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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.

On page 17 of 24 on the 11 x 17 plans, tilted SUMP RISER BUILDING ELEVATIONS
AND SECTIONS, there is a_ written’ section sub-titled Building
Components. Under the Building Components section there is another section
sub-titled Primary/Secondary Pump. An EPG 1 H.P. 220V pump is
specified. Can an equivalent QED pump be approved as equal?

Yes, as long as the QED pump is a functional equivalent to the specified EPG pump.

On drawing 17 of 24, detail 5, Sump Riser Building Piping Isometric drawing,
the secondary riser, primary riser and clean out riser do not have flange
adapters fused to them. On drawing 18 of 24, detail 1 & 3 again show no flange
adapter fused to the end of the pipe or no note describing an 18" flange adapter
or back up ring. The drawings currently state that the flange is made of a 1"
thick piece of HDPE flat stock and cut to the diameter of the 18" HDPE pipe. It
would be more cost effective for the manufacturer of these flanges & The City of
Nashua if these flanges were an off the shelf flange that was traditionally bolted
to a flange adapter & back up ring fused to the leachate and cleanout risers.
Also, a flange adapter fused to the end of each of the three risers would assure a
long term positive connection to the risers. I could see a scenario that after
multiple times of taking the currently drawn flanges off and on, that the holes
could strip and there not be a solid connection to the leachate risers.

Contractors may price the bid item assuming that the detail allows for an off the shelf
flange, bolted to a flange adapter & back up ring fused to the leachate and cleanout
risers. Please note this option in the bid.

I was just wondering how you would like to handle the Nashua Electric control
panel for the primary, secondary, and clean out riser pumps. I don’t have any
kind of ladder logic line drawings to get an estimate on the control panel. Do
you think you will have some kind of print or logic document soon? QED needs
this logic to complete the quote for this project.

A proposed logic document for the proposed control panel will be included in
Addendum #3 that will be posted during the week of February 11, 2019.

Reference: 15210, 2.4; 15210 3.2 C2; Sheet 10, Cleanout Parts List,

Comment: The drawing indicates that epoxy coated 304 fasteners, DI rings and
neoprene gaskets are required. Under Section 15210 High Density Polyethylene
Pipe, Fittings, and Appurtenances Part 2.4, 1/8” thick Viton Gaskets are called
out. In the specs under flange joining carbon steel backing rings and galvanized
nuts and bolts are called out. Stainless steel typically needs no additional
coating. In addition, under Section 15210 Part C-2 and C-4a it is referenced that

SANBORN i HEAD

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.

= Above-grade hardware shall be zinc-plated unless otherwise noted.

= Hot-dipped galvanized fasteners are not allowed.

# 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.

Reference: 15210, 3.2B.12.

Comment: Under Section 15210 Part 3.2 B-12 It is states “all interior butt fusion
weld beads shall be removed from the pipe {i.e., all HDPE pipe must be de
beaded) in accordance with the manufacturer’s recommendations”. Does this
include the debeading of all perforated pipe as well as the solid pipe?

Perforated pipe is not required to be debeaded.
Reference: 4” HDPE Force Main

Comment: Can you clarify the SDR of the force main. By default, it references
SDR 17.

Recommendation: Please clarify force main SDR.

The 4-inch diameter HDPE force main shall be SDR-17.

P:\3000s\3066.09\ Source Files\ Contract Documents\ Contractor Questions\20190206 Addendum Questions.docx

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

(Revised February 2019)
Item . Estimated Bid Unit Prices Extended
No. Construction Items Quantity ($/units) Prices ($)
(w/units)
1 |Mobilization/Demobilization 1 LS LS
2 {Demolition
a. Remove Litter Control Fence 950 LF LF
b. Remove Existing Culverts 1 LS LS
c. Remove and Salvage Existing Riprap 55 cy cY
d. Tree Removal 6.8 AC AC
e. Decommissioning Piezometers 161 LF LF
f. Decommissioning Monitoring Well 104 LF LF
3 |Erosion and Sediment Control
a. Filter Log 1,400 | LF LF
b. Filter Log Inlet Protection 1 EA EA
4 |Grubbing and Topsoil Removal 1 LS LS
5 |Soil Excavation and Placement 97,100 | CY CY
6 |Fill Placement 59,800 | CY CY
7 {Liner System
a. Screened Till
1. From Stockpile 2,500 | CY CY
2. Import 2,245 | CY cY
b. Secondary 60-mil thick, Textured HDPE Geomembrane 28,445 | SY SY
c. Secondary Drainage Geocomposite 28,445 | SY SY
d. Secondary Drainage Sand Layer 1,660 | CY CY
e. Geosynthetic Clay Liner 1,890 | SY SY
f, Primary 60-mil Textured HDPE Geomembrane 28,445 | SY SY
g. Primary Drainage Geocomposite 28,445 | SY SY
h. Primary Drainage Sand Layer 14,225 | CY cY
8 |Landfill Berms and Anchor Trenches
a. Perimeter Berm 1,460 | LF LF
b. Liner Connection Along Phase II Berm 605 LF LF
9 |Leachate Sumps Construction 1 LS LS
10 {Installation of 8-inch Diameter Solid and Perforated HDPE Pipe 4,830 | LF LF
11 {Sump Riser Building 1 LS LS
12 |Electrical Construction 1 LS LS
13 |Controls and Instrumentation 1 LS LS
14 |Leachate Pumping System 1 LS LS
15 | Utility Trench 505 LF LF
16 |Connection to the Phase II Leachate Collection System 1 LS LS
17 |Stormwater Basin
a. Dredging the Existing Portion of the Basin 1 LS LS
b. Remove Portion of Existing Culvert 1 LS LS
c. Low-Permeability Soil 1,070 | CY cY
d. Spillway 1 LS LS
e, Wetland Plantings 1 LS LS
f. Modifying the Existing Discharge Structure 1 LS LS
g. Level Spreader 1 LS LS
18 |Riprap-Lined Swales 205 LF LF
19 |Geomembrane-Lined Swale 435 LF LF
20 |Smartditch-Lined Downchute 210 LF LF

20190110 Schedule of Values-Rev1 xlsx Page 1 of 3 Sanborn Head & Associates, Inc.

27 Locke Road Concord, NH 03301

The H.L. Turner Group Inc.

#: 603.228.1122 hiturner.com

Nashua Riverfront Development Project
Final Engineering Design

5/11/2022
TASK DESCRIPTION WORK HOURS yore
PM Structural PE SrPD tis HOURS
Segment 5 - Multi-Use Path Connector Fas
5.1- Erosion & Scour Determination 8 20 F3 at
TOTAL HOURS 8 0 20 0 2 30
ESTIMATED ENGINEERING COSTS
Work Estimated
Hours Hourly Rate Costs
Project Manager (PM) 8 $5 150.00 $5 1,200.00
Structural Engineer (Structural) i) 5 185.00 $
Project Engineer (PE) 20 §$ 130,00 $ 2,600.00
Sr. Project Designer | (Sr PD) 0 $ 105.00 $ -
Technical Coordinator (TC} 2 §$ 100.00 $ 200.00
| 30 } Total Fully Burdened Labor $ 4,000.00
Subconsultant $ :
Expenses $ 100.00
Estimated Direct Costs 5 — 100.00_
TOTAL ESTIMATED COST= $ 4,100.00

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

Estimated
Construction Items Quantity
(w/units)
Temporary Slope Diversion Swale 670 LF LF
Drain Manhole 1 LS LS
Culverts
a. C-1 (36-inch diameter CPP LS LS
b. C-2 (36-inch diameter CPP LS LS
c. C-3 (18-inch diameter CPP LS LS
d. C-4 (24-inch diameter CPP LS LS
Topsoil and AC AC
Gravel Road SY SY
Extend Groundwater Wells LF LF
Litter Control Fence
a. Install Litter Control Fence LF LF
b. Install New Litter Control Fence LF
Guardrail LF
As-Built Dra LS
Payment Bond LS
Performance Bond LS

Bid Price

Bid Unit Prices Extended
($/units) Prices ($)

20190110 Schedule of Values-Rev1.xlsx Page 2 of 3 Sanborn Head & Associates, Inc.

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.

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=) 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.

ADDENDUM 3 is being issued to respond to submitted questions and provide further clarification.

Please see the attached document for information.

All other aspects of the original document remain the same.
Failure to acknowledge the addendum will result in the bid submittal being disqualified.

Sincerely,

Fons sef

Danielle Greenberg
City of Nashua — Purchasing Agent I!
greenbergd@nashuanh.gov

Addendum #3 received and incorporated into bid submittal for 1FB0593-022019.
Please sign and include this addendum in your bid package.

Yumam Cy

(Authorized Signature) Timothy J. Cady, Director/Program Services

January 19, 2019
(Date)

Charter Contracting Company, LLC
(Name of Firm)

1FB0593-022019 ADDENDUM 3 Page 1 of 1

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.

Please acknowledge receipt of this Addendum in your proposal({s).

CLARIFICATIONS

1. The selected contractor will be required to pay for any installation required by
Eversource to meet the intent of the design. For the purpose of this bid, the contractor
shall provide a suggested installation allowance for this work. This allowance will not
be held against any of the invited bidders during the proposal evaluation phase as the

actual Eversource installation price is unknown at this time.

2. Specification Section 15210 was revised to:

Clarify joint hardware requirements; and

Include a section on pneumatic testing as an alternate to hydrostatic pressure
testing. The revised specification is enclosed.

3. |The pump control panel (CP-1) is to be provided by the selected contractor, not the
City. In regard to panel control logic, notes are provided on Sheet 17 of the Drawings
and are reproduced below:

SANBORN, HBAD & ASSOCIATES, INC.

A float switch shall be in the floor sump. If the float switch is closed due to liquid in
the leachate building, the leachate pumps shall be shut down and visual and remote
alarms shall be activated.

Level sensors shall be installed in the leachate sideslope risers to measure liquid
levels relative to the base of the sump liner. The level sensors shall control the
leachate pump cycles.

www.sanbornhead.com

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.

=» The leachate sump pumps shall shut off when the liquid level is between 3 and 6
inches above the intake of the pump or prior to air infiltration into the pump.

=» A visual alarm shall activate if the liquid level in the primary or secondary sump is
such that a foot or more of head exists on the liner adjacent to the sump (refer to
detail 3 on sheet 16 for location of visual alarm indicators).

= Leachate indications and totalization data shall be made available for programmable
logic controller as indicated in Section 16500 of the project specifications.

Detailed logic control design will be handled during submittal process.

EAG/ESS: eag

Enclosure: Revised Specification (Section 15210)

P:\3000s\3066.09\Source Files\Contract Documents\Addendum #3\Addendum #3.docx

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