The Ontario Building Code | Site Evaluation
18.104.22.168. Site Evaluation
(1) A site evaluation shall be conducted on every site where a new or replacement sewage system is to be installed.
(2) The percolation time shall be determined by,
(a) conducting percolation tests, or
(b) classifying the soil according to one of the following methods,
(3) Where the percolation time is determined by a percolation test, there shall be a minimum of 3 locations selected, suitably spaced to accurately evaluate the leaching bed area, with the highest percolation time of the tests being used.