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

Current through June 25, 2024
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.