Page 232 - Safety Memo

• Burns, rashes, and skin irritations from exposure to b. The LAZ shall be established on the side that does not
cement dust or wet concrete. have scaffolding. 1722(a)(2)
c. The width of the LAZ shall be equal to the height of the
• Silicosis, a respiratory disease caused by inhaling silica wall to be constructed plus 4 ft. and shall run the entire
dust from exposure to concrete dust during such length of the wall. 1722(a)(3)
operations as concrete cutting, drilling, grinding, or
sandblasting. d. The LAZ shall be entered only by employees actively
engaged in constructing the wall. No other employee
• Broken bones, lacerations, and crushing injuries caused shall be permitted entry. 1722(a)(4)
by falls from elevated work surfaces; impalement by
rebar or other objects; and impact from falling objects, e. The LAZ shall remain in place until the wall is
form and shoring failure, and structural failure of adequately supported to prevent collapse unless the
components of the project. height of the wall is more than 8 ft., in which case the
LAZ shall remain in place until the requirements of
Because the hazards associated with concrete construction are 1722(b) have been met. 1722(a)(5)
great, employees must use appropriate personal protective D. Precast, prefabricated concrete construction, tilt-up,
equipment and conform to safe work practices at all times (see panels. 1715
below).
1. An erection plan, addenda, and procedure shall be
A. Placement of Concrete. 1720 prepared by or under the direction of a Professional
1. Concrete pumping equipment and placing booms shall Engineer registered in California.
be set-up and operated according to manufacturer’s 2. The erection plan, addenda, and procedure shall be
guidelines and the title 8 safety orders. available at the job site.
2. The manufacturer’s operation manual shall be maintained 3. Job site inspections shall be made by the responsible
in legible condition and available at the job site. engineer (or representative) during the course of erection.
3. Controls in the equipment shall have their function clearly 4. Proposed field modifications shall be approved by the
marked. responsible engineer.
4. Operation of concrete placing booms in proximity of E. Rebar and other impalement hazards. 1711 and 1712
overhead high-voltage lines shall be in accordance with
Article 37 of the High-Voltage Electrical Safety Orders. 1. Employees working at grade or at the same surface level
as exposed protruding rebar or similar projections shall
5. Equipment shall be inspected by a qualified operator prior be protected against impalement by guarding exposed
to daily use and the inspection must be documented. ends that extend up to 6 feet above grade or other work
B. Forms/falsework and vertical shoring in the Forms, Falsework, surface, with approved protective covers or troughs (see
and Vertical Shoring section of this guide. 1717 Illustrations 1 and 2). 1712(c) and (d)
C. Masonry construction. 1722 2. Employees working above grade or above any surface
and who are exposed to protruding rebar or similar
1. All masonry walls more than 8 ft. high must be braced to projections shall be protected from impalement by:
prevent overturning and collapse unless the wall is
adequately supported through its design or construction a. The use of guardrails, or
method. The bracing shall remain in place until permanent b. Approved fall protection systems, or
supporting elements of the structure are in place. 1722(b)
c. Approved troughs and covers per 344.90, 1712(c) and (d).
2. A limited access zone (LAZ) shall be established
whenever a masonry wall is being constructed and must 3. Job-built wood protective covers and troughs shall be
conform to the following: built of at least “standard grade” Douglas Fir.
a. The LAZ shall be established before the start of
construction. 1722(a)(1)

22 Cal/OSHA Pocket Guide for the Construction Industry June 2019 Cal/OSHA Pocket Guide for the Construction Industry | June 2019 23