HomeMy Public PortalAboutTO 2024-2 Sewer System Hydraulic _ Barge DesignTask Order No. 2024-2
Sewer System Hydraulic Modeling, Phase 2
City of Crestview, Florida
March 27, 2024
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 2 (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
$427,000.00. The budget status will be summarized monthly in our progress report and invoice
submittal.
City of Crestview, Florida
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City of Crestview, Florida
Task Order 2024-2
Sewer System Hydraulic Modeling, Phase 2
Barge Design Solutions, Inc.
By:
Printed Kevin W. Kennoy, P.E.
Name:
Title: Vice President
Address: 600 Grand Boulevard, Suite 302
Miramar Beach, FL 32550
Date Signed: March 27, 2024
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 2
City of Crestview, FL
March 27, 2024
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 2 of the
Sewer System Hydraulic Modeling Project, in accordance with Task Order No. 2024-2. 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 2 includes providing sewer basin infrastructure planning support to map
lift stations and their contributing collection system, for a part of the system.
This project is a continuation of Phase 1 and will provide the Client with an updated GIS
system with the known features, 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.
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 Updates
Task 2 — Sewer Data Collection and Review
Task 3 — Preliminary Model Assembly
Task 4 — Preliminary Sewer Basin Infrastructure Plan Development
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Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page 1 of 9
BARGE
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 2
City of Crestview, FL
March 27, 2024
Figure 1, Crestview Sewer System
March 27, 2024
Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL
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A RGi
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 2
City of Crestview, FL
March 27, 2024
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 Updates
This task will update the newly obtained condition assessment data in the Client's GIS
system per the recommended standards in Phase 1. The updates will include the GIS
features defined in Phase 1 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).
• Update the GIS databases in a similar structure periodically as more data is
obtained.
Meetings:
The following meetings will be conducted as part of this task:
• GIS review meeting prior to the final deliverable of data.
Deliverables:
The following deliverables will be provided as part of this task:
• Presentation and incorporation of data.
Task 2 — Sewer Data Collection and Review
After reviewing infrastructure and operational data as obtained in Phase 1, Barge will
assess data gaps for the areas under Phase 2. Additional data required will be flagged for
collection. This Task Order is based on an assessment of the service area of the North and
South Basin, 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
described service area as required for the assembly of the model, including installed
metered data for up to 12 meters throughout the entire system. 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 the North Basin service area. Service laterals and
other private assets are excluded from this survey.
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Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 2
City of Crestview, FL
March 27, 2024
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.
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.
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Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 2
City of Crestview, FL
March 27, 2024
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 GIS schema developed in Phase 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.
i. Barge will provide and install, through its subconsultants, up to 12 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. The flow monitoring will occur
throughout the City's entire collection system simultaneously.
j. Barge will perform draw -down tests for the pump stations included in the
described area.
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
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BARGE
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 2
City of Crestview, FL
March 27, 2024
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 North Basin is assumed to have approximately 660 manholes. This
scope includes a maximum of 1,100 manholes encompassing the North
Basin and part of the South Basin.
• 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.
• 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 up to 12 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
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Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 2
City of Crestview, FL
March 27, 2024
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 — Preliminary Model Assembly
Assembly of a model for the surveyed area will be diverted to Phase 3. Modelling efforts for
this phase will be limited to map updates and structuring the data for inclusion in the model.
For this task, Barge will provide the following services:
• Flow Monitoring Data:
o Delineate monitoring areas and linear footage serving each area.
o Develop a plan for temporary flow monitoring at up to 12 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.
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.
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IMARGc
Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 2
City of Crestview, FL
March 27, 2024
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.
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
Deliverables:
The following deliverables will be provided as part of this task:
• Flow Monitoring Database
Assumptions:
The following assumptions are applicable to the above scope of services:
• 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 up to 12 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.
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Exhibit A, Scope of Work
Sewer System Hydraulic Modeling, Phase 2
City of Crestview, FL
March 27, 2024
Task 4 — Preliminary Sewer Basin Infrastructure Plan Development
Barge will connect the parcel development densities using GIS tools to the newly obtained
sewer data to identify areas within each sewer basin that have likely potential for future
development.
Meetings:
The following meetings will be conducted as part of this task:
• Up to two Microsoft Team Meetings, as needed, during the Plan
development task
Deliverables:
• Updated Database containing future flow sub -catchments
Assumptions:
The following assumptions are applicable to the above scope of services:
• 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 2 240 days total
Task 1 — Sewer GIS Review 240
Task 2 — Sewer Data Collection and Review 240
Task 3 — Preliminary Model Assembly 240
Task 4 — Preliminary Sewer Basin Infrastructure Plan 240
Development
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