Difference between revisions of "Typical recommendations for BMP removal for common construction stormwater BMPs"
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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>Materials must be degradable. | + | <td>Materials must be degradable.<br> |
| − | May be removed and reused when applied on short-duration projects. | + | May be removed and reused when applied on short-duration projects.<br> |
Degradation rate depends on type and materials; see Erosion control blankets and anchoring devices. | Degradation rate depends on type and materials; see Erosion control blankets and anchoring devices. | ||
</td> | </td> | ||
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<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>In contrast to ECBs, all TRMs are non-degradable and synthetic. | + | <td>In contrast to ECBs, all TRMs are non-degradable and synthetic. Left in place to provide permanent armoring and vegetation support. |
| − | Left in place to provide permanent armoring and vegetation support. | ||
</td> | </td> | ||
</tr> | </tr> | ||
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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. | + | <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> |
BMPs with degradable fill (e.g., sediment control logs filled with compost) may have outer shell removed and contents left in place. | BMPs with degradable fill (e.g., sediment control logs filled with compost) may have outer shell removed and contents left in place. | ||
</td> | </td> | ||
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<td>[https://stormwater.pca.state.mn.us/index.php?title=Sediment_control_practices_-_Check_dams_(ditch_checks,_ditch_dikes) Check dams]</td> | <td>[https://stormwater.pca.state.mn.us/index.php?title=Sediment_control_practices_-_Check_dams_(ditch_checks,_ditch_dikes) Check dams]</td> | ||
<td>Varies</td> | <td>Varies</td> | ||
| − | <td>May be left in place if constructed from degradable materials (e.g., fiber rolls/logs). | + | <td>May be left in place if constructed from degradable materials (e.g., fiber rolls/logs).<br> |
| − | Rock check dams can be spread along ditch bottom after channel is vegetated. | + | Rock check dams can be spread along ditch bottom after channel is vegetated.<br> |
Manufactured products must be removed after stabilization. | Manufactured products must be removed after stabilization. | ||
</td> | </td> | ||
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<td>[https://stormwater.pca.state.mn.us/index.php?title=Sediment_control_practices_-_Outlet_energy_dissipation Outlet energy dissipation]</td> | <td>[https://stormwater.pca.state.mn.us/index.php?title=Sediment_control_practices_-_Outlet_energy_dissipation Outlet energy dissipation]</td> | ||
<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. | + | <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 | ||
</td> | </td> | ||
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<td>[https://stormwater.pca.state.mn.us/index.php?title=Sediment_control_practices_-_Sediment_traps_and_basins Sediment traps/basins]</td> | <td>[https://stormwater.pca.state.mn.us/index.php?title=Sediment_control_practices_-_Sediment_traps_and_basins Sediment traps/basins]</td> | ||
<td>Varies</td> | <td>Varies</td> | ||
| − | <td>Temporary sediment traps are removed after stabilization. | + | <td>Temporary sediment traps are removed after stabilization.<br> |
Temporary sediment basins may be converted to permanent stormwater management basins after stabilization. | Temporary sediment basins may be converted to permanent stormwater management basins after stabilization. | ||
</td> | </td> | ||
Revision as of 18:08, 17 April 2019
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 seeding | Left in place | Mulch or other natural temporary cover to protect seeded areas also left in place. |
| Mulches | Left in place | Mulch, hydraulic mulch, and any anchoring materials (e.g., nets) must be degradable. |
| Tackifiers/soil stabilizers | Left in place | If using synthetic materials such as Polyacrylamide (PAM), ensure they are nontoxic to aquatic life (i.e., not cationic). |
| Erosion control blankets (ECBs) | Left in place | Materials must be degradable. May be removed and reused when applied on short-duration projects. |
| Turf reinforcement mats (TRMs) | Left in place | In contrast to ECBs, all TRMs are non-degradable and synthetic. 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. BMPs with degradable fill (e.g., sediment control logs filled with compost) may have outer shell removed and contents left in place. |
| Check dams | Varies | May be left in place if constructed from degradable materials (e.g., fiber rolls/logs). Rock check dams can be spread along ditch bottom after channel is vegetated. |
| 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 |
| 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. |
| 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. |