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_-_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> |
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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> |
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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> |
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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> | ||
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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> | + | <td>Left in place to provide permanent armoring and vegetation support.</td> |
| − | </td> | ||
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<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). 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 | + | BMPs with degradable fill (e.g., sediment control logs filled with compost) may have outer casing removed and contents left in place. |
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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. | |
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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. |
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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> |
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Revision as of 17:57, 13 June 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/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. BMPs with degradable fill (e.g., sediment control logs filled with compost) may have outer casing removed and contents left in place. |
| 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. |