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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 Printed Name: Title: 4/4 ye Address: / S� �1�/ G/; ken eKt--1-V;ctd,FL r2x1 Date Signed: /y /2e/ Page 1 of 1 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 March 27, 2024 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 Page 2 of 9 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. March 27, 2024 Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page of 8ARGi 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. March 27, 2024 Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page of 2ARGi 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 March 27, 2024 Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page 5 of 9 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 March 27, 2024 Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page of 8ARG -7, 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. March 27, 2024 Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page of 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. March 27, 2024 Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page of 9ARGa 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 March 27, 2024 Sewer System Hydraulic Modeling, Phase 1, City of Crestview, FL Page 9 of 9