Seneca Resources Company, LLC

Onshore Production, Gathering & Boosting, and Natural Gas Processing
Best Management Practice CommitmentOption
Methane Challenge Partner Since2018

OMB Control No. 2060 0722
Approval expires 08/31/2021

9 SENECA

Resources

Background

Seneca Resources Company, LLC (Seneca), the exploration and production segment of National Fuel Gas
Company, explores for, develops and produces natural gas and oil reserves in California and the
Appalachian Region including the Marcellus and Utica Shales. Seneca is committed to reducing methane
emissions and to limit its environmental footprint. Since joining EPA voluntary methane reduction programs,
Seneca has documented methane reduction strategies totaling 1,895,075 Mcffrom 2015 through 2018. In
2018 Seneca expanded its participation in voluntary methane reduction strategies aimed at continuous
improvement.

Methane Reduction:
Substitute Pneumatic Devices

450,000
2 375,000
c 300,000

I

aJ 225,000
"g 150,000

1 ™ ¦ I I ¦ I

^ J*
S

Substitute Pneumatic Devices
with Low or Ze ro-bleed
Devices

Seneca has identified and categorized its pneumatic
controllers. In total, 1022 of these devices have
been substituted to low or zero-bleed controllers.
This has resulted in a methane reduction of 419,355
Mcf.

Methane Reduction:
Artificial Lift

1,000,000
900,000
2 800,000
« 700,000
jS 600,000
« 500,000
5 400,000
"§ 300,000
¦g 200,000
£ 100,000
0

Artificial Lift: Plungers/
Foaming Agents/Nitrogen Lift

Seneca proactively utilizes several artificial lift
technologies in an effort to maximize the well's
flowing performance which minimizes potential
methane emissions. Some of these technologies
include installing plunger life, employing foaming
agents, and utilizing nitrogen lit procedures. This
methane reduction strategy has resulted in 896,778
M cfof reduced emissions.

Template last updated; 06 January 2020

EPA Form No. 5900 413

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Seneca Resources Company, LLC Historical Fact Sheet

Methane Reduction:
Decommissioned Equipment

150,000

2 120,000
a)

J 90,000

Eliminate unnecessary
equipment and/or systems

Seneca regularly reviews engineering and design
of both existing and new facilities and equipment in
order to identity opportunities to eliminate
redundant and/or unnecessary equipment. Past
improvements have included compression
systems, produced water tanks, test/bulk
separators, and gas processing equipment
Through these engineering improvements, Seneca
has been able to achieve a meihane reduction of
121,718 Mcf.

Methane Reduction:

Increased Rate of LDAR Inspections



_















(0
-C





5





0 30

¦ ¦II





2015 2016 2017 2018 Cumulative

Increased Rate of LDAR
Inspections

In an effort to proactively identify and repair all
methane leaks, Seneca performs Leak Detection
and Repair Inspections following and often
exceeding the most stringent regulatory
requirements across all of if s facilities regardless
of applicability. This increased inspection schedule
has reduced potential methane emissions by an
estimated 75 Mcf since 2015.

Install Flash Tank Separators
on Glycol Dehydrators

Seneca has reduced its methane emissions by
21,507 Mcf through the installation of Flash Tank
Separators on its glycol dehydrators.

Methane Reduction:

Flash Tank Installations

27,000
tf 24,000

I 21,000

c 18,000
ro

£ 15,000
| 12,000
"S 9,000

'=¦1111

J?	A >$>

& # & •f /

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