Mississippi Administrative Code
Title 11 - Mississippi Department of Environmental Quality
Part 5 - Underground Storage Tank Regulations
Chapter 2 - Mississippi Commission on Environmental Quality Underground Storage Tanks Regulations Technical Standards and Corrective Action Requirements for Owners and Operators of Underground Storage Tanks (UST) (Adopted March 22, 1989; Amended August 25, 2011, Last Amended August 23, 2018)
Appendix 11-5-2-280.1 - GUIDELINES FOR THE EVALUATION OF UNDERGROUND STORAGE TANK CATHODIC PROTECTION SYSTEMS
Section 11-5-2-280.1-7 - DOCUMENTATION OF EVALUATION
Section 11-5-2-280.1-7.1 - Documentation
Section 11-5-2-280.1-7.1.4 - Pass/Fail/Inconclusive
In order to assure uniformity in the manner in which cathodic protection evaluations are documented, it is necessary to "make a call" as prescribed in the MDEQ cathodic protection evaluation form found in Appendix K and L of this document. The terms "pass", "fail" and "inconclusive" are utilized for this purpose. Therefore, it is necessary to clarify what these terms mean and their applicability as related to the evaluation of cathodic protection systems utilizing the MDEQ forms. An evaluation conducted by an individual who is only qualified as a cathodic protection tester must result in one of three conclusions, pass, fail or inconclusive. If the person conducting the evaluation is qualified as a corrosion expert, the evaluation must result in either pass or fail.
Pass - The term "pass" as related to Section VI and Vll (tester's/corrosion expert's evaluation) of the MDEQ galvanic/impressed current cathodic protection system evaluation forms is taken to mean that the structure-to-soil potential survey indicates all of the protected structures at a facility meet at least one of the three accepted criteria. Pass as related to Section XIV and XVI (potential survey) of the respective MDEQ galvanic/impressed current cathodic protection system evaluation forms means that the individual structure that is being tested meets at least one of the accepted criteria.
Fail - The term "fail" as related to Section VI and VII (tester's/corrosion expert's evaluation) of the MDEQ galvanic/impressed current cathodic protection system evaluation forms means that the structure-to-soil potential survey indicates that there are one or more protected structures at a facility that do not meet any of the accepted criteria. Fail as related to Section XIV and XVI (potential survey) of the respective MDEQ galvanic/impressed current cathodic protection system evaluation forms means that the individual structure that is being tested does not meet any of the accepted criteria.
Inconclusive - The term "inconclusive" as related to Section VI (tester's evaluation) of the MDEQ galvanic/impressed current cathodic protection system evaluation forms means that a person qualified only as a tester is unable to conclusively evaluate the cathodic protection system and a corrosion expert must "make the call". A cathodic protection tester must indicate inconclusive whenever one or more of the conditions listed in Section 7.2 of this document are applicable.
Inconclusive as related to Section XII and XV (continuity testing) of the respective MDEQ galvanic/impressed current cathodic protection system evaluation forms means that it cannot be determined if the individual structure that is being tested is either electrically isolated in the case of galvanic systems or is electrically continuous in the case of impressed current systems.
Inconclusive as related to Section XIV of the MDEQ galvanic cathodic protection system evaluation form is utilized when both the local and the remote potential measurements do not result in the same conclusion. If for instance the local potential was -900 mV but the remote was -700 mV an inconclusive would result since the local indicates that adequate cathodic protection is provided but the remote does not.
