HomeMy Public PortalAboutTO 2023-2 Sewer System Hydraulic Modeling_BargeTask Order No. 2023-2
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, Florida
April 4, 2023
This Task Order, effective the date last signed below, by and between City of Crestview, Florida
(City) and Barge Design Solutions, Inc. (Barge) for the Sewer System Hydraulic Modeling,
Phase 1 (Project) is in accordance with the terms and conditions of the Professional Engineering
Continuing Services Contract dated May 11, 2021, as renewed/extended August 12, 2022, and
as amended January 9, 2023 (Agreement), all of which terms and conditions are incorporated
herein by reference.
The Project is described in Exhibit A — Scope of Services, attached.
For performance of the Project authorized under this Task Order, Client agrees to pay Barge for
time worked on the project by various personnel plus applicable outside services and other
expenses properly charged to the project in accordance with Exhibit B — Schedule of Standard
Charges. The estimated cost to perform the scope of work as defined in Exhibit A is estimated
to be $245,000.00. The budget status will be summarized monthly in our progress report and
invoice submittal.
City of Crestview, Florida Barge Design Solutions, Inc.
By: By:
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Title:
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Page 1 of 1
City of Crestview, Florida
Task Order 2023-2
Sewer System Hydraulic Modeling, Phase 1
Printed Kevin W. Kennoy
Name:
Title: Vice President
Address:
495 Grand Boulevard, Suite 206
Miramar Beach, FL 32550
Date Signed: April 10. 2023
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, FL
April 4, 2023
Barge Design Solutions, Inc. (Barge) is proposing the following scope of services for the City of
Crestview, Florida (Client) to provide hydraulic modeling and planning services for Phase 1 of the
Sewer System Hydraulic Modeling Project, in accordance with Task Order No. 2023-2. The scope
of work is presented in the following elements:
I. Project Description
II. Scope of Services
III. Project Schedule
I. Project Description
The City of Crestview Sewer Division manages and operates a wastewater collection,
transmission, and treatment system. The system is divided into four major basins that can
each be divided into subbasins that contribute flow to a pump station (see Figure 1).
Crestview currently has approximately 80 active lift stations and several planned or private
lift stations. Phase 1 includes providing sewer basin infrastructure planning support to map
lift stations and their contributing collection system, for a part of the system.
This "pilot" project will provide the Client with an updated GIS system with the known features
and a hydraulic model for a select part of the system, delineated as pump station basins that
can be used to evaluate the existing system (for superfluous inflows) and help the Client plan
for the future. The project also includes developing sewer improvement projects for the Pump
Station #10 basin and providing support for planning sewer capacity improvement projects to
support long-term growth.
Discussions with the Client and review of the Client's existing GIS information have been the
sources of information for determining the tasks and estimated level of effort for this task
order. Given the preliminary nature of the information, the level of effort may change as new
information is obtained. The budget status will be summarized monthly in our progress report
and invoice submittal.
II. Scope of Services
The scope of services is summarized into the following major tasks:
Task 1 — Sewer GIS Review
Task 2 — Sewer Data Collection and Review
Task 3 — Pilot Model
Task 4 — Sewer Basin Infrastructure Plan Development
April 4, 2023
Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page of
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, FL
April 4, 2023
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April 4, 2023
Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL
Page 2 of 11
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, FL
April 4, 2023
The following sections provide a description of the purpose, activities, deliverables, and assumptions
anticipated for each of the tasks. Throughout the project, Barge will manage the activities of our staff
and subconsultants, coordinate monthly status meetings with the Client's staff, and submit monthly
invoices with updated schedules and cost projections as applicable.
Task 1 — Sewer GIS Review
This task will review the Client's GIS system and compare with industry standards. The
review will incorporate recommendations for improvements as well as recommendations for
incorporation of the GIS features under this Task Order. Barge will provide the following
services:
• Meet with Client staff to review its current GIS (to take place during the project kickoff
meeting).
• Evaluate the GIS databases and provide recommendations for structuring, security,
reliability, and future additions.
Meetings:
The following meetings will be conducted as part of this task:
• Initial GIS review meeting
Deliverables:
The following deliverables will be provided as part of this task:
• Presentation of findings and recommendations for data collection schema
Task 2 — Sewer Data Collection and Review
To begin the process of updating the information for the basin evaluation and sewer modelling
activities, it is important to gain an understanding of the sewer network layout and Client
operational preferences and strategies.
• Barge will review received data including:
o GIS files
o Record drawings
o Pump station records
o Daily Monitoring Report (DMR) records
o Billing records (in conjunction with the records received for the water model)
o Land use maps
o Planned developments
April 4, 2023
Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page 3 of 11
84AR_ (7411f
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, FL
April 4, 2023
After reviewing infrastructure and operational data, Barge will assess data gaps impacting
future tasks. Additional data required will be flagged for collection. This Task Order is based
on an assessment of the service area of Pump Station #10, however, if possible, additional
data may be collected if permissible within the project budget.
As part of this task, Barge will collect information for sewer system features within the Pump
Station #10 service area as required for the assembly of the model, including installed
metered data for up to three pump stations that feed Pump Station #10. Barge will propose
a basin delineation for this pilot area for review with the Client prior to beginning the data
collection task. The data collection task includes the following activities:
1. System connectivity and attributes will be developed by collecting data on the
sewer system manholes and structures necessary to complete a contiguous
sewer system network within Pump Station #10 service area. Service laterals and
other private assets are excluded from this survey.
2. Barge's data collection will include a level and format of data that allows for
incorporation into (1) GIS software, (2) modeling software, (3) future sewer
maintenance planning, and (4) future hydraulic capacity analyses. Collection of
the attributes to allow for these future benefits only adds a small amount of effort
when already visiting a sewer structure for inventory purposes. Barge proposes
to collect/develop the following attributes for the manholes and structures.
a. Unique facility identifier
b. Photograph of location, photograph of interior, photograph inside connecting
pipes
c. Survey -grade horizontal coordinates (x, y) and elevation data (z) (rim
elevation for structures and invert elevation of pipes)
d. Sewer structure type
e. Dimensions for connecting pipes
f. Flow direction for connecting pipes
g.
Condition assessment — include a condition grade of structures (assessed
from ground level) while collecting the field data that can be used to prioritize
future maintenance planning activities. The proposed format will follow a
simplified NASSCO based format:
i. Grade 0: The asset is in excellent condition and has no documented
defects. It is similar to that of new construction with no installation
defects. This asset is at or near the beginning of its design life.
April 4, 2023
Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page 4 of 11
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, FL
April 4, 2023
ii. Grade 1: The asset is in good condition with only minor installation
defects or defects which are minor in nature as a result of its service
life so far. This asset is expected to have 20 or more years of
remaining service life.
iii. Grade 2: The asset is in moderate condition with several minor defects.
These minor defects, although not currently affecting its intended use,
will likely impact the overall length of the asset's service life. This asset
is expected to have 10-20 years of remaining service life.
iv. Grade 3: The asset is in fair condition and has one or more moderate
defects, but such defect(s) do not appear to be ones that would be
considered being of imminent risk of failure. This asset is less than 10
years from the end of its useful or design life.
v. Grade 4: Although the asset is partially or fully serving its intended
purpose, the asset is in poor condition and has significant defects
which are of imminent risk of failure. Failure may occur at any time
resulting in this asset being upgraded to a Grade 5. This asset is at
the end of its useful or design life.
vi. Grade 5: The asset has already failed and is no longer serving its
intended purpose. This asset has already surpassed its useful or
design life.
h. Crews will be formed with one Barge employee and one Client employee. The
Client employee will have the use of a City of Crestview truck. Barge will
provide the survey equipment (including pole camera). The crews will be
equipped with mobile devices capable of storing referenced attributes based
on the schema developed in Task 1. Spatially enabled photographs will be
taken with the device to automatically tie-in with the data form. Data collection
tasks are anticipated to include:
i. Collect field data using GPS equipment.
ii. Conduct systematic spot-checks and compare surveyed data to
existing GIS data.
iii. Format the collected information for incorporation into the Client's GIS
database.
iv. Transfer to the Client for continued use.
v. Produce overview maps indicating extent of inventory.
April 4, 2023
Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page 5 of 11
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, FL
April 4, 2023
i. Barge will provide and install, through its subconsultants, three flow monitoring
devices at pre -selected pump stations for temporary flow monitoring. The flow
monitoring is anticipated to be for a three-month period, pending weather that
will provide usable data.
j. Barge will perform draw -down tests for the pump stations included in the pilot
model.
Meetings:
The following meetings will be conducted as part of this task:
• Kickoff -Meeting (includes Data Collection Review and Model Development)
• Up to two Microsoft Team Meetings, as needed, during the data collection task
Deliverables:
The following deliverables will be provided as part of this task:
• Final deliverable of a single geodatabase containing the up-to-date data of the
pilot area of the sewer system. This information will be in a usable format for
future system analyses. This will contain the information listed in a. through
g..
Assumptions:
The following assumptions are applicable to the above scope of services:
• The Pump Station #10 basin is assumed to contain a maximum of 100
manholes.
• Barge will require access to manholes from 7am — 7pm during weekdays.
• Notices will be sent out by the Client to property owners that have manholes
located on their property.
• The sewer system to be inventoried has right-of-way access and no entry to
private property is required.
• Private manholes or manholes belonging to other utility companies will not be
surveyed.
• Barge personnel will not be entering manholes or confined spaces to collect
assessment data; pipe sizes, materials, and other attributes will be determined
based on a visual inspection from the ground surface, outside of the manhole.
April 4, 2023
Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page 6 of 11
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, FL
April 4, 2023
• This survey includes collection of assets that are on the mainline gravity sewer
system; clean outs and lateral pipes will not be located unless they are visible
inside of the manhole structure.
• Client will provide access to lift stations and assist in operating the pumps for
performing drawdown tests (up to three tests).
• Client will provide available SCADA data for lift stations and any available flow
monitors.
• This scope includes three months of flow monitoring at three locations.
Additional monitoring locations or duration will be additional services.
• Inaccessible structures will be noted in the geodatabase for informational
purposes for later access and collection. A list will be developed for a monthly
coordination meeting with the Client to give the Client the opportunity to clear
the required access, after which the feature will be revisited at the end of the
basin survey.
• The basic condition assessment is assumed to be completed visually from
ground level during the field data collection with the use of a pole camera, but
without CCTV.
Task 3 — Pilot Model
A pilot hydraulic sewer model will be assembled for an area of the collection system,
encompassing Pump Station #10.
For this task, Barge will provide the following services:
• Lift Station Data:
o Perform drawdown tests on the pump stations (up to 8) to be included in the
model with assistance from the Client.
• Flow Monitoring Data:
o Delineate monitoring areas and linear footage serving each area.
o Develop a plan for temporary flow monitoring at up to three monitoring sites.
o Implement temporary flow monitoring program.
o Collect confirmation data by the flow monitoring vendor one week after
installation.
o Collect 5-minute (or shorter interval) flow data by the flow monitoring vendor
on their web service.
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Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page 7 of 11
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, FL
April 4, 2023
o Service the monitors and rainfall gauges for up to three months by the flow
monitoring vendor.
o Identify dry -weather periods.
o Develop diurnal flow patterns for flow monitoring locations.
o Identify rainfall events for further analysis. Optimally, the rainfall event will be
isolated (with at least 72 hours preceding dry conditions), large enough to
show a system response and widespread so that all flow monitors and rain
gauges experience a response.
• The wastewater system hydraulic model for the pilot area will be developed using pre -
selected software in consultation with Barge. The data collected in the previous task
will be used to develop the model. The model development process and assumptions
will be discussed with the Client in a workshop. Any information gaps or issues with
model development will be discussed with the Client.
o Manhole invert and rim elevations will be based on survey data collected
during the project and input into GIS. This GIS infrastructure data will be
imported into the model.
o Manning's roughness for sewers will be based on pipe material (where
available) and adjusted as needed during the model calibration.
o C-factors for force mains will be based on pipe material and age and adjusted
as needed during the model calibration.
o Force main alignment will be imported from GIS data.
o Locations of high points as well as rising and falling sections will be obtained
from record drawings.
o Manufacturer pump curves supplied by the Client will be used to define pumps
in the model. Drawdown testing, where available, will be used to validate the
pump curves.
o As -built drawings will be used to input area and depth for wet wells.
• The hydraulic model will be developed and calibrated using flow data collected. The
calibration will be performed for dry -weather conditions and wet -weather conditions.
Industry guidelines will be used to develop calibration criteria.
Dry -Weather Flow Calibration
The dry -weather calibration will use flow data from a multi -day dry -weather period
preceded by 72 hours without rainfall.
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Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page 8 of 11
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, FL
April 4, 2023
o Analyze data to develop system diurnal flows.
o Develop weekday and weekend diurnal curves.
o Calibrate based on weekday and weekend average dry weather flow data.
o Match peak and average flow within industry guidelines.
Wet -Weather Flow Calibration
The wet -weather calibration will use data from at least three rainfall events each
preceded by a dry -weather period.
o Use calibrated dry -weather model.
o Develop initial RTK parameters for each delineated area, where R represents
the fraction of rainfall entering the sewer system as RDII, T is the time to peak
RDII flow, and K is the ratio of recession time to time -to -peak (T).
o Simulate response to observed events and adjust RTK parameters.
o Achieve match on peak and volume within the respective industry guidelines
for any monitoring location in the pressure system.
o Achieve match on peak, volume, and depth within the respective industry
guidelines for any monitoring location in the gravity system.
• The calibrated wastewater system hydraulic model will be used to evaluate the
existing system in the pilot area.
Meetings:
The following meetings will be conducted as part of this task:
• System Evaluation Workshop
• Up to three additional Microsoft Team Meetings, as needed, during system evaluation
and model development
• Model Development/Calibration Workshop
Deliverables:
The following deliverables will be provided as part of this task:
• Flow Monitoring Database
• Electronic Modeling Files
Assumptions:
The following assumptions are applicable to the above scope of services:
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Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page of
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, FL
April 4, 2023
• The Client will provide as built or record drawings for all force mains to be included in
the model.
• Barge will provide, install, and maintain three hybrid lift station flow monitors with level
sensors for constant speed monitors for the temporary study.
• Where data are unavailable or not attainable in a timely manner, the infrastructure will
be included in the model as inactive elements. These elements can be activated
when data is available to input into the model.
Task 4 — Sewer Basin Infrastructure Plan Development
Barge will review the parcel development densities using GIS tools to identify areas within
each sewer basin that have likely potential for future development. Development densities
will be used to develop flow projections. Flow projections for each sewer basin will be
documented within each sewer basin plan with a future development overview figure and flow
projection summary table for the 2040 plan period.
Barge will incorporate the flow projections distributed by parcels into the pilot basin sewer
model and the capacity assessment tool, using GIS spatial analysis tools and manual review.
Rainfall -derived inflow and infiltration (RDII) parameters will be assigned based on available
data from pump station recorded data or flow monitors. Barge will evaluate the basins under
future flow conditions to identify components of the existing infrastructure that fail defined
level of service criteria. Portions of the system that fail level of service criteria within the sewer
collection and transmission system are the basis for developing sewer improvements.
Infrastructure requiring sewer improvements will be documented within the sewer basin
planning document. The pilot hydraulic model including network(s), queries, selection sets,
and simulation results reflecting the impact of projected development on existing
infrastructure will be provided to the Client in the form of a transportable database.
Barge will develop recommendations for sewer improvements for portions within the sewer
system pilot area failing level of service criteria as previously identified or in areas requiring
new sewer. Potential sewer improvements will include upsizing of existing gravity mains,
extension of new gravity mains, pump station improvements, pump station decommissioning,
new pump stations, and temporary storage. The proposed sewer improvements will be
evaluated using the hydraulic model in the pilot area. Other areas will be evaluated based on
the existing pump station capacity for the anticipated flows. Planning -level budgets will be
developed using Client -provided unit costs for sewer improvements.
The areas of potential development, projected flows, and identified capacity issues will be
organized in a sewer infrastructure summary document for the pilot sewer basin.
Meetings:
The following meetings will be conducted as part of this task:
April 4, 2023
Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page 10 of 11
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 1
City of Crestview, FL
April 4, 2023
• Up to two Microsoft Team Meetings, as needed, during the model
development task
Deliverables:
• Database containing future flow sub -catchments
• Sewer Basin Planning Document (for the pilot sewer basin), including:
■ Flow projection summary figure and table
• Sewer improvements for the pilot area
Assumptions:
The following assumptions are applicable to the above scope of services:
• One round of draft development, Client review, and finalization is assumed for
the development of sewer improvements and the sewer basin planning
document.
• Detailed opinions of probable construction costs are assumed not to be part
of this scope.
III. Project Schedule
The preliminary project schedule for the described activities is shown in the table below.
Approximate durations are shown in calendar days after Notice to Proceed, from the previous
sequential task. All dates are based on timely receipt of field and Client -supplied data and
may be adjusted after data is received.
Tasks
Duration
(Calendar Days)
Sewer System Hydraulic Modeling, Phase 1 300 days total
Task 1 — Sewer GIS Review 30
Task 2 — Sewer Data Collection and Review 90
Task 3 — Pilot Model 90
Task 4 — Sewer Basin Infrastructure Plan Development 90
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