Letter Agreement Amending Measurement Terms under CCC Product Sale and Purchase Agreement between Warren Petroleum Company, L.P. and Chevron Chemical Company

Summary

Warren Petroleum Company, L.P. and Chevron Chemical Company agree to amend their existing Product Sale and Purchase Agreement regarding how product quantities are measured. All products sold to Chevron Chemical will now be measured by mass, with invoice quantities converted to gallons using industry standards. This change maintains the measurement practices used before the merger of Warren Petroleum and NGC Corporation. Both parties have signed this letter to confirm their mutual agreement to the new measurement method.

EX-10.11(A) 11 a2077094zex-10_11a.txt EXHIBIT 10.11(A) Exhibit 10.11(a) WARREN PETROLEUM COMPANY, LIMITED PARTNERSHIP 13430 NORTHWEST FREEWAY, SUITE 1200 HOUSTON, TEXAS 77040-6095 October 14, 1996 Mr. R. D. Harrison Chevron Chemical Company 1301 McKinney Houston, Texas 77002 RE: CCC Product Sale and Purchase Agreement Article XII, Section 12.1 - Measurement and Analysis Dear Mr. Harrison: Please reference Section 12.1 of the above referenced agreement which addresses measurement techniques for Products that Warren Petroleum Company, Limited Partnership ("Warren LP"), through its affiliate, Warren Gas Liquids, buys and/or sells from and/or to Chevron Chemical Company ("Chevron Chemical"). As written, this section prescribes mass measurement for Ethane and E/P Mix Products and volumetric measurement for other Products. Prior to the combination of NGC Corporation with the Warren Petroleum Company ("Warren") and Natural Gas Business Unit divisions of Chevron U.S.A. Inc., mass measurement was used to measure all Products sold to and/or purchased from Chevron Chemical. It was not intended that the measurement techniques previously used by Warren would change once the merger was completed. Keeping with Warren's prior practice, Warren LP and Chevron Chemical mutually agree that the volume of all Products sold to Chevron Chemical shall be measured on a mass basis. For invoice purposes, the mass quantity shall be converted to a volumetric basis (gallons) per latest applicable API/GPA standards or publications. If you agree with the foregoing, please evidence your agreement by executing both of the originals of this letter enclosed herewith, keep one for your records and return the other to me. For the purpose of this letter agreement, all capitalized terms as used herein shall have the same meanings as set forth in the CCC Product Sale and Purchase Agreement dated effective as of September 1, 1996 entered into between Warren LP and Chevron Chemical. Very truly yours, /s/ Hunter Battle Hunter Battle Director- Liquid Assets AGREED THIS 21 DAY OF OCT, 1996: CHEVRON CHEMICAL COMPANY By: /s/ R. D. Harrison --------------------- R. D. Harrison