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2014-052 elTETRA TECH
June 13,2014
Mr.James Kinzler, CPM,EA
Director of Environmental Services
City of Clermont -
3335 Hancock Road
Clermont,FL 34711
Subject: City of Clermont
Groundwater Modeling Impact Analysis Technical Memorandum
Dear Mr.Kinzler
Tetra Tech is pleased to furnish this proposal for professional engineering and hydrogeological services
for simulation of water use permit pumping scenarios for the above-referenced project. The scope of
services and compensation summary are detailed below. This letter outlines a scope of services for tasks
related to evaluating the feasibility of increasing the yield of the City's existing facilities (wells) by
redistributing pumpage to minimize apparent impacts to Minimum Flow and Level (MFL) water bodies
Tasks proposed herein include
• Meetings or discussions with District regulatory staff regarding evaluation of changes of
pumpage distribution and source aquifer to benefit the City's total CUP allocation. Discussions
will focus on establishing methodology for the feasibility study that will be acceptable to the
District when later presented in support of a CUP application. We will collect information
regarding permitting consideration and acceptable levels of drawdown impact on MFLs near
Clermont.
• Review and evaluation of a numerical model proposed by the St Johns River Water Management
District (District) for use in review of consumptive use permit applications and impacts to MFL
lakes and wetlands Tetra Tech will review the suitability of the model to simulate Upper and
Lower Flondan aquifer pumping at the locations of the City's wells and suitability of the model
to simulate groundwater flow conditions at potentially affected MFL lakes and wetlands near
Clermont.
• Simulation of pumping scenarios to evaluate different distributions of pumpage that may increase
the City's total CUP allocation without an increase in apparent predicted impacts to MFL lakes
and wetlands,existing users, and other natural systems
• Preparation of a Technical Memorandum detailing the undertakings of the project The
memorandum will document the assumptions made in conceptualizing redistribution of pumpage
to reduce apparent impacts to MFL lakes and wetlands, data used in creating pumping scenarios,
the results of scenario simulations, and based on impacts to MFL wetlands and lakes,
recommendations regarding the feasibility of modifying the City's CUP to increase allocations
• Meetings to discuss preliminary or final results with the City.
Tetra Tech, Inc
201 E Pine Street,Suite 1000,Orlando,FL 32801
Tel 407 839 3955 Fax 407 839 3790 www tetratech corn
N-i] TETRA TECH Mr.James r
June 133, 201 2014
Page 2
In preparing this proposal, we reviewed the allocations by well and water distribution subsystem in the
City's CUP and relied on other relevant information concerning hydrogeology and water use near the
City, and numerical simulation of groundwater flow conditions in central Florida.
We understand that time is of the essence and will provide you with a project schedule as quickly as
possible after receipt of approval to begin work. We estimate that meetings, data collection,
conceptualization of pumping scenarios, and completion of simulations will require approximately three
to five weeks following approval of the proposed scope of work. A draft Technical Memo will be
submitted to the City for review within 45 days from NTP. The proposed compensation for the Scope of
Services described herein will be billed on a lump sum basis with an initial upset limit of$20,700.00,
based on the attached compensation summary.
SCOPE OF SERVICES
Project Overview
Population growth has increased in the City of Clermont, and consequently, water use is projected to
exceed current District CUP allocation by 2017. Recent experience with the District suggests that the
District views apparent(simulated)drawdown impacts to the Lake Apshawa MFL as the limiting factor in
allocation of water from the Upper Floridan aquifer in south Lake County. Some of those apparent
impacts may be reduced by moving pumpage from areas where pumpage is simulated as having a large
effect at the Lake Apshawa MFL to areas where the apparent impact is less Because pumpage from
deeper portions of the Floridan aquifer may have lower impacts on lakes and wetlands, it may also be
possible to increase net pumpage by shifting withdrawals from Upper Floridan aquifer wells, such as at
Grand Avenue, to Lower Floridan aquifer wells, such as at Greater Hills. These and other scenarios will
be investigated to identify pumping scenarios that may allow the District to increase the City' CUP
allocation
Task 1-Model Inspection
Tetra Tech will contact James Hollingshead, SJRWMD Supervising Hydrologist,to confirm which model
or models are acceptable for assessing apparent impacts of proposed City groundwater pumpage. The
most suitable model will be inspected to evaluate model calibration in the vicinity of City wells and
nearby MFLs. The distribution and magnitude of aquifer hydraulic properties will be evaluated for
consistency with current observations and hydrogeologic conditions. The depths to aquifers and
confining beds as simulated in the model will be evaluated at each City well site. Based on these and
other considerations, Tetra Tech will review the suitability of the model to simulate Upper and Lower
Floridan aquifer pumping at the locations of the City's wells and suitability of the model to simulate
groundwater flow conditions at potentially affected MFL lakes and wetlands near Clermont
Task 2-Impact Analysis
Tetra Tech will simulate several pumping scenarios to evaluate different distributions of pumpage that
may increase the City's total CUP allocation, apparent predicted impacts to MFL lakes and wetlands,
existing users, and other natural systems Simulations will include evaluation of the apparent impact of
each well in the City's system on nearby MFLs, simulation of the apparent single-well impact of a well
located in the LFA at each site except Greater Hills, and simulation UFA and LFA pumping scenarios to
determine the apparent maximum pumpage that could be permitted, based on current District permitting
criteria.
TETRA TECH Mr.James r
June 133,201 2014
Page 3
Task 3-Technical Memorandum
Tetra Tech will prepare a Technical Memorandum detailing the assumptions, efforts, results, and
recommendations of the project. The memorandum will document the assumption made in
conceptualizing redistribution of pumpage to reduce apparent impacts to MFL lakes and wetlands, data
used in creating pumping scenarios, the results of scenario simulations, and based on impacts to MFL
wetlands and lakes, recommendations regarding the feasibility of modifying the City's CUP to increase
allocation.
Task 4-Meetings
Tetra Tech will meet with the District to discuss models suitable for simulating apparent impacts of
proposed City pumpage scenarios and possible CUP allocations. Meetings or discussions with District
regulatory will also include discussions regarding evaluation of changes of pumpage distribution and
source aquifer to benefit the City's total CUP allocation. We will try to establish methodology for the
feasibility study that will be acceptable to the District when later presented in support of a CUP
application. We will collect information regarding permitting consideration and acceptable levels of
drawdown impact on MFLs near Clermont. Tetra Tech will meet with the City to discuss preliminary or
final results,and to collect information needed for modeling
Deliverables
1. Groundwater Modeling Impact Analysis Technical Memorandum
ESTIMATED COSTS
Task Fee
Task 1 Model Inspection& Data Collection $2,660.00
Task 2 Impact Analysis 10,641.00
Task 3 Technical Memorandum 4,489.00
Task 4 Meetings 2,910.00
TOTAL Lump Sum(Task 1—4) $20,700.00
The estimated costs are provided in the above price summary table for your review. The scope of work
detailed above will be completed within the deliverable due dates described above, and the work can
begin within (3) days of approval of the scope of services. We appreciate the opportunity to continue to
provide our services to the City,and look forward to working with you on this project.
TETRA TECH Mr James r
June 133,,201 2014
Page 4
Very truly yours, Authorized By
Tetra Tech City of Clermont
Jon Fox, PE By 4/3 ____
Vice President /
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