Construction BMP Guide: C106 Wheel Wash
A wheel wash reduce the amount of sediment transported onto paved roads by washing dirt from the wheels of motor vehicles prior to the motor vehicles leaving the construction site. A wheel wash can consist of a paved shallow depression filled with water, or can be a specialized system that actively pressure washes wheels and tires on a large surface pad with direct drainage to a large sump. This BMP is often utilized when a construction entrance alone is not effective at removing sediment from vehicles and equipment. The most effective wheel washes are used in conjunction with a stabilized construction entrance.
Wheel Wash Installation:
- Avoid installing in areas where water dripping from the trucks can run unimpeded into the street
- Test clearances and effectiveness using a low clearing truck before paving
- Keep water between 12-14 inches deep to avoid damage to truck hubs and filling truck tongues with water
- Active pressure washing systems should have a sump of at least 10’x10′
- A minimum of 6 inches of asphalt treated base over crushed base material or 8 inches over a good subgrade is recommended to pave the wheel wash
Wheel Wash Maintenance:
- The wheel wash should start out each day with fresh water
- The washwater for the wheel wash should be changed a minimum of once per day. On large earthwork jobs where more than 10 to 20 trucks per hour are expected, the wheel washwater will need to be changed more often.