Posted By Luke. Client wants me to include confined spaces (more specifically - gas detection) into a max 1.5 meter deep trench, the guys will be laying pipes in short duration work, head will be above trench most of the time.... bit of a new one to me... as all of our guys are confined space trained but never had the request for gas detection in a 1.5 meter deep trench with sloping access....trench is outside (sorry to point out obvious) any pointers (don't want to be OTT with this)

Posted By steve hardcastle confirmation of soil conditions - trapped methane etc, clearance zone to preclude vehicle emmissions and gas chech, designate trench as gas check zone in specific RA.

Posted By Bob Y As Bryan says, often a common requirement, although not always based on risk but rather a 'blanket' requirement. In saying that there are some areas, I believe the Thames valley is one, where certain soil types can either release trapped gases or reduce oxygen levels so some gas monitoring may be required. As has also already been said, exhaust gases from nearby vehicles or plant may also enter the trench.