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and openings are secured for service. Grills or grates shall be at least 1/4 -inch wire mesh with minimum 2 square inch mesh openings and shall allow adequate free air passage. 3.07 DISINFECTION A. Upon completion of the coating and confirmation that the coating has been properly cured, the inside of the tank shall be thoroughly cleaned and disinfected by use of chlorine applied in a concentrated solution, sprayed over the entire surface and then washed down with clean water in accordance with the specifications of the Minnesota Health Department, and AWWA C652-02, Section 4.3.2: Chlorination Method 2. B. The disinfected surfaces shall remain in contact with the chlorine solution for at least 30 minutes. Then all disinfected surfaces, including the inlet and outlet piping and any drain piping, shall be washed and purged with clean water. Remove all chlorine solution and purge water from the interior. Following this, potable water shall be admitted. C. After chlorination and before the facility is placed in operation, water from the full facility shall be sampled and tested for coliform organisms in accordance with the latest edition of Standard Methods for the Examination of Water and Wastewater. If the sample is negative, then the facility can be placed into service. If there is a presence of coliform, repeat samples shall be taken until 2 consecutive samples are negative or the reservoir shall be redisinfected using the above specified method. D. Bacterial tests will be taken by an independent laboratory designated by the Owner. Initial tests will be paid for by the Owner. Any retesting required because of failure to meet the specified quality will be paid for by the Contractor. 3.08 MISCELLANEOUS A. Paint Thickness: Dry film thickness (D.F.T.) readings of the coating are taken to provide reasonable assurance that the specified minimum D.F.T. has been achieved. A minimum of 5 separate spot measurements shall be made over every 100 square feet in area. Each spot measurement shall consist of an average of 3 -gage readings next to each other no further than 6 inches apart. Each spot measurement must meet at least the specified minimum thickness. The single gage readings, however, making up the spot measurements are permitted to be no less than 80 percent of the specified minimum thickness. 3.09 CLEAN UP AND DISPOSAL A. After completion of the tank painting, the Contractor shall remove all excess materials, paint products, blasting sand, and debris of any kind caused by the Project. He shall leave the premises in a neat, clean condition, and shall restore all areas, such as driveways, grass, sod, etc., that have been disturbed by his operations to a condition equal to or better than that which existed when he started the Project. B. The Contractor shall at all times keep the premises free from accumulations of waste material or rubbish caused by his employees or Work. He shall clean-up abrasive material or rubbish on a daily regular schedule as directed by the Engineer. All unneeded construction equipment shall be removed from the Site and all damages, required expeditiously so that the adjacent property is inconvenienced as little as possible. C. During exterior sandblasting and coating operations, the Contractor shall provide adequate protection and containment to prevent damage to adjacent structures and property by his WATER TOWER REPAINTING © 2012 Stantec 1 193803415 09 91 55 - 10