18 AAC 30.550. Water, wastewater, and solid waste

(a) Potable water must be provided from a source approved under 18 AAC 80. The water supply must be adequate for the purposes of the facility and must meet the standards of 18 AAC 80.

(b) Samples of pool water must be collected at least monthly while the pool is in use, at a point near the outlet of the pool, and at any other points designated by the department. The department will, in its discretion, increase the frequency of pool water sampling if necessary to assure that the pool water meets the standards of this section.

(1) contain more than 200 bacteria per milliliter, as determined by the standard (heterotrophic) agar plate count (35УИ C); or

(2) show positive test (confirmed test) for coliform organisms in any of the five 10 milliliter portions of a sample, or when the membrane filter test is used, show positive test (confirmed test) for more than zero coliforms organisms per 100 milliliter.

(d) Samples of pool water must be collected and examined in accordance with the American Public Health Association's Standard Methods for the Examination of Water and Wastewater , 16th Edition, 1985.

(e) If a sample of pool water tests positive for pseudomonas or other pathogens, the pool must be closed until sampling shows that the water is free of the pathogen.

(f) Samples of pool water must be examined by a laboratory certified by the department under 18 AAC 80.

(g) If chlorine is used as a disinfectant, the level of free chlorine must provide a molecular hypochlorous yield of not less than 0.3 mg/l. The yield must be determined either mathematically or by using the graph in Table E of this subsection.

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To determine correct free chlorine dosage at a measured pH

(1) find the measured pH on the horizontal axis of the graph;

(2) follow the corresponding vertical line up to where it crosses the curved 0.3 mg/l line; and

(3) from this point, draw a horizontal line to the axis and determine the minimum free chlorine dosage required.

To determine if a sample at a specific pH and free chlorine level meets the standard

(1) read horizontally from the free chlorine level determined by testing;

(2) read vertically from the tested pH;

(3) if the point where these lines cross is below the line of the curve, the sample does not meet the standard and the free chlorine dosage must be increased or the pH lowered; and

(4) if the point where these lines cross is on or above the line of the curve, the sample meets the standard.

(h) In addition to the requirements of (g) of this section, the following requirements apply to the level of free chlorine:

(1) chloramines may not exceed one-half of the total chlorine level;

(2) chlorinated isocyanurates and cyanuric acid may not be used;

(3) only solution feed systems may be used, but erosion feed systems and manual feed systems may not be used;

(4) gas chlorinators must feed no more than three pounds of chlorine per 10,000 gallons of pool volume in a 24-hour period; and

(5) mechanical means must be used to dispense pool chemicals and disinfectants that are added routinely; chemicals may only be applied directly into the pool by hand during an emergency to super-chlorinate or otherwise adjust pool water quality; hand application may only occur when the pool is closed to bathers.

(i) The pH of pool water must be kept between 7.0 and 8.0 when bathers are in the water.

(j) Alkalinity must be kept between 50 and 200 mg/l and must be measured at least once a week.

(k) Pool water must not cause corrosion or scaling of the pool. Total hardness must be kept between 100 and 1,000 mg/l. Calcium hardness must be at least 70 percent of the total hardness. The saturation index must be within plus or minus 0.5.

( l ) The wastewater system must comply with 18 AAC 72. The sanitary sewer serving the pool and auxiliary facilities must discharge to a public sewer system whenever possible.

(m) Solid waste must be conveyed, stored, and disposed of in a manner which minimizes the development of odor, prevents waste from attracting and harboring vermin, and otherwise complies with 18 AAC 60. Any incinerator used by the facility must comply with 18 AAC 50.

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

Authority: AS 44.46.020

Editor's note: The document described in 18 AAC 30.550 may be obtained from the American Public Health Association, 1015 Fifteenth Street, N.W., Washington, D.C. 20005. The document may be reviewed at the central and regional offices of the Department of Environmental Conservation.

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