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3.03

Active leaks shall be stopped with chemical or hydraulic sealants or cements prior to
installation.

All aveas to be sealed shall be dry, clean, and free of dust, dirt, sand, and othe
contaminants prior to installation. A torch may be required to ensure a dry surface.

Chimney seal shall be installed in strict accordance with the manufacturer’ s installation
instructions over the entire chimney area and onto the frane and cone as shown on the
Rehabilitation of Existing Manhole detail on Drawing DO2. A primer shall be used if
recommended by the manufacturer.

CHEMICAL GROUT (EHERE APPLICABLE):

Install chemical grout in accordance with Section 02760 — Structural Grouting.

Chemical grouting shall be completed and accepted prior to performing internal lining if
both methods are specified or directed by the Owner and/or Engineer for a specific
menhole.

INTERNAL LINER SYSTEM:

All loose and protruding mortar, bricks, roots, aid anything else that might prevent proper
application of the liner shall be removed prior to application. Manhole steps, protruding
pipes, and exposed rebar shall be renoved and ground back 1/2 inch into the manhole
wall. Manhole steos and protruding pipe shall not be replaced after installation of the
liner.

High pressure water shall be used during surface preparation to produce a clean, abraded,
and sound surface with no evidence of laitance, loose material, or other contaminants.
Surface shall have a suitable profile for application of liner in accordance with the
manufacturer’ s requirements.

Active leaks shall be stopped with chemical or hydraulic sealants or cements prior to
installation.

All areas to be lined shall be dry, clean, and free of dust, dirt, sand, and othe
contaminants prior to installation. A torch or heat lanp may be required to ensure a dry
surface.

Any spray equipment used for application shall be specifically designed to accurately
ratio and apply the liner system. Liner system shall be installed in strict accordance with
the manufacturer’ s installation instructions over the entire interior of the manhole and 2
inches up onto the frane and 6 inches down onto the bench as shown on the
Rehabilitation of Existing Manhole detail on Drawing DQ2.

Multilayered polyurethane/polymeric stress skin panel system shall be installed in strict
accordance with the manufacturer's installation instructions, including those for

02800-6

3.05

materials handling, mixing, environmental controls, working time, working temperature,
pot life, allowable time between coats (recoat time), safety, and spray equipment. A
permanent identification and date of work performed shall be affixed to the structure in a
readily-visible location, and a final written report shall be provided to Owner and
Engineer detailing the location, date of report, and description of liner installation.

Epoxy or polyurethane coating shall be installed in strict accordance with the
manufacturer’ s installation instructions, including those for materials handling, primers,
mixing, environmental controls, working time, working temperature, pot life, allowable
time between coats (recoat time), safety, and soray equipment. Installation of epoxy or
polyurethane coating over cementitious base coat shall not occur until the cementitious
base coat has cured to the extent and time required by the manufacturer. A permanent
identification and date of work performed shall be affixed to the structure in a readily-
visible location, and a final written report shall be provided to Owner and Engineer
detailing the location, date of report, and description of liner installation.

Cementitious base coat shall be installed in strict accordance with the manufacturer’s
installation instructions, including those for materias handling, on-site mixing,
e€nvironmenta controls, working time, working temperature, safety, and soray equipment.
Water shal only be added to the materials during the mixing process and prior to materia
pumping or soray application; water shall not be added a& the nozzle Cementitious base
coat shall only be installed via low-pressure application. The cured base coat surface shall
be trowded smooth and continuous with proper sealing connections to all unsurfaced areas.
The total thickness of the cementitious base coat shall be in accordance with the eooxy or
polyurethane lining menufacture’'s recommendations and the following minimum
requirements:

1. For all brick manholes and for block or cast concrete manholes in poor
condition with notable loss of surface material or exposed reinforcing, apply to a
minimum thickness of 1 inch.

2. For block or cast concrete manholes in fair condition, aoply to a minimum
thickness of 0.5 inch.

3. For block or cast concrete manholes in good condition with no loss of
surface material, it may be acceptable to aoply the epoxy or polyurethane top coat
directly to the manhole surface without applying a cementitious base coat if the
Contractor confirms that the existing manhole surface meets the requirements of
the epoxy or polyurethane top coat manufacturer.

BENCH, CHANNEL, AND INVERT:

Flow channels shall conform in shape and slope to that of the existing sewers entering and
exiting the manholes.

Invert shall be smooth, shall be semi-circular in cross-section, and shal have the sane
diameter as the existing pipe exiting the manhole.

02800-7

3.07

Changes in direction of flow or sewer centerline within a manhole shall be made by
forming the flow channel along a smooth curve with as long of a radius as the inside of
the manhole will allow.

Bench shall slope toward invert as shown on the Rehabilitation of Existing Manhole detal|
on Drawing DO2 for proper drainage to the invert channel.

Benches shall be built up to a height as shown on the Rehabilitation of Existing Manhole

detail on Drawing DO2 for the entering and exiting pipes and shall be given a uniform
wood float finish.

Where possible, anon-shrink grout fillet shall be installed around pipe penetrations above
the bench.

DROP BOWL ASSEMBLY:

Drop pipe and bowl shall be connected to the pipe(s) enteing a manhole using
manufactured couplings or fittings.

Schedule 40 PVC pipe shall be connected using industry-grade solvent cement.

Drop pipe shall be secured to the inside of manhole using steel straps or struts. Straos
shall have aminimum width of 1/2 inch and a minimum thickness of 0.03 inch.

Tee and bottom elbow shall be firmly secured by straos. Intermediate straps shall be
spaced at aminimum of 5 feet. Straps shall be esoxy-anchored to manhole using 1/4-inch
anchors (two per strap). Anchor shall be enbedded into mortar a minimum of 3 inches.
Bottom elbow shall be seated on bench for support.

If amanufactured drop bow! product is used, drop assembly shall be sized and installed in
strict accordance with the manufacturer’ s installation instructions and guidelines.

INSPECTION, TESTING, AND ACCEPTANCE:

Contractor shall have appropriate equipment and OSHA training to dlow the Owner
and/or Engineer to enter and inspect the manholes during rehabilitation. If any defects are
observed, products shall be repaired or reolaced at no cost to the Owner using a method
acceptable to the manufacturer aid Owner and/or Engineer.

Vacuum testing in accordance with ASTM C1244 shall be required on one randomly-
selected manhole for each group of five manholes rehabilitated with internal liners.
Contractor shall perform vacuum testing with appropriate test equipment in the presence
of an inspector. Any manholes failing this test shall be reworked as necessary and
retested at no additional cost to the Owner. All verification and vacuum testing shall be at
no cost to the Owner and shall be paid for by the manufacturer or the Contractor.

Holiday detection testing in accordance with ASTM D4787 shall be required on one
randomly-selected manhole for each group of five manholes rehabilitated with internal

02800-8

chimney seals or liners. Contractor shall perform holiday detection testing in the presence
of an inspector with test equipment appropriate for the product. All detected holidays
shall be marked and repaired by abrading the coating surface with grit disk paper or
another hand-tooling method. After aorading and cleaning, additional coating shall be
hand-aoplied to the repair area as needed. All touch-up/reoair procedures shall be in
accordance with the coating manufacturer's recommendations. All verification and
holiday detection testing shall be at no cost to the Owner and shall be paid for by the
menufacturer or the Contractor.

Adhesion (Pull-off) testing shall be required on one randomly-selected chimney seal for
each group of ten manholes rehabilitated with internal chimney seals or liners. A portable
pull-off adhesion tester shall be used to achieve substrate failure. Any chimney seals or
liners failing this test shall be reworked as necessary and retested at no additional cost to
the Owner.

Chimney seals shall be accepted by the Owner and Engineer after they pass holiday
detection testing, adhesion testing, and a visual inspection for voids, pinholes, and
leakage.

Internal liners shall be accepted by the Owner and Engineer after they pass vacuum
testing, holiday detection testing, adhesion testing, and a visual manned entry inspection
for voids, pinholes, cracks, leakage, and ay other defect.

Drop bow! assemblies, and reconstructed channels, inverts, and benches shall be accepted

by the Owner and Engineer after they pass a visual manned entry inspection for voids,
pinholes, cracks, leakage, and any other defect.

END OF SECTION

02800-9

SECTION 02930

DETECTABLE WARNING AT HANDICAP RAMP

SCOPE

A curb ramp shall have a detectable warning. The detectable warning shall extend the full
width of the curb ramp (exclusive of flared sides) and shall extend either the full depth of
the curb ramp or 24 inches (610 mm) deep minimum measured from the back of the curb
on the ramp surface.

MATERIALS AND CONSTRUCTION

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 contrast visually with adjacent walking surfaces either light-on-
dark, or dark-on-light.

1,6-2.4
41-61 '
top diameter of 0.65 min —— 1.6-2.4
50% Got of the base diameter \, 02 SS NO OF O- OD) art
base diameter of . ‘ eq iO O Os-o
0.9-1.4 (23-36 mimi aE
oo 68 66
(a)
elevation ib)
(enlarged) plan

Figure 705.1 Size and Spacing of Truncated Domes

END OF SECTION

02930-1

NOTICE TO PROCEED

DATED:

TO:

(Contractor)

ADDRESS:

OWNER’S CONTRACT NO.

PROJECT:

(Insert name of Contract as it appears in the Bidding Document)

You are notified that the Contract Times under the above contract will commence to run on
20 . By that date, you are to start performing your obligations under the
Contract Documents. In accordance with Article 4 of the Agreement, the dates of Substantial
Completion and Final Completion are and
respectively.

Also before you may start any Work at the site you must:

(Add other requirements)

By

(For the City of Nashua)

(Title)

lof l
Notice to Proceed

CHANGE ORDER

PROJECT:

OWNER’S CONTRACT NO:

EXECUTED CONTRACT DATE:

DATE OF ISSUANCE:

EFFECTIVE DATE:

OWNER:

OWNER’s Purchase Order NO.:

City of Nashua, NH

Upon City Approval

CONTRACTOR:

ENGINEER:

You are directed to make the following changes in the Contract Documents:

Description:

Justification:

Change Order #

1 of 2

Summary

CHANGE IN CONTRACT PRICE:

Original Contract Price

$

CHANGE IN CONTRACT TIMES:
Original Contract Times

Substantial completion:
Ready for final payment:

Net changes from previous Change Orders

$

Net change from previous Change Orders

Contract Price prior to this Change Order

$

Contract Times prior to this Change Order

Substantial completion:
Ready for final payment:

Net Increase (deerease} of this Change Order

$

Net Increase (decrease) of this Change Order

Contract Price with all approved Change Orders

Contract Times with all approved Change Orders

$ Substantial completion:
Ready for final payment:
RECOMMENDED: ACCEPTED: APPROVED:
By: By: By:
Sanborn, Head & Associates Name Mayor Jim Donchess
Engineer Contractor Owner
(Authorized Signature) (Authorized Signature) (Authorized Signature)
Date: Date: Date:

Change Order #

2 of 2

CERTIFICATE OF SUBSTANTIAL COMPLETION

PROJECT:

OWNER’S CONTRACT NO:

DATE OF ISSUANCE:
OWNER: City of Nashua, NH

OWNER’s Purchase Order NO.:

CONTRACTOR:

ENGINEER: DPW Engineering

This Certificate of Substantial Completion applies to all Work under the Contract Documents or to the
following specified parts thereof:

TO City of Nashua
(OWNER)
And To
(CONTRACTOR)

The Work to which this Certificate applies has been inspected by authorized representative of OWNER,
CONTRACTOR, and ENGINEER, and that Work is hereby declared to be substantially complete in
accordance with the Contract Documents on

(DATE OF SUBSTANTIAL COMPLETION)

A Tentative list of items to be completed or corrected is attached hereto. This list may not be all-inclusive,
and the failure to include an item in it does not alter the responsibility of CONTRACTOR to complete all
the Work in accordance with the Contract Documents. The items in the tentative list shall be completed or
corrected by CONTRACTOR within days of the above date of Substantial Completion.

From the date of Substantial Completion the responsibilities between OWNER and CONTRACTOR for
security, operation, safety, maintenance, heat, utilities, insurance and warranties and guarantees shall be as
follows:

1 of 2
Certificate of Substantial Completion

PAYMENT BOND
KNOW ALL MEN BY THESE PRESENTS: that
, (contractor name),
, (contractor address), a
(corporation partnership, individual), hereinafter called
Principal, and , (surety name),
, (surety address) herein after called
surety, are held and firmly bound unto ,
(owner name), , (owner address)
hereinafter called OWNER and unto all persons, firms, and corporations who or which may furnish labor, or who furnish
materials to perform as described under the contract and to their successors and assigns, in the total aggregate penal
sum of dollars, ($ ) in lawful money of the United States, for the payment
of which sum well and truly to be made, we bind ourselves, our heirs, executors, administrators, successors, and assigns,
jointly and severally, firmly by these presents.

THE CONDITION OF THIS OBLIGATION is such that whereas, the Principal entered into a certain contract with the
OWNER, dated the day of , 20___, acopy of which is hereto attached and made a part
hereof for the construction of

NOW, THEREFORE, if the Principal shall promptly make payment to all persons, firms, and corporations furnishing
materials for or performing labor in the prosecution of the WORK provided for in such contract, and any authorized
extension or modification thereof, including all amounts due for materials, lubricants, oil, gasoline, coal and coke, repairs
on machinery, equipment and tools, consumed or used in connection with the construction of such WORK, and for all
labor cost incurred in such WORK including that be a subcontractor, and to any mechanic or materialman lienholder
whether it acquires its lien by operation of State or Federal Law; then this obligation shall be void; otherwise to remain in
full force and effect.

PROVIDED, that beneficiaries or claimants hereunder shall be limited to the subcontractors, and persons, firms, and
corporations having a direct contract with the PRINCIPAL or its SUBCONTRACTORS.

PROVIDED FURTHER, that the said Surety for value received hereby stipulates and agrees that no change, extension of
time, alteration or addition to the terms of the contract or to the WORK to be performed thereunder or the
SPECIFICATIONS accompanying the same shall in any way affect its obligation on this BOND, and it does hereby waive
notice of any such change, extension of time, alteration or addition to the terms of the contract or to the WORK or to the
SPECIFICATIONS.

PROVIDED, FURTHER that no suit or action shall be commenced hereunder by any claimant: (a) Unless claimant, other
than one having a direct contract with the PRINCIPAL shall have given written notice to any two of the following: The
PRINCIPAL, the OWNER, or the SURETY above named within ninety (90) days after such claimant did or performed the
last of the work or labor, or furnished the last of the materials for which said claim is made, stating with substantial
accuracy the amount claimed and the name of the party to whom the materials were furnished, or for whom the work or
labor was done or performed. Such notice shall be served by mailing the same by registered mail or certified mail,
postage prepaid, in an envelope addressed to the PRINCIPAL, OWNER, or SURETY, at any place where an office is
regularly maintained for the transaction business, or served in any manner in which legal process may be served in the
state in which the aforesaid project is located, save that such service need not be made by a public officer; (b) After the
expiration of one (1) year following the date on which PRINCIPAL ceased work on said CONTRACT, it being understood,
however, that if any limitation embodied in the BOND is prohibited by any law controlling the construction hereof, such
limitation shall be deemed to be amended so as to be equal to the minimum period of limitation permitted by such law.

Page 5 of 15