The big picture. A technical amendment to an existing Professional Engineer (PE)-Certified SPCC Plan is required anytime “there is a change in the facility design, construction, operation, or maintenance that materially affects its potential for a discharge as described in § 112.1(b).” The amendment must be implemented within six months of the change at the facility (or less, for some states). At least every 5 years, the original plan must be reviewed as described be