Document jBq9XojZRL65Nmno4BGe84Qv5

Vista Chemical Company 900 Threadneedle Houston, Texas 77079 (713) 588-3000 P.O. Box 19029 Houston, Texas 77224 Fax (713) 588-3236 December 13, 1989 TGG'. JCL ERT' MJH: AJ0: RF s Mr. M. Lummis Room 3.1.16 Department of Energy 1 Palace Street London SW1E 5HE Dear Mr. Lummis: I am writing in regard to Vista 0DC Drilling Fluids. Correspondence received from your department in November indicated that all base oils must be retested every 3 years. Would you please advise me on the status of Vista's base oils. Specifically, when will we be required to retest these oils to ensure continued acceptance of their use in UK waters? Thank you in advance for your cooperation. Sincerely, Thomas G. Grumbles, C.I.H. Environmental Quality Manager dlj vvv 00000^296