(1) When required by these rules or when provided voluntarily, at least one lifeguard shall be on duty at all times per 2000 square feet of pool area or fraction thereof, except:

(a) during organized swim lessons with certified lifeguards as instructors for no more than ten swimmers each, a lifeguard must be on duty for the first 2000 square feet of pool area with an additional lifeguard for each additional 4000 square feet of pool area; or

(b) a pool facility may temporarily reduce the number of lifeguards required by closing an appropriately sized portion of the pool.

(2) Lifeguards must be stationed in a position which gives the lifeguard an unobstructed view of the area of the pool the lifeguard is responsible to patrol to ensure that the lifeguard is able to recognize a person in distress and provide for a rescue if needed.