1. Prevents contamination of the aquifer by trapping all kinds of hydrocarbons (oil, grease, gasoline, etc.)

2. Traps debris, silt, heavy metals and solids from going into the drainage system, extending the system's life.

3. Spills containment capacity minimizing expensive cleanups.

4. Easy installation in new or old inlets.

5. Inexpensive, simple maintenance and monitoring.

6. Available for different inlet types or structure sizes.
EPA: United States Environmental Protection Agency Links

Stormwater discharges are generated by runoff from land and impervious areas such as paved streets, parking lots, and building rooftops during rainfall and snow events that often contain pollutants in quantities that could adversely affect water quality. Most stormwater discharges are considered point sources and require coverage by an NPDES permit. The primary method to control stormwater discharges is through the use of best management practices.

BMP Description
In-line quality devices are storm sewer insert type devices which are used to catch sediments, filter, and absorb hydrocarbon products from the storm water runoff in the catch basin manhole structure before entering the storm sewer system.

Why is this BMP being tested?
This Rouge pilot BMP was selected for demonstration in order to evaluate a low cost storm inlet insert type devices in the Rouge Watershed. This demonstration will provide information on the benefits and costs of these devices, including operations and maintenance requirements. The information from these devices will be used to determine if existing design criteria should be modified and if existing storm sewer inlet manholes should be retrofitted with these devices to provide pollutant removals, and the estimated costs of these actions. Water quantity and water quality benefits of a watershed-wide application of this type of BMP will be estimated and included in the final report.

These devices are not used in the Rouge River Watershed. Unique designs of these devices were used in the States of Florida and Washington. Applicability of these devices in gas stations, small convenience stores and small parking lots in the watershed are possible due to their low cost.


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