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To:

From:

Re:
B. Motion:

Attachments:

Discussion:

City of Nashua, Public Works Division
Board of Public Works Meeting Date: May 18, 2017

Noelle Osborne, Plant Operations Supervisor
Wastewater Department

Polymer

To approve the contracts with Polydyne of Riceboro, GA in the amount of $300,000 and
BASF Corporation of Florham Park, NJ in the amount of $10,000. Funding will be
through: Department: 169 Wastewater; Fund: Wastewater; Account Classification: 61
Supplies & Materials.

Vendor quotes

Polymer is a product used at the plant to coagulate sludge. The Facility has three different
types from two different manufacturers that best fit our needs.

Periodically, the Facility has different companies come in and do bench testing to ensure
we are using the best polymer for the best price to meet our needs. We have recently
changed our poiymer for our inclined screw presses, which has produced a drier product,
saving the City a significant amount of money in trucking costs. The product we are
currently using is Polydyne NE2180. Additionally, we have selected a new product for
our gravity belt thickeners, at a lower price point, again resulting in a savings for the
City. This product is Polydyne C-6266.

Polydyne is offering the City a unit price of $1.03/lb for both of these products for the
FY18 year. Our annual estimated cost for these two polymers is $300,000.

The third type of polymer, Zetag 4110 dry, is for the Wet Weather Facility to be used
during rain events. This product is specific to this process and needs to be purchased
through a separate vendor to meet the molecular weight and electrical charge that is
optimum for the facility’s sludge processing needs. This final polymer is quoted at $2.53/
lb. and we estimate the annual cost to be $10,000.

Ci=- BASF

We create chemistry

June 17, 2015

Performance Chemicals
Water Solutions, North America EV/WN

Geraldine Ciardelki

DPW Administration

Nashua Wastewater Treatment Facility
* 23353 Sawmill Road

City of Nashua, NH 03060

Reference: Price Extension

Dear Ms Ciardelli,
BASF Corporation is pleased to extend pricing to the City of Nasbua, NH, as noted below from July 1, 2015 to
June 30, 2016.
Product Package Net Wt. Price ($/1b) Additional
information
(Quantity
Requirements,
etc.)
Zetag® 7878 FS40 =| TOTES 2,205 tbs $1.92
Zetag® 4110 BAGS 55 Ibs $2.53 36 bags per pallet
BASF Corporation
100 Park Avenue

Fiortam Park, NJ 07932
www. basfes

a

( .

\ THE CITY OF NASHUA “The Cate City’

Financial Services

Purchasing Department

{EE ORES POTTERY oe Re rn We eS IID TEE ES np

June 29, 2017
Memo #18-003

TO: MAYOR DONCHESS
FINANCE COMMITTEE

SUBJECT: SIPHON COVERS INSTALLATION — CHANGE ORDER #2 (VALUE: $16,618)
DEPARTMENT: 169 WASTEWATER; FUND: WASTEWATER

Please see the attached communication from Noelle Osborne, Wastewater Department Operations
Supervisor, dated June 22, 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 (6/22/2017 BPW meeting)

and the Purchasing Department recommend the approval of this change order in the amount of $16,618
to William P. Davis Excavation, LLC of Portsmouth, NH.

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Y bag Si

io#

Wan Kooken
Purchasing Manager

Ce: N Osborne L Fauteux

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

To:

From:

Re:

G. Motion:

Attachments:

Discussion:

City of Nashua, Public Works Division

Board of Public Works Meeting Date: June 22, 2017

Noelle Osborne, Plant Operations Supervisor
Wastewater Department

Change Order #2 - Siphon Covers Installation project

To approve Change Order #2 for the installation of new siphon and manhole covers
project to William P. Davis Excavation, LLC, of Portsmouth, NH in amount of
$16,617.50. Funding will be through: Department: 169 Wastewater — Account
Classification: 54 Property Services.

Change Order 2

The vortex structure at the wastewater treatment facility is designed to dissipate energy in
the wastewater flow where the Salmon Brook Interceptor meets the South Merrimack
Interceptor. The vortex structure consists of an 8-foot diameter top section and a lower 4-
foot diameter section that extends over 30 feet deep. Upon original installation of the
vortex, the access manhole was not centered over the vortex, leaving no access to clean
the vortex. A new, larger opening centered over the vortex structure is needed.

The new concrete top slab will have a centered hatch opening and built-in safety grate.
William P. Davis Excavation, who completed the work for the siphon cover upgrades
project, was requested to put together a cost proposal for a new top slab on the vortex.
Davis Excavation is ideally situated for this work from their experience with the
installation of new hatch and safety grates during the siphon cover upgrades project.

Davis Excavation was awarded the siphon project in January 2017 in the amount of
$49,875. Change order 1 for the installation of new bolts to replace the existing stripped
bold on covers increased the contract amount by $4,996.20 to a new total amount of
$54,871.20. This change order is in the amount of $16,617.50 brings the new total
contract amount to $71,488.70.

Davis Excavation has satisfactorily completed the siphon cover installation project within
the project schedule and on budget. Their costs are considered reasonable and they will
be able to start in timely manner when requested to do so by the Wastewater Department.

CHANGE ORDER
No. 1

PROJECT: Upgrade of Sewer System Siphon Covers

OWNER’S CONTRACT NO:_ RFP1087-120916

EXECUTED CONTRACT DATE: February 1, 2017

DATE OF ISSUANCE: June 27, 2017 EFFECTIVE DATE: Upon City Approval
OWNER: City of Nashua, NH

OWNER’s Purchase Order NO.: 131720

CONTRACTOR: William P. Davis, Excavation LLC

ENGINEER: DPW Engineering

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

Description:

» Replace existing vortex structure top slab with new center access top slab with hatch
» Time Extension to complete Change Order #2

Attachment:

> William P. Davis, LLC Change Order #002 Proposal dated May 24, 2017

Change Order #2 1 of 2
Upgrade of Sewer System Siphon Covers

Summary

CHANGE IN CONTRACT PRICE:

Original Contract Price

$49,875.00

CHANGE IN CONTRACT TIMES:
Original Contract Times

Substantial completion: April 28, 2017
Ready for final payment: May 26, 2017

Net changes from previous Change Orders

$4,996.20

Net change from previous Change Orders

none

Contract Price prior to this Change Order

$54,871.20

Contract Times prior to this Change Order

Substantial completion: April 28, 2017
Ready for final payment: May 26, 2017

Net Increase (deerease} of this Change Order

$16,617.50

Net Increase (deerease} of this Change Order

Substantial completion: September 1, 2017
Ready for final payment: September 31, 2017

Contract Price with all approved Change Orders

Contract Times with all approved Change Orders

$71,488.70 Substantial completion: September 1, 2017
Ready for final payment: September 31, 2017
RECOMMENDED: ACCEPTED: APPROVED:
By: By: By:

DPW Engineering Name Mayor Jim Donchess
Engineer Contractor Owner
(Authorized Signature) (Authorized Signature) (Authorized Signature)

Date: Date: Date:
Change Order #2 2 of 2

Upgrade of Sewer System Siphon Covers

Change Order Form
Change Order #002 - 5/24/2017

Project: Upgrade of Sewer System Access Covers
Location: Nashua, NH

Description: Replace existing vortex structure top slab with new center access top slab with hatch.

Saw cut and remove pavement (18’x18’) on and around existing structure. Excavate to expose entire top slab section.
Drill & install lifting points. Crane onsite to remove existing top slab and set new top slab in place. Existing top slab
will be demolished onsite and concrete ruble to be disposed of. Form and caste in place new H20 rated aluminum
access hatch w/ safety grate to finish grade. Backfill, compact, and fine grade. Place 4” asphalt patch to match
existing grades.

> Total Summary:

Materials: $5,090.00
Rental / Subcontractor: $4,400.00
Labor: $4,960.00
Overhead / Profit 15% = $2,167.50 $2,167.50
Total: $16,617.50
Contract Time Extension: TBD

> Material:

Precast Top Slab 1 EA @ $1,150.00 $1,150.00
Concrete / Rebar / Form 1 EA @ $725.00 $725.00
Lifting Anchors 1 EA @ $290.00 $290.00
H20 42”X42” Hatch 1 EA @ $2,925.00 $2,925.00
Sub Total $5,090.00

> Rental / Subcontractor:

2500LB Hammer W/ Machine 1 Day @ $975.00 $975.00
Vio 45 Ex 3 Day @ $275.00 $825.00
C6500 Dump Truck 12 HR @ $75.00 $900.00
Service Truck W/ Tools 4 Day @ $175.00 $700.00
Crane 1 EA @ $1,000.00 $1,000.00
Sub Total $4,400.00
> Labor:
Supervisor 32 Hours @ $65.00 Per $2,080.00
Labor 32 Hours @ $45.00 Per $1,440.00
Labor 32 Hours @ $45.00 Per $1,440.00
Sub Total $4,960.00

nn a 1 TAA MSA EZ,

Authorized Signature:

WILLIAM P DAVIS EXCAVATION LLC

PO BOX 758 - HAMPTON, NH 03843

(2 THE CITY OF NASHUA the Gate City’

Financial Services

Purchasing Department

PASI SE rt wee me sete entree

June 29, 2017
Memo #18-004

TO: MAYOR DONCHESS
FINANCE COMMITTEE

SUBJECT: | PUMP STATION UPGRADES DESIGN SERVICES — FINAL DESIGN (VALUE:
$461 569)
DEPARTMENT: 169 WASTEWATER; FUND: WASTEWATER

Please see the attached communication from Noelle Osborne, Wastewater Department Operations
Supervisor, dated June 22, 2017 for the information related to this purchase.

Pursuant to NRO § 5-83 Professional Services (A) In the purchase of accounting, architectural, auditing,
engineering, legal, medical and ambulance services and purchases of independent professional
consultant services for personnel, data processing, actuarial, planning, management and other
comparable purchases competitive bidding shall not be required.

The Wastewater Department Operations Supervisor, Board of Public Works (6/22/2017 BPW meeting)
and the Purchasing Department recommend the award of this contract in the amount of $461,569 to
Woodard & Curran of Portland, ME.

ey

fe ra
— Dan Kooken
Purchasing Manager

Respectfully,

Coc: N Osborne L Fauteux

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

From:

Re:

I. Motion:

Attachments:

Discussion:

City of Nashua, Public Works Division

Board of Public Works Meeting Date: June 22, 2017

Noelle Osborne, Plant Operations Supervisor
Wastewater Department

Pump Station Upgrades Design Services — Final Design

To approve the contract award for final design phase of the Pump Station
Upgrades to Woodard & Curran of Portland, ME in amount not to exceed
$461,569. Funding will be through: Department: 169 - Wastewater; Fund:
Wastewater; Activity: Pump Station Upgrades.

Pump Station Upgrades ~- Final Design Phase-Scope of Work and Fee

There are fourteen (14) City owned pump stations throughout Nashua. These
pump stations are all the original installations which range from 30-55 years
old. Complete upgrades of all pump station are needed, which includes new
communications to the Wastewater Treatment Facility’s SCADA program.

Woodard & Curran was hired initiaiiy to perform a preliminary evaluation and
provide recommendations of the upgrades needed at all 14 locations.
Following the preliminary phase work they completed a 30% design of this
project. This work included most of the survey and geotechnical work needed
to move into final design.

Woodard and Curran will next complete the final design, prepare construction
bidding documents and assist with the construction bidding phase. We
recommend continuing this work with W&C since they have performed the
previous work competently and within budget. Their costs for the final design
was negotiated and is now reasonable for the scope of work involved. This
project is eligible for a 20% State Aid Grant from the New Hampshire
Department of Environmental Services.

COMMITMENT & INTEGRITY 47 Hutchins Drive T 800.426.4282?

DRIVE RESULTS Portland, Maine 04102 VT A07 774.2142
www.woodardcurran.com F 207.774.6635
FINAL DESIGN

, PUMP STATIONS UPGRADE PROJECT
a NASHUA, NH
<a

be \ —-—-s BACKGROUND

EoRAe The City of Nashua has fourteen pump Stations of different sizes, types and ages. Like many
other cities Nashua decided to review and upgrade all pump stations for reasons including but
not limited to: ensure proper and reliable operation to limit sanitary sewer overflows, address
failing force mains, meet current safety standards, improve ease of maintenance and
accessibility for staff at each station, and take advantage of new technology for the betterment
of the community. In many stations, the pumping and controls equipment is beyond its
expected life. After an RFQ process and interviews, Woodard & Curran was selected to
complete this project to review and upgrade the City’s pump stations.

PREVIOUSLY COMPLETED WORK

The investigation phase of the project was approved by the Board of Public Works in October
2015 and a multiday investigation took place with Woodard & Curran engineers and plant
management and staff in November 2015. The summary report for this investigation was
delivered to the City in January 2016 and presented to city management and wastewater
treatment plant staff on March 9, 2016.

The preliminary design phase of the project was approved by the Board of Public Works in July
2016 and a Design Basis Report (DBR) was delivered to the City and presented to city
management and wastewater treatment plant staff on January 19, 2017. The DBR presented
the City with recommended upgrade options and estimates of probable construction cost for
each station based on preliminary engineering analysis of layout, mechanics, hydraulics and
constructability. The city was able to use this information to make decisions on how to proceed
so Woodard & Curran could continue to the final design phase. The City provided Woodard &
Curran with a memorandum dated February 10, 2017 summarizing the City’s design decisions
relative to the recommendations included in the DBR and outlining additional design requests.

Since the City’s February 10, 2017 memorandum, Woodard & Curran has completed additional
preliminary design tasks to evaluate several of the City’s design requests at the Northgate and
Spalding stations. A site visit was conducted on March 30, 2017 with city wastewater
treatment plant staff and structural and electrical engineers from Woodard & Curran. The
purpose of this site visit was to conduct a more extensive condition assessment of the
structural and electrical components of the pump station to verify that the City’s current
upgrade design objectives could be achieved relative to upgrading, as opposed to fully
replacing, the pump station. Site visits were also conducted on April 17, 2017 to Trestle Brook
and Santere pump stations to perform structural observations and assessments of the wet
wells and dry wells at each station and for the building at Trestle Brook.

On April 13, 2017 a teleconference was conducted including city wastewater staff, the city’s
hydraulic modeling consultant Hazen and Sawyer and Woodard & Curran to discuss modeling
results related to the preliminary design to eliminate the Spalding pump station.