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Se) THE CITY OF NASHUA "The Gate City”

Financial Services
Purchasing Department

January 25, 2019

IFB0593-022019
PHASE If! LANDFILL EXPANSION
ADDENDUM #1

information included in this document becomes a part of the original (FB.

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 1 is being issued to provide additional documents and 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,

Danielle Greenberg

City of Nashua — Purchasing Agent It
greenbergd @nashuanh.gov

Addendum #1 received and incorporated into bid submittal for IFB0593-022019.
Please sign and include this addendum in your bid package.

Tina 4 City

(Authorized Signature)

Timothy J. Cady, Director/Program Services

January 19, 2019
(Date)

Charter Contracting Company, LLC
(Name of Firm)

iFBOS93-022019 ADDENDUM 1 Page 1 of 1

Addendum 1

The date for questions to be submitted is being changed from Monday, January 28, 2019 at noon to Friday,

February 1st, 2019 at Noon.

e Please follow this link to the Sahrefile:
httos://sanbornhead.sharefile.com/f/fo7 1e799-23f2-4729-a6c3-Sicaa9b4a3al1

oO

For users who have not used Sharefile before, please enter the email address included on the Pre-Bid
sign-in sheet and use the “forgot password” function. A temporary password will be emailed to you.
From there, the user can setup a personalized password if they wish to do so. If problems occur, please

contact Eddie Galvin at eqalvin@sanbornhead.com.

e itemsin folder include:

e Construction Quality Assurance Plan

e AutoCAD files that include existing and proposed design information

jFB0593-022019 ADDENDUM 1 Page 2 of 2

The H.L. Turner Group Inc.

27 Locka Road Concord, NH 03301

: 603.228.1122 hiturner.com

Nashua Riverfront Development Project
Final Engineering Design

5/11/2022
TASK DESCRIPTION WORK HOURS TOTAL
PM Structural PE Sr PD re HOURS
Segment 3 - Substation Screening
3.1 - Metal Screening Structure 4 24 ed 40 2 70
3.2 - Foundation Design 8 8
Preliminary (completed) 8 36 2 46
Final Design 8 24 2 34
3.3 - Flood Resillency Evaluation 8 74 2 34
i
oll tee Nee Ae hee Re dee Re TT ie
36 84 24 40 8 192
fs ca nes nes sy ETO SED SEED SP ND GND GD Gems mi mth ms ms sys xp Gu cae cme cre cme cm fms cm we oom fen om am cm if nme mess cs os cf ce oe
TOTAL HOURS 36 84 24 40 8 192
ESTIMATED ENGINEERING COSTS
Work Estimated
Hours Hourly Rate Costs
Project Manager (PM) 36 5 150.00 § 5,400.00
Structural Engineer (Structural) 84 § 185.00 § 15,540.00
Project Engineer (PE} 24 $ 130.00 $ 3,120.00
Sr. Project Designer } (Sr PD) 40 $ 105.00 $ 4,200.00
Technical Coordinator {TC) 8 $ 100.00 $ 800.00
192 Total Fully Burdened Labor $ 29,060.00
Geotech Subconsultant $ -
Expenses $ 150.00
Estimated Direct Costs $ 150.00
TOTAL ESTIMATED COST= $ 29,210.00

THE CITY OF NASHUA The Gate City

Financial Services
Purchasing Department

February 7, 2019

iFB0S93-022019
PHASE Ill LANDFILL EXPANSION
ADDENDUM #2

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 2 is being issued to respond to submitted questions.

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,

Baers

Danielle Greenberg
City of Nashua ~ Purchasing Agent Il
greenbergd@nashuanh.gov

Addendum #2 received and incorporated into bid submittal for IFB0593-022019.
Please sign and include this addendum in your bid package.

Tey yt ‘Coy

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

January 19, 2019
(Date)

Charter Contracting Company, LLC
(Name of Firm)

iFB0593-022019 ADDENDUM 2 Page 1 of 7

SANBORN |

| HEAD

Building Trust. Engineering Success.

February 6, 2019
File No. 3066.09

Response to Questions from Bidders (Addendum #2)

1.

Page 4 of 24 of the drawing set entitles “Secondary Base Grading Plan” states,
“Overhead electric to tie into existing power supply located near existing Phase
I-III leachate manhole #1 and secondary witness tank (to be coordinated with
Eversource prior to construction).” Please confirm this work is not part of the
Contract and will be completed by the Owner prior to notice to proceed.

This work is part of the contract and the contractor is responsible for coordinating
with Eversource to bring power to the proposed pump building.

Is a bid bond required? If so, please indicate the percentage that is requested.

A Bid Bond will not be required for this project

Is there an existing SWPPP plan for the site that the Contractor will have to
adhere to?

Yes, there is an existing SWPPP for the site; however, it is specific to landfill activities,
not construction. The contractor is expected to adhere to the stormwater controls
required by the plans and specifications. The selected contractor shall be responsible
for developing a Construction SWPPP.

Contractor is unaware of how the project is funded (General Condition Page 23
of 53, 6.09 Laws and Regulations, D), please provide the appropriate wage rates,
either the Davis-Bacon Prevailing Wage Rates or City of Nashua Prevailing Rates
for Public Works, for the project?

There are no prevailing wage rates for this project.

If the final design report is submitted on July ist, please provide the
appropriate review period a contractor shall assume that it will take NH DEP to
approve the permit and to allow unrestricted access to complete the cell.

A response from NHDES is expected within 30-days of the submission of the
groundwater separation report, which will establish the base grades of the landfill.

Please confirm that the contractor has been provided the most up-to-date pre-
existing conditions survey with the bid documents. Drawing 1 of 24 states that
base map is from 2010.

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

February 6, 2019 Page 2
20190206 Addendum Questions File No. 3066.09

10.

11.

12.

The pre-existing conditions shown on Drawing 1 have not changed substantially since
2010.

Please confirm the boundary line for bid item number 24 topsoil and seeding.
Contractor takeoff is closer to 7 acres.

See attached Topsoil and Seeding Figure and revised Schedule of Values.

Note 1 on detail 2 on sheet 20 of 24 says to line pond 6 and the forebay with 12-
inches of screened till. Please confirm the limits of detention pond 6 and the
forebay to determine the limits of the screened till.

The limit of the forebay and Pond 6 is the elevation 210-foot contour. Pond 6 and its
forebay is estimated to have a surface area of about 28,700 square feet.

Note 1 on detail 2 on sheet 20 of 24 says to remove the sediment within pond 6.
How much sediment is anticipated to be removed from pond 6?

The depth of built up sediment within Pond 6 is unknown. For this bid, the bidders
shall assume removing sediment in the pond that is no more than 12 inches thick.

Please confirm that the secondary sand location on sheet 4 of 24 is accurate.
The secondary sand hatching shown on sheet 4 conflicts with the liner system
details on sheet 11 of 24. Is the 1’ sand layer across the entire cell?

Secondary Sand shall only be placed within areas of the liner system that are sloped at
2 and 4 percent as shown by the limits on Sheet 4 of the Construction Drawings. Areas
of the liner system sloped at 10 percent and 2(H):1(V) do not require Secondary Sand.

Please provide the as-built plans for the existing litter control fence so that
contractor can appropriately bid the removal and re-installation.

See the attached Structure As-built Plan, dated 3/31/2009 for the location of the litter
fence, and the description of the litter fence installation in the Phase II landfill QA/QC
report. Field measurements confirm that the posts are spaced 50 feet on center.

For bid Item #16, shall the contractor anticipate coming into contact with
leachate or will the leachate within the cell be pumped down to complete the
work?

It is not anticipated that the contractor will encounter leachate in making connections
to the Phase II leachate collection system. However, the contractor must take
appropriate worker safety measures while performing the work in case leachate
and/or landfill gas is encountered.

SANBORN il HEAD

February 6, 2019 Page 3
20190206 Addendum Questions File No. 3066.09

13.

14.

15,

16.

17.

18.

19,

At the pre-construction meeting, it was discussed that stumps and roots from
the clearing and grubbing would remain onsite. Please confirm the location
where the contractor shall stockpile stumps for further use by the Owner.

An area to stockpile stumps and roots will be available in the vicinity of the compost
windrows on the northeastern portion of the site.

Please designate the area where all topsoil shall be stockpiled as described in
02100 - 3.1E.

An area to stockpile topsoil will be available in the vicinity of the compost windrows
on the northeastern portion of the site.

If there is an under-run of topsoil (when comparing the stripped area to the
placement area) can the Contractor utilize the topsoil from the composting area
onsite?

The City utilizes the compost for daily landfill cover and other City projects. It is
therefore not available to supplement topsoil for this project.

At the pre-construction meeting, it was noted that a large stockpile of material
(potentially clay) was in the middle of the Phase III area. Is this material
included on the existing conditions plan?

The stockpiled soil material is more adjacent to the landfill footprint, rather than in it.
It is located within the proposed slope on the eastern side of the Phase III] footprint.
For this bid, the contractor shall assume that 2,500 CY of Screened Till is available
within this area and the remaining Screened Till required to complete the project
needs to be imported. The attached Schedule of Values was updated accordingly.

Is there any physical testing of the clay material onsite?

There is no physical testing data for the on-site clay material. For this bid, contractors
shall assume it is suitable for use as Screened Till.

At the pre-construction meeting, it was noted that the selected contractor would
have to handle and transport stockpiled debris and oversized rocks located
within the Phase III limits. Where shall the contractor move this material? How
does the contractor get paid to move this material? Is there an estimated
volume?

Stockpiled debris and rocks can be moved to a designated area on the northeast
portion of the site. There is no estimated volume for this material. Payment for this
work is covered under Bid Item #4, Grubbing and Topsoil Removal.

Specification section 02200, 3.6D states, “Subgrade for geosynthetic placement
shall be proof-rolled by at least (4) passes of a 10,000-pound vibratory, smooth-

SANBORN il HEAD

February 6, 2019 Page 4
20190206 Addendum Questions File No. 3066.09

20.

21.

22.

23.

24.

25.

drum roller to demonstrate strength.” This is will not be possible along the
slopes for safety issues, can contractor plan to smooth screened till area with an
excavator bucket if compaction is met?

The City encourages the bidders to consider using construction methods and
equipment capable of meeting the design intent. Alternative means of compaction
may be presented in the bid and will be considered by the City provided there is
sufficient justification/documentation for its use and ability to meet the intent of the
design.

Does the Owner have an Environmental Monitor that is familiar with the site or
has been previously been utilized onsite?

The City typically does not use an Environmental Monitor for landfill construction
projects. However, the City will retain an engineering firm familiar with the site to
provide construction quality assurance services during construction.

Who is the professional survey company that is utilized by the Owner?

There are several professional survey companies who have previously worked on the
Four Hills site. They include, but are not limited to Hayner/Swanson, Inc. and WSP
USA, Inc., both located in Nashua, NH.

Can HDPE piping be tested with air in lieu of hydrostatic testing?

Yes, air testing is acceptable. Specification 15210 will be revised to include air testing
requirements and will be included in Addendum #3.

Is there a power drop where contractor is to locate the construction trailer?

There is a power drop with a meter and circuit breaker panel used by previous
construction trailers located along the main haul road adjacent to retention pond #2.
The power drop has not been used in several years; therefore, the City does not
guarantee the viability of the power drop. The contractor is free to evaluate alternate
locations for the construction trailer and power connection if this location is not
convenient.

Where can contractor fill water truck for dust control?

There two hydrants near the landfill office building that are available for filling a
water truck.

Please confirm the unit for 27B is LF and not LS.

The unit for 27B is LF. See the attached revised Schedule of Values.

SANBORN i HEAD

February 6, 2019 Page 5
20190206 Addendum Questions File No. 3066.09

26.

27.

28.

29.

30.

31.

32.

33.

34.

For Alternate bid Item A27, is the contractor to setup/install the portable litter
fence?

If there are components of the portable fence to be installed or set-up, then yes. The
portable fences should be delivered directly to the landfill face ready to use.

Detail 4 on sheet 21 shows some dimensions for the drain manhole. Please
provide additional information about the drain manhole including the rim, inlet
and outlet elevations. The size of the structure in the detail does not have the
height of the structure.

Inlet and outlet elevations are included in the culvert schedule for C-1 and C-2 on
Sheet 21 of the Construction Drawings. The rim elevation shall be 229.0 feet and the
total interior height of the structure shall be a minimum of 5 feet.

Detail 2 on sheet 12 of 24 shows the 31” mid-splice beam guardrail. The detail
does not show what should be on the end for the guardrail NHDOT typically
requires terminal end anchorages or MASH tangent end treatments. Are one of
these to be used?

The contractor shall install Type G-2 terminal units for proposed guardrail.

Bid Item 7 section H: states Furnishing and placing drainage sand to construct
interim stormwater berms is incidental to this bid item but it does not appear
on any of the drawings?

There are no interim stormwater berms proposed as part of this work.

There is no survey specification included. Can contractor perform their own
survey?

Yes.

Does the geomembrane panel drawing need to be stamped by a PLS?

No.

On previous projects, have contractors screened the till from an onsite source?
Refer to question #16.

Is it the intent of the contract to import the screened till?

The intent is to utilize on-site soils. The contractor shall import soil as necessary.
Refer to question #16.

What size diameter are the PVC wells to be decommissioned and the wells to be
extended?

SANBORN i HEAD

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

35.

36.

37.

38.

39.

40.

The boring/well logs for the wells to be decommissioned are attached. PVC well
casing diameters for the wells to be raised are as follows:

Wells MW-110S & R= 2” diameter;
Wells MW-111S & R = 1.5” diameter; and,
Well B-4 = 1.5” diameter.

Please provide a detail on how the wells are to be extended.

The NHDES does not provide guidance related to well extensions, however, standard
construction practices would still apply to the materials used for the extended wells
(i.e., no glues or solvents, use of lockable cap, maintain seal at surface, etc.). Attached
is a schematic provided by NHDES. The contractor would be required to remove
existing surface completion components and extend the existing PVC pipe without the
use of glues or solvents. Contractor can use a variety of couplings including, but not
limited to, slip couplings, Fernco flexible couplings, or compression couplings. Soil
placement around the extended PVC pipe shall be performed with care and typical
surface completion components shall be installed at the proposed finish grade.

Please confirm the portable litter fence shall be 50’ lengths. Manufacturer said
that the fence comes in 40’ lengths.

Either 40-foot or 50-foot lengths for the portable litter fence are acceptable.

Page 3 of the Bid Form Section 8.01 (B) refers to “Bid Bond”. Will a bid bond be
required? If so, will a form be provided? What will be the required percentage?

A Bid Bond will not be required for this project.

Can boring/drilling logs be provided for the existing monitoring wells and
piezometers that need to be decommissioned?

Yes, the boring/drilling logs for the wells and piezometers to be decommissioned are
attached.

The bid item definition for Item 7h-Primary Drainage Sand, spec. sheet 38 of
255, states that furnishing and installing of drainage sand for interim
stormwater berms is incidental to the item. Where are the stormwater berms
called out? Can you please provide a detail for the berms?

There are no interim stormwater berms proposed as part of this work.

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, a Sparling Instrument
656 Tigermag flanged magnetic flow meter is specified. Can a flanged 2 inch
Badger Magnetic Flow Meter, M2000 be substituted?

SANBORN i HEAD