Document G5O5MGNwVRMz8Mx1M7zGrZ0jr

WRG 002319 GRACE DRAFT Mr. John T. Collins, Architect Mr. Leonard A. Collins, Architect P. 0. Box 112 Biloxi, MS 39533 Zonolite Construction Products Division W.R. Groce & Co. 62 Whittemore Avenue Combridge, Moss. 02140 16171 876-1400 February 15, 1983 0 PLAINTIFF'S EXHIBIT \ WRG-755 . Re: ZONOLITE Acoustical Plaster Products Dear Mr. Collins: This is in response to your recent inquiry to our Mr. Steve Barter con cerning Zonolite Acoustical Plaster Products. Please be advised that these products were a blend of lightweight vermiculite aggregate, air entraining agents, preservatives and corrosion inhibitors in a gypsum or bentonite binder. As manufactured, asbestos fibers were added to the products. The asbestos content was approximately 12-182 by weight. Sales of the products were discontinued in 1972. When evaluating a future course of action with regard to materials such as these, consideration needs to be made of the following parameters: 1. The age of the asbestos-bearing materials. 2. The physical condition of the in-place material. 3. The physical disturbance which has occurred or may occur due to accessibility. Because of the "setting" characteristics of these plaster materials, we believe that Che asbestos fibers are encapsulated in the matrix. This conclusion assumes that the material is undisturbed and has suffered no in-place damage. If the material has been subjected to external forces which have left the surface sifting and flaking, consideration should be given to either (1) removal of the material, or (2) overspraying and sealing of the surface. Enclosed is a list of sealers tested to meet EPA regulations. Of course, the overall concern is possible exposure to respirable asbestos fibers which may be released from the material. Only on-site, breathing sone determinations will determine the exposure concentrations. Air monitoring should b done in accordance with OSHA regulations. 000749 Towards understanding this situation further, we have enclosed a copy of the EPS guidance document "Asbestos Containing Materials in School Buildings". This document provides much of the background on the asbestos problem in this country along with general guidelines on handling such problems. Please review the enclosed and get back to me if you have any questions or require clarification on a particular point. Sincerely, RTF/jdg Enclosure Robert T. Frohlich Marketing Manager Roof Deck Products 000750