"Depth" The actual depth of the dive measured in feet below the water's surface. For purposes of determining pressure equivalents, these measurements are assumed to be salt water at 0.445 pounds per square inch per foot of depth (0.445 psi/ft depth). Fresh water equals 0.432 psi/ft depth.
Or. Admin. Code § 437-002-0342
Stat. Auth.: ORS 654.025(2) & ORS 656.726(3)
Stats. Implemented: ORS 654.001 - ORS 654.295