Agenda

B-6.!

CHANGE ORDER
No. 2
PROJECT: _Headworks Upgrade DATE OF ISSUANCE:
OWNER: City of Nashua
229 Main St, Nashua, NH 03062
(Address)

CONTRACTOR: T-Buck Construction, Inc. OWNER’s Project No.

CONTRACT FOR: _Headworks Upgrade ENGINEER _Wright-Pierce
ENGINEER’s Project No. 13089

You are directed to make the following changes in the Contract Documents.
Description: Refer to the Attachments.

Purpose of Change Order: Refer to the Attachments.

Justification: Refer to the Attachments.

To:

From:

Re:

C. Motion:

Attachments:

Discussion:

City of Nashua, Public Works Division

Board of Public Works Meeting Date: January 26, 2017

Noelle Osbome, Plant Operations Supervisor
Wastewater Department

Headworks Upgrade Project

To approve the change order to the Headworks Upgrades contract with T-Buck
Construction, Inc. in the amount of $47,438.05. Funding will be through: Department:
169 Wastewater; Fund: SRF Loan; Activity: Headworks Upgrades.

Change Order 2 Backup

=) THE CITY OF NASHUA ‘The Cate City’

Financtal Services

Purchasing Department

January 26, 2017
Memo #17-095

TO: MAYOR DONCHESS
FINANCE COMMITTEE

SUBJECT: HEADWORKS UPGRADE PROJECT APPROVAL FOR CHANGE ORDER #2 (VALUE:
$47,438)
DEPARTMENT: 169 WASTEWATER; FUND: SRF LOAN

Please see the attached communication from Noelle Osborne, Wastewater Department Operations
Supervisor, dated January 26, 2017 for the information related to this purchase.

Specification 15210 - High Density Polyethylene (HDPE) Pipe, Fittings, And Appurtenances

August 2016

Page 9 of 9
3066.07

ATTACHMENT 1 TO SECTION 15210
PIPE PRESSURE AIR TEST LOG

Project No.:
Project Name:
SANBORN | HEAD ————
Project Location:
Weather:
Contractor: Test No.:

Sanborn Head Personnel:

Person/Company Performing the Test:

Specification 15210 - High Density Polyethylene (HDPE) Pipe, Fittings, And Appurtenances Page 8 of 9
August 2016 3066.07

SANBORN I HEAD

Specification 15210 - High Density Polyethylene (HDPE) Pipe, Fittings, And Appurtenances Page 7 of 9
August 2016

3066.07

3.3

A.

PIPE TESTING

CONTRACTOR shall perform a pneumatic test on solid pipe and fittings greater
than 50 ft in length after placement in the trench, in accordance with the
Manufacturer’s recommendations.

Pipes shall be pressure tested in presence of ENGINEER. Provide a minimum 7
days notice to ENGINEER before performing test.

Pneumatic testing shall be performed as follows:

Specification 15210 - High Density Polyethylene (HDPE) Pipe, Fittings, And Appurtenances Page 6 of 9

August 2016

3066.07

d. US Standard round washers may be used on some flanges when in
accordance with the Manufacturer’s recommendations. Bolts shall be
lubricated in accordance with Manufacturer’s recommendations.

e. Torque flange bolts in sequence and in accordance with the
Manufacturer’s recommendations. Do not over-torque bolts.
CONTRACTOR shall use a torque wrench to tighten all flange
fasteners.

Specification 15210 - High Density Polyethylene (HDPE) Pipe, Fittings, And Appurtenances Page 5 of 9

August 2016

3066.07

C.

Prior to backfilling trench CONTRACTOR shall obtain as-built top of pipe
coordinates and elevations at grade changes, terminations, fittings, and at least
every 50 ft along the pipe.

3.2. INSTALLATION

A.

B.

Trench, backfill, and compact in accordance with Specification Section 02200.

Heat Fusion of Pipe:

1.

Specification 15210 - High Density Polyethylene (HDPE) Pipe, Fittings, And Appurtenances Page 4 of 9

August 2016

3066.07

2.3 GASKETS AND HARDWARE

A. All gaskets shall be Viton. Joint hardware shall be Type 316 stainless steel.

2.4 FITTINGS

A.

Fittings shall be manufactured from polyethylene compound having cell
classification equal to or exceeding compound used in pipe to ensure
compatibility of polyethylene resins.

Specification 15210 - High Density Polyethylene (HDPE) Pipe, Fittings, And Appurtenances Page 3 of 9

August 2016

3066.07

B.

Pipe and fittings shall be produced by the same manufacturer and from identical
materials meeting the requirements of this Section. Special or custom fittings
may be exempt from this requirement.

Pipe and fittings shall be pressure rated to meet the service pressure
requirements specified. Fittings shall be fully pressure rated to at least the same
service pressure rating as the joining pipe.