Mass grading on the Front Range is a moisture and compaction problem before it is an earthwork problem. The soil that goes under a warehouse floor has to be placed at the right moisture and density, and in Colorado that requirement is shaped by clay that can swell when it takes on water. The Colorado Geological Survey states that most homes, schools and roads in Colorado are in areas of potentially expansive clay. For an industrial owner, that means grading is the first structural operation on the job, not a site chore.
Our clearing and grading scope begins with the survey and the geotechnical report. We strip and stockpile topsoil, remove vegetation and any existing structures or buried debris, and cut and fill to the finished pad elevation. We balance cut and fill where the parcel allows it, because hauling soil off and importing it back is the most expensive way to grade. The earthwork plan states quantities, haul distances, equipment and the schedule.
After rough grade we shape the site for drainage: building pad elevated above the surrounding grade, truck court slopes that drain away from docks, swales to the detention area and a defined overflow path. The stormwater detention and drainage trade crew builds the outlet structures and basins in the same mobilization so the site drains from the first rain.
Moisture, lifts and verification
Fill is placed in controlled lifts and compacted to the density the geotechnical engineer specifies, at a moisture range that keeps clay from drying and cracking or becoming too wet to compact. We keep water trucks on site, cover stockpiles in wet periods and scarify and recondition when a lift has dried. A testing agency samples each lift and reports density results, which we keep as part of the turnover record.
Where the report calls for overexcavation of expansive clay under the building, we remove it to the specified depth and replace it with engineered fill, extending the limits beyond the building footprint so the edges do not heave. The Colorado Geological Survey notes that volume increases of 3 percent or more are considered potentially damaging and generally require specially designed foundations, so this step is a design requirement and not a precaution.
What the earthwork includes
The scope covers clearing and grubbing, demolition of existing site features, topsoil handling, cut and fill, benching, subgrade preparation for building and pavements, utility trenching, stabilized laydown yards for construction, and temporary erosion and sediment controls. We install perimeter silt fence or wattles, a stabilized construction entrance, inlet protection and concrete washout areas before disturbing soil.
Haul roads and construction access matter on larger sites. We build a heavy-haul access road early on big projects so that scrapers, trucks and later steel deliveries do not rut the pad. Plants in metals and heavy industry often need that road to carry oversized loads for years after construction, so we design it for the permanent load and not the construction one. On redevelopment parcels, our demolition and slab replacement scope includes removing old foundations and pavements and sorting materials for recycling when the project allows it.
Environmental history and soil handling
Some of the most useful industrial land along the metro has a history. The Rocky Mountain Arsenal near Commerce City was cleaned up for $2.1 billion, and the Army will permanently manage about 1,000 acres of the former arsenal containing landfills, waste consolidation areas and groundwater treatment facilities. Neighborhood activism in Globeville and Elyria-Swansea won a 1994 settlement with ASARCO that funded soil cleanup. Both are reminders to check environmental records before moving dirt near older industrial areas.
We review Phase I reports where they exist and stop work if an unexpected condition is found: stained soil, buried drums, odors or unusual debris. We then notify the owner, secure the area and wait for the environmental consultant. A sampling plan and a soil management plan are written for sites with known issues, so that contaminated soil is segregated, tracked and disposed of correctly instead of becoming fill.
Water, groundwater and seasons
Parcels near the South Platte River, including the areas around Greeley and Evans, can have shallow groundwater and floodplain constraints. The South Platte bounds the Greeley and Evans area on the south and the Cache la Poudre River runs through north Greeley. We dewater trenches and excavations where needed, hold groundwater readings from the geotechnical borings in the earthwork plan, and match our pad elevations to the flood requirements in the permit.
Season controls production. Denver averages about 49 to 54 inches of snow a year, and frozen soil cannot be compacted to specification. We schedule fill placement in the warmer months wherever possible and use blankets or lime or cement treatment only when the engineer approves. Dust control, wind and runoff all have to be managed during the dry months as well.
Sequencing against the building
The grading schedule is set backward from the date the foundation crew needs to start. Rough grade, utilities, subgrade and building pad must be accepted by the geotechnical engineer before the first footing. We schedule testing visits in advance so that a pad is not waiting for an inspector. Large parcels are graded in sections, so that the pad area is complete first and the truck court and parking areas follow while the foundation work begins.
For distribution centers and similar large-footprint buildings in Commerce City and the surrounding corridor, a missed grading milestone can move the whole steel or tilt-wall erection date. We therefore track earthwork as a critical path item, with weekly volume targets and a plan for weather days.
Get the earthwork right first
Send us the survey and geotechnical report. We will return a grading plan with quantities, equipment, schedule and the conditions that could change the price.
Common Questions
How do you handle expansive clay in grading?
We follow the geotechnical report, which may require overexcavation, moisture conditioning and engineered fill under the building and pavements. We keep the moisture within the specified range during placement and protect finished pad surfaces from drying or wetting before the slab is placed.
Do you balance cut and fill?
Yes, wherever the parcel allows. Balancing reduces trucking and import costs. We prepare an earthwork model with quantities and swell or shrink factors, then adjust it as we strip topsoil and find actual conditions.
What permits are needed before we can grade?
Usually a grading or site development permit and an erosion and sediment control plan, plus federal and state construction stormwater permit coverage for disturbed area above the threshold. We confirm the details with the jurisdiction and the engineer of record.
Can you work on a site with a known environmental condition?
Yes, with a plan. We follow the environmental consultant's soil management plan, segregate and track material, and coordinate disposal. We will not mix material of unknown quality into compacted fill.
How long does mass grading take?
It depends on the quantities, the soil and the season. A pad of a few acres with balanced earthwork can often be rough graded in weeks, while a large park takes months. We give a schedule after reviewing the grading plan and the geotechnical report.