Difference between revisions of "Infiltration guidelines for potential stormwater hotspots"
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<td>Landscaping</td> | <td>Landscaping</td> | ||
| − | <td>Infiltration is acceptable provided there is no run-on or co-mingling from higher pollutant loading areas and appropriate pretreatment is provided for the specified practice. Chemical management is needed to limit the amount of fertilizer and pesticides.</td> | + | <td>Infiltration is acceptable provided there is no run-on or co-mingling from higher pollutant loading areas and appropriate [[Pre-treatment|pretreatment]] is provided for the specified practice. Chemical management is needed to limit the amount of fertilizer and pesticides.</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>Downspouts</td> | <td>Downspouts</td> | ||
| − | <td>Infiltration is | + | <td>Infiltration is acceptable provided there is no run-on or co-mingling from higher pollutant loading areas, there is no polluting exhaust from a vent or stack deposits on the rooftop, and there is appropriate pretreatment provided for the specific practice. </td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>Vehicle operations</td> | <td>Vehicle operations</td> | ||
| − | <td>Infiltration is | + | <td>Infiltration is acceptable with the following provisions: |
*No run-on from higher pollutant loading areas | *No run-on from higher pollutant loading areas | ||
| − | *Limited salt application or | + | *Limited salt application or use of alternative deicers |
| − | *Enhanced | + | *Enhanced pretreatment requirements such as (suggested unless better local information is available) minimum vegetative filter lengths of 20 feet, maximum velocity in conveyance channels to infiltration practice of one foot per second, plunge pools and sediment basins/chambers with volumes of at least 25% of the water quality volume |
*Only daily “commuter” parking areas and no long-term car/truck storage sites. | *Only daily “commuter” parking areas and no long-term car/truck storage sites. | ||
</td> | </td> | ||
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<td>Waste management and outdoor material storage<sup>1</sup></td> | <td>Waste management and outdoor material storage<sup>1</sup></td> | ||
| − | <td>Infiltration is not | + | <td>Infiltration is typically not recommended but may be utilized if spill prevention and containment measures are in place, such as catch basin inserts and oil and grit separators; or if redundant treatment is provided, such as filtering prior to infiltration. Infiltration should be prohibited in areas of exposed salt and mixed sand/salt storage and processing.</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>Loading docks<sup>1</sup></td> | <td>Loading docks<sup>1</sup></td> | ||
| − | <td>Infiltration is not | + | <td>Infiltration is typically not recommended but may be utilized if spill prevention and containment measures are in place, such as catch basin inserts and oil and grit separators; or if redundant treatment is provided, such as filtering prior to infiltration.</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| Line 38: | Line 38: | ||
<tr> | <tr> | ||
<td>Highways<sup>1</sup></td> | <td>Highways<sup>1</sup></td> | ||
| − | <td>Infiltration is possible where enhanced | + | <td>Infiltration is possible where enhanced pretreatment is provided. Where highways are within source water protection areas and other sensitive watersheds, additional measures should be in place such as spill prevention and containment measures (e.g., non-clogging catch basin inserts and oil and grit separators.</td> |
</tr> | </tr> | ||
</table> | </table> | ||
<font size=1><sup>1</sup>indicates operational area with likelihood of having higher pollutant loadings</font size> | <font size=1><sup>1</sup>indicates operational area with likelihood of having higher pollutant loadings</font size> | ||
Revision as of 19:10, 24 September 2015
Infiltration guidelines for potential stormwater hotspots.
Link to this table.
| Operational area | Potential infiltration guidelines |
|---|---|
| Landscaping | Infiltration is acceptable provided there is no run-on or co-mingling from higher pollutant loading areas and appropriate pretreatment is provided for the specified practice. Chemical management is needed to limit the amount of fertilizer and pesticides. |
| Downspouts | Infiltration is acceptable provided there is no run-on or co-mingling from higher pollutant loading areas, there is no polluting exhaust from a vent or stack deposits on the rooftop, and there is appropriate pretreatment provided for the specific practice. |
| Vehicle operations | Infiltration is acceptable with the following provisions:
|
| Waste management and outdoor material storage1 | Infiltration is typically not recommended but may be utilized if spill prevention and containment measures are in place, such as catch basin inserts and oil and grit separators; or if redundant treatment is provided, such as filtering prior to infiltration. Infiltration should be prohibited in areas of exposed salt and mixed sand/salt storage and processing. |
| Loading docks1 | Infiltration is typically not recommended but may be utilized if spill prevention and containment measures are in place, such as catch basin inserts and oil and grit separators; or if redundant treatment is provided, such as filtering prior to infiltration. |
| Vehicle fueling1 | Infiltration is not allowed by the MPCA for new construction under the CGP. |
| Highways1 | Infiltration is possible where enhanced pretreatment is provided. Where highways are within source water protection areas and other sensitive watersheds, additional measures should be in place such as spill prevention and containment measures (e.g., non-clogging catch basin inserts and oil and grit separators. |
1indicates operational area with likelihood of having higher pollutant loadings