A road is built from the bottom up, and the bottom is the part nobody sees once the pavement is down. Road subgrade preparation shapes and strengthens the soil under asphalt or concrete paving, so that wheel loads spread across it evenly and moisture does not soften it. A subgrade that is uniform, properly compacted and well drained can carry traffic for many years. One with a single soft stretch will show a rut, a pothole or a heave long before the design life is reached.
On Midland-area projects the road in question may be a public street, a service road around an industrial plant, a haul route to a yard or the drive lanes of a commercial development. The steps are the same: strip, cut and fill to the subgrade elevation, treat or replace weak areas, compact, proof roll and release to the base crew. We coordinate the earthwork partners and testing firm, and we link their work to the paving schedule so the base is placed while the subgrade is still in the condition the engineer approved.
Subgrade timing against the paving crew
Paving crews and plants have their own schedules, and subgrade completion has to arrive before they do. We work backward from the paving date: base placement, subgrade release, final proof roll, compaction testing and the cut and fill that precedes them. The sequence is shown on a single page so every party can see where the critical path lies.
Roads are long, so we release them in segments. A stretch that passes its proof roll can receive base while the next section is still being compacted. That keeps the base crew busy and reduces the time that an accepted subgrade sits exposed to weather and traffic. If rain arrives, the segments that have not yet been covered are rechecked before paving continues.
Coordinating partners along the alignment
Road work involves more trades than a building pad. Clearing, grading, utility crossings, drainage structures, treatment, compaction, testing and survey all touch the alignment. We coordinate trade partners for utilities and earthwork, set the order of crossings and make sure that pipe installed under a future road is backfilled and tested before subgrade work starts over it.
Concrete trade partners place and finish concrete, which is relevant where the road section includes concrete pavement, curb or gutter, and the pavement itself is the subject of our concrete paving work. We prefer to hear from the placing crew about what they need from the subgrade, because they will be the ones working on it. Daily notes track the status of each segment so the owner's rep sees progress without walking the line.
What the subgrade package covers
The scope normally includes clearing, stripping, cut and fill to the subgrade profile, proof rolling, removal of soft areas, moisture conditioning, compaction and density testing. For weak soils, the engineer can specify stabilization using lime or cement, addressed in lime and cement soil treatment, or for geotextile and base reinforcement.
Edges and drainage get attention too. Side ditches, culvert crossings and curb lines are set in the same pass, since water that stands against the subgrade shortens the pavement's life. Utility crossings are settled first, since a trench cut through an accepted subgrade creates exactly the soft line the proof roll was meant to eliminate. The next layer, asphalt paving base preparation, begins as soon as the subgrade is released.
What changes the subgrade price
Length, width, soil type, depth of cut and fill, treatment and testing frequency all affect cost. A uniform road on good soil may need little more than shaping and compaction, while one that crosses soft ground may require removal, treatment or reinforcement. Haul distance for imported material is also a big variable.
We separate quantities by segment so the owner can see where money is going and can compare options. Weather days, retesting and traffic control add to the total. A long road also multiplies small inefficiencies, such as a water truck that has to travel far to refill, so we note the nearest water source in the estimate. Public owners and utilities who work through municipal and public works channels usually ask for unit prices with clear quantity limits, and we prepare them that way.
Roads that serve an energy economy
Midland County covers 902 square miles, with Midland as the county seat and neighbors that include Martin, Glasscock, Upton, Ector, Andrews and Reagan counties. Much of that territory is crossed by haul roads serving yards, plants and pads, and the loads on them are heavy and repeated. The service-yard areas north and west of Midland are typical.
Aviation adds its own requirements. The airport has four asphalt runways, the longest 9,501 feet by 150 feet, and in April 2025 the Midland City Council approved agreements for a radio-frequency testing laboratory there, with 50 new jobs and a $3 million equipment and inventory investment. Access roads and parking for facilities like that rely on consistent subgrade.
Truck terminals and cross-dock yards put the hardest demands on a road section. Tractor trailers turn, stop and start over and over on one stretch of pavement, and the subgrade under a terminal apron has to resist the shear of repeated maneuvers. Owners of a truck terminal or cross-dock often ask us for a stricter proof roll and denser testing grid than a standard street requires, and we plan the schedule to include that extra time.
Specifications and approvals for roadways
Roadway work follows the owner's specification. A city, county or state agency may require its own standard sections, test methods and inspection steps. Private roads follow the project documents, often borrowing from public standards. We obtain the applicable specification during planning and highlight differences from the geotechnical report.
Permits cover grading, right-of-way work, drainage and stormwater. Work in a public right-of-way requires traffic control plans and utility coordination. We prepare submittals for treatment materials and base, and we ask for inspector availability so that approvals do not delay the paving date. Those who build for utilities and energy companies will see similar submittal routines.
Send the alignment and the pavement section
Send the roadway plans, the pavement design and the soil report, and we will return a subgrade sequence with testing, treatment options and a release date for the base and paving crews.
Common Questions
Why is a proof roll part of the schedule?
We run a loaded truck or heavy roller over the finished subgrade with the engineer or technician observing. Soft areas rut or pump under the load, and those spots are repaired. Point tests can miss weak zones that a proof roll finds.
How is the subgrade strength verified?
Through density tests, proof rolling and sometimes bearing-ratio or similar strength tests set by the specification. The testing firm reports results and the engineer approves the subgrade before base placement.
Can a subgrade sit through rain before paving?
It can, but it must be rechecked. Wet weather can soften the surface, and traffic can rut it. We protect it with grading and drainage, and we repair damage before the base is placed.
How do you handle utility crossings under a new road?
Crossings are installed, backfilled in lifts and tested before the roadway subgrade is finished, so the trench is as dense as the surrounding ground. If a crossing must be cut later, the repair is compacted and retested to the same standard before base goes down.
When is treatment better than removal?
When the existing soil is workable but weak, and hauling and importing would be costly. Treatment is common for clay subgrades. The engineer decides based on test results and the pavement design.