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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.

Fittings shall be from same manufacturer as pipe being provided. OWNER may
allow substitution for approved material with use of flanged joint sections.

Dimensions of fittings conforming to standard dimensions and tolerances in
accordance with ASTM D3261.

Fittings shall have the same or higher pressure rating as pipe.

Markings:

1. Manufacturer’s name or trademark.

2 Nominal size.

3. Type of plastic pipe.

4. Standard dimension ratio.

5 Extrusion date, lot number or batch number.

The Drawings do not show all fittings that may be required. CONTRACTOR shall
provide all fittings required for a complete installation.

PART 3 - EXECUTION

3.1 FIELD QUALITY CONTROL

A.

Pipe may be rejected for failure to conform to any of the following:

1. Fractures or cracks passing through pipe wall, except single crack not
exceeding 2 in. in length at either end of pipe, which shall be cut off and
discarded. All pipes within one shipment shall be rejected if defects exist in
more than five percent of shipment or delivery.

Cracks sufficient to impair strength, durability, or service ability of pipe.
Defects indicating improper proportioning, mixing, and molding.

Damaged ends, where such damage prevents making satisfactory joint.
Damage due to handling or installation. Scratches and gouges exceeding
five percent of the wall thickness shall be considered excessive, and may be
rejected by ENGINEER or OWNER.

ae wWN

Acceptance of fittings, stubs, or other specially fabricated pipe sections shall be
based on visual inspection by ENGINEER and documentation of conformance to
this Section.

SANBORN HEAD

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.

Weld pipe in accordance with the Manufacturer’s recommendation for butt
fusion methods. The Pipe Manufacturer shall certify fusion machine
operators.

Butt fusion equipment for joining procedures shall be capable of meeting
conditions recommended by the Pipe Manufacturer including, but not
limited to, temperature, alignment, and fusion pressures.

Branch saddle fusions shall be joined in accordance with manufacturer’s
recommendations and procedures. Branch saddle fusion equipment shall
be of a size to facilitate saddle fusion within the trench. Extrusion welds
shall not be allowed.

For cleaning pipe ends, solutions such as detergents and solvents, when
required, shall be used in accordance with the Manufacturer’s
recommendations. Solvents shall not be used unless approved by OWNER.
Do not bend pipe to greater degree than minimum radius recommended by
manufacturer for type and grade.

Do not subject pipe to strains that will overstress or buckle pipe or impose
excessive stress on joints.

Before butt fusing pipe, observe inside of each pipe length for presence of
dirt, sand, mud, shavings, and other debris or animals. Remove debris from
pipe prior to fusing.

Cap open ends of fused pipe at end of each working day to prevent entry by
animals, debris, or stormwater and potential escape of gas.

Use compatible fusion techniques when polyethylenes of different melt
indexes are fused together. Refer to the Manufacturer’s specifications for
compatible fusion.

Flange Jointing:

1.
2.

Use on flanged pipe connection sections.

Convoluted stainless steel backup rings shall be used for joining HDPE

pipes below grade, and epoxy-coated carbon steel backup flanges shall be

used above grade.

Butt fuse fabricated flange adapters to pipe or use electrofusion couplings.

Observe the following precautions in connection of flange joints:

a. Use full-face Viton gaskets only.

b. All fasteners and back-up rings shall be Type 316 stainless steel below
grade, and zinc-plated steel above grade.

c. Align flanges or flange/valve connections to provide tight seal.
Gaskets are required for flange/valve connections.

SANBORN HEAD

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.

Pull bolt down by degrees to uniform torque in accordance with the

Manufacturer’s recommendations.

Protect below grade bolts and flanges by covering with a 6-mil thick

polyethylene wrap. Duct tape wrap to HDPE pipe.

Electrofusion couplers, where used, shall be installed in accordance with

the Manufacturer’s specifications. The outside diameter of the HDPE pipe

and face shall be prepared in accordance with the Manufacturer’s
recommendations prior to installing the coupler.

Pipe Placement:

1.

2.

3.

o1

10.
11.

12.

Grade control equipment shall be of the type to accurately maintain design
grades and slopes during installation of pipe.

Unless otherwise specifically stated, install pipe in accordance with the
Manufacturer’s recommendations.

Maximum lengths of fused pipe to be handled as one section shall not
exceed 400 ft and shall be placed according to the Manufacturer’s
recommendations as to pipe size, pipe SDR, and topography so as not to
cause excessive gouging or surface abrasion. Pipe wall gouges deeper than
3/16-in. shall be cause for rejection of the pipe.

Cap pipe sections longer than single joint (usually 40 ft) on both ends
during placement except during fusing operations.

Remove dirt or debris from inside of pipe before backfilling.

Notify ENGINEER prior to installing pipe into trench and allow time for
observation. CONTRACTOR shall correct irregularities identified during
observation.

Complete connections within trench whenever possible to prevent
overstressed connections.

Allow pipe sufficient time to adjust to trench temperature prior to testing,
fusion welding, making segment connections, or backfilling activity.

To reduce branch saddle stress, install saddles at slope equal to and
continuous with connecting pipe.

Install reducers adjacent to laterals and tees unless directed otherwise.
Place pipe system in trench allowing at least 12 in./100 ft for thermal
contraction and expansion.

Trench and backfill soil in accordance with Specification Section 02200.

SANBORN 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:

1. The test period at the test pressure shall last no less than 10 minutes.

2. Provide all necessary connections, bulkheads, flanges, bracing, and
blocking, as well as all required test equipment.

3. Test pressure gauges:

a. For GCCS and condensate main pipes, the test pressure gauge shall
have a maximum range of no more than 20 psig, with minor
gradations no greater than 0.1 psig.

b. For the compressed air pipe, the test pressure gauge shall have a
maximum range of no more than 200 psig, with minor gradations no
greater than 1 psig.

4. Pipe to be tested shall be exposed in the trench, except bends, reduced
pressure rated fittings and components, which shall be buried or
restrained. Flange connections shall be visible to check for leaks.

5. Test pressure:

a. For GCCS and condensate main pipes, the test pressure shall be 10
psig.

b. For the compressed air pipe, the test pressure shall be 150 psig.

6. Test shall be accepted if the pressure drop over 10 minutes is less than 5
percent of the pressure at the beginning of the test period.

Test Report

1. ENGINEER shall prepare and submit to OWNER a test report using the

attached forms for each pipe system tested. Include following information
in test report.

Date of test.

Description and identification of pipe system tested.
Type of test performed.

Test fluid.

Test pressure.

Results of test.

Type and location of leaks detected.

Corrective action taken to repair leaks.

Results of retesting.

Name of person performing test.

Treg me ao oD

[END OF SECTION 15210]

SANBORN HEAD

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

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:

Date of Test: Time of Test: Finish:
Pipe Length: ~ ft. ‘pe Diameter: Pipe Material: Pipe SDR/Sch.::
Rated Working Pressure: Test Pressure: psi
Location/ designation of pipe tested:
t T Pr Pe
Time Pipe Temperature Pressure Gauge Reading Pressure Drop
(min.) (°C) (psig) (%)
0
5
10
15
30
60
Pass Fail Retest? Yes No

Description of leaks and repairs of retested pipe segments:

P -P
P.= Percent Pressure Drop DT x 100

oO

P, = Initial Pressure Gauge Reading

P,; = Pressure Gauge Reading at Time t

Comments:

Signature:

SANBORN HEAD

=) 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.

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 Wastewater Department Operations Supervisor, Board of Public Works (1/26/2017 meeting) and the
Purchasing Department recommend approval of this Change Order #2 in the amount of $47,438 to
TBuck Construction, Inc. of Auburn, ME.

Respectfully, .

. VDah Kooken
Purchasing Manager

Cc: N Osborne L Fauteux

[229 Main Street ¢ Nashua, New Hampshire 03061 Phone (603) 589-3330 « Fax (603) 589-3233

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 contract with TBuck for the Headworks Upgrades at the Wastewater Treatment
Facility is for $2,848,222. Change order 1 in the amount of $8,460.75 was for the
installation of a 6” insertion valve on the 6” protected waterline.

This change order is for a number of items as shown in the attached backup material
including new lockers for the men’s locker room, making the new women’s locker
room ADA compliant, relocating pipes and ducts due to conflicts, replacing a waterline
valve that does not work, and changing out the electric circuit for a new heater. These
additions were not known during the design phase since some pipes, particularly drain
pipes are often concealed behind wall and the conflict was not known till the contractor
began removing walls according to the plans.

The total amount of this change order comes to $47,438.05. The Engineer (Wright
Pierce) and Wastewater Department has reviewed these costs and appear to be in line
with work to be done. The new value of their contract following this change order will
be in the amount of $2,904,120.80.

This project is an SRF funded project and the City will be seeking a State Aid Grant
(SAG) in the amount of 20% of the costs should such funding become available.

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.

Attachments: Change Order No. 2 Summary Sheet, Change Order No. 2 Items 1-9 back-up documentation.

CHANGE IN CONTRACT PRICE CHANGE IN CONTRACT TIME
Original Contract Price Original Contract Time
$ _2,848,222.00 455
(days or date)
Previous Change Orders Net change from previous Change Orders
$ 8,460.75 5
(days)
Contract Price prior to this Change Order Contract Time prior to this Change Order
$ _2,856,682.75 460
(days or date)
Net Increase (Decrease) of this Change Order Net Increase (decrease) this Change Order
$ 47,438.05 21
(days)
Contract Price with all approved Change Orders Contract Time with all Change Orders
$ _2,904,120.80 481
{days or date)

This document will become a supplement to the CONTRACT and all provisions will apply hereto. The
attached Contractor’s Revised Project Schedule reflects increases or decreases in Contract Time as
authorized by this Change Order.

Stipulated price and time adjustment includes all costs and time associated with the above described change.
Contractor waives all rights for additional time extension for said change. Contractor and Owner agree that
the price(s) and time adjustment(s) stated above are equitable and acceptable to both parties.

RECOMMENDED: APPROVED: APPROVED: APPROVED:
By: By: By: By:
Engineer Owner Contractor NHDES
aalt7
Date Date Date Date

13089A

CITY OF NASHUA, NEW HAMPSHIRE
WWTF HEADWORKS UPGRADE PROJECT
Change Order No. 2 Summary

Item No.

Description

Reason

Amount

Notes

Locker Replacement

City request to replace the remaining 30 lockers in the Men's Locker Room.

$14,199.93

T-Buck CP No.

1R-1, Dec. 5, 2016

Women's Shower Stall

City Building Department comments required the shower stall in the
Women's Locker Room be revised to an ADA-compliant unit.

$ 1,881.25

T-Buck CP No.

10, Dec. 1, 2016

Horn and Strobe Replacement

‘The existing Hazardous Gas Detector Horn and Strobe do not meet current
standards (are not explosion-proof). Relocation of the detector is part of this
project, and to complete this work the unit will need to be brought up to
code.

$ 11,073.75

T-Buck CP No.

12, Dec. 2, 2016

Wet Weill Ductwork

HVAC ducts in the Wet Well were damaged as a result of flooding; ducts
require replacement in order for the system to function properly.

$ 1,487.50

T-Buck CP No.

4, Dec. 16, 2016

Relocate 2-inch City Water

A 2-inch City Water line in the new Women's Locker Room needs to be
relocated to avoid a conflict with the new CMU wall being constructed as
part of the this project.

$ 1,987.38

T-Buck CP No.

6R-2, Dec. 21, 2016

Rain Leader Relocation

A 6-inch rain leader located in the corridor wall of the first floor requires
relocation as it will conflict with construction in the expanded Screenings
Room.

§ 9,029.00

T-Buck CP No.

8, Dec. 16, 2016

Install 3-inch Valve

City request to replace an existing 3-inch valve on the protected water line
located in the Boiler Room. Existing valve does not function properly; a new
valve is required to isolate the water line.

$ 2,906.74

T-Buck CP No.

9, Dec. 16, 2016

Hot Water Heater Feed

The existing power circuitry available was not compatible with the proposed
hot water heater installed in the Boiler Room.

$ 2,653.75

T-Buck CP No.

11, Dec. 2, 2016

Offset Odor Control Duct

There is a conflict between the new 30-inch odor control duct and an
existing 6-inch DIP generator drain; the duct will be off-set to avoid the
conflict.

$ 2,218.75

T-Buck CP No.

13A, Jan. 6, 2017

Total

$ 47,438.05 |