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foregoing procedures exactly for any reason , , modifications in the procedure shall be made as approved by the Engineer. In any event , the Contractor shall be responsible for the ultimate water tightness of the piping within the preceding requirements . 3 . 03 DISINFECTION A. The Contractor shall furnish and install suitable temporary connections to the piping , all necessary pressure pumps , hose , pipe connections , meters , gauges and other similar equipment, and all labor required , all without additional compensation for the disinfection of all required piping systems . Disinfection shall be conducted on the following systems : 1 . Water main piping and valves . Be Conform to AWWA Standards and as modified herein . C . Maintain disinfectant for a minimum of 8 hours in such a manner that the entire system will be filled with water containing a minimum chlorine concentration of 50 ppm at any point. D . After the disinfecting agents have been permitted to remain for the specified contact periods , the water lines , and valves shall be thoroughly flushed with water until the residual chlorine tests are less than 2 PPM in each instance . The determination of the amount of residual chlorine in the system shall be made at such points and in accord with standard tests by means of a standard orthotolodine test set. 3 . 04 BACTERIOLOGICAL SAMPLING A . It shall be the responsibility of the Contractor under this contract to perform the bacteriological testing required by the Florida Department of Environmental Protection and Indian River County to obtain clearance of the water main piping . The Contractor shall be responsible to disinfect and repeat testing as needed until clearance is obtained for all required plant systems . The Contractor shall be responsible to pay for additional water needed if the bacteriological testing must be repeated for the clearance of the ground storage tank . Be The piping systems require two (2) consecutive daily samples taken from the locations called out on the plans or as determined by the Engineer. The samples shall be taken at all the respective sample point locations . C . Sampling must be coordinated with Engineer and other construction activities so as to minimize re-sampling . D . Contractor shall submit schedule for bacteriological testing and pressure tests . E . The Contractor shall incur all costs needed to provide bacteriological clearance of the piping systems . 3 . 11 QUALITY CONTROL A . The laboratory and personnel collecting bacteriological samples shall be Florida State certified in accordance with FDEP requirements . Addendum #2 11 /8/2012 01025-36 Technical Specifications F:\Public Works\ENGINEERING DIVISION PROJECTS\1126 as South Co Park Multi Purpose Fields\Admim\bid documents\Contract Documents\Technical Specifications ADD #2.doc