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PLUMBING PIPING SYSTEMS Section 15400 15-1207 Building and Health department codes. This procedure shall be performed by a Licensed Contractor trained in the disinfection of water systems or by a state certified Water Operator with a minimum of a D-1 license. 2. Preliminary Preparation: a. Locate the injection point. Install an injection hose bib to the system at a point within 10'-0" of its junction with the water supply line. When project is complete, with all fixtures connected and operable and ready for use and when, by test, the system is proved to be free from leaks, it shall be thoroughly flushed by fully opening every outlet and operating every fixture until clear water flows from all of them. Take a Sample, test for Free chlorine content and record it on the work sheet. (1) Use a UR (low range) Disinfection test strip or a chlorine meter. A Normally reading will be 2mg/L or less. This is the "Bench Mark" reading. 3. Disinfecting Agent: a. The chlorine shall be a registered product with Cal -EPA for use in California in potable water lines, such as Bacticide, Cal -EPA Registration No. 37982-20001. Use liquid Sodium Hypochlorite conforming to ANSI/AWWA B300. 4. Disinfecting Procedure (Chemical Pump Method): a. Connect the chemical pump to the injection hose bib. If existing pressure exceeds 50psi use a DP Disinfection Backflow / Regulator Injection Assembly. b. With system completely full of water and supply valve open, adjust every faucet of system so that a trickle of water flows from each.. Find the furthest fixture and trickle at a higher rate of speed until you obtain your first reading. Then work backwards. C. Inject disinfectant until a test at each branch outlet shows a chlorine residual concentration of 50 parts per million (ppm). d. Close all outlets and valves. Close Fresh water hose bib. Shut off pump. Close injection hose bib. Maintain condition for 24 hours and chlorine residual of at least 25 ppm must be retained in system for this 24 hour period. If, after 24 hours, tests indicate that chlorine residual concentration has decreased below 25ppm. The disinfection procedure must be repeated until an approved result is obtained. e. When the above procedure has been completed, flush out entire system with fresh water until a test at any outlet shows a residual of not more than the original "Bench Mark" readings taken in the preliminary preparation. (1) When flushing, pay attention to any special requirements. Don't flush highly chlorinated water into storm drains, creeks, rivers or septic tanks. De -chlorinate the discharge water with Ascorbic Acid, F. Chemical and bacteriological tests shall be conducted by a state -certified laboratory and approved by the local authorities having jurisdiction. G. Submit written report to Health Department as required by State Regulations. Provide a copy of report to Architect prior to completion of project. 12