m
m
Line 34: Line 34:
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>[http://stormwater.pca.state.mn.us/index.php/Summary_of_horizontal_and_vertical_setback_distances Separation distances] cannot be achieved</td>
+
<td>[http://stormwater.pca.state.mn.us/index.php/Summary_of_horizontal_and_vertical_setback_distances Separation distance] from a BMP cannot be achieved</td>
 
<td>2</td>
 
<td>2</td>
 
<td></td>
 
<td></td>

Revision as of 20:19, 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
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