemical and biological processes from
various sources such as urban and agricultural runoff and various physical conditions such as
sediment processes and pollutant loads.
The eutrophication model describes nutrient cycling, phytoplankton and zooplankton growth,
growth and distribution of rooted vegetation and microalgae in addition to simulating oxygen
conditions. The model results describe the concentrations of phytoplankton, chlorophyll-a,
zooplankton, detritus, organic and inorganic nutrients and oxygen. In addition a number of
derived variables are stored: primary production, total nitrogen and phosphorous
concentrations, sediment oxygen demand and turbidity.
The eutrophication model is integrated with the advection-dispersion (AD) component at each
grid cell of the model, based on land use. The AD module will transport dissolved pollutants in
the overland, drainage (interflow), and ground-water model components. Decay rates and the
solubility limits will be established in the overland layer. Decay and sorption processes will be
simulated in the ground-water layers.
The MIKE SHE AD module exchanges directly pollutants with the rivers, canals, and lakes in
MIKE 11. Once they reach the surface water system in MIKE 11, pollutants from those non-
point sources and from other point sources are transported in the rivers and lakes by the MIKE
Agenda Item No. 16A 10
June 23,2009
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11 AD module. ECO Lab will be coupled to MIKE 11 AD to incorporate the eutrophication
processes and simulate the biochemical and ecological fate of these pollutants.
Pollution loads will be an external model input and they will be determined consistent with Task
1.3. Point source discharge of pollutants of interest into the rivers and canals will be identified in
order to include them as boundary conditions in the MIKE 11 AD component.
The WQ model will be built and calibrated by adjusting model parameters inside their
uncertainty range to better match the available WQ monitoring data. It will be used to a) provide
a better understanding of potential impairment conditions in the water body, and b) assess the
benefits of potential improvement projects in the Golden Gate watershed. In addition, the
proposed model will be consider a pilot project to assess its applicability to other canal systems
and water bodies in the County that have similar characteristics.
Water quality modeling of the remaining watersheds will be analyzed based on the Golden Gate
model results as the success of the Golden Gate ECOLab modeling effort will provide
substantial insight into the modeling scope of additional water quality modeling in the County.
Additional water quality modeling may be considered as a follow-up project to this project
phase.
Task 2. Groundwater
The assessment of existing conditions for groundwater will include an analysis of hydrologic
conditions, water uses, water quality, and pollution loads.
Task 2.1 Hydrogeology
Water balance calculation from the MIKE SHE model results will be conducted to estimate the
incoming and outgoing water fluxes in the aquifers. Maps with the typical distribution of the
water balance components (including the recharge) will be generated for two times of the year
corresponding to dry and wet conditions. Head drawdowns will be used to indicate areas of
intensive / excessive pumping. Head maps will be generated for the different aquifers
corresponding to dry and wet conditions. Planning implications may include such factors as
protection measures for groundwater recharge areas or suggested reduced pumping in areas
where impacts to wetlands may be predicted. Conversely, modeling results may indicate the
best places to locate new water supply wells, while minimizing other impacts.
Task 2.2 Water Uses
This subtask will include the two items discussed below.
· Water Supply (Municipal and Domestic Self-Supply).
The PBS&J/DHI team will conduct a water supply analysis involving water balance calculations
to assess the quantity of water being extracted from each aquifer and the use of that water,
such as private wells, public supply, or agriculture. Maps depicting the spatial distribution for
each type of groundwater source will be developed to include information of the County's water
supply system. This information will aid in determining what areas may be contributing to over
use of water supply resources and indicate what areas may be available to be added to the
municipal water supply system.
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June 23,2009
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. Irrigation (Agriculture, Golf Courses).
As with the potable water supply evaluation, water used as irrigation for agriculture and golf
courses will be evaluated. Detailed water balance calculations from the MIKE SHE model
results will be developed for each Irrigation Command Area and the golf courses to indicate the
quantity of water extracted from each aquifer and the use of that water. The groundwater
extraction rate predicted by the model for irrigation will be compared to permit limits to indicate
whether permit limitations are reasonable or likely to be exceeded. Seasonal variation of the
groundwater extraction rate will be also evaluated with respect to crop needs and permit
limitations.
Task 2.3 Groundwater Quality
The groundwater quality issues will be assessed by an analysis of wellhead protection zones.
These zones will be evaluated from MIKE SHE model results and current State and local
standards. Areas where results indicate an increased risk for contamination of water supplies or
transport of pollutants due to excessive withdrawal rates will be mapped and reviewed against
current well head protection practices. As in the water quantity budget analysis,
recommendations may come from the modeling results as to the best way to minimize water
quality impacts induced by land use practices or excessive water supply production.
Task 2.4 Pollutant Loading
Pollutant loads associated with groundwater will be calculated as the product of the modeled
groundwater flow and groundwater quality data available from local monitoring programs. A
general assessment of pollutant loading that may be associated with septic tank groundwater
recharge will also be conducted for those areas with large numbers of active septic drainage
systems. The assessment will rely on established septic contributions of pollutants based on
technical literature reviews. Maps depicting areas where septic tank recharge is conceptualized
in the model will be developed.
Task 3. Natural Systems
The existing areal extent and functional quality of native wetland and upland communities will be
assessed for each of the three primary study basins using a combination of methods.
Task 3.1 Reference Period Comparison
A reference period was identified as part of the SWFFS. The land cover associated with this
period was derived from 1940 vintage aerials and the first soil survey and is available for this
project. From this information, it is possible to discern historic hydrologic conditions by mapping
the extent of hydric soils and other soil indicators. Such soil indicators are also strongly
correlated with the distribution of native plant communities.
Once a spatial database has been developed for historic native plant communities, it will be
possible to conduct a quantitative change analysis using current GIS land use cover data
available from SFWMD. This will be done using a digital overlay process that generates a table
that quantifies from/to changes in land use and cover (e.g., cypress swamp to row crops). For
each primary basin GIS maps and tables for the reference and current periods will be prepared.
Agenda Item No. 16A 10
June 23, 2009
Page 12 of 22
From this analysis, it will be possible to quantitatively estimate the losses and conversions of
native plant communities and habitats over the past 50-60 years. This information will then be
used to develop defensible performance standards and restoration targets.
Task 3.2 Functional Assessment
Using the wetland areal extent information developed in task 1,3.1, the PBS&J/DHI team will
conduct a landscape-level functional assessment of native wetland and upland communities.
This will be accomplished using a modified approach to the Uniform Mitigation Assessment
Method (UMAM - 62-345 Florida Administrative Code). This method involves a quantitative
scoring approach to assessing three primary metrics:
· Location and landscape support (e.g., adjacent development; loss of connectivity).
· Water environment (e.g., hydrologic alterations; water quality degradation).
· Community structure (e.g., presence of exotics).
A scoring procedure will be conducted for each mapping unit in each of the primary basins,
summed across the basin, and then averaged per unit area, to develop an overall basin score.
This quantitative approach will allow for meaningful comparisons of the relative functional quality
of wetland and other native habitats between basins. In addition, the approach is codified in
Florida law and well accepted as a quantitative functional assessment method,
The scoring process will be conducted primarily through a review of mapping materials and
model output (e.g., water levels), but will be supported by limited field groundtruthing. A total of
four man-field days (e.g., two ecologists in the field for two days) will be dedicated for each
primary basin to assess and confirm conditions on the ground. This level of analysis would not
be acceptable for project permitting. However, it is appropriate for regional planning.
The functional assessment will provide a quantitative measure of the relative loss of wetland
functions in the subject basins. In addition, from the spatial comparison of land use/cover
between the reference period and current conditions it will be possible to quantify other
landscape changes such as:
. Conversion of native uplands to:
o Urban land uses (e.g., impervious surface);
o Agricultural land uses (e.g., ditching & draining).
· Dredged coastal areas.
· Filled coastal areas.
. Major changes to coastal circulation patterns (e.g., causeways).
These factors will be integrated into an anthropogenic disturbance index that will allow for a
comparison of the relative level of man-induced impacts between basins and receiving waters.
Task 4. Deliverables
The deliverable for this task will be a summary report describing the results of the existing
conditions analyses, both from a countywide perspective as well as for each of the three highest
priority watersheds. The report will also include a description of existing conditions in the Faka
Union, the Okaloacochee / SR 29, and the Fakahatchee watersheds. Assessments will be
based on comparisons of existing conditions and Performance Measures. Descriptions will
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June 23, 2009
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follow the task format: surface water, groundwater. The deliverable will also include the
generated GIS databases associated with the work performed.
Element 2: Assessment of Existing Conditions - Estuaries
The objective of this element is to characterize existing conditions in the estuarine receiving
waters of discharges from the major basins addressed in this scope of work. This
characterization will be accomplished primarily through a synthesis of existing information.
Similar to the assessment of existing watershed conditions, problems and/or opportunities will
be identified by comparison to the Performance Measures. The four primary estuaries to be
addressed include: Wiggins Pass, Naples Bay, Rookery Bay, and Ten Thousand Islands. This
effort will include five (5) tasks as described below.
Task 1. Volume and Timing of Freshwater Inflows
The objective of this task is to characterize the volume and timing of freshwater discharges
delivered to the receiving water estuaries. The PBS&J/DHI team will obtain, and consolidate
into a single database, all available streamflow data for tributary inflows as depicted by the
MIKE SHE model into the four estuaries of concern. Existing streamflow databases will be
inventoried for applicable data, including:
. USGS gauged flow records.
. SFWMD DBHydro.
. Other sources (e.g., University studies; permit files; etc.).
For each primary tributary, flow statistics for the period of record will be developed including, but
not limited to, the following:
. Time series plots of daily flows.
. Average annual minimum, maximum, mean and median flows.
. Average monthly minimum, maximum, mean and median flows.
. Average wet season minimum, maximum, mean and median flows.
. Average dry season minimum, maximum, mean and median flows.
. Other statistical summaries as supported by the data.
An attempt will be made to identify inflection points in the time series plots which could
correspond to major hydrologic changes in each of the primary tributaries (e.g., impoundments;
ditching and draining; land development, etc.). The flow conditions that existed prior to the
inflection point could be considered to be a reference or benchmark period representing more
natural conditions. If supported by adequate flow data, the PBS&J/DHI team will conduct
statistical change analyses comparing flow conditions that existed pre- and post of any major
hydrologic alterations. If pre-development flow data are not available, or are not adequate to
discern a reference period flow regime, then flows generated from the SWFFS Natural Systems
Model will be used to estimate pre-development flow conditions.
The volume of freshwater discharged from each watershed into the receiving estuaries will be
evaluated from the MIKE SHE model results. Conclusions will be drawn to associate impacts
with the hydrologic characteristics of each watershed. In addition, the Index of Hydrologic
Alteration (IHA) software, or other comparable analytical methods, will be used to compare pre-
and post flow statistics and conditions. This analytical approach comparing pre- and post
Agenda Item No. 16A 10
June 23,2009
Page 14 of 22
hydrologic alteration time periods will be subsequently used to develop performance standards
for freshwater inflows.
Task 2. Quality of Discharge
The objective of this task is to characterize the water quality of freshwater discharges and
pollutant loads delivered to the receiving water estuaries. The PBS&J/DHI team will obtain, and
consolidate into a single database, all available water quality data for tributary inflows into the
four estuaries of concern. Existing water quality databases will be inventoried for applicable
data, including:
· EPA (STORET).
· USGS.
· SFWMD DBHydro and other data sources.
. FDEP.
· Collier County.
· Lee County.
· Other sources (e.g., University studies; permit files; etc.).
Available data will be consolidated into a single database using SAS software. Appropriate
statistical analysis of the data will be conducted (e.g., ranges, means, standard deviations,
trends, etc.). Statistical summaries will be developed for each station and tributary. Where
applicable, the summary date will be compared to appropriate regulatory standards and/or
statewide averages.
By combining volumetric flow data developed in Tasks 1 with concentration data developed
under this task, annual and seasonal pollutant loadings will be estimated for critical parameters
related to coastal eutrophication, water quality impairment, and the loss of natural functions.
Critical parameters will include:
· Total nitrogen.
· Total phosphorus.
· Total suspended solids.
· Color.
. Bacteria.
WBIDs identified in the State 303(d) listing as impaired, as well as other notable water quality
problem segments, will be mapped. In addition, water quality conditions in each tributary will be
summarized.
Task 3. Quality of Receiving Waters
The objective of this task is to characterize the water quality conditions in the receiving waters of
each of the four estuaries of concern. As with task 2, the PBS&J/DHI team will obtain, and
consolidate into a single database, all available water quality data for estuarine receiving waters
in the four estuaries. Existing water quality databases will be inventoried for applicable data,
including:
· EPA (STORET).
· USGS.
Agenda Item No. 16A10
June 23, 2009
Page 15 of 22
. SFWMD DBHydro and other data sources.
. FDEP.
. Collier County.
. Lee County.
. Other sources (e.g., University studies; permit files; etc.).
Available data will be consolidated into a single database using SAS software. Appropriate
statistical analysis of the data will be conducted (e.g., ranges, means, standard deviations,
trends, etc.). Statistical summaries will be developed for each station and tributary. Where
applicable, the summary date will be compared to appropriate regulatory standards and/or
statewide averages for critical parameters related to coastal eutrophication, water quality
impairment, and the loss of natural functions. Critical parameters will include:
· Chlorophyll-a.
. Dissolved oxygen.
. Transparency.
. Bacteria.
WBIDs identified in the State 303(d) listing as impaired, as well as other notable water quality
problem areas, will be mapped. In addition, water quality conditions in each estuary will be
summarized.
The quality of freshwater discharged from each watershed into the receiving estuaries will be
evaluated from the pollutant loading model results. Conclusions will be drawn to associate
quality in the receiving water bodies with the pollution loads from each watershed.
Task 4. Coastal Habitats
The objective of this task is to address the loss of natural functions in the four estuaries of
concern, primarily through a review of existing literature. In general, the literature indicates that
these estuaries have been impacted by hydrologic alterations in their watersheds. The timing
and volume of freshwater discharges to the estuaries have been significantly altered from
natural conditions, with the primary problem being the delivery of too much freshwater. As a
result, the historic areal extents of oyster bars and seagrass beds have been reduced by salinity
alterations, shading, and smothering.
The PBS&J/DHI team will conduct a literature review of water quality and living resource studies
addressing the four estuaries of concern. Considerable work has been performed by the USGS,
NOAA, FDEP Fish & Wildlife Research Institute, SFWMD, and Florida Gulf Coast University.
Key literature addressing in-bay water quality and the distribution of living resources will be
inventoried and summarized. If supported by adequate data, GIS maps will be prepared
showing both the historic and existing areal extents of the following submerged and emergent
coastal habitats:
. Oyster bars.
. Seagrass beds.
· Mangrove forests.
. Salt marshes.
. Salt barrens.
. Coastal beaches (Marco Island).
Agenda Item No. 16A10
June 23. 2009
Page 16 of 22
An appropriate reference period when more natural conditions existed will be identified. If
supported by the data, an attempt will be made to conduct a quantitative change analysis of the
areal extent of the coastal habitats listed above, comparing reference period conditions to
existing conditions. This analysis will be conducted using GIS overlay techniques. In addition,
the Natural Systems Model (SOl, 2007) developed for the Southwest Florida Feasibility Study
will be evaluated for use in this effort.
A narrative report will be prepared summarizing the water quality and coastal habitat analysis.
Task 5. Deliverables
The deliverable for this task will be a summary report describing the results of the existing
conditions analyses and comparison to the Performance Measures for the four estuaries. The
report will address the relationships of the estuaries and the contributing watersheds. A
qualitative - and where feasible, quantitative - assessment of the loss of natural functions in
each of the four estuaries of concern will be developed. In addition, each of the four estuaries
will be compared to each other with respect to the degree of alteration. This analytical approach
will be subsequently used to develop performance standards for coastal habitats. A summary of
conditions in Marco Island and the beaches will be included as part of Rookery Bay.
Oeliverables will also include the GIS databases associated with the work performed.
Element 3: Development of Performance Measures
To evaluate the relative importance associated with an existing problem, and gain insight into
the applicability and feasibility of specific alternative analyses, performance measures will be
established. Performance measures are quantitative indicators of how well proposed alternative
scenarios meet specified objectives. They will be established and used to evaluate potential
problem areas within each basin prior to the identification of proposed improvement scenarios.
They will be setup to address the same issues associated with the assessment of existing
conditions, surface water, groundwater, and natural systems. Performance measures will be
based on the natural system conditions and/or goals established by the County.
Task 1. Water Budgets and Seasonal Water Levels.
This performance measure addresses the changes in water budgets and seasonal water levels
compared to both existing and natural system conditions.
Task 2. Freshwater Discharge to Estuaries
This performance measure will include the four estuaries, Wiggins Pass, Naples Bay, Rookery
Bay, and Ten Thousand Islands. The performance of a proposed scenario will be determined by
comparing the model simulation results for that scenario with both the natural condition, as
determined from the historical record per Element 2 Task 1, and the existing condition, as
determined from the existing conditions model runs.
Task 3. Pollutant Load
The pollutant loading model results for existing conditions (Element 1, Task 1.3) will be
compared to expected pollution loads associated with the proposed alternative scenarios. The
Agenda Item No. 16A 1 0
June 23, 2009
Page 17 of 22
performance measures will consider that pollution reductions expected at impaired or
significantly impacted subbasins are preferred over pollutant reductions at less impacted
subbasins.
Task 4. Water Reservations and Minimum Water Levels
For this performance measure, the PBS&J/DHI team will compare existing conditions model
results with existing targets, such as the proposed water reservation targets for Picayune Strand
and minimum water levels that have been established for the aquifers.
Task 5. Flood Risk
Key locations within each watershed that are representative of flooding conditions, as described
for existing conditions, will be used as baseline for comparison of impacts resulting from
alternative improvement scenarios.
Task 6. Aquifer Recharge I Yield
This performance measure will focus on issues related to groundwater recharge and aquifer
yield. Targets specified in the document entitled "Proposed Minimum Water Level Criteria for
the Lower West Coast Aquifer System within the South Florida Water Management District" will
be used as the baseline comparison.
Task 7. Natural Systems
The development of performance measures for wetlands and native habitats will be based
largely on the results of Element 1, Task 3. A quantitative assessment of the loss of wetlands
and other native plant communities will be developed. In addition, a quantitative functional
assessment under current conditions will be prepared. Through a comparison of historic and
current conditions, quantitative targets for restoration of both areal extent and functional quality
will be developed.
Element 4: Analysis of Alternatives and Recommendations
As described for Element 1, the PBS&J/DHI team will compare the existing condition of each
watershed against the defined Performance Measures. Subsequently, a broad list of potential
solutions to problems will be identified and evaluated. This element will also consider watershed
stressors resulting from future development such as increased water demands. The Element
tasks are described below.
Task 1. Identification of Potential Projects, Future Watershed Stressors, and Policies
The objective of this task is to compile the information of existing watershed problems, future
problems that may result from future development, potential solutions that have been identified
through previous work, and potential solutions resulting from the analyses conducted as part of
this project. Potential solutions would include projects that have been previously indentified in
previous work including the Southwest Florida Feasibility Study (SWFFS), Belle Meade Area
Stormwater Management Master Plan, Immokalee Storm Water Management Plan, South Lee
Agenda Item No. 16A 10
June 23,2009
Page 18 of 22
County Watershed Management Plan, and other recent basin master plans. Projects will also
include the water supply projects identified in the Lower West Coast Water Supply Plan
(LWCWSP). Non-structural/management and structural projects will also be identified and
proposed by the PBS&J/DHI team in coordination with Collier County and other local
stakeholder groups. In addition, the PBS&J/DHI team may identify other potential projects or
opportunities that have not been previously considered. Potential projects will be identified
specifically for each watershed and may include the following types:
Task 1.1 Non-Structural/Policy
· Structure operations.
· Water use management.
· Land acquisition for restoration/conservation.
· Land development practices.
· Water use regulations (rates, reuse, irrigation practices, etc).
· Best Management Practices (BMPs).
Task 1.2 Structural Improvements
· Culvert or bridge replacement.
· Water diversion.
· Restoration.
· Water Conservation Areas.
. Aquifer Storage and Recovery.
· Salt Water Intrusion Protection (injection wells/cutoff walls, etc.).
· Other BMPs.
The PBS&J/DHI team will deliver a GIS database of proposed projects similar to that developed
for the SWFFS. A conceptual description of each will be provided.
Task 2. Initial Screening of Proposed Projects
For this task, the PBS&J/DHI team will conduct a screening level analysis of the potential
projects by comparing expected benefits to the Performance Measures and by estimating
project performance under full build-out conditions. The evaluation of the projects will also
include preliminary estimates of implementation costs as well as permitability and
constructability. Constructability reviews will be conducted to make sure projects can be
physically implemented. The objective of the task will be to eliminate from further consideration
potential projects and policies that are judged to be impractical or that will provide little benefit to
the County.
Task 3. Development and Analysis of Alternative Scenarios
For this task, the PBS&J/DHI team will assemble alternative scenarios consisting of a
combination of watershed conditions under various development scenarios and improvement
projects. Development scenarios will include watershed stressors and proposed projects
resulting from Task 2. As indicated previously, watershed stressors are conditions that may
result from future development such as increased potable water demand and impact to
recharge areas. The identified scenarios will then be subject to a more detailed evaluation
Agenda Item No. 16A10
June 23, 2009
Page 19 of 22
based on comparisons to the performance measures. The work will include the following
subtasks.
Task 3.1 Set up Alternative Scenarios
Proposed projects (non-structural and structural) will be grouped by watershed, functional
criteria, perceived benefit and cost to create alternative improvement scenarios. Each scenario
may assume implementation of the projects identified in the SWFFS Tentatively Selected Plan.
It is estimated that 8 to 10 Alternative Scenarios will be selected for detailed evaluation. A
hierarchy of relative importance/feasibility will be established to improve the overall efficacy of
the alternative analysis process. Examples of such scenarios may include addition of proposed
well fields, construction of storage reservoirs, converting of agricultural lands to urban, or
restoration of farmland to natural conditions. The most cost effective and feasible projects will
be considered first and verified by specific alternative simulations.
Task 3.2 Run Model Simulations
Those feasible and cost effective scenarios will be simulated to determine the impacts of
proposed projects with respect to the Performance Measures. Each scenario will be modeled to
define its characteristics in terms of surface water, groundwater, and natural systems.
Task 3.3 Evaluation of Alternative Scenarios
The benefits of each scenario will be evaluated with respect to its estimated contribution to
meeting the Performance Measures. In addition, implementation cost estimates, both capital
and operation and maintenance, will be developed for each scenario. Permitting requirements
and public acceptance will also be important components of the evaluation process.
Task 4. Selection of Recommended Watershed Management Actions
The product of the evaluation of alternative scenarios will be a ranking of the evaluated
scenarios and a recommended scenario consisting of a set of projects to be implemented at
each watershed. The recommendations will include implementation costs and a project
implementation sequence.
Element 5: Public Involvement
Public involvement is an important component of the watershed management plan process to
obtain buy-in and support during plan development and implementation. For this project, the
PBS&J/DHI team will participate in two public meetings at each of the top priority watersheds:
. Meeting to present the results of the identification of potential projects and their initial
screening (Element 4, Tasks 1 and 2). This meeting will also be used to present to the
public the performance measures and describe the methodology to evaluate the
alternative scenarios.
. Meeting to present the alternative scenarios, results of a preliminary alternative
evaluation of those scenarios, and draft recommendations.
Aqenda Item No. 16A 10
- June 23, 2009
Page 20 of 22
Element 6: Watershed Management Plan Reports
The final product of this project will be the County's Watershed Management Plan. It will consist
of four reports, one for each of the top priority watersheds, Cocohatchee-Corkscrew, Golden
Gate, and Rookery Bay, and one for the Faka Union, Okaloacochee I SR 29, and Fakahatchee
basins. The reports will complement the previous deliverables and will describe the
methodology and findings associated with Project Elements 3 through 5, performance
measures, analysis of alternative projects, and recommendations. Draft reports will be provided
for County review. Comments provided by the County and other agencies will be addressed and
Final Report will be submitted. Draft and Final Reports will be provided in pdf format. One copy
of each will also be provided in hard copy format.
Element 7: Project Management and Progress Meetings
This element will include general project management and coordination activities, as well as
development of progress reports and invoicing. Each monthly invoice will be accompanied with
a brief progress report indicating schedule progression and any milestone accomplishments. All
progress meetings will be by conference call or Webex. The PBS&JIDHI team will also
participate in one meeting at the County offices.
PROJECT SCHEDULE AND BUDGET
This work associated with the proposed scope will be completed by April 30th 2010. A project
schedule by task is attached as Figure 1. It has been assumed that the Notice to Proceed will
be received by July 13th 2009. The cost estimated to complete the work is #1,303,397.38. This
cost includes a 5% mark-up on subconsultant work. The PBS&J labor rates are shown in the
attached Table 1. A detailed hourly cost breakdown is shown in the attached Table 2,
Agenda Item No. 16A 10
June 23, 2009
Page 21 of 22
TABLE 1
PBS&J Labor Rates
Collier County Watershed Model Update
and Plan Development RFP #08-5122
Labor Multiplier:
3,0
I:,': >".:.' {:'> ..'...',.....> ',.."..." ,/.7:,L BURDENED LABOR
('ZiT;.:"J .' :.':f., . ."..'.>>,: ::,.:i RATES ($/HR) ,
Technical Director 200.00
Project Manager 185.00
Deputy Project Manager 158.00
Sr. Engineer III 131.00
Sr. Engineer II 109.00
Sr. Engineer I 99.00
Engineer II 86.00
Engineer I 72.00
GIS Project Manager 142.00
GIS Sr. Professional I 135.00
GIS Professional II 105.00
GIS Professional I 79.00
Sr. Planner 122.00
Planner II 88.00
Planner I 79.00
Sr. Environmental Scientist III 152.00
Sr. Environmental Scientist II 112.00
Environmental Scientist/Ecologist 89.00
Staff Environmental Scientist 69.00
Sr. Hydrogeologist 159.00
Hydrogeologist II 111.00
Hydrogeologist I 74.00
CADD Designer 56.00
Administrative Assistant 62.00
Clerical 46.00
Survey Field Crew 155.00
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