Oil Grit Separators
An oil/grit separator is a structure that is installed underground
and typically catches runoff from parking
lots. Separators normally have three chambers that
water passes through. In the first chamber, the grit is
deposited on the bottom while the clean water moves
to the second chamber. Here oil and grease float on
top of the water while the clean water moves into the
third chamber through a hole in the bottom of the chamber
wall. The third chamber allows for additional settlement
of fine particles before discharging the water either
to the storm sewer system or to a retention or
detention basin.
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From an average construction site, 30 tons of sediment per acre is eroded into nearby waterways.
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