Hawthorne Torrance Concrete pours lots for Torrance shops and industrial units, 6 inches on the aisle, 5 on the bays, doweled where a forklift crosses. Every estimate is measured and written on site.
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How a lot is built here
A parking lot fails at its joints before it fails anywhere else. A forklift carries its load on two small solid tires, so a pallet of steel puts more pressure on a square inch of concrete than a loaded semi does, and every time it rolls from one panel onto the next the loaded edge takes the whole of it. Panels that are only sawn apart rock under that, the edges step, and inside a few years the lift is climbing a lip at every joint on its route to the door.
Hawthorne Torrance Concrete was founded in 2017 by Kenji Okamoto, who put in 19 years on South Bay crews before that and who lays out the joint grid himself on every lot. Most of the lots we replace in Torrance were paved in the 1960s and 1970s as 2 or 3 inches of asphalt over farm soil, when the tenant was a shop with customer parking. The tenant now is a machine shop or an aerospace supplier with a forklift and a truck at the door, and the lot was built for neither.
Lots are built to the California Building Code under our CSLB C-8 license with the California Contractors State License Board, with liability insurance on every job. A commercial lot is permitted through the City's Community Development Department, which checks the accessible stalls and the drainage on the plans and inspects the base and the steel before the pour. The finished lot carries a written workmanship guarantee against defects in how it was built.
Repair or replace
Run a hand across a joint on the forklift's route and one side stands higher than the other. That is the panel edge pumping down under each pass with nothing across the joint to hold the two sides level. Grinding the lip flat buys a season, because the panel under it is still moving.
Where a truck brakes and a forklift turns, the asphalt has been pushed into waves and the roll-up door catches on the high point. Asphalt is flexible and a standing load creeps it, so an overlay does the same a year later. Only a rigid slab holds its shape under a wheel at rest.
A triangle of concrete missing from a panel corner means the corner had nothing under it, and a tire dropping onto it broke it out. The base has washed out through an open joint, and the next corner goes the same way once water is under it. Filling the hole leaves the void behind.
The plain is flat and the gutter is the only way out, so a lot that holds a puddle for days has lost its fall. The puddle sits over a low panel, and a low panel is one whose base has gone soft. A forklift then runs through water onto a sinking slab, and the joint goes next.
In every lot
Eight things are in every lot at no separate line, and each answers something a Torrance business does to its paving. A forklift crosses the joints all day, a truck backs to the door, and on a flat site the water leaves by the street or not at all.
The old surface is milled or broken out and hauled the same day, down to the soil, and anything the tenant buried in it comes out with it.
A loaded water truck is driven over the bare ground and every place it ruts is dug out and rebuilt, so no soft spot is left under a panel.
6 inches of crushed aggregate base compacted in two layers, tested with a plate, and graded to the same fall the slab will carry.
6 inches along the drive aisle and at the door, 5 inches under the parked cars, with the line between the two drawn on the estimate you sign.
Smooth steel dowels set in baskets across every joint the forklift or the truck crosses, so both panels carry the wheel and neither steps.
The grid is sawn the day of the pour, one joint under every stripe across the bays and at 12 feet along the aisle, so the cuts sit under the paint.
The grade is set to the gutter or the site drain before a form goes in, so a flat lot sheds a storm the way a sloping one does.
Stalls, the accessible bays and the aisle arrows painted after the cure, and the written guarantee handed over on the walk-through.
How it can be built
Four ways to build a lot for a business here, set against what runs on each part of it. The base is the same under all four, so the table is about depth, what crosses the joints, and how soon the tenant is back on it.
| Option | Carries | At the joints | Life | Back in use |
|---|---|---|---|---|
| 5-inch car lot | Cars and vans in the bays only | Sawn joints, fiber in the mix | 30 years or more | 7 days for cars |
| Mixed 5 and 6-inch lot | Cars on the bays, forklift on the aisle | Dowels on the aisle joints only | 30 to 40 years | 7 days for cars, 28 for the lift |
| 7-inch dock apron | Semis backing to a door all day | Dowels and a number 4 rebar mat | 40 years or more | 28 days before a trailer |
| Asphalt with truck pads | Cars on asphalt, trucks on the pads | Pads doweled, asphalt butted to them | 15 to 20 years for the asphalt | 2 days on the asphalt |
The 5-inch lot is the least concrete and the doweled aisle the most steel; the mixed lot spends the extra only on the strip the forklift uses, so most sites take it.
Wheels and water
A forklift on a lot that was paved for customer cars, and a plain so flat that a joint which steps half an inch is also a dam. Both are answered at the joint.
The industrial parcels along Lomita Boulevard, Western Avenue, Crenshaw and 190th Street were laid out for a shop and a row of cars, and the tenant today is a machine shop or an aerospace supplier with a forklift running pallets from the truck at the curb to the roll-up door. That route crosses the same six or eight joints two hundred times a week. A sawn joint has nothing across it, so one panel lifts as the wheel leaves, the next drops as it lands, and the base pumps out.
Water is the other half of it. Torrance sits on a plain that falls a few feet in a mile, so a lot sheds rain only along the fall the builder gave it, and the gutter or the site drain is the one way out. A joint that has stepped half an inch across that fall holds a puddle on its high side, the puddle soaks the base through the joint, and the low panel drops further, so a dowel is a drainage detail here too. Where a lot is cut into a neighbor's grade we pour the retaining wall with it.
From call to stripes
Five stages, the same crew throughout, and the person who walked the lot with your forklift driver is the one setting the dowel baskets before the pour. The City's permit is in hand before the asphalt is touched.
Kenji Okamoto walks the site with whoever drives the forklift, marks where the trucks stop and turn, shoots the fall, and writes the figure there.
You choose the build and the phasing, the plan goes to the City for review, and the dates are set once it is stamped rather than guessed before.
The asphalt goes out, the ground is proof-rolled under a loaded truck, and every rut is dug out and rebuilt before base goes down anywhere.
Base in two compacted lifts, dowel baskets pinned along the aisle joints, then the pour from 7 AM and the joint grid sawn the same afternoon.
Seven days wet, the stalls and the accessible bays painted on the joint lines, and the guarantee handed to you on the walk-through.
Behind the number
What runs on the lot moves the figure more than the size of it. Two lots of the same area can be a week apart in work once the routes are marked, which is why nothing is quoted from an aerial photo. Every estimate is measured and written on site.
A lot that carries cars alone is 5 inches throughout with sawn joints, and the estimate is mostly the asphalt coming out and the base going in.
The route from the curb to the door is 6 inches with dowels at every joint, so that strip is measured and estimated as its own area.
Where semis back to a door the apron is 7 inches on a rebar mat, and the plan check for a lot this size takes in the storm water as well.
Pouring in halves so the business trades throughout adds a mobilization and a construction joint, both written on their own lines.
The visit and the written figure cost nothing, and the call that books a time for it comes within 1 business day. (424) 484-9860 or send us a message.
Send the form or call, and someone rings back within 1 business day to fix a time. Kenji Okamoto walks the lot with you, marks the truck and forklift routes, shoots the fall and writes the figure at your premises, yours to keep.
Lots we replaced
Three reviews left on Google, Facebook and the BBB, each about a commercial lot rather than a driveway, and each naming what runs across it.
“Our lift crossed the same four joints a hundred times a day and every one had stepped. They took the asphalt and the broken panels out, put dowel baskets across the aisle and poured it at 6 inches. Eighteen months on the forks run to the door without a bump.”
“Twenty-two stalls behind the clinic and the lot held water for days after any rain. Kenji shot the fall to the street, rebuilt the base and poured 5 inches with a joint under every stripe. We closed half the lot at a time and never turned a patient away.”
“The dock apron had been shoved into ridges by the trailers and the door would not seal. They poured a 7-inch apron on a rebar mat, doweled it into the rest of the lot and had a truck backing to it on day 28 as promised. Flat and dry two winters later.”
Before you book
What a lot costs in closed days, what the estimate covers, what the City checks on the plans, and what is guaranteed once the stripes are on, answered for a business here.
What runs on it, more than how big it is. A lot that carries cars alone is one depth throughout, while a forklift route or a truck apron is deeper, doweled and steeled, so those strips are measured and estimated as their own areas. The old asphalt and what the proof-roll finds under it set the rest, and pouring in halves so the business stays open adds a mobilization. All of it is measured and written on site.
Five to eight working days on the ground for a lot of twenty to forty stalls, then seven days of cure before a car parks on it and 28 before a forklift or a truck does. Milling and proof-rolling take the first two days, base and dowel baskets the next two, and the pour is one morning with the joints sawn that afternoon. Most Torrance lots are poured in halves so half the stalls stay open through all of it.
Yes. Milling or breaking out the asphalt, loading it and hauling it to a recycler is written into the figure, and so is the dig-out and rebuild of every soft spot the proof-roll turns up. What sits outside it is named at the visit rather than added later, the City's plan check fee, a site drain added to carry the fall, or an old tank under a former service station. The number you sign is the one on the bill.
Yes, whenever the lot is rebuilt rather than patched. The plan goes to the City's Community Development Department, which checks the accessible stalls and the route from them to the door against the California Building Code, and the drainage against the storm water rules a lot this size falls under. The approach at the street is an encroachment permit from Public Works. We file both and meet the inspector.
Almost never. A commercial property policy treats stepped joints, rutted asphalt and ponding as wear, so a lot that has failed under twenty years of forklifts is the owner's to replace. The exception is sudden damage, a truck that drops a container through the slab or a water main that washes the base out, which is a claim with a date on it. Photograph the lot before anything is milled, and ask your carrier first.
How it was built. The base depth, the slab depths on the plan, the dowels at the aisle joints, the joint spacing and the fall to the drain, with those terms printed on the estimate before you sign. It is a written workmanship guarantee against defects in how it was built. Tire marks, oil, wear and a load the plan never allowed for sit outside it. Where the fault is in the build we come back and put it right.
A 4,000 psi ready-mix on the aisles and the apron and 3,500 on the car bays, over 6 inches of crushed aggregate base. The aisle joints take 3/4-inch smooth steel dowels 18 inches long in baskets at 12 inches, and a truck apron takes number 4 rebar on an 18-inch grid as well. A 5-inch car bay carries fiber in the mix. The mix and the steel are named on the estimate, so the delivery ticket can be checked against it.
Not the whole of it, and usually not at all. A lot is poured in halves or in thirds so the stalls on one side stay open while the other is out, and the forklift route is done last and fastest so the door is shut for the fewest days. What the crew needs is the cars off the section being worked, a place to stand the pump, and someone to open the gate each morning. Deliveries move to the open half for the week.
Towns we pour in
The eight nearest towns on the list, with the straight-line distance from the office on Hawthorne Boulevard beside each. Every lot is measured at the premises before a figure is written.
Four jobs that tend to be booked with a new lot or straight after it, on the same base, by the same crew, and itemized on the one written estimate.
The footings under a canopy, a sign or a fence post along the new lot, dug and poured with it.
A poured wall where the lot is cut below the neighbor's grade or holds a bank at the back.
The public walk and the accessible route from the stalls to the door, poured to the same fall.
Sawing out a failed panel or a trench for a new drain without breaking the lot around it.
Call or send the form and you hear back within 1 business day. Say roughly how many stalls the lot has and whether a forklift or a truck runs on it, and the visit can be booked for a day inside the same week.