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City of Nashua, NH
Capacity, Management, Operation and Maintenance (CMOM) and Stormwater Collection System
Investigation and Evaluation Program - Phase II
Scope of Work for Engineering Services

A. Project Administration, Meetings, and Quality Assurance/Quality Control (Tasks A1-A3)

TASK Al Project Management

This subtask includes time required for general project coordination and management, maintenance of project
records and documentation, control of budget and schedule, including preparation and submission of work
schedules, invoices and monthly progress reports. Monthly progress reports shall outline budget, project and
schedule status through all phases of the project.

Deliverables: | One copy of each monthly invoice and progress report.

TASK A2 Quality Assurance / Quality Control (QA/QC)

The on-going QA/QC plan shall be updated to address new milestones, and personnel assigned to the project.
These QA/QC procedures shall be employed in order to maintain deliverable quality during all phases of the
project. These procedures shall address the use of quality control reviews, engineering and calculations
checking, and other measures necessary to maintain a consistent, complete, high quality and compatible
product. A QA/QC review shall be conducted on submittals prior to delivery to the City. Members of in-house
staff not associated with delivery of the project shall be selected to perform these reviews. It is assumed that
QA/QC reviews conducted under this Task will include the following deliverables: Collection System O&M Plan
Update, CMOM Quarterly Updates, Phase II Rehabilitation Recommendation Technical Memorandum (TM),
Force Main Condition Assessment TM, Miscellaneous Below Grade Wastewater Structures TM, Flow Monitoring
Evaluation TM, Headwall Inspection TM.

TASK A3 Meetings
Consultant shall prepare for and attend progress meetings when requested by City staff to review project status,

and to address the technical aspects of the work and results of the field investigations, analyses, and other
efforts associated with the project. The Project Manager and the appropriate technical staff shall attend these
meetings, as needed for the specific agenda. Appropriate NHDES staff will be invited to attend the kick-off, mid-
project and wrap up meetings. Consultant shall issue an agenda prior to each meeting and shall also prepare the
minutes detailing the topics and discussions of each meeting. It is assumed that meetings conducted under this
Task will include the following: Twelve (12) bi-monthly meetings, one hundred and 4 (104) weekly meetings, one
(1) kickoff meeting.

Deliverables: Attendance and preparation of agendas for each progress meeting. Preparation and
distribution of one copy of the recorded meeting minutes to all participants after each meeting.

B. CMOM (Tasks B1-B8)

Consultant shall perform engineering services for the continuation of the CMOM Program that complies with
the requirements of the EPA and NHDES criteria and implements the capacity, management, operation
management and maintenance of the City’s sewer collection system. The scope includes the following tasks:

Task B1 Collection System Operation and Maintenance (O&M) Plan Update
Task B2 CMOM Quarterly Updates
Task B3 Sanitary Sewer CCTV and Manhole Inspections and Evaluation
Task B4 Sanitary Sewer GIS Edits and Updates
Task B5 Force Main Condition Assessment

2

AUGUST 2021

City of Nashua, NH
Capacity, Management, Operation and Maintenance (CMOM) and Stormwater Collection System
Investigation and Evaluation Program - Phase II
Scope of Work for Engineering Services

Task B6 Inspection of Miscellaneous Below Grade Wastewater Structures
Task B7 PACP Training
Task B8 Sewer System Flow Monitoring

TASK B1 — Collection System Operation and Maintenance (O&M) Plan Update
The Consultant shall assist the City with annual updates to the Collection System O&M Plan. This document,
developed in 2020, is a “living” document to be used by City employees and should be updated annually or
whenever significant changes occur. This task shall also include the creation and/or update of up to ten (10)
standard operating procedures (SOPs). Components of the O&M Plan to be updated annually include:
e Collection System Management
o Organizational Structure
Training
Internal Communication
Customer Service
Management Information Systems
Unauthorized Discharge Notification Systems
o Legal Authority;
e Collection System Operation
o Budgeting
Monitoring
Hydrogen Sulfide Monitoring and Control
Safety
Emergency Preparedness and Response
Modeling
Mapping
New Construction
o Pump Stations;
e Equipment and Collection System Maintenance
o Maintenance Budgeting
o Planned and Unplanned Maintenance
o Sewer Cleaning
© Parts and Equipment Inventory
o Easements — Location and Maintenance;
e Sewer System Capacity Evaluation — Testing and Inspection
o Flow Monitoring
o Sewer System Testing
o Sewer System Inspection; and
e Sewer System Rehabilitation

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Deliverables: | Electronic (PDF and editable word) versions of Draft and Final O&M Plan Update
(including SOPs), and five (5) hard copies of Final O&M Plan Update for the City and distribution to EPA
and NHDES. Hard copies shall be distributed in a 3-ring binder for ease of document replacement for
annual updates.

AUGUST 2021

City of Nashua, NH
Capacity, Management, Operation and Maintenance (CMOM) and Stormwater Collection System
Investigation and Evaluation Program - Phase II
Scope of Work for Engineering Services

TASK B2 — CMOM Quarterly Updates

The Consultant shall assist the City in preparation of the CMOM Quarterly Updates. These updates are quarterly
submittals to the NHDES and EPA. The CMOM Quarterly Updates shall document actions pertaining to the
operation and maintenance of the City’s Collection System during each quarter. The Consultant shall prepare
eight (8) quarterly updates, due on January 15, April 15, July 15, and October 15 as the schedule requires. By
the first day of the month in which a quarterly report is due, the Consultant shall prepare and submit a bulleted
list of CMOM Program milestones completed during each quarter to the City. The City shall submit the quarterly
update to USEPA and NHDES.

Deliverables: — Electronic versions of Quarterly Updates for City distribution to the EPA and NHDES.
Deadlines for Submittals are January 15, April 15, July 15, and October 15 of each calendar year of this
contract.

Task B3 — Sanitary Sewer CCTV_and Manhole Inspections and Evaluation

The Consultant, through its subcontractor, shall conduct the assessment of pipes and manholes identified
through the City’s Continuous Sewer Assessment Plan (CSAP) developed in previous years of the CMOM
Program. It is assumed for the purposes of this scope that up to 100,000 linear feet of pipe shall be reviewed in
each of the two years. This includes 20,000 linear feet of pipe per year inspected by City forces and the
remaining 80,000 If to be inspected by the Consultant’s subcontractor. Consultant shall use Microsoft’s Power BI
and ESRI’s GIS to track progress. The City shall have access to review progress with these tools. Any additional
effort required beyond the amount budgeted shall require additional budget to be negotiated between the City
and the Consultant.

B3.1 CCTV, and Manhole Inspections

The subcontractor shall perform CCTV inspection and cleaning of approximately 80,000 If of the sewer
collection system in the first year and 80,000 If of sewer in the second year for a total of 160,000 If. It is
assumed approximately 600 manholes shall be inspected for each year for a total of 1,200 manholes.
CCTV inspection shall be completed in accordance with the PACP Standards V7.0. The Contractor shall
use personnel for CCTV inspection who are trained and certified (in current standing) in the use of
NASSCO’s PACP framework.

The Subcontractor shall perform manhole inspections of all sewer manholes accessed during the CCTV
inspections. Manhole inspections shall include obtaining a global positioning system (GPS) of each
manhole and shall be performed according to the NASSCO MACP V7.0 Level 1 inspection criteria, with
several additional criteria as selected by Hazen.

B3.2 Assist with Sewer, and Manhole Inspections

Consultant shall provide as-needed coordination with the CCTV subcontractor including the
development of maps for the crews and the QA/QC of the CCTV coding. Consultant shall prepare and
provide maps (digital or hardcopy) for the sewer pipes and manholes to be inspected in the first year
and second year to the subcontractor for inspections. Consultant shall attend periodic meetings with
the City to review areas inspected and areas to be inspected and hold weekly calls between all
stakeholders during work.

AUGUST 2021

City of Nashua, NH
Capacity, Management, Operation and Maintenance (CMOM) and Stormwater Collection System
Investigation and Evaluation Program - Phase II
Scope of Work for Engineering Services

B3.3. Identify Sewers and Manholes for Rehabilitation/Replacement

Consultant shall conduct a detailed evaluation of the inspection data for the sewer and manhole
inspections. Consultant shall then utilize its in-house tools to develop rehabilitation or replacement
recommendations. The videos shall be reviewed once received by the Consultant. Recommendations
shall include a set of maps (digital or hardcopy) outlining the rehabilitation recommendations including
rehabilitation method or replacement. In addition, the Consultant shall provide a master document
summarizing the CCTV data and Consultant’s recommendations.

Deliverables: | CCTVand manhole Inspection Reports from Subcontractor. Interim recommendation
spreadsheets shall be submitted to the City upon request, all data is available in real time via GIS and
through ProjectWise. The spreadsheets shall show progress to date of reviews. Three (3) hard copies
and one (1) pdf file shall be submitted per month from receipt of first Subcontractor transmittal.
Consultant shall deliver final updated prioritized spreadsheet and map.

Rehabilitation recommendation technical memoranda shall be prepared and delivered to the City at the
conclusion of each year. The Consultant shall prepare one (1) pdf file and five (5) hardcopies of each
years’ report.

TASK B4 — Sanitary Sewer GIS Edits and Updates

Consultant shall provide support for improving and updating the City’s GIS database. The updates (including the
addition of sewer service connections to properties and catch basin laterals in the areas where sewer CCTV is
performed) shall be based on the sewer system inspections and City records which may yield variances from
existing data in the GIS database. The Consultant shall work with the City’s GIS coordinator to coordinate
updates. The work shall include periodic submittals to the City’s GIS coordinator outlining recommended
modifications to the GIS. The Consultant shall document the GIS database changes in Excel tables. Any
additional effort required beyond the amount budgeted shall require additional budget to be negotiated
between the City and the Consultant.

Deliverables: Updates to the City’s GIS.

TASK B5 — Force Main Condition Assessment
A force main condition assessment shall be performed to evaluate the force main materials and bedding
conditions. The consultant shall identify conditions of the pipe and general recommendations.

B5.1 ‘Inspection and Testing
The Consultant shall engage a Subcontractor to perform a Condition Assessment including non-
destructive testing of a force main to be determined. For the purpose of budgeting the force main is
assumed to be 10-in dia., ductile iron, approximately 800 feet long with an accessible air release valve
(ARV). A Condition Assessment shall be conducted to evaluate the pipeline materials and bedding
conditions. Such assessment shall include performing non-destructive test of pipe including ultrasonic
thickness (UT) wall thickness measurements and pit depth gauge measurements on the exterior of the
pipe. Access to the force main shall be through confined space entry into the ARV chamber and up to
two (2) test pits. Visual examination to assess the condition of the pipe and existing coatings or
encasement shall be made. One (1) soil sample shall be obtained at each test pit for corrosivity testing

AUGUST 2021

City of Nashua, NH

Capacity, Management, Operation and Maintenance (CMOM) and Stormwater Collection System

B5.2

Investigation and Evaluation Program - Phase II
Scope of Work for Engineering Services

and analyses (2 soil sample for laboratory corrosivity analysis total). Pipe to soil potential stray current
identification measurements shall be performed.

Force Main Condition Assessment Technical Memorandum

Based on the abovementioned inspection and testing the Consultant shall prepare and submit a Force
Main Condition Assessment Technical Memorandum (TM). The TM shall contain the Reports from
Subcontractor and detail inspection field findings, soils data on corrosivity scoring, and include
annotated digital photographs and a table that presents all UT data by location on the force main. The
TM shall contain conclusions as to the conditions of the pipe and general recommendations.

Electronic versions (PDF and Word format) of the Draft TM shall be submitted to the City for review and
comment. Following the City’s review of the Draft TM, Consultant shall incorporate the City’s comments,
and submit a Final TM.

Deliverables: | Inspection Reports from Subcontractor. Electronic (PDF and editable word) versions of
Draft and Final TM, and five (5) hard copies of Final TM.

TASK B6 — Inspection of Miscellaneous Below Grade Wastewater Structures

Inspection of miscellaneous below grade wastewater structures shall be performed to document their existing
conditions. The Consultant shall identify existing conditions of the structures and provide general
recommendations.

B6.1

B6.2

Inspections

The Consultant shall engage the services of a subcontractor to conduct Inspections of miscellaneous
below grade wastewater structures to document their existing conditions. These structures include
eight (8) Siphon Inlet Chambers, eight (8) Siphon Outlet Chambers and the lower level of one (1) Pump
Station (CSO 5 Levee Pump Station). Confined space entry procedures and preparatory cleaning of
structures shall be implemented as needed to conduct inspections. Tasks shall include video inspection
and photographs of the below structures including walls, floor, ceiling, channels, wet wells, and pipe
connections. Measurements shall be taken of all pipe penetrations off the floor. Photographs of all
gates, valves and other mechanical components shall be taken.

Technical Memorandum

Based on the abovementioned inspection and testing the Consultant shall prepare and submit a
Technical Memorandum (TM). The TM shall inspection findings and include annotated digital
photographs and general recommendations on the condition of the structures.

Electronic versions (PDF and Word format) of the Draft TM shall be submitted to the City for review and
comment. Following the City’s review of the Draft TM, Consultant shall incorporate the City’s comments,

and submit a Final TM.

Deliverables: Inspection Reports and videos from Subcontractor. Electronic (PDF and editable word)
versions of Draft and Final TM, and five (5) hard copies of Final TM.

AUGUST 2021

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City of Nashua, NH
Capacity, Management, Operation and Maintenance (CMOM) and Stormwater Collection System
Investigation and Evaluation Program - Phase II
Scope of Work for Engineering Services

TASK B7 — PACP Training

Consultant shall provide Pipeline Assessment Certification Program (PACP) training. PACP is the North American
Standard for pipeline defect identification and assessment, providing standardization and consistency to the
methods in which pipeline conditions are identified, evaluated and managed. The goal is to have pipeline system
owners create a comprehensive database to properly identify, plan, prioritize, manage and renovate their
pipelines based on condition evaluation. The Consultant shall conduct up to two (2) 3-day training sessions for
NASSCO’s Pipeline Assessment, Manhole Assessment and Lateral Assessment and Certification Program. Classes
shall be held virtually and the maximum class size is 10 people per class. The required text, Pipeline Assessment
& Certification Manual, shall be provided for each participant.

Deliverables: Conduct two (2) 3-day virtual training sessions for NASSCO’s Pipeline Assessment,
Manhole Assessment and Lateral Assessment and Certification Program (including manuals).

Task B8 — Sewer System Flow Monitoring

Flow monitoring shall be performed to identify bottlenecks within the Sanitary Sewer Collection System under
various storm events and dry weather. The Consultant shall provide recommendations for upgrades to the
collection systems based on the results of this Task.

B8.1 Review Existing Information
Consultant shall review existing information provided by the City, including:
e Record drawings and sewer mapping
e Geographic Information Systems (GIS) data
e Closed-Circuit Television (CCTV) data
e Records from staff regarding field observations (e.g., SSO history, etc.)
e Pump station flow and operational data

B8.2 Collect Flow/Rainfall Monitoring Data
Consultant shall conduct a temporary flow and rainfall monitoring program to establish a recent,
continuous and simultaneous data set of velocities, depths and flows in the sewer system. This
monitoring program shall utilize area-velocity metering equipment that allows measurement of flows
and levels both below and above the pipe crown, to capture the range of potential sewer system
responses to rainfall, including surcharged conditions. Data shall be reported in five-minute intervals.
The data collected shall be used in the calibration/validation of the hydrologic/hydraulic model.

The flow and rainfall monitoring program shall be conducted for a period of eight (8) weeks.

A total of six (6) temporary flow meters are included in this task. Rainfall data shall be obtained from the
rain gauge at the wastewater treatment facility. Consultant shall select the monitoring locations,
administer the subcontract to the flow monitoring subcontractor, assist the subcontractor in selection of
alternate metering sites as needed due to adverse field conditions, and conduct QA/QC for the data
collected.

AUGUST 2021

City of Nashua, NH

Capacity, Management, Operation and Maintenance (CMOM) and Stormwater Collection System

B8.3

B8.4

B8.5

Investigation and Evaluation Program - Phase II
Scope of Work for Engineering Services

Model Calibration/Verification

Consultant shall utilize the flow and rainfall monitoring data collected to perform dry and wet weather
calibration and verification of the hydraulic model. The monitoring data collected shall be used to
initially calibrate/verify the model. Representative storm events of varying intensities and depths shall
be selected from the rainfall data set to be used for calibration and verification. Three (3) storms shall
be used for calibration and one (1) for verification of the model.

The model shall be calibrated by adjusting hydrologic and hydraulic parameters until reasonable
agreement is reached between observed and predicted flows, volumes and depths. Model calibration
accuracy and quality shall be judged by industry-standard guidelines.

Model Simulations

Consultant shall use the calibrated and verified model to simulate design storm events, and evaluate the
sewer system response to wet weather, including the 1-year, 2-year, and 5-year storm events. Baseline
(current conditions) scenario shall be evaluated. The ability of the sewer system to convey baseline
flows during both dry and wet weather shall be evaluated. Locations of predicted surcharging and
hydraulic deficiencies shall be identified. Tables and figures depicting the performance of the collection
system for each storm event shall be developed. Tables shall show the length of sewers surcharged by
size ranges, and figures shall illustrate sewers that are partially and fully surcharged, including type of
surcharge (i.e., backwater-induced or capacity-related).

Flow Monitoring Evaluation Technical Memorandum

Consultant shall develop and submit a Flow Monitoring Evaluation Technical Memorandum (TM),
incorporating the results of Tasks B8.1 through B8.4. The TM also include a table of contents, sketches,
technical narratives, methodologies, results, and all pertinent information used to develop and calibrate
the model, and conduct model simulations.

Electronic versions (PDF and Word format) of the Draft TM shall be submitted to the City for review and
comment. Following the City’s review of the Draft TM, Consultant shall incorporate the City’s comments,
and submit a Final TM.

Deliverables: Flow meter data and updated model. Flectronic (PDF and editable word) versions of
Draft and Final TM, and five (5) hard copies of Final TM.

C. Stormwater Collection System Investigation and Evaluation (Tasks C1-C4)
Consultant shall perform engineering services for the continuation of the City’s Stormwater Collection System
Investigations. The scope includes the following tasks:

Task C1
Task C2
Task C3
Task C4

Stormwater CCTV and Manhole Inspections
Stormwater GIS Edits and Updates
Headwall Inspections

Green Infrastructure Inventory

AUGUST 2021

City of Nashua, NH
Capacity, Management, Operation and Maintenance (CMOM) and Stormwater Collection System
Investigation and Evaluation Program - Phase II
Scope of Work for Engineering Services

Task C1 — Stormwater CCTV and Manhole Inspections and Evaluation
The Consultant shall utilize Closed-Circuit Television (CCTV) Inspection to determine the structural and
operational defects, and potential illicit connections or dumping within the drain system.

CCTV shall be utilized to inspect drain lines and culverts to record and document pertinent information on pipe
length, pipe diameter and pipe material, pipe condition and potential illicit connections. Similar to the sewer
line assessment, CCTV shall be performed by a subcontractor with requirements they use NASSCO PACP for pipe
assessments and MACP for manhole assessments. The Consultant shall review that information and provide the
City a report documenting the characteristics of the drainage system. CCTV shall be completed in the first and
second years. The Consultant shall work with the City to identify 35,000 If of pipe to be inspected in the first
year and 35,000 If in the second year based on prioritization conducted previously. The Consultant shall
coordinate the drainage system inspections to align with the prioritization of the sewer in areas where sewer
pipes are in the same roadway or alignment as the drainage pipes. Any additional effort required beyond the
amount budgeted shall require additional budget to be negotiated between the City and the Consultant.

C1.1. CCTV and Manhole Inspections

The same subcontractor shall perform the sewer and drain pipe inspections. The subcontractor shall
perform CCTV inspection and cleaning of approximately 35,000 If of the drainage system in the first year
and 35,000 If of drain pipe in the second year for a total of 70,000 If. It is assumed approximately 100
drain manholes shall be inspected for each year for a total of 200 manholes. CCTV inspection shall be
completed in accordance with PACP Standards V7.0. The subcontractor shall use personnel for CCTV
inspection who are trained and certified (current standing) in the use of NASSCO’s PACP framework.

The Subcontractor shall perform manhole inspections of all drain manholes accessed during the CCTV
inspections. Manhole inspections shall include obtaining a global positioning system (GPS) location of
each manhole and shall be performed according to the NASSCO MACP V7.0 Level 1 inspection criteria
with the addition of other criteria selected by Hazen.

C1.2 ~~ Assist with CCTV and Manhole Inspections

Consultant shall provide as-needed coordination with the CCTV contractor including the development of
maps for the crews and the QA/QC of the CCTV coding. Consultant shall prepare and provide maps for
the drain pipes and manholes to be inspected in the first and second years to the subcontractor for
inspections. Consultant shall attend monthly meetings with the City to review areas inspected in the
previous month and areas to be inspected in the next month. This meeting shall coincide with the CCTV
work for the sewer lines.

C1.3. Identify Sewers and Manholes for Rehabilitation/Replacement

Consultant shall conduct a detailed evaluation of the inspection data for the sewer and manhole
inspections. The videos shall be reviewed once received by the Consultant. Consultant shall then
develop rehabilitation or replacement recommendations. Recommendations shall include a set of maps
outlining the rehabilitation recommendations including rehabilitation method or replacement

Deliverables: | CCTV Inspection Reports and videos from Subcontractor. Interim recommendation
spreadsheets shall be submitted to the City upon request, all data is available in real time via GIS and
through ProjectWise. The spreadsheets shall show progress to date of reviews. Three (3) hard copies

9
AUGUST 2021

City of Nashua, NH
Capacity, Management, Operation and Maintenance (CMOM) and Stormwater Collection System
Investigation and Evaluation Program - Phase II
Scope of Work for Engineering Services

and one (1) pdf file shall be submitted per month from receipt of first Subcontractor transmittal.
Consultant shall deliver final prioritized spreadsheet and map.

TASK C2 — Stormwater GIS Edits and Updates

Consultant shall provide support for improving and updating the City’s GIS database. The updates shall be based
on the storm drainage system inspections which may yield variances from existing data in the GIS database. This
work shall include catch basin laterals as identified through the pipe inspections. The Consultant shall work with
the City’s GIS coordinator to coordinate updates. The work shall include periodic submittals to the City’s GIS
coordinator outlining recommended modifications to the GIS. The Consultant shall document the GIS database
changes in Excel tables. Any additional effort required beyond the amount budgeted shall require additional
budget to be negotiated between the City and the Consultant.

Deliverables: | Updates to the City’s GIS

TASK C3 — Headwall Inspections
Inspection of headwalls shall be performed to document their existing conditions. The consultant shall identify
existing conditions of the structures and provide general recommendations.

C3.1 ‘Inspections
The Consultant shall engage the services of a subcontractor to conduct inspections of headwalls to
document their existing conditions. The Subcontractor shall perform inspections of all headwalls
accessed during the CCTV inspections of culverts and others as directed. The subcontractor shall
perform inspection of approximately 50 headwalls in the first year and 50 headwalls in the second year
for a total of approximately 100 headwalls. Inspections shall include photographs of the structures
including headwalls, wingwalls and aprons, documentation of construction material, signs of
deterioration, evidence of scour, evidence of movement, obstruction, and proximity to roadway.

C3.2. Technical Memorandum
Based on the abovementioned inspection the Consultant shall prepare and submit a Technical
Memorandum (TM). The TM shall include inspection findings and include annotated digital photographs
and general recommendations. Recommendations may include the need for testing and structural
inspection.

Electronic versions (PDF and Word format) of the Draft TM shall be submitted to the City for review and
comment. Following the City’s review of the Draft TM, Consultant shall incorporate the City’s comments,
and submit a Final TM.

Deliverables: Inspection Reports from Subcontractor. Electronic (PDF and editable word) versions of
Draft and Final TM, and five (5) hard copies of Final TM.

10
AUGUST 2021