2016-61 EZI TETRA TECH
September 9, 2016
Mr. Paul Roy
Environmental Services Director
City of Clermont
3335 Hancock Rd
Clermont, FL 34711
Subject: City of Clermont
Professional Engineering Services Proposal for the
East Side Water Reclamation Facility RIB Rerating
Tt# 200BP Gen/Clermont
Dear Mr. Roy:
Tetra Tech is pleased to furnish this proposal for professional engineering services to complete the
rerating of the RIBs at the East Site Water Reclamation Facility. A detailed scope of services,
compensation summary, and project implementation schedule are attached.
We look forward to serving the City of Clermont on this project. If you should have any questions, please
do not hesitate to contact me at 407-839-3955.
Very truly yours, Approval:
Tetra Tech City of Clermont
/D. Fox, P.E. By:
r ice President Typed Name: Gail L.Ash, ayor
Attachments Date: 13-2e)*
BAF/slh/BP/C lermont/RIB Rerati ng/Roy09091 6
C: Brian A. Foulkes, P.E., Tetra Tech
Tetra Tech
201 E.Pine Street,Suite 1000,Orlando,FL 32801
Tel 407.839.3955 Fax 407.839.3790 www.tetratech.com
ATTACHMENT A
SCOPE OF SERVICES
CITY OF CLERMONT, FLORIDA
EAST SIDE WATER RECLAMATION FACILITY
EWRF RIB RERATING
I. PROJECT DESCRIPTION
The City of Clermont(City) owns and operates the East-Side Water Reclamation Facility (EWRF) located
at 3335 Hancock Road. The facility has a Florida Department of Environmental Protection (FDEP) rated
capacity of 4.0 MGD annual average daily flow(AADF)and is considered a Category II, Class B facility. In
dry weather, the City uses the Public Access Reuse (PAR)for residential irrigation as the primary means
of disposal. For wet weather and reject conditions, the RIBs serve as a backup to the City's PAR. There
are a total of fifteen (15) RIBs located onsite with a total wetted area of 4.76 acres having a permitted
capacity of 0.750 MGD AADF. Future improvements to the EWRF include expansion from 4.0 MGD AADF
to 9.0 MGD AADF. In order to expand the EWRF,the RIBS must be rerated to accommodate the weather
and reject conditions at the expanded capacity.
Andreyev Engineering Inc. (AEI)performed a RIB Rerating and Feasibility Assessment and determined the
RIBs to have sufficient storage and disposal capacity for wet-weather and reject water at the buildout
capacity of 9.0 MGD. To rerate the RIBs soil testing, ground water modeling, and load testing will be
performed to support the Florida Department of Environmental Protection (FDEP) Permit.
The tasks to be completed for this project are further described herein and will be performed in accordance
with the City/Tetra Tech Continuing Contract and Agreement for Professional Engineering Services for
Public Works Projects dated December 9, 2014.
II. SCOPE OF SERVICES
Tetra Tech's and AEI's services include professional engineering services to perform a detailed
investigation, water balance modeling, and groundwater flow modeling services to re-rate and permit the
existing RIBs for up to 9.0 MGD of reject and wet weather storage and disposal.
Direct infiltration capacity and off-site mounding impacts will be verified through testing and more detailed
modeling. Load testing will be performed during the well development of the Sunburst LFA well.
Based on the load testing and modeling an alternative to the existing 15 RIB system will be explored during
final modeling and permitting to consolidate the 15 small RIBs into 2 or 3 large RIBs and increase the depth
of RIBs to 7 or 10 feet.This will allow better operation and management 8 of the RIBs,where each RIB can
be loaded for a week or longer before switching to the next RIB.
Services included are described in the tasks below.
Task 1 —Field Investigation, Data Collection and Testing
In general, the field investigation, data collection and testing phase will involve gathering and reviewing
information in support of the modeling and permitting effort. Services to be completed in this task are
described below:
1. Review flow records and groundwater level data for the last 2 to 3 years of operation. This includes
monitoring wells on-site and off-site, water level data from potable water wells collected by the City
and others,plant flow data, reclaimed water distribution and application areas,loading to the existing
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RIBs and any other flow or monitoring data that may be useful in the final evaluation of the overall
system.
2: Development of a load test plan for 2 existing RIBs. Coordinate the load test set up and provide part
time daily monitoring/inspection services-during the load test and recovery period.
3. Conduct an evaluation of the load test data to determine the limitations of the RIBs to infiltrate water,
if any. The resulting data will be used in the groundwater modeling to estimate time of soil saturation
and rate of vertical movement of water at the RIBs areas.
4. Drill 3 deep SPT borings in the areas of the existing RIBs to allow better characterization of the
shallow aquifer and identify any clayey soil layers that may affect the vertical infiltration at the RIBs.
These borings should be extended to the top of limestone or a minimum of 20 feet into confining
clay layers above the limestone. We expect these boring to be extended to a depth of about 150
feet below ground surface.
5. Collect soil samples for laboratory classification tests andatselect depths collect extra split spoon
samples to allow permeability testing on remolded soil samples. These will be needed for both the
modeling and FDEP permitting.
6. Set up a system-wide water balance model using FDEP's LANDAPP program and conduct water
balance analyses. The model will include the reclaimed water distribution system, delineation of
application areas and reclaimed demands. The water balance analyses are needed for permit
application and to provide an estimate of wet weather storage volumes to be used in the groundwater
modeling.
7. Establish the maximum allowable mounding of groundwater at various areas during full scale
operation of the RIBs.Generate maps and limitation of groundwater mounding data sets and submit
to the City for final review and approval. LIDAR will be utilized to determine ground elevation
surrounding the EWRF.
Task 2—Modeling and Hydrogeologic Report
In general,the modeling and hydrogeologic report will involve developing a model and report to support the
permitting effort. Services to be completed in this task are described below:
1. Develop a sub-regional groundwater flow model, starting with the ECF model sets and then refining
the grid and the local extent of the model boundaries. The site specific soils data will be used to
characterize the shallow aquifer system in the model and will be extrapolated for the areas off-site.
Initially, the Floridan aquifer system will be used as it exists in the ECF regional model.
2. Using the groundwater level data collected at on-site and off-site wells for the last 2 years,the model
will be calibrated to the best possible level of accuracy. Typically,there is not sufficient data to allow
adequate calibration of the model and certain assumptions must be made to complete calibration.
We expect that this will be the case for this project. However,the model will be sufficiently calibrated
to allow final modeling and permitting of the RIBs.
3. Once the model is adequately calibrated and reviewed and approved by the City,the final modeling
of the RIBs for storage and disposal of reject and wet weather effluent flows will be completed.Tetra
Tech will meet with City to review the modeling results. The modeling will be conducted first for the
existing RIBs without any changes. If the RIBs can store and dispose of the needed reject and wet
weather flows, then no further modeling will be needed. If the existing size or configuration of the
RIBs are found to be insufficient to store and dispose of the required flows, then the modeling will
be expanded to assess other configuration, size, depth or combined areas to achieve the desired
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capacity.Tetra Tech will meet with City to review the modeling results and RIB loading protocol prior
to preparing the draft hydrogeologic report.
4. Alternative configurations will include a hydraulic evaluations of the existing mains conveying water
to the RIBs and provide recommended modifications meet proposed loadings capacities. Site
grading figures and yard piping figures will be developed to support the FDEP permit. Construction
drawings for the proposed RIB improvements are not included in this scope and will be detailed in
the EWRF expansion, based on the permit figures.
5. Prepare draft and final hydrogeologic report with presentation of all data, analyses, water balance
modeling and groundwater modeling. This report will be adequate for submittal to the FDEP in
support of the permit application. Tetra Tech will submit the draft memorandum to the City for review
and comment. Tetra Tech will attend one(1) meeting with the City to review the report. Tetra Tech
will prepare a final technical memorandum to address City comments.
Task 3-Permitting
Tetra Tech will prepare and submit the permit applications and supporting documentation to the Florida
Department of Environmental Protection (FDEP) as required to obtain permits for the RIB rerating. All
permit application fees will be paid by the City. Tasks include the following:
1. Complete FDEP Permit Application Forms 1 and 2A for the proposed improvements as a "Major
Modification"to the existing facilities.
2. Respond to requests for additional information issued by FDEP. RAI responses include responding
to comments related to the geotechnical and hydrogeologic issues, such as clarification of the
geotechnical data submitted, rerunning the groundwater model for additional scenarios and
preparing a letter with responses to the RAI comments. If FDEP requires additional drilling or testing,
changing the groundwater model or use a different model,these services are not included within the
proposal and will require a separate authorization.
III. SCHEDULE
Estimate Time Cumulative Time
Task (Per Task) (After NTP)
Field Investigation, Data Collection and 5 months* 5 months
Testing
Modeling and Hydrogeologic Report 2 months 7 months
Permitting 2 months 9 months
*Sunburst LFA 7 day load test proposed in March 2017
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IV. COMPENSATION
The lump sum compensation for the Scope of Services described in Section II is summarized below. A
detailed breakdown of the estimated compensation for the Scope of Services is presented in Attachment
B.
Task Total
Task 1 -Field Investigation, Data Collection and Testing $33,564
Task 2-Modeling and Hydrogeologic Report $54,728
Task 3-Permitting $10,939
Total $99,231
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