Based on a reserve study provided to the Trust by DeGolyer and MacNaughton, independent petroleum engineers, as of October 31, 2008 future net revenues attributable to the Trust's royalty interests were estimated at $24.2 million. Estimates of proved oil and gas reserves attributable to the Partnership's royalty interest are based on existing economic and operating conditions in effect at October 31, 2008 in order to correspond with distributions to the Trust. Such reserve study also indicates that approximately 40% of the future net revenues from the Royalty Properties are expected to be received by the Trust during the next three years. Solely for purposes of being able to complete the reserve study so that the Trust could file its Form 10-K for the year ended December 31, 2008, DeGolyer and MacNaughton assumed that Eugene Island 339 will not be redeveloped. As such, the reserve study does not include any reserves or values attributable to Eugene Island 339, nor does it include the Trust's percentage share of the total plugging and abandonment costs related to Eugene Island 339, with such costs for 2009 alone estimated to be approximately $61 million. The assumption was made by DeGolyer and MacNaughton because Chevron had not made a decision regarding any redevelopment of Eugene Island 339 and such decision would impact the treatment of Eugene Island 339 for purposes of preparing a reserve study for the Partnership. Because the Trust will terminate in the event estimated future net revenues fall below $2.0 million, it would be possible for the Trust to terminate even though some or all of the Royalty Properties continued to have remaining productive lives. Upon termination of the Trust, the Trustees will sell for cash all of the assets held in the Trust estate and make a final distribution to Unit holders of any funds remaining after all Trust liabilities have been satisfied.