46 C.F.R. § 150.150
The Commandant (CG-ENG-5) authorizes, on a case by case basis, exceptions to the rules in this subpart under the following conditions:
(b) When two cargoes shown to be compatible in Figure 1 meet the standards for an incompatible pair in Appendix III.
Appendix I contains cargoes which have been found to be exceptions to Figure 1, the Compatibility Chart.
[CGD 83-047, 50 FR 33038, Aug. 16, 1985, as amended at CGD 95-072, 60 FR 50465, Sept. 29, 1995; CGD 96-041, 61 FR 50731, Sept. 27, 1996]