A. The Contractor shall disinfect all lines carrying potable water.
B. The Contractor shall furnish all equipment and materials necessary to do the work of disinfecting, and shall perform the work in accordance with the procedure outlined in the AWWA Standard for Disinfecting Water Mains.
C. The dosage shall be not less than 10 ppm after a contact period of not less than 24 hours. Calculation of the required dosage shall be submitted for approval to the Water Department prior to chlorine injection. Injected chlorine shall remain in the mains less than 72 hours.
D. After treatment, the main shall be flushed with clean water until the residual chlorine content does not exceed 0.2 ppm.
E. During the disinfection period, care shall be exercised to prevent contamination of water in the existing mains. No valves shall be operated without the knowledge and permission of the Water Department.
F. The Contractor shall dispose of the water used in disinfecting and flushing in an approved manner.
G. The Contractor shall provide, as an affidavit of compliance, bacteriological test results certifying the water sampled from the water main to be free from coliform.
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