Document:

Exhibit 10(j)

           Start-up Agreement and Third Amendment to Master Agreement

     This Start-up Agreement and Third Amendment to Master Agreement (this
"Agreement") is made and entered into as of this 11th day of March, 2004, by and
among Redwood Energy Production, L.P., a Texas limited partnership ("Redwood"),
Gateway Processing Company, a Texas corporation ("Gateway"), and Hanover
Compression Limited Partnership, a Delaware limited partnership ("Hanover").
Redwood, Gateway, and Hanover are sometimes hereinafter individually referred to
as a "Party" and collectively referred to as the "Parties." Capitalized terms
not otherwise defined herein shall have the meanings set forth in the Master
Agreement (hereafter defined).

                                    RECITALS

     WHEREAS, the Parties have previously entered into that Master Agreement and
the Ancillary Agreements dated as of June 15, 2001 with respect to the
production of gas from the Rodessa/Sligo Interval of the Madisonville Rodessa
Field in Madison County, Texas (the "Project"); and

     WHEREAS, the Master Agreement was amended by that First Amended and
Restated Master Agreement dated September 12, 2002, and was further amended by
that Amendment to First Amended and Restated Master Agreement dated February 14,
2003 (collectively, the "Master Agreement");

     WHEREAS, Redwood has established gas production from the Ruby Magness Well
No.1, Hanover has completed the Treatment Plant, and Gateway has installed
gathering, Acid Gas disposal, and transportation pipelines and the Project has
completed its start-up mode;

     WHEREAS, the Parties desire to enter into this Agreement to clarify their
respective rights and obligations and to modify certain provisions of the Master
Agreement;

     NOW, THEREFORE, the Parties agree as follows:

                                   ARTICLE I.
                  Allocation of Proceeds in the Start-up Months

     For purposes of this Agreement, and subject to the terms hereof, the months
of May through September, 2003 shall be deemed the "Start-up Months."

     1.1 May 2003. The Parties have received disbursements from the sale of
MMBtu's Delivered during May, 2003 from the Rodessa/Sligo Interval of the
Madisonville Rodessa Field in the following amounts:

<PAGE>

           Redwood                      Hanover                   Gateway
           -------                      -------                   -------
         $121,979.99                 $121,979.31                 $10,000.00
         ($14,273.68)*
         ($48,503.03)**              ($48,503.03)**
         --------------              --------------

         TOTAL
         =====
         $59,202.28                  $73,476.28                  $10,000.00
         ==========                  ==========                  ==========

* The cost to Redwood of 2,663 MMBtus of line pack gas purchased in April, 2003
at $5.36/MMBtu. The Parties agree that Redwood is entitled to receive 2,663
MMBtus of line pack gas at the sales meter of the Lone Star transportation
pipeline free and clear of any costs of treatment or gathering/transportation
upon the earlier to occur of (i) the termination of the Master Agreement or (ii)
cessation of production from the Rodessa/Sligo Interval of the Madisonville
Rodessa Field.

** These figures represent the cost to Redwood and Hanover of 16,636 MMBtus of
gas purchased for Treatment Plant operations and testing in May, 2003 at
$5.67/MMBtu.

     1.2 June 2003. The Parties have received disbursements from the sale of
MMBtu's Delivered during June, 2003 from the Rodessa/Sligo Interval of the
Madisonville Rodessa Field in the following amounts:

           Redwood                     Hanover                    Gateway
           -------                     -------                    -------
         $345,048.93                 $278,774.92                 $54,000.00

     1.3 July 2003. The Parties have received disbursements from the sale of
MMBtu's Delivered during July, 2003 from the Rodessa/Sligo Interval of the
Madisonville Rodessa Field in the following amounts:

           Redwood                     Hanover                     Gateway
           -------                     -------                     -------
         $376,482.61                 $376,482.61                 $54,000.00

     1.4 August 2003. The Parties have received disbursements from the sale of
MMBtu's Delivered during August, 2003 from the Rodessa/Sligo Interval of the
Madisonville Rodessa Field in the following amounts:

           Redwood                     Hanover                     Gateway
           -------                     -------                     -------
         $448,749.18                 $443,749.18                 $69,000.00

     1.5 September 2003. The Parties have received disbursements from the sale
of MMBtu's Delivered during September, 2003 from the Rodessa/Sligo Interval of
the Madisonville Rodessa Field in the following amounts:

                                      -2-
<PAGE>

           Redwood                     Hanover                     Gateway
           -------                     -------                     -------
         $427,284.33                 $414,944.90                 $63,000.00

                                  ARTICLE II.
                         Termination of Start-up Period

     From and after October 1, 2003 the Parties recognize and acknowledge that
the Start-up Period has ended, and the Parties shall act in accordance with the
Master Agreement, as amended hereby. The Parties agree that the Contract Year
for the Initial Term hereof shall commence as of October 1, 2003. The allocation
of proceeds from the Project for the months of October, November, and December,
2003 and January, 2004 are set forth as follows:

     2.1 October 2003. The Parties have received disbursements from the sale of
MMBtu's Delivered during October, 2003 from the Rodessa/Sligo Interval of the
Madisonville Rodessa Field in the following amounts:

           Redwood                     Hanover                     Gateway
           -------                     -------                     -------
         $479,116.00                 $634,000.00                 $56,000.00

     2.2 November 2003. The Parties have received disbursements from the sale of
MMBtu's Delivered during November, 2003 from the Rodessa/Sligo Interval of the
Madisonville Rodessa Field in the following amounts:

           Redwood                     Hanover                     Gateway
           -------                     -------                     -------
         $552,706.00                 $646,807.00                 $59,840.00

     2.3 December 2003. The Parties have received disbursements from the sale of
MMBtu's Delivered during December, 2003 from the Rodessa/Sligo Interval of the
Madisonville Rodessa Field in the following amounts:

           Redwood                     Hanover                     Gateway
         $626,088.00                 $676,120.00                 $68,538.00

     2.4 January 2004. The Parties have received disbursements from the sale of
MMBtu's Delivered during January, 2004 from the Rodessa/Sligo Interval of the
Madisonville Rodessa Field in the following amounts:

           Redwood                     Hanover                     Gateway
           -------                     -------                     -------
         $924,121.00                 $750,773.00                 $95,832.00

                                      -3-

<PAGE>

                                  ARTICLE III.
                        Modifications to Master Agreement

     3.1 Set Off. Redwood and Hanover have been negotiating Hanover's agreement
to pay a portion of the land-related legal fees and expenses incurred by Redwood
in connection with the Project as set forth in Section 3.2 of the original
Master Agreement dated June 15, 2001. Under Section 3.7 of the Master Agreement,
Redwood agreed to pay 1/3rd of costs not to exceed $200,000.00 to acquire and
install the equipment and facilities to implement the overall emergency
contingency plan. Hanover and Redwood hereby agree to set off the land-related
legal fees and expenses incurred by Redwood against the $66,666.00 owed by
Redwood to Hanover under Section 3.7 of the Master Agreement, and each of
Redwood and Hanover hereby RELEASES and DISCHARGES the other from any and all
liability with respect to land-related legal fees and expenses incurred by
Redwood and the $66,666.00 owed by Redwood to Hanover under Section 3.7 of the
Master Agreement, and does hereby WAIVE any claims, causes of action, suits, or
actions against the other with respect thereto.

     3.2 Gateway Payment. To assist Redwood in the resolution of certain
landowner issues, Gateway agreed that if the Resale Price for gas in November,
2003 is $3.75 or more, Gateway shall pay to Redwood, prior to December 31, 2003,
the first $6,000.00 of the amount realized by Gateway for the difference between
the Floating Monthly Treating Fee and the Fixed Monthly Treating Fee. The
Parties acknowledge and recognize that Gateway paid Redwood the $6,000.00 in
January, 2004.

     3.3 Incentive Price. The Parties recognize and acknowledge that Gateway and
Hanover have performed in a timely manner with respect to the installation of
pipelines and the Treatment Plant under the Master Agreement; therefore, in
accordance with the Master Agreement and Section 7.2(d) of the Gas Purchase
Agreement, the Parties agree that the price of $3.75 per MMBtu shall be
substituted for $4.00 per MMBtu (except that the $4.00 figure shall remain in
place in the computation of royalty in accordance with the Master Agreement) in
the calculation of the Floating Monthly Treating Fee throughout the term of the
Gas Purchase Agreement.

     3.4 Modification to Gas Purchase Agreement. Section 7.3 of the Gas Purchase
Agreement is hereby deleted in its entirety.

     3.5 Modification to Escrow. After the date of execution hereof, the Parties
will act in accordance with the Master Agreement to establish an Escrow Account
to receive all future proceeds attributable to the sale of MMBtu's Delivered.

     3.6 Ratification. As modified herein, the Parties hereby RATIFY, CONFIRM,
and ADOPT the Master Agreement and those Ancillary Agreements to which the
Parties are signatories.

     3.7 Notices. In accordance with the Master Agreement, Hanover hereby
notifies the other Parties of a change its contact person, address, and
information, as follows:

                                      -4-

<PAGE>

                  Hanover Compression Limited Partnership
                  11302 Tanner Road
                  Houston, TX 77041
                  Attn: Mr. Allen Stults, Vice President
                  Telephone (713)  896-2555
                  Facsimile: (713)  896-2652

     3.8 Application of Proceeds. Redwood and Hanover agree that all proceeds
received by Hanover during the Start-up Period and during the Initial Term
hereunder shall be deemed payments of the Fixed Monthly Treating Fee or the
Floating Monthly Treating Fee, as applicable, and such payments shall reduce the
Four Million Five Hundred Thousand Dollar ($4,500,00.00) secured amount set
forth in Section 3.6 of the First Amended and Restated Master Agreement dated as
of the 12th day of September, 2002.

                                  ARTICLE IV.
                          Electrical Cost Reimbursement

     4.1 Treatment Plant Electricity. Section 6.1 of the Master Agreement is
hereby modified to provide the following:

The Parties have determined that Hanover should purchase rather than generate
electricity for a portion of the Treatment Plant's power requirements in order
to secure the benefit of additional MMBtus Delivered (as such term is used in
the Gas Purchase Agreement). Accordingly, Hanover shall use its reasonable
commercial efforts to acquire electricity at the lowest available rate from
unaffiliated Third Party suppliers. Hanover must obtain the prior written
approval of Redwood for any power purchase transaction with any affiliated or
related entity. Hanover further shall use its reasonable commercial efforts to
provide for adequate electrical service to the Treatment Plant in a timely
manner so as not to impede or delay the commencement of commercial operations of
the Treatment Plant. In order to secure the benefit of additional MMBtus
Delivered, the Parties agree that, in addition to the Fixed Monthly Treating Fee
or the Floating Monthly Treating Fee (as such terms are used in the Gas Purchase
Agreement), as applicable, Hanover shall be entitled to receive from the
proceeds attributable to the sale of MMBtus Delivered on a monthly basis, the
following payments (the "Electricity Cost Reimbursement"):

                                      -5-

<PAGE>

-------------------------------- -----------------------------------------------
  Monthly Resale Price
(as such term is used in
 the Gas Purchase Agreement):             Electricity Cost Reimbursement
-------------------------------- -----------------------------------------------
Equal to or Less than $2.50      None
-------------------------------- -----------------------------------------------
$2.51 to $2.60                   the lesser of the actual invoice for purchased
                                 electricity or $5,984
-------------------------------- -----------------------------------------------
$2.61 to $2.75                   the lesser of the actual invoice for purchased
                                 electricity or $11,968
-------------------------------- -----------------------------------------------
                                 the lesser of the actual invoice for purchased
$2.76 to $3.00                   electricity or $23,936
-------------------------------- -----------------------------------------------
                                 the lesser of the actual invoice for purchased
$3.01 to $3.25                   electricity or $33,511
-------------------------------- -----------------------------------------------
                                 the lesser of the actual invoice for purchased
$3.26 to $3.50                   electricity or $40,691
-------------------------------- -----------------------------------------------
Equal to or Greater than $3.51   the lesser of the actual invoice for purchased
                                 electricity or $45,000
-------------------------------- -----------------------------------------------

     4.2 Payment of Electricity Cost Reimbursement. Hanover shall receive its
payments of the Electricity Cost Reimbursement from the Escrowed Funds in
accordance with the Escrow Agreement. The Parties further agree that the
Electricity Cost Reimbursement is a limited recourse obligation of the type
described in Section 5.3 of the Master Agreement and Hanover shall look solely
to the MMBtus Delivered each month as the source of payment of the corresponding
Electricity Cost Reimbursement incurred in said month. The foregoing Electricity
Cost Reimbursements are based on Hanover providing a minimum Treatment Plant
efficiency of sixty-six and two-thirds percent (66 2/3%) for each month. The
sixty-six and two-thirds percent (66 2/3%) minimum Treatment Plant efficiency
calculation shall be based on a fraction, a) the numerator of which is the
volume of gas (measured in Mcfs) redelivered to Gateway at the tailgate of the
Treatment Plant in any month multiplied by a decimal of the average Btu/cf
content of the tailgate gas volume for such month as determined at the Point of
Measurement set forth in the Gas Purchase Agreement (with 1,000 Btus expressed
as 1.00), and b) the denominator of which is the inlet gas volumes (measured in
Mcfs) for such month. If the minimum Treatment Plant efficiency based upon the
foregoing calculation is less than sixty-six and two-thirds percent (66 2/3%),
then appropriate adjustments will be made to Hanover's portion of the Fixed
Monthly Treating Fee and Electricity Cost Reimbursement in order to compensate
Redwood for such diminished volumes; provided, however, Gateway's portion of the
Fixed Monthly Treating Fee shall not be reduced or diminished hereunder due to
the failure of the Treatment Plant to achieve minimum efficiency.

     IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be
duly executed and delivered by its respective officers, thereunto duly
authorized, in multiple originals, all as of the day and year first above
written.

                                      -6-

<PAGE>

                                   REDWOOD ENERGY PRODUCTION, L.P.

                                   By:      Redwood Energy Company,
                                            its General Partner

                                   By:
                                            ------------------------------------
                                   Name:
                                            ------------------------------------
                                   Title:
                                            ------------------------------------

                                   GATEWAY PROCESSING COMPANY

                                   By:
                                            ------------------------------------
                                   Name:
                                            ------------------------------------
                                   Title:
                                            ------------------------------------

                                   HANOVER COMPRESSION LIMITED PARTNERSHIP

                                   By:
                                            ------------------------------------
                                   Name:
                                            ------------------------------------
                                   Title:
                                            ------------------------------------

                                      -7-Exhibit 10(k)

June 21, 2004

Earl Hoffman
Advanced Extraction Technologies, Inc.
2 Northpoint Drive, Suite 820
Houston, TX  77060
RE:  Small NRU - Gross Margin/Process Royalty

Dear Earl:

     Pending a formal amendment to the First Amended and Restated Agreement to
Develop Natural Gas Treatment Projects using the Mehra Gas Treating Units dated
January 1, 2004, this will confirm the following agreement regarding Mehra
Process nitrogen rejection units (NRU) with an inlet capacity of 2,500 Mcf per
day or less.

     Gateway will have the NRU fabricated by Process Recovery Systems (John
Tyson) based on a Process Design Basis Package prepared by AET at no cost to
Gateway or PRS. PRS will also ship to and install the NRU at the producer's
site. Gateway will quote the producer a turnkey price for the installed and
operational NRU to include the NRU, freight costs, installation charges and
technical support from AET through start-up and achievement of the performance
guarantees for the NRU. Gateway and AET will share equally the gross margin
realized on the installed NRU; provided, however, that AET will receive at least
$75,000 of the gross margin. The gross margin on the installed NRU is equal to
the turnkey price paid by the producer less the dollar amount invoice to Gateway
by Process Recovery Systems to design, purchase equipment components, fabricate,
ship, and install the NRU.

     In addition, we expect to obligate the producer to pay a Project Fee, which
consists of a development fee payable to Gateway and a process royalty payable
to AET, of at least $0.05 per inlet Mcf starting no earlier than the beginning
of the fifth year of operation. This Project Fee, if any, will be shared equally
between Gateway and AET.

     This letter agreement may be terminated by either party on thirty days
prior written notice to the other party; provided, however, that it shall remain
in effect with regard to each NRU with a capacity of 2,500 Mcf per day or less
for which a definitive agreement has been executed prior to the termination date
of this letter agreement by Gateway and a third party for the fabrication and
installation of the NRU.

Very truly yours,

/s/ Michael Fadden
------------------
Michael Fadden
President

Accepted and agreed to this 21st day of June 2004.

By:  /s/  Earl P. Hoffman
     --------------------
          Earl P. Hoffman

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