(1) The design and construction of recessed treads in the pool wall shall conform to the following requirements:

(a) All recessed treads shall have slip-resistant surfaces;

(b) Recessed treads shall have a uniform vertical spacing of seven inches minimum to nine inches maximum;

(c) Recessed treads shall have a depth of five inches minimum and a width of 12 inches minimum;

(d) Recessed treads shall be provided with a handrail on each side of the treads; and

(e) Recessed treads shall drain into the pool.