Notwithstanding any other provisions of this Bylaw, no building or structure for residential use shall be constructed, reconstructed, altered or renovated, nor shall any mobile home or modular home be located within 30 m (98.4 feet) of the natural boundary of the Fraser, Pitt and Coquitlam Rivers, nor within 7.5 m (24.6 feet) of the inboard toe of a dyke adjacent to the above rivers, nor within 7.5 m (24.6 feet) of the natural boundary of any other nearby natural watercourse. If landfill is used to achieve the required elevation, no portion of the landfill slope shall be closer than the above distance(s) from the natural boundary, and the face of the landfill slope shall be adequately protected against erosion. Notwithstanding any other provisions of this Bylaw, any space below the habitable floor elevation must be crawl space that cannot have a height exceeding 1.5 m (5 feet) measured from the top of the crawl space finished floor to the underside of the floor ceiling or joist system above. Clauses (3) and (4) of this Section of the Bylaw shall not apply: (i) to a renovation of an existing building or structure used as a residence that does not involve an addition thereto. (ii) to an addition to a building or structure used as a residence that would increase the size of the building or structure by less than 25% of the floor area existing at the date of adoption of this Bylaw, except in regard to setbacks. (iii) to that portion of a building or structure designed or intended for residential use that is comprised of essentially non-habitable uses such as carport or garage, storage arcas, or workshops. (iv) to an addition to an existing building or structure used as a residence to be created by raising the existing residence and creating an area for non-habitable uses underneath, and in compliance with subsection (5) above.