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November 12, 2019
20191112 Budget Increase Letter.docx

Page 3

a Update the facility's operating, closure, and financial assurance plans to satisfy permit
conditions; and

u Prepare the CQA Report and Record Drawings for submittal to the NHDES.

Budget Adjustment

The original budget for each task under this scope of services is provided in the table below
along with the proposed adjusted budget that we believe is required to finish out the
Construction Quality Assurance Services project. The proposed adjusted budget is based on
the estimated time commitment required to complete the remaining services described
above in addition to expenses associated with material conformance testing, printing,
mileage, and tolls.

Original Proposed | Proposed
Task Task Description B Budget Adjusted
udget
Increase Budget
1 CQA Services $217,500 $75,500 $293,000
Out of Scope Items & Schedule Extension - $60,500 :
Remaining Field Services - $15,000 -
2 Construction Meetings/Documentation $17,500 $4,200 $21,700
3 | CQA Report $20,000 - $20,000
4 Permit Conditions Support - $10,000 $10,000
Total | $255,000 $89,700 $344,700

Based on our discussions with the City, Task 4 was added to separate out the proposed costs
to prepare the documents associated with the Phase III permit conditions that will be
submitted to the NHDES prior to the Notice of Intent to Operate application. We are not
including the cost to prepare the Financial Assurance Update as that was already budgeted
to be completed under our General Engineering Services agreement.

Acceptance

We understand that acceptance of this budget adjustment will be provided in a City issued
Purchase Order to Sanborn Head for these services.

SANBORN i HEAD

November 12, 2019 Page 4
20191112 Budget increase Letter.docx

Thank you for the opportunity to be of continued service to the City. We look forward to
working with you on this project. Please contact us should you require additional
information.

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

Upeuru U4. rab a S Frackasetn

Edward A. Galvin, P.E. Eric S. Steinhauser, P.E., CPESC, CPSWQ
Project Manager Senior Vice President and Principal
EAG/ESS:eag

Enclosure: Latest contractor construction schedule

P:\3000s\3066,18\ Project Contral\Budget Increase\20191112 Budget Increase Letter.docx

SANBORN i HEAD

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CHANGE ORDER

No. 2
PROJECT: Phase III Landfill Expansion
OWNER’S CONTRACT NO: IFB0593-022019
EXECUTED CONTRACT DATE: April 14, 2018

DATE OF ISSUANCE: January 16, 2020 EFFECTIVE DATE: Upon City Approval
OWNER: City of Nashua, NH

OWNER’s Purchase Order NO.: 148117

CONTRACTOR: Charter Contracting

ENGINEER: Sanborn Head Associates

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

Description:

Charter’s Change Order #2 consists of two parts — quantity changes and an out-of-scope work item.
Charter’s cost summary, which includes their final contract price, is provided as Exhibit 1. Charter
provided additional information for the out-of-scope work item (Exhibit 2). Subsequently, and as part
of resolving material quantity changes, as-built survey information was provided by Charter to backup
quantity changes presented in Change Order #2.

Attachment:

Sanborn Head letter, issued December 13, 2019 — Review of Contractor Change Order Request

Change Order #2 1 of 2
Phase III Landfill Expansion

Summary

CHANGE IN CONTRACT PRICE:
Original Contract Price

$5,525,525.00

CHANGE IN CONTRACT TIMES:
Original Contract Times

Substantial completion: January 1, 2020
Ready for final payment: February 10, 2020

Net changes from previous Change Orders

$175,000.00

Net change from previous Change Orders

NONE

Contract Price prior to this Change Order

$5,700,525.00

Contract Times prior to this Change Order

Substantial completion: January 1, 2020
Ready for final payment: February 10, 2020

Net Increase (deerease} of this Change Order

$191,271.44

Net Increase (deerease)} of this Change Order

NONE

Contract Price with all approved Change Orders

Contract Times with all approved Change Orders

$5,891,796.44 Substantial completion: January 1, 2020
Ready for final payment: February 10, 2020
RECOMMENDED: ACCEPTED: APPROVED:
By: By: By:
DPW Representative Contractor Mayor James W. Donchess
(Authorized Signature) (Authorized Signature) Owner
(Authorized Signature)
Date: Date: Date:
Change Order #2 2 of 2

Phase II Landfill Expansion

SANBORN li HEAD

20 Foundry Street
i Building Trust. Engineering Success. Concord, NH 03301
Mr. Jeff Lafleur December 13, 2019
Superintendent File No. 3066.18
Nashua Division of Public Works, Solid Waste Department
840 West Hollis Street

Nashua, NH 03062

Re: | Review of Contractor Change Order Request from Charter Contracting Company LLC
Phase III Construction Project
Four Hills Landfill
Nashua, New Hampshire

Dear Jeff:

On November 27, 2019, Charter Contracting Company LLC (Charter) submitted their second
request (Change Order #2) for a change order for the Phase III Construction Project. As you
are aware, the City of Nashua (City) issued a $175,000 change order (Change Order #1) on
September 3, 2019 that was accepted by Charter on October 9, 2019. As requested by the
City, Sanborn, Head & Associates, Inc. (Sanborn Head) reviewed Charter’s Change Order #2,
provided backup information, and discussed the change order request items with
representatives of Charter.

This letter, prepared as required by Section 10.05 of the General Conditions of the Contract
between the City and Charter, summarizes Sanborn Head’s review of the change order
request.

CHANGE ORDER REQUEST

Charter’s Change Order #2 consists of two parts — quantity changes and an out-of-scope
work item. Charter’s cost summary, which includes their final contract price, is provided as
Exhibit 1. Charter provided additional information for the out-of-scope work item (Exhibit
2). Subsequently, and as part of resolving material quantity changes, as-built survey
information was provided by Charter to backup quantity changes presented in Change Order
#2.

The following addresses each of the Change Order #2 items as it is known as of the date of
this letter. Sanborn Head recognizes that increases to the contract value will increase
Charter’s performance bond. As such, for this review, bond increases will not be considered
on an individual pay item basis as sometimes presented in the enclosed exhibits. Rather, a
1.5 percent allowance for the performance bond will be added to the total contract increase,
if any. Also, as agreed upon during our review of Change Order #1, Charter’s rates were
assumed to be fully loaded, therefore any charged “overhead” was ignored.

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

December 13, 2019 Page 2
20191213 Change Order Review Letter.docx 3066.18

Over/Under Quantities

As explained in our Change Order #1 review letter, dated September 26, 2019, the latest
Type If Permit Modification Application included several design changes needed to
demonstrate that the project conforms to the groundwater separation requirement of the
New Hampshire Solid Waste Rules (Rules). The design changes primarily affected earthwork
volumes and leachate collection system (LCS) piping quantities. Because Charter achieved
substantial completion of Phase III, there is now sufficient as-built survey available to finalize
the Phase III quantities.

Sanborn Head reviewed Charter’s quantities and their computer-generated surface used to
calculate their updated quantities. During our review, we identified that Charter was
accounting for geosynthetic material installed beyond the limit of waste containment area.
After discussing with Charter, and reviewing the Phase III bid item definitions, it was agreed
that geosynthetic material installed beyond the limit of waste containment area should be
neglected.

Based on the discussion included in our Change Order #1 review letter related to the LCS
piping (Section 8}, it was agreed upon that the design changes warranted a unit price
increase of $9.81 per foot ofipipe. The surveyed length of LCS piping installed varied slightly
from the estimated value. The lump sum cost provided by Charter for the additional pipe,
stone, and labor associated with the design changes did not correlate with the $9.81 per foot
cost previously agreed upon. After discussing with Charter, it was agreed that the lump sum
amount provided by Charter should be reduced based on the $9.81 per foot cost previously
agreed upon.

Out of Scope Work Item — Building Generator Update

In accordance with Condition 18 of the City’s Phase III permit, the City needs to ensure the
availability of auxiliary power pursuant to Env 805.06(n) and (0). Because the original sump
riser building electrical system design did not provide the City the ability to operate via an
auxiliary power source (i.e., a generator}, Sanborn Head and Charter worked to modify the
existing design in order to be compliant with the Rules. The modifications included
rearranging panel equipment and furnishing and installation of anew NEMA rated electrical
switch gear to allow the City-owned emergency generators to be connected and operate the
sump riser building mechanical components.

During a recent site walk-through with Sanborn Head, Charter indicated that a portion of the
PVC piping was proposed to be heat-traced. It was agreed upon that all of the PVC piping and
valving within the sump riser building should be heat traced for protection against freezing.
As such, Charter includes the additional labor and material costs associated with adding the
additional heat-tracing.

As documented in Exhibit 2, Charter’s cost of $9,312.00 does not included overhead costs,
thus it is recommended that the cost for this item be paid in full.

SANBORN I HEAD

December 13, 2019 Page 3
20191213 Change Order Review Letter.docx 3066.18

CHANGE ORDER SUMMARY

Sanborn Head summarized the change order information in Table 1. When reviewing the
table, please note that where change order items are specific to a Contract quantity or unit
rate, those quantities and unit rates were adjusted accordingly. For items not specific to a
Contract quantity or unit rate, those items are considered stand alone and are represented
as such. Also, an allowance for the Performance Bond is added as the last entry and reflects
an additional cost equal to 1.5 percent of the total cost increase.

Table 1 presents a summary of the cost changes discussed above, which reflects a Total
Contract Increase of $366,271.44. Sanborn Head understands that the City issued one change
order in the amount of $175,000, and that another change order of $191,274.44 will need to
be issued to Charter.

As requested, the City also asked Sanborn Head to provide a change order for our services
associated with the additional requirements imparted by the New Hampshire Department
of Environmental Services and the associated construction delays. Our change order totaling
$89,700 is included as Exhibit 3.

CLOSING

Sanborn Head appreciates the opportunity to be of continued service to the City of Nashua.
Please contact either of the undersigned should you require additional information.

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

Edward A. Galvin, PE Eric S. Steinhauser, PE, CPESC, CPSWQ
Project Manager Senior Vice President

ESS/EAG:ess

Table 1 Summary of Contract Cost Changes

Exhibits: { - Final Contract Price (Charter)
2 - Generator Connection backup information (Charter)
3 - Budget Increase Letter (Sanborn Head)

Copy to: Kerry Converse, City of Nashua

P:\3000s\3066.18\Source Files\Contractor Change Order Request\CO#2\20191213 Change Order Review Letter.dacx

SANBORN I HEAD

Fable 1 Suscary of Contract Changesxix

Construction items

TABLE 1
Summary of Contract Changes
Phase IL] Construction Project
Four Hills Landfill
Nashua, New Hampshire
(Change Order #2)

. , Contract Unie , Revised Revised Unit Rate Revised Contract
Unit | Quantity Rate Contract Price Quantity (Over/Under} Contract Price

Page 1 of 2

Sanborn Head & Associates, Inc.

Fable 1 Summary cf Contract Chanyesaba:

Construction Items

TABLE 1
Summary of Contract Changes
Phase II] Construction Project
Four Hills Landfill
Nashua, New Hampshire
(Change Order #2)

t Unit . Revised Revised Unit Rate Revised Contract
Unit | Quantity Contract Uni Contract Price " . Contract "

Rate Quantity (Over/Under) Price

Page 2 of 2

Sanborn Head & Associates, Inc.