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City of Nashua, Public Works Division

Board of Public Works Meeting Date: August 22, 2019

Stephen Dockran, P.E., City Engineer
Engineering Department

Consent Decree
2019 Updated Long Term Control Plan

To approve the engineering consultant contract to Hazen of Manchester, NH tc
update the CSO ieng term control plan in an amount not to exceed $487,760.
Funding for this contract will be through Department: 169 Wastewater; Fund:
Wastewater; Activity: Consent Decree Operational.

Hazen Scope of Work and Fee

The City completed multiple projects from 1998 through 2015 to reduce the
frequency and volume of Combined Sewer Overflows (CSOs) discharging io the
Merrimack and Nashua Rivers so water quality can be improved as required by
the 1972 Clean Water Act. The CSO program was based first on a 1997 Long-
Term CSO Control Plan and then a 2003 Long-Term Water Quality and
Infrastructure Control Plan submitted to EPA and NHDES and various other
studies to investigate practicable and cost-effective measures to control CSOs.
All mandated CSO control projects have been implemented on schedule.

After review of completed CSO program, the EPA has concluded that further
CSO reduction is necessary. They have requested that the long-term control plan
be updated and projects identified to reduce or eliminate CSO’s under a “Phase 2”
~oO program. In addition, currently the City is also is subject to the 2017 New
Hamoshire Small MS4 General Permit that allows stormwater drain pipes to
discharge to local waterways. The EPA allows municipalities like Nashua with
multiple permits to use an integrated planning approach to prioritize and schedule
wastewater and stormwater projects based on the financial capability. This study
will develop recommend projects to comply with the EPA’s CSO Policy
requirement for LTCP development, and development of an Integrated Plan
consistent with EPA guidance and CWA requirements, meeting the goal of
improved water quality that is affordable and practical.

Hazen is currently working on the Capacity, Management, Operation and
Maintenance (CMOM) program tor both the sewer and storm drainage systems
Hazen has worked with the Engineering and Wastewater Departments on multiple

rojects related to the wastewater coilection system, the treatment plant and CSO
program, achieving satisfactory results. Hazen also manages the hydraulic model
INFO Works for the department. With their knowledge of the voth the
wastewater and stormwater systems, this study can be completed efficiently and
effectively. A significant part of the cost is the metering of the collection system.
This is required as part of this work due to the expansive changes in the

Customer may accept this Agreement by signing and returning the whole Agreement with (i) the Quotation
attached, (ii) a purchase order, or (iii) another document that matches the Quotation and references this
Agreement ("Ordering Document"). ADDITIONAL OR CONFLICTING TERMS IN CUSTOMER'S PURCHASE
ORDER OR OTHER DOCUMENT WILL NOT APPLY, AND THE TERMS OF THIS AGREEMENT WILL
GOVERN. This Agreement is effective as of the date of Esri's receipt of an Ordering Document, unless otherwise
agreed to by the parties ("Effective Date").

Term of Agreement: Three (3) years

This Agreement supersedes any previous agreements, proposals, presentations, understandings, and
arrangements between the parties relating to the licensing of the Products. Except as provided in Article 4—
Product Updates, no modifications can be made to this Agreement.

Accepted and Agreed:

(Customer)

By:

Authorized Signature

Printed Name:

Title:
Date:

CUSTOMER CONTACT INFORMATION
Contact: Telephone:
Address: Fax:
City, State, Postal Code: E-mail:
Country:

Quotation Number (if applicable):

Page 2 of 6 August 31, 2021

wastewater collection system since 1997 and rehabilitation work including
replacing and lining of sewers in portions of the City.

SUMMARY OF LABOR AND COSTS
CITY OF NASHUA, NH
CSO Long-Term Control Plan Update / integrated Plan

HAZEN AND SAWYER TEAM BUDGET

Notes:

1) Assumes 7 flow meters for 12 waaks (Flow Assessment quote, August 13, 2019)
2) Exclucies receiving water quality modeling/monitoring
3) Assumes 21 months total project duration

4) Asoumes 11 meatings total (Inclu

ig EPA quarterly updates)

: A . . : ry r TOTAL TOTAL LABOR & OTHER
Task Description resor Manager Engineer engineer (Peed PEER O” caLead MEI om. Hours “corans (NOIRECT INDIRECT. DIRECT. «FIXED FEE pot ans
Rates $77.23 $65.09 $33.03 $30.00 $87.94 $62.74 $84.63 $85.68 $60.10 OH 177.5% Profit 10.0%

4.0 Project Management, QA/QC, Meetings (11 meetings) 40 190 22 252 $76,183 844,924 $2,970 $4,492 $52,386
2.0 Existing Information/Data Review 8 40 40 2 2 82 $3,38 $9,386 sO $939 $10,324
3.6 Gharacterization of Existing Conditions (7 meters, 12 weeks} 4 30 so 50 214 $8,087 $22,449 341,510 $2,245 $66,204
4.0 Alternatives Analysis 16 40 400 80 24 320 24 904 $40,217 $111,642 sa $44,164 $122,807
6.0 Integrated Flan Framework 32 24 88 $4,193 $11,844 $0 $1,164 $42,805
6.0 Financlal Capability Analysis 4 4 32 160 200 $14,687 $26,084 $40,771 $0 $4,077 $44,848
7.6 Public Participation (City to lead) 9 $c $0 $0 80 $0 $o
8.0 PermitiRegulatory Requirement Assessment 8 16 16 32 72 $3,537 86,284 $9,818 $0 $982 810,806
9.€ Project Identification and Ranking & 40 40 8B $5,360 $9,519 $14,878 $0 $1,488 $16,366
10.0 Scenario Development, Optimization Model Runs, and Implementation Flan 8 80 40 428 $6,687 $14,865 546 $0 $1,855 $20,400
411.0 Draft and Final Report 40 120 400 120 80 16 32 40 32 880 $42,514 $75,504 $178,018 $1,000 $11,802 $130,820
587,760.

Hazen
SCOPE OF WORK.
CSO LONG TERM CONTROL PLAN UDPATE / INTEGRATED PLAN

GENERAL

The City of Nashua, NH developed and submitted a 1997 Long-Term CSO Control Plan and a
2003 Long-Term Water Quality and Infrastructure Control Plan to EPA and NHDES. Since
then, studies have been conducted to investigate more cost-effective measures to control CSOs
such as the Re-evaluation Study of CSO Control for CSO 005 and CSO 006 (March 2009).
These studies have resulted in modifications to some of the originally recommended elements
and associated implementation schedules that are in the current CSO Consent Decree Program.

The City has implemented all mandated CSO controls and has also developed and submitted a
CSO Post-Construction Monitoring Plan to EPA and NHDES. The EPA has since requested a
scope of work be developed for updating the Long-Term Control Plan in accordance with Clean
Water Act requirements.

The City is subject to the 2017 New Hampshire Small MS4 General Permit and has an ongoing
CMOM program for both the sewer and storm drainage systems. Through the integrated
planning approach as described in EPA’s "Integrated Municipal Stormwater and Wastewater
Planning Approach Framework,” a municipality, such as Nashua, can prioritize and schedule
wastewater and stormwater projects based on the municipality’s financial capability. This scope
of work is intended to comply with the EPA’s CSO Policy requirement for LTCP development,
and development of an Integrated Plan consistent with EPA guidance and CWA requirements.

SCOPE OF SERVICES

Task 1 — Project Management, QA/QC, Meetings

Project Management

Prepare a schedule including target submittal dates, anticipated review dates, and key meeting
dates. Prepare monthly progress reports presenting work activities completed during the reporting
period, budget status, schedule status, and identification of any out of scope items. Prepare
monthly invoices detailing project labor costs and other direct costs.

Quality Assurance / Quality Control (QA/QC)
QA/QC procedures shall be employed in order to maintain document quality. These procedures
will address the use of quality control reviews, engineering and calculations checking, and other

measures necessary to maintain a consistent, complete, high quality and compatible Integrated
Plan.

A QA/QC review will be conducted on every submittal prior to delivery to the City. These
reviews apply to all memoranda and reports generated for this project. Members of in-house
staff not associated with the project will be selected to perform these reviews.

August 2019 Page 1 of 7

CSO Long-Term Control Plan Update/Integrated Plan

Meetings

Consultant will meet with the City as needed throughout the project (6 per year, inclusive of
EPA quarterly meetings) to review project progress and obtain direction on technical work.
Consultant will develop and provide, for each meeting, agenda, schedule, presentation materials
(as needed) and minutes.

In addition to regular monthly meetings, Consultant will prepare for and attend quarterly
meetings with EPA/NHDES. Consultant will develop and provide, for each meeting, agenda,
schedule, presentation materials (as needed) and minutes.

All project deliverables will be provided to the City in both hard copy and electronic format (as
the City requires), and in both PDF and editable file format (e.g., word, CAD, etc.).

Deliverables:

e Two (2) copies of each monthly progress report.
e Two (2) copies of each monthly invoice.

e Meeting agendas and minutes.

Task 2 — Existing Information/Data Review

Consultant will collect and obtain prior CSO and stormwater planning documents as well as other
data from the City, including:
e 1997 Long-Term CSO Control Plan
2003 Long-Term Water Quality and Infrastructure Control Plan
2009 Re-evaluation Study of CSO Control for CSO 005 and 006
CSO Annual Reports submitted to EPA/NHDES
Minutes and related documents for pertinent agency/City meetings on CSO Consent
Decree program completion and acceptance
e The previous stormwater management plan and annual reports from 2004-2019
e Capital Improvement Plan processes, documents, reports, as available

Consultant will also obtain recent information from the City regarding operation of the collection
system that relates or impacts the combined sewer system performance. Review of the reports and
data collected will be performed to inform the background and existing conditions characterization
of the collection system, for the LTCP update.

Task 3 — Characterization of Existing Conditions

Existing receiving water and end-of-pipe water quality data will be collected (provided by City)
and reviewed. Consultant will request, based upon the review of this data, additional water quality
data collection (if required) for the purpose of characterizing existing conditions.

Temporary flow monitoring will be performed to characterize the response of the sewer system to
rainfall, and to re-calibrate the City’s InfoWorks collection system model. Existing conditions
model simulations will be performed to evaluate the current annual average (typical year)
performance of the system (e.g., CSO volumes, frequencies, percent capture).

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CSO Long-Term Control Plan Update/Integrated Plan

The existing collection system model will be updated using recent sewer data to be provided by
the City, including but not limited to as-built drawings, GIS data, and staff observations. This may
include refining tributary area delineations, updating invert or rim elevations, and/or updating
connectivity/configuration of the sewer system. The model’s parameters will be updated if needed
based on calibration/validation with temporary flow data collected in this task. Rainfall data will
be collected via permanent City gauges (3 total) and used in the calibration process.

Task 4 — Alternatives Analysis

Consultant will identify and evaluate a range of CSO reduction alternatives, including system
optimization, storage, treatment, sewer separation, and source controls. A range of CSO
alternatives will be evaluated between 0% and 100% CSO reductions (on an annual average basis)
using the sewer model. Knee of the curve evaluations (including costs) will be performed for the
alternatives.

Task 5 — Integrated Plan Framework

Consultant will perform Integrated Planning in accordance with the Water Infrastructure
Improvement Act which codified the 2012 EPA framework for integrated planning into the Clean
Water Act.

The overall purpose of the IP will be to assist Nashua in prioritizing and programming capital
improvements based on criteria most important to the municipality and the community. The IP
approach will result in a proposed capital schedule for a specified future planning horizon that
seeks to maximize benefits as early as possible based on the criteria, while also meeting all
requirements within the respective regulatory spectrum, including the Clean Water Act. The IP
will also result in integration and prioritization of capital projects for all applicable infrastructure
elements (wastewater and stormwater, and drinking water), thus eliminating a siloed approach to
capital project implementation.

Consultant will schedule workshops with City personnel to 1) facilitate the selection of preliminary
ranking criteria to be used for the triple bottom-line analysis, 2) develop guidelines and rules to be
used for inclusion and scoring of projects, 3) perform a preliminary importance ranking of selected
criteria, and 3) determine the preliminary list of projects and planning horizon timeframe from
which to base the integrated plan on.

Consultant will prepare a broad list of ranking criteria organized by environmental, social, and
economic categories as a first step. This list will serve as a reference only in the development of
the City’s criteria. An initial workshop will focus on environmental criteria and benefits to the
City, and then follow the same procedures for social and economic criteria. The result of the
workshop will be a working list of criteria to be used for the eventual scoring of capital projects.
This workshop will also include the preliminary discussion and development of project scoring
methods to be employed as the basis of the LTCP/IP. Consultant will describe the different
methods used and describe the preferred method (score-based quantification) in more detail.

An additional workshop will be conducted to determine the list of preliminary capital improvement
projects to be included in the integrated plan. Our understanding is that the list will include
wastewater, stormwater, and drinking water projects. The initial list will include those projects

August 2019 Page 3 of 7

CSO Long-Term Coniro] Plan Update/Integrated Plan

already identified by the City in its existing CIP, including, but not limited to, projects already in
design and construction. In addition to this base list of projects, the team will discuss and identify
other prospective projects that had previously not been considered because of funding constraints
or more pressing regulatory compliance schedules. In cases where discreet projects cannot be
identified, the team will identify recurring programs with funding allocations (such as annual
wastewater improvements) and those will be included as projects in the preliminary list. The intent
will be to identify a portfolio of projects that will benefit the City and satisfy regulatory
requirements.

Deliverables:

e Preliminary list of integrated plan ranking criteria, organized by environmental, social, and
economic categories

e Preliminary project scoring methodology and project inclusion guidelines

® Preliminary list of capital projects and/or recurring programs to be included in the planning
horizon

Task 6 — Financial Capability Analysis

Consultant will conduct an FCA for the purpose of providing the City with a “snapshot
picture” of its financial strength and the residential affordability relative to its current and
future CWA expenditure obligations. The USEPA issued guidelines for performing
FCAs in 1997 which established a two-step process to assess:

° Residential Ratepayer Affordability; and
° Municipal Financial Strength

Residential affordability is determined by the ratio of the cost per household of the CIP
compared to Median Household Income. EPA’s standard metric for measuring a “high
economic impact” is 2 percent of MHI. Municipal financial strength is based on a six
metrics that consider the municipality’s level of indebtedness, socioeconomic conditions,
and taxing capacity. Any additional guidelines specific to the state of New Hampshire
will be considered in these assessments. The results from the two assessments are then
combined to yield a numerical score that indicates the level of financial burden on the
municipality and its ratepayers attributable to current and planned future expenditures.

The FCA output is a high level and static depiction of the municipality’s financial
capacity to implement its CIP under its currently planned schedule. EPA has
acknowledged the deficiencies of the metrics established by the 1997 guidelines and
issued a revised set of guidelines in 2014. The 2014 guidelines allow permittees to
provide supplemental socioeconomic data that could better characterized the local
conditions of the permittee. Examples of socioeconomic data that could be provided
include but are not limited to:

Quintile Household income Data

Poverty Levels

Fixed income population

Demographic Trends

Housing characteristics (renter versus home ownership)
Cost of Living

August 2019 Page 4 of 7

CSO Long-Term Control Plan Update/Integrated Plan

e Required expenditures for other regulatory programs including SDWA
expenditures

These supplementary data should provide a much more detailed and accurate perspective
of the financial impacts of EPA’s CWA mandates on the City’s municipality and its
ratepayers.

To perform the FCA, Consultant will collect socioeconomic data from the American
Community Survey (ACS) and other open source data from the Census Bureau and other
official state and Federal sources as needed. Consultant will also obtain detailed
financial data from the City including its latest CAFR, its bond ratings, and budget
information on the operation of its wastewater utility. Sources of debt by type and annual
payment obligations will also be obtained. These data will then be used to generate the
metrics that comprise the FCA scorecard. Consultant will use the supplemental data to
adjust the scorecard as applicable and provide a detailed evaluation on how the
supplemental data demonstrates the true economic impact of the CWA mandates.

Deliverables:
e Draft and Final FCA

Task 7 — Public Participation

City will conduct public workshops to inform the community of the LTCP Update/Integrated Plan
and encourage residents to participate in the process. Workshops will be conducted at key
milestones during the development of the LTCP/IP. While Consultant will not lead this task,
Consultant will be available for questions/support for the City in their preparation/execution of
these meetings.

Task 8 ~ Permit/Regulatory Requirement Assessment

MS4 Permit needs, and any new NPDES requirements, will be addressed and evaluated such that
the implications of this work will be incorporated into the LTCP/IP.

Task 9 — Project Identification and Ranking

Consultant will coordinate a workshop with the City to rank the final criteria by applying
importance weights. This will be done using an iterative process with City staff. Staff will
individually rank the benefit categories and criteria in order of importance to them based on their
own judgement, then staff will perform a pair-wise comparison, which consists of comparing two
criteria at a time to each other for all pairing scenarios. This will be repeated and reviewed until
there is agreement on the relative importance of all criteria to each other.

The final project list to be included in the LTCP/IP analysis will be developed. This list will
incorporate any projects identified as a result of the above investigation and study-phase tasks, as
well as any other projects defined since development of the initial list. Other project constraints
will be determined, such as “mission critical” projects that must be done and are therefore not to
be subject to optimization scheduling. Project cost estimates and required life cycle durations will

August 2019 Page 5 of 7

CSO Long-Term Control Plan Update/Integrated Plan

be included in the final list. In the event that estimated costs and durations are not defined,
Consultant will provide conceptual estimates and timelines.

With the final scoring methodology complete and all! projects identified, designated City staff will
score each project to determine its raw score. Consultant will provide the City with options for
how to conduct scoring, i.e. whether a City group leader should score themselves, or have a number
of staff conduct scoring and then calculate a representative score. Once raw scores are complete,
the final ranked (incorporating the criteria rankings) scores for each projects can be calculated.
This will represent the final list of ranked projects to be used for development of the
implementation schedule.

Deliverables:

e Final criteria rankings, including an Excel chart, the pair-wise comparison results, and
other associated documentation

e Final project list, including estimated costs and project life cycle duration, to be used for
the LTCP/IP scoring, optimization scheduling, and implementation

e Raw score and weighted scores for all projects

Task 10 — Scenario Development, Optimization Model Runs, and Implementation Plan

Consultant will work with the City to develop different infrastructure implementation scenarios to
be used for the schedule optimization model and implementation plan. Possible scenarios include
1) the status quo — City’s current situation and current planned wastewater CIP based on current
regulatory compliance deadlines, 2) an unconstrained scenario with all projects (including water
treatment and water distribution projects) with no financial constraints including budgetary and
affordability constraints. The Consultant will work with the City to incorporate expenditure
scenarios into the City’s Rate Model to estimate impacts on sewer rates over the planning period.
Affordability of future rates will allow the City to demonstrate to EPA which compliance
schedules are the most affordable to the City while still meeting its regulatory obligations.
Additional scenarios relevant to the City may be discussed and evaluated.

Depending on the scenarios developed, capped annual capital outlays (i.e., funding limits) will be
incorporated into the schedule. For each scenario, Consultant will develop the schedule, a list of
projects and estimated costs to be completed within the planning period, and any projects which
are deferred to years beyond the planning period. Charts showing annual cost by project type over
time and spending limits, if applicable, will be produced as well. In addition, the benefits
distribution charts will be produced for each scenario.

Deliverables:

e Technical memorandum defining the scenarios to be used

e Optimization schedules, lists of projects to be implemented within the planning horizon,
list of deferred projects, annual costs over time charts, and benefits distribution charts for
each scenario

August 2019 Page 6 of 7