Concrete containment is a poured, steel-reinforced wall and floor around tanks that holds a spill until it can be cleaned up. It’s permanent and strong. It’s also porous to some degree, and sooner or later it cracks. EPA said as much in a 1988 memo on concrete containment for hazardous waste tanks. That’s why concrete that holds oil needs a coating or liner and close inspection, and why most Permian lease sites, where batteries get reconfigured and the fluid is salty brine, are better served by lined steel-wall or modular containment. Concrete earns its place at fixed facilities that won’t move for decades.
What any secondary containment has to do
The federal SPCC rule doesn’t name a material. Under 40 CFR 112.7(c), “the entire containment system, including walls and floor, must be capable of containing oil” and must be built so a discharge “will not escape the containment system before cleanup occurs.” At tank batteries and separation and treating areas, 112.9(c)(2) asks for secondary containment sized to the largest single container plus freeboard for precipitation. Dike drains stay closed and sealed except when draining uncontaminated rainwater, per 112.9(b)(1).
EPA’s SPCC Guidance for Regional Inspectors (Chapter 4, 2013) explains the test. The rule sets no permeability or hydraulic conductivity number. “Sufficiently impervious” does not necessarily mean indefinitely impervious. Containment passes if it holds oil long enough for cleanup to happen before oil reaches navigable waters, and that call is made by the certifying PE and written into the plan.
Concrete can comply, and so can a lined steel wall or a lined earthen berm. They differ in how long each keeps passing that test without repair on your site.
Why concrete containment leaks
EPA’s Office of Solid Waste put it bluntly in a March 1988 memo on concrete liners for hazardous waste tank systems: “most concrete, of itself, is relatively permeable,” and “most concrete structures are subject to cracking sooner or later.” The memo’s answer was a coating or lining, such as epoxy, over the concrete. It added that the coating makes cleanup quicker and that cracks in the concrete or the coating must be repaired promptly.
The hazardous waste rules turned that into hard requirements for concrete vaults. Under 40 CFR 264.193(e)(2), a vault needs chemical-resistant water stops at every joint and an impermeable interior coating or lining compatible with the stored waste. For container storage, 264.175(b)(1) asks for a base “free of cracks or gaps.” The SPCC rule doesn’t copy those details for oil, but they show where regulators expect concrete to fail: at the joints, at the cracks, and through the slab.
The Bureau of Reclamation’s Guide to Concrete Repair (2015) lists the cracking types. Plastic shrinkage cracks form when fresh concrete loses water fast to wind, heat and low humidity, and they can run deeper than ordinary drying shrinkage cracks. Thermal cracks form when concrete expands and contracts without properly placed joints. Reinforcing steel influences where cracks form, but the guide says it won’t entirely prevent them.
Permian conditions that work against concrete
Three things on a West Texas location make concrete’s weak points worse.
Salt comes first. Produced water in most of the Permian is two to four times as salty as seawater, according to the Texas Living Waters Project’s 2025 report. Reclamation’s guide explains what chloride does to reinforced concrete. Portland cement’s alkalinity, about pH 12, keeps a passive layer on the rebar. Chlorides break that layer down and “greatly accelerate the rate of corrosion.” Rust takes up more room than the steel it came from, so it cracks the concrete further, which lets in more brine. A berm that sees repeated produced water drips is feeding that cycle.
Acid is the second. FracFocus lists acid among the most common frac fluid additives, used to dissolve minerals and start cracks in the rock. Acid attacks concrete directly. Reclamation’s guide says acid converts cement paste into calcium salts that slough off and leave the coarse aggregate exposed, and that strong acid damages concrete “very rapidly.” A spill of acid inside an uncoated concrete dike damages the dike while it’s containing the spill.
The third is the weather at the pour. The plastic shrinkage conditions in Reclamation’s guide (wind, heat, low humidity) describe a lot of summer days in the Permian. A slab poured on location without good curing practice can start its life with cracks.
You’ll also see the evidence from the outside. EPA’s inspector guidance says that at production facilities, oil stains, white areas and “white salt crystal deposits” on the outside of berm walls can mean oil and produced water have moved through the containment. The same guidance tells inspectors to look hard at untreated cinder block walls “due to their porous nature.”
Concrete vs lined containment on an oilfield site
| Poured concrete dike or curb | Lined steel-wall or high-wall system | Lined earthen berm | |
|---|---|---|---|
| Best fit | Fixed facilities that won’t change for decades: SWD plants, yards, truck unloading pads | Tank batteries, frac and flowback sets, sites that get expanded or moved | Large footprints on open ground |
| Holding oil | Depends on uncracked concrete or an intact coating | Depends on liner seams, edges and penetrations | Depends on the liner, or on high-clay compacted soil |
| Produced water and acid | Chlorides corrode rebar; acid attacks cement paste unless coated | HDPE holds up to hydrocarbons and produced water; check the liner’s chemical rating for acid | Same as the liner used |
| When it fails | Cracks, joints, coating wear. Repair means crack injection or recoating | Punctures and seam separation. Repair means patching the liner | Erosion, burrows, roots, liner damage |
| Changes later | Demolition | Walls and liner can be reconfigured or removed | Regrading |
| Truck access | Mountable curb sections, per EPA’s examples | Drive-over sections | Ramps that wear |
EPA’s guidance describes curbing as “a permanent reinforced concrete or an asphalt apron surrounded by a concrete curb,” sometimes with mountable curb sections so trucks and handling equipment can cross. That’s a sound design for a truck unloading pad at a disposal facility. It’s a poor match for a lease battery that will add tanks next year.
Where concrete still makes sense
Concrete is worth its cost when the footprint is settled and the owner will maintain it:
- Saltwater disposal plants and other permanent facilities with fixed tank farms.
- Yards and maintenance shops with permanent fuel or lube storage.
- Truck unloading and transfer pads where a curbed apron drains to a sump.
Even then, plan for the coating from day one. EPA’s 1988 memo treated a coating or liner as the normal way to make concrete hold fluid, and the hazardous waste vault rules require one. Specify it to resist what will actually sit on it: crude, brine and, if acid is handled on site, acid.
Inspecting concrete secondary containment
EPA’s inspector guidance lists what to look for at any dike or berm. For concrete, work through it like this:
- Cracks in the walls, the floor and especially the wall-to-floor joint. EPA’s guidance calls out permeability “through the wall (or wall-to-floor interface).”
- Joints and water stops. Missing or brittle joint sealant is an open path.
- Coating condition. Look for peeling, blistering and worn spots where people walk or hoses drag.
- Spalling and exposed aggregate, a sign of acid attack or of rebar corroding underneath.
- Rust staining bleeding through the surface over rebar.
- Salt crystals and stains outside the wall. EPA’s guidance treats these as a sign that fluid got through.
- Penetrations for pipes and conduit, and whether they’re sealed.
- Drain valves closed and sealed, with records of every rainwater release under 112.9(b)(1).
- Rain that never accumulates. EPA tells inspectors that a dike which never needs draining after heavy rain may be leaking through the walls or floor.
If you find cracks, Reclamation’s guide is clear that a bad crack repair is short-lived. Find the cause first, then repair with a method suited to it, such as epoxy injection for structural cracks. Some owners skip the patching cycle and line the concrete instead. A geomembrane over an old concrete dike gives the oil a continuous barrier, and the concrete goes back to being a wall.
The capacity check people forget
Concrete dikes are often built once and never re-measured. EPA’s guidance includes a worked example: a 60 ft by 36 ft concrete dike, 1.5 ft high, holds 3,240 cubic feet, or 24,235 gallons, before you subtract the volume displaced by every tank inside except the largest. Add a tank or a pump skid inside the walls and the dike may no longer hold the largest container plus rain. Our secondary containment calculator article walks through the displacement math.
Containment built for Permian locations
Site Safe Solutions builds containment systems for well pads, production sites and industrial yards: modular drive-over containment, primary containment pads laid out to the site, and high-wall systems for large volumes or steep ground. Crews specify HDPE and other liner materials and install them, and on the old site Site Safe described high-wall systems from 6 to 36 inches of wall height. If you’re deciding between pouring concrete and lining a battery that will keep changing, or you have an old dike you no longer trust, tell us about the site.
