S-2.1, r. 4 - Safety Code for the construction industry

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6.5.6. During the freezing and thawing period of the soil, the ice and snow shall be removed and the frozen soil shall be covered with a layer of gravel or sand dust before the sills are installed. The soil shall be:
(a)  protected against a possible thaw; or
(b)  thawed completely before undertaking the works.
R.R.Q., 1981, c. S-2.1, r. 6, s. 6.5.6.