I have written about the differences between a CS vs. PRCS many times, but one situation that we must NEVER loose sight of is that many PRCS today are caused by the work taking place within them and NOT the normal PRCS hazards. What do I mean by this? The entry supervisor checks the atmosphere at 7:00 a.m. and everything is fine and in a few hours there is an emergency inside the space. This weeks CAL-OSHA news regarding two (2) plumbers in a crawl space who were overcome with CO while using a gas-powered saw. The crawl-space is
