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==Overview==
 
==Overview==
Oil and Grit Separators (OGS) are Manufactured Treatment Devices (MTDs) used for water quality treatment of stormwater runoff through the removal of large particle suspended solids and associated pollutants, and debris. Some devices can also trap light liquids such as oil and other floatables. These MTDs are typically installed underground within the stormwater sewer system in an on-line or off-line configuration. They are distinguished from [[Pretreatment|Filtration-based MTDs]] by their removal of solids through settling rather than filtration.
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Oil and Grit Separators (OGS) are Manufactured Treatment Devices (MTDs) used for water quality treatment of stormwater runoff through the removal of large particle suspended solids and associated pollutants, and debris. Some devices can also trap light liquids such as oil and other floatables. These MTDs are typically installed underground within the stormwater sewer system in an on-line or off-line configuration. They are distinguished from [[Filtration Manufactured Treatment Devices]] by their removal of solids through settling rather than filtration.
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==Application==
 
==Application==
 
Oil and Grit Separators are suitable as pre-treatment to other downstream treatment systems such as ponds or LID features.  Cost effective application of OGS as [[pretreatment]] to a downstream LID practice typically requires that the practice have a single [[inlet]] with a drainage area larger than 0.2 ha.   
 
Oil and Grit Separators are suitable as pre-treatment to other downstream treatment systems such as ponds or LID features.  Cost effective application of OGS as [[pretreatment]] to a downstream LID practice typically requires that the practice have a single [[inlet]] with a drainage area larger than 0.2 ha.   

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