Difference between revisions of "Decision process for selecting liners"
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<td>See section on [http://stormwater.pca.state.mn.us/index.php/Karst karst] for more information</td> | <td>See section on [http://stormwater.pca.state.mn.us/index.php/Karst karst] for more information</td> | ||
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| + | <td>Prevent groundwater intrusion into a BMP requiring aerobic conditions, such as iron-enhanced media</td> | ||
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Revision as of 20:21, 2 December 2015
Design process for selecting the appropriate liner level.
Link to this table
| Condition | Design level | Note |
|---|---|---|
| Filtration BMP with less than 3 feet of separation to seasonal saturated soil or bedrock | 1 | Required under the Construction Stormwater permit |
| BMP in confirmed potential stormwater hotspot with high or very high groundwater pollution potential | 1 | Applies to all post-construction BMPs. See section on Potential stormwater hotspots for more information |
| Constructed ponds or constructed wetlands with less than 3 feet separation from seasonally high water table in a potential hotspot | 1 | |
| Karst terrain with high or very high groundwater pollution potential | 1 | See section on karst for more information |
| Prevent groundwater intrusion into a BMP requiring aerobic conditions, such as iron-enhanced media | 1 | |
| Maintain permanent pool in constructed ponds or constructed wetlands in areas underlain by geologic material that is fractured or has a high infiltration rate | 2 | |
| Separation distance from a BMP cannot be achieved | 2 | |
| Separate tree BMP from road, parking lot, sidewalk or adjacent walls or building foundation | 2 | To prevent tree root intrusion. See link |