(a) All water transfer equipment and any other equipment having the possibility of coming in contact with the bulk water shall be washed, rinsed, sanitized, and replaced as often as necessary to effectively maintain the sanitary quality of the bulk water.
(b) The bulk tank interior must be visually inspected by the hauler prior to the initial filling each day, and whenever potential contamination is suspected.
(c) The inside of the bulk tank must be cleaned and sanitized: - (i) Any time contamination has occurred or possibly occurred;
- (ii) After back siphonage of water has occurred from a receiving tank;
- (iii) When a visual inspection reveals sediment, rust, or foreign material inside the tank;
- (iv) After more than 30 days of non-use;
- (v) After repairs have been made to the inside of the tank;
- (vi) After filling with water from a source where a "boil order" has been imposed; and
- (vii) Upon receipt of unsatisfactory results from a routine bacteriological test of water drawn from the tank.
(d) Approved methods for sanitizing bulk tanks include: - (i) Manual (by brushing, spraying, or immersion) application of a sanitizing solution containing chlorine (200 ppm) or quartenary ammonium (200-400 ppm) directly to all interior tank surfaces, allowing a 30 minute contact time then followed by a potable water rinse;
- (ii) Filling the tank with a diluted (50 ppm) chlorine sanitizing solution and allowing it to sit in the tank for 24 hours. Approximately one gallon of bleach containing 5.25% sodium hypochlorite will make 1,000 gallons of a sanitizing solution with a concentration of 50 ppm. A chemical test kit must be used for verifying the concentration of sanitizers; or
- (iii) Steam contact application to the interior surfaces of the bulk tank.
(e) A spray bottle or tank sprayer containing either a chlorine (100-200 ppm) or quaternary ammonium (200-400 ppm) sanitizing solution shall be kept with the hauler at all times. - (i) Sanitizing solutions shall be applied as needed to pipe fittings, hose bibs, caps, tank openings and other possible points of contamination.
(f) Good hygiene shall be practiced by the hauler during filling, delivery and handling equipment including: - (i) Avoid touching the interior surfaces of hoses, clamps, fittings, and covers;
- (ii) Prevent the contamination or unnecessary handling of any surface inside a receiving tank; and
- (iii) Hand washing, use of disposable gloves, or the application of an alcohol-based gel-type hand sanitizer is required before handling any equipment surface that may come in contact with the bulk water.
010-12 Wyo. Code R. § 12-10