Document 9JypgdvDv7QJnnV6JK9nrQbr6

PUBLIC health division . DEPARTMENT OF HEALTH (416) 365-4066 WRG UUU4U4 OCT l -1971 ENVIRONMENTAL HEALTH SERVICES SRANCH Out ST.CLAIR AVCMUC WIST TORONTO T. ONTARIO September 30, 1971 Hr. W. F. Hunter, Sales Manager, F. Hyde (Ontario) Limited, 3349A Bloor Street West, Toronto, Ontario. Dear Mr. Hunter: Enclosed please find a copy of the results of sampling done in a school where Mono Kote III" was being used. It is apparent from the results that the "Mono Kote" mixing and spraying operations do produce air borne fibres which could occasionally exceed the TLV. Hence, in my opinion, all the dust control measures applicable to an asbestos spraying operation should also apply to the mixing and spraying of "Mono Kote". Tours truly. GSR/jt Enel. G. S. Rajhans, P.Eng., Dust Control Specialist, Occupational Health Service 20172569 health stuoies employee health environmental health services OCCUPATIONAL HEALTH RADIATION PROTECTrIiOONN PESTICIDES CONTROL PUBLIC HEALTH ENSINEERINO VETERINARY PUBLIC HEALTH ONTARIO OEPARTfCNT OF HEALTH ,OCCUPATIONAL HEALTH LABORATORIES TEL: 360 Christie Street, Toronto 4 Ont. 3G5-7925 PE: Air samples or total oust load ano asbestos taken on September 2 \ 1971 at a construction project in the r,.5. henry .conoary School, North York. Requested by Mr. G. Rajha-.s ano Mr. D. Little or Double Distribution Ltd., SCO Eclinton Ave, East, Room 209, Toronto 350. REPORT NOl 4, 626 DATE t Sep T. 27, 1971 Dr . V. T1DCy(2) COPIES TO: Mr . G. RAJHANS Or. J. Cowle(2) Mr. J. McUair(2 Mr. H. Wall (2 FROM: C. Rhooes Mono *ote III was peinc used at the above construction site OURINC THE time or OUR VISIT. The roLLOwiNC tables list the locations and results or the AIR SAMPLES THAT WERE TAKEN: Sample No. ano Location Total Dust Loao Dust Milligram s7ct7, Meter Air 1. Beside operator, spraying wet material, 2. Beside mixer (ourinc charging ano mixing cycles.), 7.0 0.6 Note: Sample No.I was splattered with wet material being sprayed ano cannot oe CONSIDERED A TRUE PICTURE Or THE DUST CONDITIONS. Sample No. and Location Asbestos Fibre Asbestos Fiores >5 micron*: in leh<;th7mi .Ai i. Beside operator spraying wet material. . Beside mixer (charging cycle). 5 Backcrouho, mixer operator's station (no operation). -. MiXCR OPEnAVuP'i STATION, CHARC INC MIXER. t 2 3 <| 5 The present Threshold Limit Value por asbestos pibre is 5 fibres >5 microns in lencth/ml. or AIR. Comments: The SPRAYING OPERATION WAS BEING CARRIED OUT IN THE CORRIDOR. OF THE SCHOOL. THE I ALLS ANO OPENING WERE ORAPEO WITH POLY-ETHYLENE SHEETS. The MIXER WAS LOCATED IN AN OPEN ROOM TO ONE SIQE OF THE CORRIOOR. THE OUTSIOE I ALL OF THIS ROOM HAO NOT BEEN COMPLETED. A MASK WAS WORN BY THE OPERATOR SPRAYING THE MATERIAL BUT NOT BY THE EMPLOYEE DERATING THE MIXER. .L rw_ c 2volov3ky C, Rhooes 20172570