A description of the proposed changes are as follows:
INDUSTRY SAFETY ORDERS
INFORMATIVE DIGEST OF PROPOSED ACTION/PLAIN ENGLISH OVERVIEW
Section 5155, Airborne Contaminants.Section 5155, Airborne Contaminants, establishes minimum requirements for controlling employee exposure to specific airborne contaminants. This Section specifies several types of airborne exposure limits, requirements for control of skin and eye contact, workplace environmental monitoring through measurement or calculation, and medical surveillance requirements. California periodically amends the airborne contaminants table (Table AC-1) in this regulation to keep the standard consistent with current information regarding harmful effects of exposure to these substances and other new substances not listed. The standard was last revised in 1994. In this revision, the substances chosen for review were taken from the 1993-1994, 1995-1996, and the 1996-1997 editions of the Threshold Limit Values (TLVs) published by the American Conference of Governmental Industrial Hygienists (ACGIH). Additionally, the exposure limit for fiberglass insulation materials is proposed to be changed due to the consideration of a petition requesting an exposure limit based on airborne fiber counts. The particular substances which are the subject of this rulemaking action are as follows:
The exposure limits of the following substances are proposed to be lowered:
Water insoluble Cr (VI) compounds
Manganese, manganese compounds, manganese fume, and manganese tetroxide
Mercury and inorganic mercury compounds
Phenyl glycidyl ether
Vinyl cyclohexene dioxide
Exposure limits for the following substances are proposed to be added to Table AC-1 (new substances):
Methyl tert-butyl ether
Short term exposure limits (STEL) are proposed for the following substances in Table AC-1:
Skin notations are proposed for:
Phenyl glycidyl ether
Ceiling limits are proposed to be added to the following substances in Table AC-1:
The ceiling limit for manganese and manganese compounds is proposed to be deleted and replaced with an eight hour time weighted average limit.
The current reference from "Glass, fibrous or dust (<7Ám in diameter)" to "Particulates not otherwise regulated" is proposed to be replaced with a new PEL for "Glass, fibrous" based on the unit fibers per cubic centimeter.
Respirable fraction limits are proposed to be added to the PELs for amorphous Silica, Diatomaceous earth, and Diquat.
The effect of this amendment is to reduce the risk of material impairment of health or functional capacity for employees exposed to the above substances.
All proposed changes to Section 5155 are considered at least as effective or more stringent than the federal OSHA requirements in Title 29, Code of Federal Regulations (29 CFR) section 1910.1000, Airborne contaminants.
PLAIN ENGLISH OVERVIEW
A noncontrolling plain English summary of the proposal has been prepared and is attached as Attachment No. 5.
DOCUMENTS INCORPORATED BY REFERENCE
* The National Institute for Occupational Safety and Health (NIOSH), Method 7400, Issue 2, August 15, 1994.