Concrete Washouts

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Concrete Washouts
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Concrete Washout Checklist

• Designate a washout area.
• Straw bales lined with heavy plastic.
• Locate away from street with 3-4 rock entrance.
• Rent portable washouts.
• Dispose of washout contents at ¾ full.
• Cover during rain event.
• Pay the environmental fee from the concrete
  supplier and have washout water returned to the
  supplier for disposal.

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A poor excuse for a concrete washout!

• Location is too close to curb
• No containment (i.e. straw bales lined with
  plastic)
• Could trigger sampling by water quality inspector

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Problematic Concrete Washout
Both of these concrete washouts are subject to
failure and potential discharge and inspection
sampling.
The one on the left, framed with 2x12, is ready
to burst.
They are too close to the road and gutter which
leads to the storm drain inlet.
The washout below was subject to overflow from
the beginning.
Neither are being maintained.
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Proper Concrete Washouts
The criteria for a good concrete washout is that
they are constructed and lined with materials
capable of holding the anticipated amount of
volume.
Timely maintenance is very important. Washouts
should be emptied before they reach full capacity.
They should be located away from curbs and any
culvert, drainage ditch or other sensitive area.
It is also a good idea to lay a rock entrance to
them to minimize mud tracking on to roads.
They should be covered during a rain event.
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Here is an example of a well constructed concrete
washout site.
The washout is located away from the road and
constructed of hay bales lined with plastic.
The entrance to the washout is on a bed of 3
aggregate.
One more thing Equipment and vehicle cleaning
can not take place where the runoff could enter a
storm drain, culvert, drainage ditch, or any
other waterway.
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Portable Concrete Washouts are good for limited
site space.
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Concrete washout areas should be shown on your
site plan.
Concrete Washouts must be lined with thick
plastic liner to protect against leaks and
seepage to ground water. It must be located away
from storm drains and drainage ditches. Washouts
should have temporary stabilized rock entrances
to minimize tracking of sediment.
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Concrete Washouts

• Refer to the FishNet Roads Manual BMP Toolbox
• Sediment Management BMPs
• Concrete Washout