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Digging Gate Post Holes Near Marked Lines by Hand

By georgetown metal gates files

Once the utility marks are down, a gate post hole in Georgetown may be dug by machine only outside the tolerance zone around each mark, and inside that strip it must be dug by hand. The strip is commonly two feet on either side of the marked line. Hand digging near a mark is slow, but it is the way an owner finds the line before the tool does, and it is the method the law expects. Done carefully, it is also not hard.

The tolerance zone

A locate mark is an approximation. Locators work from records and electronic tools, and both can be off by a little. The tolerance zone gives the line room for that error. Inside the zone, power augers, backhoes and mechanical diggers stay out. Hand tools such as a shovel, a post hole digger and a probe are allowed. Texas rules set the zone, and the exact distance should be confirmed with the 811 ticket or the utility.

Tools for the job

• A hand post hole digger for the first foot or two of each hole.
• A round point shovel and a trowel for careful work near a line.
• A thin steel probe rod, or a soft digging tool made of non conductive material, to feel for a pipe or a duct.
• A tape and a small level.
• Gloves, eye protection and boots.
• A plastic sheet for the spoil, so soil can be put back in order.

The sequence

Start at the edge of the tolerance zone and work toward the mark. Open a small pit with the shovel and trowel, exposing the line rather than guessing its depth. Probe gently, not with force. Once the line is seen, measure its depth and its distance from the planned post position. Then move the post hole as needed, keeping the full width of the hole outside the strip around the line.

For a post that must stand inside the strip, the hole is dug entirely by hand. Dig in thin layers, probing at each layer. Stop at once if a color, a marker tape or a warning strip appears. Warning tape is often buried a foot or so above a line and is a signal to proceed with extra care.

Reading the surprises

Lines are not always where they are marked. A mark may be off by a foot, and a service line may turn or branch. Concrete encasement, sand bedding or a conduit bundle can show up. If something unexpected appears, stop and identify it before digging further. A call to the utility, with the ticket number, can bring a locator back to the site.

Depth of a gate post hole

A post hole for a gate is typically deeper than one for a fence panel, commonly around three feet for a swing gate post, since the post carries weight and sideways load. Georgetown's clay soils swell and shrink with moisture, and limestone close to the surface can limit depth in places. In rock, a fabricator may drill rather than dig, and drilling is a machine operation that must stay outside the tolerance zone, or be replaced by a different footing design in it.

If the hole hits rock

Limestone and caliche are common across Williamson County. A hand digger will not get through them. If rock is met inside a tolerance zone, stop and talk to the fabricator. Options include moving the post, using a shallower footing with a wider base, or a surface mounted plate set into drilled anchors. Do not bring in a machine to chip rock near a marked line without the utility's agreement.

Spoil and backfill

Keep soil from near the line separate so it can be returned in layers. Backfill around a footing is compacted gently, with no rocks or debris pressed against a line. If concrete is poured near a line, keep it away from direct contact with pipe or cable, and never pour concrete on a line without the utility's approval.

If a line is struck

Stop immediately. Keep everyone back. If gas is involved, leave the area on foot, call 911 from a safe distance and then the gas utility. For electric, stay well clear and treat anything metal nearby as live. For water, shut off the equipment and call the utility to turn the water off at the valve. Notify 811 of the damage. Do not cover or hide a damaged line.

After the hole is dug

Photograph exposed lines with a tape beside them before backfilling, and record the depth and distance. Keep the photos with the ticket. A record of what was found helps with future work on the lot.

Hand digging near a marked line takes patience, and in Georgetown it is the way a gate gets built without a call to the repair crew.

Pacing the work

Hand digging is slow compared with an auger, and a crew that plans for it finishes sooner than one that is surprised by it. A single hole inside a tolerance zone can take an hour or more in Georgetown's clay, and longer in caliche. Allow time for each hole, and dig the holes outside the strips first so the crew keeps moving.

Soil conditions

Wet clay sticks to tools and slumps into the hole, and dry clay can be hard as brick. Limestone shows up as white or tan chunks and layers. A bar and a small pick help break rock by hand, though they should be used well away from a marked line. If water seeps in, the hole may be near a sprinkler or a water service, which is a reason to stop and check.

Keeping a record

Note the date and time of each dig, the weather, the depth reached and anything found. A small notebook or a phone photo log is enough. If a utility asks later what happened at the site, the record is the answer.

Working in a team

Assign one person to watch the hole and one to dig. The watcher can see a color change or a warning tape sooner than the digger can. Agree on a word that means stop at once.