m
m
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</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Building/structure</td>
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<td>Building/structure/property line<sup>2</sup></td>
 
<td>10</td>
 
<td>10</td>
 
<td>Recommended</td>
 
<td>Recommended</td>
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</tr>
 
</tr>
 
</table>
 
</table>
<font size=1><sup>1</sup> Required under the Construction Stormwater General Permit</font size>
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<font size=1><sup>1</sup> Required under the Construction Stormwater General Permit<br>
 +
<sup>2</sup>Minimum with slopes directed away from the building</font size>

Revision as of 19:44, 1 August 2016

Required and recommended minimum vertical and horizontal separation distances. This represents the minimum distance from the infiltration practice to the structure of concern. If the structure is above-ground, the distance is measured from the edge of the BMP to the structure. If the structure is underground, the vertical separation distance represents the distance from the point of infiltration through the bottom of the system to the structure, while the horizontal separation (often called setback) distance is the shortest distance from the edge of the system to the structure.
Link to this table

Structure Distance (feet) Requirement or recommendation Note(s)
Vertical Saturated soil 3 Requirement1
Bedrock 3 Requirement1
Horizontal Public supply well 100 for sensitive wells; 50 for others Requirement
Building/structure/property line2 10 Recommended
Surface water none unless local requirements exist If nearby stream is impaired for chloride, see [1]
Septic system 35 Recommended
Contaminated soil/groundwater No specific distance. Infiltration must not mobilize contaminants.
Slope 200 Recommended from toe of slope >= 20%
Karst 1000 up-gradient 100 down-gradient Requirement1 Active karst

1 Required under the Construction Stormwater General Permit
2Minimum with slopes directed away from the building