Document MMNmvEjD3ew6oGyGL70KDo9a7

Visto Chemical Company 900 Threodneedle Houston, Texas 77079-2990 (713) 588-3000 P.O. Box 19029 Houston, Texos 77224-9029 Fax (713) 588-3236 June 1, 1993 VIS1A Mr. Bill Black ENSR Consulting and Engineering 3000 Richmond Avenue Houston, TX 77098 Dear Bill: In response to your proposal, ENSR Ref. No.: 3460-A12, and based on our phone discussions, please proceed with the following tasks: 1. Prepare a written review of your review of the A. D. Little and Trithydro Corp. reports on Ceralox, as provided to you by Lynn Zimmerman. 2. Review the available compliance databases for Cerolox compliance issues since 1988. 3. Take other steps as necessary to review Ceralox compliance without visiting the site or agencies. This could include phone calls or dther requests to appropriate agencies. A contractor work order, for work not to exceed $7,500 is attached. Vista is requesting this work be completed by June 15. Sincerely, Thomas G. Grumbles, C.I.H. Manager Safety, Health & Environmental dlj cc: Lynn Zimmerman UEV 000080570 r1