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American Society for Testing and Materials (ASTM):

ASTM D1557 _ Test for Moisture-Density Relations of Soils and Soil-Aggregate Mixtures
Using 10 Pound Rammer and 18-Inch Drop

State of New Hampshire Department of Transportation (NHDOT) Standard Specifications for
Road and Bridge Construction, latest edition:

Section 304 Gravel Base Course

Section 306 Reclaimed Stabilized Base

Section 401 Plant Mix Pavements - Table 401-1 and 401-2
Section 609 Curbs

Prime and Tack Coats - shall conform to the NHDOT Standards

Federal Specifications:
SS-S-164 Sealing Compound, Hot Poured Type, for Joints in Concrete
SS-S-1401C Sealants, Joint, Non-Jet-Fuel-Resistant, Hot Applied, for Portland

Cement and Asphalt Concrete Pavement

1.05 = SUBMITTALS: INACCORDANCE WITH REQUIREMENTS OF GENERAL
SPECIFICATIONS, SUBMIT THE FOLLOWING:

A. _ Six sets of complete job mix formula shall be submitted to the Engineer at least two weeks
before any of the work of this section is to begin.

B. Delivery slips shall be furnished with each load of mix delivered to the project.
Information shall include:

Vehicle identification.

Date.

Project.

Identification of material.

Gross, tare and net weights.

Signed by the bituminous concrete producer.

Stamped by a licensed public weighmaster.

Crushed Gravel and Curbing submittals as required by the NHDOT
specifications.

ANAM YWND

2019 Sewer Replacement Project Road Restoration
Nashua, NH 02745-2

PART2-PRODUCTS

2.01 CRUSHED GRAVEL SUBBASE:
A. — Crushed gravel subbase shall conform to NHDOT Item 304.3 Crushed Gravel, or Item 304.4
Crushed Stone (Fine gradation).
2.02 CURBING:
A. Curbing shall conform to NHDOT Item 609.01 Straight Granite Curb.
2.03 RECLAIMED STABILIZED:
A. Reclaimed stabilized base shall conform to NHDOT Item 304.112, Reclaimed Stabilized
Base Processed in Place, 12” Deep.
2.02 SIDEWALKS:

A. Bituminous sidewalks shall conform to NHDOT Item 608.12, 2-Inch Bituminous Sidewalk.

B. Concrete sidewalk shall conform to NHDOT Item 608.24, 4-Inch Concrete Sidewalk.

C. Detectable warning panels for sidewalk curb ramps shall be as manufactured by ADA Solutions,
Inc, or approved equal, and shall be “BRICK RED” in color. The color shall be approved by the
Engineer.

2.03 BITUMINOUS CONCRETE PAVEMENT:

A. The type of bituminous pavement courses to be utilized on this project shall be:
Roadway Pavement Section
Layer Description Thickness (inches)

Temporary Pavement (Single Course)
NHDOT 12.5mm Superpave 3”
(50 Gyration Design)
Permanent Wearing Course
NHDOT 9.5 mm Superpave 1-1/2”
(75 Gyration Design)
Permanent Binder Courses
NHDOT 19 mm Superpave 2-1/2”
(50 Gyration Design)

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Nashua, NH 02745-3

B. The joint sealant shall be a hot poured rubberized emulsified asphalt sealant meeting the
requirements of Federal Specifications SS-S-1401 or SS-S-164.

2.03 TACK COAT:
A. The tack coat shall be an asphalt emulsion, RS-1.

B. The Tack Coat shall be applied to all vertical seams and joints, and between the
bituminous binder and wearing course layers.

C. The surface to which the Tack Coat will be applied shall be prepared as detailed in
the NHDOT, Standard Specifications 410.3.3.2.

D. The Tack Coat shall be applied as detailed in the NHDOT Standard Specifications
410.3.4.2

E. The Tack Coat shall be applied at a rate as detailed in the NHDOT Standard
Specifications 410.3.4.2.1, and as approved by the Engineer.

F, The Tack Coat shall be considered subsidiary to the wearing course of pavement.

PART3 EXECUTION
3.01 GENERAL:

A. _ Paving courses required for the project shall be as shown on the drawings and as specified
herein. Pavement thicknesses specified are measured in compacted inches. If a pavement course
thickness exceeds 2-1/2 compacted inches, the course shall be installed in multiple lifts with each
lift not exceeding 2-1/2 compacted inches in thickness.

3.02 GRAVEL SUBBASE:

A. _ The crushed gravel subbase to be placed under temporary pavement and elsewhere as required
shall consist of the specified thickness of crushed gravel evenly spread and thoroughly
compacted.

B. _ The gravel shall be spread in layers not more than 6-inches thick, compacted measure. All layers
shall be compacted to not less than 95 percent of the maximum dry density of the material as
determined by ASTM D1557 Method C at optimum moisture content.

3.03 TEMPORARY BITUMINOUS PAVEMENT:

A. — Where specified and directed by the Engineer and after placement of the Crushed Gravel sub-
base, the Contractor shall place temporary bituminous pavement above the trench, between the
edges of the existing pavement. It shall consist of a single course of Hot Bituminous Pavement
mix, of the thickness specified on the plans, in accordance with NHDOT Standard Specifications
Section 401.

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B. The temporary pavement shall be repaired as necessary to maintain the surface of the
pavement until replaced by permanent pavement.

3.04 RECLAIMED STABILIZED BASE:

A. Reclaimed stabilized base shall consist of pulverizing the existing pavement together with
subbase material to the depth specified on the plans, removal and disposal of
excess reclaim material at the City landfill, fine grading to assure that finished surface
matches existing gutter or as directed by the Engineer, and compaction of materials
to required densities. The material removed from this operation shall remain the
property of the City of Nashua and shall be transported and stock piled by the
contractor at the Four Hills Landfill at 830 West Hollis St in Nashua.

B. Compaction shall be accomplished using a vibratory sheep's foot roller or pad foot
roller with at least 50,000 Ibs. of dynamic force. Final rolling shall be
accomplished by a smooth steel wheel vibratory roller with at least 27,000 lbs. of
dynamic force. Contractor shall also provide compaction equipment sufficient to
achieve required densities in areas not accessible by larger equipment.

C. Fine grading to proposed grades shallbe subsidiary. Removal, transportation, and
disposal of approximately 4" of material are subsidiary. After the roadway has been
fine graded and compacted, the Contractor will allow 1 working day for the city to
review compacted base. In no case shall paving be scheduled prior to acceptance of

base proposed grades.

D. All catch basins must be protected from reclaimed materials by use of silt sacks.

All materials, labor, equipment, and transportation necessary to install, maintain,
and remove the silt sacks shall be subsidiary, including disposal of material.

E. The Contractor shall be responsible to assure that the finished pavement surface
will be smooth and will have positive drainage. Contractor shall be responsible to
assure that puddling will not occur in either the roadway, nor on adjacent private
property as a result of Contractor operations. Contractor shall perform any
measurements needed in advance of excavation, cold planing or reclamation
activities to assure adequate control needed for grading operations.

F. ‘The Engineer may provide a proposed grading design to the Contractor for use in
areas to be reclaimed. Ifa proposed design or other guidance is not provided by the
Engineer, the Contractor shall perform grading of the reclaimed base material to
assure that the preconstruction gutter line is recreated. Unless otherwise directed,
roadway cross slope on reclaimed streets shall generally be two percent with a
centerline crown. In all cases roadway cross slopes on reclaimed streets shall not
exceed four percent. Pavement cross slope transitions shall be consistent with good
practice generally accepted by New Hampshire Department of Transportation. If in
the opinion of the Contractor it is not possible to meet these grading requirements at a
particular location due to existing constraints, any such location shall be identified
to the Engineer in advance of scheduled activities to allow the Engineer reasonable
time to investigate and provide guidance to the Contractor.

2019 Sewer Replacement Project Road Restoration
Nashua, NH 02745-5

3.05 © PERMANENT BITUMINOUS PAVEMENT:

A. The bituminous paving mixture, equipment, methods of mixing and placing, and the
precautions to be observed as to weather, condition of base, etc., shall be in accordance with
NHDOT Standard Specifications Section 401.

B. BASE COURSE AND BINDER COURSE PAVEMENT:

1.

Immediately prior to installing the base and/or binder course, the trimmed edges shall be
made stable and unyielding, free of loose or broken pieces and all edges shall be
thoroughly broomed clean. Contact surfaces of trench sides, curbings, manholes, catch
basins, or other appurtenant structures in the pavement shall be painted thoroughly
with a uniform coating of asphalt emulsion (tack coat), just before any mixture is placed
against them.

The binder course shall be repaired as necessary to maintain the surface of the
pavement until placement of the permanent overlay. If required, the Contractor shall place
a leveling course before placing the permanent overlay.

C. TOP COURSE OR SURFACE TREATMENT PAVEMENT (PERMANENT OVERLAY):

1.

Top course or surface treatment shall be placed over the full width as shown on the
drawings or as specified.

Prior to placement of the top course or surface treatment, the entire surface over
which the top course or surface treatment is to be placed shall be broom cleaned and tack
coated.

Top course or surface treatment pavement placed over trenches may be feathered to meet
existing paved surfaces, if approved by the Engineer.

Prior to placing full width top course or surface treatment pavements, keyways shall be cut
in all intersecting streets.

3.06 PAVEMENT PLACEMENT:

A. Unless otherwise permitted by the Engineer for particular conditions, only machine
methods of placing the pavement shall be used. The equipment for spreading and finishing shall
be mechanical, self-powered pavers, capable of spreading and finishing the mixture true to line,
grade, width and crown. The mixtures shall be placed and compacted only at such times as to
permit proper inspection and checking by the Engineer.

B. After the paving mixtures have been properly spread, initial and intermediate compaction shall
be obtained by the use of steel wheel rollers having a weight of not less than 240 pounds per

inch width of tread.
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C. Final rolling of the top course or surface treatment pavement shall be performed by a steel
wheel roller weighing not less than 285 pounds per inch width of tread at a mix
temperature and time sufficient to allow for final smoothing of the surface and thorough
compaction.

D. Immediately after placement of top course or surface treatment pavement, all joints
between the existing and new top course or surface treatment pavements shall be sealed with
hot poured rubberized asphalt sealant meeting the requirements of Federal Specification
SS-S-1401 or SS-S-164.

E. Where there is no backing for the edges of the curb-to-curb pavement, the Contractor shall
provide a gravel transition. The gravel transition shall be installed immediately after the
pavement is placed, shall be feathered and extend a minimum of 18 inches, and shall be
compacted using the same equipment as for pavement compaction. The gravel shall be
uniformly graded material with a maximum size of 3/8 to 1/2 inch.

F. When directed by the Engineer, the Contractor shall furnish and install additional paving to
provide satisfactory transition for driveways and walkways impacted by a new curb-to-curb
pavement installation. The transition installation will be considered incidental to the curb-
to-curb pavement installation.

3.07 RAISING AND ADJUSTING CASTINGS:

A. In areas of permanent top course paving, existing municipally-owned catch basin and
manhole castings and valve boxes shall be raised to the proper grade where directed by the
Engineer.

B. Castings owned by private utilities shall be raised by their own forces. The Contractor shall
be responsible for coordinating this work.

C. The method of adjusting these castings shall be as follows: Cut around catch basin or
manhole castings a minimum of 8-inches from casting. Excavate and if required rebuild up to 18-
inches of masonry below the bottom of the casting. Backfill with suitable material and
compact to bottom of casting. Place high, early strength cement or bituminous concrete
collar, as directed, to approximately 1 1/2-inches below the raised casting grade. Masonry work
shall conform to Section 02631, PRECAST MANHOLES AND CATCH BASINS.

D. _ In some areas, raising of castings may not be required. Where directed by the Engineer,
castings not to be raised shall have at least 12-inches of bituminous concrete pavement
chipped and removed around the casting. New bituminous concrete pavement shall be placed
and compacted around such castings to approximately 1-1/2-inches below the top of the casting.
The overlay course shall then be sloped down to the level of the casting.

E. The method of raising valve boxes shall be as follows: Cut around valve box a minimum of 8-
inches from valve box. Excavate as required and raise the valve box. Pour high early strength
cement or bituminous concrete collar, as directed, to approximately 1-1/2-inches below the top
of the valve box.

2019 Sewer Replacement Project Road Restoration
Nashua, NH 02745-7

F,

3.08

3.09

3.10

3.10

A.

Castings which need to be raised or adjusted to complete permanent curb to curb paving shall
be done immediately prior to paving.

PAVEMENT MARKINGS:

The Contractor shall replace all pavement markings removed or covered-over in carrying out the
work, and as directed by the Engineer, no sooner than 48 hours after completion of permanent
pavement. The markings and respective mixture and application requirements shall conform to
the requirements of NHDOT Standard Specifications Section 632.

PAVEMENT REPAIR:

If permanent pavement becomes rough or uneven, permanent pavement patches and trenches
shall be repaired and brought to grade utilizing "infrared" paving methods following completion
of the construction. The Contractor performing the work shall use care to avoid overheating
the pavement being repaired. Pavement repair shall extend a minimum of 6-inches beyond all
edges of the pavement patch to assure adequate bonding at the pavement joints.

SIDEWALKS:

Bituminous and concrete sidewalks shall be installed in strict conformance with the
construction requirements of the NHDOT Section 608 — Sidewalks.

Sidewalk curb ramps shall be installed in strict conformance to the NHDOT Standard Plans
for Road Construction, Sidewalk Curb Ramp Details (9 Sheets). The detectable warning
panels shall be installed in wet concrete pavement as recommended by the manufacturer. The

sidewalk panel containing the detectable warning panel shall be reinforced with wire mesh and
thickened to 6-inch depth.

CURBS:

Curbing shall be installed in strict conformance with the construction requirements of the
NHDOT Section 609 — Curbs.

END OF SECTION

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Nashua, NH 02745-8

SECTION 02920
LOAMING AND SEEDING
PART 1 - GENERAL
1.01 DESCRIPTION OF WORK:

A. This section covers all labor, materials, and equipment necessary to do all loaming,
seeding and related work for miscellaneous areas disturbed by roadway and sidewalk
construction and as herein specified.

Note: Loaming and seeding for miscellaneous areas disturbed by roadway and
sidewalk construction is subsidiary to the sidewalk items of work.

1.02 RELATED WORK:
A. Section 02300 - EARTHWORK
B. Section 02370 - EROSION CONTROL

PART 2 —- PRODUCTS
2.01 MATERIALS:

A. Loam for disturbed areas shall comply with the following
requirements.

-Topsoil for use in general lawn areas and planting beds shall
conform to the following grain size distribution for material
passing the #10 sieve:

U.S. Sieve No. % Passing by Weight
Minimum Maximum
10 100 a=
20 78 100
40 60 85
100 38 60
270 22 35
0.002 mm 2 5

Natural loam not conforming to above shall be treated by the Contractor to
meet this specification. Cost of amendment to the loam shall be the
Contractor's responsibility.

B. Fertilizer:

1. Fertilizer shall be commercial fertilizer, 10-10-10 fertilizer mixture containing
at least 40 percent of organic nitrogen.
C. Mulch:
1. Materials to be used in mulching shall be hay, straw or wood fiber mulch.
2019 Sewer Replacement Project Loam and Seed

Nashua, NH 02920-1

D. Lawn Seed:

1. Grass Seed: Provide fresh, clean, new-crop seed complying with tolerance for
purity and germination established by Official Seed Analysis of North America.
Provide seed mixture composed of grass species, proportions with maximum
percentages of purity and germination, and a minimum percentage of weed
seed, as specified.

¢ 45% Turf Type Tall Fescue

¢ 20% Kentucky Bluegrass

¢ 20% Creeping Red Fescue

¢ 15% Perennial Ryegrass

Sow at rate of 6-7 Ibs. per 1000 square feet.

Recommended planting dates: 4/1 - 5/31 or 8/15 - 10/15
PART 3 — EXECUTION
3.01 SURFACE PREPARATION:

A. After approval of rough grading, loam shall be placed on areas affected by the
Contractor's operations. Loam shall be at least 6 inches compacted thickness.

B. Fertilizer shall be applied at the rate of 1000 pounds per acre.

C. Loam shall be worked a minimum of 3 inches deep, thoroughly incorporating the lime
and fertilizer into the soil. The loam shall then be raked until the surface is finely
pulverized and smooth and lightly compacted with rollers. Minimum depth shall be 4-
inches after completion.

3.02 PLACING LOAM

A. Site:
1. All subgrade elevations should be uniformly graded to receive loam and shall
be inspected and approved by the Engineer prior to placement of loam.
2. Place loam to form a total depth of 4", unless noted otherwise, when rolled.
3. All depressions exposed during the rolling shall be filled with additional loam.

3.03 SEEDING AND MULCHING:

A. Seeding shall be done when weather conditions are approved as suitable, in the periods
between April 1 and May 30 or August 15 to October 1, unless otherwise approved.

B. The Contractor shall maintain all seeded areas until final acceptance of the contract.

END OF SECTION

2019 Sewer Replacement Project Loam and Seed
Nashua, NH 02920-2

THE CITY OF NASHUA “The Cate City"

Financial Services

Purchasing Department

February 28, 2079
Memo #19-127

TO: MAYOR DONCHESS
FINANCE COMMITTEE

SUBJECT: PAVEMENT MANAGEMENT ENGINEERING SERVICES (VALUE: $462,435)
DEPARTMENT: 169 WASTEWATER; FUND: BOND

Please see the attached communication from Stephen Dookran, P.E., City Engineer, dated February 28,
2019 for information related to this purchase.

Pursuant to § 5-78 Major purchases (greater than $10,000) A. All supplies and contractual services,
except as otherwise provided herein, when the estimated cost thereof shall exceed $10,000 shall be
purchased by formal, written contract from the lowest responsible bidder, after due notice inviting bids.

The City Engineer, Board of Public Works (February 28, 2019 meeting) and the Purchasing Department
recommend the award of this contract in an amount of $462,435 to Hayner/Swanson, Inc. of Nashua,
NH.

Respectfully, “
fi. ef x

f

\ j an Kooken
Purchasing Manager

Cc: S Dookran L Fauteux

229 Main Street » Nashua, New Hampshire 03061 ¢ Phone (603) 589-3330 e Fax (603) 589-3233 |