Versions of Tennessee Code 59-8-123 - Authorized departures from environmental protection performance standards on LawServer 2024 Tennessee Code 59-8-123 – Authorized departures from environmental protection performance standards 2023 Tennessee Code 59-8-123 – Authorized departures from environmental protection performance standards 2021 Tennessee Code 59-8-123 – Departure From Environmental Protection Performance Standards on Experimental Basis. [Contingent Effective Date, See Compiler’s notes.] 2020 Tennessee Code 59-8-123 – Departure From Environmental Protection Performance Standards on Experimental Basis. [Contingent Effective Date, See Compiler’s notes.] 2019 Tennessee Code 59-8-123 – Departure from environmental protection performance standards on experimental basis. [Contingent effective date, see Compiler’s Notes.]