Document k6k802GGG1L9MybMYOYmkYk4O

r ku** -- ^--l exhaust ventilation is used as control at both locations. In addition to local * exhaust ventilation of the operations in .the Scientific Building, the concerned employe nrore an approved dust respirator.**',*;..-' lj* ,. i ` Hie jBfreehold Unit Value (TLV; for asbefft09*4e5 fibers greater than 3 microns in length per milliliter of air sampled. a^ftkis is an eight hour time-weighted <* average exposure limit. The celling limit exposure is 10 fibers greater , : t.hsirr 5__microng in len^th'per milliliter apir sampled. HesJhtaidsdlcate that notlcy weighted aCertge^lample exceeded the 3 fiber limit. Sample number I-A. k retirements the cutting and filing cycle of the destructive testJft and, therefore* should be considered^ peak sample vKH^the 10 fiber ceiling, limit applicabjdfl61*?^ vw >. U l\ l\ '* ions villtbe studied once againinsovemher 1973 relative to the monitoring 'provision ot^CjSHA? 1910.93A sub'^ITSSaiph f. \sv? \s? Charles 1%^ Plasters InduA^j^ Hygienist Indst^d.al Hygiene Section Bnp^oye Health Services Departoent ms cc |K.h. Harris* M.D. L^^^Jchauss Attachment 2233 u