F1These Class B Preferred Units (the "Preferred Units") were payable by the Issuer on August 31, 2018, to Preferred Unit holders of record on August 21, 2018, in satisfaction of the non-cash component of the second quarter 2018 distribution on the Preferred Units.
F2The Preferred Units are convertible into Common Units at any time, at the holder's election, subject to the requirement to convert a minimum of $17.5 million of Preferred Units. The Preferred Units have no expiration date. Each Preferred Unit is currently convertible into one Common Unit.
F3These Preferred Units are owned directly by Stonepeak Catarina Holdings LLC, and indirectly by Stonepeak Catarina Upper Holdings LLC, Stonepeak Infrastructure Fund (Orion AIV) LP, Stonepeak Associates LLC, Stonepeak GP Holdings LP, Stonepeak GP Investors LLC, Stonepeak GP Investors Manager LLC, Michael Dorrell and Trent Vichie. Stonepeak Catarina Upper Holdings LLC is the managing member of Stonepeak Catarina Holdings LLC. Stonepeak Infrastructure Fund (Orion AIV) LP is the managing member of Stonepeak Catarina Upper Holdings LLC. Stonepeak Associates LLC is the general partner of Stonepeak Infrastructure Fund (Orion AIV) LP. Stonepeak GP Holdings LP is the sole member of Stonepeak Associates LLC. Stonepeak GP Investors LLC is the general partner of Stonepeak GP Holdings LP. Stonepeak GP Investors Manager LLC is the managing member of Stonepeak GP Investors LLC. Each of Michael Dorrell and Trent Vichie serve as a managing member of Stonepeak GP Investors Manager LLC.
F4Each Reporting Person disclaims beneficial ownership of the Preferred Units except to the extent of his or its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the Preferred Units for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or for any other purpose.

Remarks

Exhibit 99.1: Additional Signatures. Solely for purposes of Section 16 of the Exchange Act, each of the Reporting Persons may be deemed to be directors-by-deputization by virtue of Stonepeak Catarina Holdings LLC's contractual right to, based on its current ownership, designate two persons to serve on the board of directors of the General Partner of the Issuer (the "Board"). Jack Howell and Luke Taylor, each an employee of Stonepeak Catarina Holdings LLC, are members of the Board.