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ITEM 603.82212 — 12” POLYETHYLENE PIPE (TYPE S)

A.

SCOPE

This work shall consist of furnishing and installing polyethylene (PE) pipe type S, at the
locations shown on the plans or as ordered by the Engineer.

MATERIALS AND CONSTRUCTION

The Contractor shall furnish all materials, including the necessary joints, fittings, and
connections as required, labor and equipment necessary for the excavation, placement,
and joining of pipe in accordance with relevant provisions of Section 603 of the NHDOT
Standard Specifications for Road and Bridge Construction, latest edition. Sawed
pavement, common structure excavation to the depth specified in of Section 206.4.1 of
the NHDOT Standard Specifications for Road and Bridge Construction latest edition,
secondary excavation required in the imperfect trench method, bedding, shaping of
bedding, and backfill shall be included in this work.

MEASUREMENT AND PAYMENT

Pipe will be measured by the linear foot to the nearest foot. Measurement of circular pipe
will be made between the ends of the pipe along the central axis, including through
elbows and bends, as installed. No separate measurement will be made for elbows or
bends. Connection of the pipe to an existing drainage structure as directed by the
Engineer is incidental.

Page 14 of 43

ITEM 604.124 —- CATCH BASIN

A. SCOPE

This work includes furnishing and installing a catch basin at locations shown on the plans or as
directed by the Engineer.

B. MATERIALS AND CONSTRUCTION

The contractor shall furnish all materials, labor, equipment, and transportation necessary to
complete the work in accordance with the latest approved City of Nashua Standard
Specifications for Road Construction, or the latest approved NHDOT Standard Specifications for

Road and Bridge Construction. The most stringent specification shall apply unless otherwise
directed by the Engineer.

Except as noted below for leaching type catch basins, catch basins shall be Type B — 4’ diameter.

Where directed by the Engineer, catch basin shall be a leaching type catch basin installed in
compliance with attached detail.

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

under this item.

Leaching type catch basins shall be paid for at two hundred and fifty percent (250%) of the
contract unit price for Item 604.124.

Setting frame and grate shall be incidental.

Page 15 of 43

Technical Specifications — 2021 Paving Program Arterial and Collector Roadways

Leaching Catch Basin Detail

SINGLE GRATE - 24° x 24° OPENING
DOUBLE GRATE - 24" « 40" OPENING

TOP SLAB [H-20 LOADING)

SS

12"
THIN

PSS re FILTER FABRIC
L SSS (IRAP 1406 OF
APPROVED EQUAL)
CRUSHED STONE (COURSE)
NHOOT ITEM 04.6
PERFORATION (TYP)
10% BOTH WAYS

a:

'. (PERPORATED °

4 “
md
—

PERFORATION
NOT TO SCALE

oo

TW]

VARIES
(SEE PLANS)

- (PERFORATED) -.

NOTES:

1. BASE SHALL BE SOLID. SEDIMENT SHALL BE
REMOVED ON 4, REGULAR SCHEDULED BASIS
BY OWNER.

2. LOCATION OF DRAIN LINE OPENINGS VARY.
CORE TO JOB SPECIFICATIONS (SEE DRAIN
PROFILES).

3. STRUCTURE DESIGN AND REINFORCEMENT
SHALL CONFORM TO ASTM Ca? 6 ANID ATES.
CONCRETE SHALL BE 4000 FS] MINIMUM.

4. FILTER FABRIC MUST BE PLACED OVER
CRUSHED STONE AND OVERLAP EXISTING
RATERIAL BY 12° TO PREVENT PAVEMENT
BASE COURSE MATERIALS FROM MIGRATING
INT THE CRUSHED STONE,

LEACHING CATCH BASIN

MOT TO SCALE

“RISER SECTION -;. RISER SECTION S00

ot a!
yp bet
ne a ke

=i
4" MIM.

SUR" BABE oo

1z"|

a4" Gar Bia a" |
hm. MIN. |

Page 16 of 43

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.

Page 17 of 43

To:

From:

Re:

E. Motion:

Discussion:

City of Nashua, Public Works Division
Board of Public Works Meeting Date: May 25, 2022

Daniel Hudson, P.E., City Engineer
Engineering Department

Amendment | for Municipal Separated Storm Sewer System (MS4) Assistance

To approve Amendment | to the engineering services contract for tasks required
by the EPA MS4 Permit with Hazen and Sawyer, PC of Manchester, NH in an
amount of $40,427. Funding will be through Department: 169 Wastewater; Fund:
Wastewater; Activity: Stormwater Abatement.

The 2017 Municipal Separated Storm Sewer System (MS4) Permit, as issued by
the EPA, allows the City to discharge stormwater runoff to waterways in the City.
The EPA requires many documents to be generated, City properties to be
investigated, stormwater outfalls sampled and annual reporting provided as
examples of elements to be completed to comply with the City-wide permit.
Hazen and Sawyer, PC (Hazen) was hired in 2021 to assist the City in completing
these tasks, including the development of the Annual Report.

The City has at least 359 publicly-owned stormwater outfalls that are required to
be screened during dry weather, and should discharge be occurring, the flow is to
be sampled and tested in an effort to identity illicit discharges connected to the
storm drain system. During 2021, 260 outfalls were screened. This amendment is
to provide funding to complete the screening of the remaining outfalls. Additional
funding is also needed to provide the screening results and analysis in the Annual
Report which is due in September 2022.

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.

Page 18 of 43

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.

Page 19 of 43

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.

Page 20 of 43

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.

Page 21 of 43

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.

Page 22 of 43