R.I. Gen. Laws § 42-17.1-23

No underground storage tank (“UST”) or piping system associated therewith shall be installed, substantially modified, closed, or precision tightness tested; nor shall any corrosion protection system be installed, repaired, or maintained on any such UST or associated piping system unless such work is performed by, or in the presence of, a person who holds a valid, appropriate certification issued in accordance with chapter 27 of title 28.