HomeMy WebLinkAboutAttachment 1 - 2019 Rexburg Sewer Master PlanJ-U-B ENGINEERS, Inc.
City of Rexburg – 2019 Sewer Master Plan Page - 1 Attachment 1 – Scope of Services
ATTACHMENT 1 – Scope of Services
City of Rexburg
Sewer Collection System Master Plan
J-U-B # 80-18-506
PROJECT UNDERSTANDING
The City of Rexburg (City) has requested J-U-B Engineers, Inc. (J-U-B) to provide engineering services
to assist in updating the City’s Sewer Collection System Master Plan. The previous Master Plan was
completed in 2007. The City has experienced growth since then and has addressed some of the Capital
Improvement Plan (CIP) projects identified in the previous plan.
This project will update the existing system model and add a committed service model scenario.
Modeling assumptions, land use designations and unit flows will be updated. The master plan model will
be updated to match the current planning boundary. In addition, modifications to the Master Plan will be
made in areas where development has taken place. The updated Master Plan will provide the
conceptual layout of the sewer trunk lines 10-inches and larger. J-U-B will work with City staff throughout
all phases of the Sewer Master Plan Update, such as estimating future growth patterns, estimates of
build-out densities and total build-out populations. A new CIP will be developed to provide a prioritization
for capital improvement projects based on the results of the existing system analysis and the growth
projections.
Upon City review and approval of the updated Sewer Collection System Master Plan Report, J-U-B will
submit it to Idaho DEQ for review and approval. In general, the outline of the report will be as follows:
2019 Sewer Collection System Master Plan (Table of Contents)
Executive Summary
Chapter 1 – Introduction and Background
Chapter 2 – Existing System Summary
Chapter 3 – Existing Model
Chapter 4 – Committed Model
Chapter 5 – Growth Projections and Planning Information
Chapter 6 – Master Plan Model
Chapter 7 – Capital Improvement Plan
Chapter 8 – Summary
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SECTION 1 – ITEMS TO BE PROVIDED BY THE CITY TO J-U-B
A. Provide on-going review of J-U-B’s work and timely considerations of policy issues within a
time acceptable to the City and J-U-B.
B. Work with J-U-B to determine the best method of integrating water use data with parcel data
for injecting flows into the model.
C. Provide an updated GIS layer of all existing sewers in the City system. Provide data including
rim, invert, and pipe diameter for all sewer trunks, as available. Provide current pump station
information.
D. Provide record drawings of existing collection system components that may be required for
modeling.
E. Provide the following wastewater flow data:
Daily WWTP flows for the past year
Hourly and daily flows from the WWTP for the flow monitoring period
Hourly and daily flows for lift stations
Hourly and daily flows for any significant industrial users
F. Access to the sewer system, lift stations and wastewater treatment plant as needed to install,
check and remove flow monitors.
G. Temporary traffic control during installation and removal of flow monitors.
H. Other items that may be necessary that are not in the scope of services and are not assigned
to J-U-B as additional work.
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SECTION 2 – SERVICES TO BE PERFORMED BY J-U-B
J-U-B’s scope of services is specifically limited to the following:
PHASE 1 – PROJECT DEFINITION & FLOW MONITORING
The project definition tasks are designed to evaluate potential software packages and modeling
approaches and determine the best approach for the City. Flow monitoring will be conducted to
assist with existing hydraulic model calibration (see Subtask 216). Flow monitoring equipment will
be provided via subcontractor to J-U-B.
Task 100 – Phase 1 Project Management
101 – Phase 1 Project Management
a) Monitor team progress and resources, action item lists, task deadlines, and items needed
from the City. Provide documentation and regular updates on a monthly basis or as
needed. Prepare monthly written project updates, progress reports and invoicing.
Task 110 – Flow Monitoring
111 – Flow Monitoring
a) Identify 5 gravity flow monitoring locations and 3 lift station monitoring locations in
coordination with the City.
b) Install gravity flow and lift station monitors. It is anticipated the monitors will be installed for
17 days and then removed.
c) Provide a brief summary memorandum of the data collected during flow monitoring,
including graphs of flow data. To be added as an appendix to overall master plan report.
Additional Services – Phase 1
J-U-B will perform the following additional services only as directed by the City:
o Additional Monitoring Sites: Add additional gravity monitoring sites beyond the planned 5
sites. Install monitors at different locations in order to identify smaller basins with large
infiltration contributions, specific land use types or area with capacity concerns.
o Extended Monitoring Duration: Extend the monitoring duration beyond the planned 17
day gravity monitoring period on a per day basis.
o Combined Forcemain Investigation: Site visit to each lift station on common forcemain to
observe pump cycles. Install lift station monitors on 3 of the lift stations that use the
common forcemain for 3 days. Collect data and move monitors to the other 3 lift stations
that use common forcemain for 3 days. Collect data and remove lift station monitors.
Provide a brief summary memorandum of the data collected during gravity and lift station
monitoring.
Phase 1 Deliverables
Draft Flow Monitoring Summary Memorandum (PDF).
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PHASE 2 – EXISTING SEWER MODEL UPDATE AND ANALYSIS
The Phase 2 scope of work is based on the water meter/parcel method for flow generation.
Task 200 – Phase 2 Project Management
201 – Project Management
a) Monitor team progress and resources, action item lists, task deadlines, and items needed
from the City. Provide documentation, and regular updates on a monthly basis or as
needed. Prepare monthly written project updates, progress reports and invoicing.
Task 210 – Update Existing Model
211 – Data Collection and Modeling Assumptions Update
a) Obtain and review the following data:
GIS information from the City for all sewer lines, including rim and invert elevations
where available.
Lift Stations pump curves, SCADA pumping data, operation set points and record
drawings.
Permit information for all permitted significant industrial users, including current permit
limits and future permit limits.
WWTP flow data. Identify 2-3 significant recent rainfall events that led to noticeable
increases of flow at the wastewater treatment plant (WWTP). Also, obtain WWTP flow
data for flow monitoring period.
b) Review and confirm modeling assumptions with City. Draft a technical memorandum
summarizing the modeling assumptions to be used in the model. Submit one electronic copy
(PDF) of the draft Modeling Assumptions TM to the City for review.
c) Address comments received through internal QA/QC and City review of the draft Modeling
Assumptions TM. Incorporate the revised Modeling Assumptions TM into the overall
Master Plan document as an appendix.
212 – Collection System Layer
a) Provide the City with the previous HYDRA model information for rims, inverts and pipe
sizes in GIS format. The City will update the collection system layer with the best available
data for trunk lines ≥ 10-inches in diameter and critical 8-inch lines identified by the City.
The remaining pipes smaller than 10-inch in diameter will be considered non-critical, but
those in the existing GIS layer will be included in the model to facilitate flow routing.
b) Survey rims and inverts of manholes identified in consultation with the City to fill critical
information gaps. Eight hours of survey time is included. Additional survey will be
considered an additional service. The City will resolve all other information gaps with
record drawings or identify the gap as non-critical.
c) Non-critical information gaps in rim and invert data will be approximated in the model using
straight grading or interpolation.
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213 – Sanitary Flow Generation Layer
a) Coordinate with the City to obtain water meter data for each customer in the City. The City
will attach average winter water usage and land use designations to each water meter in
the water meter shapefile.
b) Summarize unit flows for each land use type for use in future model scenarios.
214 – Infiltration and Inflow
a) Estimate the infiltration caused by seasonal irrigation for each major sewer basin in the
system (gallons per acre per day, GPAD). Utilize flow monitoring data collected in Subtask
121 and recent WWTP data. Values will be calibrated in Subtask 216.
b) Evaluate flow monitoring data and WWTP data for the 3 storm events identified in Subtask
211. Determine inflow volumes that reach the sewer and develop draft inflow parameters
for each basin to apply in the model.
215 – Model Development
a) Load the updated layers and parameters into the model, including the collection system
layer, sanitary flows, infiltration flows and inflow parameters.
b) Assign injection points for each flow.
c) Develop the following modeling scenarios:
Scenario Infiltration Inflow Sanitary Flows
Dry Calibration Peak Irrigation No Storm Event Existing Flows
Existing Calibrated Peak Infiltration Design Storm Existing Flows
d) Allocate flows, run the model and resolve any errors, inconsistencies or issues identified for
each scenario.
216 – Model Calibration
a) Calibrate the model for the dry scenario using flow monitoring data collected in Subtask
121. Use initial infiltration values determined in Subtask 214 as a starting point for
calibration. This model calibration will identify the peak infiltration in each basin and
confirm diurnal curves used in the model.
217 – Existing System Capacity Analysis
a) Determine the appropriate design storm for use in wet weather scenario analyses based on
the wet weather calibration and discussions with the City.
b) Analyze the model results for the ‘Existing’ scenario.
c) Identify collection system bottlenecks or trunks showing stress with respect to
recommended design parameters in the existing collection system for existing flows.
d) Summarize flows into existing lift stations and the remaining capacity.
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218 – Documentation
a) Prepare a draft of chapters 1-3 of the Collection System Master Plan document (1-
Introduction and Background; 2-Existing System Summary; 3-Existing Model). The
Modeling Assumptions TM will be included as an appendix. Submit one electronic copy
(PDF) to the City for review.
b) Perform an internal review of the Existing Model and draft chapters by senior level staff. All
QA/QC comments will be reviewed and addressed before deliverables are finalized.
c) City Review Workshop #1. Present results to date. Discuss City comments on draft
chapters 1-3.
d) Address comments received through internal QA/QC and City review of Chapters 1-3 of the
Master Plan document.
Task 220 – Near Term CIP Projects
221 – Near Term Capital Improvement Plan
a) Develop future flows for basins with near-term CIP projects (Mill Hollow LS, Yellowstone
Highway Trunk). Identify future flows from other municipalities (Teton, Sugar City).
b) Develop the near-term CIP model scenario.
c) Allocate flows, run the model and resolve any errors, inconsistencies or issues identified for
each scenario.
d) Analyze the model results for the near-term CIP scenario.
e) Develop improvement projects for the following near-term CIP projects: Mill Hollow LS,
Yellowstone Highway Trunk.
f) Prepare planning level opinion of probable capital costs for each near-term project.
Additional Services – Phase 2
J-U-B will perform the following additional services only as directed by the City:
o Additional Survey: Additional survey of rims and inverts beyond the eight hours included
in Subtask 212.
o Wet Weather Model Calibration: Calibrate the model for the wet scenario using flow data
collected in Subtask 211 and flow monitoring data. Use initial inflow parameters
determined in Subtask 214 as a starting point for calibration.
Phase 2 Deliverables
Draft Modeling Assumptions Technical Memorandum (PDF).
Draft Collection System Master Plan Report: Chapters 1-3 (PDF).
Near-term CIP Project Summaries
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PHASE 3 – SEWER MASTER PLAN UPDATE AND ANALYSIS
Task 300 – Phase 3 Project Management
301 – Project Management
a) Monitor team progress and resources, action item lists, task deadlines, and items needed
from the City. Provide documentation, and regular updates on a monthly basis or as
needed. Prepare monthly written project updates, progress reports and invoicing.
Task 310 – Demographics
311 – Demographics
a) Obtain and review planning documents including the current comprehensive plan, specific
area plans and other current City planning documents.
b) Summarize existing population estimates.
c) Determine recent development density trends by analyzing ten (10) recent developments.
Compare current densities to Comprehensive Plan densities and establish future land use
densities for use in the Master Plan.
d) Develop study area boundary and build-out population projections for the study area.
e) Meet with the City to review densities, land use assumptions, study area boundary and
population projections.
f) Revise and update densities, land use and population projections based on discussions
with the City.
Task 320 – Update Master Plan Models
321 – Update Master Plan Collection System Layer
a) Update conceptual horizontal and vertical alignments, as well as pipe size, for future trunk
lines ≥10-inches in diameter required to serve the study area. Modify the Master Plan
System Layer to account for expansion of the existing system and recent development.
b) Examine current Master Plan routes for constructability and improved routing efficiencies.
Incorporate any current City capital improvement projects.
c) Field survey flow lines of drains/creeks where master plan sewer crossings are proposed to
confirm viability of the vertical alignment.
322 – Update Master Plan Service Area Layer
a) Update Master Plan service areas and injection points that define how an area is provided
sewer service. Modify the Master Plan Service Area Layer to account for expansion of the
existing system and recent development.
323 – Update Master Plan Flow Generation Layer
a) Update the future land use layer using the current comprehensive plan and discussion with
the City. Unit flows and densities developed in earlier tasks will be used to estimate flows.
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Identify areas for redevelopment at higher densities/unit flows through discussions with the
City.
b) Add infiltration and inflow allocations for the future growth areas using rates similar to low
values identified in the existing system during calibration.
324 – Model Development
a) Load the updated layers and parameters into the model and develop the master plan
modeling scenario.
b) Allocate flows, run the model and resolve any errors, inconsistencies or issues identified.
325 – Master Plan Capacity Analysis
a) Analyze the Master Plan scenario results.
b) Identify collection system bottlenecks or trunks showing stress with respect to
recommended design parameters in the existing collection system for master plan flows.
c) Summarize master plan flows into existing lift stations and the remaining capacity.
d) Compare model results to the previous Master Plan.
Phase 3 Deliverables
None
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PHASE 4 – CAPITAL IMPROVEMENT PLAN & FINAL REPORT
Task 400 – Phase 4 Project Management
401 – Project Management
a) Monitor team progress and resources, action item lists, task deadlines, and items needed
from the City. Provide documentation, and regular updates on a monthly basis or as
needed. Prepare monthly written project updates, progress reports and invoicing.
Task 410 – Capital Improvement Plan
411 – Capital Improvement Plan
a) Develop potential improvement projects to address the bottlenecks and capacity problems
identified in the Existing and Master Plan model analyses.
b) Develop example rehabilitation and/or replacement programming and prioritization.
c) City Review Workshop #2. Present results to date. Review the potential capital
improvements with the City and select preferred improvements. Discuss yearly goals for
replacement and rehabilitation projects and example programming.
d) Prepare planning level opinion of probable capital costs for each of the preferred capital
improvements and preliminary unit costs for replacement and rehabilitation projects.
e) Develop and run a model scenario that contains all of the preferred CIP projects to confirm
the capacity problems have been resolved.
f) Develop a Capital Improvement Plan (CIP) that summarizes needed capital improvement
projects, replacement and rehabilitation projects and associated costs. Develop an
implementation schedule for the CIP. Evaluate the current budget versus needs outlined in
the CIP and the City’s replacement and rehabilitation goals. Include projects currently
under construction and/or planned in the CIP from Subtask 411.
Task 420 – Model Training
421 – Model Training
a) Provide on-site model training for City Staff. Training will include instruction on the general
use of the modeling software and specific use of the Committed Model scenario. The
budget assumes two 2 hours training sessions.
Task 430 – Documentation
431 – Final Documentation
a) Prepare a draft of the complete Collection System Master Plan document. Submit one
electronic copy (PDF) to the City for review.
b) Perform an internal review of the Collection System Master Plan document by senior level
staff. All QA/QC comments will be reviewed and addressed before deliverables are
finalized.
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c) Address comments received through internal QA/QC and City review of the Master Plan
document. Revise as necessary.
d) Submit one electronic copy (PDF) of the complete draft Master Plan Report to DEQ for
review and approval. Submittal will not include a review of existing environmental
conditions or treatment plant information but assumes that this information has been
previously and adequately covered in the City’s treatment plant facilities plan and will not
be required for DEQ approval of the collection system Master Plan.
e) Address comments received from DEQ. Review DEQ comments and proposed resolutions
with City. Document DEQ comments, resolutions and approval in an appendix.
f) Finalize and seal the Master Plan Report and submit five (5) hard copies and PDF file to
the City.
Additional Services – Phase 4
J-U-B will perform the following additional services only as directed by the City:
o On-call Sewer Modeling Assistance: Provide sewer modeling assistance as requested
by the City. This could include additional model training, help running the committed
model or evaluating proposed modifications to the master plan.
o Committed Flow Model Scenario: Develop a committed model scenario to track new
committed flows. Committed flows will include everything the City has committed to
serve (inside city limits or promised service by the City). Develop a committed flow
tracking spreadsheet to estimate committed flows at the City’s WWTP. Identify collection
system bottlenecks or trunks showing stress with respect to recommended design
parameters in the existing collection system for committed flows.
Phase 4 Deliverables
Draft Master Plan Report for City Review (PDF).
Draft Master Plan Report for DEQ Review (PDF).
Final Master Plan Report (5 hard copies and PDF).
GIS shape files for master plan service areas and pipes (including results).
Hydraulic Model Files (modeling software and license cost not included)
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SECTION 3 – TIME OF PERFORMANCE
The following schedule is based on a Notice to Proceed (NTP) from the CITY for Phase 1 on
9/13/2018, which results in final deliverables being completed by August 16, 2019. Extended DEQ
review times could require extending the completion date. An NTP issued on a different date would
change the schedule accordingly.
Phase Task
Number Task Due By
1 100 Phase 1 Project Management Throughout Phase 1
110 Flow Monitoring Oct 19, 2018
2
200 Phase 2 Project Management Throughout Phase 2
210 Update Existing Model Feb 15, 2019
220 Near Term CIP Projects Mar 1, 2019
3
300 Phase 3 Project Management Throughout Phase 3
310 Demographics Mar 15, 2019
320 Update Master Plan Model May 10, 2019
4
400 Phase 4 Project Management Throughout Phase 3
410 Capital Improvement Plan June 28, 2019
420 Model Training After completion of Task 410
430 Documentation August 16, 2019
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SECTION 4 – COMPENSATION
The CITY will pay J-U-B for its services and reimbursable expenses on a time and materials (T&M)
not to exceed basis depending on the task as shown in the detailed breakdown of the budget
estimate provided below. Additional services are not included. If additional services are requested,
J-U-B will provide the City with an estimated budget to complete the requested tasks.
Phase Task
Number Task Fee Type Amount
1
100 Phase 1 Project Management T&M $1,200
110 Flow Monitoring T&M $19,500
2
200 Phase 2 Project Management T&M $2,600
210 Update Existing Model T&M $35,100
220 Near Term CIP Projects T&M $7,400
3
300 Phase 3 Project Management T&M $1,300
310 Demographics T&M $3,700
320 Update Master Plan Model T&M $25,100
4
400 Phase 4 Project Management T&M $2,100
410 Capital Improvement Plan T&M $21,400
420 Model Training T&M $2,000
430 Documentation T&M $12,600
TOTAL: $134,000
For time and materials services performed on the project, the City shall pay J-U-B an amount equal
to the cumulative hours charged to the Project by each class of J-U-B’s personnel times their hourly
rate listed in the attached rate table (Exhibit 1-A), plus any J-U-B subconsultant charges (if
applicable) times a multiplier of 1.1, plus reimbursable expenses.
Exhibit(s):
1-A: Rate Table