--------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                                 Amendment No. 2

     -----------------------------------------------------------------------

                          RIVIERA HOLDINGS CORPORATION

                                (Name of Issuer)

                                  Common Stock

                         (Title of Class of Securities)

                                   769627 10 0

                                 (CUSIP Number)
                             D. Kerry Crenshaw, Esq.
                                 Clark Hill PLC
                         500 Woodward Avenue, Suite 3500
                             Detroit, MI 48226-3435
                                 (313) 965-8266
       (Name, Address and Telephone Number of Person Authorized to Receive
                           Notices and Communications)

                                December 31, 2006

             (Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(e), Rule 13d-1(f) or Rule 13d-1(g), check the
following box.|_|

Note: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7(b) for other
parties to whom copies are to be sent.

The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



CUSIP No. 769627 10 0

--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON

     DESERT ROCK ENTERPRISES LLC
     I.R.S. Identification No.: 20-3404082
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  |_|
                                                                 (b)  |X|
--------------------------------------------------------------------------------
3    SEC USE ONLY


--------------------------------------------------------------------------------
4    SOURCE OF FUNDS*

     WC
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   |_|


--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Nevada, United States of America
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER

                    797,100
               -----------------------------------------------------------------
  NUMBER OF    8    SHARED VOTING POWER
   SHARES
BENEFICIALLY        797,100
  OWNED BY     -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER
  REPORTING
   PERSON           797,100
    WITH       -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                    797,100
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     797,100
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*  |_|


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     6.39%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     OO
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!



CUSIP No. 769627 10 0

--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON

     The Derek J. Stevens Trust under agreement dated July 16, 1993
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  |_|
                                                                 (b)  |X|
--------------------------------------------------------------------------------
3    SEC USE ONLY


--------------------------------------------------------------------------------
4    SOURCE OF FUNDS*

     not applicable
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   |_|


--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     United States of America
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER

                    164,000
               -----------------------------------------------------------------
  NUMBER OF    8    SHARED VOTING POWER
   SHARES
BENEFICIALLY        961,100
  OWNED BY     -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER
  REPORTING
   PERSON           164,000
    WITH       -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                    961,100
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     961,100
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*  |_|


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     7.71%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     OO
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!



CUSIP No. 769627 10 0

--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON

     Derek J. Stevens
     (as trustee of the Derek J. Stevens Trust under agreement dated July 16,
     1993)
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  |_|
                                                                 (b)  |X|
--------------------------------------------------------------------------------
3    SEC USE ONLY


--------------------------------------------------------------------------------
4    SOURCE OF FUNDS*

     not applicable
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   |_|


--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     United States of America
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER

                    164,000
               -----------------------------------------------------------------
  NUMBER OF    8    SHARED VOTING POWER
   SHARES
BENEFICIALLY        961,100
  OWNED BY     -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER
  REPORTING
   PERSON           164,000
    WITH       -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                    961,100
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     961,100
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*  |_|


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     7.71%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     IN
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!



CUSIP No. 769627 10 0

--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON

     The Gregory J. Stevens Trust under agreement dated September 20, 1995
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  |_|
                                                                 (b)  |X|
--------------------------------------------------------------------------------
3    SEC USE ONLY


--------------------------------------------------------------------------------
4    SOURCE OF FUNDS*

     not applicable
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   |_|


--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     United States of America
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER

                    90,000
               -----------------------------------------------------------------
  NUMBER OF    8    SHARED VOTING POWER
   SHARES
BENEFICIALLY        887,100
  OWNED BY     -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER
  REPORTING
   PERSON           90,000
    WITH       -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                    887,100
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     887,100
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*  |_|


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     7.11%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     OO
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!



CUSIP No. 769627 10 0

--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON

     Gregory J. Stevens
     (as trustee of the Gregory J. Stevens Trust under agreement dated
     September 20, 1995)
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  |_|
                                                                 (b)  |X|
--------------------------------------------------------------------------------
3    SEC USE ONLY


--------------------------------------------------------------------------------
4    SOURCE OF FUNDS*

     not applicable
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   |_|


--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     United States of America
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER

                    90,000
               -----------------------------------------------------------------
  NUMBER OF    8    SHARED VOTING POWER
   SHARES
BENEFICIALLY        887,100
  OWNED BY     -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER
  REPORTING
   PERSON           90,000
    WITH       -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                    887,100
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     887,100
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*  |_|


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     7.11%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     IN
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!



Item 1. Security and Issuer

      No material change. The class of equity securities to which this statement
on Schedule 13D (the "Statement")  relates is the common stock, par value $0.001
per share (the  "Common  Stock"),  of  Riviera  Holdings  Corporation,  a Nevada
corporation  (the "Issuer"),  and is being filed pursuant to Rule 13d-1(a) under
the  Securities  Exchange Act of 1934,  as amended  (the  "Exchange  Act").  The
principal  executive  offices  of the  Issuer  are  located  at 2901  Las  Vegas
Boulevard South, Las Vegas, Nevada 89109.

Item 2. Identity and Background

      This  Amendment No. 2 amends the Schedule 13D (the  "Schedule  13D") filed
with the  Securities  and  Exchange  Commission  on  September  22, 2006 and the
Amendment No. 1 to Schedule 13D  ("Amendment No. 1", and  collectively  with the
Schedule 13D, the "Schedule 13D Filings") filed with the Securities and Exchange
Commission  on November 9, 2006,  on behalf of Desert  Rock  Enterprises  LLC, a
Nevada limited  liability  company ("Desert Rock"),  the Derek J. Stevens Trust,
under  agreement dated July 16, 1993 (a trust formed under the laws of the State
of Michigan  for the sole  benefit of Derek J.  Stevens,  the "Derek J.  Stevens
Trust"), Derek J. Stevens, as trustee of the Derek J. Stevens Trust, the Gregory
J. Stevens Trust, under agreement dated September 20, 1995 (a trust formed under
the laws of the State of Michigan  for the sole  benefit of Gregory J.  Stevens,
the  "Gregory  J.  Stevens  Trust") and  Gregory J.  Stevens,  as trustee of the
Gregory J. Stevens  Trust,  with respect to the Common Stock of the Issuer.  The
five  persons are  collectively  referred  to as the  "Reporting  Persons".  The
Reporting  Persons are filing  jointly  and the  agreement  among the  Reporting
Persons to file  jointly is attached as Exhibit 6 hereto,  and  incorporated  by
reference herein.  Except as specifically  provided herein, this Amendment No. 2
does not modify any of the  information  reported in the  Schedule  13D Filings.
Capitalized  terms used but not otherwise defined herein shall have the meanings
heretofore ascribed to them in the Schedule 13D Filings.

      The principal  office of Desert Rock is 3960 Howard Hughes Parkway,  Suite
562, Las Vegas,  Nevada 89109.  The business  address of Derek J.  Stevens,  the
Derek J. Stevens Trust, Gregory J. Stevens the Gregory J. Stevens Trust is 21777
Hoover Road, Warren, MI 48089, United States of America.

      The  principal  business  of Desert  Rock is that of a  limited  liability
company,  currently  focusing on the acquisition and development of real estate,
including casino properties.  Derek J. Stevens is the Manager of Desert Rock and
the sole trustee of the Derek J. Stevens Trust.  Both the Derek J. Stevens Trust
and the Gregory J. Stevens Trust are members of Desert Rock, and serve as trusts
for Derek J. Stevens and Gregory J. Stevens, respectively. Gregory J. Stevens is
the sole trustee of the Gregory J. Stevens Trust.

      During the last five years,  neither any Reporting Person nor, to the best
knowledge of any  Reporting  Person,  any person named in this Item 2, has been:
(i) convicted in a criminal proceeding  (excluding traffic violations or similar
misdemeanors),  or (ii) has been a party to a civil  proceeding of a judicial or
administrative body of competent jurisdiction and as a result of such proceeding
was or is  subject  to a  judgment,  decree  or  final  order  enjoining  future
violations  of, or prohibiting  or mandating  activities  subject to, federal or
state securities laws or finding any violation with respect to such laws.

Item 3. Source and Amount of Funds or Other Consideration

      Item  3 is  hereby  amended  and  supplemented  by  adding  the  following
paragraph:

      In  acquiring  797,100  shares of the Common  Stock of the Issuer prior to
December 31, 2006, Desert Rock expended approximately $16,090,218 of its working
capital.  In acquiring 164,000 shares of the Common Stock of the Issuer prior to
December 31, 2006, the Derek J. Stevens Trust expended approximately  $3,452,733
of the funds it held in trust. In acquiring 90,000 shares of the Common Stock of
the Issuer  prior to December 31, 2006,  the Gregory J. Stevens  Trust  expended
approximately  $1,695,447  of the funds it held in trust.  Derek J.  Stevens and
Gregory J. Stevens are listed on this  Amendment No. 2 to Schedule 13D solely in
their  capacity as members of Desert  Rock as  trustees of the Derek J.  Stevens
Trust and the Gregory J. Stevens Trust, respectively.

Item 4. Purpose of Transaction



      No  material  change.  Desert  Rock,  the Derek J.  Stevens  Trust and the
Gregory J. Stevens  Trust  acquired the shares in order to invest in the Issuer.
The  Reporting  Persons  intend  to review  from time to time both the  Issuer's
business affairs and the business affairs and financial position of Desert Rock.
Based  on  such  evaluation  and  review,  and  subject  to  applicable  law and
regulation and depending upon certain factors, including without limitation, the
financial  performance  of the Issuer,  the Reporting  Persons may consider from
time to time various  strategic  alternatives.  Such strategic  alternatives may
include,  among other things, (i) the acquisition of additional shares of Common
Stock or other  securities  of the  Issuer  through  open  market  purchases  or
otherwise,  (ii) the sale of any  number  of  shares  of  Common  Stock or other
securities  of  the  Issuer   through  the  open  market  or  otherwise,   (iii)
extraordinary  corporate  transactions,  (iv) a sale or  transfer  of a material
amount of assets of the Issuer or any of its  subsidiaries,  or (v) any other of
the matters described in clauses (a) through (j) of Item 4 of Schedule 13D.

      As part of the Reporting  Persons'  ongoing review of their  investment in
the Common Stock of the Issuer,  each and/or all of the  Reporting  Persons will
from time to time hold talks or  discussions  with and respond to inquiries from
various parties, including, without limitation, the Issuer's Board of Directors,
management or representatives,  other shareholders and other persons or entities
regarding the Issuer's affairs and strategic alternatives.

Item 5. Interest in Securities of the Issuer.

      Item  5 is  hereby  amended  and  supplemented  by  adding  the  following
paragraph:

      Based  upon the  Issuer's  Quarterly  Report on Form 10-Q for the  quarter
ended  September  30,  2006,  there  were  12,463,755  shares  of  Common  Stock
outstanding as of November 1, 2006.  Based on the foregoing,  the 797,100 shares
of Common Stock beneficially owned by Desert Rock represent  approximately 6.39%
of the Common Stock issued and  outstanding  (the  "Desert  Rock  Shares"),  the
164,000  shares of Common Stock  directly  owned by the Derek J.  Stevens  Trust
represent  approximately  1.3% of the Common Stock issued and  outstanding  (the
"Derek J. Stevens Trust Shares"), and the 90,000 shares of Common Stock directly
owned by the  Gregory  J.  Stevens  Trust  represent  approximately  0.7% of the
Commons Stock issued and  outstanding  (the "Gregory J. Stevens Trust  Shares").
Collectively,  the 1,051,100 shares  beneficially owned by the Reporting Persons
represents  approximately  8.43% of the Common Stock issued and outstanding (the
"Subject  Shares").  The Subject Shares are comprised of the Desert Rock Shares,
the Derek J. Stevens Trust Shares and the Gregory J. Stevens Trust Shares.

      Desert  Rock will have the power to vote or to direct the vote of (and the
power to dispose or direct  the  disposition  of) the  Desert  Rock  Shares.  As
members of Desert Rock,  the Derek J.  Stevens  Trust and the Gregory J. Stevens
Trust may be deemed to have the shared  power to vote or direct the vote of (and
the  shared  power to  dispose or direct  the  disposition  of) the Desert  Rock
Shares,  and as Manager of Desert  Rock,  Derek J. Stevens may be deemed to have
the shared  power to vote or direct the vote of (and the shared power to dispose
or direct the  disposition  of) the  Desert  Rock  Shares.  None of the Derek J.
Stevens  Trust,  the Gregory J.  Stevens  Trust,  Derek J. Stevens or Gregory J.
Stevens  owns  any of the  Desert  Rock  Shares  and  each  such  entity  and/or
individual disclaims any beneficial ownership of the Desert Rock Shares (and any
shares of Common Stock held by Desert Rock).

      The Derek J.  Stevens  Trust  will have the power to vote or to direct the
vote of (and the power to  dispose or direct  the  disposition  of) the Derek J.
Stevens Trust Shares. As trustee of the Derek J. Stevens Trust, Derek J. Stevens
may be deemed to have the  shared  power to vote or direct  the vote of (and the
shared power to dispose or direct the disposition of) the Derek J. Stevens Trust
Shares.  Derek J. Stevens does not own any of the Derek J. Stevens Trust Shares,
and disclaims any beneficial ownership of the Derek J. Stevens Trust Shares.

      The Gregory J. Stevens  Trust will have the power to vote or to direct the
vote of (and the power to dispose or direct the  disposition  of) the Gregory J.
Stevens Trust  Shares.  As trustee of the Gregory J. Stevens  Trust,  Gregory J.
Stevens  may be deemed to have the  shared  power to vote or direct  the vote of
(and the shared  power to dispose or direct the  disposition  of) the Gregory J.
Stevens  Trust  Shares.  Gregory J.  Stevens  does not own any of the Gregory J.
Stevens Trust Shares,  and disclaims any beneficial  ownership of the Gregory J.
Stevens Trust Shares.

      Derek J. Stevens does not personally own any shares of the Common Stock of
the Issuer directly.  By virtue of Derek J. Stevens'  position as the Manager of
Desert Rock, and as trustee of the Derek J. Stevens Trust (which trust is also a
member of Desert Rock),  Derek J. Stevens may be deemed to have the shared power
to vote or direct the



vote of (and the  shared  power to dispose  or direct  the  disposition  of) the
Desert Rock Shares and/or the Derek J. Stevens  Trust  Shares.  Derek J. Stevens
disclaims any beneficial ownership of any of the Subject Shares.

      Gregory J. Stevens does not  personally own any shares of the Common Stock
of the Issuer directly. By virtue of Gregory J. Stevens' position as the trustee
of the Gregory J. Stevens  Trust (which trust is also a member of Desert  Rock),
Gregory J.  Stevens may be deemed to have the shared power to vote or direct the
vote of (and the  shared  power to dispose  or direct  the  disposition  of) the
Desert  Rock Shares  and/or the  Gregory J.  Stevens  Trust  Shares.  Gregory J.
Stevens disclaims any beneficial ownership of any of the Subject Shares.

      As of the date  hereof,  neither  any  Reporting  Person,  nor to the best
knowledge of any Reporting Person,  any of the persons set forth in Item 2, owns
any shares of the Common Stock of the Issuer other than the Subject Shares.

      Within the last 60 days since the date of the filing of this Amendment No.
2, no  transactions in shares of Common Stock of the Issuer were effected by any
Reporting Person,  or to the best knowledge of any Reporting Person,  any of the
persons set forth in Item 2.

      No person other than the Reporting Persons has the right to receive or the
power to direct the receipt of dividends from, or the proceeds from the sale or,
the Subject Shares.

      Clause (e) of Item 5 of Schedule 13D is not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to
Securities of the Issuer.

      No material change.  Except for the matters described herein,  neither the
Reporting Persons nor, to the best knowledge of any Reporting Person, any of the
person  listed  in  Item 2,  has any  contract,  arrangement,  understanding  or
relationship with any person with respect to any securities of the Issuer.

Item 7. Material to be Filed as Exhibits.

EXHIBIT 1   Power of Attorney,  granted by Derek J. Stevens,  relating to Desert
            Rock  Enterprises  LLC, in favor of the  signatories  hereto,  dated
            September 20, 2006.

EXHIBIT 2   Power of  Attorney,  granted by Derek J.  Stevens,  relating  to the
            Derek J. Stevens Trust,  in favor of the signatories  hereto,  dated
            September 20, 2006.

EXHIBIT 3   Power of Attorney,  granted by Gregory J.  Stevens,  relating to the
            Gregory J. Stevens Trust, in favor of the signatories hereto,  dated
            September 20, 2006.

EXHIBIT 4   Power of  Attorney,  granted  by Derek  J.  Stevens  in favor of the
            signatories hereto, dated September 20, 2006.

EXHIBIT 5   Power of  Attorney,  granted by  Gregory J.  Stevens in favor of the
            signatories hereto, dated September 20, 2006.

EXHIBIT 6   Joint Filing Agreement,  by and among the Reporting  Persons,  dated
            September 20, 2006.

Signatures.

      After  reasonable  inquiry  and to the  best of each of the  undersigned's
knowledge  and  belief,  each of the  undersigned,  severally  and not  jointly,
certifies that the information set forth in this statement is true, complete and
correct.  Powers of Attorney,  dated  September  20,  2006,  granted by Derek J.
Stevens,  on behalf of Desert Rock  Enterprises  LLC, the Derek J. Stevens Trust
and himself individually,  in favor of D. Kerry Crenshaw, and granted by Gregory
J. Stevens on behalf of the Gregory J. Stevens  Trust and himself  individually,
in favor of D. Kerry Crenshaw, are attached hereto as Exhibits 1, 2, 3, 4 and 5,
and incorporated herein by reference.

February 14, 2007
Date



DESERT ROCK ENTERPRISES LLC

/s/ Derek J. Stevens
-----------------------------------
By: Derek J. Stevens, its Manager


DEREK J. STEVENS

/s/ Derek J. Stevens
-----------------------------------


THE DEREK J. STEVENS TRUST, under agreement dated July 16, 1993

/s/ Derek J. Stevens
-----------------------------------
By: Derek J. Stevens, its Trustee


THE GREGORY J. STEVENS TRUST, under agreement dated September 20, 1995

/s/ Gregory J. Stevens
-----------------------------------
By: Gregory J. Stevens, its Trustee


GREGORY J. STEVENS

/s/ Gregory J. Stevens
-----------------------------------

Attention:  Intentional  misstatements  or omissions of fact constitute  Federal
criminal violations (See 18 U.S.C. 1001).