Section 50.56 - Certification of Toxics Use Reduction and Resource Conservation Plans(1) A toxics use reduction planner shall certify a toxics use reduction plan or a resource conservation plan only if, in his or her independent professional judgment, the plan satisfies the requirements of 310 CMR 50.40 or 310 CMR 50.90, as applicable, and demonstrates a good faith and reasonable effort to identify and evaluate toxics use reduction and/or resource conservation options.(2) In certifying a plan, a toxics use reduction planner shall make a good faith and reasonable effort to identify and obtain relevant data or other information needed to comply with 310 CMR 50.56(1).(3) In certifying a plan, a toxics use reduction planner shall maintain records of the procedures used to review the plan. The planner shall maintain such records for at least five years from the date that the planner certifies the plan.