EXHIBIT A

JOINT FILING STATEMENT

We, the undersigned, hereby express our agreement that the attached Schedule 13D is, and any further amendments thereto signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934. This agreement may be terminated with respect to the obligations to jointly file future amendments to such statement on Schedule 13D as to any of the undersigned upon such person giving written notice thereof to each of the other persons signatory hereto, at the principal office thereof.

Date: May 11, 2021

CHEVRON CORPORATION
By:	/s/ Pierre R. Breber
	Name: Pierre R. Breber
	Title: Vice President and Chief Financial Officer
NOBLE ENERGY, INC.
By:	/s/ Kari H. Endries
	Name: Kari H. Endries
	Title: Vice President and Secretary
NBL MIDSTREAM, LLC
By:	/s/ Aaron G. Carlson
	Name: Aaron G. Carlson
	Title: Vice President and Secretary
CADMIUM HOLDINGS INC.
By:	/s/ Kari H. Endries
	Name: Kari H. Endries
	Title: Secretary