Document nxadJqY1L6qnRGN04xeVZ8pm

AUG ' 1 1989 cc: D. R. Hanaen-Santa Clara W. N. Maddox-C D. H. Bechtold-C R. Burnt Kelly-RKELL E. Wheeler-WHEB ^ August 13. 1969 Mr. M. P. Powell U. 3. Plywood - Chaeplon Papers 1?0 I. Franklin St. Chicago, Illinois 60606 Dear Parker: I eentloned toygu that I had wore specific information about MMiPMt In looking over ay notes X don't have eueh wore to offer than Or. Kelly. If you don't feel that the following Is sufficient, please call either Aust Kelly or liner Wheeler. Monsanto's Manager of ftivironnental Health who gave ee this information. "Somewhat arbltarlly we have said In the past that If Aroelor 1?*8 Is heated above 150* f then neehenleal exhaust ventilation should be provided to remove vapors. This nay or nay not be ccnaervative depending on the concentration of Aroelor in a formulation, the surface ares exposed, the duration of the elevated temperature and the anount of general room ventilation provided. "Sufficient ventilation" is that anount needed to reduce vapor concentrations of Ardelor 12*8 to the Threshold Llnlt value (TLV) of -0.5 nilligraaa per cubic neter of air. The TLV is that anount which workers can Inhale 8 hours a day, 5 days a week for a working lifetime without danger of Injury. This obviously will lead to the question of how the concentration In a workman is determined. Aroelor vapors eannot be measured with staple instruments that can be used for auoh eotmaon work pleee contaminants such as carbon nonoxide1 hydrogen sulfate, many chlorinated hydrocarbon solvents, etc. The measurement of Aroelor vapors requires sampling equipment and techniques that Involve wet ehemlstry analysis In a suitable laboratory. DSM 020302 STLCOPCB4008231 Mr. M. P. Powell - ?- August 13* 1969 "Sufficient ventilation" m also be defined as the amount of air moving over thm scairce of a contaminant (in this caca Aroclor) and Into appropriately dafinad ventilating ayataaa to carry tha vapors outaIda tha working araa. Dapandlng on tha typa and nature or tha ourca tha daslgn of tha vantilating ayatam can ba almpla or complex. In aithar caaa a common house hold situation sarvaa to lllustrata tha point. For example, ona would not try to cnptura and remove tha odor of frying fish or cooking cabbaga in tha araa of tha kltchan ranga by placing a window fan in an upstairs window or attic. Common sansa says to put a hood ovar tha ranga where it la mora economical to swva smaller quantities of air and yat capture tha offending materials. Secondly, it obviously is preferable not to draw the odors through tha raat of tha house. Thla seams so obvious that no ona would expect to find designs of vantilating systsms In Industry that would draw Aroclor vapors across a workroom exposing unnacetsarlly a large number of people and secondly, moving many more cubic feat of air to control tha expoaure than if tha ventilation was applied directly ovar tha source. Unfortunately plant engineers are repeatsdly isapplying exhaust ventilation as indicated in tha example above." Sorry you've had such a hard time getting tha answer you want. Sincerely, GLJ/ls C. Lea Judy Cetlu-Chem Salas OSW 020303 STLCOPCB4008232