Agreement between Alaska Pipeline Company and ARCO Alaska, Inc. dated 11/15/91

EX-10.31 17 k02906exv10w31.txt AGREEMENT BETWEEN ALASKA PIPELINE COMPANY AND ARCO ALASKA, INC. DATED 11/15/91 EXHIBIT 10.31 AGREEMENT BETWEEN ALASKA PIPELINE COMPANY AND ARCO ALASKA, INC. TO AMEND AN ASSIGNED INTEREST IN THE GAS PURCHASE CONTRACT BETWEEN SHELL OIL COMPANY AND ALASKA PIPELINE COMPANY DATED DECEMBER 20, 1982 This is an Agreement dated November 15, 1991 to amend an assigned interest in the Gas Purchase Contract dated December 20, 1982, between Shell Oil Company ("Shell") and Alaska Pipeline Company ("Buyer"). That contract is referred to in this Agreement as the Beluga Contract. Effective January 1, 1984, Shell assigned its interest in the Beluga Contract to Shell Western E & P, Inc. ("SWEPI"). Effective March 1, 1990, SWEPI assigned to ARCO Alaska, Inc. ("ARCO") a one-third undivided interest in the Beluga Contract and ARCO assumed a one-third undivided interest in Seller's benefits and obligations under the Beluga Contract. The assignment (referred to as ARCO's Assigned Interest) and cover letter establishing the effective date are attached as Exhibit B. The parties to this Agreement are Alaska Pipeline Company and ARCO. This Agreement amends only ARCO's Assigned Interest. There is a similar, consistent, but not identical agreement with SWEPI which amends SWEPI's retained two-thirds interest in the Beluga Contract and a separate settlement agreement dated November 15, 1991, which resolves litigation pertinent to and affecting this Agreement. 1 The parties wish to amend ARCO's Assigned Interest. Except as expressly modified by this Agreement, the Beluga Contract terms remain in effect and the terms used in this Agreement shall have the same meaning as in the Beluga Contract. In the event that the terms of this Agreement are inconsistent with those in the Beluga Contract, this Agreement shall govern the interpretation of the Beluga Contract as amended by this Agreement. The definition of "swing rate" defined in paragraph 1.16 of the Beluga Contract is deleted and replaced with the following definition: 1.16 The term "swing rate" means Seller's maximum daily obligation to deliver gas expressed in millions of cubic feet. The term "Seller" used in the Beluga Contract is redefined to mean Shell and ARCO. Article V (Quantity) of the Beluga Contract is deleted in its entirety and replaced by a new Article V: ARTICLE V: QUANTITY 5.1 Attached Schedule 1 shall be used to determine the quantity of gas which Buyer shall purchase each year from Seller, subject to the other terms of this Agreement. Schedule 1 states the Annual Contract Quantity ("ACQ") by year as a function of Total Market-Out Volume (as defined below). In any year in which the Total Market-Out Volume is zero, the ACQ shall be determined from the zero line of Schedule 1. For example, if the Total Market Out 2 Volume is zero in 1997, the ACQ shall be 15 BCF. ARCO shall be responsible for supplying one-third of the ACQ. If the Total Market Out Volume falls between the quantities shown in the Total Market Out Column of Schedules 1 through 3, the ACQ (Schedule 1) and the quantities at each price (Schedules 2 and 3) shall be determined by interpolation (see Exhibit C). 5.2 The ACQ shall be reduced if any person or entity (other than Chugach Electric Association, Inc.) which was a customer of Buyer or Buyer's affiliate, ENSTAR Natural Gas Company ("ENSTAR"), on September 30, 1991, purchases some or all of its gas supply from any source(s) other than Buyer or ENSTAR. The quantity of gas purchased from the source(s) other than Buyer or ENSTAR each year is the Market-Out Volume for that year. The sum of all Market-Out Volumes each year is the Total Market-Out Volume for that year. The reduced ACQ shall be determined from Schedule 1. For example, assume that two businesses which were customers of ENSTAR on September 30, 1991 purchase in 1994 a total of 8 Bcf of gas from sources other than ENSTAR or Buyer. The Total Market-Out Volume is 8 Bcf and the ACQ (from Schedule 1) for 1994 is 8.64 Bcf. ARCO shall be responsible for supplying one-third of the ACQ (2.88 Bcf in this example). 5.3 Attached Schedule 2 shows the quantities of gas which shall be priced in accordance with paragraph 7.2(d)(i). Attached Schedule 3 shows the quantities of gas which will be 3 priced in accordance with paragraph 7.2(d)(ii). The sum of the quantities in Schedules 2 and 3 (for each year and Total Market Out Volume) equals the ACQ shown in Schedule 1 (for the same year and Total Market Out Volume). 5.4 Through 1995, the swing rate shall be 110 (i.e., Seller is obligated to deliver a maximum of 110 million cubic feet per day) unless reduced as provided in paragraph 5.4(b). Beginning January 1, 1996, the swing rate shall be a pro-rata share of Buyer's projected maximum daily demand on all suppliers calculated as follows: (a) No later than October 1st of each year (beginning in 1994), Buyer shall give Seller a projection of Buyer's maximum daily demand on all suppliers and total purchases from all suppliers, including Seller, for each of the next two years. Buyer's forecast will not exceed Buyer's historical daily peaks reasonably adjusted for known or estimated changes, including load growth or decline, and Buyer's estimate of Total Market-Out Volume. Seller shall have the right to review all data on which the forecast is based. The swing rate for the second year of the forecast shall be calculated by: (i) using Buyer's estimate of Total Market Out Volume, to determine the estimated ACQ from Schedule 1; (ii) dividing the estimated ACQ by Buyer's forecast of total purchases from all suppliers; and 4 (iii) multiplying the result of (ii) by Buyer's forecast of maximum daily demand on all suppliers, including Seller. All calculations are based on projected data for the second year of the forecast. The first year of the forecast is informational only and will be updated as the forecast "rolls" forward the following year. Balancing gas (see paragraph 5.8) shall not affect the swing rate for any year. An example of the calculation of swing rate for 1998 follows. Assume that on October 1, of 1996, Buyer makes the following forecasts:

(b) If a person or entity (other than Chugach Electric Association, Inc.) which was a customer of Buyer or ENSTAR on September 30, 1991, purchases gas directly from the Beluga River Unit (See Exhibit A) at any time during the years 1992 through 1995, the swing rate shall remain 110 but shall be applied to Buyer and the customer collectively. Stated another way, Seller shall be required to deliver up to, but not more than, 110 MMcf per day to Buyer and the customer combined. For example, if the customer 5 actually purchases 30 MMcf from the Beluga River Unit on a given day, Seller's swing rate to Buyer on that day shall be 80 MMcf (110 MMcf minus 30 MMcf). After 1995, the swing rate shall be determined as provided in paragraph 5.4(a). (c) ARCO shall be responsible for delivering one-third of the swing rate calculated pursuant to this paragraph 5.4. 5.5 If any lessor (see Exhibit A to the Beluga Contract) elects to take its royalty gas in-kind, Seller shall have the option of reducing both the ACQ and swing rate (while royalty gas is being taken in-kind) by the ratio of the total royalty gas taken in kind to the total production from the Beluga River Unit while royalty gas is taken in kind. 5.6 Buyer shall use its best efforts to keep Seller informed as to any peak demand that may occur during a period other than a normal peak demand period so that Seller can more expediently schedule any well or field work that Seller believes is necessary. 5.7 Subject to the other provisions of this Agreement, Seller must produce and deliver to Buyer and Buyer must receive and pay for the ACQ. Buyer has the right, but not the obligation, to purchase the swing rate from Seller on any day of the year, regardless of whether the ACQ for that year has already been taken. Nothing in this Agreement shall be construed to require Seller to produce and deliver or Buyer to purchase and receive from Seller or to pay Seller for any quantities of gas in excess of that which may 6 be produced under the applicable rules, regulations, and orders of regulatory bodies having jurisdiction. Buyer shall have the option to purchase daily quantities of gas, if any, in excess of the swing rate then in effect which, in Seller's sole judgment, can be produced and delivered efficiently and in accordance with good operating practices and without impairment of Seller's obligations under current or future gas sales contracts. 5.8 Despite Buyer's reasonable efforts, the quantity of gas Buyer is obligated to take (i.e., the ACQ) and the quantity of gas Buyer actually takes will not be equal each year because Buyer will not know its total purchases from all suppliers or the Total Market-Out Volume until shortly after year-end due to forecasting limitations, changes in weather, and other operating factors. Any difference between actual purchases and the ACQ ("balancing gas") shall be balanced in January and February of the following year using the following procedures: (a) If in any year Buyer purchases less than the ACQ (deducting from actual purchases any balancing gas taken during that year to satisfy the ACQ of prior years), the balancing gas shall be purchased the following year in addition to the ACQ for that year. During January and February of the following year, all gas purchased shall be deemed to be balancing gas until Buyer has purchased all the balancing gas it is obligated to purchase. The price for balancing gas shall be the price in effect for the prior year (i.e., the year in which the balancing gas should have been 7 purchased). If all of the balancing gas is not taken during January and February, Buyer shall pay in March (when the bill for February deliveries is paid) for the balancing gas not taken. Buyer may take the balancing gas paid for but not taken at any time through December 31, 2010, or any earlier termination of the Beluga Contract, but the balancing gas shall not reduce the ACQ Buyer is obligated to take each year. The balancing gas taken by Buyer shall not exceed the volumes that Seller can produce and deliver efficiently and in accordance with prudent operating practices and without impairment of Seller's obligations under other gas sales contracts. (b) If in any year Buyer purchases more than the ACQ (deducting from actual purchases any balancing gas taken during that year to satisfy the ACQ of prior years), the balancing gas shall be deducted from the ACQ for the following year. The price for the balancing gas shall be the price in effect during the year following the year in which it was purchased (i.e., the year in which the balancing gas should have been purchased). The base price in paragraph 7.1 is changed from $2.32 per Mcf to $1.971 per Mcf. Paragraph 7.2(a) of Article VII (Price) is deleted and replaced with the following provision: 7.2(a)(i) Effective January 1 of each year (the "Adjustment Date"), the base price ($1.971 per Mcf) shall be adjusted as follows: 8 (A) Each year multiply $1.971 by a fraction, the numerator of which is the daily average price per barrel of Light Sweet Crude Oil Futures ("LSCOF") for October and November deliveries of the year prior to the year for which the adjusted price is being calculated, and the denominator of which is $22.36 per barrel. (B) The average price of LSCOF shall be determined from prices for "CRUDE OIL, Light Sweet" futures contracts traded on the New York Mercantile Exchange or its successor. The daily average price of LSCOF shall be the sum of the "Settle" prices reported in the Wall Street Journal or its successor for (i) October contracts for each day that October contracts are reported as the contracts for the Current Trading Month, plus (ii) November contracts for each day that November contracts are reported as the contracts for the Current Trading Month divided by the total number of days that such "Settle" prices are reported. "Current Trading Month" means the final month in which a contract can be traded. (C) If the information necessary to calculate the daily average price of LSCOF is no longer 9 publicly reported, the parties shall attempt to agree on a successor index. If the parties fail to agree on a successor index by November 1 of any year, the price for the next year and the following years shall be the price calculated pursuant to paragraph 7.2(a)(ii). 7.2(a)(ii) If the price cannot be calculated as provided in paragraph 7.2(a)(i) and/or 7.2(d)(ii), the price effective on the Adjustment Date shall be calculated by multiplying $2.32 by a fraction, the numerator of which is the sum of the simple averages of the high and low values (in cents per gallon) reported each day in September and October of the year preceding the Adjustment Date by Platt's Oilgram for No. 2 fuel oil f.o.b. Seattle, Washington, divided by the number of days reported, and the denominator of which is 96 cents per gallon. A new paragraph 7.2(d) shall be added to Article VII (Price): 7.2(d) The total annual purchases from Seller shall be priced as follows: (i) The portion of the ACQ shown in Schedule 2 shall be priced at the base price (Paragraph 7.1) as adjusted under amended Paragraph 7.2(a)(i). (ii) The portion of the ACQ shown in Schedule 3 shall be priced as follows: 10 (A) Effective on the Adjustment Date each year, the price shall be determined by multiplying $1.55 by a fraction, the numerator of which is the daily average price per barrel of Light Sweet Crude Oil Futures ("LSCOF") for the quarter ending on September 30 of the year prior to the year for which the adjusted price is being calculated, and the denominator of which is $18.00 per barrel. (B) The average price of LSCOF shall be determined from prices for "CRUDE OIL, Light Sweet" futures contracts traded on the New York Mercantile Exchange or its successor. The daily average price of LSCOF shall be the sum of the "Settle" prices reported in the Wall Street Journal or its successor for (i) July contracts for each day that July contracts are reported as the contracts for the Current Trading Month, plus (ii) August contracts for each day that August contracts are reported as the contracts for the Current Trading Month, plus (iii) September contracts for each day that September contracts are reported as the contracts for the Current Trading Month, divided by the total number of days that such "Settle" prices are reported. "Current 11 Trading Month" means the final month in which a contract can be traded. (C) If the information necessary to calculate the daily average price of LSCOF is no longer publicly reported, the parties shall attempt to agree on a successor index. If the parties fail to agree on a successor index by October 1 of any year, the price for the next year and the following years shall be the price calculated pursuant to paragraph 7.2(a)(ii). Article XV (Term) and Article XVIII, Section 18.2 (Government Regulation), are deleted and replaced with the following provision: ARTICLE XV: TERM AND REGULATORY APPROVAL This Agreement cannot be permanently implemented until it has been approved by the Alaska Public Utilities Commission (APUC). This Agreement shall be deemed approved when the APUC issues a final order, which is no longer subject to appeal, finding that approval is in the public interest and that the costs incurred under the Agreement are fully recoverable in the rates of ENSTAR. The parties will ask the APUC to approve the Agreement on an interim basis so that it may be implemented January 1, 1992. 12 If APUC interim approval is not obtained prior to January 1, 1992, the parties shall maintain all records necessary to implement the Agreement effective January 1, 1992 when interim approval is obtained, or, if interim approval is not obtained, when final approval is obtained. If the APUC does not approve this Agreement by January 1, 1993, either party may cancel the Agreement after 30 days written notice to the other party and to the APUC. If the APUC approves this Agreement subject to material changes in the terms and conditions which are unacceptable to either party, either party may petition for reconsideration. The party finding the terms and conditions unacceptable must, within 5 days of being served with the order, notify the other party in writing of the terms and conditions which are unacceptable and state whether it will petition for reconsideration. If a petition for reconsideration is filed and if the unacceptable terms and conditions are not cured, the party finding the terms and conditions unacceptable may cancel the Agreement by giving notice within 30 days following the last day on which the petition for reconsideration could be granted or within 30 days following the APUC's order on reconsideration, whichever is earlier. If a petition for reconsideration is not filed, either party may cancel the Agreement by giving written notice within 30 days of the service of the order containing the unacceptable terms and conditions. This Agreement shall terminate December 31, 2009 (except that Buyer shall have until December 31, 2010 to take any balancing 13 gas previously paid for but not taken), or when Buyer has purchased a total of 220 BCF under the Beluga contract as amended by this Agreement, whichever occurs first. The following provision is added to paragraph 20.5: Any action to enforce or interpret this Agreement, or otherwise arising under this Agreement, shall be litigated in the courts of the State of Alaska in the Third Judicial District at Anchorage. The following paragraph 20.7 is added: 20.7 This Agreement is the product of the joint effort of the parties and shall not be construed against either party as drafter. This Agreement, and the Settlement Agreement dated November 15, 1991, are the entire agreement of the parties concerning the subject matter of the Agreement and all prior agreements, understandings, and representations are superseded by this written Agreement. No amendment to this Agreement is binding until reduced to writing and signed by the parties. A comprehensive example of the calculations required by this Agreement is attached as Exhibit C. Exhibit C shows the rules for rounding. ARCO ALASKA, INC. By: /s/ H. L. Belhartz Date: Nov. 15,91 I certify that on this 15th day of November, 1991, there appeared before me H. L. Belhartz and he swore to me that he was the President of ARCO ALASKA, INC. and that he is authorized to sign the foregoing 14 instrument on its behalf, and that he signed the same freely and voluntarily for the purposes therein mentioned. /s/ Sharon R. Jones NOTARY PUBLIC FOR ALASKA My commission expires: 9/13/93 ALASKA PIPELINE COMPANY BY: /s/ R. F. Barnes I certify that on this 19th day of November, 1991, there appeared before me Richard F. Barnes and he swore to me that he was the President of ALASKA PIPELINE COMPANY and that he is authorized to sign the foregoing instrument on its behalf, and that he signed the same freely and voluntarily for the purposes therein mentioned. /s/ Marion L. Izzo NOTARY PUBLIC FOR ALASKA My commission expires: June 13,1993 15 RECEIVED Executive SHELL OIL COMPANY [SHELL OIL COMPANY LOGO] MAR 06 1990 One Shell Plaza P O Box 2463 HOUSTON. Texas 77252 February 27, 1990 Certified Mail Return Receipt Requested Mr. Richard F. Barnes President Alaska Pipeline Company 3000 Spenard Road P. 0. Box 190288 Anchorage, Alaska ###-###-#### Dear Mr. Barnes: SUBJECT: PARTIAL ASSIGNMENT OF GAS PURCHASE CONTRACT GAS PURCHASE CONTRACT BETWEEN SHELL WESTERN E&P INC. AND ALASKA PIPELINE COMPANY DATED DECEMBER 20, 1982 This letter is written pursuant to a services agreement between Shell Western E&P Inc. (SWEPI) and Shell Oil Company. Please find enclosed one (1) copy of a Partial Assignment of the subject Gas Purchase Contract from SWEPI to Arco Alaska, Inc. (ARCO). This document should suffice as evidence of ARCO's assumption of an undivided one-third (1/3) interest in and to all obligations and interests under the subject contract, as amended. This letter and enclosed copy of the assignment is being sent to fulfill the notice requirements of Article XVI, paragraph 16.1 of the contract. Please accept this notice as binding upon Alaska Pipeline Co. as of March 1, 1990 (although the assignment is dated October 1, 1989). ARCO is hereby notified by copy of this letter of the effective date. EXHIBIT B PAGE 1 2 If you have any questions or problems regarding this transaction, please feel free to contact me at ###-###-#### or Don Canavier at ###-###-####. Yours very truly, /s/ R. Planty - ------------------------------ R. Planty Regional Manager Natural Gas Marketing - West DLC/bdt Enclosure cc: Arco Alaska, Inc. Attn: Mr. Bruce Depriester Manager Marketing P. 0. Box 100360 Anchorage, Alaska ###-###-#### EXHIBIT B PAGE 2 PARTIAL ASSIGNMENT OF GAS PURCHASE CONTRACT This partial assignment is made effective this 1st day of October, 1989, by and between Shell Western E&P Inc., a Delaware corporation (hereinafter referred to as "Assignor"), and ARCO Alaska, Inc., a Delaware corporation (hereinafter referred to as "Assignee"); Recitals WHEREAS, Shell Oil Company entered into a Gas Purchase Contract dated December 20, 1982 to sell gas to Alaska Pipeline Company from the Beluga River Gas Field area, Cook Inlet, Alaska (the "Enstar Contract"); and WHEREAS, Assignor has succeeded to the interest of Shell Oil Company, as Seller under the Enstar contract; and WHEREAS, Enstar Corporation has succeeded to the interest of Alaska Pipeline Company as Buyer under the Enstar Contract; and WHEREAS, Shell Oil Company entered into a Gas Purchase Agreement ("the 1984 Agreement"), with Atlantic Richfield Company dated July 1, 1984; and WHEREAS, Assignee has succeeded to the interest of its parent Atlantic Richfield Company under the 1984 Agreement; and WHEREAS, under the 1984 Agreement, Assignor purchased from Assignee portions of the gas sold by Assignor under the Enstar Contract; and WHEREAS, Assignor and Assignee mutually desire to terminate the 1984 Agreement, and in place of the 1984 Agreement enter into a partial assignment of Assignor's rights, obligations and interests under the Enstar Contract as amended, to Assignee; EXHIBIT B PAGE 3 NOW, THEREFORE, in consideration of Ten Dollars ($10.00) and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, Assignor hereby assigns to Assignee an undivided one-third (1/3) interest in and to Assignor's rights, obligations and interests under the Enstar Contract as amended, a copy of which Contract and all amendments thereto are attached hereto and made a part hereof, and Assignee hereby assumes an undivided one-third (1/3) interest in and to Assignor's rights, obligations and interests under the Enstar Contract as amended. Assignor and Assignee further agree that the 1984 Agreement shall be cancelled as of the effective date of this Assignment; provided, however, that if this Assignment or any part thereof is void or becomes invalid, the 1984 Agreement, as amended, will be reinstated according to its terms as of the date of execution of this Assignment. For the purpose of Article 17 of the Enstar Contract, Assignee's address shall be: ARCO Alaska, Inc. P.O. Box 100360 Anchorage, Alaska ###-###-#### Attn: Manager Marketing SHELL WESTERN E&P INC. ARCO ALASKA, INC. By /s/ L. L. Smith By /s/ H. P. Foster, Jr. ---------------------- ------------------------ H. P. Foster, Jr. Its Attorney-in-Fact Its Senior Vice President PARTIAL ASSIGNMENT OF GAS PURCHASE CONTRACT - Page 2 EXHIBIT B PAGE 4 STATE OF Texas ) ss. Harris County) The foregoing instrument was acknowledged before me this 22 day of September, 1989, by L. L. Smith of SHELL WESTERN E&P INC., a Delaware corporation, on behalf of the corporation. /s/ Carolyn Clements Notary Public in and for Texas My Commission Expires: 12-21-92 STATE OF Alaska) ss. Third Judicial Dist.) The foregoing instrument was acknowledged before me this 8th day of February 1990, by H.P. Foster, Jr. of ARCO ALASKA, INC., a Delaware corporation, on behalf of the corporation. /s/ Marilyn H. Roth Notary Public in and for Alaska My Commission Expires: 8/24/93 PARTIAL ASSIGNMENT OF GAS PURCHASE CONTRACT - Page 3 EXHIBIT B PAGE 5 EXHIBIT C This Exhibit contains examples of the basic calculations necessary to implement the Agreement. The sample year is 1998. The three basic calculations illustrated are (1) swing rate, (2) price and (3) the ACQ. 1. Swing Rate - The calculation of swing rate is illustrated in paragraph 5.4(a). The projections of maximum daily demand on all suppliers (MMcf), total purchases from all suppliers (Bcf) , and Total Market Out Volume (Bcf) will be made to two decimal places. The calculation of swing rate will be made as shown and truncated at three decimal places. The result will be rounded to two decimal places. To illustrate using the projections in paragraph 5.4(a): Swing rate 1988 = (11/33) x 235 = 78.33333... Truncate to 3 decimal places = 78.333 Round to 2 decimal places = 78.33 The projections in paragraph 5.4(a) use an estimated Total Market Out Volume of 8.00 Bcf, a whole number shown in Schedule 1, to determine ACQ. If estimated Total Market Out Volume were not a whole number, the ACQ would be determined by interpolation. Interpolation is illustrated in paragraph 3, ACQ, below. The calculation of ACQ when Total Market Out Volume is not a whole number will be truncated at three decimal places and then rounded to two decimal places. 2. Price - Price calculations will be truncated at 5 decimal places and rounded to four decimal places. Intermediate calculations (e.g., calculation of an average price) will be truncated at five decimal places and carried through the calculation. To illustrate the calculation of the price for Schedule 3 volumes, assume that the sum of the prices for LSCOF each day in the calendar quarter ending September 30, 1997, is $1,266.61 per barrel and that values were reported for 66 days. The average daily price per barrel for LSCOF is: ($1266.61/66) = 19.1910606... Truncated to 5 decimal places = 19.19106 EXHIBIT C PAGE 1 The price, effective January 1, 1998, for Schedule 3 volumes is: $1.55 x (19.19106 / 18) = price for 1998 $1.55 x (1.06617) = price for 1998 Truncated to 5 decimal places = 1.65256 Rounded to 4 decimal places 1.6526 = price 1998 3. ACQ - Shortly after the end of 1998, the Total Market Out Volume for 1998 will be known and the ACQ for 1998 can be calculated. To calculate the ACQ for 1998, first state the Total Market Out Volume in Bcf truncated at three decimal places, then round to two decimal places. For example, if the Total Market Out Volume ("TMOV") for 1998 is 8,669,836,000 cf: Stated in Bcf: 8.669,836,000 Truncated to 3 decimal places: 8.669 Bcf Rounded to 2 decimal places: 8.67 Bcf The ACQ is calculated by interpolation as follows: Step 1 (Calculate difference between actual TMOV and next higher TMOV from Schedule 1): Next higher TMOV from Sch. 1 = 9.00 Bcf Less: TMOV 1998 8.67 Bcf ---- Difference 0.33 Bcf Step 2: [ (Step 1 calculation) x (ACQ 1998 @ TMOV=8 - ACQ 1998 @ TMOV =9). [ACQ 1998 @ TMOV = 9] =ACQ 1998 Step 2 (substituting values from Schedule 1 and the Step 1 calculation: [(.33 Bcf) x (11 - 10.5)] + [10.5] = ACQ 1998 [ .165] + [10.5] = 10.6650 2 EXHIBIT C PAGE 2 Step 3: truncate to 3 decimal places = 10.665 round to 2 decimal places = 10.66 Bcf ACQ 1998 = 10.66 Bcf 4. Rounding - The first step in rounding is to truncate to one decimal place greater than the desired number of decimal places. For example, if four decimal places are desired (as in the price calculation) and the "raw" number is $19.1910606..., the "raw" number is first reduced to five decimal places by dropping all digits after the fifth decimal place. The truncated "raw" number is $19.19106. The second step in rounding requires inspection of the last digit. If the last digit is: To round, drop the last digit and: 6, 7, 8, or 9 add 1 to the next to last digit 0, 1, 2, 3, or 4 do nothing to the next to last digit 5 do nothing to the next to last digit if it is even. If the next to last digit is odd, increase the next to last digit by 1 Examples: (a) 25.62047 rounds to 25.6205 (b) 19.13214 rounds to 19.1321 (c) 12.47620 rounds to 12.4762 (d) 11.31965 rounds to 11.3196 (e) 11.31955 rounds to 11.3196 3 SCHEDULE 1 ANNUAL CONTRACT QUANTITY(BCF)*

* The Annual Contract Quantities shown in this Schedule 1 are the total quantities which Buyer must buy and which SWEPI and ARCO must deliver. ARCO shall supply one-third of the ACQ as provided in Paragraph 5.1 of this Agreement. SCHEDULE 2 QUANTITIES OF GAS (BCF) PRICED UNDER PARAGRAPH 7.2 (d)(i)*

Note: For the years 2001 through 2009, all quantities are zero. The zeros are omitted from the table for clarity. * The quantities shown in this Schedule 2 are the total quantities priced under paragraph 7.2(d)(i). ARCO shall supply one-third of the quantities shown. SCHEDULE 3 QUANTITIES OF GAS (BCF) PRICED UNDER PARAGRAPH 7.2 (d)(ii)*

* The quantities shown in this Schedule 3 are the total quantities priced under paragraph 7.2 (d) (ii). ARCO shall supply one-third of the quantities shown.