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Minnesota Stormwater Manual

Difference between revisions of "Situations where infiltration is prohibited or not recommended"

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<td>BMP is < 100 feet from drinking well in sensitive aquifer</td>
+
<td>BMP is < 100 feet from drinking well in sensitive aquifer<sup>3</sup></td>
 
<td>X</td>
 
<td>X</td>
 
<td></td>
 
<td></td>
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</tr>
 
</tr>
 
<tr>
 
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<td>BMP is < 50 feet from drinking well in a non-sensitive aquifer</td>
+
<td>BMP is < 50 feet from drinking well in a non-sensitive aquifer<sup>3</sup></td>
 
<td>X</td>
 
<td>X</td>
 
<td></td>
 
<td></td>
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<tr>
 
<tr>
 
<td>BMP receives discharges from vehicle fueling and maintenance areas</td>
 
<td>BMP receives discharges from vehicle fueling and maintenance areas</td>
−
<td>if CGP applies<sup>2</sup></td>
 
 
<td>X</td>
 
<td>X</td>
 +
<td></td>
 
<td></td>
 
<td></td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>There is less than 3 of separation to bedrock or saturated soil</td>
 
<td>There is less than 3 of separation to bedrock or saturated soil</td>
−
<td>if CGP applies</td>
+
<td>if CGP applies<sup>2</sup></td>
 +
<td>X</td>
 
<td></td>
 
<td></td>
−
<td>X</td>
 
 
</tr>
 
</tr>
 
<tr>
 
<tr>
−
<td>BMP receives discharges from certain industrial facilities</td>
+
<td>BMP receives discharges from certain industrial facilities<sup>4</sup></td>
 
<td>if CGP applies</td>
 
<td>if CGP applies</td>
 
<td></td>
 
<td></td>
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</tr>
 
</tr>
 
<tr>
 
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<td>BMP receives discharges from areas of contaminated soil</td>
+
<td>BMP is in areas where high levels of contaminants in soil or groundwater will be mobilized by the infiltrating stormwater</td>
 
<td>if CGP applies</td>
 
<td>if CGP applies</td>
 +
<td></td>
 
<td>X</td>
 
<td>X</td>
−
<td></td>
 
 
</tr>
 
</tr>
 
<tr>
 
<tr>
−
<td>BMP is located in D soils, unless infiltration allowed by LGU</td>
+
<td>BMP is located in D soils</td>
 
<td>if CGP applies</td>
 
<td>if CGP applies</td>
 
<td></td>
 
<td></td>
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</tr>
 
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<td>BMP is 1,000 feet up-gradient or 100 feet down-gradient of active karst, unless infiltration allowed by LGU</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>
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</tr>
 
</tr>
 
<tr>
 
<tr>
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<td>BMP is located within a DWSMA, unless infiltration allowed by LGU</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>X</td>
 
<td></td>
 
<td></td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
−
<td>BMP is located within 1 year travel time of drinking supply well</td>
+
<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></td>
+
<td>if CGP applies, unless a higher engineering review indicates infiltration is acceptable</td>
 
<td>X</td>
 
<td>X</td>
 
<td></td>
 
<td></td>
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<td>BMP is located in soils with infiltration rate > 8.3 in/hr</td>
 
<td>BMP is located in soils with infiltration rate > 8.3 in/hr</td>
 
<td>if CGP applies</td>
 
<td>if CGP applies</td>
 +
<td></td>
 +
<td>X</td>
 +
</tr>
 +
<tr>
 +
<td>BMP is located within 1 year travel time of drinking supply well</td>
 +
<td></td>
 
<td></td>
 
<td></td>
 
<td>X</td>
 
<td>X</td>
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</tr>
 
</tr>
 
<tr>
 
<tr>
−
<td>BMP located less than 200 feet from toe of slope that exceeds 20%</td>
+
<td>BMP located less than 200 feet from crest of slope that exceeds 20%</td>
 
<td></td>
 
<td></td>
 
<td>X</td>
 
<td>X</td>
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</tr>
 
</tr>
 
<tr>
 
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<td>A mound beneath the BMP extends into the BMP</td>
+
<td>A groundwater mound formed beneath the BMP during infiltration extends into the BMP</td>
 
<td></td>
 
<td></td>
 
<td>X</td>
 
<td>X</td>
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</table>
 
</table>
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<font size=1><sup>see discussion below for conditions under which infiltration is acceptable.</sup><br>
+
<font size=1><sup>1</sup>see [https://stormwater.pca.state.mn.us/index.php?title=Decision_tools_for_stormwater_infiltration#Determine_if_infiltration_is_not_prohibited_but_is_not_recommended discussion for conditions under which infiltration is acceptable].<br>
−
<sup>2</sup>CGP = Construction Stormwater General Permit</font size>
+
<sup>2</sup>CGP = [https://stormwater.pca.state.mn.us/index.php?title=2018_Minnesota_Construction_Stormwater_Permit Construction Stormwater General Permit]<br>
 +
<sup>3</sup>See [https://www.revisor.mn.gov/rules/?id=4725.4450 Minnesota Rules Chapter 4725]<br>
 +
<sup>4</sup>To determine if infiltration is allowed for a specific industrial sector or subsector, go to the [http://stormwater.pca.state.mn.us/index.php/PART_VII._SECTOR-SPECIFIC_REQUIREMENTS 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'')</font size>

Latest revision as of 20:17, 18 January 2024

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 X
There is less than 3 of separation to bedrock or saturated soil if CGP applies2 X
BMP receives discharges from certain industrial facilities4 if CGP applies
BMP is in 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 X
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 X
BMP is located in soils with infiltration rate > 8.3 in/hr 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 crest 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 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)

Retrieved from "https://stormwater.pca.state.mn.us/index.php?title=Situations_where_infiltration_is_prohibited_or_not_recommended&oldid=68787"

This page was last edited on 18 January 2024, at 20:17.