Each commercial seaplane base shall have, in addition to the facilities required for a commercial airport as set forth in section 15-41-29, the following service facilities:

1. (1) At least one life preserver of the ring or throwing type with sufficient line attached, kept available on the ramp, dock or float;
2. (2) a boat, approved by the department, immediately available at all times that flights are in progress;
3. (3) a dock, or float, suitable for the type of seaplane using the base, so located as to afford the maximum degree of safety in taxiing;
4. (4) suitable beaching facilities for the type of aircraft using the base. Where an adequate ramp is maintained, the dock or float may be omitted;
5. (5) an adequate supply of lines for heaving, towing, securing or rescue operations.