Exhibit 99.2
JOINT FILERS' SIGNATURES
BCP Energy Services Fund GP, LP
By: BCP Energy Services Fund UGP, LLC, its general partner
By: /s/ Jeffrey Jenkins Date: June 20, 2018
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Name: Jeffrey Jenkins
Title: Authorized Person
BCP Energy Services Fund-A, LP
By: BCP Energy Services Fund GP, LP, its general partner
By: BCP Energy Services Fund UGP, LLC, its general partner
By: /s/ Jeffrey Jenkins Date: June 20, 2018
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Name: Jeffrey Jenkins
Title: Authorized Person
BCP Energy Services Fund, LP
By: BCP Energy Services Fund GP, LP, its general partner
By: BCP Energy Services Fund UGP, LLC, its general partner
By: /s/ Jeffrey Jenkins Date: June 20, 2018
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Name: Jeffrey Jenkins
Title: Authorized Person
Charah Holdings GP LLC
By: /s/ Mark Spender Date: June 20, 2018
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Name: Mark Spender
Title: Authorized Person
Charah Holdings LP
By: Charah Holdings GP LLC, its general partner
By: /s/ Mark Spender Date: June 20, 2018
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Name: Mark Spender
Title: Authorized Person
James Bernhard
By: /s/ James Bernhard Date: June 20, 2018
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Jeffrey Jenkins
By: /s/ Jeffrey Jenkins Date: June 20, 2018
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