18 AAC 30.510. Design and materials

(a) Nonabsorbent materials must be used to construct pools or pool decks. Mildly abrasive, nonslip surfaces must be used on pool decks, steps, ramps, and diving boards. Pools and pool decks must be constructed of light-colored, durable, and nonabsorbent materials that are nontoxic to humans and the environment.

(b) Decks, side walls, bottom surfaces, gutters, and components must have smooth, easily cleanable surfaces without sharp edges or protrusions.

(d) Steps and ladders must provide easy access to both ends of the pool and must drain completely when the pool is emptied. Step risers must be no higher than 12 inches, and must be uniform in height, except that the bottom riser may be less than the uniform height.

(e) Aluminum pools must be designed and maintained to minimize the effects of electrolysis. Anodes and cathodes must be installed and maintained in aluminum pools.

(f) An absolute separation is required between the pool deck and the spectator area. There must be no means by which bathers can directly enter the spectator area, or by which spectators can directly enter the pool deck.

(g) Entrances to the pool deck from locker rooms must be at the shallow end of the pool.

(h) The ventilation system in a pool enclosure must provide a minimum rate of 20 cubic feet per person per minute, or six complete air exchanges per hour, whichever is greater. The ventilation system must prevent direct drafts on bathers and must minimize condensation.

(i) Natatorium lighting must be designed to permit the replacement of light bulbs or tubes.

(j) The circulation system must be designed for 100 percent flow through the overflow channels and 100 percent flow through the main drains. During normal operations the overflow channels must use at least 60 percent of the return flow.

(k) Hose bibs with back siphonage preventers must be used around the deck so that all parts of the deck may be reached with a 50-foot hose.

( l ) At least one drinking fountain is required within the pool enclosure.

(m) Diatomaceous earth filters must have a maximum flow rate as recommended by NSF Standard 50, Swimming Pools, Spas, or Hot Tubs Circulation System Components, dated June 1, 1992, the requirements of which are incorporated by reference in this chapter, and in no case may exceed 1.5 gal/ft 2 /min. Rapid sand filters must have a maximum flow rate of 3 gal/ft 2 /min. High rate sand filters may not exceed flow rates of 20 gal/ft 2 /min. unless approved by the department. Each pressure filter must have a pressure gauge on each side of the pressure filter (influent and effluent); or, for a vacuum filter, one pressure gauge after the filter but before the pump. In addition, each filter must have a gauge measuring the rate of flow through the filter system. This gauge must be installed in a readily visible location, have a scale range approximately one-half times the design flow rate, and be accurate to within 10 percent of the true flow.

(n) Pools built after June 4, 1983 must have a continuous disinfection system with an automatic sensor control.

(o) Plans submitted under 18 AAC 30.950(a) , including floor plans, specifications, and reports, must contain information sufficient to demonstrate to the department that the proposed pool or improvements will comply with this chapter. The plans must be to scale, and must

(1) include a floor plan showing the location of the pool, deck, dressing rooms, spectator area, mechanical room, and all other areas and rooms provided in conjunction with the pool facility; and

(2) clearly describe

(A) construction materials and finishes of floors, walls, and ceilings;

(B) type and placement of light fixtures;

(D) pool construction materials, dimensions, slopes, area, and volume;

(E) flow rate, turnover, and filtration rate;

(F) anticipated maximum and average swimmer load;

(G) analyses of the source, quantity, and quality of the water supply, as determined under 18 AAC 80.250, including analyses of the alkalinity, pH, iron, and manganese;

(H) the filtration system recirculation equipment, and piping, including

(i) hydraulic computations that include head loss;

(ii) pump curves showing that the proposed recirculation pump will adequately handle proposed flows;

(iii) schematic diagrams, including plan and elevation views; and

(iv) construction details, including dimensions, appropriate cross sections, and color coding of the piping; and

(I) complete, detailed specifications for all other equipment, components, fixtures, and furnishings to be installed at the pool facility.

(p) Changes to or replacements of fixed or installed equipment must meet the requirements of this chapter unless the replacement is an exact duplicate of the unit being replaced, and the unit being replaced met the requirements of this chapter when it was installed.

(q) Exposed piping in pools and spas must be color-coded according to the color scheme set out in Table A of this section. If any two colors do not have sufficient contrast to easily distinguish between them, a six-inch band of contrasting color must be painted on one or more of the pipes at approximately 30-inch intervals. The name of the liquid or gas and arrows indicating direction of flow must be painted on the pipe.

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TABLE A COLOR-CODING REQUIREMENTS PIPING COLOR CODE Potable Water Lines Dark Blue Recirculation Filtered Aqua Skimmer or gutter return Olive green Main Drain Black Chemical Lines Alum Orange Chlorine (Gas & Solution) Yellow Soda Ash White Acid Pink Waste Lines Backwash Waste Dark Brown Sewer (Sanitary or other) Dark Gray Deck Drains Light Brown Other Compressed Air Dark Green Gas Green

History: Eff. 6/4/83, Register 86; am 12/23/93, Register 128

Authority: AS 44.46.020

Editor's note: A copy of NSF 50, Swimming Pools, Spas, or Hot Tubs Circulation System Components, dated June 1, 1992 referred to in this section may be reviewed at central and regional offices of the Department of Environmental Conservation. A copy may be obtained from NSF International, 3475 Plymouth Road, P.O. Box 130140, Ann Arbor, Michigan 48113-0140.

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