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Begin by measuring to determine the location of the fence posts and marking each point with spray paint. The depth of the holes will vary, but leave at least four inches of clearance on each side of the post. Since the posts are 4x4, the added four inches on each side will require holes measuring 12" x 12".
Note: Do not space holes more than six feet apart, or the stability of the fence may be compromised.
Once everything is measured, start digging. Check with local building codes for regulations on the depth of fence post holes, and be sure to check with local utility companies before digging to avoid damaging buried cables.
When the holes are ready to go and excess dirt has been removed, mix up the concrete. Plan on using about half of a 90-pound bag for each post. Make sure the concrete is churning every couple seconds or it will become hard on the bottom and dry on the top.
Place each post in a hole and pour the concrete in the hole, mixing it with a shovel. Fill all the way to the top of the hole, or leave a few inches and backfill it with soil later to hide the concrete.
When the concrete has thickened to the point of holding each post in place, secure a fence post level around the post to level it out. Stake it so that it remains level while the concrete cures. Let the post cure overnight, then backfill with soil.
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