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ORDINANCE NO. NS-]503 PAGE SEVEN Sec. 7-35. Al6 Zone - Residential structures. (a) Ail new construction and substantial improvements of residential structures (other than mobile homes) within the Al6 zone must have the lowest floor (including basement) elevated to or above the base flood level shown on the Flood Insurance Rate Maps. (b) Mobile homes may not be placed in the Al6 zone. Sec. 7-36. Al6 Zone - Nonresidential structures. Ail new construction and substantial improvements of nonresidential structures in the Al6 zone must either: (1) have the lowest floor (including basement) elevated to or above the base flood level shown on the Flood Insurance Rate Maps; or (2) together with attendant utility and sanitary facilities, be designed so so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. Sec. 7-37 A Zone. (a) Residential structures and mobile homes may not be constructed or placed in the A Zone. (b) Ail new construction or substantial improvements of nonresidential structures in the A zone must have the lowest floor (including basement) elevated or flood-proofed to or above the base flood level. Any base flood elevation data available from a federal, state, or other source shall be obtained, reviewed, and reasonably utilized prior to issuance of any permit for such construction. DIVISION 3. VARIANCES Sec. 7-41. Grounds for issuance. The Director of Building Safety may grant a variance from the requirements of this part if he makes written findings that the following requirements are satisfied: (1) The new construction or substantial improvements are to be erected on a lot of one-half acre or less in size, contiguous to and surrounded by lots with existing structures constructed below the base flood level; (2) The applicant has shown good and sufficient cause; (3) Failure to grant the variance would result in exceptional hardship to the applicant; (4) The granting of the variance will not result in increased flood heights, additional threats to public safety, extraordinary public expense, creation of nuisances, fraud on or victimization of the public, or conflict with other City ordinances; and (5) The variance is the minimum necessary considering the flood hazard, to afford relief.