Dirt Work & Fine Grading in San Diego, CA

Dirt work and fine grading come before almost every good hydroseed job in San Diego. Seed will sprout on nearly anything for a week or two. Whether it survives depends on what is underneath: whether water drains away from the house or pools against it, whether roots can get into the soil or hit compacted fill at two inches, and whether the surface is smooth enough to mow. Our grading crews handle yard grading, land grading on larger lots, topsoil, soil prep and the drainage trenching that ties it all together, so the seeding crew starts on ground that is ready.

Yard grading that moves water away

The first rule of yard grading is that the ground should fall away from the foundation and toward a place water can go: the street, a swale, a drain inlet or a stable outlet at the edge of a canyon. On San Diego's mesa lots, the natural tendency is for water to run toward the rim, which is often the worst possible place for it. We set grades with a laser or string lines, cut high spots, fill low ones, and shape gentle swales where needed. On flat lots, even a small fall makes a big difference after a February storm.

Clay, compaction and ripping

Much of coastal San Diego sits on old marine terraces and alluvial fans with clay subsoils. The USDA describes the Huerhuero series, for example, as a brown loam surface over clay with very slow saturated hydraulic conductivity. Add a builder's compacted fill pad on top and you get ground that sheds water like pavement and that roots cannot penetrate. Before seeding, we rip or till compacted areas to open them up, remove the rock, concrete and trash that turns up, and work in topsoil or organic material where the surface is poor. On clay we also avoid working soil when it is wet, since that smears and seals it.

Granite soils and slopes

Inland, in places like Escondido, Poway, Ramona and the hills of East County, decomposed granite is common. The Vista series, for instance, is a coarse sandy loam formed from decomposed granite on hills and uplands. It drains well and is easy to dig, but once the surface is disturbed it washes readily. Grading on these soils needs gentle transitions, compacted fill where the plan calls for it, and quick cover afterward. We often grade and hydroseed within days of each other on these sites to cut down the time bare soil is exposed.

Excavation and trenching for drainage

The same crews that grade the yard dig the trenches and do the excavation a drainage fix depends on: French drains along a wet side yard, buried downspout lines carrying roof water to the street, area drains in low spots, and trenches for swale outlets and rock energy dissipators at the top of a slope. This is where a lot of erosion problems are really solved. A canyon slope will not stay covered if four downspouts dump onto it, and a lawn will not grow in a low spot that stays saturated for a week after every storm.

Topsoil

Topsoil makes sense where native soil is thin, sterile or mostly fill. HomeAdvisor and Bob Vila put bulk topsoil at roughly $12 to $55 per cubic yard, and Angi lists delivery at $50 to $150 per trip for up to 15 cubic yards, with spreading labor around $60 to $125 an hour. We do not automatically sell imported soil, though. On many lots the better move is ripping and amending what is already there, and we will tell you which applies.

Before we dig

Any trenching or deep cut starts with underground utilities marked, so we request locates before the work. We also look for irrigation lines, low-voltage lighting and old drain pipe that may not show on any map, and we flag trees whose roots would be cut by a trench. On canyon-edge lots we keep heavy equipment back from the rim and check whether any grading or drainage work near the slope needs a permit before we start. Spoil from trenches is either reused on site to fix low spots or hauled off, and that choice is spelled out in the estimate.

Land grading for larger lots

On acreage, horse properties and small development sites, land grading covers bigger areas and bigger machines: reshaping pads, cutting and filling for driveways and outbuildings, and building berms and swales to direct water around improvements. If the work disturbs an acre or more, the state's construction stormwater permit likely applies, and you will want silt fence and a stabilization plan in place before the first storm. We can provide all three: the grading, the sediment controls and the seeding.

Cost

HomeAdvisor puts lawn leveling at about $1 to $2 per square foot and lists an average around $2,176 for a resloping project. Lawn Love gives fine grading at 8 cents to $1.00 a square foot and residential resloping at $770 to $3,000. Access, soil, rock, haul-off and how much material moves are what set the real number, which is why we price after a visit.

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