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February 2021 EXHIBIT B

City of Nashua, NH
Siphon Rehabilitation
Scope of Work for Engineering Design Services

Background

During the Phase 1 of the City’s CMOM program the City’s eight inverted siphons were cleaned and inspected.
The siphons were constructed between the 1960’s and the early 1980’s. Six siphons are triple-barrel and two are
double-barrel comprised of various materials and diameters ranging from 6 inches to 60 inches in diameter.
Below is an inventory of the siphons inspected:

Table 1 Inventory of Siphons Inspected

weak Name ee Size (in) Material — Length (ft)
18 RCP
CSO 6 Trestle Bridge Nashua River 48 RCP 183
60 RCP
10 Cl
Canal St Parking Lot Nashua River 36 RCP 252
36 RCP
21 RCP
Main St Nashua River 30 RCP 180
60 RCP
10 Cl
Fairmount St Nashua River 18 RCP 280
30 RCP
21 RCP
Exit 6 Nashua River 16 Cl 247
8 Cl
a ~ a.
Palisade Dr Salmon River 280
24 Cl
La "noo
7 New Searles Salmon River 70
24 DI
6 DI
Kathy Dr Salmon River 8 DI 186
10 DI

Hazen and Sawyer (Consultant) shall perform engineering services for the rehabilitation of seven of the City’s
eight siphons. The scope includes the following tasks:

Task A Project Administration, Meetings and Quality Assurance/Quality Control
Task B_ Design and Bidding Phase Service

City of Nashua, NH
Siphon Rehabilitation
Scope of Work for Engineering Design and Construction Phase Services

A. Project Administration, Meetings, and Quality Assurance/Quality Control

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 will outline budget, project and
schedule status through all phases of the project.

A2 Quality Assurance / Quality Control (QA/QC)

The on-going QA/QC plan will be updated to address new milestones, and personnel assigned to the project. The
Project Manager will be responsible for developing, tracking and implementing this plan. These QA/QC
procedures shall be employed in order to maintain deliverable quality during all phases of the project. 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 product. A QA/QC review
will be conducted on every submittal prior to delivery to the City. Members of in-house staff not associated with
the Project will be selected to perform these reviews.

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

A3 Meetings

Consultant will 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 field investigations, analyses, and other efforts
associated with the project. The Project Manager and the appropriate technical staff will attend these meetings,
as needed for the specific agenda. Consultant will issue an agenda prior to each meeting and will also prepare
the minutes detailing the topics and discussions of each 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. Design and Bidding Phase Services (Tasks B1-B2)
Hazen and Sawyer (Consultant) shall perform engineering services for the design and construction of siphon
rehabilitation. The scope includes the following tasks:

Task B1 Design Services for Siphon Rehabilitation
Task B2 Bidding Phase Services

TASK B1 — Design Services for Siphon Rehabilitation

Consultant shall prepare design plans for the rehabilitation of 14 barrels of 7 siphons. The following design
services will be performed under this Task:

FEBRUARY 2021

City of Nashua, NH
Siphon Rehabilitation
Scope of Work for Engineering Design and Construction Phase Services

Table 2 Summary of Recommended Siphon Rehabilitation

Name Size Material Rehab Siphon Comment
(in) Recommendation QSR

CSO 6 18 RCP CIPP 2813 CIPP for cracks, visible aggregate

Trestle

Bridge

Canal St 10 Cl CIPP 3121 Install full length CIPP due to erosion of cement

Parking liner.

Lot 36 RCP ISR 1100 Install ISR from 63-71 LF from DSMH to repair
crack and |/| stain. Work with contractor to
ensure that ISR can navigate bend.

Main St 21 RCP CIPP 5242 Hole and severe corrosion, leaving
reinforcement visible. Use a pre-liner to cover
hole and use water cure to avoid excessive
pressure on host pipe. Drill hole and inject grout
to fill void post-liner cure.

c) Fairmount 10 Cl CIPP 3J00 Install full length CIPP due to potential hole at
St 28 LF from $2154 and deteriorating cement
liner throughout.

18 RCP CIPP 2J00 Install full length CIPP for I/l, aggregate visible
throughout pipe, and possible cracking at 193
LF from USMH.

30 RCP CIPP 4231 Install full length CIPP due to I/l, cracks, and
surface damage throughout.

5 Exit 6 8 Cl CIPP 3100 Install full length CIPP due to many instances
of failing cement liner.

16 Cl CIPP 3100 Install full length CIPP due to deteriorating
cement liner throughout.

21 RCP CIPP 4132 Install full length CIPP due to surface damage,
visible rebar, and some aggregate visible
throughout.

7 New 10 Di CIPP 1A00 Cement lining mostly missing, DIP may be
Searles corroding/tuberculation evident. Some Joint
Rd Separation.'

24 DI CIPP 2A00 Cement lining mostly missing, DIP may be
corroding/tuberculation evident. Some Joint
Separation.'

Kathy Dr 8 Di CIPP 4131 Cement lining mostly missing, DIP may be
corroding/tuberculation evident. Some Joint

Separation.'

10 DI CIPP 3122 Corrosion and cement lining damage
throughout.'

B1.1 Develop Base Maps

Consultant will be responsible for preparing base maps to be used for the design. The base maps will be
prepared in accordance with the following: The base maps will consist of GIS topographic data, information
from record drawings, and field investigations for confirmation. Consultant to provide services for field
verifying the base map information. City will conduct topographic survey for areas of work as required. The
survey will consist of mapping all surface features and preparing existing contours at 1-foot intervals.

3
FEBRUARY 2021

City of Nashua, NH
Siphon Rehabilitation
Scope of Work for Engineering Design and Construction Phase Services

B1.2 Field Investigations

Consultant will collect utility (i.e., gas, water, sewer, fiber optic, electric, cable) record information and field
verify location of utility information as needed. Field verification of utility information will consist of site
walks to visually locate utilities within the right-of-way and visual inspection of internal manhole and catch
basin structures from the surface to verify size and location of pipes entering and leaving these structures.
Photographs and field measurements will be obtained as necessary to resolve potential design conflicts in
advance of construction.

Available record information of utilities will be shown on the design drawings. Photographs and
measurements taken to resolve potential design conflicts will also be shown on design drawings where
required.

B1.3 Development of Design Documents

Design plans, specifications, and opinion of probable construction cost will be submitted to the City for
review at the 90% and Final (100%) design milestones. The Contract drawings will be prepared using a
combination of AutoCAD 2018, existing record information along with ArcMap or ArcGIS Pro. Design plans
will be prepared at 40-scale (1”=40’ horizontal and 1”=4’ vertical) and 20-scale (1”=20’ horizontal and 1”=5’
vertical). It is assumed for the purposes of this scope that 32 drawings will be prepared. Consultant will
prepare design documents in conformance with the applicable rules, laws, regulations and specifications of
the City of Nashua, New Hampshire.

Deliverables: — Four (4) copies of the design deliverables (Opinion of Probable Construction Cost and
Contract Documents) will be submitted to the City for review at 90% and Final.

Task B2 — Bidding Phase Services
Consultant will assist the City in obtaining bids and awarding the construction contract in accordance with the

design plans and specifications. The Consultant shall:

B2.1 Provide written responses to questions and inquiries received from contractors, suppliers and
other parties. (It has been has assumed that one (1) set of Questions and Answers will be addressed.)

B2.2 Assist in the preparation of addenda to the contract documents. (It has been has assumed that
one (1) Addenda will be prepared.)

B2.3 Attend one pre-bid conferences for general bids. Assume one 8-hour day, including preparation
and travel time.

B2.4 Prepare and submit a tabulation of general bids received.

B2.5 Evaluate the bid forms for the contract to determine if the general bids were complete,
accurate, and balanced.

B2.6 Review and provide input on the determination if the bidders are financially and technically
qualified to perform the required work.

FEBRUARY 2021

City of Nashua, NH
Siphon Rehabilitation
Scope of Work for Engineering Design and Construction Phase Services

B2.7 Provide written recommendations and evaluations of the three lowest general bidders. Include
whether or not the bidders have the skill, ability and integrity to perform the work required for the Project
based on a determination of competent workmanship and financial soundness. Provide a written

recommendation to award the construction contract to the lowest responsible and eligible general bidder.

Deliverables: | One (1) copy of Responses to Bidders’ Questions, Addenda, Bid Tabulations, Meeting
Minutes and Recommendation to Award.

FEBRUARY 2021

SUMMARY OF LABOR AND COSTS - DRAFT 10/16/20
CITY OF NASHUA, NH
SIPHON REHABILITATION - DESIGN & BIDDING

HAZEN AND SAWYER TEAM BUDGET BY TASK

EXHIBITC

/ / _. _ TOTAL TOTALLABOR& = OTHER
Task Description aoe we Asseiate Associate or principal enneipal Engineer Technician ours eae INDIRECT INDIRECT DIRECT FIXED FEE boltans
9 9 9 COSTS DOLLARS COSTS
OH Rate: Profit:
Rates $ 88.00 $ 6800 $ 73.00 $ 53.00 $ 55.00 $ 43.00 $3900 § 21.00 179.0% 10.0%
A1_ Project Admin, Meetings, and QAQC 16 96 24 0 56 0 0 0 192 $12,768 $22,855 $35,023 $2,100 $3,562 $41,285
B1 Design Services for Sewer Rehabilitation Recommendations 8 46 20 0 470 0 348 0 892 $44,714 $80,038 $124,752 $2,000 $12,475 $139,227
B2 Bidding Phase Services 3 17 4 0 40 0 16 0 80 $4,536 $8,119 $12,855 $100 $1,266 © -$14,021
[Project Totals L 2 159 48 0 566 0 | 36 | 0 | 1164 | $62,018] __ $111,012] $173,030] $4,200] $17,303] $194,533

Notes:
1. Overhead Rate: 179.0%
2. Profit: 10%

SUMMARY OF LABOR AND COSTS - DRAFT
CITY OF NASHUA, NH
SIPHON REHABILITATION - DESIGN & BIDDING

HAZEN AND SAWYER TEAM BUDGET FOR TASK A1 - Project Admin, M and QAQC
. . oe _ TOTAL TOTAL LABOR & OTHER
Task Description aoe we Asseiate Associate or principal enneipal Engineer Technician ours eas. R INDIRECT INDIRECT DIRECT FIXED FEE DOLLARS
9 8 8 cosTs DOLLARS cosTs
Rates $88.00 $68.00 $73.00 $53.00 $55.00 $43.00 $39.00 $21.00 OH 179.0% Profit 10.0%
A1i.1 PM 0 54 0 0 0 0 0 0 54 $3,672 $6,573 $10,245 $0 $1,024 $11,269
A1.2 QAQC 8 16 24 0 16 0 0 0 64 $4,424 $7,919 $12,343 $1,600 $1,234 $15,177
A1.3 Meetings 8 26 0 0 40 0 0 0 74 $4,672 $8,363 $13,035 $500 $1,303 $14,838
$0 $0 $0 $0 $0 $0
[Task At Totals [16 6% «Y 24 0 [Ls | o | 0 [| 0 | 192 $12,768] $22,855] $35,623] $2,100] $3,562] $41,285
Assumptions Hours No. Units Units Total oDcs Comment
Al.1. PM
general project coordination and management 6 6 Months 36
maintenance of project records and documentation 1 6 Months 6
control of budget and schedule 2 6 Months 12
A1.2 QAQC
90% & Final Design Documents 12 2 Submittals 24 $ 1,600.00 Printing $400 Drafts, $600 90%, $600 Final
A1.3 Meetings

Weekly meetings

26 meetings

26 $ 500.00 Travel

SUMMARY OF LABOR AND COSTS - DRAFT
CITY OF NASHUA, NH
SIPHON REHABILITATION - DESIGN & BIDDING

HAZEN AND SAWYER TEAM BUDGET FOR TASK B1 - Design Services for Siphon Rehabilitation

. . oe _ TOTAL TOTAL LABOR & OTHER
Task Description aoe we Asseiate Associate or principal enneipal Engineer Technician ours eas. R INDIRECT INDIRECT DIRECT FIXED FEE DOLLARS
9 8 8 cosTs DOLLARS cosTs
Rates $88.00 $68.00 $73.00 $53.00 $55.00 $43.00 $39.00 $21.00 OH 179.0% Profit 10.0%
Bi.1 Develop Base Maps 0 4 0 0 16 0 40 0 60 $2,712 $4,854 $7,566 $250 $757 $8,573
B1.2 Field Investigations 0 2 0 0 16 0 16 0 34 $1,640 $2,936 $4,576 $250 $458 $5,283
B1.3 90% and Final Design 8 40 20 0 438 0 292 0 798 $40,362 $72,248 $112,610 $1,500 $11,261 $125,371
[Task B1 Totals | 46 I 20 0 [470 | 0 | 348 | 0 | 892 | $44,714] $80,038] $124,752] $2,000] $12,475] __ $139,227
Assumptions Hours No. Units Units Total oDcs Comment
B1.1 Develop Base Maps
GIS topographic data 2 7 Sites 14
information from record drawings 2 7 Sites 14
field investigations 4 7 Sites 28 $ 250.00 2 ppl2 hrs each site + travel
B1.2 Field Investigations
4 7 Sites 28 $ 250.00 2 ppl2 hrs each site + travel
B1.3 90% and Final Design See DwgList LOE

It is assumed that no enviromental permiting will be required.

$1,500.00 4 sets plans & specs (2 submittals & check prints)

Draft Drawing List and Bid Set LOE

City of Nashua

Siphon Rehabilitation

Submittal Percentages of Total Hours

Hourly Engineering and CAD Split Percentage (Hide row for printing) 1.00 0.60 0.40 Eng.=60% and CAD=40% 0.00 0.00 0.90 0.10
Sheet |Title Tot. Hrs. | Eng. Hrs. | CAD Hrs. |Ci Hrs./Sht 20% BOG 90% 100%
32 {Total Sheets 730 438 292 Total Hours 22.8 0 0 657 73
22.81 13.69 9.13 Average hours per sheet 0 0 394 44
4 |General Drawings 30. 54 36 Comments 22.5 0 0 263 29
G-01 |Cover Sheet and Index of Drawings 10 6 4
G-02 |General Notes, Symbols and Abbreviations 20 12 8
G-03 |Project Area - Key Plans 20 12 8
G-04 | Maintenance of Operations Notes and Part Plans 40 24 16
28 = |Civil Drawings 640 384 256 Comments 22.9
C-01 |General Notes and Siphon Condition Assessment Summary Table 40 24 16
C-02 |Inverted Siphon No. 1 - Nashua River Interceptor | - Site Access Plan 20 12 8 GIS Mapping
C-03 |Inverted Siphon No. 1 - Nashua River Interceptor | - Plan and Profile 20 12 8 Interceptor | - AC#249-9494 Sheet 10 of 25 (Bid 1968 - RD 1975)
C-04 |Inverted Siphon No. 1 - Nashua River Interceptor | - Inlet Structure - Plan and Sections 20 12 8 Interceptor | - AC#249-9495 Sheet 11 of 25 (Bid 1968 - RD 1975)
C-05 |Inverted Siphon No. 1 - Nashua River Interceptor | - Outlet Structure - Plan 20 12 8 Interceptor | - AC#249-9496 Sheet 12 of 25 (Bid 1968 - RD 1975) - Check SDF Drawings
C-06 |Inverted Siphon No. 1 - Nashua River Interceptor | - Outlet Structure - Sections 20 12 8 Interceptor | - AC#249-9497 Sheet 13 of 25 {Bid 1968 - RD 1975) - Check SDF Drawings
C-07 |Inverted Siphon No. 2 - Nashua River Interceptor | - Site Access Plan 20 12 8 GIS Mapping
C-08 |Inverted Siphon No. 2 - Nashua River Interceptor | - Plan and Profile 20 12 8 Interceptor | - AC#249-9499 Sheet 15 of 25 (Bid 1968 - RD 1975)
C-09 |Inverted Siphon No. 2 - Nashua River Interceptor | - Inlet and Outlet Structures - Plan and Sections 20 12 8 Interceptor | - AC#249-9500 Sheet 16 of 25 (Bid 1968 - RD 1975)
C-10 |Inverted Siphon No. 3 - Nashua River Interceptor | - Site Access Plan 20 12 8 GIS Mapping
C-11 |Inverted Siphon No. 3 - Nashua River Interceptor | - Plan and Profile 20 12 8 Interceptor | - AC#249-9501 Sheet 17 of 25 (Bid 1968 - RD 1975)
C-12 |Inverted Siphon No. 3 - Nashua River Interceptor | - Inlet Structure - Plan and Sections 20 12 8 Interceptor | - AC#249-9503 Sheet 19 of 25 (Bid 1968 - RD 1975)
C-13 | Inverted Siphon No. 3 - Nashua River Interceptor | - Outlet Structure - Plan and Sections 20 12 8 Interceptor | - AC#249-9502 Sheet 18 of 25 (Bid 1968 - RD 1975)
C-14 |Inverted Siphon No. 4 - Nashua River Interceptor II - Site Access Plan 20 12 8 GIS Mapping
C-15 Inverted Siphon No. 4 - Nashua River Interceptor II - Plan and Profile 20 12 8 Interceptor II - AC#249-9529 Sheet 17 of 22 (Bid 1968 - RD 1976)
C-16 |Inverted Siphon No. 4 - Nashua River - Inlet and Outlet Structures - Plan and Sections 20 12 8 Interceptor II - AC#249-9530 Sheet 18 of 22 (Bid 1968 - RD 1976)
C-17 |Inverted Siphon No. 5 - Nashua River Interceptor II - Site Access Plan 20 12 8 GIS Mapping
C-18 |Inverted Siphon No. 5 - Nashua River Interceptor II - Plan and Profile 20 12 8 Interceptor Il - AC#249-9527 Sheet 15 of 22 (Bid 1968 - RD 1976)
C-19 |Inverted Siphon No. 5 - Nashua River Interceptor II - Inlet and Outlet Structures - Plan and Sections 20 12 8 Interceptor Il - AC#249-9528 Sheet 16 of 22 (Bid 1968 - RD 1976)
C-20 |Inverted Siphon No. 7 - Salmon Brook at New Searles Road - Site Access Plan 20 12 8 GIS Mapping
C-21 |Inverted Siphon No. 7 - Salmon Brook at New Searles Road - Plan and Profile 20 12 8 Searles Road Trunk Sewer - AC#SP-1681 Sheet ? of ? (Bid 1975 - RD 1976)
C-22 |Inverted Siphon No. 7 - Salmon Brook at New Searles Road - Inlet and Outlet Structures - Plan and Sections 20 12 8 Searles Road Trunk Sewer - ACHSP-1681A Sheet 5 of 5 (Bid 1975 - RD 1976)
C-23 |Inverted Siphon No. 8 - Salmon Brook at Kathy Drive - Site Access Plan 20 12 8 GIS Mapping
C-24 |Inverted Siphon No. 8 - Salmon Brook at Kathy Drive - Plan and Profile 20 12 8 Kathy Drive to Gilboa Hill Sewer - ACHSP-2268 Sheet 5 of 18 (Bid 1982 - RD 1987)
C-25 |Inverted Siphon No. 8 - Salmon Brook at Kathy Drive - Inlet and Outlet Structures - Plan and Sections 20 12 8 Kathy Drive to Gilboa Hill Sewer - ACHSP-2267 Sheet 4 of 18 (Bid 1982 - RD 1987)
C-26 |Standard Details - Sheet 1 40 24 16 Lining Details
C-27 |Standard Details - Sheet 2 40 24 16 Point Repair Details
C-28 [Standard Details - Sheet 3 40 24 16 Erosion Control Details
oO oO

Note 1:

Assumes,

Check
730
Eng. Hrs.
CAD Hrs.

SUMMARY OF LABOR AND COSTS - DRAFT
CITY OF NASHUA, NH
SIPHON REHABILITATION - DESIGN & BIDDING

HAZEN AND SAWYER TEAM BUDGET FOR TASK B2 - Bid Phase Services

TOTAL

TOTAL LABOR &

OTHER

Task Description Director Manager Associate A88°Ci° Siaincer Enginger EManeer Technician oyes "“poLiaRS, INDIRECT INDIRECT DIRECT FIXEDFEE oi las
Rates $88.00 $68.00 $73.00 $53.00 $55.00 $43.00 $39.00 $21.00 OH 179.0% Profit 10.0%
B2.1 Questions/Answers 1 4 0 0 8 0 8 0 21 $1,112 $1,990 $3,102 $0 $310 $3,413
B2.2 Adddenda 1 0 4 0 12 0 4 0 21 $1,196 $2,141 $3,337 $100 $334 $3,771
B2.3 Pre-Bid Conference 0 8 0 0 8 0 0 0 16 $984 $1,761 $2,745 $0 $275 $3,020
B2.4 Bid Tabulation 0 1 0 0 2 0 0 0 3 $178 $319 $497 $0 $50 $546
B2.5 Evaluate Bid Forms 0 1 0 0 4 0 0 0 5 $288 $516 $804 $0 $80 $884
B2.6 Review References 0 2 0 0 2 0 4 0 8 $402 $720 $1,122 $0 $112 $1,234
B2.7 Provide Recommendation to Award 1 1 0 0 4 0 0 0 6 $376 $673 $1,049 $0 $105 $1,154
[Task B1 Totals 3 17 4 0 40 0 16 0 80 | $4,536] $8,119] $12,655] $100] $1,266] $14,021
Assumptions Hours No. Units Units Total oDcs Comment
B2.1 Questions/Answers
1 set of Q&A 20 1 Q&A
B2.2 Adddenda
1 Addenda 12 1 Addenda 12 $ 100.00 printing
B2.3 Pre-Bid Conference
conference 8 1 Conference 8 $ 100.00 Travel