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I� <br />L� <br />i <br />r; <br />it <br />tests shall be considered the responsibility of the Contractor, and <br />reapplication of disinfectants and retesting shall be at the Contractor's sole <br />expense. <br />B. Prior to application of disinfectants, the tanks, equipment or pipelines shall <br />be thoroughly cleansed of loose and suspended material. Pipelines shall <br />be flushed until clear of suspended solids and color. The Contractor is <br />expected to exercise caution in construction of the facilities to minimize <br />retention of debris and subsequent excessive flushing requirements. The <br />Contractor shall ensure that the water he utilizes is suitable for flushing and <br />disinfecting the facilities. <br />C. Disinfection operations shall not be commenced until all hydrostatic testing, <br />pressure testing, functional and operational testing for the associated <br />structures, piping, and pumping system have been completed satisfactorily. <br />D. The following methods are normally adequate for disinfection and are <br />generally acceptable: <br />1. Pipelines: <br />a. See Section 02600 - Yard Piping. <br />b. Pipelines to be disinfected include all piping downstream of <br />the well pumps except drain piping. <br />2. Tanks and Water Holding Structures: <br />a. Tanks shall be disinfected by one of the following methods: <br />1) A solution containing 200 ppm of available chlorine <br />shall be sprayed or brushed onto the interior surfaces <br />of the tank and allowed to remain 3 hours or until dry <br />before being rinsed off. A solution containing 200 ppm <br />of available chlorine can be prepared by diluting a 1 <br />percent sodium hypochlorite solution to 50 parts of <br />water. <br />2) The tank shall be filled with water containing 50 ppm of <br />available chlorine. This solution should be held in the <br />tank for at least 3 hours before being replaced with <br />fresh water. <br />3) The tank shall be filled with chlorinated water sufficient <br />to produce a chlorine residual of 5 ppm after a <br />retention period of 24 hours. In most instances, an <br />initial application of 25 ppm should produce a chlorine <br />residual of 5 ppm after 24 hours. After 24 hours, the <br />chlorinated water should be drained and the tank filled <br />with raw well water. <br />b. Disposal of chlorinated water shall be in accordance with all <br />applicable regulations. <br />3. Pumps and Other Equipment: <br />a. The various pumps and equipment intended to handle <br />December 2006 <br />01721 -2 06 -5723 <br />