NAC445A.67085. Storage structures: Coatings; disinfection.

     1. All metal surfaces of a storage structure must be properly protected by the application of paint or another coating. The coating used must not result in the transfer of any substance into the water which imparts a taste or odor to the water or causes the water to exceed any primary or secondary standards. All internal coatings must be determined to be compatible with drinking water.

     2. A storage tank, whether coated in the field or in the factory, must not be placed into service unless:

     (a) The tank is cured for the appropriate time.

     (b) After the tank is cured, the tank is filled with water and the water is retained in the tank for 5 days.

     (c) The water retained in the tank is tested on the sixth day by a properly certified laboratory for the presence of volatile organic chemicals.

     (d) The results of the test are submitted to and approved by the Division or the appropriate district board of health.

     3. Storage structures must be disinfected before being put into service for the first time and after being entered for cleaning, repair or painting. The disinfection must be conducted in accordance with American Water Works Association Standard C652, as adopted by reference in NAC 445A.6663. The disposal of any heavily chlorinated water that results from the process of disinfection must be coordinated with the Bureau of Water Pollution Control of the Division. Before the structure is placed into operation after disinfection, two samples of water in the structure, taken at least 24 hours apart, must indicate that any concentration of coliform bacteria in the structure meets primary standards.

     (Added to NAC by Bd. of Health, eff. 2-20-97; A by Environmental Comm’n by R194-08, 10-27-2009)