The last two inches of a building pad decide more about a slab than the first two feet do. Fine grading is the pass that trims a compacted pad or base to the elevations on the plans, inside the tolerance the engineer allows, so the concrete placed on top lands at the intended thickness everywhere instead of thick in the low spots and thin on the high ones. On a floor that carries pallet racking, a hangar apron that must shed water toward a trench drain, or a parking field with a published slope limit, that tolerance is a contract term and not a courtesy.
We schedule fine grading as its own step in the pour calendar, between the bulk earthwork and the first form or reinforcing delivery. Mass grading and compaction are finished and tested by the earthwork partners we coordinate. We then coordinate laser or GPS-guided blade work, string-line checks and hand shaping at the edges, and we record the result with elevation shots before anyone orders concrete. In Midland that sequence has to allow for caliche that cuts clean when dry and smears when wet, and for a ready-mix haul that is short on a quiet Tuesday and long on a Friday when every contractor in town wants a truck. The owner's rep receives the elevation record in writing, and the batch plant gets a firm placement date only after the grade has been accepted.
Tolerances, submittals and the permit office
Fine-grading tolerances come from the project documents, usually the civil sheets for paving and the structural general notes for slabs. A typical callout holds a building pad to a narrow band around design subgrade and gives paving subgrade a different band, and we read both before the first pass because the two are rarely the same. If the geotechnical report asks for a moisture-conditioned, proof-rolled surface immediately before concrete, we write that into the sequence so that a stray storm cannot undo the work between acceptance and placement.
Permitting sits mostly on the earthwork and stormwater side of the file. The local permit office reviews grading and drainage plans for commercial sites, and on a larger disturbed area the stormwater plan has to be in place before anyone moves dirt. We ask for inspections ahead of the fine-grade pass instead of after it, because the testing technician and the inspector both want to see the surface in the condition the drawings describe, not after a dozen trucks have driven across it. The adopted building code and the engineer of record settle the remaining questions, and we do not substitute our own judgment for either.
Owners who write the grade into the contract
Developers of spec offices and retail pads along Loop 250 care about two outcomes from a fine-grade team: finish elevations that let the pad drain to the inlets as drawn, and a surface ready on the day the concrete subcontractor arrives. Our planning for commercial developers is organized around that handoff, with the elevation record and the testing sign-off delivered together so the next trade does not wait on paperwork.
Energy and midstream owners ask for a different emphasis. Their slabs carry compressors and skid-mounted equipment, containment curbs depend on a uniform base underneath, and the graveled yard around a plant has to shed water to a sump or a ditch without ponding against the equipment. On oil, gas and midstream projects we agree on the drainage direction first and the tolerance second, because a yard that holds water becomes a maintenance bill the day the plant starts up.
Crews mobilized across the Basin
We mobilize trade partners and site supervision to Midland and the communities around it, including Odessa, Big Spring, Lamesa, Stanton and Coahoma. Seminole shows how geography shapes the plan. Several highways and a farm road converge there, and traffic from every direction reaches the same few intersections, so deliveries and the haul to a project edge have to be timed with local truck patterns in mind. For a site on the western plains we would rather bring a laser-guided grader and a water truck together than send them on separate days, and we say so when we price the mobilization. You can read more about building in Seminole on its own page.
Heat, wind and open ground
Weather defines the fine-grade window in Midland more than any other single factor. The National Weather Service logged 33 days at or above 100 degrees in 2022, and the record year, 2011, reached 65. A finished pad exposed to that heat dries and crusts within hours. We schedule grading passes at the cool end of the day, keep a water truck beside the blade for moisture conditioning, and pair the last pass with the pour so the surface the engineer accepted is the surface the concrete meets.
What each building type needs from the grade
Hangar aprons are the most demanding surfaces we trim in this market. Aircraft loads are heavy and concentrated, and the apron must slope toward drains at a gradient that sheds fuel and water without making the tow bar's job harder. The airport at Midland carries four asphalt runways, the longest of them 9,501 feet by 150 feet, and the buildings around it follow a similar logic of long, flat, carefully sloped surfaces. Our aircraft hangar pages go into the paving and slab side of that work.
A written sequence before the blade starts
Before we trim anything we put together a one-page sequence: who accepts the compaction results, what elevation tolerance applies, how many shots per grid we take, which technician performs the proof roll and who calls the batch plant. That page goes to the owner's rep, the general contractor and the testing firm. It reads like a small thing, but it prevents the most common failure on a pad, which is two parties each assuming the other will confirm the surface.
Work that comes before and after
Fine grading is the middle of a chain. It depends on clean building pad preparation behind it, where subgrade is treated, compacted and tested, and it leads straight into the paving base for drive lanes and lots. Where asphalt or concrete paving will follow, the same partner often carries on into asphalt paving base preparation, which keeps one set of control points and one set of elevations running from the building to the property line.
When a project also needs forms, reinforcing and placement, we coordinate those handoffs on the same calendar, so the person responsible for each step is named before mobilization. That is the reason we like to see the full set of drawings, even for a job that appears to be only grading: a trim to the wrong tolerance is cheap to fix before the forms go in and expensive afterward.
Send us the grading sheets and the pour date
Share the civil sheets, the geotechnical report and the target placement date, and we will return a written fine-grade sequence with testing hold points and a mobilization window for your site.
Common Questions
How tight can fine grading realistically be on a building pad?
The answer comes from the plans, not from our preference. Many structural notes allow a narrow plus-or-minus band on the pad, and paving subgrade is often given a looser band. We trim to the tighter number the documents state and confirm it with rod or rover shots, because a pad that is only close can still cost extra concrete or leave thin spots.
When should the final trim happen relative to the pour?
As close to placement as the weather and the schedule allow. In this climate a trimmed surface can dry out or lose fines to wind within a day, so we aim to finish the pass, get acceptance and release the pour in the same short window. If the pour slips, we re-check the grade before the forms or reinforcing go in.
Who signs off on the finished grade?
That depends on the contract, but usually the testing firm confirms compaction and the surveyor or our site supervision records elevations, then the engineer or owner's rep accepts both. We ask for that chain in writing during mobilization so the batch plant is not scheduled against a sign-off nobody has agreed to give.
Does caliche change the fine-grading approach?
Yes. Caliche cuts cleanly and holds a crisp edge when dry, but it turns slick and soft when wet and can rut under the first truck. We keep traffic off a finished caliche pad, add moisture only in controlled amounts and re-proof the surface if rain falls before the pour.