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SANBORN HEAD

Building Trust. Engineering Success.

TO BIDDERS OF RECORD November 16, 2016

Re:

File No. 3066.07
Addendum No. 1
Contract and Technical Documents
Spring 2017 Landfill Gas System Expansion (IFB0593-113016)
Four Hills Landfill
Nashua, New Hampshire

This Addendum shall be part of the Contract Documents for the above-referenced project.
Please acknowledge receipt of this Addendum in your bid for this project.

Responses to Questions from Bidders

1.

What are the depths of the existing wells which in which dewatering pumps will be
installed?

A: The attached Table A provides the depths for each of the wells.

What type of valves should be installed for the air and discharge lines shown on Detail 1
on Sheet 5 of the Construction Drawings?

A: Standard brass or high-density polyethylene (HDPE) ball valves are acceptable.

Detail 5 on Sheet3 shows geotextile over the top of the trench. Is the geotextile
required only on the top of the trench or on all sides?

A: The geotextile is required on the top of the trench only.

Is geotextile required below and above the draintube piping? If so, what type of
geotextile?

A: Nonwoven geotextile is part of the composite Draintube™ material.

On Detail 1 on Sheet 7, what is meant by “one roll width” shown at the top of the detail?
A: It signifies one roll width of Draintube™. Each roll is approximately 13 feet wide.
Will any seeding or re-vegetation be required?

A: The Contractor will not be responsible for seeding or re-vegetation.

Can you provide the name and contact of the surveyor the landfill uses on-site?

SANBORN, HEAD & ASSOCIATES, INC. www.sanbornhead.com

CITY OF NASHUA
NEW HAMPSHIRE

Annual Comprehensive Financial
Report

For The Fiscal Year Ended
June 30, 2021

Prepared by:
The Financial Services Division

John L. Griffin Rosemarie Evans

Chief Financial Officer Comptroller
Treasurer/Tax Collector

November 16, 2016 Page 2
20161116 Addendum No 1.docx 3066.07

A: The City does not have a designated surveyor. The surveyors below are local and
have worked on this site in the past.

WSP (Nashua, NH)
Hayner Swanson, Inc. (Nashua, NH)

Meridian Land Services, Inc. (Amherst, NH)

8. All excavated material (including waste) can be placed back in the trenches with the
pipe?

A: Excavated Material, where called out on the construction drawings, may include
waste.

9. All excess waste to be hauled by contractor directly to the working face?
A: Yes
10. Site work hours? Saturday and Sunday work?
A: Monday - Friday 7am - 5pm; Saturday 8am-1pm.
11. Any retainage to be withheld from invoicing? If so, amount?
A: Refer to Contract Documents, Article 6: Payment Procedures.
12. No union, davis-bacon, or prevailing wages?
A: No

13. Assume all backfill and or required bedding materials located on-site at no additional
cost to contractor?

A: Soil backfill is available on site for use by the Contractor.

14. How far is the borrow pit located from the proposed work areas?
A: The borrow bit is located adjacent to the landfill (less than % mile).

15. Are the existing well boots (where bentonite seals are to be installed) 10x10 PVC
Boots.? ] assume they are a temporary boots that slide over the well and vacuum riser

and are not welded to any liner? Please clarify.

A: The existing boots are premanufactured 10ft x10ft HDPE and are not welded toa
liner.

SANBORN HEAD

November 16, 2016 Page 3
20161116 Addendum No 1.docx 3066.07

Clarification on Work Performed

1. During the pre-bid meeting, a potential bidder suggested that repairs to penetrations
(shown on Detail 3 on Sheet 7 of the Construction Drawings) in the Draintube™ model
600CW LFG4 D25 Surface Collection Layer be extrusion welded. This was considered,
however; based on discussions with the material manufacturer after the pre-bid
meeting, it was recommended that butyl tape be used instead of welding. This method
has since been discussed with and approved by the City of Nashua.

To clarify, Draintube™ that is cut and removed in order to fit the Draintube™ over the
existing wellheads shall be saved and re-installed/secured with butyl tape. The tape
will be used to rejoin the material and create a seal around the existing risers to the

extent practical. Breaks in the 1-inch diameter Draintube™ pipes shall be reconnected
using snap couplers provided by the Draintube™ manufacturer.

Very truly yours,
SANBORN, HEAD & ASSOCIATES, INC.

R pba

Project Manager
RLC/ESS:rlc

Encl. Table A: LFG Well Depth Summary

cc: Kerry Converse, Jeff Lafleur, Dan Kooken, Kathleen Carragan - City of Nashua

P:\3000s\3066.07\ Source Files\2016 LFG Const\Bidding\Addenda\1\20161116 Addendum No 1.docx

SANBORN HEAD

TABLEA
LFG Well Depth Summary

Four Hills Landfill
Nashua, New Hampshire

| | Elevation (ft) Well Depth
Well Designation Bottom of | Approximate (ft)
Screen Top of Casing

VB 219.2 267 47.8

VC 219.7 270 50.3
VOO5R 218.0 286 68

VOO6R 217.5 286 68.5
VO0O7R 220.0 286 66
VOO8R 224.0 264 40
Vo11 218.0 268 50
V017 232.0 274 42
V018 216.0 286 70
Vo21 219.0 271 52

P:\3000s\3066.07\Source Files\2016 LFG Const\Bidding\Addenda\l\LFG Well Depths.xlsx

Sanborn, Head & Associates, Inc.

SANBORN HEAD

Building Trust. Engineering Success.

TO BIDDERS OF RECORD November 23, 2016

Re:

File No. 3066.07
Addendum No. 2
Contract and Technical Documents
Spring 2017 Landfill Gas System Expansion (IFB0593-113016)
Four Hills Landfill
Nashua, New Hampshire

This Addendum shall be part of the Contract Documents for the above-referenced project.
Please acknowledge receipt of this Addendum in your bid for this project. Responses to
the questions received from bidders are provided in italic font.

Responses to Questions from Bidders

1.

Per the Invitation for Bids, how is the use of environmental materials taken into
consideration when evaluating price?

The use of environmentally sound materials is encouraged. However, the benefit of using
any type of alternate material must be evaluated against the cost and function of
traditional materials to ensure performance is not compromised and any additional cost
can be justified.

Please clarify the binding period for submitted bids. Invitation for Bids states bids are
bound for 90 days and the Bid Form states bids are subject to acceptance for 60 days.

Attached is a revised Page 1 of 8 of the Bid Form indicating bids will remain subject to
acceptance for 90 days after the bid opening. Please replace the original Page 1 with this
revised Page 1.

Please clarify the tax requirements for the project. Invitation for Bids states the City is
exempt of all taxes, does this impact the project?

This typically applies to sales tax. Unit prices quoted for materials cannot include sales
tax.

The “Supplementary Conditions” are referenced throughout the Agreement and General
Conditions. Is there a Supplementary Conditions document and is it applicable?

The City contracts attached to the Invitation to Bid are templates and are not intended to
be project specific. The term “Supplementary Conditions” is used to advise the Contractor
that there may be supplementary conditions that apply. It is not always known, prior
to pre-bid, contractor questions, etc. whether a supplementary condition needs to be
included, though it is rare to have them added after the fact. Typically, the City will strike

SANBORN, HEAD & ASSOCIATES, INC. www.sanbornhead.com

November 23, 2016 Page 2
20161123 Addendum No 2.docx 3066.07

out “Supplementary Conditions” in the agreement prior to execution if in fact none are
applicable.

5. Please clarify whether GC Article 5.05 Property Insurance (Builders Risk) is required
and please specify the value of any existing structures that need to be insured, if any.

Builders Risk insurance is only required if the project involves structural changes to a
building.

6. On Sheet 3, Detail 2 of the bid drawings, an electrometric adaptor kit is referenced. Can
you please confirm what is meant by this detail? May I assume that an elastomeric
adapter kit is required in this particular instance?

Yes, this is a typo. It should read “elastomeric” adapter kit.

7. In Section 02200 of the Technical Specifications, Part 2, Item 2.2 Materials, Letter B,
there is no mention of the stone being non-calcareous. Can you please confirm if there
are any testing requirements for the stone [specifically is ASTM-D3042 is required]?

There are no testing requirements for the stone; however, CONTRACTOR shall confirm
stone type(s) with the supplier and demonstrate to the ENGINEER that the stone proposed
for use on the project is of a type(s) that is non-calcareous.

8. Can you please confirm that all pipe needs to be D2513? It is my understanding that
D2513 does not apply to any pipe with perforations and is typically required of pipe
that will be used to convey gas.

ASTM D2513 is referenced in the technical specifications to define dimension ratio (pipe
diameter vs. pipe wall thickness) for high-density polyethylene (HDPE) pipe. For this
project, HDPE pipe for gas collection shall be SDR-17; fittings may be SDR-17 or SDR-11.

9. Can you please confirm which pump is identified by the notation “AP4*B on Detail 1 of
Sheet 5? There are several models that fall under the AP4+, bottom loading category
[i.e., Leachate, Aggressive Fluids Model, Ultra, etc.].

The Industry Standard AutoPump® AP4+ Bottom Inlet (Long) is acceptable for use on this
project.

10.Is the pump supplier to supply the air inlet and liquid discharge fittings, valve, and
hoses shown on Detail 1 of Drawing #5?

This is up to the contractor (bidder), but ultimately the contractor needs to provide all

fittings, valves, hoses, well caps, liquid level probes, etc. needed for a full installation and to
connect and operate the pump.

SANBORN HEAD

November 23, 2016 Page 3
20161123 Addendum No 2.docx 3066.07

11. Is the low draw down pump shown on Drawing #6 for Manhole #5 existing or are we to
provide it?

The manhole and pump shown on Sheet 6 are existing.

Very truly yours,
SANBORN, HEAD & ASSOCIATES, INC.

Ryan L. Clay,
Project Manager

RLC/ESS:rlc

Attachments: Revised Page 1 of 8 of the Bid Form

cc: Kerry Converse, Jeff Lafleur, Dan Kooken, Kathleen Carragan - City of Nashua

P:\3000s\3066.07\ Source Files\2016 LFG Const\Bidding\Addenda\2\20161123 Addendum No 2.docx

SANBORN HEAD

BID FORM

PROJECT IDENTIFICATION: Spring 2017 Landfill Gas System Expansion
CONTRACT IDENTIFICATION AND NUMBER: IFB0593-113016

THIS BID IS SUBMITTED TO: City of Nashua
Purchasing Department
229 Main Street, City Hall
Nashua, NH 03061-2019

1.01 The undersigned BIDDER proposes and agrees, if this Bid is accepted, to enter into an agreement
with OWNER in the form included in the Bidding Documents to perform all Work as specified or
indicated in the Bidding Documents for the prices and within the times indicated in this Bid and in
accordance with the other terms and conditions of the Bidding Documents.

2.01 BIDDER accepts all of the terms and conditions of the Advertisement or Invitation to Bid and
Instructions to Bidders, including without limitation those dealing with the disposition of Bid security.
The Bid will remain subject to acceptance for 90 days after the day of Bid opening, or for such longer
period of time that Bidder may agree to in writing upon request of OWNER.

3.01 In submitting this Bid, BIDDER represents, as set forth in the Agreement, that:

A. BIDDER has examined and carefully studied the Bidding Documents and the following
Addenda, receipt of all which is hereby acknowledged.

Addendum No. Addendum Date

B. BIDDER has visited the Site and become familiar with and is satisfied as to the general,
local and Site conditions that may affect cost, progress, and performance of the Work.

C. BIDDER is familiar with and is satisfied as to all federal, state and local Laws and
Regulations that may affect cost, progress and performance of the Work.

D. BIDDER has obtained and carefully studied (or assumes responsibility for having done
so) all additional or supplementary examinations, investigations, explorations, tests,
studies and data conceming conditions (surface, subsurface and Underground Facilities)
at or contiguous to the Site which may affect cost, progress, or performance of the Work
or which relate to any aspect of the means, methods, techniques, sequences, and
procedures of construction to be employed by BIDDER, and safety precautions and
programs incident thereto.

lof 8
Bid Form

a) THE CITY OF NASHUA ae

Purchasing Department

November 7, 2016
INVITATION FOR BIDS

Spring 2017 Landfill Gas System Expansion-Four Hills Landfill
Nashua, New Hampshire
IFB0593-113016

The City of Nashua, Division of Public Works, is seeking sealed bids for the work as set forth in the
attached plans and specifications for the expansion of the existing gas collection and control system at the
Four Hills Landfill, 840 West Hollis Street, in Nashua, New Hampshire. The scheduled work consists of
the installation of new horizontal gas collectors and liquid pumping systems in selected vertical wells in
the active Phase I/II expansion landfill.

“Notice to Proceed”, is anticipated to be issued in the Spring of 2017. Completion time for the project
will be calculated, in calendar days, from the date of the issuance of the “Notice to Proceed”, as follows:

90 calendar days for substantial completion
120 calendar days for contract completion

Liquidated damages will be in the amount of $500.00 for each calendar day of delay from the date
established for substantial completion, and $500.00 for each calendar day of delay from the date
established for contract completion.

INSTRUCTION TO BIDDERS:

Bids must be submitted on the bid form in its entirety, in triplicate (one (1) original and two (2) copies)
in a sealed envelope plainly marked “Spring 2017 Landfill Gas System Expansion” and must be
received at Central Purchasing Office, Room 128, 229 Main Street, Nashua, New Hampshire 03060 prior
to 3:00PM, Wednesday, November 30, 2016. Postmarks or other time stamps will not be accepted in
lieu of actual delivery. The contractor can use whatever delivery mechanism it chooses as long as it
remains clear that the contractor is responsible for submissions prior to the date and time. Further details
are available on the City’s web site, www-.nashuanh.gov, under Services; Bid Opportunities; Current
Bids; IFB0593-113016. Bids will be opened in public on the due date and time. Results of the bid
opening will be posted on the City’s web-site, under Services; Bid Opportunities; Current Bids; within
twenty-four (24) hours of the opening. Contract approval will be contingent on approval by the Board of
Public Works, and the Aldermanic Finance Committee.

There will be a MANDATORY pre-bid conference at the Four Hills Landfill, 840 West Hollis
Street, Nashua, NH 03062 at 10:00 AM on Monday, November 14", 2016. The meeting is
an opportunity for the City to overview the project and objectives and participants to request
additional information directly from City staff managing or participating in the project.

A CD of the documents will be available through the Central Purchasing Offices by contacting Dan
Kooken at: kookend@nashuanh.gov

IFB0593-113016 Spring 2017 Landfill Gas System Expansion
229 Main Street « Nashua, New Hampshire O3060 « Phone (603) 589-3330 « Fax (603) 594-3233