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− | <td>[https://stormwater.pca.state.mn.us/index.php?title=Erosion_prevention_practices_-_temporary_seeding_and_stabilization Temporary seeding | + | <td>[https://stormwater.pca.state.mn.us/index.php?title=Erosion_prevention_practices_-_temporary_seeding_and_stabilization Temporary]/permanent seeding</td> |
<td>Left in place</td> | <td>Left in place</td> | ||
− | <td>Mulch or other natural temporary cover to protect seeded areas also left in place.</td> | + | <td>Mulch or other natural temporary cover to protect seeded areas should also be left in place.</td> |
</tr> | </tr> | ||
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<td>[https://stormwater.pca.state.mn.us/index.php?title=Erosion_prevention_practices_-_natural_and_synthetic_mulches Mulches]</td> | <td>[https://stormwater.pca.state.mn.us/index.php?title=Erosion_prevention_practices_-_natural_and_synthetic_mulches Mulches]</td> | ||
<td>Left in place</td> | <td>Left in place</td> | ||
− | <td>Mulch, hydraulic mulch, and any anchoring materials | + | <td>Mulch, hydraulic mulch, and any anchoring materials must be degradable.</td> |
</tr> | </tr> | ||
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<td>[https://stormwater.pca.state.mn.us/index.php?title=Erosion_prevention_practices_-_tackifiers_and_soil_stabilizers Tackifiers/soil stabilizers]</td> | <td>[https://stormwater.pca.state.mn.us/index.php?title=Erosion_prevention_practices_-_tackifiers_and_soil_stabilizers Tackifiers/soil stabilizers]</td> | ||
<td>Left in place</td> | <td>Left in place</td> | ||
− | <td>If using | + | <td>If using tackifiers and stabilizers (e.g., polyacrylamide or PAM), ensure they are nontoxic to aquatic life (i.e., not cationic).</td> |
</tr> | </tr> | ||
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<td>[https://stormwater.pca.state.mn.us/index.php?title=Erosion_prevention_practices_-_erosion_control_blankets_and_anchoring_devices Erosion control blankets (ECBs)]</td> | <td>[https://stormwater.pca.state.mn.us/index.php?title=Erosion_prevention_practices_-_erosion_control_blankets_and_anchoring_devices Erosion control blankets (ECBs)]</td> | ||
<td>Left in place</td> | <td>Left in place</td> | ||
− | <td> | + | <td>Installed ECBs with emergent vegetation are left in place. May be removed and reused when used as temporary cover without seed on short-duration projects.</td> |
− | May be removed and reused when | ||
− | |||
− | </td> | ||
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>[https://stormwater.pca.state.mn.us/index.php?title=Erosion_prevention_practices_-_turf_reinforcement_mats Turf reinforcement mats (TRMs)]</td> | <td>[https://stormwater.pca.state.mn.us/index.php?title=Erosion_prevention_practices_-_turf_reinforcement_mats Turf reinforcement mats (TRMs)]</td> | ||
<td>Left in place</td> | <td>Left in place</td> | ||
− | <td> | + | <td>Left in place to provide permanent armoring and vegetation support.</td> |
− | </td> | ||
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<td>[https://stormwater.pca.state.mn.us/index.php?title=Sediment_control_practices_-_Perimeter_controls_for_disturbed_areas Perimeter controls]</td> | <td>[https://stormwater.pca.state.mn.us/index.php?title=Sediment_control_practices_-_Perimeter_controls_for_disturbed_areas Perimeter controls]</td> | ||
<td>Varies; most are removed</td> | <td>Varies; most are removed</td> | ||
− | <td>May be left in place if constructed from degradable materials (e.g., fiber rolls/logs). Silt fencing must be removed after upslope areas are stabilized.<br> | + | <td>May be left in place if constructed from degradable materials (e.g., fiber rolls/logs).<br> |
− | BMPs with degradable fill (e.g., sediment control logs filled with compost) may have outer | + | Silt fencing must be removed after upslope areas are stabilized.<br> |
+ | BMPs with degradable fill (e.g., sediment control logs filled with compost) may have outer casing removed and contents left in place. | ||
</td> | </td> | ||
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<td>Varies</td> | <td>Varies</td> | ||
<td>May be left in place if constructed from degradable materials (e.g., fiber rolls/logs).<br> | <td>May be left in place if constructed from degradable materials (e.g., fiber rolls/logs).<br> | ||
+ | Check post-construction stormwater management plan for applicability.<br> | ||
Rock check dams can be spread along ditch bottom after channel is vegetated.<br> | Rock check dams can be spread along ditch bottom after channel is vegetated.<br> | ||
− | + | Non-degradable manufactured products must be removed after stabilization. | |
</td> | </td> | ||
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<td>Varies</td> | <td>Varies</td> | ||
<td>Devices designed for temporary, short-term (e.g., less than one year) use must be removed after stabilization.<br> | <td>Devices designed for temporary, short-term (e.g., less than one year) use must be removed after stabilization.<br> | ||
− | Whether they are left in place as permanent BMPs depends on function and desired aesthetics | + | Whether they are left in place as permanent BMPs depends on function and desired aesthetics. Check post-construction stormwater management plan for applicability. |
</td> | </td> | ||
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<td>[https://stormwater.pca.state.mn.us/index.php?title=Sediment_control_practices_-_Stabilized_earth/soil_berm Stabilized earth/soil berm]</td> | <td>[https://stormwater.pca.state.mn.us/index.php?title=Sediment_control_practices_-_Stabilized_earth/soil_berm Stabilized earth/soil berm]</td> | ||
<td>Varies</td> | <td>Varies</td> | ||
− | <td>Typically removed after stabilization. In some cases, may be left in place if permanently stabilized with vegetation.</td> | + | <td>Typically removed after stabilization. In some cases, may be left in place if permanently stabilized with vegetation. Check post-construction stormwater management plan for applicability.</td> |
</tr> | </tr> | ||
<tr> | <tr> |
Typical recommendations for BMP removal for common construction stormwater BMPs.
Link to this table
BMP category/type | Standard procedure | Applicability and special considerations |
---|---|---|
Erosion prevention practices (stabilization practices) | ||
Temporary/permanent seeding | Left in place | Mulch or other natural temporary cover to protect seeded areas should also be left in place. |
Mulches | Left in place | Mulch, hydraulic mulch, and any anchoring materials must be degradable. |
Tackifiers/soil stabilizers | Left in place | If using tackifiers and stabilizers (e.g., polyacrylamide or PAM), ensure they are nontoxic to aquatic life (i.e., not cationic). |
Erosion control blankets (ECBs) | Left in place | Installed ECBs with emergent vegetation are left in place. May be removed and reused when used as temporary cover without seed on short-duration projects. |
Turf reinforcement mats (TRMs) | Left in place | Left in place to provide permanent armoring and vegetation support. |
Erosion prevention practices (other) | ||
Riprap | Left in place | Typically serves a permanent function for armoring, stabilizing, and protecting soil against erosion. |
Sediment control practices | ||
Vehicle tracking BMPs | Removed | Removed after final site stabilization or after no longer needed (e.g., vehicles no longer entering or existing site). |
Perimeter controls | Varies; most are removed | May be left in place if constructed from degradable materials (e.g., fiber rolls/logs). Silt fencing must be removed after upslope areas are stabilized. |
Check dams | Varies | May be left in place if constructed from degradable materials (e.g., fiber rolls/logs). Check post-construction stormwater management plan for applicability. |
Diversion barrier controls | Varies; most are removed | In general, all are removed after stabilization. In special cases, such as where removal may damage structures or foundation soils, cofferdams may be left in place. |
Inlet protection | Removed | Must be removed after stabilization. |
Outlet energy dissipation | Varies | Devices designed for temporary, short-term (e.g., less than one year) use must be removed after stabilization. Whether they are left in place as permanent BMPs depends on function and desired aesthetics. Check post-construction stormwater management plan for applicability. |
Sediment traps/basins | Varies | Temporary sediment traps are removed after stabilization. Temporary sediment basins may be converted to permanent stormwater management basins after stabilization. |
Stabilized earth/soil berm | Varies | Typically removed after stabilization. In some cases, may be left in place if permanently stabilized with vegetation. Check post-construction stormwater management plan for applicability. |
Surface water protection practices | ||
Buffer zones | Left in place | Always preserved on site |
Construction stormwater treatment practices | ||
Dewatering (including chemical treatment and sediment filtration) | Removed | Dewatering practices are operated during construction activity and may be removed after construction ceases and site is stabilized. |
Practices to minimize sediment discharge | ||
Diversion and working in the dry | Removed | Removed after construction is complete and stream channel and site are stabilized. |
Temporary stream crossing | Removed | Removed after construction is complete and stream channel and site are stabilized. |
Stabilized construction exit | Removed | Removed after construction is complete and construction equipment/materials have been removed. Grade and stabilize area after removal. |