关于深度我email询问了city,得到答复是没有相关规定,但我觉得保险起见如果下面是石头的,还是尽量应该让他们挖到3尺。
Thank you for contacting the City of Ottawa. With regard to your inquiry, as per our City plans examiners, there are no regulations associated with fence posts.
Yours truly,
XXXXX
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