Alerian Capital Management Announces Addition Of Valero GP Holdings, LLC (NYSE: VEH) To the Alerian MLP Index

Valero GP Holdings, LLC (NYSE: VEH) has a market capitalization of$850 million and owns general partner and limited partner interests,and the incentive distribution rights of Valero L.P. (NYSE: VLI), oneof the nation's largest independent operators of petroleum productterminals and petroleum liquids pipelines. Valero L.P.'s refinedproduct terminals, petroleum and specialty liquids storage andterminaling operations, and crude oil storage tank facilities arepredominantly located on waterways that are easily accessible by bargeor vessel. Altogether, these facilities have approximately 77 millionbarrels of storage capacity. In addition, Valero L.P.'s 9,243 miles ofcrude oil and refined products pipeline systems serve growing marketsin the Mid-Continent, Southwest and Texas-Mexico border regions of theUnited States.

At the close of business on September 15, 2006, Valero GPHoldings, LLC (NYSE: VEH) will be added to the Alerian MLP Index andRio Vista Energy Partners L.P. (NASDAQ: RVEP) will be removed.

In accordance with the existing index methodology, the index's 50constituents will be rebalanced on a float-adjusted marketcapitalization-weighted basis.

Constituent additions to and deletions from the Alerian MLP Indexwill be announced in advance and do not reflect an opinion by AlerianCapital Management LLC on the investment merits of the respectivesecurities.

About the Alerian MLP Index

The Alerian MLP Index is a composite of the 50 most prominentenergy master limited partnerships and is calculated by Standard &Poor's using a float-adjusted market capitalization methodology,providing an unbiased, comprehensive benchmark for the performance ofthis emerging asset class. The index is disseminated real-time on aprice return basis (NYSE: AMZ) and the corresponding total returnindex is disseminated daily through ticker AMZX. Relevant constituentdata points such as market capitalization, daily dividends, anddividend yield are disseminated daily.

About Alerian Capital Management

Alerian is a registered investment advisor that manages portfoliosexclusively focused on midstream energy Master Limited Partnerships.The company focuses on fundamental analysis in this emerging assetclass, combining its bottoms-up private equity philosophy with riskmanagement programs designed to preserve capital and mitigateportfolio volatility. Investing in both the private and public equitymarkets, the company concentrates on maximizing absolute total returnson a risk-adjusted basis. For more information, visit www.alerian.com.

About Valero GP Holdings, LLC

Valero GP Holdings, LLC owns the general partner of and a 21.4percent limited partner interest in Valero L.P. A publicly tradedlimited partnership based in San Antonio, Texas. Valero L.P. operatesindependent terminals and petroleum liquids pipeline systems in theUnited States and also operates terminals in the Netherlands Antilles,Canada, Mexico, the Netherlands, and the United Kingdom. Thepartnership's assets include 9,243 miles of pipeline, 88 terminalfacilities, and 60 crude oil storage tanks with an aggregate storagecapacity of approximately 77 million barrels. For more information onValero GP Holdings, LLC, please visit www.valerogpholdings.com. Formore information on Valero L.P., please visit www.valerolp.com.

About the New York Stock Exchange

NYSE Group, Inc. (NYSE:NYX) operates two securities exchanges: theNew York Stock Exchange (the "NYSE") and NYSE Arca (formerly known asthe Archipelago Exchange, or ArcaEx(R), and the Pacific Exchange).NYSE Group is a leading provider of securities listing, trading, andmarket data products and services. The NYSE is the world's largest andmost liquid cash equities exchange. The NYSE provides a reliable,orderly, liquid, and efficient marketplace where investors buy andsell listed companies' common stock and other securities. Our listedoperating companies represent a total global market capitalization ofover $22.9 trillion. In the first quarter 2006, on an average tradingday, over 1.7 billion shares, valued at over $65 billion, were tradedon the NYSE. For more information on NYSE Group, go to:http://www.nyse.com/

About Standard & Poor's

Standard & Poor's, a division of The McGraw-Hill Companies(NYSE:MHP), is the world's foremost provider of independent creditratings, indices, risk evaluation, investment research and data. Withapproximately 6,300 employees located in 21 countries and markets,Standard & Poor's is an essential part of the world's financialinfrastructure and has played a leading role for more than 140 yearsin providing investors with the independent benchmarks they need tofeel more confident about their investment and financial decisions.For more information, visit http://www.standardandpoors.com.