Section Env-Dw 304.06 - Tank and Water Sanitation Practices(a) Prior to loading water from an approved source, the bulk water provider shall: (1) Visually inspect the tank and all hoses, pipes, pumps, and other handling equipment for rust or sediment and, if any is found, remove it by rinsing and flushing; and(2) If the immediately prior load was anything other than water from an approved source, clean and disinfect the tank and all hoses, pipes, pumps, and other handling equipment not replaced pursuant to Env-Dw 304.05(a)(5) using the materials and methods described in (f) and (g), below.(b) All surfaces that come into contact with water during transport shall be:(1) Made of a smooth, impervious, nonabsorbent, corrosion-resistant and non-toxic material such as stainless steel; and(2) Maintained in good repair.(c) Tanks shall be of the type that can be closed to exclude all foreign matter.(d) Vents on tanks shall be protected to prevent contamination of the bulk water during filling and emptying.(e) Bulk water shall be stored, loaded, transported, and unloaded in a manner that prevents contamination.(f) Prior to using a tank to haul water from an approved source to a PWS where the immediately prior load was anything other than water from an approved source, the tank shall be cleaned using the following procedures:(1) All debris in the tank shall be rinsed and flushed; and(2) The tank shall be disinfected using one of the following methods: a. Using a chemical sanitizer having an equivalent bactericidal action to 50 milligrams per liter (mg/l) available chlorine for 2 minutes at 57°F as an immersion or circulating solution to sanitize the entire tank volume; orb. Using an ozone water solution with a concentration of 0.1 mg/l of ozone for 5 minutes as an immersion or circulating solution to sanitize the entire tank volume.(g) Liquid sodium hypochlorite bleach used to comply with (2)a., above, shall: (1) Contain no additives such as scent or cleaning enhancers; and(2) Be mixed in the proportions identified in Table 304-1, below: Table 304-1 Amount of Liquid Sodium Hypochlorite having 8.25% Available Chlorine Per Volume of Water to Obtain Resulting Solution
Amount of Water[ARROW] Resulting Solution Concentration (mg/l) [DOWN ARROW] | 50 gallons | 500 gallons | 1,000 gallons | 7,000 gallons |
1 | 0.5 teaspoon | 4.7 teaspoons | 3 tablespoons | 1.33 cups |
50 | 0.5 cup | 1 quart plus 1.0 cup | 2 quarts plus 1.75 cups | 4 gallons plus 1.0 quart |
100 | 1.0 cup | 2 quarts plus 1.75 cups | 3 gallons plus 3.5 cups | 8.5 gallons |
N.H. Code Admin. R. Env-Dw 304.06
Amended by Volume XXXVIII Number 02, Filed January 11, 2018, Proposed by #12444, Effective 1/1/2018, Expires 1/1/2028.