Agenda

SECTION 15210

HIGH-DENSITY POLYETHYLENE
PIPE, FITTINGS, AND APPURTENANCES

PART 1 - GENERAL
1.1 SCOPE OF WORK

A. Supply and install high-density polyethylene (HDPE) pipe, fittings, and
appurtenance for the leachate collection and conveyance systems.

1.2 SUBMITTALS

A. CONTRACTOR shall submit to ENGINEER the following:

1. Manufacturing data listing resin type, cell classification, stock density,
melt flow, flexural modulus, tensile strength, and coloration.

February 11, 2019 Page 2
| Addendum #3Addendum#3.doex 3066.09

» The electrically actuated ball valve shall be normally closed. The valve should only
open when the primary leachate pump is disabled and the secondary leachate pump
is activated.

=» The primary and secondary sump pumps shall be set to start when the liquid in the
respective sump is at a level less than or equal to the respective liner elevation at
the upper edge of the sump.

SANBORN ||

To:

From:

File:
Date:
Re:

cc:

| HEAD

Building Trust. Engineering Success.

MEMORANDUM

Invited Bidders

Edward A. Galvin, P.E.
Eric S. Steinhauser, P.E., CPESC, CPSWQ

3066.09
February 11, 2019

Addendum #3

Phase III Construction
Four Hill Landfill
Nashua, New Hampshire

Jeff LaFleur, City of Nashua
Kerry Converse, City of Nashua

This addendum shall be part of the Contract Documents for the above-referenced project.

=) THE CITY OF NASHUA “The Gate City’

Financial Services
Purchasing Department

February 13, 2019

IFBOS93-022019
PHASE II] LANDFILL EXPANSION
ADDENDUM #3

Information included in this document becomes a part of the original IFB.

if you are submitting a paper bid, please sign below to indicate receipt of this additional information and include this
page with your bid submittal. If you are submitting a bid via Bid Express please be sure to acknowledge the addendum
on the website before submitting your bid.

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Schedule of Values - Alternate Bid Items
Phase III Construction - Stage |

Four Hills Landfill
Nashua, New Hampshire
(Revised February 2019)
Alt. Bid Construction Items Estimated Quantity}! Bid Unit Prices Extended
Item No. onstt (w/units) ($/units) Prices ($)
A7 _ {Leak Detection Survey 1 LS LS
A24__|Screening Vegetation 1 LS LS
A27__|Portable Litter Fence 4 EA EA
Bid Price

20190110 Schedule of Values-Rev1 xlsx Page 3 of 3 Sanborn Head & Associates. Inc.

Schedule of Values - Bid Items
Phase III Construction - Stage |
Four Hills Landfill
Nashua, New Hampshire
(Revised February 2019)

Schedule of Values - Bid Items
Phase III Construction - Stage |
Four Hills Landfill
Nashua, New Hampshire

February 6, 2019 Page 8
20190206 Addendum Questions _ File No. 3066.09

45.

46.

below ground backup rings are to be made of Carbon Steel while above grade
backup rings are to be made of Zinc-plated steel.

Recommendation: Please clarify backup ring, gasket, and hardware
requirements.

A revised specification will be included in Addendum #3 during the week of February
11, 2019. Please prepare bids as follows:

u All gaskets shall be Viton.

= Below-grade joint hardware shall be Type 304 stainless steel.

February 6, 2019 Page 7
20190206 Addendum Questions File No. 3066.09

41.

42.

43.

44.

Yes, as long as the Badger flow meter is a functional equivalent to the specified
Tigermag flow meter.