To: OSHA File Interoffice Communication From: Date: Subject: Randy Istre April 12, 1990 Determination of 95% Confidence Limits as Required by OSHA VIS1A The analysis intervals for VCM at the 95% confidence level set forth by OSHA are shown below.

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Vista Chemical Company 900 Threodneedle Houston, Texas 77079 (713) 588-3000 P.O.

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HSE Health & Safety Executive Health and Safety Executive Occupational Medicine and Hygiene Laboratory MDHS 71 Methods for the Determination of Hazardous Substances March 1991 Analytical quality in workplace air monitoring INTRODUCTION 1 Under the Health and Safety at Work etc Act 1974 there is a general requirement for employers to protect the health of their workforce, but with the introduction of the Control of Substances Hazardous to Health (COSHH) Regulations the duties of employers are stated more clearly and in more detail.

The America Ceramic Society February 15,1993 I hereby certify that the attached copies of American Ceramic Society Bulletin, Volume 28,1949, are true and accurate copies, which are maintained in the normal course of business at the American Ceramic Society, 735 Ceramic Place, Westerville, Ohio 43081.