EXHIBIT 10.18



RECORDING REQUESTED BY AND
WHEN RECORDED AND/OR FILED
RETURN TO:

MAYER, BROWN, ROWE & MAW
350 South Grand Avenue
Suite 2500
Los Angeles, California  90071
Attn:  Kevin L. Shaw, Esq.

Instructions to County Recorder:
Index this document as:
(1) A deed of trust
(2) A fixture filing

================================================================================

           DEED OF TRUST WITH POWER OF SALE, ASSIGNMENT OF PRODUCTION,
           SECURITY AGREEMENT, FINANCING STATEMENT AND FIXTURE FILING

                                      FROM

                              CALPINE CORPORATION,
                         a Delaware corporation, Trustor
                         (Taxpayer I.D. No. 77-0212977)

                                       TO

                    CHICAGO TITLE INSURANCE COMPANY, Trustee

                                       AND

                   THE BANK OF NOVA SCOTIA, for itself and as
                               Agent, Beneficiary
                         (Taxpayer I.D. No. 13-494-1099)
                             Dated as of May 1, 2002

================================================================================


"THIS INSTRUMENT CONTAINS AFTER-ACQUIRED PROPERTY PROVISIONS."

"THIS INSTRUMENT SECURES PAYMENT OF FUTURE ADVANCES."

"THE  OIL  AND  GAS  INTERESTS  AND  AS  EXTRACTED  COLLATERAL  INCLUDED  IN THE
ENCUMBERED  PROPERTY  WILL BE FINANCED AT THE  WELLHEADS OF THE WELLS LOCATED ON
THE PROPERTIES DESCRIBED IN EXHIBIT A HERETO, AND THIS FINANCING STATEMENT IS TO
BE FILED FOR RECORD, AMONG OTHER PLACES, IN THE REAL ESTATE RECORDS."




"THE  TRUSTOR HAS AN INTEREST OF RECORD IN THE REAL ESTATE  CONCERNED,  WHICH IS
DESCRIBED IN EXHIBIT A HERETO."

"SOME OF THE PERSONAL PROPERTY CONSTITUTING A PORTION OF THE ENCUMBERED PROPERTY
IS OR IS TO BE AFFIXED TO THE PROPERTIES DESCRIBED IN EXHIBIT A HERETO, AND THIS
FINANCING  STATEMENT AND FIXTURE  FILING IS TO BE FILED FOR RECORD,  AMONG OTHER
PLACES, IN THE REAL ESTATE RECORDS."

"THE  SECURED  PARTIES  ARE  NOT  SELLERS  OR  PURCHASE  MONEY  LENDERS  OF  THE
COLLATERAL."

"A POWER OF SALE HAS BEEN  GRANTED  IN THIS DEED OF  TRUST.  A POWER OF SALE MAY
ALLOW THE TRUSTEE TO TAKE THE  ENCUMBERED  PROPERTY AND SELL IT WITHOUT GOING TO
COURT IN A  FORECLOSURE  ACTION UPON  DEFAULT BY THE TRUSTOR  UNDER THIS DEED OF
TRUST."

"NOTICE TO JUNIOR  LIENHOLDERS:  THE OBLIGATIONS  SECURED HEREBY PROVIDE FOR THE
ACCRUAL OF INTEREST WHICH MAY RESULT IN INCREASES IN THE PRINCIPAL BALANCE ABOVE
THE FACE PRINCIPAL AMOUNT OF THE APPLICABLE NOTES."




           DEED OF TRUST WITH POWER OF SALE, ASSIGNMENT OF PRODUCTION,
           SECURITY AGREEMENT, FINANCING STATEMENT AND FIXTURE FILING

     THIS DEED OF TRUST WITH POWER OF SALE,  ASSIGNMENT OF PRODUCTION,  SECURITY
AGREEMENT,  FINANCING STATEMENT AND FIXTURE FILING,  dated as of May 1, 2002, is
from CALPINE CORPORATION, a Delaware corporation (herein called the "Trustor" or
"Borrower"),  to CHICAGO TITLE INSURANCE  COMPANY,  a Missouri  corporation,  as
trustee (herein, together with any successor hereto in such capacity, called the
"Trustee"),   and  THE  BANK  OF  NOVA  SCOTIA,   a  Canadian   chartered   bank
("Scotiabank"),  for itself and as agent for the Lenders and the Lender Parties,
as beneficiary (herein called the "Agent").

                            Recitals and Definitions
                            ------------------------

     Borrower, certain institutional lenders (individually,  a "2002 Lender" and
collectively,  the "2002  Lenders")  and  Scotiabank  have entered into a Credit
Agreement,  dated as of  March  8,  2002  (herein,  as the same may be  amended,
modified or supplemented  from time to time,  called the "2002 Loan Agreement"),
pursuant to which the 2002  Lenders  have  agreed to make loans to Borrower  and
issue or cause to be  issued  letters  of credit  for the  benefit  of  Borrower
(individually,  a "2002 Letter of Credit" and collectively, the "2002 Letters of
Credit")  in amounts not to exceed at any one time  outstanding  $1,600,000,000,
and Borrower,  to evidence its  indebtedness  to the 2002 Lenders under the 2002
Loan Agreement,  has executed and delivered (or will execute and deliver) to the
2002 Lenders its secured  promissory notes in the aggregate,  original principal
amount of $1,600,000,000, to mature not later than May 24, 2003 (individually, a
"2002 Loan Note" and collectively,  the "2002 Loan Notes"),  the 2002 Loan Notes
being payable to the order of the 2002 Lenders, bearing interest as provided for
therein,   and  containing   provisions  for  payment  of  attorneys'  fees  and
acceleration of maturity in the event of default, as therein set forth.

     Borrower, certain institutional lenders (individually, an "Existing Lender"
and collectively,  the "Existing  Lenders";  and together with the 2002 Lenders,
the "Lenders")  and  Scotiabank  have entered into a Second Amended and Restated
Credit  Agreement dated as of May 23, 2000 (herein,  as the same may be amended,
modified,  or  supplemented  from  time to time,  called  the  "Existing  Credit
Agreement")  pursuant to which the Existing Lenders have agreed to make loans to
Borrower  and issue or cause to be issued any  letters of credit for the benefit
of Borrower (individually,  an "Existing Letter of Credit" and collectively, the
"Existing  Letters  of  Credit")  in  amounts  not to  exceed  at any  one  time
$400,000,000, and Borrower, to evidence its indebtedness to the Existing Lenders
under the Existing Credit Agreement,  has executed and delivered to the Existing
Lenders  its  secured  promissory  notes to mature not later  than May 24,  2003
(individually,  an "Existing  Loan Note" and  collectively,  the "Existing  Loan
Notes"),  the  Existing  Loan Notes being  payable to the order of the  Existing
Lenders, bearing interest as provided for therein, and containing provisions for
payment of attorneys' fees and acceleration of maturity in the event of default,
as therein set forth.  The 2002 Loan Agreement and the Existing Credit Agreement
are herein collectively called the "Credit  Agreements." The 2002 Loan Notes and
the Existing Loan Notes are herein individually


                                        1                        [Deed of Trust]


called a "Loan Note" and collectively  called the "Loan Notes". The 2002 Letters
of Credit and the Existing  Letters of Credit are herein  individually  called a
"Letter of Credit" and collectively called the "Letters of Credit".

     It is a condition  precedent to the obligation of the Lenders to make Loans
under the Credit  Agreements,  to issue or cause to be issued  Letters of Credit
under the Credit  Agreements and to the obligations of the Agent, the Lenders or
the Lender Parties (as the case may be), that the Trustor  executes and delivers
this instrument.

     For all purposes of this instrument, unless the context otherwise requires:

          "Affiliate"  of any Person means any other Person  which,  directly or
     indirectly, controls, is controlled by or is under common control with such
     Person  (excluding any trustee under, or any committee with  responsibility
     for  administering,  any Plan (as  defined  in the Credit  Agreements)).  A
     Person shall be deemed to be "controlled by" any other Person if such other
     Person possesses, directly or indirectly, power

          (a) to vote 10% or more of the  securities  (on a fully diluted basis)
          having ordinary voting power for the election of directors or managing
          general partners; or

          (b) to direct or cause the direction of the management and policies of
          such Person whether by contract or otherwise.

          "Agent" is defined in the Preamble of this instrument.

          "Applicable  Law"  means with  respect  to any  Person or matter,  any
     federal, state, regional, tribal or local statute, law, code, rule, treaty,
     convention,   application,   order,  decree,  consent  decree,  injunction,
     directive,  determination or other  requirement  (whether or not having the
     force of law) relating to such Person or matter and, where applicable,  any
     interpretation thereof by a Governmental Authority having jurisdiction with
     respect  thereto  or  charged  with the  administration  or  interpretation
     thereof.

          "Borrower" is defined in the Preamble of this instrument.

          "Credit Agreements" is defined in the recitals to this instrument.

          "Deed of Trust"  means  each  mortgage,  deed of trust,  or other real
     property collateral  security instrument in a form reasonably  satisfactory
     to the Agent,  executed and delivered pursuant to Section 8.1.8 of the 2002
     Credit Agreement, as amended, supplemented,  restated or otherwise modified
     from time to time, including, without limitation, this instrument.

          "Encumbered Property" shall mean the properties,  rights and interests
     hereinafter described and defined as the Encumbered Property.


                                        2


          "Environmental  Laws" shall mean any and all present and future United
     States federal, tribal, state and local laws or regulations,  codes, plans,
     orders, decrees,  directives,  judgments,  injunctions and lawfully imposed
     requirements   issued,   promulgated  or  entered  thereunder  relating  to
     pollution or  protection  of the  environment,  including  laws relating to
     reclamation   of  land  and  waterways  and  laws  relating  to  emissions,
     discharges,  releases or threatened  releases of pollutants,  contaminants,
     chemicals, or industrial,  toxic or hazardous substances or wastes into the
     environment  (including,  without  limitation,  ambient air, surface water,
     ground water, land surface or subsurface  strata) or otherwise  relating to
     the  manufacture,   processing,   distribution,  use,  treatment,  storage,
     disposal, transport or handling of pollutants, contaminants,  chemicals, or
     industrial, toxic or hazardous substances or wastes.

          "Existing  Assignment  Agreement"  means that certain  Assignment  and
     Security  Agreement executed and delivered by Calpine Gilroy Cogen, L.P., a
     California limited  partnership,  pursuant to Section 6.1.3 of the Existing
     Credit  Agreement,  substantially  in the form of Exhibit F to the Existing
     Credit  Agreement,  as  amended,  supplemented,  amended  and  restated  or
     otherwise modified from time to time.

          "Existing  Credit  Agreement"  is  defined  in the  recitals  to  this
     instrument.

          "Existing Lenders" is defined in the recitals to this instrument.

          "Existing  Letters  of Credit"  is  defined  in the  recitals  to this
     instrument.

          "Existing Loan  Documents"  means the Existing Credit  Agreement,  the
     Existing  Loan Notes,  the Existing  Assignment  Agreement,  and each other
     relevant  agreement,  document  or  instrument  (including  the fee  letter
     described in Section 3.3.2 of the Existing Credit  Agreement)  delivered in
     connection therewith.

          "Existing Loan Notes" is defined in the recitals to this instrument.

          "Fee Letter" means the fee letter agreement described in Section 3.3.2
     of the 2002 Credit Agreement.

          "Governmental  Authority" means any and all courts, boards,  agencies,
     commissions,  offices  or  authorities  of any  nature  whatsoever  for any
     governmental unit (federal, state, county, district, municipal, city, tribe
     or  otherwise)  whether now or  hereafter  in  existence  charged  with the
     administration, interpretation or enforcement of any Applicable Law.

          "Guaranty" means the guaranty executed and delivered by the Guarantors
     pursuant to Section 6.1.3 of the 2002 Credit  Agreement,  substantially  in
     the form of  Exhibit H  thereto,  as  amended,  supplemented  or  otherwise
     modified from time to time.


                                        3


          "Hazardous Materials Indemnity" means that certain hazardous materials
     undertaking and unsecured  indemnity executed and delivered by the Borrower
     pursuant  to  Section  8.1.8  of the 2002  Credit  Agreement,  as  amended,
     supplemented, restated or otherwise modified from time to time.

          "Hedging  Agreements" means: (a) interest rate swap agreements,  basis
     swap  agreements,  interest rate cap agreements,  forward rate  agreements,
     interest rate floor agreements and interest rate collar agreements, and all
     other  agreements or  arrangements  designed to protect such Person against
     fluctuations in interest rates or currency  exchange rates, and (b) forward
     contracts,  options, futures contracts,  futures options,  commodity swaps,
     commodity options,  commodity collars, commodity caps, commodity floors and
     all other  agreements  or  arrangements  designed  to protect  such  Person
     against fluctuations in the price of commodities.

          "Hedging   Obligations"   means  with  respect  to  any  Person,   all
     liabilities  (including  without  limitation  obligations  and  liabilities
     arising in connection with or as a result of early or premature termination
     of a Hedging  Agreement,  whether or not occurring as a result of a default
     thereunder) of such Person under a Hedging Agreement.

          "Hydrocarbons"  means  collectively,  oil, gas,  casinghead  gas, drip
     gasoline, natural gasoline, condensate,  distillate and all other liquid or
     gaseous  hydrocarbons and related minerals and all products  therefrom,  in
     each case whether in a natural or a processed state.

          "Indebtedness",  "Note" and "Notes" shall have the respective meanings
     set forth in Section 1.2 hereof.

          "Indemnification Claim" is defined in Section 3.6 of this instrument.

          "Indemnified  Person" means Agent and each of the Lender Parties,  and
     their respective employees, affiliates, agents and attorneys, and any other
     Person to be indemnified under this instrument.

          "Joint  Operating  Agreements"  shall mean,  with respect to the lands
     described in Exhibit A, the respective  operating  agreement  burdening the
     lands described in Exhibit A.

          "lands  described  in Exhibit A" shall  include  the real  property or
     other  interest  in any  lands  which are  either  described  in  Exhibit A
     attached hereto or the description of which is incorporated in Exhibit A by
     reference to an instrument or document containing in, or referring to, such
     a description,  and shall also include any lands now or hereafter  unitized
     or  pooled  with  lands  which are  either  described  in  Exhibit A or the
     description of which is incorporated in Exhibit A by reference and Fixtures
     and all rights,  titles and interests  appurtenant  thereto.  References to
     Exhibit A shall include, where applicable, Exhibit A-1 as well.


                                       4


          "Leases" means any and all leases  (including  without  limitation oil
     and gas leases and oil, gas and other minerals  leases),  surface leases or
     easements,  subleases,  licenses,  concessions,  operating  rights or other
     agreements  (written or verbal,  now or hereafter in effect)  which grant a
     possessory  interest  in and to,  or the  right  to  explore,  use,  lease,
     license,  possess, produce, process, store and transport Hydrocarbons from,
     operate from, or otherwise  enjoy, the Encumbered  Property,  together with
     all amendments, modifications, extensions and renewals thereof.

          "Legal Requirements" means (i) any and all present and future judicial
     decisions,  statutes,  rulings, rules,  regulations,  licenses,  decisions,
     orders,  injunctions,  decrees, permits,  certificates or ordinances of any
     Governmental  Authority  in  any  way  applicable  to the  Trustor,  or the
     Encumbered Property,  including the ownership,  use, occupancy,  operation,
     maintenance, repair or reconstruction thereof, and any other Applicable Law
     enacted  by  any   Governmental   Authority   relating  to  health  or  the
     environment, (ii) the Trustor's presently or subsequently effective Organic
     Documents,  (iii) any and all  Leases,  (iv) any and all  leases  and other
     contracts  (written  or oral) of any  nature to which the  Trustor,  or the
     Encumbered  Property  may be  bound  and  (v)  any  and  all  restrictions,
     restrictive covenants or zoning,  present and future, as the same may apply
     to the Encumbered Property.

          "Lender Party" or "Lender  Parties" means, as the context may require,
     the Agent,  any Lender and any  Affiliate  of any Lender  that is an issuer
     under a  letter  of  credit,  and  each  of  their  respective  successors,
     transferees and assigns.

          "Loan  Documents"  means the Existing Loan Documents and the 2002 Loan
     Documents.

          "Loan Note" is defined in the recitals to this instrument.

          "Maximum Lawful Rate" means the maximum  nonusurious  rate of interest
     that may be received,  charged or contracted for under  Applicable Law from
     time to time in effect.

          "Obligations"  means  any  and  all  of  the  covenants,   warranties,
     representations   and   other   obligations   (other   than  to  repay  the
     Indebtedness) made or undertaken by the Trustor or others to the Agent, the
     Lender  Parties  or others as set forth in the Credit  Agreements  or other
     Loan Documents.

          "oil and gas  leases"  shall  include  oil,  gas and  mineral  leases,
     subleases and assignments thereof,  operating rights, servitudes, and shall
     also include subleases and assignments of operating rights.

          "Operating  Equipment" shall mean all surface or subsurface machinery,
     goods, equipment, fixtures, movable property attached to immovable property
     and  other  movable  property,  inventory,  facilities,  supplies  or other
     property of whatsoever  kind or nature  (excluding  drilling rigs,  trucks,
     automotive equipment


                                       5


     or other  property  taken  to the  premises  to  drill a well or for  other
     similar  temporary  uses) now or  hereafter  located on or under any of the
     lands  described  in  Exhibit  A  which  are  useful  for  the  production,
     gathering, treatment, processing, storage or transportation of Hydrocarbons
     (together with all  accessions,  additions and attachments to any thereof),
     including,  but not by way of limitation,  all oil wells, gas wells,  water
     wells,  injection wells, casing, tubing, tubular goods, rods, pumping units
     and  engines,  christmas  trees,  platforms,  derricks,  separators,  steam
     generators,  compressors,  gun barrels, flow lines, tanks, gas systems (for
     gathering, treating and compression), pipelines (including gathering lines,
     laterals  and  trunklines),   chemicals,   solutions,  water  systems  (for
     treating,   disposal  and   injection),   power   plants,   poles,   lines,
     transformers,  starters  and  controllers,  supervisory  control  and  data
     acquisition  systems,  machine  shops,  tools,  storage yards and equipment
     stored  therein,  buildings  and  camps,  telegraph,  telephone  and  other
     communication  systems,  roads,  boats,  loading  docks,  loading racks and
     shipping facilities.

          "Organic  Documents" means the Articles of Incorporation,  Certificate
     of Incorporation,  limited  liability company  certificate of formation and
     regulations  or  operating  agreement,   partnership   agreement,   limited
     partnership  agreement,  joint venture agreement,  trust agreement or other
     similar  documents  governing the  organization and operation of a business
     association.

          "Permits" means all  authorizations,  approvals,  permits,  variances,
     land use entitlements, consents, licenses, franchises and agreements issued
     by or  entered  into  with  any  Governmental  Authority  now or  hereafter
     required for all stages of exploration, developing, operating, and plugging
     and  abandoning oil and gas wells  (including,  without  limitation,  those
     shown on Exhibit A) on all or any part of the lands  described in Exhibit A
     (or any other lands any production  from which, or profits or proceeds from
     such  production,  is attributed to any interest in the lands  described in
     Exhibit A).

          "Permitted  Encumbrances"  means  the  outstanding  liens,  easements,
     building  lines,  restrictions,   exceptions,   reservations,   conditions,
     limitations,  security interests and other matters (if any) as reflected on
     Exhibit "B" attached hereto and the lien and security  interests created by
     the Security Documents.

          "Person" means any natural person, corporation,  partnership,  limited
     liability  company,  firm,  association,  trust,  government,  governmental
     agency or any other entity,  whether acting in an individual,  fiduciary or
     other capacity.

          "Personalty" means all of the right, title and interest of the Trustor
     now  owned or  hereafter  acquired  in and to all  furniture,  furnishings,
     Equipment,   machinery,   Goods,  General  Intangibles,   money,  Accounts,
     receivables,  Contract  Rights,  Inventory,  all refundable,  returnable or
     reimbursable  fees,  deposits  or other  funds or  evidences  of  credit or
     indebtedness deposited by or on behalf of the Trustor with any Governmental
     Authority,  agencies, boards, corporations,  providers of utility services,
     public or private, including specifically, but without


                                       6


     limitation,  all refundable,  returnable or reimbursable tap fees,  utility
     deposits,  commitment  fees and development  costs,  and all other personal
     property  (other than the  Fixtures) of any kind or character as defined in
     and subject to the provisions of Article 9 of the Uniform  Commercial Code,
     now or hereafter located upon, within or about, or used in connection with,
     the  lands   described  in  Exhibit  A,  together  with  all   accessories,
     replacements  and  substitutions  thereto  or  therefor  and  the  Proceeds
     thereof.

          "Pledge Agreements" means the pledge agreements executed and delivered
     pursuant to Section 6.1.4 of the 2002 Credit Agreement,  as such agreements
     may be amended,  supplemented,  restated or otherwise modified from time to
     time, which will be in substantially the form of Exhibit I thereto.

          "Production  Sale  Contracts"  shall mean contracts now in effect,  or
     hereafter  entered  into by the Trustor,  or entered into by the  Trustor's
     predecessors  in interest,  for the sale,  purchase,  exchange,  gathering,
     transportation,  treating or processing of  Hydrocarbons  produced from the
     lands described in Exhibit A attached hereto and made a part hereof.

          "Rents  and  Revenues"  means  all of  the  rents,  revenues,  income,
     proceeds,  profits  and other  benefits  paid or  payable by parties to the
     Leases other than the Trustor for using,  leasing,  licensing,  possessing,
     operating, selling or otherwise enjoying the Encumbered Property, including
     the proceeds from the sale of Hydrocarbons.

          "Security  Documents" means the Notes, this instrument,  the financing
     statements and any and all other  instruments now or hereafter  executed by
     the Trustor or any other  person or party to evidence or secure the payment
     of the Indebtedness or the performance and discharge of the Obligations, as
     any of the foregoing may be amended,  renewed or extended.  Notwithstanding
     that the  definition of Security  Documents  and various of the  components
     thereof include  documents that may be amended,  renewed or extended,  such
     definition  shall in no way be  construed  to  suggest  that any  party has
     agreed (or is obligated) to amend, renew or extend them.

          "2002 Assignment Agreement" means that certain Assignment and Security
     Agreement  referred to in Section  6.1.8 of the 2002 Credit  Agreement,  as
     amended, supplemented, amended and restated or otherwise modified from time
     to time.

          "2002 Loan Agreement" is defined in the recitals to this instrument.

          "2002 Lenders" is defined in the recitals to this instrument.

          "2002   Letters  of  Credit"  is  defined  in  the  recitals  to  this
     instrument.


                                       7


          "2002 Loan Documents" means the 2002 Credit  Agreement,  the 2002 Loan
     Notes, the Pledge  Agreements,  the Guaranty,  the Deeds of Trust, the 2002
     Assignment  Agreement,  the Hazardous Materials Indemnity,  the Fee Letter,
     and each other  relevant  agreement,  document or  instrument  delivered in
     connection therewith.

          "2002 Loan Notes" is defined in the recitals to this instrument.

          "Taxes"  means  all  real  property  and  personal   property   taxes,
     production taxes, assessments,  permit fees, water, gas, sewer, electricity
     and other utility rates and charges,  charges for any easement,  license or
     agreement  maintained for the benefit of the Encumbered  Property,  and all
     other taxes,  charges and assessments and any interest,  costs or penalties
     with respect thereto,  of any kind and nature  whatsoever which at any time
     prior to or after the execution hereof may be charged,  assessed, levied or
     imposed  upon the  Encumbered  Property  or the Rents and  Revenues  or the
     ownership, use, occupancy or enjoyment thereof.

          "Transportation  Agreements"  shall mean any  contracts or  agreements
     entered  into  from time to time by the  Trustor,  or  entered  into by the
     Trustor's  predecessors  in  interest,  relating to the  transportation  of
     Hydrocarbons,   as  any  such   agreement   or  contract  may  be  amended,
     supplemented, restated or otherwise modified from time to time.

          "Uniform Commercial Code" shall mean the Uniform Commercial Code as in
     effect from time to time in the State of California or any other applicable
     state,  and  the  terms  "Accounts",   "Account   Debtor",   "As  Extracted
     Collateral,"  "Chattel  Paper",  "Contract  Rights",   "Deposit  Accounts",
     "Documents",  "General  Intangibles",  "Goods",  "Equipment",   "Fixtures",
     "Inventory",  "Instruments",  and  "Proceeds"  shall  have  the  respective
     meanings assigned to such terms in the Uniform Commercial Code.

          "Water  Rights"  shall  mean  (including   without   limitation  those
     described  in Exhibit A hereto) all now or  hereafter  existing or acquired
     water and water rights,  reservoirs and reservoir rights, ditches and ditch
     rights,  wells and well rights,  whether  evidenced or initiated by permit,
     decree,   well  registration,   appropriation  not  decreed,   water  court
     application,  shares  of  stock  or  other  interests  in  mutual  ditch or
     reservoir  companies or carrier ditch or reservoir  companies or otherwise,
     appertaining or appurtenant to or beneficially used or useful in connection
     with the lands  described  in Exhibit  A,  together  with all  pumps,  well
     casings,   wellheads,   electrical   installations,   pumphouses,   meters,
     monitoring wells and systems,  measuring  devices,  pipes,  pipelines,  and
     other structures or personal  property which are or may be used to produce,
     regulate, measure, distribute,  store, or use water from the said water and
     water rights,  reservoirs and reservoir  rights,  ditches and ditch rights,
     wells and well rights.

     NOW, THEREFORE,  the Trustor,  for and in consideration of the premises and
of the debts and trusts hereinafter  mentioned,  has granted,  bargained,  sold,
warranted,


                                       8


     assigned,  transferred  and  conveyed,  and by these  presents  does grant,
     bargain,  sell, warrant,  assign,  transfer and convey unto the Trustee, IN
     TRUST WITH  POWER OF SALE,  for the use and  benefit of the Agent,  all the
     Trustor's  right,  title  and  interest,  whether  now  owned or  hereafter
     acquired, in and to all of the hereinafter described properties, rights and
     interests; and, insofar as such properties, rights and interests consist of
     equipment, general intangibles,  accounts, as extracted collateral, chattel
     paper, contract rights, deposit accounts,  documents,  goods,  instruments,
     inventory,  fixtures, proceeds of collateral or any other personal property
     of a kind or character  defined in or subject to the applicable  provisions
     of the California Uniform Commercial Code (as in effect from time to time),
     the Trustor  hereby grants to said Trustee,  for the use and benefit of the
     Agent,  a security  interest  therein to the full  extent of the  Trustor's
     legal and beneficial  interest  therein,  now owned or hereafter  acquired,
     namely:

          (1) the lands  described  in Exhibit A, and Leases,  profit a prendre,
     fee,  mineral,  overriding  royalty,  royalty and other interests which are
     described in Exhibit A,

          (2) the  presently  existing  and (subject to the terms of Section 6.1
     hereof) hereafter arising unitization, unit operating,  communitization and
     pooling agreements and the properties covered and the units created thereby
     (including, without limitation, all units formed under orders, regulations,
     rules,  approvals,  decisions or other  official  acts of any  Governmental
     Authority) which are specifically described in Exhibit A or which relate to
     any of the properties and interests specifically described in Exhibit A,

          (3) the  Hydrocarbons  which are in,  under,  upon,  produced or to be
     produced from or which are  attributed or allocated to the lands  described
     in Exhibit A,

          (4) the Permits,

          (5) the Production Sale Contracts,

          (6) the Joint Operating Agreements,

          (7) the Transportation Agreements,

          (8) the Hedging Agreements,

          (9) the Leases,

          (10) the Personalty,

          (11) the Rents and Revenues,

          (12) the Operating Equipment,

          (13) the Water Rights, and


                                       9


          (14)  without  duplication  of any other  provision  of this  granting
     clause, Equipment, Fixtures and other Goods necessary or used in connection
     with,   and  Inventory,   Accounts,   As  Extracted   Collateral,   General
     Intangibles,  Contract  Rights,  Chattel Paper,  Electronic  Chattel Paper,
     Deposit  Accounts,  Documents,  Instruments  and Proceeds  arising from, or
     relating  to, the  properties  and other  interests  described in Exhibit A
     (including Exhibit A-1),

     together  with any and all  corrections  or  amendments  to,  or  renewals,
     extensions or ratifications  of, or replacements or substitutions  for, any
     of  the  same,  or any  instrument  relating  thereto,  and  all  accounts,
     contracts,  contract rights,  options,  nominee agreements,  unitization or
     pooling  agreements,  operating  agreements and unit operating  agreements,
     processing agreements, farmin agreements, farmout agreements, joint venture
     agreements,   partnership   agreements   (including  mining  partnerships),
     exploration  agreements,  bottom  hole  agreements,  dry  hole  agreements,
     support  agreements,  acreage  contribution  agreements,  surface  use  and
     surface  damage  agreements,  net profits  agreements,  production  payment
     agreements,  Hedging Agreements,  insurance policies, title opinions, title
     abstracts, title materials and information,  files, records, writings, data
     bases,  information,  systems, logs, well cores, fluid samples,  production
     data  and  reports,   well  testing  data  and  reports,   maps,   seismic,
     geophysical,  geological and chemical data and information,  interpretative
     and  analytical  reports  of  any  kind  or  nature   (including,   without
     limitation, reserve studies and reserve evaluations), computer hardware and
     software and all  documentation  therefor or relating  thereto  (including,
     without  limitation,  all licenses  relating to or covering  such  computer
     hardware,  software  and/or  documentation),   trade  secrets,  trademarks,
     service marks and business names and the goodwill of the business  relating
     thereto, copyrights, copyright registrations, unpatented inventions, patent
     applications  and patents,  rights-of-way,  franchises,  bonds,  easements,
     servitudes,  surface leases, permits, licenses,  tenements,  hereditaments,
     appurtenances,  concessions,  occupancy agreements, privileges, development
     rights,   condemnation  awards,  claims  against  third  parties,   general
     intangibles,  rents,  royalties,  issues,  profits,  products and proceeds,
     whether now or hereafter existing or arising,  used or useful in connection
     with, covering,  relating to, or arising from or in connection with, any of
     the  aforesaid  items (1) through (14),  inclusive in this granting  clause
     referenced,  and all other things of value and incident thereto (including,
     without limitation,  any and all liens, lien rights, security interests and
     other properties, rights and interests) which the Trustor might at any time
     have or be entitled to, but excluding any data or contracts with respect to
     which mortgaging or granting of a lien or a security interest is prohibited
     by existing third party agreements,

all the aforesaid properties,  rights and interests, together with any additions
thereto  which  may be  subjected  to the lien  and  security  interest  of this
instrument by means of supplements hereto or otherwise, being hereinafter called
the "Encumbered Property".

     Subject,  however, to (i) Permitted  Encumbrances  (including all presently
existing royalties,  overriding royalties,  payments out of production and other
burdens which are


                                       10


referred to in Exhibit A and which are taken into consideration in computing any
percentage,  decimal or fractional interest as set forth in Exhibit A), (ii) the
assignment of production  contained in Article III hereof,  but only insofar and
so long as said assignment of production is not inoperative under the provisions
of Section 3.5 hereof,  and (iii) the  condition  that none of the Trustee,  the
Agent nor any of the other Lender Parties shall be liable in any respect for the
performance of any covenant or obligation (including without limitation measures
required  to comply  with  Environmental  Laws) of the Trustor in respect of the
Encumbered Property.

     TO HAVE AND TO HOLD the  Encumbered  Property  unto the Trustee  forever to
secure the  payment of the  Indebtedness  and to secure the  performance  of the
obligations of the Trustor herein contained.

     The Trustor,  in  consideration  of the premises and to induce the Agent to
make the loans  above  described,  hereby  covenants  and  agrees  with both the
Trustee and the Agent as follows:

                                   ARTICLE 1

                              Indebtedness Secured
                              --------------------

     1.1 Items of Indebtedness  Secured. The following items of indebtedness are
secured hereby:

          (a) The Loan Notes (including future advances to be made thereunder by
     the Agent or the Lenders), the Letter of Credit Outstandings (as defined in
     the Credit Agreements) and all other obligations and liabilities of Trustor
     under the Credit Agreements,  excluding, however, the Trustor's obligations
     and liabilities under the Hazardous Materials Indemnity;

          (b) All indebtedness  and future advances  evidenced by any promissory
     notes  evidencing any  additional  loans which the Agent or the Lenders may
     from time to time make to  Trustor,  if any,  the Agent and the Lenders not
     being obligated, however, to make such additional loans;

          (c) Any sums  advanced or expenses or costs  incurred by the Trustees,
     the Agent or the Lender Parties,  or by any receiver  appointed  hereunder,
     which are made or incurred  pursuant to, or permitted by, the terms hereof,
     plus  interest  thereon at the rate herein  specified or  otherwise  agreed
     upon,  from the date of the advances or the  incurring of such  expenses or
     costs until reimbursed;

          (d) Any and all other  indebtedness  of  Trustor or any  Affiliate  of
     Trustor to the Agent or any Lender  Party now or hereafter  owing,  whether
     direct or indirect,  primary or secondary,  fixed or  contingent,  joint or
     several,   regardless  of  how  evidenced  or  arising,  including  without
     limitation, all Letters of Credit; and


                                       11


          (e) Any  extensions,  refinancings,  modifications  or renewals of all
     such indebtedness described in subparagraphs (a) through (d) above, whether
     or not Trustor executes any extension agreement or renewal instrument.

     1.2 Indebtedness and the Notes Defined. All the above items of indebtedness
described in subparagraphs (a) through (e) of Section 1.1 hereof are hereinafter
collectively  referred to as the "Indebtedness".  Any promissory note evidencing
any part of the Indebtedness,  including, without limitation, each Loan Note, is
hereinafter  referred  to  as a  "Note",  and  all  such  promissory  notes  are
hereinafter referred to collectively as the "Notes".

                                   ARTICLE 2

                       Particular Covenants and Warranties
                       -----------------------------------
                                 of the Trustor
                                 --------------

     2.1 Payment of the Indebtedness and Performance of Obligations. The Trustor
will duly and  punctually  pay the  Indebtedness,  as and when called for in the
Credit  Agreements  and the  Security  Documents  and on or before the due dates
thereof, and will timely perform and discharge all of the Obligations (including
each and every  obligation  owing on  account of the  Notes),  in full and on or
before the dates same are to be performed and discharged.

     2.2 Certain  Representations  and  Warranties.  The Trustor  represents and
warrants  (and  with  respect  to  those  matters  set  forth  in the  following
subsections  (b) and (f), as to those portions of the  Encumbered  Property that
are operated by persons other than Trustor,  Trustor makes such  representations
and warranty to the best of its knowledge) that

          (a) the oil and gas  leases  described  in Exhibit A hereto are valid,
     subsisting  leases,  superior and paramount to all other oil and gas leases
     respecting the properties to which they pertain,

          (b) all producing  wells  located on the lands  described in Exhibit A
     (including  Exhibit  A-1) have  been  drilled,  operated  and  produced  in
     conformity with all Applicable Laws of all Governmental  Authorities having
     jurisdiction,   and  are  subject  to  no  penalties  on  account  of  past
     production,  and such wells are in fact  bottomed  under and are  producing
     from, and the well bores are wholly within,  the lands described in Exhibit
     A or lands pooled or unitized therewith,

          (c) the Trustor,  to the extent of the interest specified in Exhibit A
     (including  Exhibit A-1), has valid and indefeasible title to each property
     right or interest constituting the Encumbered Property described in Exhibit
     A  (including  Exhibit  A-1) and has a good and  legal  right to grant  and
     convey the same to the Agent; such interest entitles Trustor to receive not
     less than the share of


                                       12


     Hydrocarbons  from such property  indicated as its net revenue  interest or
     "NRI" share of such Hydrocarbons, and obligates Trustor to pay for not more
     than the share of  operating  and other  costs,  liabilities  and  expenses
     associated  with such  property  indicated as its working  interest or "WI"
     share of such costs, liabilities and expenses,

          (d) the  Encumbered  Property is free from all  encumbrances  or liens
     whatsoever,  except for the Permitted  Encumbrances  or as permitted by the
     provisions of Section 2.4(e) hereof,

          (e) the Trustor is not obligated,  by virtue of any  prepayment  under
     any contract  providing for the sale by the Trustor of  Hydrocarbons  which
     contains  a "take or pay"  clause  or under  any  similar  arrangement,  to
     deliver  Hydrocarbons  at some  future  time  without  then  or  thereafter
     receiving full payment therefor,

          (f) the Encumbered  Property is currently being  operated,  maintained
     and developed,  in all material respects, in accordance with all applicable
     currently  existing  Permits,  Legal  Requirements  and all Applicable Laws
     (including, without limitation, Environmental Laws),

          (g) the cover page to this instrument  lists the correct legal name of
     the Trustor and the Trustor has not been known by any legal name  different
     from the one set forth on the cover page of this instrument,  except as set
     forth on Schedule I to this instrument;  the Trustor is not now and has not
     been known by any trade name,  nor has the Trustor  been the subject of any
     merger or other corporate reorganization,

          (h) the  execution,  delivery  and  performance  by the Trustor of the
     Security  Documents and the borrowing  evidenced by the Loan Notes, (i) are
     within the Trustor's  corporate powers and have been duly authorized by the
     Trustor's  Board  of  Directors,   shareholders  and  all  other  requisite
     corporate  action,   (ii)  have  received  all  (if  any)  requisite  prior
     governmental  approval  and  consent  in order to be  legally  binding  and
     enforceable  in  accordance  with the terms  thereof,  and  (iii)  will not
     violate,  be in conflict with,  result in a breach or constitute  (with due
     notice or lapse of time, or both) a default under, any Legal Requirement or
     result in the creation or imposition of any lien,  charge or encumbrance of
     any nature whatsoever upon any of the Trustor's property or assets,  except
     as contemplated by the provisions of the Security  Documents.  The Security
     Documents  constitute  the  legal,  valid and  binding  obligations  of the
     Trustor and others obligated under the terms of the Security Documents,  in
     accordance with their respective terms, and

          (i) there are no  actions,  suits or  proceedings  pending,  or to the
     knowledge of the Trustor  threatened,  against or affecting  the Trustor or
     the Encumbered Property that could materially  adversely affect the Trustor
     or the Encumbered Property,  or involving the validity or enforceability of
     this instrument or the priority of the liens and security interests created
     by the Security


                                       13


     Documents,  and no event has occurred (including specifically the Trustor's
     execution  of the  Security  Documents  and its  consummation  of the Loans
     described  therein) which will violate,  be in conflict with, result in the
     breach  of, or  constitute  (with due  notice or lapse of time,  or both) a
     material default under, any Legal  Requirement or result in the creation or
     imposition of any lien, charge or encumbrance of any nature whatsoever upon
     any of the Trustor's  property other than the liens and security  interests
     created by the Security Documents.

     2.3 Further  Assurances.  The Trustor will  warrant and forever  defend the
Encumbered  Property unto the Trustee against every person  whomsoever  lawfully
claiming the same or any part thereof,  subject to Permitted  Encumbrances,  and
the Trustor will  maintain and  preserve the lien and security  interest  hereby
created so long as any of the  Indebtedness  remains  unpaid.  The Trustor  will
execute and deliver  such other and further  instruments  and will do such other
and  further  acts as,  in the  opinion  of the  Trustee  or the  Agent,  may be
necessary  or  desirable  to carry out more  effectually  the  purposes  of this
instrument,  including,  without  limiting the generality of the foregoing,  (i)
prompt  correction  of any defect which may hereafter be discovered in the title
to the  Encumbered  Property  or in the  execution  and  acknowledgment  of this
instrument, any Note, or any other document executed in connection herewith, and
(ii)  prompt  execution  and  delivery  of all  notices  to  parties  operating,
purchasing  or  receiving  proceeds  of  production  of  Hydrocarbons  from  the
Encumbered  Property,  and all division orders or transfer orders, any of which,
in the opinion of the Agent,  is needed in order to transfer  effectually  or to
assist  in  transferring  effectually  to the  Agent the  assigned  proceeds  of
production from the Encumbered Property.

     2.4 Operation of the Encumbered  Property.  So long as the  Indebtedness or
any part thereof remains unpaid,  and whether or not the Trustor is the operator
of any particular  part of the Encumbered  Property,  the Trustor shall,  at the
Trustor's own expense:

          (a) Do all things necessary to keep unimpaired the Trustor's rights in
     the Encumbered Property and not, except in the ordinary course of business,
     abandon any well or  forfeit,  surrender  or release  any Lease  capable of
     producing  Hydrocarbons  in paying  quantities,  without the prior  written
     consent of the Agent;

          (b) Obtain  and  maintain  all  required  Permits  and cause the lands
     described  in  Exhibit A to be  maintained,  developed,  protected  against
     drainage,  and operated for the  production of  Hydrocarbons  in a good and
     workmanlike  manner as would a prudent  operator,  and in  accordance  with
     generally accepted industry practices,  Joint Operating Agreements, and all
     Applicable Laws, excepting those being contested in good faith;

          (c) Duly  pay and  discharge,  or  cause  to be paid  and  discharged,
     promptly as and when due and payable,  all rentals and royalties (including
     shut-in royalties) payable in respect of the Encumbered  Property,  and all
     expenses  incurred in or arising from the operation or  development  of the
     Encumbered  Property  not later than the due date  thereof,  or the day any
     fine, penalty, interest


                                       14


     or cost may be added thereto or imposed,  or the day any lien may be filed,
     for the non-payment  thereof (if such day is used to determine the due date
     of the respective item);

          (d) Cause the  Operating  Equipment  to be kept in good and  effective
     operating  condition,  ordinary  wear and tear  excepted,  and all repairs,
     renewals,  replacements,  additions  and  improvements  thereof or thereto,
     needful to the  production  of  Hydrocarbons  from the lands  described  in
     Exhibit A, to be promptly made;

          (e) Not, without the prior written consent of the Agent, create, place
     or permit to be created or  placed,  or through  any act or failure to act,
     acquiesce in the placing of, or allow to remain, any mortgage, pledge, lien
     (statutory,  constitutional or contractual), security interest, encumbrance
     or  charge,  or  conditional  sale  or  other  title  retention  agreement,
     regardless  of whether same are expressly  subordinate  to the liens of the
     Security  Documents,  with respect to all or any portion of the  Encumbered
     Property, the Leases or the Rents and Revenues other than (1) the Permitted
     Encumbrances,  (2) Taxes  constituting a lien but not due and payable,  (3)
     defects or  irregularities  in title,  and liens,  charges or encumbrances,
     which,  in the Agent's  reasonable  opinion,  are not such as to  interfere
     materially  with the  development,  operation  or  value of the  Encumbered
     Property  and not such as to affect  materially  title  thereto,  (4) those
     being  contested  by the  Trustor  in good  faith in such  manner as not to
     jeopardize  the Trustee's and the Agent's  rights in and to the  Encumbered
     Property,  (5) those liens  permitted by each Section  8.2.3 of each of the
     Credit  Agreements,  and (6) those  consented  to in  writing by the Agent;

          (f) Carry with financially sound and reputable insurance companies and
     in amounts satisfactory to the Agent the following insurance: (1) workmen's
     compensation  insurance and public  liability and property damage insurance
     in respect of all  activities  in which the Trustor  might  incur  personal
     liability  for the death of or injury to an  employee or third  person,  or
     damage to or destruction of another's property;  and (2) to the extent such
     insurance is carried by similar companies  engaged in similar  undertakings
     in the same  general  areas in which the  Encumbered  Property  is located,
     insurance in respect of the Operating Equipment,  against loss or damage by
     fire, lightning, hail, tornado, explosion and other similar risks, hazards,
     casualties and contingencies  (including  business  interruption  insurance
     covering loss of Rents and Revenues); provided, that any such insurance may
     be provided by way of self  insurance to the extent that similar  companies
     engaged in similar undertakings in the same general areas also self-insure.
     Each insurance  policy issued in connection  therewith shall provide by way
     of  endorsements,  riders  or  otherwise  that (i) name the Agent as a loss
     payee on all property  insurance  policies and an additional insured on all
     liability insurance policies,  and provide that proceeds will be payable to
     the Agent as its = interest may appear,  which proceeds are hereby assigned
     to the Agent,  it being agreed by the Trustor that such  payments  shall be
     applied A) if there be no event of default  existing  or which  would exist
     but for due notice or lapse of time,


                                       15


     or both,  to the  restoration,  repair  or  replacement  of the  Encumbered
     Property,  or B) if there be an event of default  existing,  or which would
     exist but for due  notice or lapse of time,  or both,  at the option of the
     Agent,  either for the above  stated  purpose or toward the  payment of the
     Indebtedness;  (ii) the  coverage  of the Agent  shall  not be  terminated,
     reduced or affected in any manner  regardless of any breach or violation by
     the Trustor of any  warranties,  declarations or conditions in such policy;
     (iii) no such  insurance  policy  shall be canceled,  endorsed,  altered or
     reissued  to effect a change in  coverage  for any reason and to any extent
     whatsoever unless such insurer shall have first given the Agent thirty (30)
     days prior written notice thereof; and (iv) the Agent may, but shall not be
     obligated   to,  make  premium   payments  to  prevent  any   cancellation,
     endorsement,  alteration or reissuance  and such payments shall be accepted
     by the  insurer  to  prevent  same.  The Agent  shall be  furnished  with a
     certificate  evidencing such coverage in form and content acceptable to the
     Agent. All policies to be maintained under this instrument are to be issued
     on forms and by companies  and with  endorsements  acceptable to the Agent.
     The Trustor shall maintain insurance in an amount sufficient to prevent the
     Trustor from becoming a co-insurer under any policy required hereunder.  If
     the Trustor  fails to maintain the level of insurance  required  under this
     instrument, then the Trustor shall and hereby agrees to indemnify the Agent
     to the extent that a casualty occurs and insurance proceeds would have been
     available had such insurance been maintained;

          (g) Furnish to the Agent as soon as possible  and in any event  within
     five (5) days after the  occurrence  from time to time of any change in the
     address of the  Trustor's  location  (as  described on the  signature  page
     hereto) or in the name of the Trustor, notice in writing of such change;

          (h) Not initiate or acquiesce in any change in any material  zoning or
     other land use or Water  Rights  classification  now or hereafter in effect
     and affecting the Encumbered Property or any part thereof;

          (i) Notify the Agent in writing as soon as  possible  and in any event
     within five (5) days after it shall become aware of the  occurrence  of any
     event of default  under  Section 4.1 or any event which,  with notice,  the
     passage of time or both would be such an event of default;

          (j) Appear and defend,  with  counsel  acceptable  to the Agent in its
     reasonable  discretion,  and hold the  Agent  harmless  from,  any  action,
     proceeding  or claim  affecting the  Encumbered  Property or the rights and
     powers of the Agent or the Trustee  under the Security  Documents,  and all
     costs and  expenses  incurred  by the  Agent in  protecting  its  interests
     hereunder in such an event  (including all court costs and attorneys' fees)
     shall be borne by the Trustor;  provided,  that such defense:  (1) shall be
     provided  by a lawyer or law firm  listed on a  schedule  delivered  to and
     approved in writing by the Agent,  from time to time (the "Approved Counsel
     List"), and (2) if the amount in controversy in such action,  proceeding or
     claim is in excess of $2,500,000 in actual or compensatory


                                       16


     damages and/or liquidated damages (or is reasonably believed to exceed such
     amount if the demand involves unliquidated damages), such law firm shall be
     approved by the Agent,  in its reasonable  discretion,  for that particular
     action, proceeding or claim. As to actions, proceedings or claims involving
     a portion of the  Encumbered  Property in which the Trustor or a Subsidiary
     of the Trustor is not the  operator  and with  respect to which the Trustor
     does not have a majority net revenue interest and/or working interest,  the
     Trustor may elect,  in its  reasonable  judgment,  to allow counsel for the
     operator to appear for,  and defend the  Trustor in such  matter,  in which
     case,  selection of counsel by the  operator  shall not be governed by this
     Section 2.4 (j); and further  provided,  that nothing herein shall restrict
     or limit the right of the Agent or the  Lenders  to select its or their own
     counsel to defend, at the Trustor's cost and expense, any action proceeding
     or claim in which any of them are named as parties;

          (k) Subject to the Trustor's  right to contest the same,  promptly pay
     all Taxes  legally  imposed  upon this  instrument  or upon the  Encumbered
     Property or upon the income and profits  thereof,  or upon the  interest of
     the Agent or the other Lender  Parties  therein;  provided that the Trustor
     shall not be liable for taxes  accruing  after a transfer of the Encumbered
     Property following a foreclosure;

          (l) Comply with,  conform to and obey, in all material  respects,  all
     present  and future  Legal  Requirements  and not use,  maintain,  operate,
     occupy,  or allow the use,  maintenance,  operation  or  occupancy  of, the
     Encumbered Property in any manner which (a) violates any present and future
     Legal  Requirement,  (b) may be dangerous unless safeguarded as required by
     Applicable Law, (c)  constitutes a public or private  nuisance or (d) makes
     void,  voidable or  cancelable,  or increases the premium of, any insurance
     then in force with respect thereto; and

          (m) Not, without the prior written consent of the Agent, permit any of
     the  Fixtures  or  Personalty  to be  removed  at any time  from the  lands
     described in Exhibit A unless (i) the removed  item is removed  temporarily
     for maintenance and repair, (ii) if removed permanently,  is replaced by an
     article of equal  suitability  and value,  owned by the  Trustor,  free and
     clear of any lien or security interest except such as may be first approved
     in writing by the Agent or (iii) such Fixtures or Personalty are removed in
     connection  with the plugging and  abandoning of wells,  or  abandonment of
     other facilities, in each case as permitted by this instrument.

     2.5  Performance  of Leases.  The  Trustor  will:  (a) duly and  punctually
perform and comply with any and all representations,  warranties,  covenants and
agreements  expressed  as  binding  upon it under  each of the  Leases;  (b) not
voluntarily  terminate,  cancel or waive its  rights or the  obligations  of any
other party under any of the Leases;  (c) use all reasonable efforts to maintain
each of the Leases in force and effect  during  the full term  thereof;  and (d)
appear in and defend (or cause its  operator to appear in and defend) any action
or proceeding arising under or in any manner


                                       17


connected with any of the Leases or the representations,  warranties,  covenants
and agreements of it or the other party or parties thereto.

     2.6  Recording,  etc.  The  Trustor  will  promptly,  and at the  Trustor's
expense, record,  register,  deposit and file this and every other instrument in
addition or supplemental hereto in such offices and places and at such times and
as often  as may be  necessary  to  preserve,  protect  and  renew  the lien and
security  interest  hereof  as a first  lien  on and  prior  perfected  security
interest  in real or personal  property,  as the case may be, and the rights and
remedies  of the  Trustee,  of the Agent and of the other  Lender  Parties,  and
otherwise will do and observe all things or matters necessary or expedient to be
done or observed by reason of any Applicable Law, for the purpose of effectively
creating,  maintaining  and preserving the lien and security  interest hereof on
and in the Encumbered Property.

     2.7 Sale or Mortgage of the Encumbered Property. Except (a) as set forth in
Section 6.1 of this instrument;  (b) as permitted by each Section 8.2.10 of each
of the Credit Agreements;  (c) for sales of severed Hydrocarbons in the ordinary
course of the  Trustor's  business;  (d) sales of or  dispositions  of  surplus,
obsolete or worn inventory or equipment;  and (e) the lien and security interest
created by this instrument, the Trustor will not sell, convey, mortgage, pledge,
hypothecate,  pool,  unitize or otherwise  dispose of or encumber the Encumbered
Property  nor any portion  thereof,  nor any of the  Trustor's  right,  title or
interest  therein,  without first securing the written consent of the Agent; and
the Trustor will not enter into any arrangement with any gas pipeline company or
other consumer of Hydrocarbons  regarding the Encumbered  Property  whereby said
gas pipeline  company or consumer  may set off any claim  against the Trustor by
withholding payment for any Hydrocarbons actually delivered.

     2.8 Records,  Statements and Reports. The Trustor will keep proper books of
record and account in which  complete  and correct  entries  will be made of the
Trustor's   transactions  in  accordance  with  generally  accepted   accounting
principles  and  will  furnish  or  cause  to be  furnished  to the  Agent  such
information  concerning  the business,  affairs and  financial  condition of the
Trustor as the Agent may from time to time reasonably request.  Without limiting
the generality of the foregoing, the Trustor shall furnish to the Agent upon its
request,  but not more than every six (6)  months,  (a)  reports  prepared by an
independent  petroleum  engineer  acceptable  to the  Agent  concerning  (1) the
quantity of  Hydrocarbons  recoverable  from the  Encumbered  Property,  (2) the
projected income and expense  attributable to the Encumbered  Property,  and (3)
the  expediency of any change in methods of treatment or operation of all or any
wells productive of Hydrocarbons, any new drilling or development, any method of
secondary  recovery  by  repressuring  or  otherwise,  or any other  action with
respect to the  Encumbered  Property,  the  decision as to which may increase or
reduce  the  quantity  of  Hydrocarbons  ultimately  recoverable  or the rate of
production thereof,  and (b) reports showing the gross proceeds from the sale of
Hydrocarbons  produced  from the lands  described  in Exhibit A  (including  any
thereof taken by the Trustor for the  Trustor's  own use),  the quantity of such
Hydrocarbons  sold, the severance,  gross production,  occupation,  or gathering
taxes deducted from or paid out of such proceeds,  the number of wells operated,
drilled or abandoned, and such other information as the


                                       18


Agent may reasonably  request (upon request of the Agent,  such reports referred
to in clauses (a) and (b) above shall set forth such  information  on a lease or
unit  basis,  and  after the  occurrence  of an Event of  Default,  and upon the
Agent's request,  Trustor shall deliver the reports described in clause (b) on a
monthly basis).

     2.9 Right of Entry.

          (a) Upon at least  twenty-four  (24) hours notice to the Trustor,  the
     Trustor  will permit the Agent,  or its agents,  at the cost and expense of
     the Trustor,  to enter upon the Encumbered  Property and all parts thereof,
     for the purpose of investigating and inspecting the condition and operation
     thereof,  and shall permit reasonable access to the field offices and other
     offices  (to the fullest  extent that  Trustor may do so under the terms of
     the applicable Joint Operating  Agreements and other applicable  agreements
     affecting  the  Encumbered  Property),  including  the  principal  place of
     business, of the Trustor to inspect and examine the Encumbered Property and
     to inspect, review and reproduce as necessary any books, records, accounts,
     contracts or other documents of the Trustor.

          (b) Without limiting the generality of the foregoing,  the Agent shall
     have the right (to the  fullest  extent  that  Trustor  may do so under the
     terms of the applicable  Joint  Operating  Agreements and other  applicable
     agreements  affecting the Encumbered  Property),  on twenty-four (24) hours
     prior  notice to the  Trustor,  to cause such  persons and  entities as the
     Agent may  designate  to enter the  Encumbered  Property to conduct (at the
     cost and  expense of the  Trustor),  or to cause the Trustor to conduct (at
     the cost and expense of the Trustor),  such tests and investigations as the
     Agent deems necessary to determine whether any hazardous materials or solid
     waste is being generated, transported, stored, or disposed of in accordance
     with  applicable  Environmental  Laws.  Such tests and  investigations  may
     include, without limitation, underground borings, ground water analyses and
     borings from the floors,  ceilings and walls of any improvements located on
     the Encumbered Property.  This Section 2.9 shall not be construed to affect
     or limit the  obligations  of the  Trustor  pursuant to Section 2.4 hereof.

          (c) The Agent  shall have no duty to visit or observe  the  Encumbered
     Property, or to conduct tests, and no site visit, observation or testing by
     the Agent (or its  agents and  independent  contractors)  shall  impose any
     liability on the Agent or any other Lender Party,  nor shall the Trustor or
     any other obligor be entitled to rely on any visit,  observation or testing
     by the Agent in any respect. The Agent may, in its discretion,  disclose to
     the Trustor or any other Person,  including any Governmental Authority, any
     report or finding  made as a result  of, or in  connection  with,  any site
     visit,  observation  or testing by the Agent.  the Trustor  agrees that the
     Agent  makes no  warranty  or  representation  to the  Trustor or any other
     obligor regarding the truth, accuracy or completeness of any such report or
     findings  that may be so  disclosed.  The Trustor also  acknowledges  that,
     depending upon the results of any site visit, observation or testing by the
     Agent and disclosed to the Trustor, the Trustor may have a legal obligation
     to notify one


                                       19


     or more  Governmental  Authorities  of such  results,  that such  reporting
     requirements  are  site-specific,  and are to be  evaluated  by the Trustor
     without advice or assistance from the Agent.

     2.10 Taxes. Subject to the Trustor's right to contest the same, the Trustor
will  promptly  pay all taxes,  assessments  and  governmental  charges  legally
imposed  upon  this  instrument  or upon the  Encumbered  Property,  or upon the
interest of the Agent therein, or upon the income and profits thereof.

     2.11 No Governmental  Approvals.  The Trustor  represents and warrants that
(a) no approval or consent of any  regulatory  or  administrative  commission or
authority,  or of any other  governmental  body,  is necessary to authorize  the
execution and delivery of this  instrument or of the Notes,  or to authorize the
observance or performance by the Trustor of the covenants herein or in the Notes
contained,  or that such approvals as are required have been obtained or will be
obtained  promptly  and (b) the  Trustor  has  obtained  all  Permits  which are
necessary for the operation of the Encumbered Property.

     2.12 Environmental  Laws. The Trustor represents and warrants,  to the best
of its knowledge after due inquiry, and except as set forth in each Item 7.12 of
the  Disclosure  Schedule  (including  Part B thereof)  attached  to each of the
Credit  Agreements  that:  the  Encumbered  Property is in  compliance  with all
applicable  Environmental Laws; there are no conditions existing currently which
would be likely to subject the Trustor to damages, penalties,  injunctive relief
or cleanup costs under any Environmental  Laws or assertions  thereof,  or which
require or are  likely to require  cleanup,  removal,  remedial  action or other
response  pursuant to  Environmental  Laws by the Trustor;  the Trustor is not a
party to any litigation or administrative proceedings, nor so far as is known by
the Trustor is any litigation or administrative  proceeding  threatened  against
it,  which  asserts or alleges  that the  Trustor has  violated or is  violating
Environmental  Laws or that the Trustor is required to clean up,  remove or take
remedial or other responsive action due to the disposal, depositing,  discharge,
leaking or other release of any hazardous  substances or materials;  neither the
Encumbered Property nor the Trustor is subject to any judgment, decree, order or
citation  related to or arising out of  Environmental  Laws and neither has been
named or listed as a potentially  responsible  party by any governmental body or
agency in a matter  arising under any  Environmental  Laws. The Trustor has also
obtained  all  permits,   licenses  or  approvals   required  under   applicable
Environmental  Laws which are  necessary for its current  exploration,  use, and
development  activities  at  the  Encumbered  Property;  and  to  the  Trustor's
knowledge after reasonable  investigation  all use,  generation,  manufacturing,
release, discharge,  storage, deposit,  treatment,  recycling or disposal of any
materials on, under or at the Encumbered  Property or transported to or from the
Encumbered  Property  (or  tanks or other  facilities  thereon  containing  such
materials)  are  being  and will be  conducted  in  accordance  with  applicable
Environmental Laws including without limitation those requiring cleanup, removal
or any other remedial action.


                                       20


     2.13  Corporate  Status.  The Trustor will continue to be duly qualified to
transact business in California and each state where the conduct of its business
requires it to be qualified.

                                   ARTICLE 3

                            Assignment of Production
                            ------------------------

     3.1 Assignment.

          (a) The Trustor  hereby  absolutely  and  irrevocably  (a)  transfers,
     assigns, warrants and conveys to the Agent, effective as of May 1, 2002, at
     7:00 A.M., local time, all Hydrocarbons which are thereafter  produced from
     and which accrue to the Encumbered  Property,  and all proceeds  therefrom,
     and (b) gives to and confers upon the Agent the right,  power and authority
     to collect such Hydrocarbons and proceeds.  Subject to the terms of Section
     3.1(b),   all  parties   producing,   purchasing   or  receiving  any  such
     Hydrocarbons,  or having such, or proceeds  therefrom,  in their possession
     for which  they or  others  are  accountable  to the Agent by virtue of the
     provisions  of this Article III, are  authorized  and directed to treat and
     regard the Agent as the assignee and transferee of the Trustor and entitled
     in the  Trustor's  place and stead to  receive  such  Hydrocarbons  and all
     proceeds  therefrom;  and  said  parties  and  each of them  shall be fully
     protected  in so  treating  and  regarding  the Agent and shall be under no
     obligation to see to the  application  by the Agent of any such proceeds or
     payments  received by it;  provided,  however,  that, until the Agent shall
     have  instructed  such parties that an Event of Default has occurred and to
     deliver such Hydrocarbons and all proceeds therefrom directly to the Agent,
     such  parties  shall be  entitled  to  deliver  such  Hydrocarbons  and all
     proceeds therefrom directly to the Trustor.  So long as no Event of Default
     shall have occurred, the Agent agrees that the Trustor shall be entitled to
     receive directly from such parties,  and keep and retain, all such proceeds
     from the sale of such Hydrocarbons.

          (b) Upon the  occurrence  of an Event of Default (it being  understood
     that the  determination  of the  occurrence  of an Event of  Default by the
     Agent  shall be  conclusive  and  binding  as to all such  parties  for all
     purposes  hereof  and  that,  at the  time  the  Agent  gives  the  initial
     instruction  and notice under this Article III, such Event of Default shall
     then be continuing) said Hydrocarbons and products are to be delivered into
     pipelines  connected  with  the  oil and gas  leases,  or to the  purchaser
     thereof,  free and clear of all Taxes,  and the  proceeds  from the sale of
     such  Hydrocarbons  paid in accordance with Section 3.6 of this instrument.
     The  Trustor  agrees to  perform  all such acts,  and to  execute  all such
     further  assignments,  transfers and division orders, and other instruments
     as may be  required  or  desired by the Agent or any party in order to have
     said  revenues and proceeds so paid to the Agent,  as and when  provided in
     this  Article III.  With  respect to any funds  received by the Agent after
     notice of an Event of Default shall have been given under this Article III,
     the Agent is fully  authorized  to receive  and give  receipt  for any such
     revenues and proceeds that are received by


                                       21


     Agent;  to endorse  and cash any and all  checks and drafts  payable to the
     order of the Trustor or the Agent for the  account of the Trustor  received
     from or in connection with said revenues or proceeds and apply the proceeds
     thereof in accordance with Section 3.2 hereof,  and to execute transfer and
     division orders in the name of the Trustor,  or otherwise,  with warranties
     binding the Trustor.  The  assignment of the  Hydrocarbons  and proceeds in
     this Section 3.1 is intended to be an absolute  assignment from the Trustor
     to the Agent and not  merely  the  passing  of a  security  interest.  Such
     Hydrocarbons and proceeds are hereby assigned  absolutely by the Trustor to
     the Agent.

     3.2 Application of Proceeds. All payments received by the Agent pursuant to
Section 3.1 hereof shall be placed in a cash collateral account at the Agent and
on the last business day of each calendar month applied as follows:

          First:  To the  payment  and  satisfaction  of all costs and  expenses
     incurred in connection  with the  collection of such  proceeds,  and to the
     payment of all items of the  Indebtedness and the Obligations not evidenced
     by any Note.

          Second:  To the payment of the  interest  on the Notes  accrued to the
     date of such payment.

          Third:  To the payment of the amounts of principal  then due and owing
     on the Notes.

          Fourth:  The  balance,  if any,  shall  either be  applied on the then
     unmatured principal amounts of the Notes, such application to be on such of
     the Notes and  installments  thereof  as the Agent may  select,  or, at the
     option of the Agent, released to the Trustor.

     3.3  Collection  Upon Default.  Upon the occurrence of any event of default
under Section 4.1 hereof,  the Agent may, at any time without notice,  either in
person,  by agent or by a receiver  appointed by a court,  and without regard to
the  adequacy  of any  security  for  the  Indebtedness,  enter  upon  and  take
possession of the Encumbered  Property,  or any part thereof, in its own name or
as agent or as  attorney-in-fact  for the Trustor sue for or  otherwise  collect
such rents, issues, profits, Hydrocarbons and proceeds, including those past due
and  unpaid  and apply the  same,  less  costs and  expenses  of  operation  and
collection, including attorneys' fees, upon any of the Indebtedness, and in such
order as the Agent may determine. The collection of such rents, issues, profits,
Hydrocarbons  and proceeds,  or the entering  upon and taking  possession of the
Encumbered Property, or the application thereof as aforesaid,  shall not cure or
waive any default or notice of default  hereunder or invalidate  any act done in
response to such default or pursuant to notice of default.

     3.4 No Liability of the Agent in Collecting.  The Agent is hereby  absolved
from all liability for failure to enforce collection of any proceeds so assigned
(and no such  failure  shall be  deemed to be a waiver of any right of the Agent
under this Article)


                                       22


and  from  all  other  responsibility  in  connection   therewith,   except  the
responsibility to account to the Trustor for funds actually received.

     3.5  Assignment  Not a Restriction  on the Agent's  Rights.  Nothing herein
contained shall detract from or limit the absolute  obligation of the Trustor to
make payment of the Indebtedness  regardless of whether the proceeds assigned by
this Article are  sufficient to pay the same,  and the rights under this Article
shall be in addition to all other  security now or hereafter  existing to secure
the payment of the Indebtedness.

     3.6 Status of  Assignment.  Notwithstanding  the other  provisions  of this
Article,  and in addition to the other rights hereunder,  the Trustee, the Agent
or any receiver  appointed in judicial  proceedings  for the enforcement of this
instrument  shall  have the  right to  receive  all of the  Hydrocarbons  herein
assigned  and the  proceeds  therefrom  after  the  occurrence  and  during  the
continuance  of any Event of Default and, in any event,  after any Note or other
item of  Indebtedness  has been declared due and payable in accordance  with the
provisions  of Section 4.1 hereof and to apply all of said  proceeds as provided
in Section  3.2  hereof.  Upon any sale of the  Encumbered  Property or any part
thereof  pursuant  to Article V, the rents,  issues,  profits  and  Hydrocarbons
thereafter produced from the property so sold, and the proceeds therefrom, shall
be included in such sale and shall pass to the  purchaser  free and clear of the
assignment contained in this Article.

     3.7 Indemnification  Obligations.  The following provisions shall apply to,
and be deemed in each case to modify,  each of the provisions of this instrument
(except those set forth in Section 2.12 hereof) and the other Security Documents
(except to the extent otherwise  expressly provided therein) wherein the Trustor
is obligated to indemnify each of the Indemnified Persons:

          (a) Trustor  agrees to indemnify the Trustee and the Agent against all
     legal and administrative  proceedings for which a claim for indemnification
     may be  made  by  the  Indemnified  Person  (herein,  collectively,  called
     "Indemnification  Claims")  made against or incurred by them or any of them
     as a consequence  of the  assertion,  either before or after the payment in
     full of the  Indebtedness,  that they or any of them received  Hydrocarbons
     herein  assigned or the proceeds  thereof  claimed by third persons and the
     Agent and the  Trustee  shall  have the right to  defend  against  any such
     Indemnification Claims,  employing attorneys therefor, and unless furnished
     with reasonable indemnity,  they or any of them shall have the right to pay
     or compromise and adjust all such Indemnification  Claims. The Trustor will
     indemnify  and pay to the Trustee or the Agent any and all such  amounts as
     may be paid in respect thereof or as may be successfully  adjudged  against
     the Trustee and the Agent or any of them. The obligations of the Trustor as
     hereinabove  set  forth in this  Section  3.6  shall  survive  the  release
     termination,  foreclosure  or  assignment  of this  instrument  or any sale
     hereunder.

          (b) The Trustor  shall pay when due any  judgments  with respect to an
     Indemnification Claim against any of the Indemnified Persons and which are


                                       23


     rendered  by a final order or decree of a court of  competent  jurisdiction
     from  which no further  appeal  may be taken or has been  taken  within the
     applicable  appeal period.  In the event that such payment is not made, any
     of the  Indemnified  Persons  at its  sole  discretion  may  pay  any  such
     judgments,  in whole or in part, and look to the Trustor for  reimbursement
     pursuant  to this  instrument,  or may  proceed  to file suit  against  the
     Trustor to compel such payment.

          (c) Any amount  which the  Trustor is  obligated  to pay to or for the
     benefit of an Indemnified Person with respect to an Indemnification  Claim,
     but which is not paid when due,  shall bear interest at the default or post
     maturity  rate of  interest  provided  for in the Note  from the date  such
     amount is due until such amount is paid.

                                   ARTICLE 4

                                Events of Default
                                -----------------

     4.1 Events of Default  Hereunder.  In case any one or more of the following
"events of default" shall occur and shall not have been remedied:

          (a) default in the payment of principal of or interest on any Note, or
     in the  payment  of  any  other  Indebtedness  or in  the  performance  and
     discharge of the Obligations secured hereby, when due;

          (b) the  occurrence of an event of default (other than any relating to
     non-payment  of  principal of or interest on the Loan Note) under the terms
     and provisions of either Credit Agreement and the continuance of such event
     of default for the applicable period of grace, if any;

          (c) any warranty or representation  made by Trustor herein shall prove
     to be untrue in any material respect as of the date made or deemed made; or

          (d) failure by Trustor, within the applicable period of grace, if any,
     to cure a default in the due  performance  or observance of any covenant or
     agreement  contained in this Mortgage and not constituting a default in the
     payment of principal of or interest  upon any Note or in the payment of any
     other Indebtedness;

then and in any such event the Agent,  at its  option,  may  declare  the entire
unpaid  principal  of and the  interest  accrued  on the  Notes  and  all  other
Indebtedness secured hereby to be forthwith due and payable,  without any notice
or demand of any kind, both of which are hereby expressly waived.


                                       24


                                   ARTICLE 5

                           Enforcement of the Security
                           ---------------------------

     5.1 Acceleration Upon Default;  Additional Remedies. Upon the occurrence of
an event of default and declaration by the Agent of the entire unpaid  principal
of and the  interest  accrued  on the Notes and all other  Indebtedness  secured
hereby to be forthwith due and payable, the Agent may:

          (a) Commence an action to  foreclose  this  instrument  as a mortgage,
     appoint a receiver, or specifically enforce any of the covenants hereof.

          (b) Exercise any or all of the remedies  available to a secured  party
     under the Uniform  Commercial  Code of the State of California,  including,
     but not limited to:

               (i) Either personally or by means of a court appointed  receiver,
          take possession of all or any of the personal property  constituting a
          part of the Encumbered  Property and exclude therefrom the Trustor and
          all others  claiming under the Trustor,  and thereafter  hold,  store,
          use,   operate,   manage,   maintain   and  control,   make   repairs,
          replacements,  alterations, additions and improvements to and exercise
          all  rights and  powers of the  Trustor  in  respect of such  personal
          property  or any part  thereof.  In the  event the  Agent  demands  or
          attempts to take possession of such personal  property in the exercise
          of any rights under the Credit  Agreements or any document executed in
          connection therewith, the Trustor promises and agrees promptly to turn
          over and deliver complete possession thereof to the Agent;

               (ii)  Without  notice to or demand  upon the  Trustor,  make such
          payments  and do such acts as the Agent may deem  necessary to protect
          its security  interest in such personal  property,  including  without
          limitation,   paying,  purchasing,   contesting  or  compromising  any
          encumbrance,  charge  or lien  which is prior  to or  superior  to the
          security interest granted hereunder, and in exercising any such powers
          or authority to pay all expenses incurred in connection therewith;

               (iii) Require the Trustor to assemble  such personal  property or
          any portion thereof, at a place designated by the Agent and reasonably
          convenient  to both  parties,  and promptly to deliver  such  personal
          property to the Agent, or an agent or representative designated by it.
          The Agent, and its agents and representatives  shall have the right to
          enter  upon  any or all of the  Trustor's  premises  and  property  to
          exercise the Agent's rights hereunder;

               (iv)  Elect  to treat  the  fixtures  constituting  a part of the
          Encumbered Property as either real property collateral or personal



                                       25


          property  collateral and then proceed to exercise such rights as apply
          to such type of collateral; and

               (v) Sell, lease or otherwise dispose of such personal property at
          public  sale,  with or without  having such  personal  property at the
          place of sale, and upon such terms and in such manner as the Agent may
          determine, and the Agent may be a purchaser at any such sale.

     Unless  such  personal  property  is  perishable  or  threatens  to decline
speedily in value or is of a type customarily sold on a recognized  market,  the
Agent shall give the Trustor at least ten (10) days prior written  notice of the
time and place of any public sale of such  personal  property or other  intended
disposition thereof. Such notice may be mailed to the Trustor at the address set
forth on the signature page(s) of this instrument.

          (c) Deliver to the Trustee a written declaration of default and demand
     for  sale,  and a written  notice  of  default  and  election  to cause the
     Trustor's interest in the Encumbered  Property to be sold, which notice the
     Trustee  or the  Agent  shall  cause to be duly  filed  for  record  in the
     Official Records of the county or counties in which the Encumbered Property
     is located.

          (d) Any other remedy permitted to be exercised by the beneficiary of a
     deed of trust or a  secured  party or both  under  the laws of the State of
     California.

     5.2  Foreclosure  By Power of Sale.  Should the Agent elect to foreclose by
exercise  of the power of sale  herein  contained,  the Agent  shall  notify the
Trustee and shall  deposit  with the Trustee this  instrument  and the Notes and
such  receipts  and  evidence of  expenditures  made and  secured  hereby as the
Trustee may require.

          (a) Upon  receipt of such  notice from the Agent,  the  Trustee  shall
     cause to be recorded, published and delivered to the Trustor such Notice of
     Default  and  Election  to  Sell  as  then  required  by law  and  by  this
     instrument.  The Trustee shall, without demand on the Trustor,  after lapse
     of such time as may then be required by law and after  recordation  of such
     Notice of Default and after Notice of Sale having been given as required by
     law, sell the Encumbered Property at the time and place of sale fixed by it
     in said Notice of Sale,  either as a whole,  or in separate lots or parcels
     or items as the Trustee shall deem  expedient,  and in such order as it may
     determine, at public auction to the highest bidder for cash in lawful money
     of the United States payable at the time of sale. The Trustee shall deliver
     to such  purchaser or purchasers  thereof its good and  sufficient  deed or
     deeds conveying the property so sold, but without any covenant or warranty,
     express or implied. The recitals in such deed of any matters or facts shall
     be conclusive proof of the  truthfulness  thereof.  Any person,  including,
     without limitation,  the Trustor, the Trustee or the Agent, may purchase at
     such sale and Trustor  hereby  covenants to warrant and defend the title of
     such purchaser or purchasers.


                                       26


          (b) After deducting all costs, fees and expenses of the Trustee and of
     this Trust,  including  costs of evidence of title in connection with sale,
     the  Trustee  shall  apply the  proceeds  of sale to  payment  of: all sums
     expended under the terms hereof, not then repaid,  with accrued interest at
     the  highest  rate of  interest  from  time-to-time  accruing  under and as
     provided in the Credit  Agreements;  all other sums then secured hereby and
     the remainder, if any, to the person or persons legally entitled thereto.

          (c)  The  Trustee  may  postpone  sale  of all or any  portion  of the
     Encumbered  Property by public announcement at such time and place of sale,
     and  from  time  to time  thereafter  may  postpone  such  sale  by  public
     announcement   at  the  time  fixed  by  the  preceding   postponement   or
     subsequently noticed sale, and without further notice make such sale at the
     time fixed by the last postponement,  or may, in its discretion, give a new
     notice of sale.

     5.3  Appointment of Receiver.  If an event of default  described in Section
4.1 of this  instrument  shall have occurred and be continuing,  the Agent, as a
matter of right and without  notice to the Trustor or anyone  claiming under the
Trustor,  and without regard to the then value of the Encumbered Property or the
interest  of the  Trustor  therein,  shall  have the right to apply to any court
having  jurisdiction  to  appoint a  receiver  or  receivers  of the  Encumbered
Property,  and the Trustor hereby  irrevocably  consents to such appointment and
waives notice of any application therefor.  Any such receiver or receivers shall
have all the usual powers and duties of  receivers in like or similar  cases and
all the powers and duties of the Agent in case of entry as  provided  in Section
5.4 of this  instrument  and shall continue as such and exercise all such powers
until the date of  confirmation  of sale of the Encumbered  Property unless such
receivership is sooner terminated.

     5.4  Operation  of the  Encumbered  Property  by the Agent.  If an event of
default  described in Section 4.1 of this instrument  shall have occurred and be
continuing,  and in addition to all other rights herein  conferred on the Agent,
the Agent (or any person,  firm or  corporation  designated  by the Agent) shall
have the right and  power,  but shall not be  obligated,  to enter upon and take
possession of any of the Encumbered  Property,  and to exclude the Trustor,  and
the  Trustor's  agents  or  servants,   wholly  therefrom,  and  to  hold,  use,
administer,  manage and operate the same to the extent that the Trustor shall be
at the time entitled and in its place and stead. The Agent, or any person,  firm
or  corporation  designated  by the Agent,  may  operate  the same  without  any
liability  to the  Trustor in  connection  with such  operations,  except to use
ordinary care in the operation of such properties,  and the Agent or any person,
firm or  corporation  designated by the Agent,  shall have the right to collect,
receive and receipt for all rents,  issues,  profits and Hydrocarbons  from said
properties, to make repairs, purchase machinery and equipment, conduct work-over
operations,  drill  additional  wells and to  exercise  every  power,  right and
privilege of the Trustor with respect to the  Encumbered  Property.  When and if
the expenses of such operation and development  (including costs of unsuccessful
work-over  operations or additional  wells) have been paid and the  Indebtedness
paid,  said  properties  shall,  if there  has been no sale or  foreclosure,  be
returned to the Trustor.


                                       27


     5.5 The Trustor's  Waiver of Rights.  The Trustor waives the benefit of all
laws  now  existing  or that  hereafter  may be  enacted  providing  for (i) any
appraisement before sale of any portion of the Encumbered Property, and (ii) the
benefit of all laws that may be hereafter  enacted in any way extending the time
for the enforcement of the collection of the Notes or the debt evidenced thereby
or creating or extending a period of redemption from any sale made in collecting
said debt. To the full extent the Trustor may do so, the Trustor agrees that the
Trustor  will not at any time insist upon,  plead,  claim or take the benefit or
advantage of any law now or hereafter in force  providing for any  appraisement,
valuation,  stay, extension or redemption, and the Trustor, for the Trustor, the
Trustor's heirs, devisees, representatives,  successors and assigns, and for any
and all persons ever claiming any interest in the  Encumbered  Property,  to the
extent  permitted by law,  hereby waives and releases all rights of  redemption,
valuation,  appraisement,  stay of  execution,  notice of  election to mature or
declare due the whole of the secured  indebtedness  and marshalling in the event
of  foreclosure  of the liens  hereby  created.  If any law  referred to in this
Section and now in force, of which the Trustor,  the Trustor's heirs,  devisees,
representatives,  successors  and assigns or other person  might take  advantage
despite this Section,  shall hereafter be repealed or cease to be in force, such
law shall not thereafter be deemed to preclude the  application of this Section.
The Trustor  expressly  waives and  relinquishes any and all rights and remedies
which  the  Trustor  may have or be able to  assert by reason of the laws of the
State of California pertaining to the rights and remedies of sureties.

     5.6 Remedies Not  Exclusive.  The Trustee and the Agent,  and each of them,
shall be entitled to enforce  payment and  performance  of any  Indebtedness  or
obligations  secured  hereby and to  exercise  all rights and powers  under this
instrument or under the Credit Agreements or other agreements or any laws now or
hereafter  in  force,  notwithstanding  some  or  all of  the  Indebtedness  and
obligations secured hereby may now or hereafter be otherwise secured, whether by
mortgage,  deed of trust,  pledge,  lien,  assignment or otherwise.  Neither the
acceptance of this  instrument  nor its  enforcement  whether by court action or
pursuant to the power of sale or other powers herein contained,  shall prejudice
or in any manner  affect the  Trustee's or the Agent's  right to realize upon or
enforce any other security now or hereafter held by the Trustee or the Agent, it
being agreed that the Trustee and the Agent, and each of them, shall be entitled
to enforce this  instrument  and any other security now or hereafter held by the
Agent or the  Trustee  in such order and manner as they or either of them may in
their absolute discretion determine. No remedy herein conferred upon or reserved
to the  Trustee or the Agent is  intended to be  exclusive  of any other  remedy
herein or by law provided or permitted,  but each shall be cumulative  and shall
be in  addition  to every  other  remedy  given  hereunder  or now or  hereafter
existing at law or in equity or by statute.  Every power or remedy  given by the
Credit  Agreements  or any  document  executed in  connection  therewith  to the
Trustee or the Agent or to which either of them may be otherwise  entitled,  may
be exercised,  concurrently or independently,  from time to time and as often as
may be deemed  expedient  by the  Trustee  or the  Agent and  either of them may
pursue inconsistent remedies.


                                       28


                                   ARTICLE 6

                            Miscellaneous Provisions
                            ------------------------

     6.1  Pooling and  Unitization.  The  Trustor  shall have the right,  and is
hereby authorized,  to pool or unitize all or any part of the lands described in
Exhibit A, insofar as relates to the Encumbered  Property,  with adjacent lands,
leaseholds and other interests, when, in the reasonable judgment of the Trustor,
it is  necessary  or  advisable  to do so in  order  to form a  drilling  and/or
production  unit to  facilitate  the  orderly  development  of that  part of the
Encumbered  Property affected thereby, or to comply with the requirements of any
Applicable Law or  governmental  order or regulation  relating to the spacing of
wells or proration of the production therefrom; provided, however, that any unit
so formed for the  production of oil shall not  substantially  exceed 160 acres,
and any unit so formed for the production of gas shall not substantially  exceed
640 acres,  unless a larger area is required to conform to an Applicable  Law or
governmental  order or regulation  relating to the spacing of wells or to obtain
the maximum allowable  production under any Applicable Law or governmental order
or regulation  relating to the proration of  production  therefrom;  and further
provided  that  the  Hydrocarbons  produced  from any  unit so  formed  shall be
allocated among the separately owned tracts or interests  comprising the unit in
a uniform manner consistently  applied.  Any unit so formed may relate to one or
more zones or horizons,  and a unit formed for a particular zone or horizon need
not conform in area to any other unit  relating to a different  zone or horizon,
and a unit  formed for the  production  of oil need not conform in area with any
unit formed for the production of gas.  Immediately  after formation of any such
unit,  the Trustor shall furnish to the Trustee and the Agent a true copy of the
pooling  agreement,  declaration  of pooling or other  instrument  creating such
unit, in such number of  counterparts as the Trustee or the Agent may reasonably
request.  The interest in any such unit attributable to the Encumbered  Property
(or any part thereof)  included  therein  shall become a part of the  Encumbered
Property and shall be subject to the lien hereof in the same manner and with the
same effect as though such unit and the  interest  of the Trustor  therein  were
specifically  described  in Exhibit  A. The  Trustor  may enter into  pooling or
unitization  agreements not  hereinabove  authorized only with the prior written
consent of the Agent, which consent shall not be unreasonably withheld.

     6.2 No  Liability.  The  Trustee  and the Agent shall not be liable for any
error of judgment or act done by the Trustee and the Agent in good faith,  or be
otherwise responsible or accountable under any circumstances whatsoever,  except
for their  negligence  or bad  faith.  The  Trustee  and the Agent  shall not be
personally  liable in case of entry by them, or anyone entering by virtue of the
powers herein granted them, upon the Encumbered Property for debts contracted or
liability or damages  incurred in the  management or operation of the Encumbered
Property.  the  Trustee  and the  Agent  shall  have  the  right  to rely on any
instrument,  document or signature authorizing or supporting any action taken or
proposed  to be taken by them  hereunder,  believed  by them in good faith to be
genuine. The Trustee shall be entitled to reimbursement for expenses incurred by
them in the performance of their duties hereunder and to reasonable compensation
for such of their services hereunder as shall be rendered.


                                       29


Trustor will, from time to time, pay the compensation due to the Trustee and the
Agent  hereunder  and  reimburse  the Trustee  and the Agent for,  and save them
harmless  against,  any and all liability and expenses  which may be incurred by
them in the performance of their duties.

     6.3 Successor Trustees.  Any Trustee may resign in writing addressed to the
Agent or be  removed  at any time  with or  without  cause by an  instrument  in
writing duly executed by the Agent.  In case of the  resignation or removal of a
Trustee,  one or more  successor  Trustees  may be  appointed  by the  Agent  by
instrument of  substitution  complying with any applicable  requirements of law,
and  in the  absence  of any  such  requirement  without  formality  other  than
appointment and designation in writing.  Such appointment and designation  shall
be full  evidence of the right and  authority  to make the same and of all facts
therein  recited,  and upon the making of any such  appointment  and designation
this conveyance  shall vest in the named  successor  Trustee or Trustees all the
estate and title of the prior Trustee in all of the Encumbered Property,  and he
or  they  shall  thereupon  succeed  to  all  the  rights,  powers,  privileges,
immunities and duties hereby  conferred  upon the prior Trustee.  All references
herein to the Trustee  shall be deemed to refer to the Trustee from time to time
acting hereunder.

     6.4  Actions  or  Advances  by the  Agent or the  Trustee.  Each and  every
covenant  herein  contained shall be performed and kept by the Trustor solely at
the  Trustor's  expense.  If  the  Trustor,  following  notice  and  demand  for
performance  from the Agent or the Trustee but without  prejudice to the Agent's
rights under Articles IV and V hereof,  shall fail to perform or keep any of the
covenants of whatsoever kind or nature contained in this instrument,  the Agent,
or the  Trustee  or any  receiver  appointed  hereunder,  may,  but shall not be
obligated  to,  take  action  and/or  make  advances  to perform the same in the
Trustor's  behalf,  and the Trustor  hereby  agrees to repay the expense of such
action and such  advances  upon demand plus  interest at an annual rate equal to
the Alternate  Base Rate (as defined in the Credit  Agreements) of interest from
time to time accruing on the Notes plus the Applicable Margin (as defined in the
Credit  Agreements)  plus two  percent  (2%)  until  paid or,  in the  event any
promissory  note  evidences  such  indebtedness,  upon the terms and  conditions
thereof.  No such  advance or action by the Agent,  the Trustee or any  receiver
appointed  hereunder  shall be deemed to relieve  the  Trustor  from any default
hereunder.

     6.5  Defense of Claims.  The  Trustor  will  notify the Agent,  in writing,
promptly of the  commencement  of any legal  proceedings  affecting the lien and
security interest hereof or the Encumbered  Property,  or any part thereof,  and
will take such action,  employing  attorneys as set forth in Section 2.4 (j), as
may be necessary or appropriate to preserve the Trustor's, the Trustee's and the
Agent's  rights  affected  thereby  and/or to hold  harmless the Trustee and the
Agent in respect of such  proceedings;  and should the Trustor fail or refuse to
take any such action,  the Trustee or the Agent may,  upon giving prior  written
notice thereof to the Trustor, take such action in behalf and in the name of the
Trustor  and at the  Trustor's  expense.  Moreover,  the Agent or the Trustee on
behalf of the Agent, may take such independent action in connection therewith as
the Agent may in its discretion  deem proper,  the Trustor hereby  agreeing that
all sums  advanced or all expenses  incurred in such actions plus interest at an
annual rate equal


                                       30


to the  Alternate  Base Rate (as defined in the Credit  Agreements)  of interest
from  time to time  accruing  on the Loan Note plus the  Applicable  Margin  (as
defined in the Credit  Agreements)  plus two percent (2%) until paid,  will,  on
demand, be reimbursed, as appropriate, to the Agent, the Trustee or any receiver
appointed  hereunder or under  Applicable Law. The obligations of the Trustor as
hereinabove   set  forth  in  this  Section  6.3  shall   survive  the  release,
termination, foreclosure or assignment of this instrument or any sale hereunder.

     6.6 Trustee's Powers. At any time, or from time to time,  without liability
therefor and without notice,  upon written request of the Agent and presentation
of this  instrument  and the Notes secured hereby for  endorsement,  and without
affecting the Trustor's personal liability or the effect of this instrument upon
the remainder of the Encumbered Property,  the Trustee may (a) reconvey any part
of the Encumbered  Property,  (b) consent in writing to the making of any map or
plat  thereof,  (c) join in granting  any easement  thereon,  or (d) join in any
extension agreement or any agreement subordinating the lien or security interest
hereof.

     6.7 Agent's  Powers.  Without  affecting  the liability of any other person
liable  for the  payment  of the  Indebtedness  herein  mentioned,  and  without
affecting  perfection  or  priority  of the lien or  security  interest  of this
instrument  against or in any  portion of the  Encumbered  Property  not then or
theretofore  released as security for the full amount of all unpaid obligations,
the Agent may,  from time to time and  without  notice (a) release any person so
liable,  (b)  extend  the  maturity  or  alter  any of  the  terms  of any  such
obligation, (c) grant other indulgences, (d) release or reconvey, or cause to be
released or reconveyed at any time at the Agent's option, any parcel, portion or
all of the  Encumbered  Property,  (e) take or release  any other or  additional
security for any obligation herein mentioned,  or (f) make compositions or other
arrangements with debtors in relation thereto.

     6.8 Reconveyance by the Trustee.  Upon written request of the Agent stating
that all sums  secured  hereby  have  been  paid,  and  upon  surrender  of this
instrument and the Notes to the Trustee for  cancellation and retention and upon
payment by the Trustor of the Trustee's  fees, the Trustee shall reconvey to the
Trustor,   or  the  person  or  persons  legally   entitled   thereto,   without
representation  or warranty,  any portion of the  Encumbered  Property then held
hereunder.  The recitals in such  reconveyance  of any matters or facts shall be
conclusive  proof of the truthfulness  thereof.  The grantee in any reconveyance
may be described as "the person or persons legally entitled thereto".

     6.9  Effect  of  Partial  Release  or  Reconveyance.  If there is a partial
release  or  reconveyance  by the  Trustee  of  any  portion  of the  Encumbered
Property,  the Trustee and the Agent may look to the remainder of the Encumbered
Property  as  security  for  the  full  payment  of  the  Notes  and  all  other
Indebtedness secured by this instrument.

     6.10 Subrogation.  To the extent that proceeds of the Indebtedness are owed
to pay any outstanding lien, charge or prior encumbrance  against the Encumbered
Property,  such  proceeds  have  been or will be  advanced  by the  Agent at the
Trustor's


                                       31


request and the Agent shall be  subrogated  to any and all rights and liens owed
by  any  owner  or  holder  of  such  outstanding   liens,   charges  and  prior
encumbrances,  irrespective of whether said liens,  charges or encumbrances  are
released.

     6.11 No Merger.  If both the lessor's and lessee's  estates under any lease
or any portion thereof which constitutes a part of the Encumbered Property shall
at any  time  become  vested  in one  owner,  this  instrument  and the lien and
security  interest  created  hereby  shall not be  destroyed  or  terminated  by
application  of the  doctrine  of merger  and,  in such  event,  the Agent shall
continue to have and enjoy all of the rights and  privileges  of the Agent as to
the separate estates. In addition, upon the foreclosure of the lien and security
interest created by this instrument on the Encumbered  Property  pursuant to the
provisions  hereof,  any leases or  subleases  then  existing and created by the
Trustor shall not be destroyed or terminated by application of the law of merger
or as a matter of law or as a result of such foreclosure unless the Agent or any
purchaser at any such foreclosure sale shall so elect. No act by or on behalf of
the Agent or any such purchaser  shall  constitute a termination of any lease or
sublease unless the Agent or such purchaser shall give written notice thereof to
such tenant or subtenant.

     6.12 Renewals,  Amendments and Other  Security.  Renewals and extensions of
the Indebtedness  and  modifications of any kind of the Obligations may be given
at any time and amendments may be made to agreements with third parties relating
to any part of such  Indebtedness  or the  Trustee and the Agent may take or may
now hold other security for the  Indebtedness,  all without notice to or consent
of the  Trustor.  If an  event  of  default  described  in  Section  4.1 of this
instrument  shall have  occurred and be  continuing,  amendments  may be made to
agreements  relating to any part of the Indebtedness or the Encumbered  Property
without notice to or consent of the Trustor. The Trustee or the Agent may resort
first to such other security or any part thereof or first to the security herein
given or any part thereof,  or from time to time to either or both,  even to the
partial or complete abandonment of either security, and such action shall not be
a waiver of any rights conferred by this  instrument,  which shall continue as a
first lien upon and prior perfected security interest in the Encumbered Property
not expressly released until the Notes and all other Indebtedness secured hereby
are fully paid.

     6.13 Construction of this Instrument as an Assignment, etc. This instrument
shall be deemed to be and may be  enforced  from time to time as an  assignment,
chattel mortgage,  contract,  deed of trust,  financing  statement,  real estate
mortgage,  or  security  agreement,  and  from  time  to time as any one or more
thereof.

     6.14 Limitation on Interest.  It is the intent of the Trustor and the Agent
in the  execution  of this  instrument  and the Notes and all other  instruments
securing  payment of the Notes to contract in strict  compliance  with the usury
laws of the State of California and any other jurisdiction whose laws may govern
the loan(s)  evidenced by the Notes. In furtherance  thereof,  the Agent and the
Trustor  stipulate and agree that none of the terms and provisions  contained in
the Credit  Agreements or any document  executed in connection  therewith  shall
ever be construed to create a contract for the use,  forbearance or detention of
money requiring payment of interest at a rate in excess of


                                       32


the maximum  interest  rate  permitted to be charged by the laws of the State of
California or any other  jurisdiction  whose laws may govern the loans evidenced
by the Notes.  The  Trustor or any  guarantor,  endorser  or other  party now or
hereafter becoming liable for the payment of the Notes shall never be liable for
unearned  interest on the Notes and shall  never be required to pay  interest on
the Notes at a rate in  excess  of the  maximum  interest  that may be  lawfully
charged  under the laws of the  State of  California  or any other  jurisdiction
whose laws may govern the loans  evidenced  by the Notes and the  provisions  of
this Section shall control over all other  provisions of the Notes and any other
instrument  executed in connection  herewith  which may be in apparent  conflict
herewith.  In the event any holder of the Notes shall  collect  monies which are
deemed to  constitute  interest  which would  otherwise  increase the  effective
interest  rate on the Notes to a rate in excess of that  permitted to be charged
by the laws of the State of California or any other  jurisdiction whose laws may
govern the loans  evidenced  by the Notes,  all such sums  deemed to  constitute
interest  in excess of the  legal  rate  shall be  immediately  returned  to the
Trustor upon such determination.

     6.15 Unenforceable  Provisions.  If any provision hereof or of the Notes is
invalid or  unenforceable  in the State of California  or  otherwise,  the other
provisions hereof or of the Notes shall remain in full force and effect, and the
remaining provisions hereof shall be liberally construed in favor of the Trustee
and the Agent in order to effectuate the provisions hereof.

     6.16 Waiver by the Agent. Any and all covenants in this instrument may from
time to time by  instrument  in  writing  signed  by the Agent be waived to such
extent and in such manner as the Agent may desire, but no such waiver shall ever
affect or impair either the Trustee's or the Agent's rights or liens or security
interests  hereunder,  except to the extent  specifically stated in such written
instrument.

     6.17  Successors and Assigns.  This instrument is binding upon the Trustor,
the  Trustor's  successors  and  assigns,  and shall inure to the benefit of the
Trustee,  its  successors,  and the Agent,  its successors and assigns,  and the
provisions hereof shall likewise be covenants running with the land.

     6.18 Article and Section Headings. The article and section headings in this
instrument are inserted for convenience of reference and shall not be considered
a part of this instrument or used in its interpretation.

     6.19  Execution in  Counterparts.  This  instrument  may be executed in any
number of counterparts,  each of which shall for all purposes be deemed to be an
original and all of which are identical,  except that, to facilitate recordation
or filing,  in any  particular  counterpart  portions of Exhibit A hereto  which
describe  properties  situated in  counties  other than the county in which such
counterpart is to be recorded or filed may have been omitted.

     6.20 Special Filing as Financing Statement.  This instrument shall likewise
be a security  agreement and a financing  statement.  This  instrument  shall be
filed for record,  among other places, in the real estate records of each county
in which any part


                                       33


of the real  property  covered by the oil and gas leases  described in Exhibit A
hereto is situated,  and,  when filed in such  counties  shall be effective as a
financing  statement covering fixtures located on oil and gas properties,  which
oil and gas properties  (and accounts  arising  therefrom) are to be financed at
the wellheads of the wells  located on the real property  described in Exhibit A
hereto. A portion of the goods encumbered hereby are, or are to become, fixtures
as that term is defined in Section  9313 of the Uniform  Commercial  Code of the
State of California. At the option of the Agent, a carbon, photographic or other
reproduction  of this  instrument  or of any  financing  statement  covering the
Encumbered  Property or any portion  thereof  shall be sufficient as a financing
statement and may be filed as such.

     6.21 Notices. Any notice,  request, demand or other instrument which may be
required or  permitted  to be given or served upon the Trustor  pursuant to this
instrument  shall  be  sufficiently  given  and  deemed  given  when  mailed  by
first-class  mail,  addressed  to the  Trustor at the  address  shown  below the
signatures  at the end of this  instrument or to such  different  address as the
Trustor shall have designated by written notice received by the Agent.

     6.22 Request for Notice.  The Trustor hereby  requests a copy of any notice
of default and that any notice of sale  hereunder be mailed to it at the address
set forth on the signature page(s) of this instrument.

     6.23  Statements  by the Trustor.  The Trustor,  within ten (10) days after
being  given  notice by mail,  will  furnish  to the  Agent a written  statement
stating the unpaid  principal of and interest on the Notes and any other amounts
secured by this  instrument  and stating  whether  any offset or defense  exists
against such principal and interest.

     6.24  Acceptance by the Trustee.  The Trustee  accepts this Trust when this
instrument, duly executed and acknowledged,  is made a public record as provided
by law.

     6.25 Release and Waiver. The Trustor hereby waives and releases any and all
rights of contribution,  reimbursement or indemnity it has or may hereafter have
against the Trustee and/or the Agent arising from or relating to this instrument
and/or  the  Encumbered   Property,   including  without  limitation  claims  or
liabilities  relating to  Environmental  Laws.  Notwithstanding  anything to the
contrary  set  forth  in  this  instrument  or  any  other  Loan  Document,  the
obligations  and  liabilities of the Trustor under and pursuant to the Hazardous
Materials   Undertaking  and  Unsecured   Indemnity  are  not  secured  by  this
instrument.

     6.26 No Partnership.  Nothing  contained in this instrument is intended to,
or shall be construed as,  creating to any extent and in any manner  whatsoever,
any partnership,  mining  partnership,  joint venture,  or association among the
Trustor,  the Trustee  and the Agent,  or in any way as to make the Agent or the
Trustee  co-principals  with  the  Trustor  with  reference  to  the  Encumbered
Property, and any inferences to the contrary are hereby expressly negated.


                                       34


     6.27 Conflict with the Agreement.  In the case of  irreconcilable  conflict
between the provisions of this instrument and those of either Credit  Agreement,
the provisions of the applicable Credit Agreement shall control.

     6.28 The Agent as Agent.  As described  above,  certain  Affiliates  of the
Agent or a Lender,  are or may become parties to certain Hedging Agreements with
the Trustor  and/or  Affiliates  of the  Trustor.  This  instrument  secures the
obligations of the Trustor and such  Affiliates,  as the case may be, under such
Hedging Agreements,  and the parties acknowledge for all purposes that the Agent
acts for  itself and as agent on behalf of such  Affiliates  of the Agent or any
Lender which are so entitled to share in the rights and benefits accruing to the
Agent under this instrument in respect of the Encumbered Property.


                                       35




     IN WITNESS WHEREOF,  the Trustor has executed or caused to be executed this
Deed of Trust with Power of Sale, Assignment of Production,  Security Agreement,
Financing  Statement and Fixtures  Filing on the day, month and year first above
written.

                               TRUSTOR AND DEBTOR


                                       CALPINE CORPORATION, a Delaware
                                       corporation



                                       By:______________________________________
                                          Title: _______________________________
                                          Printed Name: ________________________






The name and mailing address of the Trustor and Debtor is:

Calpine Corporation
1000 Louisiana Street, Suite 800
Houston, TX 77002


                                                              [CA Deed of Trust]




                          BENEFICIARY AND SECURED PARTY
                          -----------------------------


                                       THE BANK OF NOVA SCOTIA, as Agent



                                       By:______________________________________
                                          Title:  Managing Director
                                          Printed Name:  Jon Burckin





The name and mailing address of the Secured Party and Beneficiary is:

The Bank of Nova Scotia, as Agent
580 California Street
Suite 2100
San Francisco, CA 94104






The mailing  address of the additional  Secured Party,  Chicago Title  Insurance
Company, as Trustee, is:

Chicago Title Insurance Company
5300 California Avenue
Bakersfield, California 93309
Attention:


                                                              [CA Deed of Trust]




                                   CALIFORNIA
                                 ACKNOWLEDGMENT

STATE OF _____________________)

COUNTY OF ____________________)


On __________________ before me, __________________________,  a Notary Public in
and for said County and State,  personally appeared  __________________________,
personally  known to me (or proved to me on the basis of satisfactory  evidence)
to be the person(s) whose name(s) is/are subscribed to the within instrument and
acknowledged  to  me  that  he/she/they   executed  the  same  in  his/her/their
authorized  capacity(ies),   and  that  by  his/her/their  signature(s)  on  the
instrument  the  person(s),  or the entity  upon  behalf of which the  person(s)
acted, executed the instrument.

WITNESS my hand and official seal.

(SEAL)

         Signature:________________________
                   Notary Public


                                                              [CA Deed of Trust]




                                   CALIFORNIA
                                 ACKNOWLEDGMENT

STATE OF _____________________)

COUNTY OF ____________________)


On __________________ before me, __________________________,  a Notary Public in
and for said County and State, personally appeared Jon Burckin, personally known
to me  (or  proved  to me on  the  basis  of  satisfactory  evidence)  to be the
person(s)  whose  name(s)  is/are   subscribed  to  the  within  instrument  and
acknowledged  to  me  that  he/she/they   executed  the  same  in  his/her/their
authorized  capacity(ies),   and  that  by  his/her/their  signature(s)  on  the
instrument  the  person(s),  or the entity  upon  behalf of which the  person(s)
acted, executed the instrument.

WITNESS my hand and official seal.

(SEAL)

         Signature:________________________
                   Notary Public


                                                              [CA Deed of Trust]




                 SCHEDULE I To Deed Of Trust With Power Of Sale,
                  Assignment Of Production, Security Agreement,
                     Financing Statement And Fixture Filing,
                             Dated May 1, 2002, From
                  Calpine Corporation, A Delaware Corporation ,
                                   As Trustor
                                       To
                  Chicago Title Insurance Company, As Trustee,
                   And The Bank Of Nova Scotia, As Beneficiary



                           Prior Names of the Trustor
                           --------------------------


Calpine Natural Gas Company L.P.
TGX Corporation
Sheridan Energy, Inc.
Sheridan California Energy, Inc.
Calpine Natural Gas California, Inc.
Calpine Natural Gas Company
Michael Petroleum Corporation


                                      -1-


                 EXHIBIT A To Deed Of Trust With Power Of Sale,
                  Assignment Of Production, Security Agreement,
                     Financing Statement And Fixture Filing,
                             Dated May 1, 2002, From
                  Calpine Corporation, A Delaware Corporation ,
                                   As Trustor
                                       To
                  Chicago Title Insurance Company, As Trustee,
                   And The Bank Of Nova Scotia, As Beneficiary

                               List of Properties
                               ------------------

1.   Depth  limitations,   unit   designations,   unit  tract  descriptions  and
     descriptions  (including  percentages,  decimals or fractions) of undivided
     leasehold interests, well names, "Operating Interests", "Working Interests"
     and "Net Revenue Interests"  contained in this Exhibit A and the listing of
     any percentage,  decimal or fractional interest in this Exhibit A shall not
     be deemed to limit or otherwise  diminish the interests  being subjected to
     the lien, security interest and encumbrance of this instrument.

2.   Some of the land descriptions in this Exhibit A may refer only to a portion
     of the land covered by a particular  lease.  This instrument is not limited
     to the land  described  in  Exhibit A but is  intended  to cover the entire
     interest  of the Trustor in any lease  described  in Exhibit A even if such
     interest  relates to land not described in Exhibit A.  Reference is made to
     the land  descriptions  contained  in the  documents  of title  recorded as
     described  in this Exhibit A. To the extent that the land  descriptions  in
     this Exhibit A are  incomplete,  incorrect or not legally  sufficient,  the
     land  descriptions  contained in the documents so recorded are incorporated
     herein by this reference.

3.   References in Exhibit A to  instruments  on file in the public  records are
     made for all purposes.  Unless provided otherwise, all recording references
     in Exhibit A are to the  official  real  property  records of the county or
     counties in which the  encumbered  property is located and in which records
     such documents are or in the past have been customarily  recorded,  whether
     Deed  Records,  Oil and Gas Records,  Oil and Gas Lease  Records,  Official
     Records or other records.

4.   A statement herein that a certain  interest  described herein is subject to
     the terms of certain  described or referred to  agreements,  instruments or
     other  matters  shall not  operate to  subject  such  interest  to any such
     agreement,  instrument  or other  matter  except  to the  extent  that such
     agreement, instrument or matter is otherwise valid and presently subsisting
     nor shall such  statement  be deemed to  constitute  a  recognition  by the
     parties hereto that any such agreement, instrument or other matter is valid
     and presently subsisting.

                                                       [Do not detach this page]


                                      A-1


                 EXHIBIT B To Deed Of Trust With Power Of Sale,
                  Assignment Of Production, Security Agreement,
                     Financing Statement And Fixture Filing,
                             Dated May 1, 2002, From
                  Calpine Corporation, A Delaware Corporation ,
                                   As Trustor
                                       To
                  Chicago Title Insurance Company, As Trustee,
                   And The Bank Of Nova Scotia, As Beneficiary


                             Permitted Encumbrances
                             ----------------------

          All initially-capitalized terms used in this Exhibit B, whether or not
     defined in this instrument, shall have the meanings given such terms in the
     Credit Agreements.

     (a) Liens securing payment of the Obligations  granted pursuant to any Loan
Document and Liens securing  payment of the obligations  granted pursuant to the
loan documents relating to the Existing Credit Agreement;

     (b)  Liens  granted  prior  to the  Effective  Date to  secure  payment  of
Indebtedness  of the type permitted and described in clause (a) of Section 8.2.2
of the Credit Agreements;

     (c) Liens granted to secure payment of  Indebtedness  of the type permitted
and  described  in clause (b) of Section  8.2.2 of the Credit  Agreements  where
recourse is limited as  described  in clause (b) of Section  8.2.2 of the Credit
Agreements;

     (d) Liens for taxes,  assessments or other  governmental  charges or levies
not at the time  delinquent  or  thereafter  payable  without  penalty  or being
diligently  contested  in good faith by  appropriate  proceedings  and for which
adequate  reserves  in  accordance  with GAAP  shall  have been set aside on its
books;

     (e) Liens of carriers,  warehousemen,  mechanics, materialmen and landlords
incurred  in the  ordinary  course of  business  for sums not  overdue  or being
diligently  contested  in good faith by  appropriate  proceedings  and for which
adequate  reserves  in  accordance  with GAAP  shall  have been set aside on its
books;

     (f) Liens  incurred in the ordinary  course of business in connection  with
workmen's  compensation,  unemployment  insurance or other forms of governmental
insurance  or  benefits,   or  to  secure  performance  of  tenders,   statutory
obligations,  leases and contracts  (other than for borrowed money) entered into
in the ordinary course of business or to secure  obligations on surety or appeal
bonds;

     (g) judgment  Liens in existence  less than 15 days after the entry thereof
or with  respect to which  execution  has been stayed or the payment of which is
covered in full (subject to a customary deductible) by insurance maintained with
responsible insurance companies;


                                      B-1


     (h) Liens granted to secure payment of  Indebtedness  of the type permitted
and described in clauses (e) and (g) of Section  8.2.2 of the Credit  Agreements
where recourse is limited as described in clauses (e) or (g), as applicable,  of
Section 8.2.2 of the Credit Agreements;

     (i) Zoning restrictions, easements, rights of way, title irregularities and
other similar  encumbrances  which alone or in the  aggregate do not  materially
detract from the value of the property subject thereto;

     (j) Liens on the  property or assets of any  Subsidiary  of the Borrower in
favor of the Borrower;

     (k) Banker's Liens and similar Liens (including  set-off rights) in respect
of bank deposits;

     (l) Landlord's Liens and similar Liens in respect of leased property;

     (m) Liens securing  Attributable  Debt with respect to  outstanding  leases
entered into pursuant to Sale/Leaseback Transactions so long as, with respect to
Sale/Leaseback  Transactions  closing after January 1, 2002,  the amount thereof
does not exceed 10% of the consolidated  tangible assets of the Borrower and its
Subsidiaries; and

     (n) Liens incurred in connection with the extension, renewal or refinancing
of Indebtedness secured by Liens permitted and described in clauses (b), (c) and
(h) of Section 8.2.3 of the Credit Agreements;  provided, however, that (x) such
new Lien shall be limited to all or part of the same  property  that secured the
original Lien and (y) the Indebtedness  secured by such Lien at such time is not
increased (other than by an amount necessary to pay fees and expenses, including
premiums,  related  to  the  refinancing,   refunding,   extension,  renewal  or
replacement of such Indebtedness);  provided,  further, that the limitations set
forth in this clause (n) shall not apply to Liens which are otherwise  permitted
under  Section  8.2.3  of the  Credit  Agreements,  even  if such  Liens  secure
Indebtedness  issued to repay or refinance existing  Indebtedness  permitted and
described in clauses (b), (c) and (h) of Section 8.2.3 of the Credit Agreements.


                                      B-2