A jointly hosted conference call by Chesapeake and PXP management teams to discuss this release has been scheduled for tomorrow, July 2, 2008, at 9:00 a.m. EDT. The telephone number to access the conference call is 913-312-0959 or toll-free

888-254-2827. The passcode for the call is 2424219. We encourage those who would like to participate in the call to dial the access number between 8:50 and 9:00 a.m. EDT. The conference call will also be webcast live on the Internet and can be accessed by going to Chesapeake’s website at www.chk.com and selecting the “News & Events” section or PXP’s website at www.pxp.com and selecting “Presentations / Webcasts” in the Investor Relations section.