If the department approves the design and construction plan and authorizes construction, the design engineer shall:

(1) Conduct a post-construction inspection of the completed cast-in-place tank;

(2) Verify all applicable requirements were satisfied;

(3) Verify all excavation, backfill, and compaction conform to the project's approved design and construction plan and specifications; and

(4) Verify construction is complete and submit a construction certification to the department prior to use.