Kyle Elite Concrete works as a concrete contractor in Garfield, TX on driveways, approaches, pads, steps and slab work, and the honest opening statement about this place is that it will not generalize. Twelve square miles here carry thirty-two distinct soil map units, and no single one of them accounts for even a fifth of the ground.
That is unusual, and it changes how an estimate has to be built. In most places we can name the likely condition before driving out and then confirm it on site, because one soil covers most of the map. Here the confirmation is the whole exercise, because the odds of guessing right are genuinely poor.
The good news is that nothing here is a rock-excavation problem. Not one leading component carries a lithic or paralithic restriction within a meter, so digging is priced by which of several unrelated soils the trench opens in rather than by how deep the machine gets before it stops.
No Single Soil to Plan Around
Thirty-Two Map Units in Twelve Square Miles
A 192-point grid clipped to the place boundary and queried against the Travis County survey area returns thirty-two distinct map units. By leading component, Bergstrom takes 17.7 percent of the points, Houston Black 15.1 percent and Chaney 10.9 percent, with Heiden and Wilson at 8.3 percent each.
Below those come Yahola at 6.2 percent, Tinn at 5.2 percent, Ships at 5.2 percent, Weswood at 4.7 percent, Ferris at 4.2 percent, Heaton at 3.6 percent and Crockett at 3.1 percent. The tail runs long, with units like Hornsby gravelly loamy sand, Altoga, Burleson and Oakalla each at around half a percent, and every one of those is a different subgrade.
Five Soil Orders Inside One Place
By soil order the split runs Vertisols 39.1 percent, Alfisols 26.6 percent, Mollisols 18.2 percent, Entisols 7.8 percent and Inceptisols 6.2 percent, with about 2 percent open water. Two thirds of the ground is therefore either high-movement clay or a sandy-surfaced soil sitting over a clayey subsoil.
Those two conditions want opposite details from each other. One asks for reinforcement that holds a slab together through seasonal movement, and the other asks for a base built to deal with a layered profile and water that perches on the denser material below. Building either detail on the wrong ground wastes money in a different direction.
Runoff That Is Not Uniform Across a Subdivision
Hydrologic soil groups split four ways here: D at 43.8 percent of points, B at 27.1 percent, C at 21.4 percent and A at 7.8 percent. That range is wider than most whole counties manage, and it means runoff behavior is not consistent across a single subdivision, let alone across the place.
For flatwork the practical effect is that drainage design cannot be copied from the last job down the road. Where the water goes, how fast it leaves and whether it sits under a slab all change with the map unit, so those decisions get made per lot rather than per neighborhood.
Looking for concrete-contractor closer to Hornsby Bend? See Concrete-Contractor in Hornsby Bend.
Ships Clay at the Extreme End
Sixty-One to Sixty-Eight Percent Clay
Ships clay is the far end of the range and it is mapped here on about 5 percent of the points. It runs 61 to 68 percent clay through the profile, with a plasticity index of 34 to 40, a liquid limit of 61 to 67 and linear extensibility of 8.2 to 11.2 percent, at a saturated hydraulic conductivity of 0.21 micrometers per second.
That is a Chromic Hapludert on nearly level ground, rarely flooded, and it is about as demanding a subgrade as this area offers. Both halves of the problem are present at once: the ground moves substantially with moisture, and water reaching the base underneath has effectively nowhere to drain to.
Houston Black, Heiden and Ferris Alongside It
Houston Black takes 15.1 percent of the points and carries a plasticity index of 44 to 45 with a liquid limit of 70 to 71 at 54 to 55 percent clay, with linear extensibility of 12 percent and no restrictive layer recorded to 203 centimeters. Heiden runs a plasticity index of 40 to 45 with linear extensibility of 10 to 12.2 percent.
Ferris spreads wider still, from a plasticity index of 45 to 59 with linear extensibility anywhere from 7.5 to 17 percent. Between them these clays account for a large share of the place, and on any of them reinforcement is doing real structural work rather than satisfying a drawing.
Bergstrom, the Largest Component, Which Is Mild
The single largest component is none of those. Bergstrom silty clay loam and silt loam take 17.7 percent of the points and are Cumulic Haplustolls in hydrologic group B, carrying a plasticity index of only 17 to 19 at 19.5 to 31.5 percent clay, with linear extensibility of 4.5 percent and no restrictive layer to 203 centimeters.
Its saturated hydraulic conductivity is 9.0 micrometers per second, which is roughly forty times what the heavy clays here manage. So the most common ground in the place is also some of the easiest to build on, and treating the whole place as heavy clay would overbuild a sixth of it.
The Alfisol Quarter, Which Behaves Nothing Like It
Chaney, and a Layered Profile
Chaney fine sandy loam takes 10.9 percent of the points and is an Oxyaquic Paleustalf in hydrologic group C. Its plasticity index ranges from 4 at the surface to 33 in the subsoil, with clay from 15 to 42.5 percent, but linear extensibility of only 1.5 to 4.5 percent through the whole profile.
That spread inside one soil is the point. Quoting the subsoil plasticity index alone would describe ground that heaves seasonally, and the movement measurement says it does not, while quoting the surface figure alone would describe loam that a base can simply be built on.
Why Layered Ground Is a Different Problem
A sandy-surfaced soil over a clayey subsoil is a differential-support problem rather than a heave problem. The top foot compacts and drains much like loam, while the denser layer that governs water movement sits below it, so a slab bears on one material and is affected by another.
Wilson clay loam adds 8.3 percent as an Oxyaquic Vertic Haplustalf at a plasticity index of 16 to 39 and linear extensibility of 2.8 to 7.5 percent, and Crockett another 3.1 percent as a Udertic Paleustalf. Each wants its base built for the layering rather than for an average of the two horizons.
Yahola, at the Other Extreme Again
Yahola very fine sandy loam takes 6.2 percent of the points and sits in hydrologic group A, with a plasticity index of 4 to 5 and a saturated hydraulic conductivity of 28 micrometers per second. That is free-draining river sand, roughly a hundred and thirty times the conductivity of the heaviest clays in the same twelve square miles.
Having both extremes inside one small place is exactly why we will not quote this ground from a map alone. The difference between the best and worst subgrade here is larger than the difference between most towns, and it is not visible from the road.
How to Bid Ground That Will Not Generalize
Flood Mapping Carries Real Weight Here
Federal flood mapping puts 33.3 percent of the sampled points inside a Special Flood Hazard Area, split 29.2 percent Zone AE and 4.2 percent Zone A, with a further 15.6 percent in the shaded 0.2 percent annual chance category. Nearly half the place therefore sits inside some mapped flood hazard area.
The distinction between the two zones is practical rather than academic. Base flood elevations are published for Zone AE and not for Zone A, so on the AE ground a slab or pad elevation is a number somebody can look up, and on the Zone A ground it is not, which lands directly on the schedule.
Three Roads, Three Permit Answers
An approach onto state right-of-way puts the permit with TxDOT, an approach onto a maintained county road stays with the county, and a driveway onto an unmaintained or unaccepted road gets no county permit at all. Three different answers on three kinds of road inside the same twelve square miles.
There is no municipal flatwork permit here because there is no municipality, so the question is a county one throughout. A county approach takes framing, pre-pour and final inspections, and failing to call for the required pre-pour inspection may result in a notice to remove and replace.
What the Work Actually Looks Like
Two thirds of the housing stock here is manufactured rather than site-built, which changes what flatwork is wanted. Pads, piers, steps, ramps, carport and shed slabs and approaches serving lots that never had a garage make up much more of the work than attached garage floors do.
With 754 units spread across twelve square miles, the private drive between the county right-of-way and the house is often long, so the length problem here sits behind the approach rather than in it. Foundation-stage inspection before the placement of concrete still applies to new residential construction, with the builder engaging the qualified inspector and failure to notify the county treated as a criminal misdemeanor.
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