Document mmyNRRnRypdZRrVD8Ox6gwVpk

/ > July 16, 1)75 MX. P. C. NilBU Plant Manegmr FPO - Lindsay Subject* industrial Hygiene survey Report of 2/10-14/75 and Status tetter Noting your general comment on the status letter of July a, 1975. it is not unusual that significant variations in com parative airborne asbestos levels would occur from cae year to tbs next, especially at inadequately vmtilated where control is minimal. Compering the 1974 and 1975 reporta, major variations occurred only at the Bldt Prrfwrn unita during the oollection of short term sample*, the sheet team samples were collected at Blok Preform 19* 1 erne day later than the longer term samples collected c Blok Preform Ho. 2. During the sampling at Blok Preform ho. 2, it was the only machine operating, the following day b*th Preform unite were operating during the collection of the hort term samples. This mey account fee come of the inexece. Although specu lative at thin point, other factors co&d have included variations in ambient temperature, pcesure, and/or relative humidity, temporary changes la make up air supply, hood flowrate fluctuations, condition and type> mix, work techniques, height of the operator (physical proxnlty to the source of contamination), machine adjustment, ed/or contributory fiber encroachment from adjacent operations i.e. Blok Press. strip Finish, etc. The short term samples were eollecte during a period of peak work activity to determine if asbes** concentrations exceeded the established Cni,linc Limit of lOSibers per milliliter greeter than 5 eierons in length. This list is pert of the onterio standard which prohibits any exeuxsons above the 10 fiber level. As indicated in the report, all th* consecutive short term samples at 27.90 ng/Y<3, 17.31 mg/W and 27.49 mg/h3 exceeded the ceiling Limit. Considering tfc conditions existent at the time from a subjective viewpoint, t is likely that continued short term sampling throughout th day would have yielded a distributed average 3 hour expo*a* level of similar high SPNY 001315 SCF-ABEX-1790