Exhibit 99.2

                            JOINT FILERS' SIGNATURES


Atlas Technical Consultants Holdings LP
By: Atlas Technical Consultants Holdings GP LLC, its general partner
By: /s/ Chris Dillon                           Date: February 19, 2020
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    Name:  Chris Dillon
    Title: Authorized Person


Atlas Technical Consultants Holdings GP LLC
By: /s/ Chris Dillon                           Date: February 19, 2020
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    Name:  Chris Dillon
    Title: Authorized Person


BCP Energy Services Executive 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: February 19, 2020
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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: February 19, 2020
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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: February 19, 2020
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    Name:  Jeffrey Jenkins
    Title: Authorized Person


BCP Energy Services Fund GP, LP
By: BCP Energy Services Fund UGP, LLC, its general partner
By: /s/ Jeffrey Jenkins                        Date: February 19, 2020
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    Name:  Jeffrey Jenkins
    Title: Authorized Person


BCP Energy Services Fund UGP, LLC
By: /s/ Jeffrey Jenkins                        Date: February 19, 2020
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    Name:  Jeffrey Jenkins
    Title: Authorized Person


James Bernhard
By: /s/ James Bernhard                         Date: February 19, 2020
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Jeffrey Jenkins
By: /s/ Jeffrey Jenkins                        Date: February 19, 2020
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