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potable water and as defined hereinbefore shall be disinfected before placing into permanent service. The procedures shall conform to the requirements herein and the December 2006 01721 -3 06 -5723 requirements of any governing agency having jurisdiction. b. Before disinfection of the pumps, flush all foreign matter from the unit and provide all necessary hoses, temporary pipes, bulkheads, plugs, etc., as required to dispose of the flushing water without damage to adjacent equipment or material. c. The disinfecting solutions shall be prepared in accordance with the procedures described for in Paragraph Tanks and Water Holding Structures hereinbefore and the solution shall have a minimum free chlorine residual of 200 ppm. d. The disinfecting solution shall be injected into the pump and associated piping and shall be circulated for a minimum 2- hour period of time. At the end of the t -hour period, the solution shall have a strength of at least 100 ppm of residual chlorine. e. Operate all valves and /or pump appurtenances during disinfection to ensure that the disinfecting solution is dispersed into all parts of the pumps and lines. f. Do not place concentrated quantities of commercial disinfectants in the equipment before they are filled with water. g. If the disinfecting solution contained in the pumps has residual chlorine concentration less than 100 ppm after the 2- hour retention period, the pump shall be recleaned, have disinfecting solution reapplied and retested at the Contractor's sole expense, until a satisfactory test result is obtained. h. After disinfection, flush the water from the pumps until the water through the units is chemically and bacteriologically equal to the permanent source of supply. 4. Testing: a. After tanks, equipment, or pipelines have been cleaned, disinfected, and refilled with fresh water from the plant, the samples will be analyzed by an approved lab for conformance to bacterial limitations for public drinking water supplies. As a minimum, two samples on each of 2 consecutive days from each separable part and /or every 2,000 feet of pipeline will be obtained and analyzed by standard procedures and as outlined by the state and local regulatory agencies. Sampling points will be representative. If the minimum sample as required above are not bacterially clear, the disinfectant testing operation shall be repeated at the Contractor's expense. b. All tanks and water holding structures shall be disinfected and tested. December 2006 01721 -3 06 -5723