<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>3
<FILENAME>mg3-ex99_1.txt
<TEXT>
                                                               Exhibit 99.1


FOOTNOTES

(1)  This statement is being filed by GSCP VI Advisors, L.L.C. ("GSCP VI
     Advisors"), GSCP VI Offshore Advisors, L.L.C. ("GSCP VI Offshore
     Advisors"), GS Advisors VI, L.L.C. ("GS Advisors VI"), GS Capital
     Partners VI Fund, L.P. ("GS Capital VI"), GS Capital Partners VI
     Offshore Fund, L.P. ("GS VI Offshore"), GS Capital Partners VI GmbH &
     Co. KG ("GS Germany VI"), GS Capital Partners VI Parallel, L.P., ("GS
     VI Parallel" and, together with GS Capital VI, GS VI Offshore and GS
     Germany VI, the "Funds"), (GSCP VI Advisors, GSCP VI Offshore
     Advisors, GS Advisors VI, and the Funds collectively, the "Reporting
     Persons"). Neither the present filing nor anything contained herein
     shall be construed as an admission that any Reporting Person
     constitutes a "person" for any purpose other than for compliance with
     Section 13(d) of the Securities Exchange Act of 1934, as amended (the
     "Exchange Act").

(2)  On October 31, 2007, the Funds invested in PVF Holdings LLC (formerly,
     McJ Holding LLC), an entity which controls McJunkin Red Man Holding
     Corporation (formerly, McJ Holding Corporation). McJunkin Red Man
     Holding Corporation owns 100% of the equity interests of McJunkin Red
     Man Corporation. McJunkin Red Man Corporation owns 623,521 shares of
     common stock, par value $0.10 per share of PrimeEnergy Corporation (
     "Common Stock").

     GS GmbH, a German company with limited liability, is the general
     partner of GS Germany VI. GSCP VI Advisors, a Delaware limited
     liability company, is the sole general partner of GS Capital VI. GSCP
     VI Offshore Advisors, a Delaware limited liability company, is the
     sole general partner of GS VI Offshore. GS Advisors VI, a Delaware
     limited liability company, is the sole managing limited partner of GS
     Germany VI and the sole general partner of GS VI Parallel. Each of GS
     Capital VI, a Delaware limited partnership, GS VI Offshore, a Cayman
     Islands exempted limited partnership, GS Germany VI, a German limited
     partnership, and GS VI Parallel, a Delaware limited partnership, was
     formed for the purpose of investing in equity, equity-related and
     similar securities or instruments, including debt or other securities
     or instruments with equity-like returns or an equity component.

     As of October 31, 2007, each of GS Capital VI and its sole general
     partner, GSCP VI Advisors, may be deemed to own beneficially and
     indirectly an aggregate of 135,491 shares of Common Stock by reason of
     McJunkin Red Man Corporation's beneficial ownership of 623,521 shares
     of Common Stock. Each of GS Capital VI and GSCP VI Advisors disclaims
     beneficial ownership of the securities reported herein except to the
     extent of its pecuniary interest therein, if any.

     As of October 31, 2007, each of GS VI Offshore and its sole general
     partner, GSCP VI Offshore Advisors, may be deemed to own beneficially
     and indirectly an aggregate of 112,670 shares of Common Stock by
     reason of McJunkin Red Man Corporation's beneficial ownership of
     623,521 shares of Common Stock. Each of GS VI Offshore and GSCP VI
     Offshore Advisors disclaims beneficial ownership of the securities
     reported herein except to the extent of its pecuniary interest
     therein, if any.

     As of October 31, 2007, GS VI Parallel may be deemed to own
     beneficially and indirectly an aggregate of 37,224 shares of Common
     Stock by reason of McJunkin Red Man Corporation's beneficial ownership
     of 623,521 shares of Common Stock. GS VI Parallel disclaims beneficial
     ownership of the securities reported herein except to the extent of
     its pecuniary interest therein, if any.

     As of October 31, 2007, GS Germany VI may be deemed to own
     beneficially and indirectly an aggregate of 4,801 shares of Common
     Stock by reason of McJunkin Red Man Corporation's beneficial ownership
     of 623,521 shares of Common Stock. GS Germany VI disclaims beneficial
     ownership of the securities reported herein except to the extent of
     its pecuniary interest therein, if any.

     As of October 31, 2007, GS GmbH, the general partner of GS Germany VI
     may be deemed to own beneficially and indirectly an aggregate of
     11,785 shares of Common Stock by reason of McJunkin Red Man
     Corporation's beneficial ownership of 623,521 shares of Common Stock.
     GS GmbH disclaims beneficial ownership of the securities reported
     herein except to the extent of its pecuniary interest therein, if any.

     As of October 31, 2007, GS Advisors VI, the sole managing limited
     partner of GS Germany VI and the sole general partner of GS VI
     Parallel, may be deemed to own beneficially and indirectly an
     aggregate of 42,025 shares of Common Stock by reason of McJunkin Red
     Man Corporation's beneficial ownership of 623,521 shares of Common
     Stock. GS Advisors VI disclaims beneficial ownership of the securities
     reported herein except to the extent of its pecuniary interest
     therein, if any.

(3)  Pursuant to the Merger Agreement, dated as of December 4, 2006 among
     McJunkin Red Man Corporation, McJunkin Red Man Holding Corporation and
     Hg Acquisition Corp., as amended (the "Merger Agreement"), upon a sale
     of shares of Common Stock by McJunkin Red Man Corporation from and
     after January 31, 2007, McJunkin Red Man Corporation has an obligation
     to remit to those persons who were the record holders of shares of
     McJunkin Red Man Corporation immediately prior to the effective time
     of the Merger (as defined in the Merger Agreement) an amount equal to
     95% of the after tax proceeds from such sale.
</TEXT>
</DOCUMENT>
