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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.

EXHIBIT 1

CONTRACT QUANTITY OVER/UNDER RUNS

. a .,) Contract} Contract Contract Totat [Projected Final Unit Price ‘ Projected Final

Item No. Bid Item Description Unit Quantity] Unit Price Price Quantity Over/Under Contract Changes Tatal Price
1 Mob/Demob Ls 1.00 | $500,000.00 | $ 590,000.00 1,00 $ - $ - $500,000.00
2a Remove Litter Fence LF | 956.00 | $ 31.06 | $ 29,450 00 950.00 $ - $ - $ 29,450.00
2b Remove Culverts LS 1.00 $ 1,200.00 | $ 1,200.00 1.00 $ - $ - $3 1,200.00
2c {R&S Existing Riprap CY] $5.00 |$ 30.00 | $ 1,650.00 55.00 $ - $ - $ 1,650.00
2d ‘Tree Removal AC] 680 | $ 9,000.00] $ 61,200.00 $ - $ - $ 61,200.00
2c Decom. Piczometers LF} 161.00 | $ 52.00 | $ 8,372.00 $24 $ 988.00 | $ - $ 9,360.00
Decom Monitoring Well LF J 104.00 | $ 44.00 | $ 4.57600 $_(1,936,00)| $ - $ 2,640.00
Filter Log, LF | 1,400.00 | $ 33.00 | $ 46,200.00 1,400.00 $ - $ - $ 46,200.00
3b Filter Log, Inlet Pratection EA 1,00 $ 500.00 | $ 500.00 Loo $ - $ - $ 500.00
4 Gnubbing and Topsoil Removal LS 1.00 | S$£15.000.00 | $ 115,000.00 1.06 $ - $ “ $__115,000.00
5 Soit Excavation and Placement CY 797,100 00] $ 6.75 | $ 655,425.00 }-. 69,680.00 =| $ (185,085.00)} $ - $ 470,340.00
6 Fill Placement CY [59,800.00] $ 24.00 | $__1.435,200.00 Ff. $ _(3,792.00)| $ - $_1,431,408.00

Tal Screened Till - Fram Stockpile CY | 2,500.00 | $ 2000 | $ 350,000 00 $ (50,000.00)} $ - $ -
Taz Screened Till - From Import CY | 2,245.00 | $ 40.00 | $ 89,800.00 $ 112,360.00 | $ “ $ 202,160.00
7b {Secondary 60m HDPE Membrane SY 428,445.00] $ $00|$ 142,225.00 $ - $ . $142,225.00
Fe _|Secondary Drainage Compasi SY _§28.445.00] $ 5.80] $ 164,981.00 $ - 5 - $164,981.00
7d__ {Secondary Drainage Sand layer CY 71,660.00 | $ 35,00 | $ 58,100.00 $39,165.00 | $ : $ 97,265.00
Te Gcosynthetic Clay Liner SY § 1,890.00 | $ 9.00 | $ 17,010.00 $ 3,492.00 | $ - $ 20,502.00
7f {Primary 60m HDPE Membrane SY $28,445.00; $ 5.00 | $ 142,225.00 28,445.00 $ - $ - | $142,225.00
Jy {Primary Drainaze Composite SY $28,445.00} $ 580[$ 164,981.00] 28,445.00 $ - $ = $164,981.00
Th__| Primary Drainage Sand Layer CY $14,225.00} $ 26.00 | $ 369,850.00 ko aaeeag a) §$ 5,252.00 | $ - $ 375,102.00
$a Perimeter Berm LF § 1,460.00 | $ 60.00 | $ 87,600.00 1,460.00 $ “ 3 * $ 87,600.00
8b Liner Connection Phase II Berm LF § 605.00 | $ 21.00 | $ 12,705.00 605.00 $ - $ - $ 12,705.00
9 Leachate Sumps Construction Ls 1.00 $ 95,900.00 | $ 95,000.00 1.00 $ - $ - $ 95,006.00
10 | F&I 8in Solid and Perl. HDPE Pipe LF § 4,830.00 | $ 50.00 | $ 241,500.00 fe seine | S$ 49,250.00 | $ . $ 290,750.00
il Sump Riser Building LS 1.00 | $100,000.00} $ 100,000.00 1.00 $ ” $ . $ 100,000.00
12 Electrical Construction LS 1.00 | $ $5,000.00; $ 85,000.00 1.00 $ ” $ - $ 85,000.00
13. |Contrals and Instr ion LS 1.00 | $ 45,000.00; $ 45,000.00 1.00 $ - $ -_|$ 45,000 00
14 Leachate Pumping System eS 1.00 $ 60,006.00 } $ 60,600.66 1.00 $ - $ - $ 60,006,00
15 Utility Trench LF | 505.00 | $ 75.00 | $ 37,875.00 505.00 $ “ 3 - $ 37,875.00
16 _|Connect to Phase 1f Leachate System LS 1.00 | $ 75,006,00 | $ 75,000.00 1,00 $ “ $ . $ 75,000.00
17a__| Dredging Basin LS 1.00 | $ 7,500.00 ]$ 7,500.00 1.00 $ - $ -_{s 7,500.00
17b__ | Remove Basin Culvert LS 100 | $ 1,100.00} $ 1,100.00 1.00 $ - $ - {S$ 1,106.00
l7¢ }Low-Perm. Soit CY | 1,070.00 | $ 30.00 | $ 32,100.00 1,070.00 $ - $ - $ 32,100.00
17d {Spillway LS 1.00 $ 4,000.00 | $ 4,000,00 1,00 $ - $ - $ 4,000.00
17e | Wettand Planting LS 100 | $ 3,500.00 | $ 3,560.00 1.00 $ - $ - $ 3,500.00
17f | Madify Discharge Sirueture LS 1.00 | $ 2,500.00] $ 2,500.00 1.00 $ - $ - $ 2,500.00
17g | Level Spreader LS 100 | $ 1,500.00 | $ 1,500.00 1.00 $ - $ - $ 1,500.06
18 _ | Riprap-Lined Swales LF | 205.00 | $ 45.00 | $ 9225.00 205.00 $ - $ - $ 9,225.06
19 Geomembranc-Lined Swale LFW 435.00 | $ 33.00 | $ 14,355.00 435.00 $ - $ : $ 14,355.00

20 _|Smartditch-Lined Downchute LF] 21000 | $ — #20.00|$ 25,200.00 $ _(25,200.00}| $ : $ -
21 Temp. Slope Diversion Swate LF | 676.00 |} $ 30,00 | $ 26, 106,06 $ 4,506.00 | $ - $ 24,600.00
22 Drain Manhole LS 1,00 $ 4,000.00 | $ 4,000,060 $ - $ “ $ 4,000.00
23a __|C-1 (36in CPP} LS 1.00 | $ 9,000.00} $ 9,000.00 $ - $ - $ 9,000.00
23h [C-2 (36in CPP) LS (00 {| $ 4,500.00 | $ 4,500.00 $ : $ : $ 4,500.00
23c —{C-3 (18in CPP) LS Loo $$ 3,000.00] $ 3,000.00 $ - § - $ 3,000.00
23d C4 (24in CPP) LS £00 $ 7,500.00 | $ 7,500.00 $ - $ - $ 7,500.00
24 __| Topsoil and Seeding AC] 5.27. | $ 9,000.00 | $ 47,430.00 5.27 $ : $ : $ 47,430.00
25 {Gravel Road SY § 7,830,00] $ 13.00} $ —_1G1,796,00 7,830.00 $ - $ - $ 101,790.00
26 Extend Groundwater Wells LF §€ 40.00 | § 80,00 | $ 3,200.00 40,00 $ . $ - $ 3,200.00
27a __{ Install Existing Litter Control Fence LF § 950.00 | $ 50.00 | $ 47,500.00 950.00 $ - $ - $ 47,500.00
27b__|Install New Litter Control Fence LS} Gt0.00 |S 125.00} $ 76,250.00 610.00 $ - $ . $ 76,250.00
28 [Guardrail LF ¥ 450.00 | $ 37.00 | $ 16,650.00 450.00 $ - $ - s 16,650.00
29 _{As-Built Drawings LS 100 | $ 10,000.00} $ $0,000.00 3.00 $ - $ - $s 10,000.00
30 Paynicot Bond LS 1.00 $ 22,500.00 | $ 22,500.00 1,00 $ - $ - $ 22,506.00
31 Performance Bond LS 1.00 $ 22,506.00 | $ 22,500.00 1,00 $ - $ - $ 22,500.00
A7__|Leak Detection Survey LS 1.00 | $ 25,000.00 | $ 25,060.00 1.00 $ - $ - |$ 25,000.00
A24__ [Screening Vegetation LS 1.00 | $ 30,000.00 | $ 30,000.00 1,00 $ . s : $ 30,000.00
A27__|Portable Litter Fence EA 4.00 $ 19,000.00 | $ 76,000.00 400 $ - $ - $ 76,000 00
I Relocate Screened Till LS 1.00 $ 14,255.23 | $ - 1,00 $ : $ 14,255.23 | $ 14,255.23
2 Erosion Contro! Blankets on Slope (50%) LS 1,60 $ 22,764.00 | $ - 1,00 $ - $ 22,764,00 | $ 22,764.00
3 IP Trench Decommission LS 1.00 | $ 4,535.72 | $ : 100 $ : $ 4,535.72 | § 4,535 72
4 Landfill Celi Re-Grading / Contour Changes LS 1.00 | $ 40,188.25 | $ : 1 00 $ : $ 40,188.25 | $ 40,188.25
5 Indirect Delay Costs LS 100 | $ 93,256 85 | $ : 1.00 $ : $ 93,256.85 1 $ 93,256.85
6 Leachate Building Changes LS 100 | $ 656937] $ - {.00 $ > $ 6,569.37 | $ 6,569.37
7 Roadway Material Credit SY [7,830.00 | $ {2.95)| $ - 7,830.00 § : $ (23,098.50}] S$ _ (23,098.50)
& Erasion Control Blankets on Slope (Remaind LS 100 [| $ 19,236.00] $ - 1.00 $ - $ 19,236.00 | $ 19,236.00
9 Utility Installed Electrical Service Ls 1.00 | $ 25,000.00 | $ - 1.00 $ - $ 25,000.00 | $ 25,600.00
10 |F&J Sin Solid and Perf HDPE Pipe LS 4.00 | $ 57,045,15| $ - 1.00 $ - $ 57,045.15 | $ 57,045.15
11 Revised Geosynthetics Pricing LS 100} $118,542.32 | $ - 1.00 § - $ 148,542.32 | $ 118,542.32
12 Phase II Fic-in LS 100 | $ 24,258.17 | $ - 1.¢0 $ - $ 24,258.17 | $ 24,258.17
13 Building Gencrator Update LS E00 {S$ 931200) $ - E00 $ - $ 9,342.00 | $ 9,342.00
14 Increase to Bond LS p00) |S 5.412.885 - 1.00 $ - $ 5.412.88 | $ 5.412.838
S$ 5,525,525,00 S$ _(51,006.00)} $ 417,277.44 | S$ _5,891,796.44
Total ContractIncrease |S 366,271.44
Change Order #1 |S 175,000.00
Change Order #2 |S 191,271.44

EXHIBIT 2

Nashua Landfill - Phase tl Cell Expansion
PCO #2-1755
Generator Connection

MATERIAL
TOTAL
DESCRIPTION HOURS RATE AMOUNT
373.85
251.37
222.60
38.88
152.03
137.89
412.87
78.54

LABOR CLASS RATE AMOUNT DESCRIPTION UNITS| UNIT PRICE] AMOUNT
48.75 $95.00

«Komatsu PC360
~ Komatsu PC300HD
> Komatsu WA470
- 950
- WA380
- Komatsu WA320
Truck - HM4c0
Truck - Komatsu HM300
- Komatsu D6S
. 06
- cs-
Add - GPS
Add - GPS
Rover

a

82.75
FOREMAN - ST 94.25
- OT
-ST $9.75
- OT 81.50
TOR - ST 79.75
TOR - OT

DOl/O/Os/OjIO|o

223.33
158.52
187.85
170.41

O/Ol[OpoOl[oJo/o/al[o

AL
TAX @ 0.00%
‘AL DIRECT LABOR AL MATERIAL COSTS

SUBCONTRACTOR ITEMS TOTALS
HRS | RATE AMOUNT DESCRIPTION UNITS] UNIT PRICE | AMOUNT
Proulx 1,00| LS 7. 7, TOTAL LABOR COSTS $ 595.00

TOTAL MATERIAL COSTS $ -
TOTAL EQUIPMENT COSTS $ -

TOTAL SUBCONTRACTOR COSTS $ 7,580.00

SUBTOTAL OF ALL COSTS $ 8,175.00

FEE @ MAT/SUB 15.00% $1,137.00

OVERREAD @ SUBTOTAL 0.00% $ :

BOND @ (ADDED LATER) 0.00% $ :

AL SUBCONTRACTORS COSTS TOTAL EXTRAWORK AMOUNT $ 9,312.00