Document gx4b6Npr1VvLq5NX742dOO2J

Vista Chemical Company November 27, 1990 Mr. John Wannamaker Dussek-Campbell Fax 1-613-966-1901 900 Threadneedle Houston, Texas 77079 {713) 588-3000 P.O. Box 19029 Houston, Texas 77224 Fax {71 3) 588-3236 TGG: JCL: MO' RP XF::------- VISTA RE: DSL LISTING FOR VISTA N-550 AND N-575 ALKYLATE Vista believes the description below, which is now on the provisional DSL is an appropriate description for vista 550L and 575L. CAS # 67774-74-7; Benzene, C10.13 alkyl derivs. The typical carbon range distribution for these products is as follows: 550L 575L 10 0.3% 10 13.4 11 30.4 '12 29.0 13 24.0 '14 3.0 '15 0.2 < C10 cin cli C17 C13 C14 > C15 0.5 8.0 17.0 25.0 35.0 15.0 0.4 Please note that the above distributions are representative only and may not be exactly what you have received. However, for DSL purposes these ranges should provide enough information to describe the products. As we have discussed, the most appropriate description for these alkylate products depends on how you view the carbon range allowance in a description. In general, the USEPA has accepted the carbon range that best describes at least 80% of the material. If a broad range description is acceptable for the DSL, then an alternate choice to describe these products would be CAS #68648-87-3, Benzene, C10-16 * alky! derivs. Sincerely, Thomas G. Grumbles, C.I.H. Manager Environmental Affairs dlj vvv OOOOll^82