Document pmG5Dq9v0dm7MqG1R4D2kvDz7

FRQM5U1STPI MFG HOUSTON Vista Chemical Company ABD00062579 TQ:UINYL INSTITUTE 900 Thraodnaadb Houston, Tanas 77079 (713) 588-3000 JUL 5. 1990 11:44AM 0033 P.01 P.O.&ox 19029 Houston, Texas 77224 Fox (713) 5884236 July 5, 1990 Meredith Scheck The Vinyl Institute 155 Route 66 West Wayne, NJ 07470 VISIA Dear Meredith, We are being told by the State of Mississippi the unit risk factor for VCM is 4.2 x 10'5/micrgra/m3* Multiplication of the unit risk factor by the fcncellne concentration provides a worst case estimate of risk from a particular facility. As state air toxic programs become prevalent, the unit risk factor will bo more of an issue. 1 am Interested in others' experience or knowledge on what factor is being used to estimate risk from their facilities. If you could poll the members I would appreciate it. Sincerely, Ledvlna cc: FGJ