14.4 (1) If a new well is constructed by any method, other than a method described in section 14.1, 14.2 or 14.3 or by the use of a jetted point, the person constructing the well shall ensure that the well is constructed with a diameter that, from the ground surface to a depth of at least the full depth of the well or six metres, whichever is less, is at least 7.6 centimetres greater than the outside diameter of the casing that will be used.  O. Reg. 372/07, s. 15. (2) If a new well is constructed by any method, other than a method described in section 14.1, 14.2 or 14.3 or by the use of a jetted point, the person constructing the well shall comply with section 14 by ensuring that the following rules are complied with: 1. If a well screen is installed, i. the annular space shall be filled, from the bottom of the well to at least the top of the well screen with clean, washed gravel or sand that is, A. deposited during or after placement of the well screen and casing, or B. developed, after placement of the sealant referred to in subparagraph ii, by surging water through the well screen to remove the adjacent fine grained soils, and ii. any remaining annular space shall be filled with suitable sealant, upward from the top of the gravel or sand referred to in subparagraph i to the ground surface. 2. If no well screen is installed, the annular space shall be filled with suitable sealant from the bottom of the casing upward to the ground surface. 3. The top of the gravel or sand referred to in paragraph 1 shall not be closer than six metres to the ground surface, unless the only useful aquifer available necessitates a shallower well, in which case the top of the gravel or sand shall not be closer than 2.5 metres to the ground surface. 4. The sealant referred to in paragraphs 1 and 2 shall be continuously deposited by forcing sealant through a tremie pipe, with the bottom end of the pipe immersed in the rising accumulation of sealant. 5. If the sealant referred to in paragraphs 1 and 2 contains cement, i. it shall be allowed to set according to the manufacturer’s specifications or for 12 hours, whichever is longer, and ii. if, after setting in accordance with subparagraph i, the sealant has settled or subsided, it shall be topped up to the original level.  O. Reg. 372/07, s. 15. (3) Subsection (1) does not apply to a well if, (a) the well is constructed with a diameter that, from the ground surface to a depth of at least the full depth of the well or six metres, whichever is less, is at least 5.1 centimetres greater than the outside diameter of the casing that will be used; (b) the suitable sealant used to comply with subsection (2) has a maximum particle size that will not be subject to bridging; and (c) proper alignment is ensured by, (i) in the case of a well constructed using a cable tool rig, the use of a breakaway guide for centering the casing that does not impair the quality of the water with which it comes into contact and that is placed two metres above the bottom of the casing, or (ii) in the case of a well constructed using a rotary rig, the use of centralizers located below a depth of six metres.  O. Reg. 372/07, s. 15. (3.1) Paragraph 3 of subsection (2) does not apply to a well that is a test hole or dewatering well and that is made where, at a depth of less than 2.5 metres below the ground surface, there is ground water, but the person constructing such a well shall ensure that, (a) the top of the well screen is placed below the ground surface, leaving sufficient space for the suitable sealant referred to in clause (b); and (b) the annular space from the top of the gravel or sand to the ground surface is filled with suitable sealant to prevent the entry into the well of surface water and other foreign materials. O. Reg. 461/19, s. 5 (1). (4) Subsections (1) to (3.1) do not apply to a test hole or dewatering well if abandonment of the test hole or dewatering well is scheduled to take place not later than 180 days after completion of the structural stage of the test hole or dewatering well.  O. Reg. 372/07, s. 15; O. Reg. 461/19, s. 5 (2). Annular Space — Wells with a Well Pit