Document JrR2ERBy37817M8O0qGn9rvO

Vista Chemical Company 900 Threodneedle Houston, Texas 77079 (713) 588-3000 P.O. Box 19029 Houston, Texas 77224 Fax (713) 588-3236 December 7, 1989 TGG: JCL ERT- MJH: Meriara Wiggins Lewis TS-794 Room 611 East Tower US EPA 401 M Street S.W. Washington, D, C. 20460 Dear Meriam: This letter is to confirm our discussion of December 5, 1989, regarding the conditions of use for an import chemical not on the inventory. Based on the conditions described below, you indicated that we could import and use the chemical substance under applicable R & D exemption procedures. Vista plans to research the applicability of a chemical substance to clean the walls of polyvinyl chloride reactors between the manufacture of batches to be used for commercial sale. This substance does not contact the product by design, but there is some potential that trace amounts may occur in the finished product. The chemical substance to be researched will be imported and is not on the inventory. We plan to use one 55-gallon drum in our initial research effort. Based on the conditions above, you advised that Vista could do this research under R & D procedures, applicable import certification procedures will also be followed. I appreciate your timely answer on this question. You can contact me at 713-588-3445 if you have any questions on the above. Sincerely, Environmental Quality Manager dlj bcc: Eric Meyer, W. L. McClain, Frank Jeanson-Aber VVV 000007235