Area of modelling coverage
 14. (1) Subject to subsections (2) to (6), an approved dispersion model that is used for the purposes of this Part shall be used in a manner that predicts the concentration of the relevant contaminant at points of impingement separated by intervals of, (a) 20 metres or less, in an area that is bounded by a rectangle, where every point on the boundary of the rectangle is at least 200 metres from every source of contaminant; (b) 50 metres or less, in an area that surrounds the area described in clause (a) and that is bounded by a rectangle, where every point on the rectangle is at least 300 metres from the area described in clause (a); (c) 100 metres or less, in an area that surrounds the area described in clause (b) and that is bounded by a rectangle, where every point on the rectangle is at least 800 metres from the area described in clause (a); (d) 200 metres or less, in an area that surrounds the area described in clause (c) and that is bounded by a rectangle, where every point on the rectangle is at least 1,800 metres from the area described in clause (a); (e) 500 metres or less, in an area that surrounds the area described in clause (d) and that is bounded by a rectangle, where every point on the rectangle is at least 4,800 metres from the area described in clause (a); (f) 1,000 metres or less, in the area that surrounds the area described in clause (e).  O. Reg. 516/07, s. 10. (2) If an approved dispersion model is used for the purposes of this Part with respect to a property on which sources of contaminant are located and any point on the property boundary of the property is within 200 metres of any source of contaminant, the model shall be used in a manner that predicts the concentration of the relevant contaminant at points of impingement along the entire property boundary, and those points of impingement shall be separated by intervals of 10 metres or less.  O. Reg. 516/07, s. 10. (3) Subsection (1) or (2) does not apply if the approved dispersion model that is used is, (a) the ASHRAE method of calculation; (b) the SCREEN3 dispersion model described in paragraph 4 of subsection 6 (1); (c) the method of calculation required by the Appendix to Regulation 346; or (d) a dispersion model or combination of dispersion models that, pursuant to subsection 7 (3), is deemed to be included in references in this Part to approved dispersion models, if the dispersion model or combination of dispersion models is not capable of predicting the concentration of the relevant contaminant at points of impingement described in subsection (1) or (2), as the case may be.  O. Reg. 516/07, s. 10. (4) If an approved dispersion model is used for the purposes of this Part, it is not necessary to use the model in a manner that predicts the concentration of the relevant contaminant at a point of impingement if the distance from the property on which the sources of contaminant are located to that point of impingement is greater than the distance from the property on which the sources of contaminant are located to the point of impingement where, according to the model, the concentration of that contaminant would be highest.  O. Reg. 516/07, s. 10. (5) With respect to points of impingement on structures that are above ground level, an approved dispersion model that is used for the purposes of this Part shall be used in a manner that predicts the concentration of the relevant contaminant at a sufficient number of points of impingement on those structures to identify any points where discharges of the contaminant may result in an adverse effect or a contravention of section 19 or 20.  O. Reg. 516/07, s. 10; O. Reg. 507/09, s. 13 (1). (6) Despite subsections (1) to (5), the Director may give written notice to a person who discharges or causes or permits the discharge of a contaminant requiring that an approved dispersion model that is used for the purposes of this Part be used in a manner that predicts the concentration of the contaminant at points of impingement described in the notice.  O. Reg. 516/07, s. 10; O. Reg. 507/09, s. 13 (2). (7) Before the Director gives a person a notice under subsection (6), the Director shall give the person a draft of the notice and an opportunity to make written submissions to the Director during the period that ends 30 days after the draft is given.  O. Reg. 516/07, s. 10.