§ 74-170. Disinfection.

(a)

After the backfill has been completed, the contractor shall disinfect the pipeline in accordance with the provisions of American Water Works Association Standard C601-68 and the provisions therein specified.

(b)

Prior to disinfection, the pipeline or valved section thereof, shall be flushed at a minimum flow velocity of 2½ feet per second. Following full development of flow, flushing shall continue until the discharge runs clear or until the village shall direct flushing operations to cease. In no event shall the duration of flushing be less than ten minutes. Water used in flushing the pipeline shall be introduced into the pipeline at a point of connection with the existing distribution system designated by the village.

(c)

After flushing, the continuous feed method described in AWWA C601-68 shall be used to disinfect the pipeline or valved section thereof. Water used in disinfecting the pipeline shall be introduced into the pipeline through the pressure test connection made under the provisions of section 74-167.

(d)

Bacteriological samples shall be collected from the pipeline on two successive days following disinfection and final flushing. All samples shall be collected by the village and transported to the county health department laboratory for analysis. If either sample shows the presence of coliform organisms, the contractor shall repeat the disinfection procedure.

(e)

If valved sections of the pipeline are disinfected separately, each such section shall be considered a separate pipeline for disinfection and flushing a separate pipeline for disinfection and flushing until disinfection of the upstream section has been satisfactorily completed as determined by bacteriological analysis.

(Code 1974, § 21-79)