15. (1) On the day the structural stage of the well is completed, the person constructing the well shall ensure that, (a) any remaining debris is removed from the well; (b) the water in the well is dosed to a concentration of not less than 50 milligrams per litre and not more than 200 milligrams per litre of free chlorine and left undisturbed for a period of at least 12 hours; and (c) the water in the well is not used for human consumption until the steps required by subsections (2) to (7) are taken.  O. Reg. 372/07, s. 16. (2) A person who undertakes construction of a well that is being used or maintained for use for the purpose for which it was constructed or installs pumping equipment in a well shall ensure that as soon as possible after the construction or installation is complete, the water in the well is dosed to a concentration of not less than 50 milligrams per litre and not more than 200 milligrams per litre of free chlorine.  O. Reg. 372/07, s. 16. (3) Subsection (2) does not apply to the replacement of a pump that is installed above or adjacent to a well or in a well pit unless the replacement involves the removal of a well cover or well cap required by subsection 15.2 (6) or (7).  O. Reg. 372/07, s. 16. (4) A person referred to in subsection (2) shall ensure that, at least 12 hours and not more than 24 hours after the water is chlorinated, the well water is tested for free chlorine residual.  O. Reg. 372/07, s. 16. (5) If, according to a test under subsection (4), the concentration of free chlorine residual in the well water is less than 50 milligrams per litre or more than 200 milligrams per litre, the person referred to in subsection (2) shall ensure that the following steps are taken: 1. Water shall be pumped out of the well until the concentration of free chlorine residual in the well water is less than 1 milligram per litre. 2. The water in the well shall be dosed to a concentration of not more than 200 milligrams per litre of free chlorine. 3. At least 12 hours and not more than 24 hours after the water is dosed under paragraph 2, the well water shall be tested for free chlorine residual. 4. If, according to a test under paragraph 3, the concentration of free chlorine residual in the well water is less than 50 milligrams per litre or more than 200 milligrams per litre, the steps referred to in paragraphs 1 to 3 and this paragraph shall be repeated.  O. Reg. 372/07, s. 16. (6) A person who is required to ensure that steps set out in subsection (5) are taken shall ensure that, (a) subject to paragraph 4 of subsection (5), the steps are taken in the sequence in which they are set out in subsection (5); and (b) each step is taken as soon as reasonably possible.  O. Reg. 372/07, s. 16. (7) If, according to a test under subsection (4) or paragraph 3 of subsection (5), the concentration of free chlorine residual in the well water is 50 milligrams per litre or more but not more than 200 milligrams per litre, the person who is referred to in subsection (2) shall ensure that water is pumped out of the well until the concentration of free chlorine residual in the well water is less than 1 milligram per litre.  O. Reg. 372/07, s. 16. (8) No person shall, during a period between the chlorination of the water in a well by a person referred to in subsection (2) and the testing of the well water for free chlorine residual under this section, (a) disturb the well; or (b) use the well for any purpose.  O. Reg. 372/07, s. 16. (9) A person who is responsible for ensuring that well water is tested for free chlorine residual under this section shall ensure that, before the well is used as a source of water for human consumption, the well purchaser is given a written record of the test results.  O. Reg. 372/07, s. 16. (10) Subsections (4) to (9) do not apply to an alteration of a well if all of the following criteria are satisfied: 1. The alteration involves the urgent replacement or repair of a pump that unexpectedly failed. 2. No water supply is immediately available as an alternative to the water from the well. 3. The well purchaser provides the person who undertakes the alteration with written instructions to discontinue the disinfection process after complying with subsection (2).  O. Reg. 372/07, s. 16. (11) If, pursuant to subsection (10), subsections (4) to (9) do not apply to an alteration of a well, (a) the well purchaser shall ensure that, before the well water is used for any purpose, water is pumped from the well until no odour of chlorine remains in the well water; and (b) the person who undertakes the alteration shall retain the written instructions referred to in paragraph 3 of subsection (10) for two years.  O. Reg. 372/07, s. 16. (12) This section does not apply if the Director gives written approval to another method of disinfection and the approved method is complied with.  O. Reg. 372/07, s. 16. (13) This section does not apply to a minor alteration of a well.  O. Reg. 372/07, s. 16. (14) This section does not apply to a test hole, dewatering well or flowing well.  O. Reg. 372/07, s. 16. Venting