The construction Code of Safe Practices standard also requires periodic 'tailgate' or toolbox safety meetings. How often must these supervisory safety meetings be held?

解析

Section 1509(e) requires supervisory employees to hold toolbox or tailgate safety meetings, or the equivalent, with their crews at least every 10 WORKING days. Reading the same figure as calendar days shortens the interval to about two weeks of work into roughly one, which is why it is the near-miss answer. Monthly is the informal habit many contractors fall into and meets nothing in the standard. Quarterly is the minimum meeting frequency for a labour-management safety committee under section 3203(c)(1), which is an alternative way to satisfy the IIPP communication element - it does not replace the crew tailgate.