Document k9RZZyZkq09rN59QZ2236NDGJ

BORDEN CHEMICAL DIVISION OF BORDEN INC March 1, 1982 Mr. Bruce Duncan Self Insurers Management Corporation 60 State Street Boston, MA 02106 Dear Bruce: The following is an explanation of Personnel Monitoring terms used on the enclosed forms: VCM Vinyl" Chloride Monomer TWA (8 hour) Time Weighted Average, calculated average exposure over an 8 hour period 5.6 PPM 5.6 parts per million of VCM for TWA exposure Calibration Readings Before and After - Personnel monitoring pump calibration readings before and after each test Safety Supervisor. KLM:smt Enclosures BOR 007686 0 *11 anta*TFP STREET LEOMINSTER MASS 01453 * TELEPHONE (617) 537 1711