Document:

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                                                                   EXHIBIT 10.20

                          FIRM TRANSPORTATION AGREEMENT

                               DATED JUNE 8, 2005

                                     BETWEEN

                           REGENCY INTRASTATE GAS LLC

                                       AND

                        ANADARKO ENERGY SERVICES COMPANY

                                   RELATING TO

                               SECTION 311(A) (2)

                      TRANSPORTATION OF NATURAL GAS IN THE

                               STATE OF LOUISIANA

SPECIFIC TERMS IN THIS EXHIBIT HAVE BEEN REDACTED BECAUSE CONFIDENTIAL TREATMENT
FOR THOSE TERMS HAS BEEN REQUESTED. THE REDACTED MATERIAL HAS BEEN SEPARATELY
FILED WITH THE SECURITIES AND EXCHANGE COMMISSION, AND THE TERMS HAVE BEEN
MARKED AT THE APPROPRIATE PLACE WITH TWO ASTERISKS (**).
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                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
Article                               Subject                               Page
-------                               -------                               ----
<S>       <C>                                                               <C>
   I.     Definitions....................................................     2

  II.     Transportation Service.........................................     8

  III.    Extension......................................................    13

  IV.     Interconnection Facilities.....................................    16

   V.     Rates..........................................................    17

  VI.     Term...........................................................    19

  VII.    Conditions.....................................................    20

 VIII.    Termination....................................................    26

  IX.     Indemnification................................................    27

   X.     Force Majeure..................................................    28

  IX.     Miscellaneous..................................................    28

          Signatures

          Exhibit "A"

          Exhibit "A-1"

          Exhibit "B"
</TABLE>

                                       -2-

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SPECIFIC TERMS IN THIS EXHIBIT HAVE BEEN REDACTED BECAUSE CONFIDENTIAL TREATMENT
FOR THOSE TERMS HAS BEEN REQUESTED. THE REDACTED MATERIAL HAS BEEN SEPARATELY
FILED WITH THE SECURITIES AND EXCHANGE COMMISSION, AND THE TERMS HAVE BEEN
MARKED AT THE APPROPRIATE PLACE WITH TWO ASTERISKS (**).

                          FIRM TRANSPORTATION AGREEMENT

                          RELATING TO SECTION 311(a)(2)

                      TRANSPORTATION OF NATURAL GAS IN THE

                               STATE OF LOUISIANA

     THIS AGREEMENT is made and entered into this 8th day of June, 2005, but
effective as of the Effective Date (as hereinafter defined), by and between
REGENCY INTRASTATE GAS LLC, a Delaware limited liability company
("Transporter"), and ANADARKO ENERGY SERVICES COMPANY, a Delaware corporation
("Shipper").

                                    RECITALS:

     Shipper has or will have natural gas available in Louisiana that is capable
of being delivered into Transporter's pipeline system.

     Shipper desires that Transporter transport natural gas for the account of
Shipper from a Point or Points of Receipt identified on Exhibit "A" to a Point
or Points of Delivery identified on Exhibit "A-1" to or for the account of
Shipper, all within the State of Louisiana.

     Transporter owns and operates an existing intrastate pipeline system within
the State of Louisiana, and Transporter is currently expanding the capacity of
that system by, among other things, looping two sections of the pipeline (the
"Expansion").

     Transporter also proposes to extend its existing intrastate pipeline from
its current terminus at Section 33, 17N, 6W Bienville Parish, Louisiana to a
proposed terminus near Winnsboro, Louisiana (the "Extension").

     Upon completion of the Extension, Transporter will have the ability in its
system to move natural gas on a Firm basis from the Shipper's desired Points of
Receipt to the Points of Delivery to or for the account of Shipper.

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     Transporter is of the opinion that the transaction referred to above falls
within Section 311(a)(2) of the NGPA (as hereinafter defined), and can be
accomplished without the prior approval of the FERC (as hereinafter defined),
and that such transaction will not cause Transporter to become regulated as a
"Natural Gas Company" within the meaning of the Natural Gas Act of 1938, as
amended.

     Transporter has on file with the FERC an Operating Statement pursuant to
Section 284.123(e) of the Regulations of FERC with respect to Section 311(a)(2)
of the NGPA, and this Agreement is subject to such Operating Statement.

     NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged and in consideration of the
premises and of the mutual covenants herein contained, the parties hereto
covenant and agree as follows:

                                   ARTICLE I.

                                   DEFINITIONS

     Section 1.01. Definitions. Except as otherwise herein provided, capitalized
terms used but not otherwise defined in this Agreement shall have the meanings
ascribed to them in this Section:

     "Affiliate" shall mean, when used with respect to a specified Person, any
other Person controlling, directly controlled by or under common control with
the specified Person. For purposes of this definition, "control," when used with
respect to any specified Person, shall mean the power to direct the management
and policies of the Person whether through the ownership of voting securities or
by contract; and the term "controlled" has the meanings correlative to the
foregoing.

     "British thermal unit" or "Btu" shall mean the amount of heat required to
raise the temperature of one avoirdupois pound of pure water from fifty-eight
and five-tenths degrees

                                       -4-

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(58.5 degrees) Fahrenheit to fifty-nine and five-tenths degrees (59.5 degrees)
Fahrenheit under standardized conditions.

     "Business Day" shall mean any Day of the week other than Saturday, Sunday
or a Day on which banks are authorized to close under federal law.

     "Commence Construction" shall mean, with respect to the Extension, that
Transporter shall become contractually bound to receive the pipe necessary to
construct the pipeline constituting the Extension and to obtain the right-of-way
necessary for the Extension and shall begin preparation of the right-of-way.

     "Commissioner" shall mean the Commissioner of Conservation of the State of
Louisiana or any successor to that governmental agency under the laws of the
State of Louisiana.

     "Completion Date" shall mean the first date, following completion of
construction of the Extension, on which Transporter is capable of receiving,
measuring and transporting Shipper's Demand Quantity on a Firm Basis from any
Point of Receipt to any Point of Delivery in accordance with the terms of this
Agreement.

     "Contract Year" shall mean the Year beginning at 9:00 a.m., Central Time,
on the first Day of the Month in which the Effective Date shall occur and ending
at 9:00 a.m., Central Time, on the first anniversary of such Day and each Year
thereafter.

     "Day" shall mean a period of twenty-four (24) consecutive hours beginning
and ending at 9:00 a.m., Central Time.

     "Deliveries" shall have the meaning ascribed to such term in Section 2.06.

     "Demand Quantity" shall mean a quantity of Gas having an aggregate Gross
Heating Value of 100,000 MMBtu per day, being the maximum quantity of Gas that
Transporter is obligated to accept and redeliver on any Day to a designated
Point of Delivery to Shipper or for

                                       -5-

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the account of Shipper pursuant to Transporter's Firm Transportation obligation
under this Agreement.

     "Effective Date" shall mean the first Day of the Month next following
Shipper's receipt of Transporter's written notice of the Completion Date
pursuant to Section 2.03(b) and shall be the date on which the parties hereto
intend that the initial deliveries of Gas shall be made by Shipper to
Transporter hereunder; provided, however, that, if the date such notice is
received is less than five (5) Business Days prior to the end of the then
current Month, the Effective Date shall be the first Day of the second Month
following the Month in which such notice is received.

     "Expansion" shall have the meaning ascribed to such term in the third
Recital to this Agreement.

     "Extension" shall have the meaning ascribed to such term in the fourth
Recital to this Agreement.

     "FERC" shall mean the Federal Energy Regulatory Commission and any
successor thereto or any other governmental agency or authority having
jurisdiction from time to time under the NGA or the NGPA.

     "Financing Commitment" shall mean a commitment, satisfactory in form and
substance to Transporter, issued by a financial institution of nationally
recognized reputation to provide debt financing for the construction of the
Extension in the amount of at least $77 million.

     "Firm" and "Firm Transportation" shall mean "Firm or Firm Service" as such
term is defined in the Operating Statement.

     "Force Majeure" shall have the meaning ascribed to such term in the second
paragraph of Section 15.1 of the Operating Statement, as that Section is
modified by Section 7.02(q) herein.

     "Fuel" shall mean Transporter's compressor fuel and equivalents and use
requirements and Gas lost and unaccounted for, as well as any incremental
compressor fuel incurred by Transporter

                                       -6-

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to compress the Gas in order to receive the Gas at the Points of Receipt or
deliver the Gas at the Points of Delivery.

     "Gas" and "Natural Gas" shall mean natural Gas as produced in its natural
state whether or not stored or processed prior to delivery, natural Gas or any
other component thereof that has been previously liquefied and restored to its
gaseous state prior to delivery to Shipper, Gas synthesized or manufactured from
oil, naphtha, coal or any other material that meets the quality standards
contained in this Agreement and which Transporter elects to deliver in lieu of
or commingled with one or more of the types of Gas described herein.

     "General Conditions" shall mean the General Conditions Applicable to
Transportation Agreements for Natural Gas in the State of Louisiana under
Section 311(a)(2) of the NGPA as attached to this Agreement as Exhibit "B."

     "Governmental Authority" shall mean (a) the United States of America or any
state or political subdivision thereof and (b) any court or any governmental or
administrative department, commission, board, bureau or agency of the United
States of America or of any state or political subdivision thereof.

     "Gross Heating Value" shall mean the gross number of British thermal units
produced by the complete combustion at constant pressure of the amount of Gas
saturated with water vapor that would occupy a volume of one (1) cubic foot at a
temperature of sixty (60) degrees Fahrenheit, under a pressure equivalent to
that of thirty (30) inches of mercury at thirty-two (32) degrees Fahrenheit and
under standard gravitational force with air of the same temperature and pressure
as the Gas when the products of combustion are cooled to the initial temperature
of the Gas and air and when the water formed by combustion is condensed to the
liquid state. The Gross Heating Value of the Gas thus obtained shall be
expressed on the measurement basis of 15.025 PSIA, as provided in this
Agreement, and shall be adjusted from a saturated basis to the actual moisture

                                       -7-

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content of the Gas actually delivered; provided, however, that, if the Gas as
delivered contains seven (7) pounds of water or less per one million (1,000,000)
cubic feet, such Gas will be deemed to be dry; and provided, further, that, if
the Gas as delivered contains more than seven (7) pounds of water per one
million (1,000,000) cubic feet, the Gross Heating Value of the Gas shall be
adjusted to an "as delivered" Btu content. Where a chromatograph is used instead
of a calorimeter, the Gross Heating Value shall be determined by analysis but
shall be on a basis equivalent to that set forth above.

     "Interruptible" or "Interruptible Transportation" shall mean "Interruptible
or Interruptible Service" as such term is defined in the Operating Statement.

     "Maximum Daily Transportation Quantity" shall mean the maximum quantity of
MMBtu's that Transporter is obligated, pursuant to the terms of this Agreement,
to accept and redeliver to or on behalf of Shipper on any Day. For Firm
Transportation service, this shall be the Demand Quantity, and, for
Interruptible Transportation service, this shall be the Interruptible Quantity.

     "Mcf" shall mean one thousand (1,000) cubic feet of Gas as determined on
the measurement basis set forth in Article B-1 of Exhibit "B" hereto.

     "MMBtu" shall mean, as a measure of the heat content of Gas, one million
(1,000,000) Btu's.

     "Month" shall mean the period beginning at 9:00 a.m., Central Time, on the
first day of a calendar month and ending at 9:00, a.m., Central Time, on the
first day of the next succeeding calendar month.

     "NGA" shall mean the Natural Gas Act of 1938, as amended.

     "NGPA" shall mean the Natural Gas Policy Act of 1978, as amended.

                                       -8-

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     "Operating Statement" shall mean the Operating Statement of Gulf States
Pipeline Corporation, the predecessor of Transporter, on file with the FERC
pursuant to Section 284.123(e) of the FERC's regulations implementing Section
311(a)(2) of the NGPA.

     "Overdelivery" shall have the meaning ascribed to such term in Section
2.06.

     "Points of Delivery" shall mean those points identified on Exhibit "A-1" as
Points of Delivery and such other points as the parties hereto may hereafter add
to Exhibit "A-1" by amendment.

     "Points of Receipt" shall mean those points identified on Exhibit "A" as
Points of Receipt and such other points as the parties hereto may hereafter add
to Exhibit "A" by amendment.

     "Primary Term" shall have the meaning ascribed to such term in Section
6.01.

     "Receipts" shall have the meaning ascribed to such term in Section 2.06.

     "Secondary Term" shall have the meaning ascribed to such term in Section
6.01.

     "Settlement Price" shall have the meaning ascribed to such term in Section
2.06.

     "Transportation Commitment" shall mean the Firm Transportation obligation
as provided herein, between Transporter and Shipper relating to the
transportation of Natural Gas by Transporter for the account of Shipper on
Transporter's intrastate pipeline system, as expanded by the Expansion and
extended by the Extension, for a specified amount of time (not to exceed ten
Years following the Effective Date).

     "Underdelivery" shall have the meaning ascribed to such term in Section
2.06.

     "Year" shall mean a period of three hundred sixty-five (365) consecutive
days; provided, however, that any such year that contains a date of February 29
shall consist of three hundred sixty-six (366) consecutive days.

     Section 1.02. Construction.

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     (a) Certain Words. As used in this Agreement unless expressly stated
otherwise or unless the context otherwise requires, (a) all references to an
"Article," "Section," or "subsection" shall be to an Article, Section or
subsection of this Agreement, (b) the words "this Agreement," "hereof,"
"hereunder," herein," "hereby" and words of similar import shall refer to this
Agreement as a whole and not to any particular Article, Section, subsection,
clause or other subdivision hereof, (c) the words herein shall include the
masculine, feminine and neuter genders, (d) the singular shall include the
plural and vice versa and (e) the word "including" shall mean "including without
limitation".

     (b) Headings. The headings of the Articles and Sections of this Agreement
and of the Exhibits hereto are included for conveniences only and shall not be
construed to be part of this Agreement or to affect the construction or
interpretation of the terms and provisions hereof.

                                   ARTICLE II.

                             TRANSPORTATION SERVICE

     2.01. Nature of Transportation Services. Commencing on the Effective Date
and subject to the provisions of this Agreement and the Operating Statement:

     (a) Deliveries to Transporter. Shipper shall deliver to Transporter or
cause to be delivered to Transporter for Shipper's account each Day:

          (i) On a Firm Transportation basis, a quantity of Gas with an
aggregate Gross Heating Value of up to 100,000 MMBtu's; and

          (ii) at Shipper's election, on an Interruptible Transportation basis,
a quantity of Gas with an aggregate Gross Heating Value of up to 100,000
MMBtu's;

provided, however, that Transporter shall not be obligated to receive or deliver
Gas in any hour at a rate exceeding the actual nominated daily quantities
divided by 24. The parties hereto intend that any quantity of Gas delivered by
Shipper to Transporter on any Day up to 100,000 MMBtu's shall

                                      -10-

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be deemed to be delivered for Firm Transportation and any quantity of Gas so
delivered on that Day in excess of 100,000 MMBtu's (up to an aggregate of
200,000 MMBtu's) shall be deemed to be delivered for Interruptible
Transportation.

     (b) Deliveries by Transporter. Transporter shall redeliver or cause to be
redelivered to Shipper or for Shipper's account each Day:

          (i) On a Firm Transportation basis, the quantity of Gas actually
nominated for Firm Transportation that Day by Shipper to be delivered at that
Point of Delivery but not to exceed the lesser of (1) the quantity of Gas
specified for such Point of Delivery on a Firm Transportation basis on Exhibit
"A-1" and (2) the cumulative total of the quantities of Gas delivered for Firm
Transportation that Day by Shipper or for its account at all Points of Receipt;
and

          (ii) on an Interruptible Transportation basis, the quantity of Gas
actually nominated for Interruptible Transportation that Day by Shipper to be
delivered at that Point of Delivery but not to exceed the lesser of (1) the
quantity of Gas specified for such Point of Delivery on an Interruptible
Transportation basis on Exhibit "A-1" and (2) the cumulative total of the
quantities of Gas delivered for Interruptible Transportation that Day by Shipper
or for its account at all Points of Receipt.

     (c) Authorized Overrun Quantities. Upon request of Shipper, Transporter
may, in its sole discretion, accept at Points of Receipt and redeliver to Points
of Delivery quantities greater than the total of the Demand Quantity and the
Interruptible Quantity on any Day subject to the Interruptible Transportation
charge outlined in 5.01(a)(ii) below. Any such quantity so accepted or
redelivered shall constitute an "Authorized Overrun Quantity."

     (d) Operating Statement. Shipper acknowledges receipt of a copy of the
Operating Statement currently on file with the FERC. Transportation service
shall be in accordance with this Agreement and with the Operating Statement
which is, as modified by Article VII herein,

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expressly incorporated herein. In the case of any conflict between this
Agreement and the Operating Statement, the terms and conditions contained in
this Agreement shall control.

     Section 2.02. Basis of Services. Transportation services hereunder are
provided on a Firm basis for the Demand Quantity, on an Interruptible basis for
the Interruptible Quantity and on an Interruptible basis for any Authorized
Overrun Quantities, and in the latter two instances interruption shall be as
provided in the Operating Statement. Firm Transportation service hereunder shall
be subject to curtailment or interruption as provided in Section 15 (Force
Majeure) and Section 6 (Priority of Service) of the Operating Statement.

     Section 2.03. Commencement of Services.

     (a) Commencement. The transportation services hereunder shall commence on
the Effective Date as defined in Section 1.01.

     (b) Completion Date. Transporter estimates that the Completion Date will
occur on or before March 1, 2006. Transporter shall give written notice to
Shipper of the occurrence of the Completion Date not later than the tenth (10th)
Business Day after the occurrence thereof.

     Section 2.04. Rights of Transporter to Possession of Gas. It is understood
and agreed that, upon receipt of the Gas by Transporter at the Points of Receipt
hereunder, Transporter shall, subject to Transporter's obligation to redeliver
Gas as specified in Section 2.01, have the absolute and unqualified right to
treat such Gas as its own, including the right to commingle such Gas, to
redeliver molecules different from those received, and to treat the molecules
delivered in any manner.

     Section 2.05. Conditions. The Gas shall be delivered by Shipper to
Transporter at the Points of Receipt under the conditions of quality set forth
in Article B-II of the General Conditions and under conditions of pressure as
provided in Section 9.1 of the Operating Statement; provided,

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however, that Shipper shall not be required to deliver the Gas at any pressure
greater than 950 Psig (as such term is defined in the Operating Statement).

     Section 2.06. Imbalances. It is the intent of Transporter and Shipper that
any difference, or imbalance, between the quantities of Gas delivered by Shipper
at the Point(s) of Receipt and the quantities of Gas taken by Shipper at the
Point(s) of Delivery be minimal and incidental. If an imbalance exists at the
end of any Month, then both Transporter and Shipper agree that the imbalance
will be settled between Shipper and Transporter as provided in this Section. If
Shipper's deliveries of Gas to Transporter at the Point(s) of Receipt
("Receipts") in a Month are greater than Transporter's re-deliveries of Gas to
Shipper at the Point(s) of Delivery ("Deliveries") in that Month, the quantity
remaining after subtracting Deliveries from Receipts being an "Overdelivery",
Transporter shall pay Shipper an amount of money equal to (i) the quantity of
the Overdelivery, in MMBtu's, times (ii) the monthly price per MMBtu charged to
Transporter by the pipeline receiving Shipper's Gas at the Point of Delivery
("Downstream Pipeline") for the settlement of all imbalances with Transporter
occurring at the Point of Delivery for the same Month the Gas is delivered under
this Agreement (the "Settlement Price"). If Deliveries in a Month are greater
than Receipts in that Month, the quantity remaining after subtracting Receipts
from Deliveries being an "Underdelivery", Shipper shall pay Transporter an
amount of money equal to (i) the quantity of the Underdelivery, in MMBtu's,
times (ii) the Settlement Price. If Shipper ships Gas to multiple Points of
Delivery, the price shall be the weighted average of the Settlement Prices
charged to Transporter by the Downstream Pipelines on which Shipper's quantities
were confirmed, based on the quantities confirmed with each Downsteam Pipeline
on Shipper's behalf. The quantity of the Overdelivery or Underdelivery for each
Delivery Point will be shown on Shipper's monthly statement as provided in
Section 16 of

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the Operating Statement, and the values of the aggregate Overdeliveries and
Underdeliveries shall be netted for the purpose of imbalance settlement.

     Section 2.07. Conversion Option. Shipper shall have the option exercisable
at any time during the Primary Term or, if this Agreement is extended, during
the Secondary Term, to convert all or any part of the Interruptible
Transportation service provided hereunder to Firm Transportation service. This
right of Shipper shall be exercisable only to the extent that Transporter shall
determine that it has sufficient available and uncommitted capacity to perform
the service requested by Shipper. Subject to Shipper's rights under Article VII
Section 7.02(i) herein, Transporter shall, to the extent permitted by applicable
laws and regulations, advise Shipper from time to time as to the available and
uncommitted capacity on the Extension. Shipper's option under this Section may
only be exercised by written notice given by Shipper to Transporter not less
than 30 Days and not more than 90 Days in advance of the requested date of
initiation of the requested Firm Transportation service which shall be the first
Day of a Month. To the extent Shipper's option under this Section is exercised,
(a) the terms and conditions of such additional Firm Transportation service
shall be those provided herein for Firm Transportation service generally
(including the charges set forth in Section 5.01(a)(i)(aa)) and (b) the
obligation of Transporter to provide Interruptible Transportation service
hereunder shall be reduced commensurately.

     Section 2.08. Most Favored Nation Treatment. Notwithstanding the provisions
of Section 5.01(a)(i), Transporter will make available to Shipper Firm
Transportation for the quantities of Gas specified in Section 2.01(a)(i) and
2.07 of this Agreement at prices no less favorable than the prices agreed to by
third party shippers for Firm Transportation on the Transporter's intrastate
pipeline for movements of quantities of Gas substantially similar to those

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movements and quantities for which Transporter has agreed to provide Firm
Transportation services to Shipper hereunder.

     Section 2.09. Odorization. Transporter covenants and agrees to be
responsible for any and all odorization of Gas delivered by or for the account
of Shipper to Transporter hereunder that is or may be required by any statute,
ordinance, rule or regulation, and that Transporter shall construct, maintain
and operate any facilities required for the performance of this obligation.
Transporter agrees that Shipper shall have no obligation to odorize the Gas
transported and redelivered hereunder.

     Section 2.10. Abandonment. Without admitting to or acquiescing in the
jurisdiction of the Commissioner of Conservation of the State of Louisiana over
this Agreement pursuant to the provisions of LSA R.S. 30:555(b) or of any body
either State or Federal and reserving all rights with respect thereto,
Transporter and Shipper contract and agree that each party will, in support of
any application of the other, seek pre-granted approval for the abandonment of
service under this Agreement at the termination of this Agreement by the
Assistant Secretary of the Department of Natural Resources for the State of
Louisiana, or any other body or successor, either Federal or State, that may
have or assert jurisdiction over the service provided under this Agreement.
Shipper and Transporter confirm to each other that the cessation of service at
the termination of this Agreement is an important consideration to each, and to
this end, both contract and agree with the other that neither will take any
action that may be construed by any regulatory official or body that has
jurisdiction as a basis for requiring deliveries of Gas by Transporter to
Shipper after the termination of this Agreement. Both agree that at all times
they will take appropriate action, and cooperate with the other, to the end that
delivery of Gas hereunder may be abandoned at the termination of this Agreement
and both agree that the termination of this Agreement, for whatever reason shall
constitute authority to abandon service hereunder.

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                                  ARTICLE III.

                                    EXTENSION

     Section 3.01. Facilities Construction. Shipper acknowledges that
Transporter's facilities and equipment are not currently in place in order to
provide the service contemplated hereunder.

     Section 3.02. Extension Project.

     (a) Preliminary Preparations. Transporter shall, upon execution and
delivery of this Agreement, continue, with due diligence and in a timely
fashion, to design and engineer the construction of the Extension and to seek
such contract rights, to procure such materials and supplies, to make such
financial arrangements, to seek such environmental and other governmental
permits and approvals and to make such other preparations as are necessary and
desirable in order to enable it to construct the Extension; provided, however,
that Shipper acknowledges that Transporter has not yet obtained a Financing
Commitment or Commenced Construction of the Extension and that, until the
conditions precedent set forth in Section 3.03 have been fulfilled or waived,
Transporter shall not be obligated hereunder to Commence Construction, i.e., to
commit contractually to purchase the pipe or to obtain the rights-of-way
necessary for construction of the Extension.

     (b) Transporter covenants and agrees that it will (i) use all commercially
reasonable efforts to fulfill the conditions precedent set forth in subsections
(a), (b), (c) and (d) of Section 3.03 and (ii), upon satisfaction or waiver of
the conditions precedent set forth in Section 3.03 and subject to Force Majeure,
Commence Construction and use all commercially reasonable efforts to initiate
and prosecute diligently construction of the Extension with the objective of
achieving the Completion Date on or before March 1, 2006. Shipper acknowledges
that the obligations of Transporter set forth in the immediately preceding
sentence are limited to the performance of

                                      -16-

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commercially reasonable efforts (i) to obtain the Transportation Commitments and
the Financing Commitment and (ii) to complete construction of the Extension.

     Section 3.03. Conditions Precedent. The obligation of Transporter to
Commence Construction of the Extension is subject to the satisfaction of each of
the following conditions, any of which may be waived in its sole discretion:

     (a) Transporter shall have received Transportation Commitments,
satisfactory in form and substance to Transporter, with respect to the Firm
Transportation of at least 100,000 MMBtu's of Gas per Day.

     (b) Transporter shall have received one or more Financial Commitments,
satisfactory in form and substance to Transporter, with respect to the provision
of financing for the Extension in an amount of at least $77 million.

     (c) Transporter shall have received all permits and licenses under any
federal, state or local environmental law that it is required to have, by
statute, by applicable rule or regulation of any Governmental Authority,
including Section 311 of the NGPA, or otherwise, prior to Commencing
Construction of the Extension.

     (d) Transporter shall have made all filings and applications with, and
shall have received all certificates, permits, authorizations and approvals, in
form and substance satisfactory to Transporter, from each Governmental
Authority, including the FERC, having jurisdiction in order for Transporter (i)
to own, construct, operate and maintain the Extension and any necessary related
facilities, including any leased facilities, and (ii) to render the Firm
Transportation services to Shipper at market based rates on the terms and
subject to the conditions set forth herein.

     (e) Transporter shall have received unconditional approval of construction
of the Extension from its Board of Directors or, if Transporter's Board of
Directors shall have approved

                                      -17-

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construction of the Extension subject to one or more conditions, all of such
conditions shall have been fulfilled.

     Section 3.04. Notice. Upon satisfaction or waiver of all the conditions
precedent set forth in Section 3.03, Transporter will, within ten (10) Business
Days thereafter, provide notice to Shipper of that fact. If those conditions
precedent have not been fulfilled or waived on or before October 3, 2005 or if
the Completion Date has not occurred on or before March 1, 2006, either party
hereto may terminate this Agreement in accordance with Section 8.01.

     Section 3.05. Cooperation. Each party shall cooperate with the other with
respect to the preparation and filing of any regulatory applications with any
Governmental Authority having jurisdiction that may be necessary to implement or
continue this Agreement.

                                   ARTICLE IV

                           INTERCONNECTION FACILITIES

     Section 4.01. Points of Receipt. Prior to the Completion Date, Transporter
shall install, own, operate and maintain, or cause the same to be done, at the
Points of Receipt and Delivery designated on Exhibit "A" and Exhibit "A-1" the
meter, instruments, equipment, and surface leases necessary to receive the Gas
under this Agreement. Installation and operation of meters, instruments and
other measurement equipment shall be in accordance with Article B-I of the
General Conditions of Exhibit "B" as determined by Transporter in Transporter's
reasonable judgment. The Point of Receipt designated on Exhibit "A" as the Caney
Lake Central Delivery Point shall be designed and constructed with a capability
of receiving 250,000 MMBtu per Day, and Transporter shall be responsible for the
payment of the cost of installation of such equipment and facilities at the
Caney Lake Point of Receipt. Additional Points of Receipt shall be installed
along the Extension at the request of Shipper, but Shipper shall be responsible
for the payment of the cost of installation of such equipment and facilities at
any such additional Points of Receipt.

                                      -18-

<PAGE>

Shipper will request in writing that Transporter provide a cost estimate for the
connection of any additional Points of Receipt along with an estimated date of
completion. Upon written authorization by Shipper to Transporter of the
acceptance of the cost estimate, Transporter will begin construction of the
additional facilities necessary to accommodate any additional Points of Receipt.
Following completion of equipment and facilities at any additional Points of
Receipt, Transporter shall provide Shipper a statement, along with appropriate
supporting documentation, showing Transporter's total cost (including labor,
materials, overhead, and interest) for the additional Points of Receipt,
including the surface lease, equipment, facilities and the cost of tapping
Transporter's line. All indirect costs, including general overhead, and carrying
costs shall be allocated consistent with accounting practices applied to
projects for the sole account of Transporter. Within thirty (30) days following
receipt of such statement and supporting documentation, Shipper shall pay
Transporter the amount due in the statement.

     Section 4.02. Points of Delivery. Prior to the Completion Date, Transporter
shall install, own, operate and maintain, or cause the same to be done, at the
Points of Delivery designated on Exhibit "A-1" the meter, instruments,
equipment, and surface leases necessary to deliver the Gas under this Agreement;
provided, however, that installation of the interconnection at the Point of
Delivery relating to Louisiana Intrastate Gas Company ("LIG") is subject to
acceptance of that interconnection by LIG. Installation and operation of meters,
instruments and other measurement equipment shall be in accordance with Article
B-I of the General Conditions of Exhibit "B" as determined by Transporter in
Transporter's reasonable judgment. Transporter shall be responsible for the
payment of the cost of installation of such equipment and facilities at the
proposed Points of Delivery.

     Section 4.03. Ownership. Equipment and facilities installed by Transporter,
together with any buildings erected by it for such equipment, shall be and
remain Transporter's property.

                                      -19-

<PAGE>

                                   ARTICLE V.

                                      RATES

     Section 5.01. Charges.

     (a) Shipper shall for each Month pay Transporter:

          (i) (aa) With respect to Firm Transportation services hereunder and as
a reservation charge for such services, an amount equal to the lesser of (1) the
Demand Quantity times ** per MMBtu during the Primary Term or ** during
the Secondary Term (if any) times the number of Days in such Month or (2) the
Demand Quantity times Transporter's then effective maximum rates for Firm
311(a)(2) transportation service per MMBtu times the number of Days in such
Month. Unless the rate changes to reflect a demand/commodity structure upon a
change in accordance with Section 2.08, there shall be no commodity charge with
respect to Firm Transportation services under this subsection (i)(aa).

               (bb) Notwithstanding the rate for Firm Transportation set forth
in paragraph (aa) in this Section, at such time during the Primary Term of this
Agreement that Shipper, as an Anchor Shipper as such term is defined in Section
7.02(a)1.36 herein, delivers a total quantity of natural gas at the Delivery
Points equal to 182,500,000 MMBtu, the reservation charge for Firm
Transportation services for the Demand Quantity for the remainder of the Primary
Term will be the lesser of (1) the Demand Quantity times ** per MMBtu times
the number of Days in such Month, or (2) the Demand Quantity times Transporter's
then effective maximum reservation charge for Firm 311(a)(2) transportation
service per MMBtu times the number of Days in such Month. The commodity charge
for Firm Transportation for the Demand Quantity during the remainder of the
Primary Term will be the lesser of (1) the quantity of gas in MMBtu that is
delivered at the Delivery Points times ** per MMBtu, or (2) the quantity of
gas in MMBtu that is delivered at the Delivery Points times Transporter's then
effective maximum commodity charge

                                      -20-

<PAGE>

for Firm 311(a)(2) transportation service per MMBtu. This subsection (i)(bb)
shall have no application to rates for Firm or Interruptible Transportation
services during the Secondary Term, if any, or with respect to rates for Firm
Transportation services provided pursuant to the exercise of the conversion
option set forth in Section 2.07.

          (ii) With respect to Interruptible Transportation services hereunder
and as an Interruptible Transportation charge, an amount each Month equal to the
lesser of (1) the actual quantity of Gas delivered to Transporter on an
Interruptible Transportation basis during the immediately preceding Month times
** per MMBtu during the Primary Term or ** during the Secondary Term (if
any) or (2) the actual quantity of Gas delivered to Transporter on an
Interruptible Transportation basis during the immediately preceding Month times
Transporter's then effective maximum rates for Firm 311(a)(2) transportation
service. Additionally, this Interruptible Transportation Charge will apply to
Authorized Overruns.

     (b) The parties hereto acknowledge that Shipper's Point of Delivery is
downstream of Transporter's compression stations and they therefore agree that
Fuel and Loss allocation shall be **%.

     (c) Shipper and Transporter shall each also make all other payments as
required by the Operating Statement.

     Section 5.02. Operating Statement Changes. Transporter shall provide
Shipper with a copy of each Operating Statement upon the filing of each
Statement with the FERC.

     Section 5.03. Louisiana Natural Gas Franchise Tax. Transporter and Shipper
recognize that the transportation fee per MMBtu specified in this Agreement
takes into account the Louisiana Natural Gas Franchise Tax of 1% as applied to
the business of Transporter represented by this Agreement. If after the date
hereof the Louisiana Natural Gas Franchise Tax is increased or there is levied
by law an additional tax, charge or fee (other than an income tax) on or
measured by

                                      -21-

<PAGE>

sales, the movement, the value or the quantity of Gas delivered to or for the
account of Shipper and the tax is payable by Transporter for the right to sell
or transport Gas, then Shipper shall, if Transporter lawfully pays such tax,
reimburse Transporter for that portion of the tax, charge or fee paid by
Transporter that is attributable under generally accepted accounting principles
to that part of Transporter's business represented by this Agreement. Shipper
shall be responsible for all taxes, charges and fees of whatever kind due or
payable on the production or gathering of the Gas and the transportation of the
Gas prior to the receipt of such Gas by Transporter at the Points of Receipt and
subsequent to the delivery of such Gas by Transporter at the Points of Delivery.

     Section 5.04. Intervention in Proceedings. Shipper shall have the right, at
its option, to intervene in any proceeding held to consider any change in the
Operating Statement, either to oppose any change to the Operating Statement or
to seek relief therefrom, or both.

     Section 5.05. Reimbursement Obligations. Shipper agrees to reimburse
Transporter for all charges (except those occurring as a result of Transporter's
negligence, willful misconduct or breach of this Agreement) that Transporter
incurs from other parties in rendering service for Shipper, including penalties
of any kind, imbalance cash outs, whether imposed pursuant to a transportation
service agreement, operational balancing agreement or otherwise, which charges
are related to the transportation service rendered to Shipper by Transporter
under this Agreement.

                                   ARTICLE VI.

                                      TERM

     Section 6.01. Term. This Agreement shall become binding on the parties
hereto on the date first hereinabove written and, subject to the express
provisions contained herein relating to earlier termination, shall remain in
full force for a term of five (5) Contract Years following the Effective Date
(the "Primary Term"). At the election of Shipper, exercised by notice from
Shipper to Transporter given during the final Contract Year of the Primary Term
but no later than the 90th

                                      -22-

<PAGE>

Day prior to the end of that Contract Year, the term of this Agreement may be
extended beyond the Primary Term for an additional five (5) Contract Years (the
"Secondary Term").

     Section 6.02. Specific Regulatory Provisions. Transporter is a Louisiana
intrastate pipeline serving intrastate shippers, and Transporter also provides
service to parties shipping natural gas in interstate commerce pursuant to NGPA
Section 311 and to Part 284 of the FERC's regulations. Transporter does not
anticipate any change to its current jurisdictional status during the term of
this Agreement. If, however, there is a change in Transporter's jurisdictional
status during the term of this Agreement, where such change either requires or
makes it desirable for Transporter to enter into new transportation agreements,
Shipper and Transporter agree to renegotiate, in good faith, the terms and
conditions of this Agreement. Such renegotiated Agreement or new agreement will
reflect Transporter's and Shipper's best efforts to retain, to the greatest
extent possible, the mutual benefits and obligations between Transporter and
Shipper as those benefits and obligations existed immediately prior to any new
rate, condition of service or other new obligation imposed upon Transporter as a
result of a change in jurisdiction. If, however, the terms of any such
renegotiated or new agreement would, taken as a whole, be materially adverse to
Shipper, Shipper shall have the right to terminate this Agreement and to decline
to enter into any such renegotiated or new agreement.

                                  ARTICLE VII.

                                   CONDITIONS

     Section 7.01. General Conditions. This Agreement is subject to
Transporter's General Conditions, a copy of which is attached hereto and made
part hereof as Exhibit "B". provided, however, that, in the event of a conflict
between any provision of Transporter's General Conditions and any provision of
this Agreement, this Agreement shall govern; and provided, further, that, as so
incorporated herein, it is modified in accordance with the following provisions
of this Section:

                                      -23-

<PAGE>

     (a) Article B-II(d) Carbon Dioxide - is modified by adding thereto the
following sentence: "Shipper and Transporter agree that as long as the carbon
dioxide content of Shipper's Gas is less than 2.5 mole percent, Transporter will
use reasonable efforts to accept and blend the full volume of Shipper's Gas."

     Section 7.02. Operating Statement. As set forth in Section 2.01(d), the
Operating Statement is incorporated herein by reference; provided, however,
that, in the event of a conflict between any provision of the Operating
Statement and any provision of this Agreement, this Agreement shall govern; and
provided, further, that, as so incorporated herein, it is modified in accordance
with the following provisions of this Section:

     (a) Article I. Article I of the Operating Statement is modified by adding
thereto the following definitions:

          1.35 Anchor Agreement shall mean that Firm Service Transportation
          Agreement between Transporter and Anchor Shipper executed prior to
          June 9, 2005, specifying delivery, for transportation on the Extension
          and on a Firm Transportation basis, of at least 100,000 MMBtu per Day
          or more and a term of five (5) years or more, which Agreement
          qualifies the Shipper as an Anchor Shipper. Except where specifically
          referred to herein as an "Anchor Agreement," the Anchor Agreement
          shall also qualify as an Agreement or Transportation Agreement.

          1.36 Anchor Shipper shall mean a Shipper with a Firm Service
          Transportation Agreement executed prior to June 9, 2005, which Firm
          Service Transportation Agreement specifies delivery, for
          transportation on the Extension and on a Firm Transportation basis, of
          at least 100,000 MMBtu per Day or more and a term of five (5) years or
          more. Except

                                      -24-

<PAGE>

          where specifically referred to herein as an "Anchor Shipper," the
          Anchor Shipper shall also qualify as a Shipper.

          1.37. Posted Firm Capacity shall mean that firm capacity, posted on
          Transporter's website pursuant to Section 5.1 of the Operating
          Statement, that Transporter determines is currently or prospectively
          available to provide new Firm Transportation service.

     (b) Section 1.5. Section 1.5 of the Operating Statement is modified to
change the reference therein from 7:00 a. m. to 9:00 a. m.

     (c) Section 1.29. Section 1.29 of the Operating Statement is modified so as
to be and read in its entirety as follows: "Scheduling Deviation shall mean the
amount of natural gas constituting the payable or receivable imbalance
determined in accordance with subsection (e) of Section 18."

     (d) Section 1.30. Section 1.30 of the Operating Statement is modified so as
to be and read in its entirety as follows: "Scheduling Fee shall mean the amount
of cash to be paid with respect to a payable or receivable natural gas imbalance
pursuant to subsection (e) of Section 18."

     (e) Section 2.2. Section 2.2 of the Operating Statement is modified by
adding thereto, after the text ". . .subjects either party or any of
Transporter's pipeline or related facilities to any greater or different
regulation or jurisdiction than that existing on the date the Agreement is
executed (or thereafter as such regulation or jurisdiction may have changed and
been accepted by such party) . . .," the phrase "and such greater or different
regulation or jurisdiction shall have materially reduced the benefits of the
Agreement to such party".

     (f) Section 4.1(c). Section 4.1(c) of the Operating Statement is modified
by adding thereto the following sentence: "If the actual volume of Gas received
by Transporter during any

                                      -25-

<PAGE>

Day differs from the Scheduled Volume, Transporter shall only be obligated to
deliver the lesser of the actual volume received or the Scheduled Volume.

     (g) Section 5.1. The introductory paragraph of Section 5.1 of the Operating
Statement is modified by adding thereto a first sentence which shall be and
read, in its entirety, as follows: "From time to time, subject to Transporter
having available capacity, Transporter will offer transportation services to
prospective shippers on a non-discriminatory basis. Transporter will post, on
its website, a description of such available capacity. A party desiring
transportation service from Transporter may request such service pursuant to the
following terms and conditions. Transporter may, in its discretion and on a
non-discriminatory basis, reject bids for service that propose payment of less
than the maximum rate for the transportation service requested. Posted Firm
Capacity is potentially subject to Anchor Shipper's Right of First Refusal."

     (h) Section 5.1 (f). Subsection (f) of Section 5.1 of the Operating
Statement is modified so as to be and read, in its entirety, as follow:

          (f) Identification of Party: Identification of the interstate pipeline
          or LDC served by an interstate pipeline that shall serve as the "on
          behalf of" party;

     (i) Article V of the Operating Statement shall be modified by adding
thereto new Sections 5.4, 5.5 and 5.6 which shall be and read, in their
entirety, as follows:

               5.4 Valuation of Bid: Without undue discrimination or preference,
          Transporter shall evaluate all valid requests for transportation
          service from an operational and net present value standpoint and
          shall, in accordance with the further terms and conditions hereof,
          advise the prospective shipper whether and to what extent a request
          for transportation

                                      -26-

<PAGE>

          service is confirmed or rejected. Except in those cases involving
          Anchor Shipper's exercise of a Right of First Refusal, where parties
          seeking transportation service from Transporter make bids that are
          equivalent to one another on a net present value basis, available
          transportation hereunder will be allocated on a first come, first
          served basis.

          5.5 Transportation Agreement: A Transportation Agreement shall be
          executed by Shipper and Transporter following Transporter's acceptance
          of Shipper's request for service and, where applicable, Anchor Shipper
          has not exercised its Right of First Refusal over the request for
          service.

          5.6 Anchor Shipper Right Of First Refusal

          a. ROFR: Any bid for Posted Firm Capacity, where the term of such bid
          or request is one (1) year or longer, shall be subject to a Right of
          First Refusal ("ROFR") in favor of Anchor Shipper(s). Anchor
          Shipper(s)' ROFR rights shall be exercised in the following manner:

          b. Bids Subject to ROFR Rights: Any party making a bid for some or all
          of the Posted Firm Capacity shall request service from Transporter
          pursuant to the terms and procedures required under this Section 5.
          Once such a bid has been received, Transporter will seek to verify
          that the bidder is qualified to take service from Transporter and that
          the bid is otherwise acceptable to Transporter. When the bid and all
          required documentation is submitted to Transporter, a decision
          regarding bidder's qualification for Firm Service will be made within
          thirty (30) days of bidder's completed submission to Transporter.

          c. Exercise of ROFR Rights: If Transporter determines that both the

                                      -27-

<PAGE>

          bid and the bidder are acceptable to Transporter, that information
          shall be communicated to the bidder and will also be communicated to
          Anchor Shipper(s). Transporter shall advise both the bidder and the
          Anchor Shipper(s) of the terms of the bid and its calculation of the
          net present value of the bid. Once that posting has been made, the
          Anchor Shipper(s) has until 5:00 pm CST on the fifth (5th) business
          day following the receipt by Anchor Shipper(s) of the bid and related
          information to determine whether it will take service under precisely
          the same terms proposed by the bidder, and to communicate that
          decision to Transporter. Subject to Section 5.6(d), the Anchor Shipper
          willing to accept the agreement on the bidder's terms will be deemed
          the winner of that capacity.

     (j) Section 7.1. Unless there is a change in the demand/commodity rate
structure as otherwise provided in this Agreement, the Commodity Fee in this
Agreement is $0.00.

     (k) Section 7.1(c). Section 7.1 is modified by adding thereto a new
subsection (c) which shall be and read, in its entirety, as follows:

               (c) If an Anchor Shipper shall be rendered unable, wholly or in
          part, to deliver the whole or any part of the Maximum Daily
          Transportation Quantity on any Day by reason of the failure of surface
          production equipment due to force majeure or any other cause of any
          kind not reasonably within its control (the "Firm Delivery
          Shortfall"), the Anchor Shipper shall nonetheless continue to be
          liable for any Reservation Fee provided in the Anchor Agreement
          applicable to the Firm Delivery Shortfall, but such Shipper may,
          subject to applicable nominations and scheduling provisions contained
          in this Operating Statement or in the Anchor Agreement, on any
          subsequent Day during the Primary Term or, if this Agreement has been
          extended,

                                      -28-

<PAGE>

          the Secondary Term ship all or any portion of the Firm Delivery
          Shortfall; provided, however, that Transporter shall determine that it
          has sufficient available and uncommitted capacity to perform the
          service requested by Anchor Shipper.

     (l) Section 7.4. The provisions of Section 7.4 of the Operating Statement
are subject to the provisions of Section 5.03 of this Agreement.

     (m) Section 8.1. The provisions of Section 8.1 of the Operating Statement
are replaced by the provisions of Article B-II (Quality) of the General
Conditions.

     (o) Section 10.4. The provisions of the second paragraph of Section 10.4 of
the Operating Statement, including subparagraphs (a) to (m), inclusive, are
replaced by the provisions of Article B-I (Measurement and Tests) of the General
Conditions.

     (p) Section 12.2. Section 12.2 of the Operating Statement is modified by
substituting the following for Section 12.2 in its entirety:

          12.2 Shipper represents and warrants to Transporter that the
          transportation of Gas under this Agreement shall be on behalf of an
          interstate pipeline, or on behalf of an LDC served by an interstate
          pipeline, as contemplated under Section 311 of the NGPA and the
          regulations implementing Section 311.

     (q) Section 15.1. The second paragraph of Section 15.1 of the Operating
Statement is modified so as to add thereto a new clause (c) which shall be and
read, in its entirety, as follows:

               (c) in those instances where either Transporter or Shipper is
          required to construct facilities to enable such party to fulfill its
          obligations under the Agreement, any interruptions or delays on the
          part of that party in completing the construction of such facilities
          occasioned by any legal or regulatory proceeding.

                                      -29-

<PAGE>

     (r) Section 16.2(e). Section 16.2(e) of the Operating Statement is modified
by substituting "Wells Fargo Bank, N.A., Dallas, Texas" for "NationsBank-NA."

     Section 7.03. Transporter agrees to use all commercially reasonable efforts
to amend its existing Operating Statement so that as amended it will reflect
each of the modifications to the terms thereof reflected in Section 7.02 of this
Agreement.

                                  ARTICLE VIII.

                                   TERMINATION

     Section 8.01. Termination. This Agreement may be terminated and the
transactions contemplated hereby abandoned in accordance with the following
provisions:

     (a) The parties hereto may elect to terminate this Agreement at any time by
mutual written consent;

     (b) subject in any case to the provisions of Article X, either party hereto
may elect to terminate this Agreement by notice to the other party expressly so
stating if the conditions precedent set forth in Section 3.03 have not been
fulfilled or waived on or before October 3, 2005, and Shipper may also elect to
terminate this Agreement if it has not received, on or before October 17, 2005,
the notice prescribed by Section 3.05 that the conditions precedent set forth in
Section 3.04 have been fulfilled or waived;

     (c) subject in any case to the provisions of Article X, either party hereto
may elect to terminate this Agreement by notice to the other party expressly so
stating if the Completion Date has not occurred on or before March 1, 2006, and
Shipper may also elect to terminate this Agreement if it has not received, on or
before March 14, 2006, notice that the Completion Date has occurred.

                                   ARTICLE IX.

                   INDEMNIFICATION AND LIMITATION OF LIABILITY

                                      -30-

<PAGE>

     Section 9.01. Indemnification. Each party hereto shall indemnify and hold
the other party hereto and its subsidiaries, Affiliates, directors, officers and
employees harmless from and against any claims for damages to property, injuries
to or death of persons arising out of or in any way attributable to the
operations conducted by such party, including the failure of any equipment owned
or operated by such party hereunder.

     Section 9.02. Limitation of Liability. In no event shall a party hereto be
liable to the other party for any special, indirect, incidental, or
consequential damages of any character, including loss of use, lost profits or
revenues, cost of capital, cancellation of permits, termination of contracts,
tort or contract claims other than contract claims arising out of this
Agreement, or any other form of consequential damage suffered by such party, and
irrespective of whether claims for such damages are based upon contract,
warranty, negligence, strict liability or otherwise. Neither party shall be
liable to the other for exemplary or punitive damages.

                                   ARTICLE X.

                                  FORCE MAJEURE

     Section 10.01. Force Majeure. Any failure of either party hereto to perform
any of its obligations hereunder, other than to make payments when due, shall be
excused if such failure is due to Force Majeure; provided, however, that the
party suffering such Force Majeure shall give notice and reasonably full
particulars to the other party as soon as possible upon the occurrence of such
event and shall use all commercially reasonable efforts to remedy so far as
possible the cause of the failure (other than strikes and lockouts). The
settlement of strikes and lockouts shall be entirely within the discretion of
the party that is subject thereto, and the foregoing requirement to remedy the
cause of Force Majeure shall not require the settlement of strikes or lockouts
by acceding to the demands of the opposing party when that course is inadvisable
in the discretion of the party subject thereto. It is understood that either
party hereto may, without liability to the other

                                      -31-

<PAGE>

party, interrupt the operations of its pipeline system, compressors and other
equipment for the purpose of making necessary alterations or repairs thereto,
but that such interruption shall be for only such time as may be reasonable. The
party interrupting operations shall give the other party reasonable notice,
except in the case of emergency, of its intention so to interrupt operations and
of the estimated time thereof. If, following the Completion Date, Transporter's
obligations to provide Firm Transportation services hereunder are excused
because of an event of Force Majeure, Shipper shall be excused from paying the
charges provided under Section 5.01(a)(i) so long as the event of Force Majeure
continues. The provisions of this Section 10.01 shall be deemed to be in
addition to and expansive of, and not in conflict with, the provisions of
Section 15 of the Operating Statement.

                                   ARTICLE XI.

                                  MISCELLANEOUS

     Section 11.01. Notices and Addresses. Any notice, request, instruction,
consent, waiver or other communication to be delivered hereunder by either party
shall be in writing and shall be considered duly delivered if personally
delivered, mailed by certified mail with the postage prepaid (return receipt
requested), sent by messenger or overnight delivery service or sent by facsimile
transmission to the address of the other party as set forth below:

     Transporter: Regency Intrastate Gas Services, LLC
                  401 Edwards Street
                  Suite 1320
                  Shreveport, Louisiana 71101
                  Attn: Mr. Martin Anthony
                  Telecopy: (318) 677-5560

    With a copy (which shall not constitute notice) to:

                  Regency Gas Services LLC
                  Suite 2900
                  1700 Pacific Street
                  Dallas, Texas 75201
                  Attn: Chief Operating Officer
                  Telecopy: (214) 750-1749

                                      -32-

<PAGE>

     Shipper:     Anadarko Energy Services Company
                  1200 Timberloch Place
                  The Woodlands, Texas 77380
                  Attn: Marketing - Field Services
                  Telecopy: 832-636-7090

     For Invoicing to:

                  Anadarko Energy Services Company
                  P.O.Box 1330
                  Houston, TX 77251-1330
                  Attn: Marketing Accounting
                  Telecopy: 832-636-7035

or to such other address as a party may provide to the other party in the manner
provided in this Section 11.01. Notice by mail shall be deemed given and
received on the third day after posting. Notice by personal delivery, messenger,
overnight delivery service or facsimile shall be deemed given and received on
the date of actual delivery.

     Section 11.02. Payments. Shipper and Transporter agree to apply the
provisions of Section 16 (BILLING) of the Operating Statement to the
transportation services provided under this Agreement, such provisions having
been incorporated herein by reference. Shipper agrees to make payment to
Transporter in accordance with those provisions by wire transfer to the
following account in accordance with the following wire transfer instructions or
to such other account in accordance with such other wire transfer instructions
as Transporter may provide to Shipper from time to time in accordance with
Section 11.01:

     Regency Intrastate Gas Services LLC Wells Fargo Bank, NA
     ABA #121000248
     Acct. # 4010002251

     Section 11.03. Assignment. Neither party may assign this Agreement or any
of its rights and obligations arising hereunder without the prior written
consent of the other party hereto, which consent will not be unreasonably
withheld; provided, however, (i) either party hereto may, without the consent of
the other party but without relieving the assigning party of its liabilities and

                                      -33-

<PAGE>

obligations hereunder, assign this Agreement to any of its Affiliates and (ii)
that a merger of a party hereto with and into a third party by operation of law
shall not constitute an assignment within the purview of this Section.

     Section 11.04. Entire Agreement. This Agreement, together with the Exhibits
hereto and the Operating Statement, contain the entire understanding of the
parties hereto with respect to the subject matter hereof and supersedes all
prior agreements, arrangements and understandings with respect to the subject
matter hereof.

     Section 11.05. Amendment. This Agreement may be amended, modified or
superseded only by an instrument in writing duly executed by each of the parties
hereto and it may be terminated only by an instrument in writing duly executed
and delivered by a party acting in accordance with the provisions of Section
11.01. Any of the terms of this Agreement and any of the conditions to a party's
obligations hereunder may be waived only by an instrument in writing executed by
the other party and specifically stating that such party waives the particular
term or condition.

     Section 11.06. Severability. Each portion of this Agreement is intended to
be severable. If any term or provision hereof is determined to be illegal or
invalid by a court of competent jurisdiction for any reason, such illegality or
invalidity shall not affect the validity of the remainder of this Agreement.

     Section 11.07. Arbitration. Any dispute arising out of or relating to this
Agreement shall be resolved by binding arbitration conducted by the Houston,
Texas, office of the American Arbitration Association ("AAA"). The arbitration
shall be conducted in accordance with the AAA's Commercial Arbitration Rules
(the "Rules") effective at the time of the dispute. The Expedited Procedures of
the AAA's Commercial Arbitration Rules shall apply to any dispute in which no
disclosed claim or counterclaim exceeds $500,000.00, exclusive of interest and

                                      -34-

<PAGE>

arbitration fees and costs. If the Expedited Procedures apply, the arbitration
shall be heard and decided by a single arbitrator to be appointed by the AAA.
For all other disputes, the arbitration shall be heard and decided by three
arbitrators, one to be designated by each Party and the third neutral arbitrator
to be selected by the mutual agreement of the two arbitrators. Each Party shall
designate its arbitrator within twenty (20) days of the respondent receiving
notice of the arbitration. The arbitrators selected by the Parties shall select
the third arbitrator within fifteen (15) days of their appointment. If the
arbitrators selected by the Parties are unable or fail to agree upon the third
arbitrator, the third arbitrator shall be selected by the AAA. Prior to
acceptance of appointment as an arbitrator, each arbitrator shall have read and
affirmatively agreed to observe all provisions of the AAA's Code of Ethics for
Arbitrators in Commercial Disputes. THE SUBSTANTIVE AND PROCEDURAL LAWS OF THE
STATE OF TEXAS (EXCLUDING ANY CONFLICT-OF-LAWS RULES OR PRINCIPLES AS APPLIED IN
TEXAS) SHALL APPLY. Both Texas and federal law, neither to the exclusion of the
other, shall apply to the enforceability and scope of this provision, and, in
the event of a conflict between Texas and federal law, the law maximizing the
enforceability and scope of this provision, including laws relating to appellate
remedies, may be invoked, without excluding applicability of other law, by the
Party seeking to compel arbitration. The arbitrators shall make a reasoned
award. If no appeal is filed within twenty (20) days after entry of an award,
the award shall be final and binding on each Party and for all purposes. Within
twenty (20) days after receipt of an award (which shall not be binding if an
appeal is taken), any Party may notify the AAA of an intention to appeal to a
second arbitral tribunal, constituted in the same manner as the initial
tribunal. The appeal tribunal shall be entitled to adopt the initial award as
its own, modify the initial award or substitute its own award for the initial
award. The appeal tribunal shall not modify or replace the initial award except
for manifest disregard of law or facts. The

                                      -35-

<PAGE>

award of the appeal tribunal shall be final and binding on each Party and for
all purposes. Judgment upon a final award may be entered in any court having
jurisdiction. This arbitration provision shall survive the termination of this
Agreement. Should the Parties ever be prevented by applicable law from utilizing
arbitration to resolve disputes hereunder, then the choice of law and forum
provisions of this Section shall nevertheless remain in full force and effect.

     Section 11.08. Counterparts. This Agreement may be executed in
counterparts, each of which shall be deemed an original and all of which, taken
together, shall constitute but a single instrument.

     IN WITNESS WHEREOF, this Agreement is executed effective as of the date and
year first above written.

WITNESSES:                              REGENCY INTRASTATE GAS LLC

/s/ William E. Joor, III                By: /s/ Mike Williams
-------------------------------------       ------------------------------------
/s/ Alvin Suggs                         Title: Vice President
-------------------------------------          ---------------------------------

WITNESSES:                              ANADARKO ENERGY SERVICES COMPANY

(illegible)                             By: /s/ James T. Hackett
-------------------------------------       ------------------------------------

                                        Title: President and Chief
(illegible)                                    Executive Officer
-------------------------------------          ---------------------------------

                                      -36-

<PAGE>

                                   EXHIBIT "A"
                                POINTS OF RECEIPT

Maximum Daily Transportation Quantity ("Demand Quantity") is 100,000 MMBtu per
day from the following Points of Receipt(s):

1.   Anadarko's Caney Lake Central Delivery Point
     Interconnection between Transporter and
     Shipper located in Section __, Township
     16N, Range 2 West, Jackson
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

Interruptible Quantity up to 100,000 MMBtu per day from the following Points of
Receipt(s):

2.   Anadarko's Caney Lake Central Delivery Point
     Interconnection between Transporter and
     Shipper located in Section __, Township
     16N, Range 2 West, Jackson
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

Points of Receipt shall include all other points as the parties hereto may
mutually agree.

<PAGE>

                                  EXHIBIT "A-1"
                               POINTS OF DELIVERY

Firm Transportation of 100,000 MMBtu per day will be accepted by Transporter at
the Points of Receipt(s) shown on Exhibit "A" and redelivered to a designated
Points of Delivery shown below to Shipper or for the account of Shipper:

1.   Interconnection between Transporter and
     ANR Pipeline located in Section 12, Township
     13N, Range 6 East, Franklin
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

     Interconnection between Transporter and
     Columbia Gulf Transmission located in
     Section 14, Township
     13N, Range 7 East, Franklin
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

     Interconnection between Transporter and
     Trunkline Gas Company, LLC located in
     Section 23, Township
     14N, Range 4 East, Caldwell
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

     Interconnection between Transporter and
     Texas Gas Transmission, LLC located in
     Section 14, Township
     13N, Range 7 East, Franklin
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

     Interconnection between Transporter and
     Tennessee Gas Pipeline located in
     Section 17, Township
     14N, Range 4 East, Caldwell
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

     Interconnection between Transporter and
     Crosstex Louisiana System located in

<PAGE>

     Section __, Township
     __N, Range _ East, Caldwell,
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

     Interconnection between Transporter and
     Transporter located in Section 33, Township
     17 North, Range 6 West, Bienville Parish, LA;
     Regency Meter 14867 (Gulf States Hub)

Interruptible Transportation of up to 100,000 MMBtu per day will be accepted by
Transporter at the Points of Receipt(s) shown on Exhibit "A" and redelivered to
a designated Points of Delivery shown below to Shipper or for the account of
Shipper:

1.   Interconnection between Transporter and
     ANR Pipeline located in Section 12, Township
     13N, Range 6 East, Franklin
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

     Interconnection between Transporter and
     Columbia Gulf Transmission located in
     Section 14, Township
     13N, Range 7 East, Franklin
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

     Interconnection between Transporter and
     Trunkline Gas Company, LLC located in
     Section 23, Township
     14N, Range 4 East, Caldwell
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

     Interconnection between Transporter and
     Texas Gas Transmission, LLC located in
     Section 14, Township
     13N, Range 7 East, Franklin
     Parish, LA; REGENCY Meter _____
     ________ Meter _________

     Interconnection between Transporter and
     Tennessee Gas Pipeline located in
     Section 17, Township
     14N, Range 4 East, Caldwell
     Parish, LA; REGENCY Meter _____

<PAGE>

     ________ Meter _________

     Interconnection between Transporter and
     Crosstex Louisiana System located in
     Section __, Township
     __N, Range _ East, Caldwell
     Parish, LA; REGENCY Meter _____

     ________ Meter _________

     Interconnection between Transporter and
     Transporter located in Section 33, Township
     17 North, Range 6 West, Bienville Parish, LA;
     Regency Meter 14867 (Gulf States Hub)

<PAGE>

                                   EXHIBIT "B"

                                   ----------

                               GENERAL CONDITIONS

                                  APPLICABLE TO

                            TRANSPORTATION AGREEMENTS

                                 FOR NATURAL GAS

                            IN THE STATE OF LOUISIANA

                       UNDER SECTION 311(a)(2) OF THE NGPA

                                   ----------

<PAGE>

                                   ----------

                               GENERAL CONDITIONS

                                  APPLICABLE TO

                            TRANSPORTATION AGREEMENTS

                                 FOR NATURAL GAS

                            IN THE STATE OF LOUISIANA

                       UNDER SECTION 311(a)(2) OF THE NGPA

                                   ----------

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
ARTICLE            TITLE                                                    PAGE
-------            -----                                                    ----
<S>       <C>                                                               <C>
B-I       Measurements and Tests                                             B-1
B-II      Quality                                                            B-7
</TABLE>

<PAGE>

                               GENERAL CONDITIONS

                                   ARTICLE B-I

                             MEASUREMENTS AND TESTS

     1. The measurement of Gas at each Point of Receipt and Delivery shall be
accomplished in accordance with the following:

          (a) The unit of volumes for all purposes of measurement hereunder
shall be one (1) cubic foot of Gas at a temperature of sixty (60) degrees
Fahrenheit and at an absolute pressure of fifteen and twenty-five thousandths
(15.025) pounds per square inch absolute. The average atmosperic pressure shall
be assumed to be fourteen and seven tenths (14.7) pounds per square inch at the
Point(s) of Receipt and at the Point(s) of Delivery. Whenever conditions of
temperature and pressure differ from such standard, conversion of the volume of
Gas from such conditions to the standard conditions shall be made in accordance
with the Ideal Gas Laws corrected for deviation of the Gas from Boyle's Law in
accordance with the methods and formulas prescribed in the American Gas
Association's manual for the determination of supercompressibility factors for
Natural Gas as last amended and superseded.

          (b) The volume of Gas transported hereunder shall be measured by
orifice or Ultrasonic measuring equipment installed in accordance with the
latest official published specifications of the American Gas Association (AGA
Report #3 or AGA Report # 9). Such measurement, both volumetric and thermal,
shall be computed in accordance to the latest publications of the American Gas
Association in AGA Report # 3 or AGA Report # 9 in conjunction with the American
National Standard publication, Orifice Metering of Natural Gas, ANSI/API 2530,
latest revision. The recording device shall be an EFM and shall comply with

<PAGE>

API 21.1, latest revision.

          (c) The volume of Gas transported will measured by using an EFM that
shall meet compliance with API 21.1 latest revision.

          (d) The specific gravity of the Gas shall be determined at the
point(s) of measurement by one of the following methods, mutually acceptable to
both parties: (1) by an on line chromatograph or (2) by continuous sampling.

          (e) The arithmetical average of the hourly temperature when Gas is
flowing, the factor for specific gravity according to the latest test therefor
and the corrections for deviation from Boyle's Law applicable during each
metering period shall be used to make proper computations of Gas volumes
measured hereunder.

          (f) The Gross Heating Value of Gas, as defined in Section 1.01 of
Article I of this Agreement shall, at Transporter's option, be determined at
each point(s) of measurement hereunder: (1) by an online chromatograph or (2) by
composite samples from a continuous Gas sampler taken by Transporter and/or its
nominee by application of the methods contained in API/GPA standards and in such
amendments and revisions thereto and superseding reports thereof as recommended
by such committee. The Gross Heating Value, however determined, shall be
converted to the same condition stipulated for the unit of volume in Article
B-I, Section (1)(a) of these General Conditions. If an analytical chromatograph
is used, such analytical chromatograph shall be of a design and manufacture
mutually agreeable to both the Shipper and the Transporter. The method of Btu
computation for a perfect Gas shall be derived from the "Table of Physical
Constants of Paraffin Hydrocarbons and Other Compounds" as published in the Gas
Processors Association Bulletin 2145-84 and superseding revisions thereof. The
analysis shall be complete and individual values in mol percent or fraction of
each hydrocarbon compound shall be listed

<PAGE>

through CH(6). The CH(6)+ value shall include the sum of the remaining
hydrocarbons in the sample and the designated value for CH(6)+ shall be 60%
CH(6), 30% CH(7) and 10% CH(8). The analysis shall further include the mol
fraction or percent individually of additional compounds contained in
chromatographically measurable quantities contained in the sample. The method to
be used for chromatographic analysis shall be that contained in Gas Processors
Association publication number 2261-72, GPA Method of Analysis for Natural and
Similar Gaseous Mixtures by Gas Chromatography.

          (g) Upon mutual agreement of the parties, other types of Btu per cubic
foot measuring devices may be installed, operated and Btu computed in accordance
with the manufacturer instructions for same and consistent with
industry-accepted practices for transmission Btu per cubic foot measurement.

          (h) Gas samples taken from the pipeline system for purposes of
determining or deriving quantitative values that will be used in the computation
of Gas volume and Btu per cubic foot shall be obtained through use of a probe to
be inserted sufficiently beyond the periphery of the internal pipe walls to
assure that the Gas being drawn for the sample is free of any liquid
accumulation from the internal pipe wall.

          (i) If the method for determining chromatographic analysis, as set
forth in the GPA publication 2261-72, is revised, both parties agree that this
Agreement will be amended accordingly.

          (i) Transporter shall install, own, operate and maintain standard type
measuring and testing equipment necessary to measure and test Gas transported
hereunder and shall keep same accurate and in good repair. Transporter will
provide for Shipper the ability to install check measurement by means of
additional meter taps separate of the taps used for custody measurement.

<PAGE>

Transporter's EFM equipment shall be tested once each month for accuracy. Data
editing, calibrations, repairs and adjustments of Transporter's measuring and
testing equipment shall be done only by employees of Transporter or its
designated representatives. All analyzing can be witnessed. Shipper or its
designated representative shall, in the presence of an employee of Transporter
or Transporter's designated representative, have access to Transporter's
measuring and analyzing equipment at any reasonable time, and shall have the
right to witness tests, calibrations and adjustments thereof. All tests
scheduled hereunder shall be preceded by reasonable notice to Shipper. Upon
request of either party hereto for a special test of any meter or auxiliary
equipment, Transporter shall promptly verify the accuracy of same; provided,
however, that the cost of such special test shall be borne by the requesting
party, unless the percentage of inaccuracy found is more than one percent (1%).

          If, upon any test, any measuring equipment is found to be in error,
such errors shall be taken into account in a practical manner in computing the
deliveries. If the resultant aggregate error in the computed receipts is not
more than one percent (1%), then previous receipts shall be considered accurate.
All equipment shall, in any case, be adjusted at the time of test to record
correctly. If, however, the resultant aggregate error in computed receipts
exceeds one percent (1%) of a recording corresponding to the average hourly rate
of Gas flow for the period since the last preceding test, the previous
recordings of such equipment shall be corrected to zero error for any period
that is known definitely or agreed upon, but, if the period is not known
definitely or agreed upon, such correction shall be for a period extending back
one-half of the time elapsed since the date of the last test, not exceeding a
correction period of sixteen (16) days.

          (j) If any meter or auxiliary equipment is out of service or out of
repair for a period of time so that the amount of Gas delivered cannot be
ascertained or computed from the reading

<PAGE>

thereof, then the Gas delivered during such period shall be estimated upon the
basis of the best data available, using the first of the following methods that
is feasible: (1) by using the registration of any check meter or meters, if
installed and accurately registering, (2) by correcting the error if the
percentage of error is ascertainable by calibration tests or mathematical
calculations, (3) by estimating Gas volumes on the basis of deliveries during
the preceding periods under similar conditions when the equipment was
registering accurately, or (4) by other method(s) mutually acceptable to both
parties.

          (l) Upon request of Shipper, Transporter shall submit its measurement
charts and records to Shipper for examination, the same to be returned within
thirty (30) days. Transporter's measurement charts and records for a given
accounting month will be presumed correct if no written objection thereto is
served on either party hereto by the other within the Year following any Month,
but the same shall be retained for a two (2) Year period.

          (m) Shipper may install, operate and maintain, at its sole cost, risk
and expense, but in the same manner as is required for Transporter's equipment
hereunder, check measuring and testing equipment of standard type; provided,
however, that the same does not interfere with the operation of Transporter's
equipment. The measurement and testing of Gas for purposes of this Agreement
shall, nevertheless, be effected only by Transporter's equipment. Transporter
shall have the same rights with respect to said check metering and testing
equipment of Shipper as are granted to Shipper with respect to Transporter's
metering and testing equipment.

          (n) If it is determined prior to, or as a result of, in-service tests,
experience and observation by either Shipper or Transporter that pulsations
exist that affect the measurement accuracy, then the operator of the facilities
agrees to install and operate mechanical dampening equipment necessary to
eliminate such pulsations.

<PAGE>

          (o) If at any time during the term hereof a new method or technique is
developed with respect to Gas measurement, or the determination of the factors
used in such Gas measurement, such new method or technique may be substituted
for the method set forth in this Section when, in Transporter's sole discretion,
employing such new method or technique is advisable. Transporter shall notify
Shipper in writing of any such election prior to actually implementing such
substitution.

                                  ARTICLE B-II

                                     QUALITY

     1. The Gas received and delivered at each Point(s) of Receipt and Point(s)
of Delivery shall meet the following quality specification:

          (a) Oxygen - The oxygen content shall not exceed ten (10) parts per
million of uncombined oxygen, and the parties shall make reasonable efforts to
maintain the Gas free from oxygen.

          (b) Hydrogen Sulphide - The hydrogen sulphide content shall not exceed
one quarter (1/4) grain per one hundred (100) cubic feet of Gas.

          (c) Total Sulphur - The total sulphur content, including mercaptans
and hydrogen sulphide, shall not exceed one (1) grain per one hundred (100)
cubic feet of Gas.

          (d) Carbon Dioxide - The carbon dioxide content shall not exceed two
percent (2%) by volume.

          (e) Liquids - The Gas shall be free of water and other objectionable
liquids at the temperature and pressure at which the Gas is delivered and the
Gas in no event contain water vapor in excess of seven (7) pounds per one
million (1,000,000) cubic feet (as determined by a dew point apparatus in
general use in the industry on a basis not less often than Monthly).

<PAGE>

          (f) Dust, Gums and Solid Matter - The Gas shall be commercially free
of dust, gums, gum forming constituents and other solid matter.

          (g) Gross Heating Value - The Gas delivered shall have a Gross Heating
Value of not less than nine hundred fifty (950) Btu's per cubic foot.

          (h) Temperature - The Gas shall be delivered at a temperature of not
less than forty degrees (40 degrees) Fahrenheit and not more than one hundred
twenty degrees (120 degrees) Fahrenheit.

          (i) Nitrogen - The nitrogen content shall not exceed three percent
(3%) by volume and total inert gases shall not exceed four percent (4%) by
volume.

          (j) Other - The Gas shall contain no carbon monoxide, halogens or
unsaturated hydrocarbons.

          (k) Hazardous Waste - The Gas shall contain no hazardous waste as
defined in the Resources Conservation and Recovery Act of 1976.

          (l) Dew point. The Gas shall not have a hydrocarbon dew point in
excess of ten (10) degrees Fahrenheit under expected operating conditions.

     2. If any Gas delivered by Shipper to Transporter at any Point of Receipt
fails to meet the quality specifications set forth above ("Nonconforming Gas"),
Transporter may refuse to accept delivery of such Gas until Shipper or Shipper's
supplier shall have corrected the quality deficiency. Transporter's option to
refuse delivery of Nonconforming Gas shall be in addition to other remedies
available to Transporter. If Transporter shall at any time accept delivery of
Nonconforming Gas, such acceptance shall not constitute a waiver of any
provision of this Agreement with respect to any future delivery of Gas.

                               END OF EXHIBIT "B"exv10w1

 

Exhibit 10.1

NOVEMBER 18, 2005

CONFIDENTIAL

Dr. Casey Case

605 Barroilhet Avenue

San Mateo, CA 94402

Dear Casey:

This document, upon your signature, will constitute the agreement between you and Sangamo
BioSciences, Inc. (the “Company”), on the terms of your separation from employment (the
“Agreement”). It is understood that both you and the Company want to preclude any dispute arising
out of your employment, your separation, or any other matter involving you and the Company and also
wish to preserve the good will that exists between you and the Company.

Termination of Employment

1. Termination Date. You hereby submit your resignation as Vice President of
Research Operations and from all other offices and positions you hold with the Company,
effective November 18, 2005 (“Termination Date”). As of this date, your employment
relationship with the Company will terminate.

2. Consulting Services.

(a) During the period from the Termination Date through the earlier of March 18, 2006 and the
date determined in accordance with Section 2(b) below (the “Consulting Period”), you agree to
serve as a consultant to the Company. In this capacity, you will provide services as
requested from time to time by the Chief Executive Officer including transitioning research
operations matters to the Company’s executive officers. During the Consulting Period, you
will perform assignments as reasonably requested by the Chief Executive Officer, and use your
best efforts to promote the interests of the Company; however, it is not expected that you
will devote your full time to your consultancy.

(b) In the event you become an employee or a service provider to or obtain an economic
interest in (excluding ownership of less than 1% of the outstanding stock of any publicly
held company) a Competitor (as defined below), your service as a consultant to the Company
will immediately and automatically be terminated without any action on the part of the
Company. A Competitor shall mean any business engaged in any phase of the business of
researching, developing, producing or selling nucleic acid binding proteins, gene regulation
or gene correction technologies or functional alternatives therefor.

 

 

Dr. Casey Case

Page 2

What You Will Receive

3. Initial Severance Payment. You will receive a lump-sum cash payment from the
Company as soon as administratively practicable following the Termination Date in an amount
equal to $71,878 (the “Initial Severance Payment”). The Initial Severance Payment shall be
subject to the Company’s collection of all applicable withholding taxes, and you will only be
paid the amount remaining after such withholding taxes have been collected.

4. Additional Severance Payments.

(a) In addition to the Initial Severance Payment, you will be entitled to receive cash
severance payments in an aggregate amount of $73,333 (the “Additional Severance Payment”).
The Additional Severance Payment shall be subject to the Company’s collection of all
applicable withholding taxes, and you will only be paid the amount remaining after such
withholding taxes have been collected. Fifty percent (50%) of the Additional Severance
Payment will be paid on May 19, 2006, and the remaining 50% of the Additional Severance
Payment will be paid in two equal installments on June 19, 2006 and July 19, 2006,
respectively.

(b) You will not be entitled to receive any unpaid portion of the Additional Severance
Payment in the event you begin Employment with a Competitor prior to the applicable payment
date. The term “Employment” means providing services of any kind for compensation, either as
an employee or a consultant.

(c) The Company shall be entitled to reduce the amount of the Additional Severance Payment by
the amount of any cash compensation you earn though other Employment between the Termination
Date and July 18, 2006.

(d) Notwithstanding any provision to the contrary in this Agreement, no Additional Severance
Payment shall be made or paid to you prior to the earlier of (i) the expiration of the six
(6)-month period measured from the date of your “separation from service” with the Company,
as such term is defined in Treasury Regulations issued under Section 409A of the Internal
Revenue Code (the “Code”) or (ii) the date of your death, if you are deemed at the time of
such separation from service a “key employee” within the meaning of that term under Code
Section 416(i) and such delayed commencement is otherwise required in order to avoid a
prohibited distribution under Code Section 409A(a)(2). Upon the expiration of the applicable
Code Section 409A(a)(2) deferral period, all payments deferred pursuant to this Paragraph 4
shall be paid in a lump sum to you, and any remaining payments due under this Agreement shall
be paid in accordance with the normal payment dates specified for them herein.

 

 

Dr. Casey Case

Page 3

5. Benefits.

(a) After the Termination Date, you may elect to continue group health benefits (i.e.
medical, health and vision as currently enrolled) under COBRA. If you elect COBRA coverage,
the Company will reimburse you for such COBRA coverage at the monthly rate of $1,667 until
the earlier of July 18, 2006 or the date you begin Employment or the substantial equivalent
thereof with another company. In the event that the Company’s health care coverage
reimbursement payments would result in the recognition of taxable income (whether for
federal, state or local income tax purposes) by you or your spouse or other eligible
dependent, the Company shall provide an additional cash payment to the affected party or
parties in an amount sufficient to cover the income and employment tax liability resulting
from such coverage and from the additional payment itself so that you and your spouse and
eligible dependents do not incur any out-of-pocket tax liability with respect to such
continued health care coverage (the “Gross-Up Payment”). Notwithstanding the foregoing, in
no event will the Gross-Up Payments exceed $13,336 in the aggregate. Unless otherwise
requested, you will be reimbursed on a ratable basis each quarter.

(b) Notwithstanding any provision to the contrary in this Agreement, no Gross-Up Payment
shall be made or paid to you prior to the earlier of (i) the expiration of the six (6)-month
period measured from the date of your “separation from service” with the Company, as such
term is defined in Treasury Regulations issued under Section 409A of the Internal Revenue
Code (the “Code”) or (ii) the date of your death, if you are deemed at the time of such
separation from service a “key employee” within the meaning of that term under Code Section
416(i) and such delayed commencement is otherwise required in order to avoid a prohibited
distribution under Code Section 409A(a)(2). Upon the expiration of the applicable Code
Section 409A(a)(2) deferral period, all payments deferred pursuant to this Paragraph 5 shall
be paid in a lump sum to you, and any remaining payments due under this Agreement shall be
paid in accordance with the normal payment dates specified for them herein.

6. Stock Options. During the Consulting Period, you will continue to vest in your
Company stock options in accordance with the terms of your Stock Option Agreements and the
Company’s 2000 and 2004 Stock Incentive Plans. Beginning on the last day of the Consulting
Period, you will have the limited time period specified in each of your Stock Option
Agreements to exercise your vested Company stock options. Upon the expiration of such
limited exercise period your Company stock options will terminate and cease to be outstanding
for any vested option shares for which the options have not been exercised.

 

 

Dr. Casey Case

Page 4

What You Are Agreeing to Release

7. General Release. In consideration for the foregoing benefits, payments and other
consideration, you agree to unconditionally and forever release and discharge the Company and
all of its related entities, officers, directors, agents and employees, and each of them, of
and from any and all debts, claims, liabilities, demands and causes of action of every kind,
nature and description, whether known or unknown, including, but not limited to, any claim
for salary, stock options, severance, benefits, and any other form of compensation; claims
for breach of contract, breach of the covenant of good faith and fair dealing, termination in
violation of public policy or wrongful termination; negligence; intentional torts; fraud and
misrepresentation; any claim for breach of fiduciary duty, whether as a shareholder or in any
other capacity; and any claims under federal, state or local law, including, but not limited
to, the Fair Employment and Housing Act, the California Labor Code, the Family Medical Leave
Act, the California Family Rights Act, the Age Discrimination in Employment Act (“ADEA”), the
Americans with Disabilities Act, and Title VII of the Civil Rights Act of 1964, and any
waivable clams under any workers’ compensation statute, which you have or may have or could
assert against the Company as of the Effective Date of this Agreement, including, but not
limited to, any claims arising out of or connected with your employment, the termination of
your employment, or your investment in the Company or ownership of the Company’s stock.

8. Waiver of Claims. It is further understood and agreed that as a condition of this
Agreement, you expressly waive and relinquish all claims, rights or benefits that you may
have under California Civil Code 1542, which provides as follows:

“A general release does not extend to claims which the creditor does
not know or suspect to exist in his favor at the time of executing
the release which if known by him must have materially affected his
settlement with the debtor.”

Other Agreements

9. Employee Loan. You agree that you owe Sangamo the outstanding balance of your
loan with the Company, currently standing at $16,878. This amount will be deducted from the
Initial Severance Payment, in satisfaction of your obligation under the loan.

10. Non-Disparagement.

(a) You agree that you will not make any negative or disparaging statements or comments,
either as fact or opinion, about the Company, including but not limited to its employees,
officers, directors, shareholders, vendors, products or services, business, technologies,
market position, financial statements, financial condition, performance and other similar
information.

 

 

Dr. Casey Case

Page 5

(b) Company agrees that, as long as the following persons are employed by the Company in such
capacity — Edward Lanphier, President & Chief Executive Officer, Dale Ando, Vice President,
Therapeutic Development and Chief Medical Officer, David Ichikawa, Senior Vice President,
Business Development, Philip Gregory, Vice President, Research and Greg Zante, Sr. Director,
Finance & Administration each will not make any disparaging statements or comments to any
third party, either as fact or as opinion, about you or your performance at the Company.
This provision is not intended to preclude such persons from providing truthful testimony as
may be required by law.

11. Proprietary and Confidential Information. You also agree to preserve as
confidential and not to use or disclose any Sangamo trade secrets, confidential knowledge,
data or other proprietary information relating to technology customers, products, business
plans, financial or organizational information or other subject matter pertaining to any
business of the Company or any of its clients, customers, or licensees from this day forward.
You agree to execute the Proprietary Information, Inventions and Materials Agreement
attached hereto as Exhibit A.

12. Confidentiality. You agree that the terms of this Agreement are confidential.
It is therefore agreed that, unless compelled by law, you will not reveal, discuss, publish
or in any way communicate any of the terms or amount of this Agreement to any person or
entity, except to any of your attorneys, tax consultants, professional representatives,
spouse or other family member, and any other person with a business need to know information
concerning this Agreement.

13. Waiver, Amendment and Modification of Agreement. No waiver, amendment or
modification of any of the terms of this Agreement shall be effective unless in writing and
signed by all parties. No waiver of any term, condition or default of any term of this
Agreement shall be construed as a waiver of any other term, condition or default.

14. California Law Applies. This Agreement, in all respects, shall be interpreted,
enforced, governed by and construed in accordance with the laws of the State of California
applicable to contracts made and to be performed entirely within such state, without regard
to the choice-of-law or conflict-of-laws principles of any jurisdiction.

15. Breach. You and the Company agree that, in the event of any breach of this
Agreement, the non-breaching party shall be entitled to pursue all available legal and
equitable remedies, including injunctive relief, and shall have the right to recover
reasonable attorneys’ fees and costs, unless otherwise provided by law.

16. Severability. In the event that any provision hereof becomes or is declared by a
court of competent jurisdiction to be illegal, unenforceable or void, this Agreement shall
continue in full force and effect without said provision.

 

 

Dr. Casey Case

Page 6

17. Headings Are Not Controlling. The headings used in this Agreement are for the
purpose of organization only and are not intended to inform, alter or control the terms of
this Agreement.

18. Facsimile Signature. Facsimile signatures on this Agreement shall be treated as
original signatures.

19. Complete and Voluntary Agreement. This Agreement, and any other agreement
referenced herein, sets forth the entire agreement between you and the Company relating to
the subject matter hereof. You warrant that you have read and fully understood this
Agreement; that you have had the opportunity to consult with legal counsel of your own
choosing and to have the terms of the Agreement fully explained to you; that you are not
executing this Agreement in reliance on any promises, representations or inducements other
than those contained herein; and that you are executing this Agreement knowingly and
voluntarily, free of any duress and coercion.

Effective Date of the Agreement

20. Timeline for Considering, Signing and Revoking the Agreement. You understand and
agree that you have been provided a period of twenty-one (21) days within which to consider
whether you will execute this Agreement. The offer of this Agreement shall expire on the
twenty-second (22nd) day after you have received it. If this day is a Saturday, Sunday or
holiday recognized by the U.S. Postal Service, the expiration date is extended to the next
business day.

An executed Agreement must be delivered or mailed to Edward Lanphier, at Sangamo BioSciences,
Inc. on or before the twenty-first (21st) day after receiving this Agreement. Unless you
personally deliver the signed Agreement on or before this date, it must be sent by a
traceable overnight delivery service or traceable overnight express mail and postmarked on or
before this date (the end of the twenty-first (21st) day after receiving this Agreement).

You have a limited period of seven (7) calendar days after signing to revoke your acceptance
of this Agreement. You must deliver or mail written notification of revocation to Edward
Lanphier at Sangamo BioSciences, Inc. Unless you personally deliver the signed revocation
within this seven (7) calendar day period, it must be sent by a traceable overnight delivery
service or traceable overnight express mail and postmarked on or before the end of the seven
(7) calendar day period after signing this Agreement. This deadline will be extended to the
next business day should it fall on a Saturday, Sunday or holiday recognized by the U.S.
Postal Service.

Because of the revocation period, you understand that the payment requirements of this
Agreement shall not become effective or enforceable until the eighth (8th) calendar day after
the date you sign this Agreement (the “Effective Date”).

 

 

Dr. Casey Case

Page 7

Please confirm your agreement to these terms by signing the Agreement below and returning the
signed copy to me.

Very truly yours,

	 	 	 	 
	 
	/s/ Edward Lanphier 	 	 
	Edward Lanphier 	 
	President & CEO

Sangamo BioSciences, Inc. 	 	 
	 

By signing this letter, I acknowledge that I have had twenty-one (21) days to review this Agreement
carefully, and to consult with attorneys or advisors of my choice. I understand the terms of this
Agreement and the significance of the waivers that I have made, and I am signing this Agreement
voluntarily and without coercion.

	 	 	 
	/s/ Dr. Casey Case

Dr. Casey Case
	November 18, 2005

Date

 

 

Exhibit A

Form of Proprietary Information Agreement

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