10-Q 1 body.txt RIO VISTA ENERGY PARTNERS 10-Q 6-30-2005 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2005 OR [_] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to ---------- --------------- Commission file number: 000-50394 RIO VISTA ENERGY PARTNERS L.P. (Exact Name of Registrant as Specified in Its Charter) DELAWARE 20-0153267 (State or Other Jurisdiction of (I.R.S. Employer Identification No.) Incorporation or Organization) 820 GESSNER ROAD, SUITE 1285, HOUSTON, TEXAS 77024 (Address of Principal Executive Offices) (Zip Code) Registrant's Telephone Number, Including Area Code: (713) 467-8235 Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes X No --- --- Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange Act). Yes No X --- --- The number of common units outstanding on August 12, 2004 was 1,910,656. 1

RIO VISTA ENERGY PARTNERS L.P. AND SUBSIDIARIES TABLE OF CONTENTS ITEM PAGE NO. ---- -------- Part I 1. Financial Statements Independent Certified Public Accountants' Review Report 3 Consolidated Balance Sheets as of December 31, 2004 and June 30, 2005 (unaudited) 4-5 Unaudited Consolidated Statements of Operations for the three months and six months ended June 30, 2004 and 2005 6 Unaudited Consolidated Statement of Partners' Capital for the six months ended June 30, 2005 7 Unaudited Consolidated Statements of Cash Flows for the six months ended June 30, 2004 and 2005 8 Notes to Consolidated Financial Statements (unaudited) 9-24 2. Management's Discussion and Analysis of Financial Condition and Results of Operations 25-45 3. Quantitative and Qualitative Disclosures About Market Risk 46 4. Controls and Procedures 46 Part II 1. Legal Proceedings 47 2. Unregistered Sales of Equity Securities and Use of Proceeds 47 3. Defaults Upon Senior Securities 47 4. Submission of Matters to a Vote of Security Holders 47 5. Other Information 47 6. Exhibits 47-48 Signatures 49

2 PART I ITEM 1. Independent Certified Public Accountants' Review Report ------------------------------------------------------- To the Board of Managers of Rio Vista GP LLC, General Partner of Rio Vista Energy Partners L.P. We have reviewed the consolidated balance sheet of Rio Vista Energy Partners L.P. and subsidiaries (Rio Vista) as of June 30, 2005, the consolidated statements of operations for the three months and six months ended June 30, 2004 and 2005, the consolidated statement of partners' capital for the six months ended June 30, 2005, and the consolidated statements of cash flows for the six months ended June 30, 2004 and 2005. These consolidated financial statements are the responsibility of Rio Vista's management. We conducted our review in accordance with the standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board, the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion. Based on our review, we are not aware of any material modifications that should be made to the consolidated financial statements referred to above for it to be in conformity with United States generally accepted accounting principles. We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Rio Vista Energy Partners L.P. and subsidiaries as of December 31, 2004 and the related consolidated statements of operations, partners' capital and cash flows for the year ended December 31, 2004 (not presented herein); and in our report dated February 2, 2005, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying consolidated balance sheet as of December 31, 2004, is fairly stated. Our auditors' report on Rio Vista's financial statements as of December 31, 2004 included an explanatory paragraph referring to the matters discussed in Note N of those financial statements which raised substantial doubt about Rio Vista's ability to continue as a going concern. As indicated in Note K to the accompanying unaudited interim consolidated financial statements, conditions continue to exist which raise substantial doubt about Rio Vista's ability to continue as a going concern. /s/ BURTON McCUMBER & CORTEZ, L.L.P. Brownsville, Texas August 3, 2005 3

RIO VISTA ENERGY PARTNERS L.P. AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS ASSETS June 30, December 31, 2005 2004 (Unaudited) ------------- ------------ Current Assets Cash $ 13,000 $ 17,000 Restricted cash 3,983,000 946,000 Trade accounts receivable (less allowance for doubtful accounts of $0 at 2004 and 2005) 5,785,000 1,746,000 Inventories 198,000 202,000 Prepaid expenses and other current assets 9,000 265,000 ------------- ------------ Total current assets 9,988,000 3,176,000 Property, plant and equipment - net 14,244,000 13,744,000 Other non-current assets 12,000 8,000 ------------- ------------ Total assets $ 24,244,000 $ 16,928,000 ============= ============

The accompanying notes and accountants' report are an integral part of these statements. 4

RIO VISTA ENERGY PARTNERS L.P. AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS LIABILITIES AND PARTNERS' CAPITAL June 30, December 31, 2005 2004 (Unaudited) ------------- ------------ Current Liabilities Due to Penn Octane Corporation, net $ 8,632,000 $ 2,151,000 Accounts payable 290,000 463,000 Mexican taxes payable 27,000 25,000 Accrued liabilities 382,000 484,000 ------------- ------------ Total current liabilities 9,331,000 3,123,000 Commitments and contingencies - - Partners' Capital Common units 14,615,000 13,529,000 General partner's equity 298,000 276,000 ------------- ------------ Total partners' capital 14,913,000 13,805,000 ------------- ------------ Total liabilities and partners' capital $ 24,244,000 $ 16,928,000 ============= ============

The accompanying notes and accountants' report are an integral part of these statements. 5

RIO VISTA ENERGY PARTNERS L.P. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) Three Months Ended Six Months Ended ----------------------- ----------------------- June 30, June 30, June 30, June 30, 2004 2005 2004 2005 --------- ------------ --------- ------------ Revenues $ - $18,309,000 $ - $46,866,000 Cost of goods sold - 17,770,000 - 45,008,000 --------- ------------ --------- ------------ Gross profit - 539,000 - 1,858,000 Selling, general and administrative expenses Legal and professional fees - 401,000 - 643,000 Salaries and payroll related expenses - 356,000 - 750,000 Other - 330,000 - 721,000 --------- ------------ --------- ------------ - 1,087,000 - 2,114,000 --------- ------------ --------- ------------ Operating loss - (548,000) - (256,000) Other income (expense) Interest and LPG financing expense - (155,000) - (273,000) --------- ------------ --------- ------------ Loss before taxes - (703,000) - (529,000) Provision (benefit) for Mexican income taxes - 25,000 - 26,000 --------- ------------ --------- ------------ Net loss $ - $ (728,000) $ - $ (555,000) ========= ============ ========= ============ Net loss allocable to the partners $ - $ (728,000) $ - $ (555,000) Less general partner's interest in net loss - 15,000 - 11,000 --------- ------------ --------- ------------ Net loss allocable to the common units $ - $ (713,000) $ - $ (544,000) ========= ============ ========= ============ Net loss per common unit $ - $ (0.37) $ - $ (0.28) ========= ============ ========= ============ Net loss per common unit assuming dilution $ - $ (0.37) $ - $ (0.28) ========= ============ ========= ============ Weighted average common units outstanding - 1,910,656 - 1,910,656 ========= ============ ========= ============

The accompanying notes and accountants' report are an integral part of these statements. 6

RIO VISTA ENERGY PARTNERS L.P. AND SUBSIDIARIES CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL COMMON UNITS ---------------------- TOTAL GENERAL PARTNERS' UNITS AMOUNT PARTNER CAPITAL --------- ------------ --------- ------------ BALANCE AS OF DECEMBER 31, 2004 1,910,656 $14,615,000 $298,000 $14,913,000 Net loss - (544,000) (11,000) (555,000) Cash distribution to partners - (955,000) (20,000) (975,000) Loan discount on Penn Octane Corporation's debt related to detachable warrants - 413,000 9,000 422,000 --------- ------------ --------- ------------ BALANCE AS OF JUNE 30, 2005 (UNAUDITED) 1,910,656 $13,529,000 $276,000 $13,805,000 ========= ============ ========= ============

The accompanying notes and accountants' report are an integral part of these statements. 7

RIO VISTA ENERGY PARTNERS L.P. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) Six Months Ended ----------------------- June 30, June 30, 2004 2005 --------- ------------ Cash flows from operating activities: Net loss $ - $ (555,000) Adjustments to reconcile net income to net cash provided by (used in) operating activities: Depreciation - 409,000 Amortization of loan discount related to detachable warrants - 173,000 Gain on sale of assets - ( 24,000) Changes in current assets and liabilities: Trade accounts receivable - 4,039,000 Inventories - (4,000) Prepaid expenses and other current assets - (6,000) Trade accounts payable - - Due to Penn Octane Corporation, net - (6,481,000) Accounts payable and accrued liabilities - 275,000 Mexican taxes payable - (3,000) --------- ------------ Net cash provided by (used in) operating activities - (2,177,000) Cash flows from investing activities: Capital expenditures - (60,000) Proceeds from the sale of land - 175,000 Other non-current assets - 4,000 --------- ------------ Net cash used in investing activities - 119,000 Cash flows from financing activities: Increase in restricted cash - 3,037,000 Initial capitalization - - Cash distributions to partners - (975,000) --------- ------------ Net cash provided by (used) in financing activities - 2,062,000 --------- ------------ Net increase in cash - 4,000 Cash at beginning of period 2,000 13,000 --------- ------------ Cash at end of period $ 2,000 $ 17,000 ========= ============ Supplemental disclosures of cash flow information: Cash paid during the year for: Interest and LPG financing expense $ - $ - ========= ============ Supplemental disclosures of noncash transactions: Units and warrants issued and other $ - $ 422,000 ========= ============

The accompanying notes and accountants' report are an integral part of these statements. 8 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE A - ORGANIZATION Rio Vista Energy Partners L.P. (Rio Vista), a Delaware limited partnership, was formed by Penn Octane Corporation (Penn Octane) on July 10, 2003 and was a wholly owned subsidiary of Penn Octane until September 30, 2004, the date that Penn Octane completed a series of transactions involving (i) the transfer of substantially all of its owned pipeline and terminal assets in Brownsville, Texas and Matamoros, Mexico and certain immaterial liabilities (Assets) to Rio Vista Operating Partnership L.P. (RVOP) (ii) the transfer of its 99.9% interest in RVOP to Rio Vista and (iii) the distribution of all of its limited partnership interests (Common Units) in Rio Vista to its common stockholders (Spin-Off), resulting in Rio Vista becoming a separate public company. The Common Units represented 98% of Rio Vista's outstanding capital and 100% of Rio Vista's limited partnership interests. The remaining 2%, which is the general partner interest, is owned and controlled by Rio Vista GP LLC (General Partner), a wholly owned subsidiary of Penn Octane. The General Partner is responsible for the management of Rio Vista. Rio Vista Energy Partners L.P. and its consolidated subsidiaries are collectively hereinafter referred to as "Rio Vista". As a result of the Spin-Off, Rio Vista is engaged in the purchase, transportation and sale of liquefied petroleum gas (LPG). Rio Vista owns and operates LPG terminal facilities in Brownsville, Texas (Brownsville Terminal Facility) and in Matamoros, Tamaulipas, Mexico (Matamoros Terminal Facility) and approximately 23 miles of pipelines (US - Mexico Pipelines) which connect the Brownsville Terminal Facility to the Matamoros Terminal Facility. The primary market for Rio Vista's LPG is the northeastern region of Mexico, which includes the states of Coahuila, Nuevo Leon and Tamaulipas. Rio Vista's primary customer for LPG is P.M.I. Trading Limited (PMI). PMI is a subsidiary of Petroleos Mexicanos, the state-owned Mexican oil company, which is commonly known by its trade name "PEMEX." PMI is the exclusive importer of LPG into Mexico. PMI sells the LPG purchased from Rio Vista to PEMEX which distributes the LPG into the northeastern region of Mexico. All of Rio Vista's LPG operations are conducted through, and Rio Vista's LPG operating assets are owned by, RVOP. The General Partner is entitled to receive distributions on its general partner interest as provided for in Rio Vista's partnership agreement (Agreement). The General Partner has sole responsibility for conducting Rio Vista's business and for managing Rio Vista's operations in accordance with the Agreement. Other than the foregoing distributions, the General Partner does not receive a management fee or other compensation in connection with its management of Rio Vista's business, but is entitled to be reimbursed for all direct and indirect expenses incurred on Rio Vista's behalf. Rio Vista purchases LPG from Penn Octane under a long-term supply agreement (LPG Supply Agreement). The purchase price of the LPG from Penn Octane is determined based on the cost of LPG under Penn Octane's agreements with its LPG suppliers for volumes sold to Rio Vista for sale to PMI or to other Rio Vista customers, other direct costs related to PMI and other LPG sales of Rio Vista and a formula that takes into consideration operating costs of Penn Octane and Rio Vista. Historically, up until the date of the Spin-Off, Penn Octane has sold LPG primarily to PMI. Penn Octane has a long-term lease agreement, expiring in December 2013, for approximately 132 miles of pipeline which connects ExxonMobil Corporation's (Exxon) King Ranch Gas Plant in Kleberg County, Texas and Duke Energy's La Gloria Gas Plant in Jim Wells County, Texas, to Rio Vista's Brownsville Terminal Facility (Leased Pipeline). In addition at the discretion of Exxon, Penn Octane has access to a twelve-inch pipeline which connects Exxon's Viola valve station in Nueces County, Texas to the inlet of the King Ranch Gas Plant (ECCPL) as well as existing and other potential propane pipeline suppliers which have the ability to access the ECCPL. In connection with Penn Octane's lease agreement for the Leased Pipeline, Penn Octane has access to storage in Markham, Texas (Markham Storage) which has a capacity of up to approximately 21,000,000 gallons of storage, as well as other potential propane pipeline suppliers, via approximately 155 miles of pipeline located between Markham, Texas and the Exxon King Ranch Gas Plant. Penn Octane's long term supply agreement in effect as of June 30, 2005 with Exxon requires Penn Octane to purchase minimum quantities of LPG totaling up to 13,900,000 gallons of LPG per month although actual quantities supplied under such agreement during the six months ended June 30, 2005 were approximately 9,100,000 gallons per month. 9 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE A - ORGANIZATION - CONTINUED BASIS OF PRESENTATION ----------------------- The accompanying consolidated financial statements include Rio Vista and its United States subsidiaries including RVOP, Rio Vista Operating GP LLC and Penn Octane International, L.L.C., and its Mexican subsidiaries, Penn Octane de Mexico, S. de R.L. de C.V. (PennMex) and Termatsal, S. de R.L. de C.V. (Termatsal) and its consolidated affiliate, Tergas, S. de R.L. de C.V. (Tergas). All significant intercompany accounts and transactions are eliminated. The unaudited consolidated balance sheet as of June 30, 2005, the unaudited consolidated statements of operations for the three and six months ended June 30, 2004 and 2005 and the unaudited consolidated statement of cash flows for the six months ended June 30, 2004 and 2005, have been prepared by Rio Vista without audit. In the opinion of management, the unaudited consolidated financial statements include all adjustments (which include only normal recurring adjustments) necessary to present fairly the unaudited consolidated financial position of Rio Vista as of June 30, 2005, the unaudited consolidated results of operations for the three months and six months ended June 30, 2004 and 2005 and the unaudited consolidated statement of cash flows for the six months ended June 30, 2004 and 2005. Rio Vista was inactive until September 30, 2004, the date of the Spin-Off and operations did not commence until October 1, 2004. Accordingly, there are no results of operations during the three months and six months ended June 30, 2004. Certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been omitted. These unaudited consolidated financial statements should be read in conjunction with the Rio Vista's Annual Report on Form 10-K for the year ended December 31, 2004 filed with the Securities and Exchange Commission. NOTE B - UNIT BASED COMPENSATION Under the guidance provided by SFAS 123, Rio Vista has elected to continue to account for employee unit-based compensation using the intrinsic value method prescribed in Accounting Principles Board (APB) 25, "Accounting for Stock Issued to Employees", and related Interpretations. 10 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE B - UNIT BASED COMPENSATION - CONTINUED Had compensation cost related to the warrants granted to employees been determined based on the fair value at the grant dates, consistent with the provisions of SFAS 123, Rio Vista's pro forma net income (loss), and net income (loss) per common unit would have been as follows for the three months and six months ended June 30,:

Three Months Ended Six Months Ended ----------------- ----------------- 2004 2005 2004 2005 ----- ---------- ----- ---------- Net income (loss) as reported $ - $(728,000) $ - $(555,000) Add: Unit-based employee compensation expense included in reported net loss - - - - Less: Total unit-based employee compensation expense determined under fair value based method for all awards - (12,000) - (297,000) ----- ---------- ----- ---------- Net income (loss) pro forma - (740,000) - (852,000) Net income (loss) allocable to the common units pro forma - (725,000) - (835,000) Net income (loss) per common unit, as reported - (0.37) - (0.28) Net income (loss) per common unit, pro forma - (0.38) - (0.44) Net income (loss) per common unit assuming dilution, as reported - (0.37) - (0.28) Net income (loss) per common unit assuming dilution, pro forma - (0.38) - (0.44)

The following assumptions were used for grants of warrants to employees in the six months ended June 30, 2005, to compute the fair value of the warrants using the Black-Scholes option-pricing model; dividend yield of 7.7%; expected volatility of 48.4%; risk free interest rate of 3.05%; and expected life of 3 years. During December 2004, the Financial Accounting Standards Board (FASB) issued Statement of Financial Accounting Standard No. 123 (revised 2004) "Share-Based Payment" (SFAS 123R). SFAS 123R replaces SFAS 123, "Accounting for Stock-Based Compensation", and supercedes APB Opinion 25, "Accounting for Stock Issued to Employees" (APB 25). SFAS 123R requires that the cost of share-based payment transactions (including those with employees and non-employees) be recognized in the financial statements as compensation cost. That cost will be measured based on the fair value of equity or liability instrument issued. SFAS 123R is effective for Rio Vista beginning January 1, 2006. Rio Vista will apply the modified prospective method as provided for in SFAS 123R, and therefore the financial statements of Rio Vista for interim and annual periods prior to the adoption of SFAS 123R will not reflect any restatements. 11 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE C - INCOME (LOSS) PER COMMON UNIT Income (loss) per common unit is computed on the weighted average number of units outstanding. During periods in which Rio Vista incurs losses, giving effect to common unit equivalents is not presented as it would be antidilutive. The following tables present reconciliations from income (loss) per common unit to income (loss) per common unit assuming dilution (see note G for the warrants):

For the three months ended June 30, 2005 ----------------------------------------- Income (Loss) Shares Per-Unit (Numerator) (Denominator) Amount -------------- ------------- ---------- Net income (loss) allocable to the common units $ (713,000) BASIC EPS Net income (loss) allocable to the common units (713,000) 1,910,656 $ (0.37) ========== EFFECT OF DILUTIVE SECURITIES Warrants - - DILUTED EPS Net income (loss) allocable to the common units N/A N/A N/A

For the six months ended June 30, 2005 ----------------------------------------- Income (Loss) Shares Per-Unit (Numerator) (Denominator) Amount -------------- ------------- ---------- Net income (loss) allocable to the common units $ (544,000) BASIC EPS Net income (loss) allocable to the common units (544,000) 1,910,656 $ (0.28) ========== EFFECT OF DILUTIVE SECURITIES Warrants - - DILUTED EPS Net income (loss) allocable to the common units N/A N/A N/A

12 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE D - PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consists of the following:

December 31, June 30, 2004 2005 -------------- ------------ Brownsville Terminal Facility Building $ 173,000 $ 173,000 Terminal facilities 3,631,000 3,631,000 Tank Farm 374,000 374,000 Leasehold improvements 319,000 319,000 Equipment 226,000 226,000 Truck 26,000 26,000 -------------- ------------ 4,749,000 4,749,000 -------------- ------------ US - Mexico Pipelines and Matamoros Terminal Facility: (a) U.S. Pipelines and Rights of Way 6,775,000 6,835,000 Mexico Pipelines and Rights of Way 993,000 993,000 Matamoros Terminal Facility 5,876,000 5,876,000 Land 856,000 705,000 -------------- ------------ 14,500,000 14,409,000 -------------- ------------ Total 19,249,000 19,158,000 -------------- ------------ Less: accumulated depreciation and amortization (5,005,000) (5,414,000) -------------- ------------ $ 14,244,000 $13,744,000 ============== ============

(a) Rio Vista owns, leases, or is in the process of obtaining the land or rights of way used related to the US-Mexico Pipelines. 13 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE D - PROPERTY, PLANT AND EQUIPMENT - CONTINUED Property, plant and equipment, net of accumulated depreciation, includes $5,745,000 and $5,542,000 of costs, located in Mexico at December 31, 2004 and June 30, 2005, respectively. NOTE E - INVENTORIES Inventories are valued at the lower of FIFO cost or market (LCM) and consist of the following:

December 31, 2004 June 30, 2005 ----------------- ----------------- Gallons LCM Gallons LCM ------- -------- ------- -------- LPG: Brownsville Terminal Facility and Matamoros Terminal Facility 239,000 $198,000 239,000 $202,000 ======= ======== ======= ========

NOTE F - INCOME TAXES Rio Vista is taxed as a Partnership under Code Section 701 of the Internal Revenue Code. All of Rio Vista's income is taxed at the partner level, therefore, Rio Vista has no U.S. income tax expense or liability. Rio Vista's Mexican subsidiaries incur income tax expense in Mexico on their taxable income. Mexican income tax expense for the three months and six months ended June 30, 2005 was $25,000 and $26,000, respectively. No deferred Mexican income tax expense was recorded for the six months ended June 30, 2005. NOTE G - PARTNERS' CAPITAL COMMON UNITS ------------- In connection with the Spin-Off on September 30, 2004, Rio Vista issued 1,910,656 common units to the holders of Penn Octane common stock. The common units represent limited partner interests in Rio Vista. The holders of common units are entitled to participate in Rio Vista's distributions and exercise the rights or privileges available to limited partners under the Agreement. The holders of common units have only limited voting rights on matters affecting Rio Vista. Holders of common units have no right to elect the General Partner or its managers on an annual or other continuing basis. Penn Octane elects the managers of the General Partner. Although the General Partner has a fiduciary duty to manage Rio Vista in a manner beneficial to Rio Vista and its unitholders, the managers of the General Partner also have a fiduciary duty to manage the General Partner in a manner beneficial to Penn Octane and its stockholders. The General Partner generally may not be removed except upon the vote of the holders of at least 80% of the outstanding common units; provided, however, if at any time any person or group, other than the General Partner and its affiliates, or a direct or subsequently approved transferee of the General Partner or its affiliates, acquires, in the aggregate, beneficial ownership of 20% or more of any class of units then outstanding, that person or group will lose voting rights on all of its units and the units may not be voted on any matter and will not be considered to be outstanding when sending notices of a meeting of unitholders, calculating required votes, determining the presence of a quorum or for other similar purposes. 14 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE G - PARTNERS' CAPITAL - CONTINUED In addition, the partnership agreement contains provisions limiting the ability of holders of common units to call meetings or to acquire information about Rio Vista's operations, as well as other provisions limiting the holders of common units ability to influence the manner or direction of management. GENERAL PARTNER INTEREST ------------------------ The General Partner of Rio Vista owns a 2% general partner interest in Rio Vista. The General Partner is currently 100% owned by Penn Octane. Penn Octane has granted options to Jerome B. Richter, former Chief Executive Officer of Penn Octane, and to Shore Capital LLC (Shore Capital), an affiliate of Richard Shore, Jr., former President of Penn Octane and former Chief Executive Officer of the General Partner, to purchase 50% of its general partner interest. The options expire on July 10, 2006. Following the exercise of any of these options, Penn Octane will retain voting control of the General Partner pursuant to a voting agreement. The General Partner generally has unlimited liability for the obligations of Rio Vista, such as its debts and environmental liabilities, except for those contractual obligations of Rio Vista that are expressly made without recourse to the General Partner. OPTIONS AND WARRANTS -------------------- Rio Vista has no U.S. employees and is managed by its General Partner. Rio Vista applies APB 25 for warrants granted to employees and managers of the General Partner and SFAS 123 for warrants issued to acquire goods and services from non-employees. COMMON UNIT WARRANTS In connection with an employment agreement with Mr. Shore, Shore Capital received warrants to acquire 97,415 common units of Rio Vista with an exercise price of $8.47 per common unit. The warrants are exercisable beginning on October 1, 2004 and expire on July 10, 2006. LOAN DISCOUNT ON PENN OCTANE CORPORATION'S DEBT RELATED TO DETACHABLE WARRANTS During January 2004, in connection with $1,805,000 of debt obligations of Penn Octane, Penn Octane agreed to issue, in the future, an aggregate of 110,250 warrants to purchase Rio Vista common units (Rio Vista Warrants). The exercise price of the warrants was to be determined based on the amount of the first quarterly distribution paid by Rio Vista. As a result of the approval of the payment of Rio Vista's first cash distribution on January 14, 2005 (see below), Rio Vista granted the immediately exercisable warrants having an exercise price of $5.00 and recorded a discount of approximately $422,000 which is reflected as interest expense ratably amortized from the grant date of January 14, 2005 to December 15, 2005, the maturity date of the debt obligations. For the three months and six months ended June 30, 2005 amortization expense was $115,000 and $173,000, respectively. The Rio Vista Warrants will expire on December 15, 2006. 15 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE G - PARTNERS' CAPITAL - CONTINUED EQUITY INCENTIVE PLAN On March 9, 2005, the board of managers of the General Partner approved the Rio Vista 2005 Equity Incentive Plan (2005 Plan). The 2005 Plan permits the grant of common unit options, common unit appreciation rights, restricted common unit and phantom common units to any person who is an employee (including to any executive officer) or consultant of Rio Vista or the General Partner or any affiliate of Rio Vista or the General Partner. The 2005 Plan provides that each outside manager of the General Partner shall be granted a common unit option once each fiscal year for not more than 5,000 common units, in an equal amount as determined by the board of managers. The aggregate number of common units authorized for issuance as awards under the 2005 Plan is 750,000. The 2005 Plan shall remain available for the grant of awards until March 9, 2015, or such earlier date as the board of managers may determine. The 2005 Plan is administered by the compensation committee of the board of managers. Under the terms of the Agreement and applicable rules of the Nasdaq Stock Market, no approval by the common unitholders of Rio Vista was required. On March 9, 2005, the board of managers of the General Partner approved the grant of options to purchase a total of 108,750 common units under the 2005 Plan. Of the total number of options granted, 93,750 were granted to executive officers of the General Partner and Mr. Richter and 15,000 were issued to outside managers of the General Partner. The exercise price for the options is $12.51 per common unit, which is the average of the high and low sales prices for Rio Vista common units as reported by the Nasdaq Stock Market on March 9, 2005. The options granted to executive officers (including Mr. Richter) were fully vested on the date of grant. The options granted to outside managers vest in equal monthly installments over a period of 12 months from the date of grant. All options become fully exercisable upon a change in control event and expire three years from the date of grant. DISTRIBUTIONS OF AVAILABLE CASH ------------------------------- All unitholders have the right to receive distributions from Rio Vista of "available cash" as defined in the partnership agreement in an amount equal to the minimum distribution of $0.25 per quarter per unit, plus any arrearages in the payment of the minimum quarterly distribution on the units from prior quarters. The General Partner receives a distribution corresponding to its 2% General Partnership Interest. The distributions are to be paid 45 days after the end of each calendar quarter. However, Rio Vista is prohibited from making any distributions to unitholders if it would cause an event of default, or an event of default is existing, under any obligation of Penn Octane which Rio Vista has guaranteed (see note H). Cash distributions from Rio Vista are shared by the holders of the common units and the General Partner interest as described in the partnership agreement based on a formula whereby the General Partner receives disproportionately more distributions per percentage interest than the holders of the common units as annual cash distributions exceed certain milestones. On both February 14, 2005 and May 13, 2005, Rio Vista made a cash distribution of $487,000. Rio Vista has not declared a distribution for the quarter ended June 30, 2005. 16 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE H - COMMITMENTS AND CONTINGENCIES CREDIT FACILITY, LETTERS OF CREDIT AND OTHER Rio Vista's LPG purchases are financed entirely by Penn Octane through its credit facility with RZB Finance, LLC (RZB). As of June 30, 2005, Penn Octane had a $20,000,000 credit facility with RZB for demand loans and standby letters of credit (RZB Credit Facility) to finance Penn Octane's purchases of LPG and gasoline and diesel fuel (Fuel Products) in connection with Penn Octane's fuel sales business. The RZB Credit facility is an uncommitted facility under which the letters of credit have an expiration date of no more than 90 days and the facility is reviewed annually at March 31. As a result of the financing provided to Rio Vista by Penn Octane, Rio Vista has agreed to guarantee Penn Octane's obligations with respect to the RZB Credit Facility. In connection with Rio Vista's guaranty, Rio Vista granted RZB a security interest and assignment in any and all of Rio Vista's accounts, inventory, real property, buildings, pipelines, fixtures and interests therein or relating thereto, including, without limitation, the lease with the Brownsville Navigation District of Cameron County for the land on which Rio Vista's Brownsville Terminal Facility is located, and has entered into leasehold deeds of trust, security agreements, financing statements and assignments of rent. Under the RZB Credit Facility, Rio Vista may not permit to exist any subsequent lien, security interest, mortgage, charge or other encumbrance of any nature on any of its properties or assets, except in favor of RZB, without the consent of RZB. In connection with the LPG Supply Agreement, Penn Octane and Rio Vista have agreed to share the financing costs related to Penn Octane's purchase of LPG under the RZB Credit Facility. Under the RZB Credit Facility, Penn Octane is required to pay a fee with respect to each letter of credit thereunder in an amount equal to the greater of (i) $500, (ii) 2.5% of the maximum face amount of such letter of credit for LPG and Fuel Products (effective July 21, 2005, the Fuel Products rate was reduced to 2%), or (iii) such higher amount as may be agreed to between Penn Octane and RZB. Any loan amounts outstanding under the RZB Credit Facility accrue interest at a rate equal to the rate announced by the JPMorgan Chase Bank as its prime rate (6.25% at June 30, 2005) plus 2.5%. Pursuant to the RZB Credit Facility, RZB has sole and absolute discretion to limit or terminate its participation in the RZB Credit Facility at any time, and to refrain from making any loans or issuing any letters of credit thereunder. RZB also has the right to demand payment of any and all amounts outstanding under the RZB Credit Facility at any time. Mr. Richter had personally guaranteed all of Penn Octane's and Rio Vista's payment obligations with respect to the RZB Credit Facility. On July 21, 2005 in connection with the annual March 31, 2005 renewal of the RZB Credit Facility, RZB no longer required Mr. Richter's personal guarantee. Under the terms of the RZB Credit Facility, either Penn Octane or Rio Vista is required to maintain net worth of a minimum of $10,000,000. Under the terms of the RZB Credit Facility, all cash from Rio Vista's LPG sales is deposited directly into a restricted cash account under the direction of RZB to pay down all obligations of Penn Octane arising under the RZB Credit Facility. Accordingly, Rio Vista only receives net proceeds from the restricted cash account when the amounts of collateral provided by Penn Octane and Rio Vista exceed all liabilities under outstanding letters of credit issued on behalf of Penn Octane, at the sole discretion of RZB. Historically RZB has not unduly withheld net proceeds from Penn Octane, and Rio Vista does not expect that RZB will unduly withhold net proceeds from Rio Vista. Upon the release of Rio Vista's net proceeds from Rio Vista's restricted cash account, Rio Vista is then required to pay any remaining amounts due Penn Octane, if any, for the supply of LPG and other allocated or direct expenses. 17 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE H - COMMITMENTS AND CONTINGENCIES - CONTINUED CONCENTRATIONS OF CREDIT RISK Financial instruments that potentially subject Rio Vista to credit risk include cash balances at banks which at times exceed the federal deposit insurance. TAX OBLIGATIONS OF PENN OCTANE RESULTING FROM THE SPIN-OFF Rio Vista has agreed to indemnify Penn Octane for a period of three years from December 31, 2004 for any federal income tax liabilities resulting from the Spin-Off in excess of $2,500,000. Penn Octane does not believe that it has a federal income tax in connection with the Spin-Off in excess of $2,500,000. However, the Internal Revenue Service (IRS) may review Penn Octane's federal income tax returns and challenge positions that it may take with respect to the Spin-Off. PARTNERSHIP TAX TREATMENT Rio Vista is not a taxable entity for U.S. tax purposes (see below) and incurs no U.S. federal income tax liability. Rio Vista's Mexican subsidiaries are taxed on their income directly by the Mexican government. The income/loss of Rio Vista's Mexican subsidiaries are included in the U.S. partnership income tax return of Rio Vista. The holders of the common units and General Partner interest will be entitled to their proportionate share of any tax credits resulting from any income taxes paid to the Mexican government. Each unitholder of Rio Vista is required to take into account that unitholder's share of items of income, gain, loss and deduction of Rio Vista in computing that unitholder's federal income tax liability, even if no cash distributions are made to the unitholder by Rio Vista. Distributions by Rio Vista to a unitholder are generally not taxable unless the amount of cash distributed is in excess of the unitholder's adjusted tax basis in Rio Vista. Section 7704 of the Internal Revenue Code (Code) provides that publicly traded partnerships, as a general rule, are taxed as corporations despite the fact that they are not classified as corporations under Section 7701 of the Code. Section 7704 of the Code provides an exception to this general rule for a publicly traded partnership if 90% or more of its gross income for every taxable year consists of "qualifying income" (Qualifying Income Exception). For purposes of this exception, "qualifying income" includes income and gains derived from the exploration, development, mining or production, processing, refining, transportation (including pipelines) or marketing of any mineral or natural resource. Other types of "qualifying income" include interest (other than from a financial business or interest based on profits of the borrower), dividends, real property rents, gains from the sale of real property, including real property held by one considered to be a "dealer" in such property, and gains from the sale or other disposition of capital assets held for the production of income that otherwise constitutes "qualifying income". No ruling has been or will be sought from the IRS and the IRS has made no determination as to Rio Vista's classification as a partnership for federal income tax purposes or whether Rio Vista's operations generate a minimum of 90% of "qualifying income" under Section 7704 of the Code. If Rio Vista was classified as a corporation in any taxable year, either as a result of a failure to meet the Qualifying Income Exception or otherwise, Rio Vista's items of income, gain, loss and deduction would be reflected only on Rio Vista's tax return rather than being passed through to Rio Vista's unitholders, and Rio Vista's net income would be taxed at corporate rates. 18 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE H - COMMITMENTS AND CONTINGENCIES - CONTINUED PARTNERSHIP TAX TREATMENT - CONTINUED If Rio Vista was treated as a corporation for federal income tax purposes, Rio Vista would pay tax on income at corporate rates, which is currently a maximum of 35%. Distributions to unitholders would generally be taxed again as corporate distributions, and no income, gains, losses, or deductions would flow through to the unitholders. Because a tax would be imposed upon Rio Vista as a corporation, the cash available for distribution to unitholders would be substantially reduced and Rio Vista's ability to make minimum quarterly distributions would be impaired. Consequently, treatment of Rio Vista as a corporation would result in a material reduction in the anticipated cash flow and after-tax return to unitholders and therefore would likely result in a substantial reduction in the value of Rio Vista's common units. Current law may change so as to cause Rio Vista to be taxable as a corporation for federal income tax purposes or otherwise subject Rio Vista to entity-level taxation. The Agreement provides that, if a law is enacted or existing law is modified or interpreted in a manner that subject Rio Vista to taxation as a corporation or otherwise subjects Rio Vista to entity-level taxation for federal, state or local income tax purposes, then the minimum quarterly distribution amount and the target distribution amount will be adjusted downward to reflect the impact of that law on Rio Vista. OTHER Rio Vista and its subsidiaries are involved with other proceedings, lawsuits and claims. Rio Vista believes that the liabilities, if any, ultimately resulting from such proceedings, lawsuits and claims should not materially affect its consolidated financial statements. Pursuant to the Omnibus Agreement, Penn Octane has agreed to indemnify Rio Vista for claims related to the Assets arising from events or conditions occurring or existing before completion of the Spin-Off. LONG-TERM DEBT Long-term debt of Penn Octane guaranteed by Rio Vista and on which certain of its assets are pledged totaled $1,805,000 at June 30, 2005. This debt is due on December 15, 2005. Interest is payable quarterly at a rate of 16.5% per annum. The payments due June 15, 2005 in the amounts of approximately $103,000 have not been made on these notes. GUARANTEES AND ASSETS PLEDGED ON CERTAIN OF PENN OCTANE'S OBLIGATIONS The dollar amounts of Penn Octane's obligations which Rio Vista guarantees and/or for which Rio Vista's assets are pledged total $10.9 million at June 30, 2005 based on Penn Octane's most recently filed Quarterly Report on Form 10-Q and the unaudited amounts were as follows: LPG and fuel products trade accounts payable $4,200,000 Total debt, net of discount $1,700,000 Lines of credit $3,900,000 Letters of credit in excess of LPG and fuel products trade accounts payable $1,100,000 Consolidated current assets of Penn Octane, which includes assets of Rio Vista, pledged in favor of Penn Octane's credit facility and certain other debt total $26,600,000 at June 30, 2005 and the unaudited amounts were as follows: Accounts receivable $ 6,500,000 Restricted cash $ 2,700,000 Inventory $ 2,000,000 Property, plant and equipment, net $15,400,000 19 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE H - COMMITMENTS AND CONTINGENCIES - CONTINUED GUARANTEES AND ASSETS PLEDGED ON CERTAIN OF PENN OCTANE'S OBLIGATIONS - CONTINUED Rio Vista's assets that are included in the above amounts are as follows: Accounts receivable $ 1,700,000 Restricted cash $ 900,000 Inventory $ 200,000 Property, plant and equipment, net $13,700,000 NOTE I - CONTRACTS LPG SALES TO PMI During December 2004, Rio Vista and PMI entered into a three month agreement for the period January 1, 2005 to March 31, 2005 for the minimum sale of 11,700,000 gallons of LPG for the months of January and February 2005 and 11,050,000 gallons of LPG for the month of March 2005 (Quarterly Agreement) at reduced margins compared with those in effect during 2004. Actual volumes sold were 12,700,000 gallons, 9,900,000 gallons and 9,600,000 gallons for January, February and March 2005, respectively. In April 2005, Rio Vista entered into a one month contract with PMI for the sale of a minimum of 10,450,000 gallons at a further reduction in margin. One May 5, 2005, Rio Vista entered into a contract with PMI for the sale of a minimum of 6,000,000 gallons of LPG for the period May 5, 2005 to May 31, 2005 at the reduced margin received in April 2005. For the period May 1, 2005 to May 4, 2005, PMI did not purchase any LPG from Rio Vista. Actual volumes of LPG sold to PMI for April and May 2005 were 10,800,000 gallons and 6,100,000 gallons, respectively. The shortfall for the month of February 2005 was attributable to Penn Octane not having a sufficient supply of LPG to meet the minimum contract volume. The shortfall for the month of March 2005 was attributable to PMI not purchasing the minimum contract volume. In accordance with the Quarterly Agreement, PMI paid approximately $104,000 representing the total amount due associated with the shortfall volumes for March 2005. 20 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE I - CONTRACTS - CONTINUED LPG SALES TO PMI - CONTINUED Effective June 4, 2005, Rio Vista entered into an agreement with PMI for the period June 4, 2005 through March 31, 2006 for the purchase of LPG (PMI Agreement). PMI did not purchase LPG from Rio Vista during the period June 1 - June 3, 2005. The following table sets forth the minimum monthly volume of LPG that PMI has committed to purchase from Rio Vista pursuant to the PMI Agreement.

Month Minimum Volumes -------------- --------------- (gallons) June 2005 3,500,000 July 2005 3,500,000 August 2005 3,500,000 September 2005 5,700,000 October 2005 8,100,000 November 2005 11,700,000 December 2005 11,700,000 January 2006 11,700,000 February 2006 11,700,000 March 2006 8,100,000

Actual volumes of LPG sold to PMI for June and July 2005 were 3,500,000 gallons and 3,500,000 gallons, respectively. Under the terms of the PMI Agreement, the sale price of LPG will be at the same margins in effect during April and May 2005. PMI has primarily used the Matamoros Terminal Facility to load LPG purchased from Penn Octane prior to the Spin-Off and from Rio Vista, subsequent thereto, for distribution by truck in Mexico. Rio Vista will continue to use the Brownsville Terminal Facility in connection with LPG delivered by railcar to other customers, storage and as an alternative terminal in the event the Matamoros Terminal Facility cannot be used. 21 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE J - RELATED PARTY TRANSACTIONS The General Partner has a legal duty to manage Rio Vista in a manner beneficial to Rio Vista's unitholders. This legal duty originates in statutes and judicial decisions and is commonly referred to as a "fiduciary" duty. Because the General Partner is currently owned by Penn Octane, Penn Octane's officers and managers of the General Partner also have fiduciary duties to manage the business of the General Partner in a manner beneficial to Penn Octane and its stockholders. The partnership agreement limits the liability and reduces the fiduciary duties of the General Partner to the unitholders. The partnership agreement also restricts the remedies available to unitholders for actions that might otherwise constitute breaches of the General Partner's fiduciary duty. Under the terms of the LPG Supply Agreement and Omnibus Agreement, Penn Octane charged Rio Vista $17,761,000 and $45,041,000 for the three months and six months ended June 30, 2005. INTERCOMPANY PURCHASE AGREEMENT FOR LPG Penn Octane entered into the LPG Supply Agreement with Rio Vista pursuant to which Rio Vista has agreed to purchase all of its LPG requirements for sales which utilize the assets transferred to Rio Vista by Penn Octane to the extent Penn Octane is able to supply such LPG requirements. The LPG Supply Agreement further provides that Rio Vista has no obligation to purchase LPG from Penn Octane to the extent the distribution of such LPG to Rio Vista's customers would not require the use of any of the assets Penn Octane contributed to Rio Vista or Penn Octane ceases to have the right to access the Leased Pipeline. Under the LPG Supply Agreement, Penn Octane supplies all of Rio Vista's LPG requirements in connection with its LPG sales obligations to PMI. The purchases of the LPG are at fluctuating prices and are determined based on the cost of LPG under Penn Octane's agreements with its LPG suppliers for volumes sold to Rio Vista for sale to PMI or to other Rio Vista customers, other direct costs related to PMI and other LPG sales of Rio Vista and a formula that takes into consideration operating costs of Penn Octane and Rio Vista. Rio Vista expects the aggregate costs per gallon to purchase LPG (less any applicable adjustments) to be below the aggregate sales prices per gallon of LPG sold to PMI. Under the terms of Penn Octane's Exxon Supply Contract, Penn Octane must provide letters of credit in amounts equal to the cost of the product to be purchased. In addition, the cost of the product purchased is tied directly to overall market conditions. As a result, Penn Octane's existing letter of credit facility may not be adequate to meet the letter of credit requirements under the Exxon Supply Contract or other suppliers if there are increases in quantities of LPG purchased and/or to finance future price increases of LPG. The LPG Supply Agreement terminates on the earlier to occur of: - Penn Octane ceases to have the right to access the Leased Pipeline that connects to Rio Vista's Brownsville Terminal Facility; and - Rio Vista ceases to sell LPG using any of the assets contributed by Penn Octane to Rio Vista pursuant to the Spin-Off. 22 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE J - RELATED PARTY TRANSACTIONS - CONTINUED OMNIBUS AGREEMENT In connection with the Spin-Off, Penn Octane entered into an Omnibus Agreement with Rio Vista that governs, among other things, indemnification obligations among the parties to the agreement, related party transactions, the provision of general administration and support services by Penn Octane. The Omnibus Agreement prohibits Rio Vista from entering into any material agreement with Penn Octane without the prior approval of the conflicts committee of the board of managers of the General Partner. For purposes of the Omnibus Agreement, the term material agreements means any agreement between Rio Vista and Penn Octane that requires aggregate annual payments in excess of $100,000. The Omnibus Agreement may be amended by written agreement of the parties; provided, however that it may not be amended without the approval of the conflicts committee of the General Partner if such amendment would adversely affect the unitholders of Rio Vista. The Omnibus Agreement has an initial term of five years that automatically renews for successive five-year terms and, other than the indemnification provisions, will terminate if Rio Vista is no longer an affiliate of Penn Octane. NOTE K - REALIZATION OF ASSETS The accompanying consolidated balance sheet has been prepared in conformity with accounting principles generally accepted in the United States of America, which contemplate continuation of Rio Vista as a going concern. Rio Vista is dependent on Penn Octane's ability to deliver adequate quantities of LPG at an acceptable price for ultimate sale to PMI, to provide credit to Rio Vista for such purchases and to provide management of its operations. Currently, Rio Vista's only source of revenue is from sales of LPG to PMI and it operates under a short-term sale agreement with PMI which provides for monthly volumes which are materially less than Penn Octane's historical monthly volumes and margins. As a result, Penn Octane's and Rio Vista's gross profit have been materially reduced and may continue to decline and their cash flow and available credit may be insufficient to absorb such additional reductions in gross profit. Rio Vista has guaranteed certain of Penn Octane's obligations. Substantially all of Rio Vista's and Penn Octane's assets are pledged or committed to be pledged as collateral on $1,805,000 of Penn Octane's existing debt and the RZB Credit Facility, and therefore, both Rio Vista and Penn Octane may be unable to obtain additional financing collateralized by those assets. Penn Octane's Report of Independent Certified Public Accountants on the consolidated financial statements of Penn Octane at July 31, 2004 contains an explanatory paragraph which describes an uncertainty about Penn Octane's ability to continue as a going concern. If Penn Octane's and Rio Vista's cash flows are not adequate to pay their obligations, Penn Octane and/or Rio Vista may be required to raise additional funds to avoid foreclosure by Penn Octane's creditors. There can be no assurance that such additional funding will be available on terms attractive to either Penn Octane or Rio Vista or available at all. If additional amounts cannot be raised and cash flow is inadequate, Penn Octane and/or Rio Vista would likely be required to seek other alternatives which could include the sale of assets, closure of operations and/or protection under the U.S. bankruptcy laws. 23 RIO VISTA ENERGY PARTNERS L.P. AND SUBIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) NOTE K - REALIZATION OF ASSETS - CONTINUED In view of the matters described in the preceding paragraphs, recoverability of the recorded asset amounts shown in the accompanying unaudited consolidated balance sheet is dependent upon the ability of Penn Octane to continue as a going concern and continued sales of LPG to PMI at acceptable volumes and margins to provide sufficient cash flow to pay Rio Vista's expenses and guarantees of Penn Octane's obligations assuming Penn Octane's inability to pay such obligations. The unaudited consolidated balance sheet does not include any adjustments related to the recoverability and classification of recorded asset amounts or amounts and classification of liabilities that might be necessary should Rio Vista be unable to continue in existence. To provide Rio Vista with the ability it believes necessary to continue in existence, management is taking steps to (i) diversify Rio Vista's operations to reduce dependency on sales of LPG and (ii) sell its LPG assets. NOTE L - SUBSEQUENT EVENT PURCHASE AND SALE AGREEMENT On August 15, 2005, Penn Octane and Rio Vista each entered into separate purchase and sale agreements (PSA's) with TransMontaigne Product Services Inc. (TransMontaigne) which provide for the sale and assignment of all of their respective LPG assets and refined products assets including the Brownsville LPG and refined products terminal facility and tank farm and associated leases, owned pipelines located in the United States, including land, leases, and rights of ways, LPG inventory, 100% of the outstanding stock of Mexican subsidiaries and affiliate, which in turn own pipelines and the Matamoros Terminal Facility, including land and rights of way, and assignment of the Pipeline Lease, PMI sales agreement and Exxon Supply Contract (LPG Asset Sale). The purchase price is $10,100,000 for assets to be sold by Penn Octane and $17,400,000 for assets to be sold by Rio Vista. The purchase price may be reduced as provided for in the PSA's. In connection with the PSA's, TransMontaigne agreed to loan Rio Vista $1,300,000 which is to be repaid, including interest, as a reduction of the total purchase price at the time of closing or 120 days following demand by TransMontaigne. The loan is to be secured by the tank farm and certain LPG storage tanks located at the Brownsville Terminal Facility and is subject to the consent from RZB and the issuance of an estoppel letter from the Brownsville Navigation District. Rio Vista intends to use the proceeds from the loan to fund certain expenses associated with the PSA's and for working capital purposes. The closing of the LPG Asset Sale is subject to several conditions, including TransMontaigne's satisfactory completion of its due diligence review, including financial , business, environmental and legal, the approval of Penn Octane's stockholders and Rio Vista's unit holders, assignment of LPG related contracts, and the modification of LPG related permits and the related Mexican governmental approvals. The PSA's may be terminated by any party if the closing does not occur by October 31, 2005. If the LPG Asset Sale is completed, Penn Octane intends to use a portion of its proceeds to pay off the Restructured Notes and $280,000 Notes plus accrued interest. In addition, Penn Octane estimates that it may have a federal tax liability in connection with the sale of its assets. The remaining proceeds will be available to Penn Octane to fund working capital requirements and to pursue activities which will enhance stockholder value. Penn Octane intends to continue to operate its Fuel Sales Business. Penn Octane intends to file a proxy statement with the Securities Exchange Commission (SEC) in connection with the requirement to obtain approval for the LPG Asset Sale from Penn Octane's stockholders. If the LPG Asset Sale is completed, Rio Vista intends to use its proceeds to fund working capital requirements, pursue acquisitions and to resume the minimum quarterly distributions to its unitholders and to pay all arrearages. Rio Vista intends to pursue acquisitions which produce "qualifying income". Rio Vista intends to file a proxy statement with the SEC in connection with the requirement to obtain approval for the LPG Asset Sale from Rio Vista's unitholders. Rio Vista's proxy statement will also contain a proposal to amend the provision in its partnership agreement which requires dissolution upon a sale of all or substantially all of its assets. 24 ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS The following discussion of Rio Vista's liquidity and capital resources should be read in conjunction with the unaudited consolidated financial statements of Rio Vista and related notes thereto appearing elsewhere herein. References to specific years preceded by "fiscal" (e.g. fiscal 2005) refer to Rio Vista's fiscal year ending December 31. FORWARD-LOOKING STATEMENTS The statements contained in this Quarterly Report that are not historical facts are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. These forward-looking statements may be identified by the use of forward-looking terms such as "believes," "expects," "may," "will", "should" or "anticipates" or by discussions of strategy that inherently involve risks and uncertainties. From time to time, Rio Vista has made or may make forward-looking statements, orally or in writing. These forward-looking statements include statements regarding anticipated future revenues, sales, LPG supply, LPG pricing, operations, demand, potential acquisitions, competition, capital expenditures, future acquisitions, additional financing, the deregulation of the LPG market in Mexico, the operations of the US - Mexico Pipelines, the Brownsville and Matamoros Terminal Facilities, other upgrades to Rio Vista's facilities, foreign ownership of LPG operations, short-term obligations and credit arrangements, guarantees, cash distributions, Qualifying Income, Penn Octane, the Spin-Off and other statements regarding matters that are not historical facts, and involve predictions which are based upon a number of future conditions that ultimately may prove to be inaccurate. Actual results, performance or achievements could differ materially from the results expressed in, or implied by, these forward-looking statements. Factors that may cause or contribute to such differences include those discussed in Rio Vista's Form 10 filed with the Securities and Exchange Commission, those discussed under "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations," in Rio Vista's Annual Report on Form 10-K for the year ended December 31, 2004, Rio Vista's Registration Statement on Form 10 as well as those discussed elsewhere in this Quarterly Report. These factors may not include all material risks facing Rio Vista. RIO VISTA ENERGY PARTNERS L.P. AND ITS CONSOLIDATED SUBSIDIARIES ARE COLLECTIVELY HEREINAFTER REFERRED TO AS "RIO VISTA". PURCHASE AND SALE AGREEMENTS. On August 15, 2005, Penn Octane and Rio Vista each entered into separate purchase and sale agreements (the "PSA's") with TransMontaigne Product Services Inc. ("TransMontaigne") which provide for the sale and assignment of all of their respective LPG assets and refined products assets including the Brownsville LPG and refined products terminal facility and tank farm and associated leases, owned pipelines located in the United States, including land, leases, and rights of ways, LPG inventory, 100% of the outstanding stock of Mexican subsidiaries and affiliate, which in turn own pipelines and the Matamoros Terminal Facility, including land and rights of way, and assignment of the Pipeline Lease, PMI sales agreement and Exxon Supply Contract (the "LPG Asset Sale"). The purchase price is $10.1 million for assets to be sold by Penn Octane and $17.4 million for assets to be sold by Rio Vista. The purchase price may be reduced as provided for in the PSA's. In connection with the PSA's, TransMontaigne agreed to loan Rio Vista $1.3 million which is to be repaid, including interest, as a reduction of the total purchase price at the time of closing or 120 days following demand by TransMontaigne. The loan is to be secured by the tank farm and certain LPG storage tanks located at the Brownsville Terminal Facility and is subject to the consent from RZB and the issuance of an estoppel letter from the Brownsville Navigation District. Rio Vista intends to use the proceeds from the loan to fund certain expenses associated with the PSA's and for working capital purposes. The closing of the LPG Asset Sale is subject to several conditions, including TransMontaigne's satisfactory completion of its due diligence review, including financial , business, environmental and legal, the approval of Penn Octane's stockholders and Rio Vista's unit holders, assignment of LPG related contracts, and the modification of LPG related permits and the related Mexican governmental approvals. The PSA's may be terminated by any party if the closing does not occur by October 31, 2005. 25 If the LPG Asset Sale is completed, Penn Octane intends to use a portion of its proceeds to pay off the Restructured Notes and $280,000 Notes plus accrued interest. In addition, Penn Octane estimates that it may have a federal tax liability in connection with the sale of its assets. The remaining proceeds will be available to Penn Octane to fund working capital requirements and to pursue activities which will enhance stockholder value. Penn Octane intends to continue to operate its Fuel Sales Business. Penn Octane intends to file a proxy statement with the Securities Exchange Commission (the "SEC") in connection with the requirement to obtain approval for the LPG Asset Sale from Penn Octane's stockholders. If the LPG Asset Sale is completed, Rio Vista intends to use its proceeds to fund working capital requirements, pursue acquisitions and to resume the minimum quarterly distributions to its unitholders and to pay all arrearages. Rio Vista intends to pursue acquisitions which produce "qualifying income". Rio Vista intends to file a proxy statement with the SEC in connection with the requirement to obtain approval for the LPG Asset Sale from Rio Vista's unitholders. Rio Vista's proxy statement will also contain a proposal to amend the provision in its partnership agreement which requires dissolution upon a sale of all or substantially all of its assets. The following discusses Rio Vista's existing risk factors, its business, its results of operations and its liquidity and capital resources assuming that the sale of the assets discussed above is not consummated as contemplated. RISK FACTORS Business Factors. Beginning with the expiration of the liquefied petroleum gas ("LPG") sales contract between Penn Octane Corporation ("Penn Octane') and P.M.I. Trading Limited ("PMI") effective March 31, 2004 and continuing through the contract recently entered into between Rio Vista and PMI effective June 4, 2005 (the "PMI Agreement"), Penn Octane and Rio Vista have experienced lower LPG sales volumes and margins since April 1, 2004 between Penn Octane and PMI through the date of the Spin-Off and Rio Vista and PMI after the Spin-off which have adversely affected Rio Vista's results of operations. Rio Vista has only one customer for LPG in Mexico, PMI. There is no assurance that upon expiration of the PMI Agreement that PMI will continue to purchase LPG from Rio Vista or in quantities or at prices that are profitable. There are a limited number of suppliers of LPG that connect to Rio Vista's pipelines and a limited supply of LPG. Rio Vista may lose its competitive advantage when Penn Octane's Seadrift pipeline lease expires in 2013. Rio Vista may be unable to successfully develop additional sources of revenue in order to reduce its dependence on PMI. Rio Vista may not have sufficient cash to meet its obligations. All of Rio Vista's assets are pledged as collateral for existing debt of Penn Octane, and Rio Vista therefore may be unable to obtain additional financing collateralized by such assets. Rio Vista is at risk of economic loss due to fixed margin contracts. If Rio Vista cannot develop sufficient capital resources for acquisitions or opportunities for expansion, Rio Vista's growth will be limited. Future acquisitions and expansions may not be successful, may substantially increase Rio Vista's indebtedness and contingent liabilities, and may create integration difficulties. Rio Vista's business would be adversely affected if operations at its transportation, terminal and distribution facilities were interrupted. Rio Vista's business would also be adversely affected if the operations of Rio Vista's customers and suppliers (including Penn Octane) were interrupted. Competitive Factors. The energy industry is highly competitive. There is competition within the industries and also with other industries in supplying the energy and fuel needs of the industry and individual consumers. Rio Vista competes with other companies including Valero, L.P. ("Valero") in the sale or purchase of LPG as well as the transportation of these products in the U.S. and Mexican markets and employs all methods of competition which are lawful and appropriate for such purposes. A key component of Rio Vista's competitive position, particularly given the commodity-based nature of many of its products, is its ability to manage its expenses successfully, which requires continuous management focus on reducing unit costs and improving efficiency and its ability to secure unique opportunities for the purchase, sale and/or delivery methods of its products. International Factors. Mexican economic, political and social conditions may change and adversely affect Rio Vista's operations. Rio Vista may not be able to continue operations in Mexico if Mexico restricts the existing ownership structure of its Mexican operations, requiring Rio Vista to increase its reliance on Mexican nationals to conduct its business. The LPG market in Mexico has yet to be deregulated. If deregulation ocurrs, the results may hinder Rio Vista's ability to negotiate acceptable contracts with distributors. 26 Political Factors. The operations and earnings of Rio Vista in the U.S. and Mexico have been, and may in the future be, affected from time to time in varying degree by political instability and by other political developments and laws and regulations, such as forced divestiture of assets; restrictions on production, imports and exports; war or other international conflicts; civil unrest and local security concerns that threaten the safe operation of Rio Vista's facilities; price controls; tax increases and retroactive tax claims; expropriation of property; cancellation of contract rights; and environmental regulations. Both the likelihood of such occurrences and their overall effect upon Rio Vista vary greatly and are not predictable. Industry and Economic Factors. The operations and earnings of Rio Vista throughout the U.S. and Mexico are affected by local, regional and global events or conditions that affect supply and demand for Rio Vista's products. These events or conditions are generally not predictable and include, among other things, general economic growth rates and the occurrence of economic recessions; the development of new supply sources for its products; supply disruptions; weather, including seasonal patterns that affect energy demand and severe weather events that can disrupt operations; technological advances, including advances in exploration, production, refining and advances in technology relating to energy usage; changes in demographics, including population growth rates and consumer preferences; and the competitiveness of alternative hydrocarbon or other energy sources or product substitutes. Acquisition Factors. In additional to the factors cited above, the advancement, cost and results of particular acquisitions sought by Rio Vista, including acquisitions which do not specifically fall within the areas of Rio Vista's current lines of businesses will depend on: the outcome of negotiations for such acquisitions; the ability of the Rio Vista's management to manage such acquisitions; the ability of Rio Vista to obtain financing for such acquisitions; business integration issues; changes in operating conditions or costs; and the occurrence of unforeseen technical difficulties. Market Risk Factors. See "Notes to Consolidated Financial Statements," "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Quantitative and Qualitative Disclosures About Market Risk" in this report for discussion of the impact of market risks, inflation and other uncertainties. Internal Control Factors. Pursuant to Section 404 of the Sarbanes Oxley Act of 2002, beginning with the year ended December 31, 2006, Rio Vista's management will be required to complete an annual evaluation of its internal control systems. In addition, Rio Vista's independent auditors are required to provide an opinion regarding such evaluation and the adequacy of Rio Vista's internal accounting controls. Rio Vista's internal controls may be found to be inadequate, deficiencies or weaknesses may be discovered, and remediation may not be successful. As Rio Vista grows, Rio Vista will need to strengthen its internal control systems. If Rio Vista acquires an existing business, the internal control systems of the acquired business may be inadequate and may require additional strengthening. Projections. Projections, estimates and descriptions of Rio Vista's plans and objectives included herein are forward-looking statements. Actual future results could differ materially due to, among other things, the factors discussed above and elsewhere in this report. OVERVIEW Rio Vista Energy Partners L.P. ("Rio Vista"), a Delaware limited partnership, was formed by Penn Octane Corporation ("Penn Octane") on July 10, 2003 and was a wholly owned subsidiary of Penn Octane until September 30, 2004, the date that Penn Octane completed a series of transactions involving (i) the transfer of substantially all of its owned pipeline and terminal assets in Brownsville, Texas and Matamoros, Mexico and certain immaterial liabilities (the "Assets") to Rio Vista Operating Partnership L.P. ("RVOP") (ii) the transfer of its 99.9% interest in RVOP to Rio Vista and (iii) the distribution of all of its limited partnership interests (the "Common Units") in Rio Vista to its common stockholders (the "Spin-Off"), resulting in Rio Vista becoming a separate public company. The Common Units represented 98% of Rio Vista's outstanding capital and 100% of Rio Vista's limited partnership interests. The remaining 2%, which is the general partner interest, is owned and controlled by Rio Vista GP LLC (the "General Partner"), a wholly owned subsidiary of Penn Octane. The General Partner is responsible for the management of Rio Vista. Rio Vista Energy Partners L.P. and its consolidated subsidiaries are collectively hereinafter referred to as "Rio Vista". 27 As a result of the Spin-Off, Rio Vista is engaged in the purchase, transportation and sale of liquefied petroleum gas ("LPG"). Rio Vista owns and operates terminal facilities in Brownsville, Texas (the "Brownsville Terminal Facility") and in Matamoros, Tamaulipas, Mexico (the "Matamoros Terminal Facility") and approximately 23 miles of pipelines (the "US - Mexico Pipelines") which connect the Brownsville Terminal Facility to the Matamoros Terminal Facility. The primary market for Rio Vista's LPG is the northeastern region of Mexico, which includes the states of Coahuila, Nuevo Leon and Tamaulipas. Rio Vista believes it has a competitive advantage in the supply of LPG for the northeastern region of Mexico because of Rio Vista's pipeline and terminal facilities and its long term LPG supply agreement with Penn Octane which allow Rio Vista to bring supplies of LPG close to consumers of LPG in major cities in that region at competitive prices. Rio Vista's primary customer for LPG is P.M.I. Trading Limited ("PMI"). PMI is a subsidiary of Petroleos Mexicanos, the state-owned Mexican oil company, which is commonly known by its trade name "PEMEX." PMI is the exclusive importer of LPG into Mexico. PMI sells the LPG purchased from Rio Vista to PEMEX which distributes the LPG into the northeastern region of Mexico. All of Rio Vista's LPG operations are conducted through, and Rio Vista's LPG operating assets are owned by, RVOP. The General Partner is entitled to receive distributions on its general partner interest as provided for in Rio Vista's partnership agreement. The General Partner has sole responsibility for conducting Rio Vista's business and for managing Rio Vista's operations in accordance with the partnership agreement. Other than the foregoing distributions, the General Partner does not receive a management fee or other compensation in connection with its management of Rio Vista's business, but is entitled to be reimbursed for all direct and indirect expenses incurred on Rio Vista's behalf. Rio Vista purchases LPG from Penn Octane under a long-term supply agreement (the "LPG Supply Agreement"). The purchase price of the LPG from Penn Octane is determined based on the cost of LPG under Penn Octane's agreements with its LPG suppliers for volumes sold to Rio Vista for sale to PMI or to other Rio Vista customers, other direct costs related to PMI and other LPG sales of Rio Vista and a formula that takes into consideration operating costs of Penn Octane and Rio Vista. Rio Vista provides products and services through a combination of fixed-margin and fixed-price contracts. Costs included in cost of goods sold, other than the purchase price of LPG, may affect actual profits from sales, including costs relating to transportation, storage, leases and maintenance. Historically, up until the date of the Spin-Off, Penn Octane has sold LPG primarily to PMI. Penn Octane has a long-term lease agreement, expiring in December 2013, for approximately 132 miles of pipeline which connects ExxonMobil Corporation's ("Exxon") King Ranch Gas Plant in Kleberg County, Texas and Duke Energy's La Gloria Gas Plant in Jim Wells County, Texas, to Rio Vista's Brownsville Terminal Facility (the "Leased Pipeline"). In addition at the discretion of Exxon, Penn Octane has access to a twelve-inch pipeline which connects Exxon's Viola valve station in Nueces County, Texas to the inlet of the King Ranch Gas Plant (the "ECCPL"), as well as existing and other potential propane pipeline suppliers which have the ability to access the ECCPL. In connection with Penn Octane's lease agreement for the Leased Pipeline, Penn Octane has access to storage in Markham, Texas (the "Markham Storage") which has a capacity of up to approximately 21.0 million gallons of storage, as well as other potential propane pipeline suppliers, via approximately 155 miles of pipeline located between Markham, Texas and the Exxon King Ranch Gas Plant. Penn Octane's long term supply agreement in effect as of June 30, 2005 with Exxon requires Penn Octane to purchase minimum quantities of LPG totaling up to 13.9 million gallons of LPG per month although actual quantities supplied under such agreements during the six months ended June 30, 2005 were approximately 9.1 million gallons per month. 28 LPG SALES The following table shows Rio Vista's actual volumes sold to PMI in gallons and average sales price for the six months ended June 30, 2005 and actual sales to PMI by Penn Octane in gallons and average sales price for the six months ended June 30, 2004. 2004 2005 ------- ------- Volume Sold LPG (millions of gallons) - PMI 97.7 52.7 Average sales price LPG (per gallon) - PMI $ 0.75 $ 0.89 RECENT TRENDS. Since April 2004, PMI had contracted with Penn Octane and Rio Vista (subsequent to the Spin-Off) for volumes which were significantly lower than amounts purchased by PMI from Penn Octane in similar periods during previous years and beginning April 2005 margins have been significantly lower than historical levels. See Liquidity and Capital Resources - Sales to PMI below. Rio Vista believes that the reduction of volume commitments or margins for April 2004 through March 2006 is based on additional LPG production by PEMEX being generated from the Burgos Basin field in Reynosa, Mexico, an area within the proximity of Rio Vista's Matamoros Terminal Facility and increased competition from U.S. suppliers (see below). Although Rio Vista is not aware of the total amount of LPG actually being produced by PEMEX from the Burgos Basin, it is aware that PEMEX has constructed and is operating two new cryogenic facilities at the Burgos Basin which it believes may have a capacity of producing up to 12 million gallons of LPG per month. Rio Vista also believes that PEMEX intends to install two additional cryogenic facilities, with similar capacity, to be operational in 2006. Rio Vista is not aware of the capacity at which the current cryogenic facilities are being operated. Furthermore, Rio Vista is not aware of the actual gas reserves of the Burgos Basin or the gas quality, each of which could significantly impact LPG production amounts. During June 2004, Valero began operation of a newly constructed LPG terminal facility in Nuevo Laredo, Mexico and a newly constructed pipeline connecting the terminal facility in Nuevo Laredo, Mexico to existing pipelines in Juarez, Texas which connect directly to Valero Energy Corporation's Corpus Christi, Texas and Three Rivers, Texas refineries. Valero originally contracted with PMI under a five year agreement to deliver approximately 6.3 million gallons (of which 3.2 million gallons were previously delivered by truck from Three Rivers, Texas) of LPG per month. During July 2005, Valero announced that it had entered into a new agreement with PMI which provides for double the amount of LPG previously contracted for with PMI. During 2004, a pipeline operated by El Paso Energy between Corpus Christi, Texas and Hidalgo County, Texas was closed. Historically these facilities had supplied approximately 5.0 million gallons of LPG per month to Rio Vista's strategic zone. Rio Vista is not aware of any future plans for these facilities. During 2003, PMI constructed and began operations of a refined products cross border pipeline connecting a pipeline running from PEMEX's Cadereyta Refinery in Monterey, Mexico to terminal facilities operated by TransMontaigne in Brownsville, Texas. The pipeline crosses the U.S.-Mexico border near the proximity of Rio Vista's U.S. - Mexico Pipelines. In connection with the construction of the pipeline, PMI utilizes an easement from Rio Vista for an approximate 21.67 acre portion of the pipeline. Under the terms of the easement, PMI has warranted that it will not transport LPG through October 15, 2017. 29 RESULTS OF OPERATIONS THREE MONTHS ENDED JUNE 30, 2005 COMPARED WITH PENN OCTANE'S SALES TO PMI FOR THE THREE MONTHS ENDED JUNE 30, 2004. Revenues. Revenues for the three months ended June 30, 2005, were $18.3 million compared with $30.2 million for the comparative period one year earlier, a decrease of $11.9 million or 39.3%. Of this decrease, $17.9 million was attributable to decreased volumes of LPG sold to PMI during the three months ended June 30, 2005, partially offset by $6.0 million attributable to increases in average sales prices of LPG sold to PMI during the three months ended June 30, 2005. Cost of goods sold. Cost of goods sold for the three months ended June 30, 2005 was $17.8 million. The cost of goods sold for LPG purchased from Penn Octane was determined in accordance with the LPG Supply Agreement. Costs of goods sold also included other direct costs related to Rio Vista's LPG operations, including costs associated with operating the Brownsville and Matamoros terminal facilities. Selling, general and administrative expenses. Selling, general and administrative expenses were $1.1 million for the three months ended June 30, 2005. These costs were comprised of indirect selling general expenses directly incurred by Rio Vista or allocated by Penn Octane to Rio Vista in accordance with the Omnibus Agreement. Salary related costs allocated by Penn Octane were based on the percentage of time spent by those employees (including executive officers) in performing Rio Vista related matters compared with the overall time spent working by those employees. Other income (expense). Other income (expense) was $(155,000) for the three months ended June 30, 2005 and is comprised of interest expense allocated to Rio Vista by Penn Octane in connection with the RZB Credit Facility and amortization of loan discount related to detachable warrants. Mexican Income tax. Rio Vista incurred $25,000 of Mexican income tax expense related to its Mexican subsidiaries. SIX MONTHS ENDED JUNE 30, 2005 COMPARED WITH PENN OCTANE'S SALES TO PMI FOR THE SIX MONTHS ENDED JUNE 30, 2004. Revenues. Revenues for the six months ended June 30, 2005, were $46.9 million compared with $73.6 million for the comparative period one year earlier, a decrease of $26.9 million or 36.5%. Of this decrease, $39.9 million was attributable to decreased volumes of LPG sold to PMI during the six months ended June 30, 2005, partially offset by $13.0 million attributable to increases in average sales prices of LPG sold to PMI during the six months ended June 30, 2005. Cost of goods sold. Cost of goods sold for the six months ended June 30, 2005 was $45.0 million. The cost of goods sold for LPG purchased from Penn Octane was determined in accordance with the LPG Supply Agreement. Costs of goods sold also included other direct costs related to Rio Vista's LPG operations, including costs associated with operating the Brownsville and Matamoros terminal facilities. Selling, general and administrative expenses. Selling, general and administrative expenses were $2.1 million for the six months ended June 30, 2005. These costs were comprised of indirect selling general expenses directly incurred by Rio Vista or allocated by Penn Octane to Rio Vista in accordance with the Omnibus Agreement. Salary related costs allocated by Penn Octane were based on the percentage of time spent by those employees (including executive officers) in performing Rio Vista related matters compared with the overall time spent working by those employees. Other income (expense). Other income (expense) was $(273,000) for the six months ended June 30, 2005 and is comprised of interest expense allocated to Rio Vista by Penn Octane in connection with the RZB Credit Facility and amortization of loan discount related to detachable warrants. Mexican Income tax. Rio Vista incurred $26,000 of Mexican income tax expense related to its Mexican subsidiaries. 30 LIQUIDITY AND CAPITAL RESOURCES General. Rio Vista commenced operations on October 1, 2004 and only had nominal cash at the time of the Spin-Off. Rio Vista pays all of its direct costs and expenses, and Rio Vista reimburses Penn Octane for cost and expenses paid by Penn Octane on behalf of Rio Vista. As discussed below, Rio Vista sells LPG to PMI and purchases the LPG from Penn Octane. Rio Vista's LPG Supply Agreement with Penn Octane provides that it pays Penn Octane for LPG purchased upon receipt of the proceeds from sales to PMI. Under the terms of the PMI Agreement referred to below, the sale price of LPG will be at the same margins in effect during April and May 2005. Because the volume commitments and price margins under the PMI Agreement are significantly lower than PMI's historical volume commitments and margins, Rio Vista's income will be less than its expected cash operating and other expenses during the period from at least June through September 2005. Rio Vista estimates monthly cash flow shortfalls, assuming current expense levels excluding scheduled obligations, during these months on a consolidated basis ranging from approximately $175,000 per month at a volume of 3.5 million gallons to approximately $75,000 per month at a volume of 5.7 million gallons. The cash flow operating shortfalls projected above do not reflect the further cash requirements associated with existing debt and other obligations of Rio Vista. Actual shortfalls could be significantly higher than estimated above. Rio Vista is taking certain measures to further reduce cash operating and other expenses. There can be no assurance, however, that costs and expenses can be reduced sufficiently to mitigate negative cash flows at the reduced volumes and margins contained in the PMI Agreement. Rio Vista's cash flow has been reduced as a result of materially lower volumes of sales to PMI and materially reduced margins. Additionally, Rio Vista has begun to incur the additional public company compliance and income tax preparation costs. As a result of these factors, Rio Vista may not have sufficient cash flow to pay its obligations when due and/or make future distributions to its unitholders. In the event Penn Octane does not pay its obligations when due, Rio Vista's guarantees to Penn Octane and Penn Octane's creditors may be triggered. Accordingly, Rio Vista may be required to pay such obligations of Penn Octane to avoid foreclosure against its assets by Penn Octane's creditors. If Rio Vista's revenues and other sources of liquidity are not adequate to pay its obligations, Rio Vista may be required to reduce or eliminate the quarterly distributions to unitholders and Penn Octane or Rio Vista may be required to raise additional funds to avoid such foreclosure. There can be no assurance that such additional funding will be available on terms attractive to either Penn Octane or Rio Vista or available at all. Although Rio Vista is not required to do so, if Penn Octane is unable to pay its obligations when they become due, Rio Vista may lend the necessary funds to Penn Octane. Conversely, if Rio Vista does not have the funds necessary to pay its obligations and to make its distributions, to the extent that Penn Octane has sufficient cash to do so, it may lend such amounts to Rio Vista. If Penn Octane's cash flow from operations is not adequate to satisfy such payment of liabilities and obligations and/or tax liabilities when due and Rio Vista is unable to satisfy its guarantees and/or tax indemnification agreement, Penn Octane and/or Rio Vista may be required to pursue additional debt and/or equity financing. In such event, Penn Octane's management and the General Partner do not believe that Penn Octane and/or Rio Vista would be able to obtain such financing from traditional commercial lenders. In addition, there can be no assurance that such additional financing will be available on terms attractive to Penn Octane and/or Rio Vista or at all. If additional financing is available through the sale of Penn Octane's and/or Rio Vista's equity and/or other securities convertible into equity securities through public or private financings, substantial and immediate dilution may occur. There is no assurance that Rio Vista would be able to raise any additional capital if needed. If additional financing cannot be accomplished and Rio Vista is unable to pay its liabilities and obligations when due or to restructure certain of Penn Octane's liabilities and obligations, Rio Vista may suffer material adverse consequences to its business, financial condition and results of operations and Penn Octane and/or Rio Vista would likely be required to seek other alternatives which include the sale of assets, closure of operations and/or protection under the U.S. bankruptcy laws. 31 Dependency on Penn Octane. Rio Vista is dependent on Penn Octane's ability to deliver adequate quantities of LPG at an acceptable price for ultimate sale to PMI, to provide credit to Rio Vista for such purchases and to provide management of its operations. In addition, substantially all of Rio Vista's and Penn Octane's assets are pledged or committed to be pledged as collateral on $1.8 million of Penn Octane's existing debt and the RZB Credit Facility and therefore, both Rio Vista and Penn Octane maybe unable to obtain additional financing collateralized by those assets. Guarantees and Assets Pledged on Certain of Penn Octane's Obligations. Rio Vista has agreed to guarantee certain of Penn Octane's obligations to creditors and all of Rio Vista's assets are pledged as collateral for those obligations of Penn Octane to such creditors. In addition, Rio Vista has agreed to indemnify Penn Octane for a period of three years from December 31, 2004 for any federal income tax liabilities resulting from the Spin-Off in excess of $2.5 million. Consequently, Rio Vista may be unable to obtain financing using these pledged assets as collateral and Rio Vista's inability to borrow on these assets may adversely affect Rio Vista's results of operations and ability to make distributions to its unitholders. Rio Vista may also be prohibited from making any distributions to unitholders if it would cause an event of default, or if an event of default is existing, under Penn Octane's revolving credit facilities, or any other covenant which may exist under any other credit arrangement or other regulatory requirement at the time. The following table reflects cash flows for the six months ended June 30, 2004 and 2005. All information is in thousands.

2004 2005 ----------- ----------- Net cash provided by (used in) operating activities $ - $( 2,177) Net cash used in investing activities - 119 Net cash provided by (used in) in financing activities - 2,062 ----------- ----------- Net increase in cash $ - $ 4 =========== ===========

The following is a discussion of the guaranteed obligations: 32 RZB OBLIGATION Rio Vista's LPG purchases are financed entirely by Penn Octane through its credit facility with RZB Finance, LLC ("RZB"). As of June 30, 2005, Penn Octane had a $20.0 million credit facility with RZB for demand loans and standby letters of credit (the "RZB Credit Facility") to finance Penn Octane's purchases of LPG and gasoline and diesel fuel ("Fuel Products") in connection with Penn Octane's fuel sales business. The RZB Credit facility is an uncommitted facility under which the letters of credit have an expiration date of no more than 90 days and the facility is reviewed annually at March 31. As a result of the financing provided to Rio Vista by Penn Octane, Rio Vista has agreed to guarantee Penn Octane's obligations with respect to the RZB Credit Facility. In connection with Rio Vista's guaranty, Rio Vista granted RZB a security interest and assignment in any and all of Rio Vista's accounts, inventory, real property, buildings, pipelines, fixtures and interests therein or relating thereto, including, without limitation, the lease with the Brownsville Navigation District of Cameron County for the land on which Rio Vista's Brownsville Terminal Facility is located, and has entered into leasehold deeds of trust, security agreements, financing statements and assignments of rent. Under the RZB Credit Facility, Rio Vista may not permit to exist any subsequent lien, security interest, mortgage, charge or other encumbrance of any nature on any of its properties or assets, except in favor of RZB, without the consent of RZB. In connection with the LPG Supply Agreement, Penn Octane and Rio Vista have agreed to share the financing costs related to Penn Octane's purchase of LPG under the RZB Credit Facility. Under the RZB Credit Facility, Penn Octane is required to pay a fee with respect to each letter of credit thereunder in an amount equal to the greater of (i) $500, (ii) 2.5% of the maximum face amount of such letter of credit for LPG and Fuel Products (effective July 21, 2005, the Fuel Products rate was reduced to 2%), or (iii) such higher amount as may be agreed to between Penn Octane and RZB. Any loan amounts outstanding under the RZB Credit Facility accrue interest at a rate equal to the rate announced by the JPMorgan Chase Bank as its prime rate (6.25% at June 30, 2005) plus 2.5%. Pursuant to the RZB Credit Facility, RZB has sole and absolute discretion to limit or terminate its participation in the RZB Credit Facility at any time, and to refrain from making any loans or issuing any letters of credit thereunder. RZB also has the right to demand payment of any and all amounts outstanding under the RZB Credit Facility at any time. Jerome B. Richter, former Chief Executive Officer of Penn Octane, had personally guaranteed all of Penn Octane's and Rio Vista's payment obligations with respect to the RZB Credit Facility. On July 21, 2005 in connection with the annual March 31, 2005 renewal of the RZB Credit Facility, RZB no longer required Mr. Richter's personal guarantee. Under the terms of the RZB Credit Facility, either Penn Octane or Rio Vista is required to maintain net worth of a minimum of $10.0 million. Under the terms of the RZB Credit Facility, all cash from Rio Vista's LPG sales is deposited directly into a restricted cash account under the direction of RZB to pay down all obligations of Penn Octane arising under the RZB Credit Facility. Accordingly, Rio Vista only receives net proceeds from the restricted cash account when the amounts of collateral provided by Penn Octane and Rio Vista exceed all liabilities under outstanding letters of credit issued on behalf of Penn Octane, at the sole discretion of RZB. Historically RZB has not unduly withheld net proceeds from Penn Octane, and Rio Vista does not expect that RZB will unduly withhold net proceeds from Rio Vista. Upon the release of Rio Vista's net proceeds from Rio Vista's restricted cash account, Rio Vista is then required to pay any remaining amounts due Penn Octane, if any, for the supply of LPG and other allocated or direct expenses. LPG financing expense allocated to Rio Vista from Penn Octane associated with the RZB Credit Facility totaled $101,000 for the six months ended June 30, 2005. Penn Octane may need to increase its credit facility for increases in quantities of LPG and Fuel Products purchased and/or to finance future price increases of LPG and Fuel Products. Rio Vista relies on Penn Octane's ability to allocate credit limits under the RZB Credit Facility to purchase quantities of LPG. However there can be no assurance that Penn Octane will have available and/or continue to provide sufficient credit limits for Rio Vista's required purchases of LPG. 33 LONG-TERM DEBT Long-term debt of Penn Octane guaranteed by Rio Vista and on which certain of its assets are pledged totaled $1.8 million at June 30, 2005. This debt is due on December 15, 2005. Interest is payable quarterly at a rate of 16.5% per annum. The payments due June 15, 2005 in the amounts of approximately $103,000 have not been made on these notes. OBLIGATIONS AND ASSETS PLEDGED The dollar amounts of Penn Octane obligations which Rio Vista guarantees and/or for which Rio Vista's assets are pledged total $10.9 million at June 30, 2005, based on Penn Octane's most recently filed Quarterly Report on Form 10-Q, and the unaudited amounts were as follows (in millions): LPG and fuel products trade payables $ 4.2 Total debt, net of discount $ 1.7 Lines of credit $ 3.9 Letters of credit in excess of LPG and fuel products trade payables $ 1.1 Consolidated current assets of Penn Octane, which includes assets of Rio Vista, pledged in favor of Penn Octane's credit facility and certain other debt total $26.6 million at June 30, 2005 and the unaudited amounts were as follows (in millions): Accounts receivable $ 6.5 Restricted cash $ 2.7 Inventory $ 2.0 Property, plant and equipment, net $ 15.4 Rio Vista's assets that are included in the above amounts are as follows (in millions): Accounts receivable $ 1.7 Restricted cash $ .9 Inventory $ .2 Property, plant and equipment, net $ 13.7 The following is a summary of Rio Vista's estimated minimum contractual obligations as of June 30, 2005.

PAYMENTS DUE BY PERIOD (AMOUNTS IN MILLIONS) ------------------------------------------------ Less than 1 - 3 4 - 5 After Contractual Obligations Total 1 Year Years Years 5 Years -------------------------------------- ------- ---------- -------- ------- -------- Long-Term Debt Obligations $ - $ - $ - $ - $ - Operating Leases .2 .1 .1 - - LPG Purchase Obligations - - - - - Other Long-Term Obligations - - - - - ------- ---------- -------- ------- -------- Total Contractual Cash Obligations $ .2 $ .1 $ .1 $ - $ - ======= ========== ======== ======= ========

34 The following is a summary of Rio Vista's estimated minimum commercial obligations as of June 30, 2005, based on Penn Octane's most recently filed Quarterly Report on Form 10-Q as of June 30, 2005.

AMOUNT OF COMMITMENT EXPIRATION PER PERIOD (AMOUNTS IN MILLIONS) ---------------------------------------------------- Commercial Total Amounts Less than 1 - 3 4 - 5 Over Commitments Committed 1 Year Years Years 5 Years -------------------------------- -------------- ---------- ------ ------ -------- Lines of Credit $ - $ - $ - $ - $ - Standby Letters of Credit - - - - - Guarantees 10.9 10.9 - - - Standby Repurchase Obligations N/A N/A N/A N/A N/A Other Commercial Commitments N/A N/A N/A N/A N/A -------------- ---------- ------ ------ -------- Total Commercial Commitments $ 10.9 $ 10.9 $ - $ - $ - ============== ========== ====== ====== ========

Income Taxes. Rio Vista has agreed to indemnify Penn Octane for a period of three years from December 31, 2004 for any federal income tax liabilities resulting from the Spin-Off in excess of $2.5 million. Penn Octane does not believe that it has a federal income tax in connection with the Spin-Off in excess of $2.5 million. However, the Internal Revenue Service (the "IRS") may review Penn Octane's federal income tax returns and challenge positions that it may take with respect to the Spin-Off. Partnership Tax Treatment. Rio Vista is not a taxable entity for U.S. tax purposes (see below) and incurs no U.S. federal income tax liability. Rio Vista's Mexican subsidiaries are taxed on their income directly by the Mexican government. The income/loss of Rio Vista's Mexican subsidiaries are included in the U.S. partnership income tax return of Rio Vista. The holders of the common units and General Partner interest will be entitled to their proportionate share of any tax credits resulting from any income taxes paid to the Mexican government. Each unitholder of Rio Vista is required to take into account that unitholder's share of items of income, gain, loss and deduction of Rio Vista in computing that unitholder's federal income tax liability, even if no cash distributions are made to the unitholder by Rio Vista. Distributions by Rio Vista to a unitholder are generally not taxable unless the amount of cash distributed is in excess of the unitholder's adjusted tax basis in Rio Vista. Section 7704 of the Internal Revenue Code (Code) provides that publicly traded partnerships, as a general rule, are taxed as corporations despite the fact that they are not classified as corporations under Section 7701 of the Code. Section 7704 of the Code provides an exception to this general rule for a publicly traded partnership if 90% or more of its gross income for every taxable year consists of "qualifying income" (the "Qualifying Income Exception"). For purposes of this exception, "qualifying income" includes income and gains derived from the exploration, development, mining or production, processing, refining, transportation (including pipelines) or marketing of any mineral or natural resource. Other types of "qualifying income" include interest (other than from a financial business or interest based on profits of the borrower), dividends, real property rents, gains from the sale of real property, including real property held by one considered to be a "dealer" in such property, and gains from the sale or other disposition of capital assets held for the production of income that otherwise constitutes "qualifying income". No ruling has been or will be sought from the IRS and the IRS has made no determination as to Rio Vista's classification as a partnership for federal income tax purposes or whether Rio Vista's operations generate a minimum of 90% of "qualifying income" under Section 7704 of the Code. If Rio Vista was classified as a corporation in any taxable year, either as a result of a failure to meet the Qualifying Income Exception or otherwise, Rio Vista's items of income, gain, loss and deduction would be reflected only on Rio Vista's tax return rather than being passed through to Rio Vista's unitholders, and Rio Vista's net income would be taxed at corporate rates. 35 If Rio Vista was treated as a corporation for federal income tax purposes, Rio Vista would pay tax on income at corporate rates, which is currently a maximum of 35%. Distributions to unitholders would generally be taxed again as corporate distributions, and no income, gains, losses, or deductions would flow through to the unitholders. Because a tax would be imposed upon Rio Vista as a corporation, the cash available for distribution to unitholders would be substantially reduced and Rio Vista's ability to make minimum quarterly distributions would be impaired. Consequently, treatment of Rio Vista as a corporation would result in a material reduction in the anticipated cash flow and after-tax return to unitholders and therefore would likely result in a substantial reduction in the value of Rio Vista's common units. Current law may change so as to cause Rio Vista to be taxable as a corporation for federal income tax purposes or otherwise subject Rio Vista to entity-level taxation. The Agreement provides that, if a law is enacted or existing law is modified or interpreted in a manner that subjects Rio Vista to taxation as a corporation or otherwise subjects Rio Vista to entity-level taxation for federal, state or local income tax purposes, then the minimum quarterly distribution amount and the target distribution amount will be adjusted downward to reflect the impact of that law on Rio Vista. Other. Rio Vista and its subsidiaries are involved with other proceedings, lawsuits and claims. Rio Vista believes that the liabilities, if any, ultimately resulting from such proceedings, lawsuits and claims should not materially affect its consolidated financial statements. Pursuant to the Omnibus Agreement, Penn Octane has agreed to indemnify Rio Vista for claims related to the Assets arising from events or conditions occurring or existing before completion of the Spin-Off. Distributions of Available Cash. All unitholders have the right to receive distributions from Rio Vista of "available cash" as defined in the partnership agreement in an amount equal to the minimum distribution of $0.25 per quarter per unit, plus any arrearages in the payment of the minimum quarterly distribution on the units from prior quarters. The General Partner receives a distribution corresponding to its 2% General Partnership Interest. The distributions are to be paid 45 days after the end of each calendar quarter. However, Rio Vista is prohibited from making any distributions to unitholders if it would cause an event of default, or an event of default is existing, under any obligation of Penn Octane which Rio Vista has guaranteed (see note H to the unaudited consolidated financial statements). Cash distributions from Rio Vista are shared by the holders of the common units and the General Partner interest as described in the partnership agreement based on a formula whereby the General Partner receives disproportionately more distributions per percentage interest than the holders of the common units as annual cash distributions exceed certain milestones. On both February 14, 2005 and May 13, 2005, Rio Vista made cash distributions of $487,000. Rio Vista has not declared a distribution for the quarter ended June 30, 2005. Rio Vista's ability to make distributions may be impacted by sales to PMI at acceptable volumes and margins, payments on its guarantees, costs and expenses and the inability to obtain additional financing on its pledged assets. Although Penn Octane is not required to do so, to the extent that Penn Octane has sufficient cash to do so, it may lend amounts to Rio Vista to meet the minimum distributions. If Rio Vista's revenues and other sources of liquidity after its quarterly distributions are not adequate to satisfy such payment obligations of Penn Octane and/or Penn Octane does not have the necessary cash to loan to Rio Vista, Rio Vista may be required to reduce or eliminate the quarterly distributions to unitholders and/or Penn Octane and/or Rio Vista may be required to raise additional funds to avoid foreclosure against its assets. However, there can be no assurance that such additional funding will be available on terms attractive to either Penn Octane or Rio Vista or available at all. 36 The following is a reconciliation of net income to distributable cash flow for the three months ended December 31, 2004, March 31, 2005 and June 30, 2005.

Three Months Ended -------------------------------------------- December 31, March 31, 2004 2005 June 30, 2005 -------------- ----------- --------------- Net income (loss) $ (63,000) $ 173,000 $ (728,000) Plus interest and other expense, net 101,000 119,000 179,000 Plus depreciation and amortization 178,000 205,000 205,000 Plus other non-cash expenses 344,000 - 17,000 -------------- ----------- --------------- EBITDA 560,000 497,000 (327,000) Less cash interest and other cash expense, net (101,000) (61,000) (64,000) -------------- ----------- --------------- Distributable cash flow (deficit) 459,000 436,000 (391,000) Distributable cash flow (deficit) applicable to general partner (9,000) (9,000) 8,000 -------------- ----------- --------------- Distributable cash flow (deficit) applicable to limited partners $ 450,000 $ 427,000 $ (383,000) ============== =========== ===============

Rio Vista utilizes two financial measures, EBITDA and distributable cash flow, which are not defined in GAAP. Management uses these financial measures because they are widely accepted financial indicators used by investors to compare partnership performance. In addition, management believes that these measures provide investors an enhanced perspective of the operating performance of Rio Vista's assets and the cash flow the business is generating. Neither EBITDA nor distributable cash flow are intended to represent cash flows for the period, nor are they presented as an alternative to net income. They should not be considered in isolation or as substitutes for a measure of performance prepared in accordance with GAAP. Increased expenses. As a result of the Spin-Off, Rio Vista estimates that operating expenses will increase by approximately $450,000 on an annual basis as a result of additional public company and income tax preparation costs related to Rio Vista. Sales to PMI. On March 31, 2004, Penn Octane's sales agreement with PMI (the "Contract") expired. Prior to the Spin-Off, during the period April 1, 2004 through September 30, 2004, Penn Octane and PMI entered into monthly agreements for the sale of LPG. During the months of October 2004 through December 2004, Rio Vista and PMI entered into monthly agreements for the sale of LPG ("Monthly 2004 Contracts"). During December 2004, Rio Vista and PMI entered into a three month agreement for the period January 1, 2005 to March 31, 2005 for the minimum sale of 11.7 million gallons of LPG for the months of January and February 2005 and 11.1 million gallons of LPG for the month of March 2005 (the "Quarterly Agreement") at reduced margins compared with those in effect during 2004. Actual volumes sold were 12.7 million gallons, 9.9 million gallons and 9.6 million gallons for January, February and March 2005, respectively. In April 2005, Rio Vista entered into a one month contract with PMI for the sale of a minimum of 10.5 million gallons at a further reduced margin. On May 5, 2005, Rio Vista entered into a contract with PMI for the sale of a minimum of 6.0 million gallons of LPG for the period May 5, 2005 to May 31, 2005 at the reduced margin received in April 2005. For the period May 1, 2005 to May 4, 2005, PMI did not purchase any LPG from Rio Vista. Actual volumes of LPG sold to PMI for April and May 2005 were 10.8 million gallons and 6.1 million gallons, respectively. The shortfall for the month of February 2005 was attributable to Penn Octane, not having a sufficient supply of LPG to meet minimum contract volume. The shortfall for the month of March 2005 was attributable to PMI not purchasing the minimum contract volume. In accordance with the Quarterly Agreement, PMI paid approximately $104,000 representing the total amount due associated with the shortfall volumes for March 2005. 37 Effective June 4, 2005, Rio Vista entered into an agreement with PMI for the period June 4, 2005 through March 31, 2006 for the purchase of LPG (the "PMI Agreement"). PMI did not purchase LPG from Rio Vista during the period June 1 - June 3, 2005. The following table sets forth the minimum monthly volume of LPG that PMI has committed to purchase from Rio Vista pursuant to the PMI Agreement.

Month Minimum Volumes -------------- ------------------------ (in millions of gallons) June 2005 3.5 July 2005 3.5 August 2005 3.5 September 2005 5.7 October 2005 8.1 November 2005 11.7 December 2005 11.7 January 2006 11.7 February 2006 11.7 March 2006 8.1

Actual volumes of LPG sold to PMI for June and July 2005 were 3.5 million gallons and 3.5 million gallons, respectively. Under the terms of the PMI Agreement, the sale price of LPG will be at the same margins in effect during April and May 2005. Rio Vista's management believes that PMI's reduction of volume commitments for April 2004 through March 2006 is based on additional LPG production by PEMEX being generated from the Burgos Basin field in Reynosa, Mexico, an area within the proximity of Rio Vista's Matamoros Terminal Facility and increased competition from U.S. suppliers including Valero (see Recent Trends above). PMI has primarily used the Matamoros Terminal Facility to load LPG purchased from Penn Octane prior to the Spin-Off and from Rio Vista, subsequent thereto, for distribution by truck in Mexico. Rio Vista will continue to use the Brownsville Terminal Facility in connection with LPG delivered by railcar to other customers, storage and as an alternative terminal in the event the Matamoros Terminal Facility cannot be used. Seasonality. Rio Vista's gross profit is dependent on sales volume of LPG to PMI, which fluctuates in part based on the seasons. The demand for LPG is strongest during the winter season. LPG Supply Agreement. Penn Octane entered into the LPG Supply Agreement with Rio Vista pursuant to which Rio Vista has agreed to purchase all of its LPG requirements for sales which utilize the assets transferred to Rio Vista by Penn Octane to the extent Penn Octane is able to supply such LPG requirements. The LPG Supply Agreement further provides that Rio Vista has no obligation to purchase LPG from Penn Octane to the extent the distribution of such LPG to Rio Vista's customers would not require the use of any of the assets Penn Octane contributed to Rio Vista or Penn Octane ceases to have the right to access the Leased Pipeline. 38 Under the LPG Supply Agreement, Penn Octane supplies all of Rio Vista's LPG requirements in connection with its LPG sales obligations to PMI. The purchases of the LPG are at fluctuating prices and are determined based on the cost of LPG under Penn Octane's agreements with its LPG suppliers for volumes sold to Rio Vista for sale to PMI or to other Rio Vista customers, other direct costs related to PMI and other LPG sales of Rio Vista and a formula that takes into consideration operating costs of Penn Octane and Rio Vista. Rio Vista expects the aggregate costs per gallon to purchase LPG (less any applicable adjustments) to be below the aggregate sales prices per gallon of LPG sold to PMI. Rio Vista believes that its LPG Supply Agreement with Penn Octane provides it with an advantage over competitors in the supply of LPG to PMI based on Penn Octane's adequate volumes and price provided for in its agreements with its LPG suppliers, and Penn Octane's Leased Pipeline which takes the LPG directly to Rio Vista's Brownsville Terminal Facility from those suppliers. The Leased Pipeline's capacity is estimated to be between 25.0 million and 30.0 million gallons per month. Under the terms of the Exxon Supply Contract, Penn Octane must provide letters of credit in amounts equal to the cost of the product to be purchased. In addition, the cost of the product purchased is tied directly to overall market conditions. As a result, Penn Octane's existing letter of credit facility may not be adequate to meet the letter of credit requirements under the Exxon Supply Contract or other suppliers if there are increases in quantities of LPG purchased and/or to finance future price increases of LPG. The LPG Supply Agreement terminates on the earlier to occur of: - Penn Octane ceases to have the right to access the Leased Pipeline that connects to Rio Vista's Brownsville Terminal Facility; and - Rio Vista ceases to sell LPG using any of the assets contributed by Penn Octane to Rio Vista pursuant to the Spin-Off. Mexican Operations. Under current Mexican law, foreign ownership of Mexican entities involved in the distribution of LPG or the operation of receiving, conveying, storing and delivering LPG to final users is prohibited. Foreign ownership is permitted in the transportation and storage of LPG. Mexican law also provides that an entity with a permit to transport LPG is not permitted to obtain permits for the other defined LPG activities (storage or distribution). PennMex has a transportation permit and Termatsal owns, leases, or is in the process of obtaining the land or rights of way used in the construction of the Mexican portion of the US-Mexico Pipelines, and owns the Mexican portion of the assets comprising the US-Mexico Pipelines and the Matamoros Terminal Facility. Rio Vista's consolidated Mexican affiliate, Tergas, S. de R.L. de C.V. ("Tergas"), has been granted the permit to operate the Matamoros Terminal Facility and Rio Vista relies on Tergas' permit to continue its delivery of LPG at the Matamoros Terminal Facility. Rio Vista pays Tergas its actual cost for distribution services at the Matamoros Terminal Facility plus a small profit. Through Rio Vista's operations in Mexico and the operations of the Mexican subsidiaries and Tergas, Rio Vista is subject to the tax laws of Mexico which, among other things, require that Rio Vista comply with transfer pricing rules, the payment of income, asset and ad valorem taxes, and possibly taxes on distributions in excess of earnings. In addition, distributions to foreign entities, including dividends and interest payments may be subject to Mexican withholding taxes. During July 2003, Penn Octane acquired an option to purchase Tergas, which is 95% owned by Vicente Soriano, an employee of Penn Octane, and the remaining balance owned by Abelardo Mier, a consultant of Penn Octane, for a nominal price of approximately $5,000. The option was transferred to Rio Vista on September 30, 2004. Deregulation of the LPG Industry in Mexico. The Mexican petroleum industry is governed by the Ley Reglarmentaria del Art culo 27 Constitutional en el Ramo del Petr leo (the Regulatory Law to Article 27 of the Constitution of Mexico concerning Petroleum Affairs (the "Regulatory Law")), Reglamento de Gas Licuado de Petroleo (Regulation of LPG) and Ley Org nica del Petr leos Mexicanos y Organismos Subsidiarios (the Organic Law of Petr leos Mexicanos and Subsidiary Entities (the "Organic Law")). Under Mexican law and related regulations, PEMEX is entrusted with the central planning and the strategic management of Mexico's petroleum industry, including importation, sales and transportation of LPG. In carrying out this role, PEMEX controls pricing and distribution of various petrochemical products, including LPG. 39 Beginning in 1995, as part of a national privatization program, the Regulatory Law was amended to permit private entities to transport, store and distribute natural gas with the approval of the Ministry of Energy. As part of this national privatization program, the Mexican Government is expected to deregulate the LPG market ("Deregulation"). In June 1999, the Regulation of LPG was enacted to permit foreign entities to participate without limitation in the defined LPG activities related to transportation and storage. However, foreign entities are prohibited from participating in the distribution of LPG in Mexico. Upon Deregulation, Mexican entities will be able to import LPG into Mexico. Under Mexican law, an entity with a permit to transport LPG is not permitted to obtain permits for the other defined LPG activities (storage and distribution). Rio Vista expects to sell LPG directly to independent Mexican distributors as well as PMI upon Deregulation. Rio Vista anticipates that the independent Mexican distributors will be required to obtain authorization from the Mexican government for the importation of LPG upon Deregulation prior to entering into contracts with Rio Vista. During July 2001, the Mexican government announced that it would begin to accept applications from Mexican companies for permits to allow for the importation of LPG pursuant to provisions already provided for under existing Mexican law. In connection with the above, in August 2001, Tergas received a one year permit from the Mexican government to import LPG. During September 2001, the Mexican government decided to delay the implementation of Deregulation and asked Tergas to defer use of the permit and as a result, Penn Octane did not sell LPG to distributors other than PMI. In March 2002, the Mexican government again announced its intention to issue permits for free importation of LPG into Mexico by distributors and others beginning August 2002, which was again delayed. To date the Mexican government has continued to delay implementation of Deregulation. Tergas' permit to import LPG expired during August 2002. Tergas intends to obtain a new permit when the Mexican government again begins to accept applications. As a result of the foregoing, it is uncertain as to when, if ever, Deregulation will actually occur and the effect, if any, it will have on Rio Vista. However, should Deregulation occur, it is Rio Vista's intention to sell LPG directly to distributors in Mexico as well as to PMI. The point of sale for LPG which flows through the US-Mexico Pipelines for delivery to the Matamoros Terminal Facility is the United States-Mexico border. For LPG delivered into Mexico, PMI is the importer of record. Partners' Capital. Rio Vista's beginning capital was contributed by Penn Octane to Rio Vista's operating partnership in the form of assets consisting primarily of terminal assets located in Brownsville, Texas, and Matamoros, Mexico, as well as the pipelines connecting these terminal facilities. The contribution to Rio Vista was recorded at Penn Octane's historical cost of such assets on the date of the Spin-Off ($14.6 million). COMMON UNITS In connection with the Spin-Off on September 30, 2004, Rio Vista issued 1,910,656 common units to the holders of Penn Octane common stock. The common units represent limited partner interests in Rio Vista. The holders of common units are entitled to participate in Rio Vista's distributions and exercise the rights or privileges available to limited partners under the Agreement. The holders of common units have only limited voting rights on matters affecting Rio Vista. Holders of common units have no right to elect the General Partner or its managers on an annual or other continuing basis. Penn Octane elects the managers of the General Partner. Although the General Partner has a fiduciary duty to manage Rio Vista in a manner beneficial to Rio Vista and its unitholders, the managers of the General Partner also have a fiduciary duty to manage the General Partner in a manner beneficial to Penn Octane and its stockholders. The General Partner generally may not be removed except upon the vote of the holders of at least 80% of the outstanding common units; provided, however, if at any time any person or group, other than the General Partner and its affiliates, or a direct or subsequently approved transferee of the General Partner or its affiliates, acquires, in the aggregate, beneficial ownership of 20% or more of any class of units then outstanding, that person or group will lose voting rights on all of its units and the units may not be voted on any matter and will not be considered to be outstanding when sending notices of a meeting of unitholders, calculating required votes, determining the presence of a quorum or for other similar purposes. In addition, the partnership agreement contains provisions limiting the ability of holders of common units to call meetings or to acquire information about Rio Vista's operations, as well as other provisions limiting the holders of common units ability to influence the manner or direction of management. 40 GENERAL PARTNER INTEREST The General Partner of Rio Vista owns a 2% general partner interest in Rio Vista. The General Partner is currently 100% owned by Penn Octane. Penn Octane has granted options to Mr. Richter and to Shore Capital LLC ("Shore Capital"), an affiliate of Richard Shore, Jr., former President of Penn Octane and Chief Executive Officer of the General Partner, to purchase 50% of its general partner interest. The options expire on July 10, 2006. Following the exercise of any of these options, Penn Octane will retain voting control of the General Partner pursuant to a voting agreement. The General Partner generally has unlimited liability for the obligations of Rio Vista, such as its debts and environmental liabilities, except for those contractual obligations of Rio Vista that are expressly made without recourse to the General Partner. OPTIONS AND WARRANTS Rio Vista has no U.S. employees and is managed by its General Partner. Rio Vista applies APB 25 for warrants granted to employees and managers of the General Partner and SFAS 123 for warrants issued to acquire goods and services from non-employees. COMMON UNIT WARRANTS. In connection with an employment agreement with Mr. Shore, Shore Capital, received warrants to acquire 97,415 common units of Rio Vista with an exercise price of $8.47 per common unit. The warrants are exercisable beginning on October 1, 2004 and expire on July 10, 2006. On March 9, 2005, the board of managers of the General Partner approved the Rio Vista 2005 Equity Incentive Plan (the "2005 Plan"). The 2005 Plan permits the grant of common unit options, common unit appreciation rights, restricted common unit and phantom common units to any person who is an employee (including to any executive officer) or consultant of Rio Vista or the General Partner or any affiliate of Rio Vista or the General Partner. The 2005 Plan provides that each outside manager of the General Partner shall be granted a common unit option once each fiscal year for not more than 5,000 common units, in an equal amount as determined by the board of managers. The aggregate number of common units authorized for issuance as awards under the 2005 Plan is 750,000. The 2005 Plan shall remain available for the grant of awards until March 9, 2015, or such earlier date as the board of managers may determine. The 2005 Plan is administered by the compensation committee of the board of managers. Under the terms of the Agreement and applicable rules of the Nasdaq Stock Market, no approval by the common unitholders of Rio Vista was required. 41 On March 9, 2005, the board of managers of the General Partner approved the grant of options to purchase a total of 108,750 common units under the 2005 Plan. Of the total number of options granted, 93,750 were granted to executive officers of the General Partner and Mr. Richter and 15,000 were issued to outside managers of the General Partner. The exercise price for the options is $12.51 per common unit, which is the average of the high and low sales prices for Rio Vista common units as reported by the Nasdaq Stock Market on March 9, 2005. The options granted to executive officers (including Mr. Richter) were fully vested on the date of grant. The options granted to outside managers vest in equal monthly installments over a period of 12 months from the date of grant. All options become fully exercisable upon a change in control event and expire three years from the date of grant. LOAN DISCOUNT ON PENN OCTANE'S DEBT RELATED TO DETACHABLE WARRANTS. During January 2004, in connection with $1.8 million of debt obligations of Penn Octane, Penn Octane agreed to issue, in the future, an aggregate of 110,250 warrants to purchase Rio Vista common units ("Rio Vista Warrants"). The exercise price of the warrants was to be determined based on the amount of the first quarterly distribution paid by Rio Vista. As a result of the approval of the payment of Rio Vista's first cash distribution on January 14, 2005 (see below), Rio Vista granted the immediately exercisable warrants having an exercise price of $5.00 and recorded a discount of approximately $422,000 which is reflected as interest expense ratably amortized from the grant date of January 14, 2005 to December 15, 2005, the maturity date of the debt obligations. For the three months and six months ended June 30, 2005 amortization expense was $115,000 and $173,000, respectively. The Rio Vista Warrants will expire on December 15, 2006. The Spin-Off. During September 2003, Penn Octane's board of directors and the independent committee of its board of directors formally approved the terms of the Spin-Off and Rio Vista filed a Form 10 registration statement with the Securities and Exchange Commission. On September 30, 2004, all of Penn Octane's limited partnership interest in Rio Vista was distributed to Penn Octane's stockholders. Each stockholder of Penn Octane on September 30, 2004, received one common unit of the limited partnership interest of Rio Vista for every eight shares of Penn Octane's common stock owned. As a result of the Spin-Off, Rio Vista owns and operates the LPG, distribution, transportation and marketing business previously conducted by Penn Octane. All of the assets transferred to Rio Vista in connection with the Spin-Off have been transferred at historical costs and related accumulated depreciation of Penn Octane at the date of the Spin-Off. Rio Vista began selling LPG to PMI upon the completion of the Spin-Off and at that time also began purchasing LPG from Penn Octane under the LPG Supply Agreement. The General Partner is responsible for managing the operations and activities of Rio Vista. Common unitholders do not participate in the management of Rio Vista. Penn Octane controls Rio Vista by virtue of its current ownership, management and voting control of the General Partner. Therefore, Rio Vista is accounted for as a consolidated subsidiary of Penn Octane for financial accounting purposes. INTERCOMPANY PURCHASE AGREEMENT FOR LPG Penn Octane entered into the LPG Supply Agreement with Rio Vista pursuant to which Rio Vista has agreed to purchase all of its LPG requirements for sales which utilize the assets transferred to Rio Vista by Penn Octane to the extent Penn Octane is able to supply such LPG requirements (see LPG Supply Agreement above). OMNIBUS AGREEMENT In connection with the Spin-Off, Penn Octane entered into an Omnibus Agreement with Rio Vista that governs, among other things, indemnification obligations among the parties to the agreement, related party transactions, the provision of general administration and support services by Penn Octane. The Omnibus Agreement prohibits Rio Vista from entering into any material agreement with Penn Octane without the prior approval of the conflicts committee of the board of managers of the General Partner. For purposes of the Omnibus Agreement, the term material agreements means any agreement between Rio Vista and Penn Octane that requires aggregate annual payments in excess of $100,000. 42 The Omnibus Agreement may be amended by written agreement of the parties; provided, however that it may not be amended without the approval of the conflicts committee of the General Partner if such amendment would adversely affect the unitholders of Rio Vista. The Omnibus Agreement has an initial term of five years that automatically renews for successive five-year terms and, other than the indemnification provisions, will terminate if Rio Vista is no longer an affiliate of Penn Octane. Realization of Assets. Rio Vista's unaudited consolidated balance sheet included elsewhere herein has been prepared in conformity with accounting principles generally accepted in the United States of America, which contemplate continuation of Rio Vista as a going concern. Rio Vista is dependent on Penn Octane's ability to deliver adequate quantities of LPG at an acceptable price for ultimate sale to PMI, to provide credit to Rio Vista for such purchases and to provide management of its operations. Currently, Rio Vista's only source of revenue is from sales of LPG to PMI and it operates under a short-term sale agreement with PMI which provides for monthly volumes which are materially less than Penn Octane's historical monthly volumes and margins. As a result, Penn Octane's and Rio Vista's gross profit have been materially reduced and may continue to decline and their cash flow and available credit may be insufficient to absorb such additional reductions in gross profit. Rio Vista has guaranteed certain of Penn Octane's obligations. Substantially all of Rio Vista's and Penn Octane's assets are pledged or committed to be pledged as collateral on $1.8 million of Penn Octane's existing debt and the RZB Credit Facility, and therefore, both Rio Vista and Penn Octane may be unable to obtain additional financing collateralized by those assets. Penn Octane's Report of Independent Certified Public Accountants on the consolidated financial statements of Penn Octane at July 31, 2004 contains an explanatory paragraph which describes an uncertainty about Penn Octane's ability to continue as a going concern. If Penn Octane's and Rio Vista's cash flows are not adequate to pay their obligations, Penn Octane and/or Rio Vista may be required to raise additional funds to avoid foreclosure by Penn Octane's creditors. There can be no assurance that such additional funding will be available on terms attractive to either Penn Octane or Rio Vista or available at all. If additional amounts cannot be raised and cash flow is inadequate, Penn Octane and/or Rio Vista would likely be required to seek other alternatives which include the sale of assets, closure of operations and/or protection under the U.S. bankruptcy laws. In view of the matters described in the preceding paragraphs, recoverability of the recorded asset amounts shown in Rio Vista's unaudited consolidated balance sheet including elsewhere herein, is dependent upon the ability of Penn Octane to continue as a going concern and continued sales of LPG to PMI at acceptable volumes and margins to provide sufficient cash flow to pay Rio Vista's expenses and guarantees of Penn Octane's obligations assuming Penn Octane's inability to pay such obligations. The unaudited consolidated balance sheet included elsewhere herein, does not include any adjustments related to the recoverability and classification of recorded asset amounts or amounts and classification of liabilities that might be necessary should Rio Vista be unable to continue in existence. To provide Rio Vista with the ability it believes necessary to continue in existence, management is taking steps to (i) diversify Rio Vista's operations to reduce dependency on sales of LPG and (ii) sell its LPG assets. 43 IMPACT OF INFLATION Inflation in the United States and Mexico has been relatively low in recent years and did not have a material impact on the consolidated financial statements of Rio Vista. However, inflation remains a factor in the United States and Mexico economies and could increase Rio Vista's cost to acquire or replace property, plant and equipment as well as our labor and supply costs. Rio Vista may be adversely impacted as a result of increases in LPG prices, which are related to oil and natural gas prices, because of limits on Penn Octane's credit facility. ENVIRONMENTAL MATTERS Rio Vista's operations are subject to environmental laws and regulations adopted by various governmental authorities in the jurisdictions in which these operations are conducted. Under the Omnibus Agreement, Penn Octane will indemnify Rio Vista for five years after the completion of the Spin-Off against certain potential environmental liabilities associated with the assets it contributed to Rio Vista relating to events or conditions that existed before the completion of the Spin-Off. RECENTLY ISSUED FINANCIAL ACCOUNTING STANDARDS During 2004, Rio Vista adopted Financial Accounting Standards Board Interpretation No. 46, "Consolidation of Variable Entities" ("FIN 46"), which was amended by FIN 46R. This interpretation of Accounting Research Bulletin No. 51, "Consolidated Financial Statements", addresses consolidation by business enterprises of variable interest entities ("VIE") that do not have sufficient equity investment at risk to permit the entity to finance its activities without additional subordinated financial support. FIN 46R requires the beneficiary of a VIE to consolidate in its financial statements the assets, liabilities and results of operations of the VIE. Tergas, an affiliate of Rio Vista, is a VIE and therefore, its assets, liabilities and results of operations have been included in the accompanying consolidated financial statements of Rio Vista. In November 2004, the FASB issued Statement of Financial Accounting Standard No. 151, "Inventory Costs - An Amendment of ARB No. 43 Chapter 4" ("SFAS 151") which clarifies that abnormal amounts of idle facility expense, freight, handling costs and spoilage should be expensed as incurred and not included in overhead. Further, SFAS 151 requires that allocation of fixed production overheads to conversion costs should be based on normal capacity of the production facilities. The provisions in SFAS 151 are effective for inventory costs incurred during fiscal years beginning after June 15, 2005. Rio Vista has determined that SFAS 151 will not have a material impact on their consolidated results of operations, financial position or cash flows. During December 2004, the Financial Accounting Standards Board ("FASB") issued Statement of Financial Accounting Standard No. 123 (revised 2004) "Share-Based Payment" ("SFAS 123R"). SFAS 123R replaces SFAS 123, "Accounting for Stock-Based Compensation", and supercedes APB Opinion 25, "Accounting for Stock Issued to Employees" ("APB 25"). SFAS 123R requires that the cost of share-based payment transactions (including those with employees and non-employees) be recognized in the financial statements as compensation cost. That cost will be measured based on the fair value of equity or liability instrument issued. SFAS 123R is effective for Rio Vista beginning January 1, 2006. Rio Vista will apply the modified prospective method as provided for in SFAS 123R, and therefore the financial statements of Rio Vista for interim and annual periods prior to the adoption of SFAS 123R will not reflect any restatements. In December 2004, the FASB issued Statement of Financial Accounting Standard No. 153, "Exchanges of Nonmonetary Assets-An Amendment of APB Opinion No. 29" ("SFAS 153"). The amendments made by SFAS 153 are based on the principle that exchanges on nonmonetary assets should be measured based on the fair value of the assets exchanged. The provisions in SFAS 153 are effective for nonmonetary asset exchanges occurring in fiscal periods beginning after June 15, 2005. Early application is permitted and companies must apply the standard prospectively. Rio Vista has determined that SFAS 153 will not have a material impact on their consolidated results of operations, financial position or cash flows. 44 In May 2005, the FASB issued Statement of Financial Accounting Standard No. 154, "Accounting Changes and Error Corrections" (SFAS154). This new standard replaces APB Opinion No. 20, "Accounting Changes" and FASB Statement No. 3, "Reporting Accounting Changes in Interim Financial Statements". Among other changes, SFAS 154 requires that a voluntary change in accounting principle be applied retrospectively with all prior period financial statements presented on the new accounting principle, unless it is impracticable to do so. SFAS 154 also provides that (1) a change in method of depreciating or amortizing a long-lived nonfinancial asset be accounted for as a change in estimate (prospectively) that was effected by a change in accounting principle, and (2) correction of errors in previously issued financial statements should be termed a "restatement." The new standard is effective for accounting changes and correction of errors made in fiscal years beginning after December 15, 2005. Early adoption of this standard is permitted for accounting changes and correction of errors made in fiscal years beginning after June 1, 2005. Rio Vista has determined that SFAS 154 will not have a material impact on their consolidated results of operations, financial position or cash flows. CRITICAL ACCOUNTING POLICIES The consolidated financial statements of Rio Vista reflect the selection and application of accounting policies which require management to make significant estimates and judgments. See note B to Rio Vista's consolidated financial statements included in its Annual Report on Form 10-K for the fiscal year ended December 31, 2004, "Summary of Significant Accounting Policies". Rio Vista believes that the following reflect the more critical accounting policies that affect the financial position and results of operations. Revenue recognition - Rio Vista expects in the future to enter into sales agreements to sell LPG for future delivery. Rio Vista will not record sales until the LPG is delivered to the customer. Impairment of long-lived assets - The determination of whether impairment has occurred is based on an estimate of undiscounted cash flows attributable to assets in future periods. If impairment has occurred, the amount of the impairment loss recognized will be determined by estimating the fair value of the assets and recording a loss if the fair value is less than the carrying value. Assessments of impairment are subject to management's judgments and based on estimates that management is required to make. Depreciation and amortization expenses - Property, plant and equipment are carried at cost less accumulated depreciation and amortization. Depreciation and amortization rates are based on management's estimate of the future utilization and useful lives of the assets. Unit-based compensation - Rio Vista accounts for unit-based compensation using the provisions of APB 25 (intrinsic value method), which is permitted by SFAS 123. The difference in net income, if any, between the intrinsic value method and the method provided for by SFAS 123 (fair value method) is required to be disclosed in the financial statements on an annual and interim basis as a result of the issuance of SFAS 148. Allowance for doubtful accounts - The carrying value of trade accounts receivable is based on estimated fair value. The determination of fair value is subject to management's judgments and is based on estimates that management is required to make. STATEMENT BY MANAGEMENT CONCERNING REVIEW OF INTERIM INFORMATION BY INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS. The unaudited consolidated financial statements included in this filing on Form 10-Q have been reviewed by Burton McCumber & Cortez, L.L.P., independent certified public accountants, in accordance with established professional standards and procedures for such review. The report of Burton McCumber & Cortez, L.L.P. commenting on their review, accompanies the unaudited consolidated financial statements included in Item 1 of Part I. 45 ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK. To the extent that Rio Vista maintains quantities of LPG inventory in excess of commitments for quantities of undelivered LPG and/or has commitments for undelivered LPG in excess of inventory balances, Rio Vista is exposed to market risk related to the volatility of LPG prices. In the event that inventory balances exceed commitments for undelivered LPG, during periods of falling LPG prices, Rio Vista may sell excess inventory to customers to reduce the risk of these price fluctuations. In the event that commitments for undelivered LPG exceed inventory balances, Rio Vista may purchase contracts which protect it against future price increases of LPG. Rio Vista does not maintain quantities of LPG inventory in excess of quantities actually ordered by PMI. Therefore, Rio Vista has not currently entered into and does not currently expect to enter into any arrangements in the future to mitigate the impact of commodity price risk. Rio Vista does not have any debt. Trade accounts receivable from PMI and Rio Vista's trade and other accounts payable generally do not bear interest. Penn Octane's credit facility with RZB for which Rio Vista is responsible for some of the costs provides for cash advances at a current variable interest rate. Fees paid to RZB for letters of credit are based on a fixed schedule as provided in Penn Octane's agreement with RZB. Therefore, Rio Vista currently has limited, if any, interest rate risk. Rio Vista routinely converts U.S. dollars into Mexican pesos to pay terminal operating costs and income taxes. Such costs are expected to be less than $1 million per year and Rio Vista expects such costs will remain at less than $1 million in any year. Rio Vista does not maintain Mexican peso bank accounts with other than nominal balances. Therefore, Rio Vista has limited, if any, risk related to foreign currency exchange rates. ITEM 4. CONTROLS AND PROCEDURES. The General Partner's management, including the principal executive officer and principal financial officer, conducted an evaluation of Rio Vista's disclosure controls and procedures, as such term is defined under Rule 13a-14(c) promulgated under the Securities Exchange Act of 1934, as amended, as of the end of the period. Based on their evaluation, the General Partner's principal executive officer and principal accounting officer concluded that Rio Vista's disclosure controls and procedures are effective. There have been no significant changes (including corrective actions with regard to significant deficiencies or material weaknesses) in Rio Vista's internal controls or in other factors that could significantly affect these controls subsequent to the date of the evaluation referenced in paragraph above. 46 Part II ITEM 1. LEGAL PROCEEDINGS See note H to Rio Vista's unaudited consolidated financial statements included in its Quarterly Report on Form 10-Q for the six months ended June 30, 2005. ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS None. ITEM 3. DEFAULTS UPON SENIOR SECURITIES None. ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS None. ITEM 5. OTHER INFORMATION None. ITEM 6. EXHIBITS THE FOLLOWING EXHIBITS ARE INCORPORATED BY REFERENCE TO PREVIOUSLY FILED REPORTS, AS NOTED. Exhibit No. ------------ 10.1* Rio Vista Energy Partners L.P. 2005 Equity Incentive Plan (incorporated by reference to Rio Vista's Annual Report on Form 10-K for the year ended December 31, 2004 filed on April 12, 2005, SEC File No. 000-50394) * indicates management contract or compensatory plan or arrangement. 47 THE FOLLOWING EXHIBITS ARE FILED AS PART OF THIS REPORT: Exhibit No. ------------ 10.2 Matamoros LPG Mix Purchase and Sales Agreement made and entered into as of June 4, 2005, by and between Rio Vista Energy Partners L.P. and P.M.I. Trading Limited. 10.3 Purchase and Sale Agreement dated as of August 15, 2005 between Rio Vista Operating Partnership L.P. and TransMontaigne Product Services Inc. 10.4 Promissory Note dated August 15, 2005 between Rio Vista Operating Partnership L.P. and TransMontaigne Product Services Inc. 10.5 Security Agreement dated August 15, 2005 between Rio Vista Operating Partnership L.P. and TransMontaigne Product Services Inc. 31.1 Certification Pursuant to Rule 13a-14(a) / 15d - 14(a) of the Exchange Act 31.2 Certification Pursuant to Rule 13a-14(a) / 15d - 14(a) of the Exchange Act 32 Certification Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the Sarbanes - Oxley Act of 2002 48 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed by the following persons on behalf of the registrant and in the capacities and on the dates indicated. RIO VISTA ENERGY PARTNERS L.P. August 19, 2005 By: /s/ Ian T. Bothwell ------------------------------------------------- Ian T. Bothwell Chief Financial Officer (principal accounting and Financial officer) of Rio Vista GP LLC, general partner of Rio Vista Energy Partners L.P. 49