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-----BEGIN PRIVACY-ENHANCED MESSAGE-----Proc-Type: 2001,MIC-CLEAROriginator-Name: [email protected]: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQABMIC-Info: RSA-MD5,RSA, QHyF68uRjdc/LoGd7VY7/Hv+c8lAAp4RdDA/USMc3ikvbHz/qLfxXX1Sem5VWuOU AJzla27pS3eCszx23rDZ1Q==

0001362310-08-001682.txt : 200803310001362310-08-001682.hdr.sgml : 2008033120080331090031ACCESSION NUMBER:0001362310-08-001682CONFORMED SUBMISSION TYPE:8-KPUBLIC DOCUMENT COUNT:27CONFORMED PERIOD OF REPORT:20080331ITEM INFORMATION:Regulation FD DisclosureITEM INFORMATION:Financial Statements and ExhibitsFILED AS OF DATE:20080331DATE AS OF CHANGE:20080331

FILER:

COMPANY DATA:COMPANY CONFORMED NAME:RIO VISTA ENERGY PARTNERS LPCENTRAL INDEX KEY:0001260828STANDARD INDUSTRIAL CLASSIFICATION:WHOLESALE-PETROLEUM & PETROLEUM PRODUCTS (NO BULK STATIONS) [5172]IRS NUMBER:200153267STATE OF INCORPORATION:DEFISCAL YEAR END:1231

FILING VALUES:FORM TYPE:8-KSEC ACT:1934 ActSEC FILE NUMBER:000-50394FILM NUMBER:08721701

BUSINESS ADDRESS:STREET 1:820 GESSNER ROADSTREET 2:SUITE 1285CITY:HOUSTONSTATE:TXZIP:77024BUSINESS PHONE:713-467-8235

MAIL ADDRESS:STREET 1:820 GESSNER ROADSTREET 2:SUITE 1285CITY:HOUSTONSTATE:TXZIP:77024

8-K1c72843e8vk.htmFORM 8-K

Filed by Bowne Pure Compliance

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 31, 2008

Rio Vista Energy Partners L.P.
(Exact name of registrant as specified in its charter)

Delaware 000-50394 20-0153267

(State or other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

1313 E. Alton Gloor Blvd., Suite J
Brownsville, Texas
78526

(Address of Principal Executive Offices) (Zip Code)

Registrants telephone number, including area code: (956) 831-0886

Inapplicable

(Former name or former address if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrantunder any of the following provisions:

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

1

Item7.01. RegulationFD Disclosure.

Rio Vista has attached as exhibits a press release and an overview outlining Rio Vistascurrent business strategy, recent developments and/or selected financial information andprojections. The press release and overview are incorporated by reference into this Item7.01.

The information included in this Item7.01, including the attached Exhibit99.1 and Exhibit99.2, shall not be deemed filed for purposes of Section18 of the Securities and Exchange Act of1934, as amended (the Exchange Act), or incorporated by reference in any filing under theSecurities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth byspecific reference in such filing.

Item9.01. Financial Statements and Exhibits

(d) Exhibits.

99.1 Rio Vista Company Overview March2008.

99.2 Press release issued by Rio Vista on March31, 2008 providing operational update

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has dulycaused this report to be signed on its behalf by the undersigned hereunto duly authorized.

RIO VISTA ENERGY PARTNERS L.P.

By: Rio Vista GP LLC, its
General Partner

By: /s/ Ian T. Bothwell

Name:

Ian T. Bothwell

Title:

Acting Chief Executive Officer,Acting President, Vice President, Chief Financial Officer, Treasurer andAssistant Secretary (Principal Executive, Financial and Accounting Officer)

Date: March31, 2008

3

EXHIBIT INDEX

Exhibit No. Description

99.1

Rio Vista Company Overview March2008

99.2

Press release issued by Rio Vista on March31, 2008 providing operational update

4

EX-99.12c72843exv99w1.htmEXHIBIT 99.1

Filed by Bowne Pure Compliance

Exhibit 99.1

Overview

March 2008

Forward Looking Statements

Forward Looking Statements

This Presentation contains forward-looking statements, estimates and projections with respect to the anticipated futureperformance of Rio Vista that may be deemed to be "forward-looking statements." These statements, estimates andprojections reflect various assumptions made by Rio Vista concerning anticipated results, which may not prove to be correct.All statements contained in the presentation that address operating performance, future direction, management and controlof Rio Vista, events or developments that are expected to occur in the future (including statements related to the timing orextent of changes in commodity prices for oil and gas, the ability of Rio Vista to raise necessary capital for developmentand/or replacement of production and reserves, the ability of Rio Vista to replace production and reserves, earnings,expectations, sales of assets, capital expenditures or statements expressing general optimism about future operating results)are forward-looking statements. Actual results could differ materially from those reflected in the forward-looking statementscontained herein as a result of a variety of factors, many of which are beyond Rio Vista's control.

No Representations or Warranties

This Presentation has been prepared by Rio Vista and includes information from other sources believed by management tobe reliable. Rio Vista has not independently verified any of the information from other sources. Rio Vista does not make anyrepresentation or warranty, express or implied, as to the accuracy or completeness of any of the information set forth herein.This Presentation may contain summaries of the terms of certain documents and agreements, but reference is made to theactual documents and agreements for the complete information contained therein. The information contained herein is as ofthe date hereof and is subject to change, completion or amendment without notice. Rio Vista assumes no responsibility forupdating this information.

Leadership Overview

Douglas Manner, Chairman of the Board of Managers of Rio Vista GP LLC, general partner of Rio Vista EnergyPartners L.P.

Significant exploration and production experience

Current CEO of Westside Energy Corporation (AMEX: WHT)

Former VP and COO of Gulf Canada

Previous Senior Vice President and Chief Operating Officer of Kosmos Energy, LLC (backed by both Blackstone andWarburg Pincus), a private energy company exploring for oil and gas in the offshore regions of West Africa

Spent 15 years at Ryder Scott Petroleum, a leading reservoir engineering firm

Ian Bothwell, Acting President and Chief Executive Officer of Rio Vista GP LLC and Penn Octane Corporation

In November 2006, appointed acting Chief Executive Officer and acting President of Rio Vista GP LLC and PennOctane Corporation

Effective September 30, 2004, elected to serve as Chief Financial Officer, Vice President and Assistant Secretary ofRio Vista GP LLC

Effective July 10, 2003, elected Treasurer of Rio Vista GP LLC

Named Vice President, Treasurer, Chief Financial Officer, and Assistant Secretary of Penn Octane Corporation inOctober 1996

Served as a director of Penn Octane Corporation from March 1997 until July 2004

From 1987 to 1992, served as Controller/Director of Financial Analysis for Brooke Management Inc., the companywhich provided corporate management services to Brooke Group Ltd. (BGL), a NYSE publicly held company withconsolidated revenues of over $1 billion and controlled several subsidiaries worldwide. BGL was initially formed as aspecialty LBO company with $300 million of initial funding to pursue acquisitions

2007 - Year of Transformation

Rio Vista Energy Partners L.P. ("Rio Vista", "RVEP" or "the Partnership") has recently undergonesignificant changes to better position the Partnership for stable cash flow and distribution growth

Single focus business -principally engaged in thepurchase, transportation and saleof liquefied petroleum gas("LPG")

Slow growth and unstable cashflows

Relatively high administrative andlegal costs

Exploration and production andterminalling and transportationbusinesses provide attractiveMLP growth platform

Stable and diversified cash flows

Experienced and focusedleadership

Rio Vista Pre-2007

Rio Vista Today

Historical

Current Businesses

LPG

Terminalling/Transportation

Exploration &Production

Regional Enterprises, Inc.("Regional", formerly"Regional Enterprizes,Inc.")

Primary business includes:

Receipt of bulk chemicalsand petroleum productsfrom ships, barges and railinto its storage tanks ortrans-loading into tankertrailers. Based inHopewell, Virginia

Mid-Atlantic region focus

Trans-loading from railcars to tanker trailers ofsimilar products at theJohnson City, Tennesseerail site

Acquisition closed in July2007 at a purchase priceof $9.0 million

Rio Vista GO LLC ("RioVista GO", formerlyGO LLC)

Oil and gas pipelinebusiness located inPittsburg and Haskellcounties in Oklahoma

Acquisition closed inNovember 2007 at apurchase price of $4.0million

Rio Vista Penny LLC ("RioVista Penny", formerlyGM Oil Properties, Inc.and Penny PetroleumCorporation)

Oil and gas propertieslocated in McIntosh,Pittsburg and Haskellcounties in Oklahoma,including 100.0% interestin MV Pipeline Company

LTM production (9/30/07)= 0.5 Bcfe

Acquisition closed inNovember 2007 at a totalpurchase price of $26.4million

2P (proved plus probablereserves) purchasemultiple of approximately$0.44/Mcfe(1)

Principally engaged in thepurchase, transportationand sale of LPG

Owned and operated anLPG terminal facility inMatamoros, Mexico andapproximately 23 miles ofpipelines which connect theMatamoros terminal facilityto an LPG terminal facility inBrownsville, Texas

Transported LPGexclusively forTransMontaigne

Sale to TransMontaigneclosed in December 2007for $10.8 million

Gathering

Overview of Rio Vista

(1) Source: Independent engineer reserve reports for G.M. Oil Properties, Inc. and Penny Petroleum Corporation ("The Reserve Reports") dated August 1, 2007. AssumesNYMEX strip pricing as of August 1, 2007.

Rio Vista Asset Map

Oil & Gas Assets

Regional

Entered exploration and production and terminalling andtransportation businesses

Acquired three privately held, related companies in eastcentral Oklahoma on November 20, 2007: GM Oil Properties,Inc., Penny Petroleum Corporation and GO LLC

Purchased Regional Enterprizes, Inc. on July 27, 2007

Exit from legacy LPG business

The Partnership closed the sale of its remaining LPG businessto TransMontaigne on December 31, 2007

Recent Developments

(1) Does not include transaction fees and expenses.

Oklahoma Properties

Paid all outstanding distribution arrearages in 2007

Distribution of $0.25 per unit paid on February 14, 2008

Issued $4.0 million of Rio Vista common units to Standard General and others on November 30,2007(1)

Leadership change

Appointment of Douglas Manner as Chairman of the Board of Managers of Rio Vista GP LLC

Current Organizational Structure

Rio Vista

Operating

Partnership L.P

..

Rio Vista GP

LLC

Rio Vista Energy

Partners L.P.

Rio Vista E&P

LLC

Regional Enterprises,

Inc.

Rio Vista

Operating

GP

LLC

Rio Vista

ECO LLC

Rio Vista

GO LLC

Rio Vista

Penny LLC

GO LLC

MV

Pipeline

Company

2% and IDRs

98%

Limited

Partners

Rio VistaOperatingLLC

Secure additional funding in amounts sufficient to meet desired development strategy for existingexploration and production asset base

Expand exploration and production asset base through accretive acquisitions with long-livedreserves

Leverage expertise of new leadership to optimize existing oil and gas operations

Achieve organic growth through exploitation of numerous low-risk, high-return projectsassociated with exploration and production operations

Improve Regional's operating profits through efficiencies, handling and storage of new productsand expansion of current facilities

Reduce commodity price exposure through hedging program

Rio Vista Business Strategy

New business profile provides attractive growth platform

Numerous development projects associated with acquired Oklahoma oil and gas assets that can berecognized with minimal capital outlay

Prolific play that is in high demand - Woodford / Caney acreage currently receiving high valuations

Entry into oil and gas business provides significant pipeline of acquisition opportunities

Potential to build out additional terminalling assets on undeveloped acreage held by Regional

Stable and diversified cash flows underpinned by long-lived reserve base and Regionalterminalling and transportation business

2P reserve life of 50.4 years based on 2008E production(1)

Small market cap helps facilitate rapid growth

Enhances impact of and competitive positioning for growth opportunities

Experienced and focused leadership

Significant exploration and production and acquisition experience gained through election of DouglasManner as Chairman

Rio Vista Investment Highlights

(1) Source: The Reserve Reports for G.M. Oil Properties, Inc. and Penny Petroleum Corporation dated August 1, 2007. Assumes NYMEX strip pricing as of August 1, 2007.Management estimates 2008 production will be 1.2 Bcf.

Acquired three privately held, related oil and gas companies in East Central Oklahoma on November 20, 2007

Exploration and production acquisitions: GM Oil Properties, Inc. and Penny Petroleum Corporation, now Rio VistaPenny LLC ("Rio Vista Penny"), a wholly-owned subsidiary of Rio Vista

Rio Vista also acquired MV Pipeline Company from GM Oil Properties, Inc. and Penny Petroleum Corporation. It is now a wholly-ownedsubsidiary of Rio Vista Penny

Gathering system and pipeline acquisition: GO LLC, now Rio Vista GO LLC ("Rio Vista GO"), a wholly-ownedsubsidiary of Rio Vista

Total purchase price of $30.4 million

$17.1 million assumption of senior secured debt owed to TCW Asset Management Company ("TCW")

$9.4 million cash payment

$2.0 million for entry into $30.0 million first lien senior credit facility with TCW and to purchase overriding royaltyinterest held by an affiliate of TCW

$1.5 million of Rio Vista common units

$0.5 million short-term convertible note(1)

Purchase was partially funded through $30.0 million credit facility provided by TCW

Initial draw under the facility of $22.1 million

$17.1 million assumption of senior secured debt

$3.0 million cash payment

$2.0 million of TCW fees and third party expenses

8-year amortization starting in December 2008 with fixed interest rate of 10.5%

(1) 7.0% note payable to Gary Moores ("Holder", former owner of Penny Petroleum Corporation) on May 19, 2008. Beginning February 19, 2008, Holder has option to convert theoutstanding principal and interest into Rio Vista common units at a price equal to 90% of the 10-day average closing price as reported by the NASDAQ stock market at the time ofconversion. The conversion option may be exercised on only one occasion and expires on May 19, 2008.

Oklahoma Properties and Related Assets

Transaction Overview

Rio Vista

Acquired approximately 60.5 Bcfe of net proved and probable reserves and approximately 15,000net acres located in McIntosh, Haskell and Pittsburgh Counties in Oklahoma

Combined LTM (9/30/07) production of 0.5 Bcf and current daily production of 1.8 MMcf/d

Rio Vista also acquired a 25% participation agreement on 4,800 acres owned by ConcordeResources with 35 Hartshorne and 4 Booch infield development opportunities

Note: Black dots indicate non-designated operator

Oklahoma Properties and Related Assets

Overview of Assets Acquired

Drilling commenced inJanuary 2008

Located in region populatedwith leading gas producers

Acquired midstream assetsinclude Rio Vista GO's wholly-owned and operated 25-mileBrooken pipeline and Rio VistaPenny's wholly-owned andoperated 40-mile MV Pipeline

Long-lived proved producing properties with significant development potential

Majority interest in 93 operated wells and 16 non-operated wells in the Booch Sand, Hartshorne Coal Bed Methane, George'sFork and Spiro formations

LOE cost of approximately $0.85/Mcf

F&D cost of $0.50/Mcf -$1.00/Mcf

Initial development has been focused on Hartshorne and Booch plays

Hartshorne coal bed methane

Coal thickness contours ranging from a minimum of 2 feet to over 4 feet in select areas

Well potential: 90-100 vertical, 5-10 horizontal, 250 - 900 MMcf per well

Booch sand

Acreage surrounding Lake Eufaula has net sand thickness of 25 feet

Land surrounding the edges and underneath Lake Eufaula has locations with net sand thickness up to 200 feet

Well potential: 5-10 thin, up to 5 thick wells, 800 MMcf - 4 Bcf per well

Significant upside potential in Woodford Shale with additional opportunities in Wapanucka, Union Valley, Cromwell,Jefferson, Mayes, Hunton, Sylvan, Viola and Wilcox plays

Rio Vista has an average working interest of approximately 85%

Proved and Probable Reserves Summary (1)

Oklahoma Properties and Related Assets

E&P Assets Acquired

(1) Source: The Reserve Reports, based on NYMEX strip pricing as of August 1, 2007.

Oklahoma Properties and Related Assets

2008 E&P Development Plan

Rio Vista intends to drill 52 wells in 2008

114 wells are included in the 2008/2009 outside consultants Reserve Reports

Of the 114 wells identified in the Reserve Reports, 51 wells are on the 2008 drilling schedule

Includes horizontal and vertical wells in the Booch Sand and Hartshorne Coal Bed Methane formations

1 deep well is on the 2008 drilling schedule that is not included in the Reserve Reports

2008E total capex of over $11 million expected to be funded from new debt / equity sources

The remaining 63 undeveloped locations reflected in the Reserve Reports are scheduled to bedrilled in 2009 based on available capital

Average vertical well cost is $170,000 and average horizontal well cost is $600,000

Oklahoma Properties and Related Assets

Midstream Assets Acquired

MV Pipeline

Gathers natural gas from leases in the Texanna area north of Lake Eufaula and delivers to the Oneokintrastate pipeline in McIntosh County

40 miles of Class I pipelines, a low-pressure gas gathering system and a 3,000 hp centralcompressor station with capacity of 50 MMcf/d

Originally constructed in 1984, upgraded in 1998 and added 2 new compressors in 2006

Brooken Pipeline

Gathers natural gas from several properties located in Haskell and Pittsburg counties

Originally constructed in 1992 and consists of approximately 25 miles of pipeline

Capacity of 10 MMcf/d

Current total pipeline throughput of approximately 2.0 MMcf/d

Current third-party throughput of approximately 0.6 MMcf/d

Principal business includes storage, transportation and railcar transloading of bulk liquids,including chemical and petroleum products

Located on the James River in Hopewell, Virginia

Receives bulk chemicals and petroleum products from ships and barges (into approximately 10.3million gallons of available storage) and product from a rail spur capable of receiving 14 rail cars atone time for transloading of chemical and petroleum liquids for delivery throughout the mid-Atlantic

34 years of operating history

Total purchase price of $9.0 million

$8.0 million cash

Funded with a $5.0 million one-year note and existing cash

$1.0 million seller note to be paid in four equal semi-annual installments beginning January 2008

Results from period of November 1, 2006 - October 31, 2007

Revenue of $6.7 million

EBITDA of $2.4 million

Acquisition of Regional

Storage facilities include 15 steel tanks and transportation fleetconsists of 30 tractors and 48 tanker trailers

Approximately 90% of Regional's 10.3 million gallons of storagecapacity is currently being utilized

Regional does not take title to products it stores for customers

Regional Overview

Transportation services are short-haul in nature, approximately 85% of deliveries are madewithin a 150-mile radius of the Hopewell terminal

Specialized tanker trailers are capable of handling hazardous materials allowing Regional todemand a premium fee

2007 average driver hour efficiency rate was 79.1%

Driver turnover rate is approximately 18%, compared to the industry average of 37%

Current "safestat" as determined by the D.O.T. is 14.6, which is lower than competitor average ofapproximately 35.3

Transloading facilities at Hopewell terminal and in Johnson City, Tennessee

Open rail access to the Norfolk Southern and CSX rail lines offers competitive rail economics andflexibility for customers

Major Contracts

Asphalt storage and handling contract that runs through October 2012 with annual fee of over$500,000

Required to provide minimum annual throughput of 610,000 barrels per year, with additional volumes paid on aper barrel basis

#2 oil storage agreement that renews annually with annual storage fee of approximately $300,000plus product transportation fee calculated on a per gallon basis

Fuel oil storage and transportation agreement that runs through February 2013 with annual storagefee of over $300,000 plus product transportation fee

Required to provide minimum annual throughput of 35,000 tons per year, with additional volumes paid on a perton basis

The remainder of Regional's cash flow comes primarily from transportation fees

Regional Customer Overview

Regional Expansion Opportunities

Regional controls 2.25 acres of undeveloped acreage at its Hopewell facility which couldaccommodate up to an additional 4.2 million gallons of storage capacity

Estimated capital cost is approximately $375,000

Contemplating a project that would more than double current rail siding capacity at Hopewell

Regional qualifies as a small business contractor and vendor capable of storing, transporting andsupplying bulk chemical and petroleum products on behalf of U.S. government agencies

Regional intends to seek contracts with the Department of Defense and the Defense Energy SupportCenter based on its proximity to multiple military bases

Potential to handle additional bulk products at Hopewell facility such as coal, limestone, wastewood, bio fuels and fly ash

Exploring opportunities at Johnson City facility to handle and transport additional chemicals

Financial Summary

($ in millions)

Rio Vista Stand-Alone Financial Summary (1)(2)

Based on Management estimates at price of $6.51/Mcf. Assumed Rio Vista PDP, PDNP, PDBP and PUD success factors of 100%, 100%, 100% and 75%, respectively. Assumes PDPs 90% hedged at NYMEXstrip prices as of January 14, 2008.

Assumes Rio Vista will be successful in securing additional financing in an amount sufficient to fund estimated Capex and other working capital requirements.

Risk Management Policy

Rio Vista intends to use a high level of hedging to mitigate commodity price volatility andmaintain cash flow and distribution stability

Up to 90% of proved developed production for up to five years

Utilize swaps for majority of hedges but may consider utilizing costless collars as well

Existing hedging program

A significant percentage of 2008-2010 production will be hedged

Current hedges:

February 2008 - March 2008: ~0.8 MMcf/d @ $6.70/Mcf

April 2008 - October 2008: 1.0 MMcf/d @ $6.35/Mcf

November 2008 - March 2009. 1.0 MMcf/d @ $8.61/Mcf

Opportunistically hedge additional volumes through the course of the year and into 2009

Rio Vista will similarly hedge production associated with future acquisitions to protect theeconomics of the transactions

New business profile provides attractive growth platform

Numerous development projects associated with acquired Oklahoma oil and gas assets that can berecognized with minimal capital outlay

Prolific play that is in high demand - Woodford / Caney acreage currently receiving high valuations

Entry into oil and gas business provides significant pipeline of acquisition opportunities

Potential to build out additional terminalling assets on undeveloped acreage held by Regional

Stable and diversified cash flows underpinned by long-lived reserve base and Regionalterminalling and transportation business

2P reserve life of 50.4 years based on 2008E production(1)

Small market cap helps facilitate rapid growth

Enhances impact of and competitive positioning for growth opportunities

Experienced and focused leadership

Significant exploration and production and acquisition experience gained through election of DouglasManner as Chairman

Rio Vista Investment Highlights

(1) Source: The Reserve Reports for G.M. Oil Properties, Inc. and Penny Petroleum Corporation dated August 1, 2007. Assumes NYMEX strip pricing as of August 1, 2007.Management estimates 2008 production will be 1.2 Bcf.

EX-99.23c72843exv99w2.htmEXHIBIT 99.2

Filed by Bowne Pure Compliance

Exhibit99.2

Rio Vista Energy Partners Provides Operational Update
and Provides Company Overview in Regulatory Filing

BROWNSVILLE Rio Vista Energy Partners L.P. (NASDAQ: RVEP), an energy services master limitedpartnership focused on the development of oil and gas properties in Oklahoma and the terminallingand transportation of bulk chemical and petroleum products in Virginia, today announced that it hasfiled a presentation regarding the Companys recent acquisitions and business operations in aregulatory filing made with the Securities and Exchange Commission on Form 8-K. Rio Vista intendsto make this presentation available on its website in the near future (www.riovistaenergy.com).

In addition, the Company today provided an interim operations update.

Management Comments

Ian Bothwell, Rio Vistas Acting Chief Executive Officer said, Good progress is being made in boththe development of the recently acquired oil and gas assets in Oklahoma and the expansion of newcontracts and growth opportunities in our terminalling and transportation business in Virginia. Anumber of projects on our Oklahoma assets are well under way, including infrastructure improvementsand additions, existing well tie-ins, workovers and new drilling. A large drilling program iscurrently being organized for 2008 to continue to develop both the shallow Booch sand and theHartshorne Coal. We are anticipating a significant increase in our production from these assets asa result of this activity. In addition, we have been actively pursuing new contracts and growthopportunities for our Virginia operations and continue to be excited about the revenue growthanticipated from this activity. We continue to evaluate new assets for acquisition and lookforward to success in this area much like we experienced in 2007.

Operations Update

Oklahoma

A pipeline was laid to tie an existing well, the Groseclose 2V-17 (100% WorkingInterest), adding 100 mcfd of gross production.

A pipeline was laid in the Brooken Field to bypass an existing pipeline therebyreducing back pressure on the area. Additionally, this new interconnection has decreasedRio Vistas transportation cost in the Brooken Field.

Rio Vista Operating LLC has taken over operations of the Oklahoma producing properties.

Concorde Resources has recently drilled a successful coal bed methane well (Chaffin1-26) on joint acreage with Rio Vista (Working Interest 25%). The well has been completedand is currently testing.

The Belt 2V-24 (Working Interest 34%) has been deepened and logged in the SavannahSand. The well has been frac stimulated and tested. The gas pipeline interconnectionwill be completed during April2008.

The Cannon 1-31 (deep test in the Crouch Field) has been drilled and cased. Openholelogs confirm the existence of multiple productive zones. Completion of this well began inMarch.

The Donna 1 (vertical Hartshorne Coal in the Brooken Field) has been drilled and cased.The completion of this well will begin in early April2008. Rio Vista will have an 80%Working Interest in this well.

The Tom 1 (vertical Hartshorne Coal in the Brooken Field) has been drilled and cased.The well has also been perforated and is currently being tested. Rio Vista will have an80% Working Interest in this well.

The ACE #2-36 (horizontal Hartshorne Coal in the Canadian Field) will spud in earlyApril. Rio Vista has a 51% Working Interest in this well.

Regional

Recently contracted with an existing customer for additional terminalling andtransportation. The contract term is for 5years and is expected to provide increases inboth terminalling and hauling revenues.

Recently contracted with other customers for transportation services. Contracts rangefrom 1year to 2years and are renewable thereafter. Contracts are expected to provideincreases in both terminalling and hauling revenues.

Recently registered with the US Government Central Contractor data base with status asa small business contractor and vendor capable of storing and hauling bulk chemical andpetroleum products. Such registration allows Regional to bid for government contractswithin the Department of Defense and the Defense Energy Support Center and any otherapplicable agency. Regionals operations are strategically located near many significantmilitary facilities (army and navy). Regional expects that this registration will provideopportunities for significant additional revenues.

Since ownership of Regional, Regionals plant and hauling operations have beenoperating more efficiently, with increased driver utilization during the forth quarter of2007.

Regionals current Safestat number is 14.6 which is considerably lower than theaverage of Regionals competitors of approximately 35.3. Safestat is a numericalgrading system that is administered by the US Department of Transportation. It considersfactors such as roadside DOT inspections, traffic citations, etc. and is relied upon byinsurance companies, state police, DOT, competitors, and potential customers in gradingRegional.

About Rio Vista Energy Partners L.P.

Rio Vista is a master limited partnership focused primarily on acquiring and developing oil and gasexploration, production and transportation assets. Through its subsidiaries, Rio Vista currentlyowns certain leasehold interests of oil and gas producing properties and associated pipelinegathering systems in East Central Oklahoma. Rio Vista is also engaged in liquid bulk storage,transloading and transportation of chemicals and petroleum products through its assets andoperations in Hopewell, Virginia. Rio Vista seeks to grow primarily through the acquisition ofqualified oil and gas assets. Penn Octane Corporation (OTCBB: POCC) owns 75% of Rio Vista GP LLC,the general partner of Rio Vista.

Forward-Looking Statements

Certain of the statements in this news release are forward-looking statements, including statementsregarding the operation status of Rio Vistas oil and gas properties, including future productionof oil and gas from Rio Vistas properties in East Central Oklahoma and the liquid bulk storage,transloading and transportation of bulk chemicals and petroleum business in Hopewell, Virginia.Although these statements reflect Rio Vistas beliefs, they are subject to uncertainties and risksthat could cause actual results to differ materially from expectations. The acquisition of theproperties in East Central Oklahoma may not prove successful and has substantially increased RioVistas and its subsidiaries indebtedness and contingent liabilities, and may present integrationdifficulties. Continuation and expansion of production may require unforeseen capital investment.Future production may be lower than anticipated, and actual natural gas reserves may prove lowerthan estimated. If Rio Vista does not receive sufficient revenues from the use of its assets, RioVista would suffer material adverse consequences to its business, resulting in reduced cashavailable for distributions. Rio Vistas credit facility with TCW prohibits distributions by RioVistas Oklahoma subsidiaries during the first 12months of the credit facility and limits thosedistributions to 75% of defined available cash flow thereafter. As a result, Rio Vista may nothave sufficient available cash to pay minimum quarterly distributions. In addition, Rio Vista maynot distribute sufficient cash to meet the tax obligations of unitholders associated with theownership of common units. If Rio Vista does not have sufficient capital resources for acquisitionsor opportunities for expansion, Rio Vistas growth will be limited. Rio Vista may be unable tocomplete future acquisitions of qualified oil and gas assets or other transactions and, even ifcompleted, acquisitions may not prove successful. Additional information regarding risks affectingRio Vistas business may be found in Rio Vistas most recent reports on Form 8-K, Form 10-Q andForm 10-K and its registration statement on Form S-3 filedwith the Securities and Exchange Commission on February13, 2008, and in Penn Octane Corporationsmost recent reports on Form 8-K, Form10 Q and Form 10-K filed with the Securities and ExchangeCommission.

Contact:
Rio Vista Energy Partners L.P.
Ian T. Bothwell, 760-772-9080

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