m
m
Line 51: Line 51:
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>BMP is located in D soils, unless infiltration allowed by LGU with a current MS4 permit</td>
+
<td>BMP is located in D soils</td>
 
<td>if CGP applies</td>
 
<td>if CGP applies</td>
 
<td></td>
 
<td></td>
Line 57: Line 57:
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>BMP is 1,000 feet up-gradient or 100 feet down-gradient of active karst, unless infiltration allowed by LGU with a current MS4 permit</td>
+
<td>BMP is 1,000 feet up-gradient or 100 feet down-gradient of active karst</td>
 
<td>if CGP applies</td>
 
<td>if CGP applies</td>
 
<td>X</td>
 
<td>X</td>
Line 63: Line 63:
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>BMP is located within a DWSMA, unless infiltration allowed by LGU with a current MS4 permit</td>
+
<td>BMP is located within an Emergency Response Area in a DWSMA exhibiting high or very high vulnerability</td>
 
<td>if CGP applies</td>
 
<td>if CGP applies</td>
 +
<td></td>
 +
<td></td>
 +
</tr>
 +
<tr>
 +
<td>BMP is located within an Emergency Response Area (ERA) in a DWSMA exhibiting moderate vulnerability, or outside an ERA in a DWSMA exhibiting high or very high vulnerability</td>
 +
<td>if CGP applies, unless a higher engineering review indicates infiltration is acceptable</td>
 
<td></td>
 
<td></td>
 
<td></td>
 
<td></td>

Revision as of 14:01, 17 August 2018

Summary of situations where infiltration of stormwater runoff is prohibited or not recommended.
Link to this table

Condition Prohibited Not recommended Not recommended unless conditions are met1
Local rule or ordinance prohibits infiltration X
BMP is < 100 feet from drinking well in sensitive aquifer3 X
BMP is < 50 feet from drinking well in a non-sensitive aquifer3 X
BMP receives discharges from vehicle fueling and maintenance areas if CGP applies2 X
There is less than 3 of separation to bedrock or saturated soil if CGP applies X
BMP receives discharges from certain industrial facilities4 if CGP applies
BMP is areas where high levels of contaminants in soil or groundwater will be mobilized by the infiltrating stormwater if CGP applies X
BMP is located in D soils if CGP applies X
BMP is 1,000 feet up-gradient or 100 feet down-gradient of active karst if CGP applies X
BMP is located within an Emergency Response Area in a DWSMA exhibiting high or very high vulnerability if CGP applies
BMP is located within an Emergency Response Area (ERA) in a DWSMA exhibiting moderate vulnerability, or outside an ERA in a DWSMA exhibiting high or very high vulnerability if CGP applies, unless a higher engineering review indicates infiltration is acceptable
BMP is located in soils with infiltration rate > 8.3 in/hr unless amended or infiltration allowed by LGU with a current MS4 permit if CGP applies X
BMP is located within 1 year travel time of drinking supply well X
BMP located within 10 feet of building or structure X
BMP located within 35 feet of a septic system X
BMP located less than 200 feet from toe of slope that exceeds 20% X
BMP receives discharges from a confirmed stormwater hotspot X
A groundwater mound formed beneath the BMP during infiltration extends into the BMP X

1see discussion below for conditions under which infiltration is acceptable.
2CGP = Construction Stormwater General Permit
3See Minnesota Rules Chapter 4725
4To determine if infiltration is allowed for a specific industrial sector or subsector, go to the list of sectors, select the sector of interest, and review section 8 for that sector (Use of Infiltration Devices and/or Industrial Stormwater Ponds for Stormwater Treatment and Disposal)