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Exhibit A Scope of Work

The scope of this LTSA includes all parts, materials, equipment, consumables, and labor necessary
to complete all tasks in the scope of work this will ensure the safe and reliable operation of
the PGE.

Schedule Maintenance
Engine/ generator:

Planned Cogen maintenance (includes parts, labor, travel and freight) in accordance with the
Caterpillar Maintenance schedule “SEBU7572-09” and based upon 4380 average operating hours
per contractual year:

A. All parts will be replaced per Caterpillar guidelines; Service intervals may be combined to
minimize downtime.

B. Service contract will include the following: (please refer to “SEBU7572-09” for description of
each service).

C. Services will be performed in regular business hours

Service schedule below are described as per each engine
Engine #1 = KAR00959

Engine # 2 = KARO0960

Service Interval Based on 4380 hours NO. of Services

(parts and labor) Per Year

750 hours Service 18

3000 hour Service | 4 : J
8000 hour Service : 1

Oil Change 18 :

Top End — = I |

750hour SERVICE (INSPECTION):

Engine
e Measure Valve stem projections
e Measure/Adjust valve bridge
© Measure/Adjust valve lash
e Inspect/adjust/replace Spark Plugs

Cooling System:
e Inspect radiator/heat exchanger for leaks, exterior cleanliness and/or deterioration.
e Check and record coolant level.
* Check and record coolant freeze protection.
¢ Inspect hoses and connections for signs of leaks and/or deterioration.
* Inspect fan drive pulley and fan for signs of wear or cracks.
° Inspect fan drive belts for signs of cracking or deterioration.
* Confirm jacket water heater is working and record coolant temperature (engine not
running).
¢ Inspect water pump for any indication of leaks.
Air Intake and Exhaust System:
¢ Check air filter restriction gauge (if equipped with gauge)
for amount of filter restriction.
¢ Inspect filter element visually.
¢ Inspect air intake system for any loose components or
signs of wear/rubbing.
¢ Inspect turbocharger(s) (if equipped} for loose intake or
exhaust components.
Lube Oil System:
¢ Verify oil level is between “add” and “full” marks on dipstick.
¢ Inspect crankcase breather and related tubing for signs of leaks or excessive pressure.
¢ Crankcase fumes disposal tube/piping should be extended beyond radiator to prevent
oil mist contamination of radiator core.
© Note and record oil pressure on gauge with engine running.
¢ Obtain oil sample (via sample port with engine running) and send out for laboratory
analysis.
e Check for any signs of oil leaks.

Starting System:
e Check and record specific gravity reading of each battery cell
(if maintainable).
¢ Check for proper level of electrolyte in each cell.
© Check battery charger for proper operation and record amperage reading.
* Check and record the last date that batteries were replaced. Recommend that
batteries be replaced every three years, regardless of condition.

Control Panel:
© Verify gauges are operating and record readings.
* Check for presence of any warning lights/alarms.
¢ Perform lamp/bulb test.
Safety Controls - check for proper operation of safety devices:
* Overcrank
¢ Overspeed
¢ High Coolant Temperature
¢ Low Oil Pressure
¢ Not-in-Auto
e Emergency Stop
Fuel system:
e Inspect engine gas lines, regulator and carburetor for signs of leaks/corrosion.

e Inspect throttle and mixture valves and linkage {if equipped) for proper operation.

* Inspect ignition system (magneto/distributor/spark plugs/wires).
Operational Checks with Engine Running:

¢ Check for any leaks or unusual noises.

° Verify proper voltage and frequency via control panel gauges.

© Check for proper air inlet.

¢ Operate for no more than five (5) minutes without load.

Perform five (5) minute full generator output test. Customer representative must be
present to operate necessary circuit breaker to allow transfer to emergency source.

Walk-around inspection:
e Visual inspection of generator and environment.
¢ Check for signs of rodent/insect activity.
Conclusion of visit / Recommendations:
¢ Control panel: confirm control switch is in “auto” position.
¢ Circuit breaker: confirm genset is in run status
¢ Provide written recommendation(s) for any suggested repairs.
® Make electronic copy of inspection report available to customer.

¢ Provide written estimate of additional work to customer within one week of service

visit.
¢ Technician will clean up and dispose of any waste

3,000hour SERVICE (INSPECTION):

Done along with 7SOhour service

Alternator/battery charger - Inspect

Coolant Sample (Level 2) - Obtain

Cylinder Pressure - Test/Record

Engine Speed/Timing Sensor — Clean/Inspect
Generator Set Vibration- Test/Record
Ignition System Transformer Resistance - Test
Speed Sensor — Clean/Inspect

Starting Motor - Inspect

Stator Lead - Check

Water Pump - Inspect

H2S - Inspect

Boro-scope cylinders - Inspection

CCV Filter - Clean

Radiator external rinse - Clean

Woodward Load tuning - Adjust

HRSG - Inspection

Oil Change Specifics:

@ Replace lubricating oil and lubricating oil filters.

e Includes labor, and filters for oi! changes.
Supply of oil for oil changes, customer to provide any required make-up oil
Oil changes performed every 750 hours. If sample results indicate an oi] change
is required outside of scheduled service customer is responsible.

Customer Responsibilities

Provide timely access to plant for Milton CAT employees

Receive part deliveries ahead of services if necessary and stage in generator room
Maintain jacket water and cooling pumps

Maintain cooling system

Perform oil samples every 100 hours

Maintain coolant additives - as needed

Drain skid condensate bowls - daily

Control Panel - Inspect/Test - daily

Coolant Level - Check - daily
Electrical Connections — Check - daily
Engine Air Cleaner Service indicator — Inspect - daily
Engine Air Pre-cleaner - Check/Clean - daily
. Engine Oil Level - Check - daily
Fuel Filter Differential Pressure - Check - daily
Generator - Inspect - daily
Generator Load - Check - daily
Power Factor - Check - daily
Voltage and Frequency — Check - daily
Walk-Around Inspection - daily

YPNOVPOZETF AO - T TOMMoowPS

Excluded Services

The following services are not included under this Agreement, and if provided, will result in
additional charges to Customer. MCAT is not obligated to perform excluded services, unless the
parties arrange for such services under a separate agreement.

A. Pipework repairs from the flange on the engine

B. Maintenance and testing synchronizing breakers, switchgear & electrical distribution
system

C. Site modifications or changes if unit needs to be repaired off-site
Regulatory permitting of any kind

E. Crane/rigging required to remove unit or components for repair if onsite trolley and service
elevator cannot accommodate or doesn’t exist. MCAT accepts no responsibility for collateral
damage, other than that described in the penalty clause.

All Services outside of the “scope of work” (these will be quoted at T&M rates if required)

EPA or DEP emissions testing

= oO nm

Plant water\treatment \coolant replacement

Any additional cost of repairs or maintenance required as a result of misuse, alteration or
interference with the Maintained Equipment by any party other than MCAT or MCAT
subcontractor

Exhibit B Warranty

WARRANTY: Materials provided herein are warranted by Milton for twelve (12) months from the date
of invoice, limited to defects in materials and workmanship from the Milton’s supplier.

Services provided herein are warranted by Milton for ninety (90) days or fifty (SO) running hours,
whichever is less, and limited to defects in service workmanship provided by Milton. Extended
Service Coverage (ESC) or other Power Protection Programs offered by Milton are available and
will prevail if purchased separately and duly registered with Caterpillar, Inc. Inspection

and/or service by Milton do not guarantee that failures will not occur in any given time frame or
between Milton’s visits. Customer Reserves the right to accept/reject any recommendation

made by Milton regarding service, maintenance or repair of engines and equipment. OTHER
THAN AS EXPRESSLY PROVIDED HEREIN, MILTON MAKES NO WARRANTIES, EXPRESS OR IMPLIED,
IN FACT OR IN LAW, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

TO THE EXTENT THAT THE APPLICABLE JURISDICTION LIMITS THE COMPANY'S

ABILITY TO DISCLAIM ANY IMPLIEO WARRANTIES, THIS

DISCLAIMER SHALL BE EFFECTIVE TO THE MAXIMUM EXTENT PERMITTED. LIMITATION OF
LIABILITY: Milton's liability is limited to the value of the work, repair, or material actually contracted
for inthe Agreement during the effective dates of the Agreement. Milton shall not be liable

for any losses, damages, injuries, claims, demands and expenses including, but not limited to,
consequential or incidental damage caused by war, Acts of God, acts of terrorism,
governmental regulations, strike, loss damage, destruction, obsolescence, claims by third parties,
or loss by Customer as aresult of the faiture of the equipment to

perform or any loss or claim not herein specified, but of a contingent nature.

Exhibit C- Published service rates

TABLE 1: Service rates 10/01/2021 to 09/30/2022

Monday-Friday 7:00 AM-3:30 PM} Regular Time | $199.00/hr.
Regular Travel | $199.00/hr.

Monday-Friday 3:30 PM-7:30 PM Overtime $259.00/hr.
Overtime travel | $259.00/hr.

Monday-Friday 7:30 PM-7:00 AM | Premiumtime | $299.00/hr.
Premium travel | $299.00/hr.

Saturday First 12 hours Overtime $259.00/hr.
Overtime travel | $259.00/hr.

Saturday After 12 hours | Premiumtime | $299.00/hr.
Premium travel | $299.00/hr.

Sundays/Holidays All hours Premium time | $299.00/hr.

Premium travel

$299.00/hr.

Exhibit D- Contract Pricing

The pricing is based on the scope of work provided in Exhibit A
Refer to section 11 of the contract for escalation details.

Refer to section 8 for term and termination details.

Engine # 1 KARO0959 = $ 46,169.01 per year

Engine # 2 KAROO960 = $ 46,169.01 per year

Pricing that will apply to this contract over 3 years. $277,014.06

Exhibit E- Availability

e No availability guarantee applied to this contract,

Exhibit F- Execution Plan

. Alarm event occurs at the generator.

. Alarm status is sent via email from the customers BMS system or alternate remote
monitoring system to Milton CAT specific email address chp_alarms@miltoncat.com
Customer follows up the email with a phone call from their control center or directly from
site operator. Out of hours 508 962 2513. Business hours 508 636 6223.

. The Milton CAT project manager may need to contact the Nashua Wastewater Treatment
Department Superintendent, David Boucher (603-589-3562) to observe site
conditions valve position, pump running, oil leak etc.

Once the fault has been cleared and generator unit is deemed ready for operation the
project manager will contact the Nashua Wastewater Treatment Department
Superintendent, David Boucher to start the generator.

If the generator is unable to be re-started, then the Milton CAT project manager will
schedule a technician to site within the response time parameters specified in section 5
of PGE contract.

. The Milton CAT project manager will contact the Superintendent, David Boucher
(603-589-3562) and communicate the path forward. An email containing a brief work
plan will be sent to Superintendent ,David Boucher (BoucherD@NashuaNH.gov) .

. The Milton CAT technician will call the Superintendent, David Boucher
(603-589-3562) to establish access to the generator.

The Milton CAT technician will attend site and park at the generator and report to station
operator.

The Fault will be evaluated by the Milton CAT technician and appropriate measures will
used to correct the fault/ alarm

. The Milton CAT project manager will provide the site Superintendent ,David Boucher
(BoucherD@NashuaNH.gov) with a summary email containing the service report and
brief description of events.