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in full satisfaction of such hindrances and delays any extension of time that the City of Nashua may
provide.

11. INSURANCE Professional Engineer shall carry and maintain in effect during the performance of
services under this contract:

r General Liability insurance in the amount of $1,000,000 per occurrence; $2,000,000
aggregate;
* $1,000,000 Combined Single Limit Automobile Liability;
*Coverage must include all owned, non-owned and hired vehicles.
» $1,000,000 Profession Liability;
r and Workers’ Compensation Coverage in compliance with the State of New
Hampshire statutes, $100,000:$500,000/$ 100,000.

Professional Engineer shall maintain in effect at all times during the performance under this
contract all specified insurance coverage with insurers. None of the requirements as to types and
limits to be maintained by Professional Engineer are intended to and shall not in any manner limit
or qualify the liabilities and obligations assumed by Professional Engineer under this
contract. The City of Nashua shall not maintain any insurance on behalf of Professional Engineer.
Subcontractors are subject to the same insurance requirements as Professional Engineer and it shall
be the Professional Engineer’s responsibility to ensure compliance of this requirement.

Professional Engineer will provide the City of Nashua with certificates of insurance for coverage
as listed below and endorsements affecting coverage required by the contract within ten calendar
days after the City of Nashua issues the notice of award. The City of Nashua requires thirty days
written notice of cancellation or material change in coverage. The certificates and endorsements
for each insurance policy must be signed by a person authorized by the insurer and who is licensed
by the State of New Hampshire. General Liability and Auto Liability policies must name the
City of Nashua as an additional insured and reflect on the certificate of insurance. Professional
Engineer is responsible for filing updated certificates of insurance with the City of Nashua's Risk
Management Department during the life of the contract.

> All deductibles and self-insured retentions shall be fully disclosed in the certificate(s) of
insurance.

» If aggregate limits of less than $2,000,000 are imposed on bodily injury and
property damage, Professional Engineer must maintain umbrella liability insurance of at
least $1,000,000. All aggregates must be fully disclosed on the required certificate of

insurance,

> The specified insurance requirements do not relieve Professional Engineer of its
responsibilities or limit the amount of its liability to the City of Nashua or other
persons, and Professional Engineer is encouraged to purchase such additional

insurance, as it deems necessary.
» The insurance provided herein is primary, and no insurance held or owned by the City
of Nashua shall be called upon to contribute to a loss.
Professional Engineer is responsible for and required to remedy all damage or loss to any
property, including property of the City of Nashua, caused in whole or part by
Professional Engineer or anyone employed, directed, or supervised by Professional
Engineer.

Vv

12. INDEMNIFICATION Regardless of any coverage provided by any insurance, Professional Engineer
agrees to indemnify and hold harmless the City of Nashua, its agents, officials, employees and
authorized representatives and their employees from and against any and all suits, causes of action,
legal or administrative proceedings, arbitrations, claims, demands, damages, liabilities, interest.

GC 6 of Il

SECTION 02560

INTERFACE STRENGTH TESTING

PART 1 - GENERAL

1.01 SCOPE OF WORK

A.

The work in this Section includes all labor, materials, tools, and equipment
necessary to perform interface strength testing for the liner system components
using ASTM D5321 or D6243 for testing involving a Geosynthetic Clay Liner
(GCL).

Liner system interfaces to be testing include:
Drainage Sand/Drainage Geocomposite;
Drainage Geocomposite/Geomembrane;
Geomembrane/GCL;

GCL/Drainage Sand; and
Geomembrane/Screened Till.

lel ae

Interface shear testing shall be performed by an independent geosynthetic
testing laboratory and paid for by the Contractor.

1.02 QUALITY ASSURANCE

A.

The Materials Testing Laboratory performing the interface shear testing shall
be accredited by the Geosynthetics Accreditation Institute.

1.03 SUBMITTALS

A.

The Contractor shall submit to the CQA Consultant the results of the laboratory
tests for all the interfaces to be tested at least 10 days prior to beginning
geosynthetic installation.

PART 2 - PRODUCTS

PART 3 - EXECUTION

2.01 MATERIAL SAMPLING

A.

Materials to be tested shall be obtained in the presence of the CQA Consultant
or his designated representative from materials that will be placed during
construction. Sampling of geosynthetics may occur in the manufacturing
facility.

File No. 3066.09 Interface Strength Testing 02560 - Page 1 of 3 December 2017

B. The size of the geosynthetic sample to be obtained from each material type shall
be determined by the needs of the test to be performed, and be no small than a
3-foot long piece cut along the length of the geosynthetic roll.

C. Soil components used in the laboratory testing program shall be obtained from
the borrow source or from soil stockpiles to be utilized in the construction of
the soil components during construction.

2.02 INTERFACE STRENGTH TESTING REQUIREMENTS

A. The interface shear strength test results shall equal or exceed the peak and post-
peak strengths values listed in the table below.

Interface Shear Strength
Normal Stress Peak Post Peak
(psi) (psf) (psf)
22 854 448
44 1708 896
89 3416 1792

The following interfaces shall be tested in a soaked condition:

a. Drainage Geeocomposite/Geomembrane;

b. |Geomembrane/GCL; and

c. | Geomembrane Liner/Screened Till.

For the Geomembrane Liner/Screened Till interface, the Screened Till
shall be compacted to 95 percent of the maximum density as determined
by ASTM D698 at a water content one to two percent above the optimum.
The recompacted Screened Till shall be allowed to condition for no less
than 36 hours prior to testing.

For geosynthetic/soil interface tests (including those with GCL), the
geosynthetic shall be placed in the testing device first, and the soil
placed/compacted above. Care shall be take not to damage the underlying
geosynthetic.

The Geomembrane/GCL test setup shall be hydrated for 24 hours under a
normal stress of 5 psi. After soaking, the sample should be loaded to the at
least 10 psi and allowed to consolidate for 48 hours prior to testing.
Maximum shear displacement rates shall be as follows:

Drainage Sand/Drainage Geocomposite - 0.04 in./minute

Drainage Geocomposite/Geomembrane - 0.2 in./minute
Geomembrane/Geosynthetic Clay Liner (GCL) - 0.04 in./minute
GCL/Drainage Sand - 0.04 in./minute — 0.04 in./minute
Geomembrane/Screened Till - 0.04 in./minute.

eno gp

File No. 3066.09

Interface Strength Testing 02560 - Page 2 of 3 December 2017

2.03 REVIEW OF TEST RESULTS

A. The CQA Consultant shall review the interface strength testing reports to evaluate
whether the test results meet the minimum requirements of this specification.

B. The Contractor shall retest failed interfaces. Testing may be done at the same
laboratory or another independent laboratory. Retesting shall be performed at

the Contractor’s expense. Retest results shall be reviewed by the CQA Consultant
and/or Engineer.

[END OF SECTION 02560]

P:\3000s\3066.09\Source Files\Type II App\App C - Tech Specs\Division 2 Specifications\02560 Interface Testing.docx

File No. 3066.09 Interface Strength Testing 02560 - Page 3 of 3 December 2017

SECTION 02710

CULVERTS

PART 1 - GENERAL

1.1 SCOPE OF WORK

A. CONTRACTOR shall provide all labor, materials, tools, and equipment and
perform all operations necessary to furnish, install culverts, including
necessary joints and connections as required. Culverts shall consist of sections
of pipe of the kinds and sizes shown on the Drawings and as specified, laid on a
firm foundation in accordance with these Specifications.

1.2 SUBMITTALS

A. CONTRACTOR shall submit manufacturer’s technical product data and
installation instructions for culvert piping and appurtenances to ENGINEER in
advance of delivery of materials to the site.

1.3. PRODUCT DELIVERY, STORAGE, AND HANDLING

A. Inspection of Material

1. When delivered to the site and prior to unloading, CONTRACTOR shall
inspect all pipe and accessories for loss, damage, or lack of specified
identification and markings.

2. Any defective or improper material shall be immediately marked and
shall not be unloaded.

B. Storage
1. In shipping, storing, and installing, pipe shall be kept in a sound,

undamaged condition. It shall at all times be handled with care and shall
not be dropped, dumped, or bumped against any other object. Any
material(s) damaged shall be marked and immediately removed from the
job site.

C. Defective Materials

1.

Materials found at any time during the progress of the work to have
cracks, flaws, or other defects will be rejected and marked, and
CONTRACTOR shall promptly remove such defective material from the
work site.

File No. 3066.99

Culverts 02710 - 1 of 3 December 2017

PART 2 - PRODUCTS

2.1 PIPE AND FITTINGS

A.

Polyethylene (PE) Pipe

1. PEpipe shall conform to AASHTO M294.

2. Polyethylene flared end sections shall be fabricated by the same
manufacturer as the pipe, and shall be intended for use with the pipe
provided.

3. Split couplers shall be designed as soil-tight with a gasket.

Corrugated Polyethylene Pipe (CPP)

1. The culvert pipe shall be made of high density polyethylene material
conforming to the requirements of cell classification 435400C as defined
in ASTM D3350. The pipe shall have smooth inner walls.

2. HDPE End Sections: The method of fabrication and materials used shall
conform to the applicable requirements of AASHTO M294. The
connection of the end section to the pipe shall be made in accordance
with the manufacturer's recommendations.

3. Coupling bands shall be provided by the manufacturer of the pipe and
shall meet the soil-tight requirements of AASHTO M294.

Corrugated Metal Pipe (CMP)

1. Corrugated metal pipe shall be metallic coated (galvanized or
aluminized) corrugated metal pipe with locking corrugated bands. The
pipe shall conform to AASHTO M36.

2. The minimum thickness of the metal culvert sheets shall be 0.064 inches.

3. Pipe arch shall be of sufficient gauge for the size specified to support E80
live load with a minimum of 24 inches of soil cover.

4, Metal End Sections: Metal end sections shall be fabricated from
galvanized or aluminized steel. The connection of the metal end section
to the pipe shall be made in accordance with the manufacturer's
recommendations.

Reinforced Concrete Pipe (RCP) shall conform to Class IV in accordance with
ASTM C76.

PART 3 - EXECUTION

3.1 GENERAL

A.

Pipes and appurtenances shall be installed true to lines, grades, and locations
indicated on the Drawings. Any deviations must be approved by ENGINEER
before installation. CONTRACTOR shall furnish all labor, materials, and tools
to establish and maintain all lines and grades. Benchmarks and reference
points as required for control of the work are shown on the Drawings or will
be provided to CONTRACTOR.

File No. 3066.99 Culverts 02710 - 2 of 3 December 2017

3.2

3.3

3.4

BACKFILL AND COMPACTION

A.

Backfill and compaction shall be as specified in Section 02200.

PIPE BEDDING CONDITIONS

A.

Pipe laid in open trench excavations shall be bedded in and uniformly
supported over their full length on compacted Drainage Sand.

INSTALLATION OF PIPE AND FITTINGS

A.

After the trench bedding has been brought to the proper grade the pipe shall
be laid. Pipe installation shall be done only in the presence of ENGINEER, and
the CONTRACTOR shall give ample notice of schedule of pipe laying operations
to ENGINEER.

All pipe and fittings shall be carefully lowered into the trench by hand or with
appropriate equipment. Pipe becoming cracked or otherwise damaged during
or following installation shall be marked by CONTRACTOR or ENGINEER and
removed from the site.

Pipes shall be laid true to grades shown on the Drawings or as directed by
Engineer. Each section of pipe shall rest upon the pipe bed for the full length of
its barrel, with recesses excavated to accommodate joints. Blocking will not be
permitted. Any pipe that has its grade or joints disturbed after being laid shall
be taken up and re-laid.

The pipe ends shall be thoroughly cleaned before the joint is made. All
connections shall be made in accordance with instructions supplied by the
manufacturer.

[END OF SECTION 02710]

P:\3000s\3066.09\Source Files\Type II App\Specifications\ Division 2 Specifications\02710 Culverts.docx

File No. 3066.99 Culverts 02710 - 3 of 3 December 2017

SECTION 02830

TOPSOIL, HYDROSEEDING, AND TURF ESTABLISHMENT

PART 1 - GENERAL

1.1 SCOPE OF WORK

A.

Furnish all labor, materials, equipment and incidentals required to place
topsoil, finish grade, furnish and apply lime and fertilizer, furnish and
hydraulically apply seed and mulch, and maintain all seeded areas as specified
herein. Topsoil will be available for use by the CONTRACTOR on-site.
CONTRACTOR shall load and haul topsoil to the project area.

CONTRACTOR shall seed all areas disturbed by his operations. All areas
disturbed or not having sufficient vegetation to prevent erosion shall be
seeded.

Topsoil, Hydrooseeding, and turf establishment shall comply with the
requirements within the Alteration of Terrain Permit.

1.2 SUBMITTALS

A.

CONTRACTOR shall submit the proposed seed mix including the
manufacturer's certificate of compliance to ENGINEER for review prior to
seeding.

1.3. SAMPLES AND APPROVAL OF MATERIAL

A.

B.

Samples of all materials shall be submitted for inspection and acceptance upon
ENGINEER's request.

Seed bag tags shall be provided to the ENGINEER at the time of seeding.

PART 2 - PRODUCTS

2.1 MATERIALS

A.

Fertilizer and loam shall be commercial grade that is consistent with the State
Cooperative Extension’s recommendations for establishing a healthy
vegetative cover as described herein. It shall be delivered to the Site in the
original unopened containers, each showing the manufacturer’s guaranteed
analysis. Fertilizer shall be stored so that when used it shall be dry and free-
flowing.

Seed shall be as specified on the Drawings
The seed shall be furnished and delivered premixed in the specified

proportions. The manufacturer for each seed type shall provide a
manufacturer’s certificate of compliance to the specified mix. These

File No. 3066.096 Topsoil, Hydroseeding, and Turf Establishment 02830 - 1 of 4 December 2017

certificates shall include the guaranteed percentages of purity, weed content,
and germination of the seed, and also the net weight and date of shipment. No
seed may be sown until CONTRACTOR has submitted the certificates to
ENGINEER.

Mulch shall be specially processed cellulose fiber containing no growth or
germination inhibiting factors. It shall be manufactured in such a manner that
after agitation in slurry tanks with water, the fibers in the material become
uniformly suspended to form a homogenous slurry. When sprayed on the
ground, the material shall allow absorption and percolation of moisture.

Fertilizer, seed, and lime shall be furnished in new, clean, sealed, and properly
labeled bags, with the following information clearly marked:

1. Manufacturer name

2. Type

3. Weight

4. Guaranteed analysis

PART 3 - EXECUTION

3.1 APPLICATION

A.

D.

Unless otherwise shown on the Drawings, topsoil shall be placed to a minimum
thickness of 4 inches.

For all areas to be seeded:

1. Lime and fertilizer shall be applied uniformly over the area at the rate
noted on the Drawings. Modifications to the application rate and/or
fertilizer type may be made based on recommendations from the State
Cooperative Extension based on topsoil testing.

2. Seed shall be applied uniformly over the area at the rate noted on the
Drawings.

The application of fertilizer and lime shall be performed hydraulically in one
operation with hydroseeding. CONTRACTOR will be responsible for cleaning
all structures and paved areas of unwanted deposits.

The application of mulch is to be by pneumatic blower.

3.2 INSTALLATION

A.

The subgrade of all areas to be covered with topsoil and seeded shall be raked
and all rubbish, sticks, roots and stones larger than 3 inches shall be removed.
Subgrade surfaces in all areas shall be tracked immediately after fine grading
and raking has been completed. Tracking is to be performed with bulldozers
operating in the direction of water flow. The tracks of the bulldozers are to
have grousers of sufficient height to leave visible depressions in the subgrade.
The depressions are to be perpendicular to the direction of water flow to
reduce erosion potential until topsoil is placed. During the tracking, all
depressions caused by settlement or tracking shall be filled with additional

File No. 3066.096 Topsoil, Hydroseeding, and Turf Establishment 02830 - 2 of 4 December 2017

topsoil and the surface shall be regraded and tracked until an even finished
grade is created.

B. Subgrades shall be observed and approved by ENGINEER before topsoil is
placed. After topsoil has been spread and fine graded, all large stiff clods,
lumps, brush, roots, stumps, litter and other foreign material shall be removed
from the area covered with topsoil and disposed of by CONTRACTOR. The
entire area where topsoil has been placed shall then be tracked as indicated in
paragraph 3.2.A above.

C. Application of fertilizer, lime, seed and mulch shall only be performed during
those periods within the seasons that are normal for such work as determined
by the weather and locally accepted practice, and as approved by ENGINEER.
CONTRACTOR shall hydroseed and hay mulch only on a calm day.

D. Contractor shall schedule seeding and fertilizing activities with ENGINEER and
OWNER.

E. Lime and fertilizer are to be spread hydraulically in one operation with the
hydroseeding.

F. Seed shall be sown within five (5) days following soil preparation, unless
otherwise approved by ENGINEER or OWNER. Seed shall be applied
hydraulically at the rates and percentages indicated. The spraying equipment
and mixture shall be designed so that when the mixture is sprayed over an
area, the lime, fertilizer, and seed shall be equal in quantity to the specified
rates. Prior to the start of Work, CONTRACTOR shall provide ENGINEER and
OWNER with a certified statement for approval as to the number of pounds of
materials to be used per 100 gallons of water. This statement shall also specify
the number of square feet of seeding that can be covered with the quantity of
solution in the hydroseeder.

G. Hay or straw mulch shall be tracked as described in Paragraph 3.2.A.

H. When protection of newly graded areas is necessary at a time outside of the
normal seeding season, CONTRACTOR shall protect those areas by whatever
means necessary (such as straw) or by other measures as approved by
ENGINEER and OWNER.

3.3. MAINTENANCE AND PROVISIONAL ACCEPTANCE

A. CONTRACTOR shall keep all seeded areas watered and in good condition, shall
reseed if and when necessary until a good, healthy, uniform growth is
established over the entire area seeded, and shall maintain these areas in an
approved condition until provisional acceptance.

B. On slopes, CONTRACTOR shall protect against wash outs by an approved
method. Any wash out that occurs shall be regraded and reseeded at
CONTRACTOR's expense until a good sod cover is established.

File No. 3066.096 Topsoil, Hydroseeding, and Turf Establishment 02830 - 3 of 4 December 2017