Difference between revisions of "Situations where infiltration is prohibited or not recommended"
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| − | <td>BMP is located in D soils | + | <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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| − | <td>BMP is 1,000 feet up-gradient or 100 feet down-gradient of active karst | + | <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: | ||
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| − | <td>BMP is located within a DWSMA | + | <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)