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important natural processes, and to uncover still more important questions in
need of better theoretical understanding.
In addition to his individual research contributions Paul was an
accomplished teacher and mentor.
Abel Wolman (June 10, 1892 – February 22, 1989) was an American
inventor, scientist, professor and pioneer of modern sanitary engineering. His
work in supplying clean water spanned eight decades.
Wolman was born, grew up, was educated, lived and died in Baltimore,
Maryland. He graduated from the Baltimore City College in 1909, got a B.A.
from the Johns Hopkins University in 1913 and then a B.S. in engineering
from Hopkins in 1915. It was during his early years that he made his most
important contribution. Working in cooperation with chemist Linn Enslow,
he standardized the methods used to chlorinate Baltimore's drinking-water
supply. His efforts there helped develop the plan for Baltimore's water supply
so thoroughly and effectively that it remains well-provided for growth
through the 21st century. His work also benefited water systems in New
York, Detroit and Columbus, Ohio. A collection of his writings has been
published: Water, Health and Society, Selected Papers.
Wolman taught for many years on the faculty of Johns Hopkins
University, where he established the Department of Sanitary Engineering in
1937. He served as the department's chairman until his official retirement in
1962.
The Association presents the Abel Wolman Award of Excellence each
year to recognize those whose careers in the water works industry exemplify
vision, creativity, and excellent professional performance characteristic of
Wolman's long and productive career.
INTERNATIONAL SAFETY STANDARDS
Threshold Limit Value (TLV)
The American Conference for Governmental Industrial Hygienists
(ACGIH) has established guidelines for exposure to airborne contaminates.
These guidelines are widely accepted and updated annually. The TLV of an
airborne chemical represents the concentration of that chemical below which
there is thought to be no significant adverse effect on most workers. In devel-
oping TLV’s it should be assumed that workers may be repeatedly exposed,
day after day, to the chemical.
Not every chemical will have a TLV. For more information on TLV’s,
refer to your ACGIH Threshold Limit Values for Chemical Substances and
Physical Agents and Biological Exposure Indices booklet. (2002 NSC Fun-
daments of IH workbook)
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