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hb Design Services & Project Management of Downtown Riverfront Implementation
October 31, 2019

2. Control survey locating the monuments and historic control to tie the properties
together.

3. Location of monumentation necessary to determine the boundary lines.

4. Right of Way research at the City Clerk’s and Engineer's offices necessary in
determining the right of way limits of roads within and adjacent to the project limits.

5. Boundary analysis and determinations by HSI's licensed land surveyor.

6. Computations and compilations of the survey data.

1.2.2 Existing Conditions Survey and Plan

A. HSI shall perform a Topographic Existing Conditions survey of portions of properties
between Broad Street Parkway and Main Street as outlined in Exhibit B.1 attached. The
survey includes approximately 9 acres and 5,000 LF of road and river bank locations. The
survey shall include the following:

1. Location and elevation of existing structures.

2. Elevations, locations, size of existing sewerage and drainage utilities within the survey
area.

3. Location of existing utilities (well, gas, telephone and electric).

4. Location of edge of pavement of abutting streets.

5. Location of existing features (tree lines, signs, walls, etc.).

6. Location of wetland flagging provided by VHB wetland scientists.

B. Upon completion of the survey HSI shall prepare 1”=40’ scale base map for use for
design of the proposed riverfront improvements by other project team members.

These tasks assume adequate monumentation exists on or near the property to make an
accurate boundary determination. If adequate monumentation does not exist, additional
research and field work may be necessary. VHB will contact the City prior to HSI performing any
additional work to discuss the costs associated with any additional work and a mutually agreed
upon Contract Amendment shall be executed prior to continuation of the work.

Note that in order to perform their work, HSI staff may need to access abutting properties.
Although HSI will make every effort to locate the potential encroachments and boundary
monuments without trespassing on abutting properties, it is advised that the City obtain verbal
or written permission for temporary access by the field crews. If physical access is necessary, but
denied by the abutters, then the City may want to seek legal advice on how to proceed.

DELIVERABLES

HSI’s New Hampshire Licensed Land Surveyor shall sign and stamp the final plans and mail up to
six (6) prints to the City and project team. In addition, HSI will provide an AutoCad drawing file
with the associated survey data for use by the design team and the City.

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October 31, 2019

In the event additional topographic and/or bathymetric survey requirements are identified as
design development proceeds, they will be addressed in subsequent contract amendments.

Lead Consultant: HSI
Support from: VHB, Halvorson
Duration: Phased over 14 weeks

1.3 Environmental Documentation

During this conceptual phase VHB will supplement the high-level, GiS-based environmental
resource data gathering that was completed for the Riverfront Plan with detailed documentation
and delineation, VHB wetland scientists will complete the required resource delineation and
documentation along the shoreland for survey by HSI. Environmental resource and constraint
information will be supplemented using a combination of database research and
communication with local, state, and federal agencies. VHB will also review all relevant
documentation that the City may have compiled from the private developments that surround
the riverfront.

Lead Consultant: VHB
Support from: Halvorson
Estimated Duration: 3 weeks, pending ensuing winter conditions

1.4 Conceptual Design

VHB will work closely with Halvorson and H.L. Turner to develop conceptual design plans that
include more detail than the schematics and illustrations that were in the Riverfront Plan. We
expect that the plans will initially be shown on ortho photos amended with available GIS
information and the City’s 2-foot contours since ground survey will be ongoing during the early
conceptual design phase. VHB and Halvorson will transition to using the ground survey
information as it becomes available from HSI.

As the design progresses the design team will be mindful of the “Six Big Ideas” that were
defined during the Riverfront Plan: Connectivity, Environmental Stewardship, Access to the River,
Recreation and Green Space, Flood Resiliency and Economic Development.

Early during the conceptual design phase, the project team will complete due diligence efforts
to better understand all relevant constraints and opportunities within the project limits. The
project team will also vet design alternatives during this phase with input from the City, other
stakeholders and the public as appropriate. Deliverables during this phase will include sketch
plans and design graphics of sufficient detail to convey the intended improvements. The design
team will also develop approximately eight (8) 3D renderings of specific project features to
illustrate the envisioned improvements to the public and other stakeholders.

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Design Services & Project Management of Downtown Riverfront Implementation
October 31, 2019

Following are descriptions of the various project components as they are currently understood
along with proposed roles and responsibilities of the applicable design team members for each
component. The below map provides a key to each of the primary numbered project
components. Estimated Duration: 16 weeks

1.4.1 - New Access at Factory St. Extension:

Task: Define the accessible route from Clock Tower Place to Factory Street Extension. This
may require ramps and/or creative use of the available space to satisfy ADA requirements.

Product: Provider up to two (2) design alternatives including plans, profiles, and sections as
appropriate to define the proposed improvements and to illustrate proposed grading.

Lead Project Team Consultant: VHB
Support from: HSI, Halvorson

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October 31, 2019

1.4.2 - Existing ADA Ramp and Cotton Transfer Pedestrian Bridge:

Task: The project includes no significant changes to the existing south side ramp and ped
bridge. Elements that may be included in this existing project facility include lighting and
signage. Lumen Design Studio has already included the Cotton Transfer Bridge in their
existing contract with the City and minimal additional effort is required during Phase 1 of
this project.

Lead Consultant: VHB
Support from: Halvorson, Lumen Design Studio, Fitzemeyer & Tocci

1.4.3 - Redesign of Factory St Extension:

This area will include modifications to the existing Factory St Extension to better
accommodate pedestrians and bicyclists, but to continue to provide access for emergency
vehicles and maintenance operations. The improvements are expected to include lighting,
signage, street furniture and possibly new pedestrian railings and river's edge
enhancements. Care will be taken to maintain some trees and protect the stability of the
existing walls. The design team will also evaluate replacing existing roadway paving with
new materials that would reinforce the design aesthetic of the Riverwalk System and
potentially allow stormwater infiltration. The design may include an over-water section of
path to preserve parking in the vicinity of Perk de la Renaissance. The existing building in
the vicinity of the Cotton Transfer Bridge may also be repurposed for activities such as
boat rentals, or passibly removed.

The work in this segment will include close coordination with the property owner.

Product: Provide up to two (2) design alternatives including plans, profiles, critical sections,
and precedent images as appropriate to define the proposed improvements.

Lead Consultant: VHB
Support from: Halvorson

1.4.4 - Redesign Parking Lot + Renaissance Park:

The conceptual design efforts in this area will include further development to test the
concept ideas in the Riverfront Plan. The design may include filling lands adjacent to
Water Street to create an amphitheater, new pathways, revised parking, waterfront plazas
and landscape enhancements that include planting, hardscape, street furnishings and
lighting. This area may also be explored for potential flood mitigation (excavation) and a
cantilevered overlook that would take advantage of the prominent riverfront Jocation.

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October 31, 2019

Halvorson may also consider water features (fountain) for further design by specialty
consultants by amendment.

Product: Prepare up to three (3) design alternatives including plans, profiles, critical sections,
and precedent images as appropriate to define the proposed improvements.

Lead Consultant: Halvorson
Support from: VHB, HLT

1.4.5 - New 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. The
expectation is that the boardwalk structure would be similar to the existing cantilevered
boardwalk at the Peddler’s Daughter building. This may include a ramp and/or a stair
system to account for the grade change. If determined feasible, this element would be
advanced through design. If determined infeasible, this element would be removed and
possibly supplemented by sidewalk enhancements that connect Renaissance Park via
Water Street to Main Street.

Due diligence efforts by HL Turner during this phase will include interior building
inspections to determine the potential for attaching the cantilevered boardwalk to the
building.

Product: Plans and sections and precedent images as appropriate to define the proposed
improvements.

Lead Consultant: HL Turner

Support from: VHB, Halvorson, Lumen Design Studio, Fitzemeyer & Tocci

1.4.6 - Renovation to Bicentennial Park:

Renovations to this small park adjacent to Main Street may include updates that refresh
the streetscape materials and furnishings to tie together the aesthetics of the Riverfront
design with the Park. There may be opportunities to update how public art is displayed in
the park and lighting and ADA modifications may also be appropriate. The work does not
include modifications to the existing railings or retaining walls other than modifications
that may be part of the cantilevered boardwalk in area 5 above.

Product: Provide two (2) design alternative including plans, sections, sketches and precedent
images as appropriate to define the proposed improvements.

Lead Consultant: Halvorson
Support from: Lumen Design Studio, Fitzemeyer & Tocci, VHB

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October 31, 2019

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1.4.7 - New Cantilevered Boardwalk:

This important sub area includes the exploration of a new cantilevered boardwalk that
would connect Main Street to the existing trail in area 9. The expectation is that the
boardwalk structure would be similar to the existing cantilevered boardwalk at the
Peddler’s Daughter building. If determined feasible, this element would be advanced
through design. If determined infeasible, this element would be removed and possibly
replaced by pedestrian enhancements in sub-area 8.

Due diligence efforts by HL Turner during this first phase will include interior and exterior
building inspections to determine the potential for attaching the cantilevered boardwalk to
the building.

Product: Plans, sections, sketches and precedent images as appropriate to define the
proposed improvements.

Lead Consultant: HL Turner
Support from: Halvorson, VHB, Lumen Design Studio, Fitzemeyer & Tocci

1.4.8 - Multipurpose Path adjacent to Railroad

The potential to introduce a multipurpose path area adjacent to the existing Railroad to
provide a formal multimodal connection to Main Street by Riverside Barbeque Company
will be studied in this sub-area if it appears that the cantilevered boardwalk in the above
section will not be feasible. This study will explore an accessible route from Main Street,
paralleling the tracks heading east towards the parking lot and existing trail. This would
likely involve redefining the paved surfaces to clearly demarcate the multiuse path apart
from the railroad track, relying on obtaining rights to do so. If determined to be feasible,
this would be advanced through design development only if it is determined that the
cantilevered boardwalk alternative is not feasible.

Product: Provide plans, typical cross sections, and sketches as appropriate to define the
proposed tmprovements.

Lead Consultant: VHB
Support from: Halvorson

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Vhb Design Services & Project Management of Downtown Riverfront Implementation
October 31, 2019

1.4.9 - Multipurpose Trail

This subarea includes updates to the existing trail that may include: reconstruction and
repaving of the trail if necessary or desired, pedestrian lighting, trail furnishings, small
plazas for overlooks, and selected locations for public art. This may also include screening
of the power substation. VHB will rely on information from HL Turner related to floodplain
elevations and restrictions and will likely avoid adding fill as part of any trail enhancements
it possible,

VHB will also examine potential landscape enhancements along the river's edge to
enhance aesthetics and control invasives.

Product: Plans, typical cross sections, sketches and one (1) perspective as appropriate to
define the proposed improvements.

Lead Consultant: VHB
Support from: Halvorson, HL Turner, Lumen Design Studio, Fitzemeyer & Tocci

1.4.10 - New Floating Dock + Access Ramp.

This area will include the assessment and conceptual design of a new pedestrian ramp and
floating dock to provide improved river access. The ramp and dock are envisioned to be
floating to avoid concerns with filling within the floodway, and removable to prevent
winter damage. HL Turner will conduct early due diligence to determine the configuration
and feasibility of this structure.

Product: Plans, sections and sketches as appropriate to define the proposed improvements.

Lead Consultant: HL Turner
Support from: VHB, Halvorson

1.4.11 - Existing Trail Improvements

This sub area may include updates to the existing trail that would include: reconstruction
and repaving of the trail where appropriate or necessary, lighting, trail furnishings, small
plazas for overlooks or pause places, and selected locations for public art. This area may be
explored for potential flood storage in upland areas if flaod mitigation is needed due to
proposed filling elsewhere,

Product: Plans, typical cross sections, sketches and one (1) perspective as appropriate to
define the proposed improvements.

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vhb Design Services & Project Management of Downtown Riverfront Implementation
October 31, 2019

Lead Consultant: VHB
Support from: Halvorson, HL Turner

1.4.12 - Riverbank Restoration + New Access

This sub area will likely include enhancing the space between the paved trail and the
water's edge. VHB will examine potential improvements along the river's edge to enhance
aesthetics, improve visibility and access to the river, conduct bank stabilization, and
potentially treat stormwater. There may also be opportunities for small overlooks, and
selected locations for display of public art, signage and lighting. The City is currently
addressing the invasives problem in advance of this project, but there may be
opportunities to modify the ground cover on the banks to mitigate invasives long term.
VHB will rely on guidance from HL Turner on floodplain elevations and restrictions on
filling.

Product: Include up to two (2) design alternatives including plans, typical cross sections,
sketches and one (1) perspective as appropriate to define the proposed improvements.
Lead Consultant: VHB

Support from: AL Turner, Halvorson

1.4.13- ADA Accessible Ramp to Cotton Transfer Bridge

An ADA accessible bike/pedestrian ramp will be developed to connect the ground level
multiuse path up to the Cotton Transfer pedestrian bridge. The intent will be to utilize
similar design elements as the existing ADA ramp on the apposite side of the river. The
work will be done with consideration for avoiding impacts to the floodplain and floodway.
VHB will complete the design with input from Halvorson and will coordinate with Lumen
Design Studio and Fitzemeyer & Tocci for lighting the structure. This project component
may be a good candidate for an accelerated schedule and “early success” assuming
environmental permitting will not hold it back.

Product: Provide up to two (2) design alternatives including plans, sections and sketches as
appropriate to define the proposed improvements.

Lead Consultant: VHB
Support from: HL Turner, Lumen Design, Fitzemeyer & Tocci

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vhb Design Services & Project Management of Downtown Riverfrant implementation
October 31, 2019

1.4.14 - Concept Design for Trail

This sub area includes the conceptual design of a future trail that will connect westerly
toward the broad Street Parkway and possibly beyond. The design will also account for a
potential future multi-use bridge connection across the river, including planning for likely
structure support locations. This area will require close coordination with the land owner to
determine how the trail would integrate into their development plans.

Product: Provide up to two (2) design alternatives including plans, typical cross sections, and
sketches as appropriate to define the proposed improvements.

Lead Consultant: VHB
Support from: Halvorson, HSI

1.5 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.

HL Turner will develop 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 create a project design river hydraulic model using the current effective FEMA
HEC-RAS model, and determine flow-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 Concept Plan features into the project design hydraulic river model.

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

Lead Consultant: HL Turner
Support from: VHB, Halvoson
Estimated Duration: 10 weeks

1.6 Lighting

It is understood that the majority of the conceptual 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 may still be a need to involve these team members

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