Industrial Hygiene Digest, Industrial Health News, Literature Abstracts, Medical, Engineering, Chemical, Toxicological, Legal.

13810 RULES AND REGULATIONS his responsive pleading and Introducing such evidence as he will be able to muster Guarding or Open-Sided Floors, Plattobus and Runways Pressure Vessels 60-204.120 Boilers.

OFFICERS OF THE GLASS AND CERAMICS SECTIOK NATIONAL SAFETY.

f sf3 fc] C=fl March, 196 3 Volume XXVII No. 3 Industrial Hygiene Foundation 4400 Fifth Avenue Pittsburgh 13, Pennsylvania INDUSTRIAL HYGIENE DIGEST Literature and News NEWS ITEMS 194 Gordon Research Conference in Air Pollution.

i hygiene surveys, industrial hygiene inspection surveys, industrial hygiene consultation regard* Ing process hazard evaluation and control; clay mine dust survey, glaas works dust survey, atmospheric gaseous pollutant survey, industrial hygiene survey training in the field, evalua tion of potential beryllium hasard in a new process, stack sampling for particulate matter and ammonia in a mixed fertiliser granulating plant; and site separation and x-ray diffraction Htnalysts of dust samples. 4) BlhUograjhlcjnesearcli was performed on several chemical compounds. 5) Epidemiological studies were undertaken on an industry-wide basis in conjunction with several member companies.

WORKMEN'S COMPENSATION AND INSURANCE TABLE 11-A NUMERICAL EXEMPTIONS FOR WORKMEN'S COMPENSATION LAWS Jurisdictions making no numerical exemptions Alaska California District of Columbia Hawaii Idaho Illinois1 Indiana Iowa Louisiana Maryland Minnesota Montana Nebraska New Jersey New York North Dakota Oregon Pennsylvania Puerto Rico South Dakota Utah Washington West Virginia Wyoming United States (Federal employees and longshoremen) In the following jurisdictions, employers are exempt who have fewer than-- 2 employees 3 employees 4 employees 5 employees 6 employees Connecticut Nevada Oklahoma Arizona Delaware Florida Kentucky Michigan New Hampshire Ohio Texas Wisconsin Colorado Massachusetts' New Mexico' Rhode Island Arkansas' Kansas" North Carolina* Tennessee Mame Vermont 7 employees 8 employees 10 employees 11 employees 15 employees Virginia Alabama Mississippi Georgia Missouri' South Carolina Sources State Workman* Comp*n*atton Law*, Bulletins 161 and 212, U 8 Department of Labor, Jan. 1264.

EMERGENCY ACTION PLANS hazard control points in the plant.

TABLE 45-D2 CAPACITIES OF STANDARD DISHED HEADS WHEN FILLED TO VARIOUS DEPTHS Contents given in U S. gallons (or one head only SAFETY E N C IN E E R IN C TABLES Dlara Diplb of Liquid.

@8 @> OO PI J-------- 1 C=3 Industrial Hygiene Digest January, 1965 70 The Effects of Explosive Decompression on the Gastrointestinal Tract: A Preliminary Report.

Industrial Hygiene Digest INDEX Accident!

Industrial Hygiene Digest August. 1967 Operating pressure, resistance to How, and dynamic leakage were evaluated.

Industrial Hygiene Digest December, 1967 EDITORIAL Announcement has been made previously, at the Annual Membership Meeting on October 10, concerning negotiations between Industrial Hygiene Foundation and the University of Pittsburgh to provide for continued utilization of IHF's Research Lab oratory facilities following the completion of the merger creating Carnegie-Mellon University, since it appeared unlikely that Mellon Institute would continue its lease on the third floor of the Old Mellon Building on the Pitt campus (presently designated as the University of Pittsburgh's Physics Building).

Elements of Industrial Toxicology 1308 TABLE 42-B THRESHOLD LIMIT VALUES FOR 1968 Adopted at the 30th Annual Meeting of the American Conference of Governmental Industrial Hygienists, St Louis, Missouri, May 13> 1968 Copyright 1968, by Amen can Conference of Governmental Indus trial Hygienists Reprinted with Permis sion The Threshold Limit Values refer to air borne concentrations of substances and rep resent conditions tinder which it is be lieved that neatly all workers may be repeatedly exposed, day alter day, without adverse effect Because of wide variation in individual susceptibility, exposure ol an occasional individual at or even below the threshold limit may not prevent discomfort, aggravation ol a pre-existing condition, or occupational illness Clinical tests are becoming available that pennit detection of those individuals who will hyperreact upon exposure to certain industrial substances Being predictive in character, the> may he applied as screening tests in the prcplaccnient job examination Bequests lor furthei details of these tests should he directed to the Chairman of the Committee Threshold limits should he used as guides in the control ol health hazards and should not be regarded as fine lines between safe and dangerous concentra tions Exceptions ate the substances given in Appendix A and certain of the substances given a "CV listing 1 he values not given a "C" listing refer to tune-weighted average concentrations for a conventional 7 or 8 hour workday Tune-weighted average concentrations permit excursions above the limit, provided they are compensated by equivalent ex cursions below the limit during the work day The degree of permissible excursion is pegged to the threshold limit value of the particular substance as given in table in Appendix C under "Test TLV Factor " Hence, it is not considered appropriate to interpret air concentration values as ex ceeding time-weighted average limits, if such values he within the permissible ex cursions (See section on "Legislative G>de ") The amount by which these concentra tions may be exceeded for short periods without injury to health depends upon a number of factors such as the nature of the contaminant, whether very high concentra tions even lor short periods produce acute poisoning, whether the effects are cumu lative, the frequency with which high con centrations occur, and the duration of such periods All must be taken into considera tion in arriving at a decision as to whether a hazardous situation exists Enlightened industrial hygiene practice inclines toward controlling exposures below the limit rather than maintenance at the limit Threshold limits are based on the best available mfoimation from industrial ex perience, from experimental human and animal studies, and when possible, from a combination of the three The basis on which the values arc established may differ from substance to substance, protection against impairment of health may be the guiding factor from some, whereas reason able freedom from lintation, naicosis, nuisance or other forms of stress may dom inate the basis lor others The Committee holds to the opinion that limits based on physical irritation should be considered no less binding than those based on physi cal impairment, growing bodies of evi dence indicate that physical untation may promote and accelerate physical impair ment These limits are intended for use in the field of industrial hygiene and should be interpreted and applied only by persons trained in this field They are not intended for use. or for modification for use, (1) as a relative index ol toxicity, by making a ratio of two limits, (2) in the evaluation or control of community air pollution or air pollution nuisances, (3) in estimating the toxic potential of continuous uninterrupted exposures, (4) as proof or disproof of an existing disease or physical condition, or (5) foi adoption by countries whose work ing conditions differ from those in the United States ol America and where sub stances and processes differ Documentation of Threshold Limit Val ues A separate companion piece to the TLV's is issued by ACCIH under this title This publication gives the pertinent scien tific information and data with reference

PLAINTIFF'S f 335^* EXHIBIT -377?

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