Are steel or concrete secondary containment installations allowed to be equipped with a drainpipe?
A. Yes. The OSFM will allow this as a method of removing rainwater from the secondary containment area of small dikes or steel pans. However, three conditions apply: 1. The piping must be equipped with a lockable valve that is kept locked in the closed position and only under the control of responsible personnel at the facility. 2. The opening created when the pipe passes through the secondary containment wall must be sealed with appropriate material that will resist the passage of product to the outside of the containment area. 3. Only one such penetration is allowed per secondary containment area.
