Portland Wash Bay Concrete Built for Fleet Operations
Wheel loaders, dump trucks, and excavators need a place to get clean without contaminating storm drains. We pour wash bays with the structural capacity for heavy equipment traffic, engineered slope that moves water to trench drains, and integration with oil-water separators that meet environmental discharge rules. Every bay starts with a site assessment and a free written estimate.
When a loader or dump truck gets washed, the runoff carries oil, sediment, and detergent. That water cannot flow directly into storm drains. Local regulations require the wash water to pass through an oil-water separator first, which means the concrete slab itself has to be designed to move water efficiently toward the separator without pooling or bypassing the system.
We size the slab for the heaviest equipment that will use it, establish slope in every direction toward trench drains, connect those drains to the separator, and apply chemical-resistant finishes if your wash process includes degreasers or alkaline cleaners. The result is a bay that handles daily traffic and meets environmental compliance.
We measure the bay footprint, identify the heaviest equipment that will use it, determine where the separator will sit, and design the slab thickness and slope geometry to move water toward drains without pooling.
Excavate and prepare subgrade
The bay area is excavated to the correct depth, subgrade is compacted to specification, gravel base is placed, and trench drain lines are routed before any concrete forms are set.
Form and pour with slope
Forms are positioned with the engineered slope built in, reinforcement is placed for equipment loads, and the concrete is poured and finished with a broom texture for foot grip during wash operations.
Verify drainage and connect separator
After the slab cures, trench drain grates are installed, the separator is connected to the discharge line, and the entire system is tested with water to confirm proper flow before handoff.
The critical detail
Proper Slope Cannot Be Added After Cure
A wash bay without correct slope becomes a puddle that sits until it evaporates. Water must flow from every corner and edge toward the trench drains, and that slope has to be consistent so no low spots trap water. We verify slope during the pour using a level and water flow tests, and again after cure. If slope is wrong, the slab has to be torn out because slope cannot be corrected on cured concrete.
Coordinate with your manufacturing or industrial operations team on equipment specifications and with environmental staff on separator sizing and discharge routing. The wash bay is one component of your site's larger environmental and operational infrastructure, and we integrate it accordingly.
Trench drains, oil-water separators, slope verification and storm-water compliance.
Storm-water regulations require hydrocarbons to be removed before wash water enters the storm system. Oil-water separators are the engineered solution; without them, the wash bay's discharge violates discharge limits and can trigger fines or shutdowns.
During the pour with a level and a water flow test, then again after cure. Every direction across the bay must carry water to a trench drain; pooling anywhere means the slope is wrong and needs correction before the slab cures.
Sometimes, if it can be sloped (often it cannot), drained (usually needs new trenches cut), and routed to a separator (almost always new work). The economics often favor a purpose-built bay; we will assess case-by-case.
Yes if degreasers or harsh detergents are part of the wash cycle. Standard concrete surface degrades under repeated alkaline or solvent exposure; chemical-resistant treatment extends slab life dramatically.
Several weeks from excavation through cure and separator install. The full schedule is in the quote, including time for the environmental discharge connection if regulatory review is required.
Client reviews
What Portland Operations Say About Their Wash Bays
New wash bay with proper slope to trench drains and the oil-water separator we needed for compliance. Discharge passes regulatory inspection, equipment gets washed faster, no more puddles in corners.
Z. K5
Fleet Manager, Portland
★★★★★
They engineered for our wheel loaders and dump trucks, the heaviest stuff we run. Slab has held under daily traffic, drainage works through every wash. Right tool for the actual fleet.
Y. K5
Operations Director, Vancouver
★★★★★
Wash bay with chemical-resistant surface for the degreaser we use. Three years of operation, no surface degradation, separator processes hydrocarbon properly. Compliance side covered.
Q. K5
Mining Operations, Hillsboro
★★★★★
They tested the slope with water before signing off. Pooled in one corner; they corrected it before cure. Final result drains perfectly. Real install discipline.
X. K5
Construction Yard Manager, Gresham
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Describe your equipment fleet, wash chemistry, and site layout. We will engineer the slab and separator system, then send a written quote with schedule.
