Beryllium, the criteria document Page: 4 of 13
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quantitative way. Even if data could be gathered showing
prolonged exposure at levels two to five times the standard
it would be necessary to follow the exposed workers medical-
ly for the rest of their lives to demonstrate an absence of
long term effects. The existing standard does require very
careful'attention to the design and operation of ventilation
and other controls. Relaxation of the air concentration
standards by two to five times does not greatly reduce the
stringency of the control measures required. There is no
great incentive to seek this degree of relaxation. The
concentration standards have been met ir practice and are
demonstrably feasible. It is unlikely that these numbers
will decrease appreciably in the future while standards
for many other materials have decreased and will probably
continue to decrease. In the future, the beryllium concen-
tration may not appear so out-of-line with other toxic sub-
stances as it has in the past.
Air Concentration Measurements
The standard requires quarterly measurements of the
air concentration in the breathing zone and if concentra-
tions in excess of the standard are found, the required fre-
quency is increased to monthly. Monthly sampling is contin-
ued until two consecutive thirty day samples are obtained
showing time-weighted-average concentrations to be below
2 pg/m3. This is a reasonable approach although many em-
ployers will sample more frequently than this. 180 days are
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Schulte, H.F. Beryllium, the criteria document, article, January 1, 1973; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1036190/m1/4/: accessed April 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.