4 Every location for a dredging lease shall be marked out by two posts placed on the margin of such river, above highwater mark, as follows:
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(a) the No. 1 post shall be at least four feet above the surface of the ground located at the upstream end of the area to be covered by the lease and shall be a post not less than four inches in diameter, mounded to a height of two feet, such mounding to be conically shaped and having a diameter at the base of not less than three feet, and this post shall be faced on the downstream side, which facing shall contain the following inscription legibly marked thereon:
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