Filed by Plains All American Pipeline, L.P. (1-14569)
Pursuant to Rule 425 under the Securities Act of 1933

Subject Company:  Pacific Energy Partners, L.P. (1-31345)
Commission File No:  333-135712

Contacts:	Plains All American Pipeline, L.P.
	Phillip D. Kramer	Brad A. Thielemann
	Executive Vice President and CFO	Manager, Special Projects
	713/646-4560 — 800/564-3036	713/646-4222 — 800/564-3036
	Pacific Energy Partners, L.P.
	Gerry Tywoniuk	Jennifer S. Shigei
	Senior Vice President and CFO	Manager, Investor Relations
	562/728-2890	562/728-2871

FOR IMMEDIATE RELEASE

Plains All American Pipeline and Pacific Energy
Announce Expiration of HSR Waiting Period

(Houston — August 1, 2006) Plains All American Pipeline, L.P. (NYSE: PAA) and Pacific Energy Partners, L.P. (NYSE: PPX) announced today that the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, for their proposed merger expired at 11:59 p.m. Eastern time on July 31, 2006.

The expiration of the Hart-Scott-Rodino waiting period satisfies one of the closing conditions contained in the merger agreement, dated June 11, 2006, between Plains All American and Pacific Energy. Plains All American has also received a “no issue” letter from the Canadian Competition Bureau and the accompanying waiting period under the Competition Act has expired. The completion of the transaction remains subject to the approval of the unitholders of Plains All American and Pacific Energy as well as approvals of certain state utility commissions and the Investment Review Division of Industry Canada.  Plains All American and Pacific Energy have submitted the required filings and anticipate closing the transaction near the end of 2006.

Plains All American Pipeline, L.P. is engaged in interstate and intrastate crude oil transportation and crude oil gathering, marketing, terminalling and storage, as well as the marketing and storage of liquefied petroleum gas and other petroleum products, in the United States and Canada. Through its 50% ownership in PAA/Vulcan Gas Storage LLC, the Partnership is also engaged in the development and operation of natural gas storage facilities. The Partnership’s common units are traded on the New York Stock Exchange under the symbol “PAA.” The Partnership is headquartered in Houston, Texas.

Pacific Energy Partners, L.P. is a master limited partnership headquartered in Long Beach, California.  Pacific Energy is engaged principally in the business of gathering, transporting, storing and distributing crude oil, refined products and other related products.  Pacific Energy generates revenues by transporting such commodities on its pipelines, by leasing capacity in its storage facilities and by providing other terminalling services.  Pacific Energy also buys and sells crude oil, activities that are generally complementary to its crude oil operations.  Pacific Energy conducts its business through two business units, the West Coast Business Unit, which includes activities in California and the Philadelphia, PA area, and the Rocky Mountain Business Unit, which includes activities in five Rocky Mountain states and Alberta, Canada.

Investor Notice

Plains All American Pipeline, L.P. has filed with the Securities and Exchange Commission a registration statement on Form S-4 (as the same may be supplemented or amended, Registration No. 333-135712) containing a preliminary joint proxy statement/prospectus of Plains All American Pipeline, L.P. and Pacific Energy Partners, L.P. and other documents in relation to this transaction. Investors and security holders are urged to read carefully these documents when they become available because they will contain important information regarding Plains All American Pipeline, L.P., Pacific Energy Partners, L.P. and the merger. A definitive joint proxy statement/prospectus will (when finalized) be sent to security holders of Plains All American Pipeline, L.P. and Pacific Energy Partners, L.P. seeking their approval of the transactions contemplated by the merger agreement. Investors and security holders may obtain a free copy of the definitive joint proxy statement/prospectus (when it is available) and other documents containing information about Plains All American Pipeline, L.P. and Pacific Energy Partners, L.P., without charge, at the SEC’s website at www.sec.gov. Copies of the definitive joint proxy statement/prospectus and the SEC filings that will be incorporated by reference in the definitive joint proxy statement/prospectus may also be obtained free of charge by directing a request to the respective partnerships as follows: Information regarding Plains All American Pipeline can be obtained by contacting its investor relations department at 713-646-4100 or by accessing its website at www.paalp.com, and information regarding Pacific Energy Partners can be obtained by contacting its investor relations department at 562-728-2871 or by accessing its website at www.PacificEnergy.com.

Plains All American Pipeline, L.P. and Pacific Energy Partners, L.P. and the officers and directors of the respective general partners of Plains All American Pipeline, L.P. and Pacific Energy Partners, L.P. may be deemed to be participants in the solicitation of proxies from their security holders. Information about these persons can be found in Plains All American Pipeline, L.P.’s and Pacific Energy Partners, L.P.’s respective Annual Reports on Form 10-K and Form 10-K/A filed with the SEC, and additional information about such persons may be obtained from the joint proxy statement/prospectus when it becomes available.

This document shall not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of the Securities Act of 1933, as amended.

Cautionary Statement Regarding Forward-Looking Statements

Certain statements made herein are forward-looking statements under the Private Securities Litigation Reform Act of 1995. They include statements regarding the timing of the business combination transaction involving Plains All American and Pacific Energy. These statements are based on the current expectations and estimates of the management of Plains All American and Pacific Energy and their general partners; actual results may differ materially due to certain risks and uncertainties. Although Plains All American, Pacific Energy and their general partners believe that such expectations reflected in such forward-looking statements are reasonable, they cannot give assurances that such expectations will prove to be correct.  For instance, although Plains All American and Pacific Energy have signed a merger agreement, there is no assurance that they will complete the proposed merger. The merger agreement will terminate if Plains All American and Pacific Energy do not receive the necessary approval of their unitholders, and also may be terminated if the parties fail to satisfy conditions to closing. Other risks and uncertainties that may affect actual results are discussed in Plains All American’s and Pacific Energy’s filings with the Securities and Exchange Commission, including their Annual Reports on Form 10-K and Form 10-K/A for the year ended December 31, 2005 and Registration Statement on Form S-4 (No. 333-135712).

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