BOH Agenda 032520 - Laserfiche WebLink

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a. Chlorination (1) Granular calcium hypochlorite shall be placed in the well in sufficient quantities to produce a chlorine residual of at least 100 parts per million (ppm) in the well. Stabilized chlorine tablets or hypochlorite products containing fungicides, algaecides, or other disinfectants shall not be used. Chlorine test strips or other quantitative test methods shall be used to confirm the concentration of the chlorine residual. (2) The disinfection of well water with calcium hypochlorite requires the water pH stabilized to less than 7.0 before the application. Use pH lowering and disinfection products in the manner that the manufacturer intends. b. The granular calcium hypochlorite shall be applied to the well through the top of the well and allowed to settle to the bottom. c. The water shall be recirculated to: (1) Distribute the chlorine throughout the water column of the well, and; (2) Wash down the well casing, pump column, and any other equipment above the water level in the well. 3. The chlorine solution shall stand in the well for a period of 24 hours or more. 4. The well shall be pumped until the system is clear of the chlorine before the system is placed in use. Prior to final chemical disinfection, contractors must remove foreign substances, such as grease, soil, sediment,joint dope, and scum from the well and near the wellhead. Pump installers must clean all pump parts before placing them into the well. The well must be disinfected with a chlorine compound at a concentration of no less than 100 mg/L (100 ppm) available. 5. Other materials and methods of disinfection may be used upon prior approval by the State and OCHD. History Note: Substitute for NCAC 02C.0111 Eff. July 1, 2008; amended eff. October 23, 2009;March 25, 2020 31