1 EXHIBIT 10.4 AMENDMENT TO KEY EMPLOYEE SEVERANCE AGREEMENTS WHEREAS, the Board of Directors of Presidio Oil Company ("Presidio") and the Board of Directors of Presidio Exploration, Inc. ("Presidio Exploration") have approved the Key Employee Severance Agreements (the "Agreements") dated as of July 25, 1995 between Presidio and George P. Giard, Jr. ("Giard") and Robert L. Smith ("Smith"), (together, the "Executives"); and WHEREAS, it is recommended that special recognition is appropriate for obtaining the highest possible sales value for Presidio or Presidio Exploration's assets, which will require special dedication and efforts on the part of the Executives. It is hereby agreed that the Agreements, notwithstanding anything to the contrary therein, shall be amended such that the Rights and Benefits upon Termination provided in Section 3 of the Agreements in respect of each of the Executives will be based upon the following number of months of severance pay, subject to the limitation of Section 6 of the Agreements, as follows: VALUE RECEIVED (1) # OF MONTHS SEVERANCE --------------------- ($MM) GIARD SMITH ------------------------- ----- ----- over 190 20 19 over 195 21 20 over 200 22 21 over 205 23 22 over 210 24 23 over 215 25 24 over 220 26 25 over 225 27 26 over 230 28 27 over 235 29 28 over 240 30 29 over 245 30 30 (1) "Value Received" refers to the consideration (the "Consideration") received in any offer accepted by Presidio and/or Presidio Exploration in respect of the sale of the oil, gas and related assets (the "Assets") of Presidio Exploration (or a similar transaction relating to the Assets such as a merger involving Presidio and/or Presidio Exploration) and which further results in either an Asset Acquisition as defined in Section 2 (c) (i) of the Agreements or in a Change of Control as defined in Section 2 (c) (ii) (D) of the Agreements. The Consideration may consist of cash and/or securities and shall include both (a) the total amount of net consideration available to the holders of Presidio's bank and public debt and its stockholders and (b) the total amount of net liabilities assumed by the purchaser of the Assets, including both Presidio's balance sheet and off-balance sheet liabilities. -1- 2 IN WITNESS WHEREOF, the parties have executed this Amendment to Key Employee Severance Agreements on August 16, 1995 but effective as of July 25, 1995. PRESIDIO EXPLORATION, INC. By: /s/ Judson Williams ------------------------------ Judson Williams, Treasurer EXECUTIVES By: /s/ George P. Giard, Jr. ------------------------------- George P. Giard, Jr. By: /s/ Robert L. Smith ------------------------------- Robert L. Smith -2-