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Wo Design Services & Project Management of Downtown Riverfront Implementation
July 31, 2020

for potential flood mitigation (excavation) and a cantilevered overlook that would take
advantage of the prominent riverfront location. Halvorson will lead the complete Park
design. HL Turner will provide input on floodplain impact constraints. VHB will provide
preliminary roadway design for making Water Street one-way, including signal
moditications at the Water/Main Street intersection, and added parking on Factory Street.
It is assumed the City has approved the one-way direction on Water Street that was
presented during conceptual design.

Lead Consultant: Halvorsen
Support from: VHB, HLT

2.12.4 — 4 Water Street Cantilevered Boardwalk & Ramp:

This important sub area includes the exploration of a new cantilevered ramp that would
connect the lower Renaissance Park to the upper level Main Street and park. HL Turner
will lead the design. VHB will provide input on the boardwalk profile.

HL Turner will manage geotechnical efforts that will be required for the supports that are
planned in the river. HL Turner has provided an allowance estimate for all in-water
geotechnical needs including two boardwalks and the planned stage area in Park de fa
Renaissance.

VHB will provide a 3D terrestrial laser survey of all three buildings where boardwalks are
proposed along buildings. HL Turner requested this survey since they will need to know
exact elevations and locations of the building features including windows, foundations and
the like. The City will provide any required coordination with the building owner and
required property agreements.

Lead Consultant: HL Turner
Support from: VHB

2.12.5 ~ Renovation to Bicentennial Park:

Renovations to this small park adjacent to Main Street will include updates that refresh the
streetscape materials and furnishings to tie together the aesthetics of the Riverfront design
with the Park. The design will also include creation of an ADA compliant pedestrian
walkway to connect Main Street to the new boardwalk at 4 Water Street. The work does
not Include modifications to the existing railings or retaining walls.

Lead Consultant: Halvorson

2.12.6 - New Cantilevered Boardwailc:

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This important sub area includes the design of a new cantilevered boardwalk that would
connect Main Street to the proposed path in area 7. The boardwalk structure will match
the general design of the other proposed boardwalks, Conceptual evaluations point to a
structure that is entirely supported by the adjacent building without need for in-water
supports. The design will include a raised deck area behind the restaurant. HL Turner will
lead the design. VHB will provide input on the boardwalk profile and how and where it
touches down at the proposed paved path. VHB will provide the 3D terrestrial point cloud
survey. The City will provide any required coordination with the building owner and
required property agreements.

Lead Consultant: HL Turner
Support from: VHB

2.12.7 — Multiuse Path

VHB will design a multiuse path from the end of the boardwatk in area 6 to Front Street
and the boardwalk behind the substation. The existing unpaved path does not appear io
meet ADA requirements so VHB will propose profile improvements and an alignment shift
to avoid or minimize floodplain and wetland impacts.

Lead Consultant: VHB
Support from: HL Turner

2.12.8 — Substation Screening

Halvorson will complete the preliminary screening design. Halvorson and the City will interface
with Eversource.

Lead Consultant: Halvorson

2.12.9 - Boardwalk and Floating Dock

HL Turner will lead the design of a boardwalk connection along the river by the substation.
This boardwalk is an alternative to having the path run past the front of the substation
along Front Street. VHB will provide input on the boardwalk profile and how and where it
touches down at the proposed paved path and by the substation. We understand that HL
Turner will be providing bathymetry from FEMA, which will help them understand river
depths where the boardwalk will be over water. HL Turner will arrange geotechnical
services for the boardwalk supports.

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July 31, 2020

The floating dock may or may not be accessed from the boardwalk, depending on grades
and available open water of sufficient depth to make it practical. An alternative to the dock
may be found in the terraced water's edge that is proposed under 2.12.10 below.

Lead Consultant: HL Turner
Support from: VAB

2.12.16 - Existing Trail Improvements

It is assumed that the existing paved path will suffice for the riverside path. This sub area
may include updates to the existing trail that would include trail furnishings, small plazas
for overlooks or pause places, and selected locations for public art. Based on recent
discussions with the city this will be a minimal effort.

This task also includes preliminary design of additional flood storage as mitigation for
proposed filling elsewhere. That would likely require shifting a portion of the path
alignment and possibly altering some parking. HL Turner will provide VHB with guidance
on flood storage needs.

Lead Consultant: VHB
Support from: HL Turner on flood storage needs

2.12.11 - Riverbank Restoration

The space between the river and the existing path along the north side of the river was
cleared by the City in 2020 and the City is conducting annual invasives and vegetation
control. At this stage we have assumed there is not a need for additional design work
along that rivet’s edge other than that discussed in 2.12.10 above, and no scope is
included in preliminary design.

2.12.12- ADA Accessible Ramp to Cotton Transfer Bridge

VHB structural engineers will complete the preliminary design for the ADA ramp. This will
include managing a boring and geotechnical subcontract to obtain the information
required to design the ramp supports. A detailed structural design scope is attached as an
exhibit.

Lead Consultant: VHB

2.12.13 - BAE Trail and Parking Modifications

VHB will develop the 3D design of the trail along the top of the riverbank and adjacent to
the BAE parking lot. VHB will coordinate with BAE since the design will likely have impacts

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to their parking or the parking spaces that they lease to Margaritas. VHB landscape
designers will also provide preliminary design jor the “parklet” near the PanAm bridge and
will design the railings and plantings along the path. VHB will work seek input from Lumen
and F&T on likely lighting design along the path and at the park. VHB will rely on the City
for negotiating any swapping of parking spaces or land between the City and BAE.

Lead Consultant: VHB

2.12.14 - PanAm Bridge Ped Walkway Rehabilitation

VHB’s initial assessment of the existing pedestrian walkway on the bridge is that the long
RR timbers that support the walkway may not meet current pedestrian loading guidelines.
VHB will reach out to PanAm to determine what their plans are for the bridge and to
obtain any records on the walkway construction and maintenance. To establish a definitive
determination on the structural adequacy of the supporting members it would be
necessary to perform a bridge inspection using a track mounted cherry picker type vehicle
that will allow VHB engineers to suspend under the walkway and the bridge to measure
the timbers and assess their condition. This would also require approval from PanAm and
obtaining one-time insurance coverage for the activities. An allowance for the track
mounted inspection vehicle and the railroad insurance is included tn this amendment. A
detailed structural design scope is attached as an exhibit.

Lead Consultant: VHB

2.12.15 - South Side Trail Improvements

VHB will develop the 3D design of the trail along the top of the riverbank. The presence of
asbestos will be assumed for the entire area, and VHB will design the improvements so
excavation will be limited. Techniques such as driven fence posts and light poles will be
explored. The design will not include tree plantings due to the steep slopes and asbestos
related restrictions. Our understanding ts that the City's landscape contractor will grind
stumps and loam and seed the slopes in the area in 2020. The need for additional
plantings is not known or included in this scope.

Lead Consultant: VHB

2.12.16 - ADA Ramp Replacement

VHB will design the replacement of the existing narrow steel pedestrian ramp with a 10
wide paved path on earth fill that is supported by a concrete block or similar retaining wall.
VHB will subcontract a geotechnical firm to obtain the necessary borings and geotechnical

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recommendations. VHB will also coordinate with the City to ensure the new ramp will not
impact the existing sewer line in the area. A detailed structural design scope is attached as
an exhibit.

Lead Consultant: VHB

2.12.17 - 60 Main Street Boardwalk and Trail

HL Turner will lead the design for the boardwalk and associated ADA ramp that will
account for the elevation difference between Main Street and the parking lot behind 60
Main Street. VHB will provide input on the boardwalk profile and how and where it
touches down at the proposed paved path. HL Turner has determined that supports will
not be needed in the river and that the building will support the boardwalk. VHB will
provide a terrestrial point cloud survey.

VHB will provide design of the path than will lead along the river from the ADA ramp to
the ADA ramp behind the library. This path may result in utility pole and/or parking lot
impacts, and it should also be designed to minimize fill in the floodplain if possible.

The City will provide any required coordination with the building owner and required
property agreements.

Lead Consultant: HL Turner for the boardwalk, VHB for the trail

2.12.17a - Pearson Ave Alternative Connection

In the event the 60 Main Street boardwalk and path along the river described above are
found to be infeasible, VHB will direct fts attention and the associated design fee to an
alternative pedestrian connection along Pearson Street instead.

Lead Consultant: VAB

2.12.18 - Wayfinding

At the City’s direction wayfinding will be added to the scope of services during final
design.

lead Consultant: VHB

2.2, River Hydrology

Any of the design that would result in fill within the floodplain and floodway must be
coordinated with HL Turner since they will maintain the river hydraulics model.

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HL Turner has developed 2-, 5-, 10-, 50-, 100- and 500- year peak Nashua River flows
using data/analysis of stream flow records from the USGS’ Pepperell, MA gage, transposed
downriver to the project site.

HL Turner will utilize their project design river hydraulic model using the current effective
FEMA HEC-RAS model, and determine ‘low-water surface elevation profiles for the 2-
through 500-year peak river flows, and the FEMA regulatory floodway zone.

Based on the agreed upon project design flood resiliency and structural criteria, HL Turner
will select and insert the design plan features into the project design hydraulic river model.

HL Turner will provide VHB and the Project Team the results of the hydraulic impacts (Le.
water surface elevation rises, floodway impacts and river velocity increases) identifying
impacts and recommendations on how to deal with the impacts (i.e. removal or
reorientation of certain plan features, or creation of mitigation areas).

Lead Consultant HL Turner
Support from: VHB, Halvoson

2.3 Permitting

Permit applications will be prepared after Phase 2 when the impacts are well defined, but
during Phase 2 the design team will be cognizant of the potential permitting implications
of every aspect of the design when important design decisions are betng made. As the
design progresses VHB environmental specialists will advise the design team relative to
permitting implications. In addition, The HL Turner Group will provide crucial input on any
in-stream or shoreline work that couid potentially affect flood levels.

Lead Consultant: VHB
Support from: HL Turner
2.4 Utility Coordination

Utility coordination at this stage is assumed to be minimal since the designs and impacts
are preliminary. A small fee is included to cover correspondence and issuing plans to
potentially impacted utility companies.

Lead Consultant: VHB

2.5 Property Owner Coordination

Considering budgetary constraints and the coordination that has occurred during
conceptual design, a minimal fee is included for this task. It is assumed the City will
arrange any calls needed with affected property owners.

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2.6 Environmental Testing

Due to budgetary constraints environmental testing is not included in this phase. If this
service is added to the contract VHB will work with one of it's selected environmental
testing forms with experience in asbestos testing.

2.7 Public and Stakeholder Engagement

At the city’s urging the proposed approach to public engagement during Phase 2 will be
significantly scaled back due to budgetary constraints and less of a need to solicit input on
the designs during this phase.

VHB will participate in one public meeting that will likely be a project update and an
opportunity for additional input and interaction. VHB will also participate in one City
Leaders meeting to provide a project update. The design team will not produce special
visualization graphics for these meetings, but will instead rely on previous graphics,
representative photos and the progress plans that are being developed during this phase.

Lead Consultant: VHB
Support from: Halvorson

2.8 Phase 2 Project Meetings

The design team will participate in regularly scheduled project meetings with the City at
which a range of design and project development topics will be discussed. These meetings
will generally be bi-weekly conference/video calls as needed to provide an opportunity to
coordinate activities and to keep the project on track. We assume there will be eight (8)
scheduled project coordination calls with the City during Phase 2, and four (4) unscheduled
calls / meetings.

Lead Consultant: VHB
Support from: All
Estimated Duration: throughout Phase 2

2.9 Preliminary Cost Estimating

VHB will manage and assemble cost estimates for each of the project components from
the design team members in their respective disciplines. The HL Turner Group will provide
costs for the proposed boardwalk and in-water features, and VHB and Halvorson will
provide costing for site-civil, ADA ramp, paths, streetscape, and landscape features. Cost
estimates will be based on major items and appropriate contingencies, We anticipate
aligning the cost estimates with each of the so called “sub-projects” that evolve from the

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conceptual design such that they could easily be advanced on different or combined tracks
to construction if a need arises.

lt is our Understanding that the City may bring tn a construction firm to assist with the cost
estimating during the preliminary design phase.

Lead Consultant: VHB
Support from: All

2.10 Project Management

VHB has included a small fee to perform regular project management tasks with the City
and the design team.

2.11 Lighting

The majority of the Riverfront lighting design has already been advanced under an existing
City contract by Lumen Design Studios with support from Fitzemeyer & Tocci for power
supply. There are still known gaps in the design, however, they will be addressed during
Phase 3 final design when the riverfront design is better defined. A small allowance has
been included in Phase 2 for Lumen Design and Fitzemeyer & Tocci so the design team
can seek their input on lighting new components of the proposed riverfront
improvements, such as Park de la Renaissance.

Lead Consultant: Lumen Design Studio & Fitzemeyer & Tocci,
Estimated Duration: ongoing

2.13 Park Pavilion Architectural Desian

At the suggestion of Halvorson Design, an architect will be used during preliminary design
to better define the design of the pavilion that will serve as a focal point in Parc de la
Renaissance. Their proposal is included as an exhibit.

SERVICES NOT INCLUDED

The following services are either not anticipated or budgeted for this phase and are
therefore not included in this amendment.

e Property owner negotiations or easement plans

« Traffic studies or analysis

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July 31, 2020

° Marine engineering

e Drainage studies, analysis, or design
e 3D visualizations

e Soils testing for hazardous materials

SCHEDULE

VHB proposes to complete the preliminary design phase in 3 months trom receiving noiice to
proceed. This schedule is dependent on receiving topographic survey files in a timely manner,
and is subject to extension due to delays by others in decision making, responsiveness or
reviews.

RIGHT TO RELY

lt ts understood that VHB will perform services under the sole direction of the City. The City shall
provide VHB with project-related technical data including, but not limited to, topographic and
right-of-way surveys, existing plans or studies, GIS data sets.

COMPENSATION

VHB and its subconsultants will perform the Scope of Services on a time and materials basis. The
estimated Upset Limit for this Scope of Services is $ 500,000. including labor, overhead, profit
and direct expenses. VHB direct expenses will be billed at their actual cost without markup and
subconsultants will be billed at their actual cost without markup.

VHB $ 189,300.00
Halvorson Design (ighe & Bond) § 89,700.00
H.L. Turner § 90,000.00
Lumen Design $ 3,000.00
Fitzmeyer & Tocci G 2,000.00
Geotechnical Services (Allowance) § 68,000.00
Point Cloud Building Survey (VHB) § 7,000.000
RR Bridge inspection Vehicle § 3,500.00
Railroad Insurance (Allowance) § 5,000.00
Touloukian & Touloukian Architects $ 42,500.00
PHASE 2 AMENDMENT TOTAL: $ 500,000.00

The execution of this amendment provides authorization for the services described above.

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July 31, 2020

APPROVED FOR APPROVED FOR
VANASSE HANGEN BRUSTLIN, INC. CITY OF NASHUA, NEW HAMPSHIRE
(ENGINEER) (CLIENT)
By: By:
Title: Title:

Date: Data: