They are designed to allow a borehole integrity test and manifold shut-in test using ‘reach-in’ valving. Special designs accommodate split sampling, two-level sampling, and sequential TO-15 / TO-17 sampling.

OSHA PELs (Permissible Exposure Limits)

NIOSH RELs (Recommended Exposure Limits)

DFG (Germany) MAKs (Maximum Concentration Values)

US DOE SCAPA TEELs (Temporary Emergency Exposure Limits for DOE sites only)

ACGIH TLVs (Threshold Limit Values)

SCAPA HBELs (Health-based Exposure Limits)