The following uses may be permitted by conditional use permit issued pursuant to the provisions of this chapter and Chapter 17.92:
(A) Improvements and additions to or modifications of existing permitted buildings and structures, the floor levels of which do not meet the requirements as stated in § 17.56.030(A);
(B) All uses permitted in the respective zone with which the FP-2 zone is combined, when properties which lie within a FP-2 zone have been protected by manmade dikes or levees, not constructed by local, state or federal agencies solely for the protection of the area so zoned or by private persons according to the construction standards followed by local, state or federal agencies in their construction of said protective barriers.
(`78 Code, § 17.56.040.)