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ITEM 604.4 - REPAIR OF EXISTING STRUCTURES
A. SCOPE

This work consists of repairing existing structures below 12” from the bottom of existing casting
frame.

B. MATERIALS AND CONSTRUCTION

The contractor shall include all labor, materials, equipment, and transportation necessary to
repair existing structures other than within the top 12 inches below the bottom of casting frame.
Repairs in that section shall not be paid under this item.

The Contractor is responsible for the management of stormwater to all structures altered/dropped
for paving operations for the duration of the project until final pavement has been placed and
accepted by the City and/or the Engineer. The Contractor shall prevent any materials from
entering drain and sewer structures from this operation and shall clean out said structures if any
material enters.

Mortar shall comply with NHDOT Section 707. Brick shall be sound, hard, and uniformly
burned brick, regular and uniform in shape and size, of compact texture, and satisfactory to the
Engineer. Bricks shall comply with ASTM C32, for Grade SS, hard Brick.

Mortar shall be tooled into every vertical joint between bricks prior to installing a new horizontal
brick layer. Mortar between brick layers shall be 3/8” thick and fully cover all bricks in the layer.
Use of the weight of castings and additional brick layers to facilitate joint filling and further
spreading of mortar is not permitted. All brickwork shall be sealed on the outside and inside of
the structure with mortar. The casting frames shall be set in a ring of mortar extending to the
outer edge of the masonry. Mortar shall be placed on top of the bottom flange and smoothly
finished to have a slight slope that will shed water away from the frame.

All mortar shall be mixed with a cement mixer as approved by the Engineer. Mixing mortar by
hand/shovel will not be permitted.

Unless otherwise noted herein, this work shall conform to the latest approved City of Nashua
Standard Specifications for Road Construction, City of Nashua Standard Specifications for
Sewers and Drains, and the latest approved NHDOT Standard Specifications for Road and
Bridge Construction. The most stringent specification shall apply unless otherwise directed by
the Engineer.

C. MEASUREMENT AND PAYMENT
Payment for the Repair of Existing Structures shall be at the contract unit price per vertical foot

to the nearest 0.1 of a foot. This payment shall include all materials, labor, equipment, and all
else needed to complete the work under this item.

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Contractor shall record the vertical feet of repair completed for each structure as identified by
Nashua’s GIS naming system, and the total vertical feet of repair for each street. Payment is
contingent upon submittal of quantities in a per structure, and per street format.

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ITEM 604.45 - ADJUSTING TO GRADE EXISTING CASTINGS
A. SCOPE

This work consists of adjusting castings to the new final pavement surface elevation. Any repair
needed to the existing structure within the 12 inches below the bottom of casting shall be
included and performed under this item. Any further repair needed to the existing structure shall
be performed and paid under Item 604.4 Repair of Existing Structures.

B. MATERIALS AND CONSTRUCTION

This work shall include all labor, materials, equipment and transportation necessary to adjust the
existing castings to the new street or new ground surface elevation.

All materials, labor, equipment, and transportation required to excavate, to lower structure,
remove the plate and place plate at locations of castings lowered to facilitate reclaim and milling
operations shall be subsidiary to Item 604.47. The Contractor is responsible for the management
of stormwater to all structures altered/dropped for paving operations for the duration of the
project until final pavement has been placed and accepted by the City and/or the Engineer. The
Contractor shall prevent any materials from entering drain and sewer structures from this
operation and shall clean out said structures if any material enters.

Mortar shall comply with NHDOT Section 707. Brick shall be sound, hard, and uniformly
burned brick, regular and uniform in shape and size, of compact texture, and satisfactory to the
Engineer. Bricks shall comply with ASTM C32, for Grade SS, hard Brick.

Mortar shall be tooled into every vertical joint between bricks prior to installing a new horizontal
brick layer. Mortar between brick layers shall be 3/8” thick and fully cover all bricks in the layer.
Use of the weight of castings and additional brick layers to facilitate joint filling and further
spreading of mortar is not permitted. All brickwork shall be sealed on the outside and inside of
the structure with mortar. The casting frames shall be set in a ring of mortar extending to the
outer edge of the masonry. Mortar shall be placed on top of the bottom flange and smoothly
finished to have a slight slope that will shed water away from the frame.

All mortar shall be mixed with a cement mixer as approved by the Engineer. Mixing mortar by
hand/shovel will not be permitted.

Hot mix asphalt shall comply with relevant provisions of these specifications.

Raised structures greater than 2 inches shall be provided with asphalt fillets until the wearing
course is paved. The Engineer may direct the contractor to install fillets at critical casting
locations.

Unless otherwise noted herein, this work shall conform to the latest approved City of Nashua
Standard Specifications for Road Construction, City of Nashua Standard Specifications for
Sewers and Drains, and the latest approved NHDOT Standard Specifications for Road and
Bridge Construction. The most stringent specification shall apply unless otherwise directed by
the Engineer.

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C. MEASUREMENT AND PAYMENT
Payment for Adjusting to Grade Existing Castings shall be at the contract unit price specified for

each. This payment shall include all materials, labor, equipment, and all else needed to complete
the work under this item.

Contractor shall record the number and location of castings adjusted for each street. Payment is
contingent upon submittal of quantities in a per structure, and per street format.

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ITEM 604.46 —- REPLACE CASTING

A. SCOPE

This work consists of replacing triangular, recessed, small diameter, and broken manhole frames
and covers, and catch basin frames and grates as shown on the drawings or as directed by the
Engineer. Any repair needed to the existing structure within the 12 inches below the bottom of
the casting shall be included and performed under this item. Any further repair needed to the
existing structure shall be performed under Item 604.4.

B. MATERIALS AND CONSTRUCTION

This item shall include all labor, materials (except for frames, grates and covers), equipment, and
transportation necessary to replace castings, and to set them at new overlay elevation. Frames,
covers, and grates will be provided by the City of Nashua at 9 Stadium Drive in Nashua. This
item is to include removal of existing frame and cover, transport to the Wastewater Treatment
Facility located at 2 Sawmill Road in Nashua, transportation of new frames and covers from 9
Stadium Dr in Nashua to work area, placement and all excavation and pavement restoration
work,

All materials, labor, equipment, and transportation required to excavate, to lower structure,
remove the plate and place plate at locations of castings lowered to facilitate reclaim or milling
operations shall be subsidiary to Item 604.47. The Contractor is responsible for the management
of stormwater to all structures altered/dropped for paving operations for the duration of the
project until final pavement has been placed and accepted by the City and/or the Engineer. The
Contractor shall prevent any materials from entering drain and sewer structures from this
operation and shall clean out said structures if any material enters.

The Contractor is responsible for the management of stormwater to all structures altered/dropped
for paving operations for the duration of the project until final payment has been placed and
accepted by the City and/or the Engineer.

Mortar shall comply with NHDOT Section 707. Brick shall be sound, hard, and uniformly
burned brick, regular and uniform in shape and size, of compact texture, and satisfactory to the
Engineer. Bricks shall comply with ASTM C32, for Grade SS, hard Brick.

Mortar shall be tooled into every vertical joint between bricks prior to installing a new horizontal
brick layer. Mortar between brick layers shall be 3/8” thick and fully cover all bricks in the layer.
Use of the weight of castings and additional brick layers to facilitate joint filling and further
spreading of mortar is not permitted. All brickwork shall be sealed on the outside and inside of
the structure with mortar. The casting frames shall be set in a ring of mortar extending to the
outer edge of the masonry. Mortar shall be placed on top of the bottom flange and smoothly
finished to have a slight slope that will shed water away from the frame.

All mortar shall be mixed with a cement mixer as approved by the Engineer. Mixing mortar by
hand/shovel will not be permitted.

Hot mix asphalt shall comply with relevant provisions of these specifications.

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Raised structures greater than 2 inches shall be provided with asphalt fillets until the wearing
course is paved. The Engineer may direct the contractor to install fillets at critical casting
locations.

Removed castings shall not be stored on private property. They shall be stored in the City ROW
without impeding vehicular, bicycle, and pedestrian traffic. All casting shall be removed within a
timely manner.

Unless otherwise noted herein, this work shall conform to the latest approved City of Nashua
Standard Specifications for Road Construction, City of Nashua Standard Specifications for
Sewers and Drains, and the latest approved NHDOT Standard Specifications for Road and
Bridge Construction. The most stringent specification shall apply unless otherwise directed by
the Engineer.

C. MEASUREMENT AND PAYMENT
Payment for Replace Casting shall be at the contract unit price specified for each. This payment
shall include all materials, labor, equipment, and all else needed to complete the work under this

item.

Contractor shall record the number and locations of castings replaced for each street. Payment is
contingent upon submittal of quantities in a per structure, and per street format.

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ITEM 604.47 - DROP AND PLATE CASTING
A. SCOPE

This work consists of removing existing casting, removing brick and mortar supporting the
casting, plating the hole over the structure, and backfilling the hole. Excavation, plate removal,
and final adjustment to proposed grade will be covered under Items 604.4, Item 604.45, and Item
604.46 as determined by the Engineer.

B. MATERIALS AND CONSTRUCTION

This work shall include all labor, materials, equipment and transportation necessary to drop and
plate the existing manhole castings prior to reclaim and milling as directed. Plates shall be of
sufficient strength for traffic loading. Contractor shall be responsible for keeping records
identifying, with measurements, where all dropped castings are located. Contractor is responsible
for management of all castings once they are removed from the manholes, and for locating all
dropped castings when they need to be adjusted.

Removed castings shall not be stored on private property.

At locations where structures have been lowered, Contractor shall backfill to surface with
compacted gravel or provide a temporary bituminous patch.

The Contractor shall be responsible to maintain the gravel surface or temporary bituminous patch
with particular attention to potential washouts during storm events.

Should compacted gravel not be satisfactorily maintained, the Contractor shall be required to
construct a temporary bituminous patch at all remaining locations where structures are lowered.

Unless otherwise noted herein, this work shall conform to the latest approved City of Nashua
Standard Specifications for Road Construction, City of Nashua Standard Specifications for
Sewers and Drains, and the latest approved NHDOT Standard Specifications for Road and
Bridge Construction. The most stringent specification shall apply unless otherwise directed by
the Engineer.

C. MEASUREMENT AND PAYMENT
Payment for Drop and Plate Casting shall be at the contract unit price specified for each. All
castings regardless of size will be paid for as one (1) each. This payment shall include all

materials, labor, equipment, and all else needed to complete the work under this item.

Contractor shall record the number and location of castings dropped and plated for each street.
Payment is contingent upon submittal of quantities in a per structure, and per street format.

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ITEM 608.34 —- 4” REINFORCED CONCRETE SIDEWALK
ITEM 608.36 — 6” REINFORCED CONCRETE SIDEWALK

A.

SCOPE

This work shall consist of constructing four inch (4”) thick reinforced sidewalks, five feet
(5’-0”) wide of Portland cement concrete with synthetic microfibers at a dose rate of 1.5
Ibs. per cubic yard, or six inch (6”) thick curb landings of reinforced concrete with 6 x 6 —
W 2.9 x W 2.9 Steel mesh as shown on the plans or as ordered by the Engineer. Work
includes but is not limited to furnishing, placing, finishing, curing, stripping, coating and
cleanup work associated with the installation of the sidewalk or walkway. Existing
subgrade materials will be evaluated to be reused or will need to be excavated and
replaced with 6” of compacted crushed gravel. The sidewalk shall have a maximum cross
slope of 2%, reinforced (if required) and graded to properly drain. The curb ramps shall
have a maximum cross slope of 2% and maximum running slope of 8.33% but shall not
require the ramp length to exceed 15’ if chasing grade. If the road grade is greater than
2% the ramp or edge of a flush landing may be warped to meet the street running grade.
Curb ramps require a level (2% or less slope in any direction) 5’x5’ reinforced 6” thick
landing wherever a turning maneuver is required. All curb ramps shall be installed with a
flush transition to the road surface.

MATERIALS AND CONSTRUCTION

The Contractor shall furnish all materials, labor and equipment necessary for constructing
concrete sidewalk or walkway in accordance with relevant provisions of Section 608 and
Section 520 of the NHDOT Standard Specifications for Road and Bridge Construction,
latest edition. Reinforcement, fibers, and coating shall be subsidiary. Removal of
existing sidewalk and curbing, earth excavation and crushed gravel subgrade shall be
subsidiary. Transportation and disposal of the removed material shall be the
responsibility of the Contractor. Detectable Warning shall be installed at all curb ramps.

MEASUREMENT AND PAYMENT

Four-inch (4”) reinforced concrete sidewalk will be paid for at the contract price per
square yard, complete in place. The area occupied by the curb will not be included in the
final pay quantity. Six-inch (6”) reinforced concrete landings will be paid for at the
contract unit price per square yard, complete in place. Both Items shall include full
compensation for material, equipment and labor to complete this portion of the Bid
Schedule. Relocation of existing small plants and bushes shall be incidental to this item.

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ITEM 608.54 - DETECTABLE WARNING DEVICES, CAST IRON

A.

top diameter of .
50% 65% of the base diameter \, 2 85. min
\ . i
base diameter of L357
7 — “. —
0.9-1.4 (23-36 mm) ~ L
(a)
elevation
(enlarged)

SCOPE

This work shall consist of furnishing and installing a detectable warning surface, concrete
sidewalk pad and tip-down ramp, and accessories at locations shown on the plans, as
specified herein, or as ordered including any and all required surface preparation.

MATERIALS AND CONSTRUCTION

Detectable warnings shall be installed at sidewalk ramps where a sidewalk crosses a
public vehicular way, excluding unsignalized driveway crossings. Detectable warnings
shall measure 24” in the direction of travel and extend the full width of the sidewalk ramp
and the edge nearest the curb line shall be located 6 to 8” from the face of curb line.

Detectable warnings shall consist of a surface of truncated domes and shall comply with
section 705 of the ADA and ABA Guidelines for Buildings and Facilities. Truncated
domes in a detectable warning surface shall have a base diameter of 0.9 inch (23 mm)
minimum and 1.4 inches (36 mm) maximum, a top diameter of 50 percent of the base
diameter minimum to 65 percent of the base diameter maximum, and a height of 0.2 inch
(5.1 mm). Truncated domes shall have a center-to-center spacing of 1.6 inches (41 mm)
minimum and 2.4 inches (61 mm) maximum, and a base-to-base spacing of 0.65 inch (17
mm) minimum, measured between the most adjacent domes on a square grid. Detectable
warning surfaces shall be either natural patina or federal yellow cast iron as directed by
the engineer. The detectable warning shall be placed on a Portland cement concrete
sidewalk pad.

Figure 705.1 Size and Spacing of Truncated Domes
MEASUREMENT AND PAYMENT
This item shall be measured by the Square Yard of Detectable Warning Devices installed.
Payment for this item shall be at the contract unit price per Square Yard. This payment

shall also include all materials, labor, equipment, and all else needed to complete the
work under this item.

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ITEM 609.01 - GRANITE CURBING
A. SCOPE

This work shall consist of constructing straight or curved granite curb as shown on the plans or
as ordered by the Engineer. Work includes furnishing, placing, and cleanup work associated
with the installation of the curb. Curb shall be installed on a properly graded, compacted bed of
crushed gravel subgrade.

B. MATERIALS AND CONSTRUCTION

The Contractor shall furnish all materials, labor and equipment necessary for setting of granite
curb in accordance with relevant provisions of Section 609 of the NHDOT Standard
Specifications for Road and Bridge Construction, latest edition, and City of Nashua Standard
Specifications for Sidewalk Construction, latest edition. The most stringent specifications shall
apply unless otherwise directed by the Engineer.

Granite curb shall be set with concrete. Concrete shall extend from the top of the binder course
of pavement to below the bottom of the granite curb.

C. MEASUREMENT AND PAYMENT

Granite Curbing will be measured by the linear foot to the nearest 0.1 foot, from end to end along
the lower edge of the exposed face of the curbing and shall include all required excavation and
base course material.

Payment for Granite Curbing shall be at the contract unit price per linear foot, complete in place,

and shall include full compensation for material, labor, equipment, and all else needed to
complete the work under this item.

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