Document KRvp303QMp7DaQXjNYoVj5qaQ

IV.R. GRACE & CC PrOFI'JFO MAR 14 1983 HANTA AHA Zanoiite Comlrvction Product! Oiv.i.on W r Groce & Co 67 Whirremore A.enue Combridge. Mon. 0?l0 (617) 876-1400 r.le, 6?.l417GRACECO Cam March 8, 1983 Mr. Thomas F. Hall Ceneral Manager Holiday Inn Union Square 480 Sutter Screec San Francisco, CA 94108 Re: MonokoceO Cementitious Fireproofing Dear Mr. Hall: This is in response to your letter of February 22, 1983 to our Mr. John Raggio concerning the MONOKOTE Fireproofing material used on the Holiday Inn Union Square Hotel. It is our belief that the product used ac your facility was MONOKOTE MK-3, applied in 1970. MONOKOTE MK-3 Fireproofing, as manufactured, vas a blend of lighcveight vermieulite aggregate, gypsum binder, asbestos fibers and air entraining agents. The product contained approximately 13Z by weight of the asbestos material. When evaluating in-place materials of this type, consideration should be given to the type of produce used, the physical condition of the in-place material and the accessibility of the material eo physical damage and dusting. The MONOKOTE produce used on your building should not be confused wich chose fireproofing produces which were formulated wich higher asbescos con tents (up to SOX) and were air sprayed to form a low density, fluffy, lighdy bound mat. By contrase. Grace's MONOKOTE fireproofing (MK-3) was a mill-mixed formulation which was combined wich water on the jobsice to pro duce a cementitious plaster type mixture which sec into a product of higher density, was more tightly bonded to the substrace, and was a more durable and harder product. Because of the "secclng'' characteristics of this plaster type fire proofing product, we believe that the asbescos fibers are encapsulated in the matrix, and therefore, are not subject to release into the environment. This conclusion assumes chat the material is undisturbed and has suffered no in-place damage. llbii) -i- Uk understand that Mr. Xa<>io li.is already been in concji't with you vjj telephone. If you should have any further questions nr need additional in formation on chis matter, please let us know. Sincerely RTF/jdg CC: J. Ragglo BCC: S. H. Ahern R. J. Bectacchi T. ?. Felt R. A. Merther R. T. Frohlich