Section R. 325.11117 - Storage tanks; disinfection and water analysisRule 1117.
(1) Proper techniques shall be followed during construction to keep storage tanks clean and dry.(2) A finished water storage tank shall be disinfected before initial use and after any internal maintenance or repair activity.(3) Before placing a storage tank into service all of the following shall occur: (a) Before collection of each bacteriologic sample, heavily chlorinated water shall be flushed from the tank, drain piping, riser and all other appurtenances until the chlorine measurements in the water leaving the tank is absent or no higher than that normally maintained in the storage tank.(b) Not fewer than 2 consecutive water samples for bacteriological analysis shall be collected 24 hours apart unless an alternate interval is approved by the department.(c) An analysis shall not indicate the presence of coliform. Analyses for other contaminants may be required if the department has reason to believe that these contaminants are present.Mich. Admin. Code R. 325.11117
1979 AC; 1991 AACS; 2009 AACS