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Construction: erosion and sediment control measures (view source)
Revision as of 14:21, 21 July 2022
, 2 years agoCreated page with "Establish required perimeter controls, including erosion and sediment control (ESC) measures, prior to construction and adjust accordingly during construction. ESC measures come in two basic types: structural ESC, which slows and holds runoff from the disturbed area, dissipating erosive forces, promoting ponding, and allowing suspended particles to settle out; and non-structural ESC, which primarily minimizes the exposure time of stripped soils. STEP’s Erosion and Sedi..."
Establish required perimeter controls, including erosion and sediment control (ESC) measures, prior to construction and adjust accordingly during construction. ESC measures come in two basic types: structural ESC, which slows and holds runoff from the disturbed area, dissipating erosive forces, promoting ponding, and allowing suspended particles to settle out; and non-structural ESC, which primarily minimizes the exposure time of stripped soils. STEP’s Erosion and Sediment Control Guide contains detailed guidance on the design, installation, inspection, maintenance, and decommissioning of ESC measures.
For non-structual ESC measures, be sure to:
*Stage clearing and grubbing to minimize exposure of stripped soils.
*Watch the weather and adjust plans accordingly.
*Manage and demarcate heavy equipment routes away from LID practices.
*Use simple, common-sense methods, such as scarifying exposed soils perpendicular to the grade to prevent the development of rills.
*Create and use a pollution prevention plan for any fuels or solvents.
Generally, all exposed soils that are not being actively worked on must have temporary erosion protection or permanent cover within 7 days for slopes 3:1 or greater and 14 days for slopes 3:1 or lesser and 14 days for slopes 3:1 or flatter. This should apply to all exposed soil areas year-round and until the site is stabilized. <br>
The table below gives practical advice on installing structural ESC measures for contractors, inspectors, and those who are new to construction and ESC practices.
{|class="wikitable" style="width: 1280px"
|+'''Bioretention/Swales: Key Components, Descriptions and Routine I&M Requirements'''
|-
!style="width: 500px"|Structural ESC measure
!style="width: 1500px"|Do
!style="width: 1500px"|Don't
!style="width: 500px"|<span style="color:green">('''Pass''')</span> Photo Example
!style="width: 550px"|<span style="color:red">('''Fail''')</span> Photo Example
|-
|'''Sediment fencing'''
|
Stake it in, support it, and double it up adjacent to natural heritage features.
|
Leave vulnerable areas with insufficient supports.
|[[File:Pass.PNG|300px|thumb|center|CDA has not changed in size or land cover. Sediment, trash or debris is not accumulating and point sources of contaminants are not visible.]]
|[[File:ESC insufficient support.JPG|280px|thumb|center|This sediment fencing was not staked in at the likely point of failure, resulting in the release of sediment into an adjacent natural heritage feature. (Photo Source: North Carolina Cooperative Extension)]]
|}
For non-structual ESC measures, be sure to:
*Stage clearing and grubbing to minimize exposure of stripped soils.
*Watch the weather and adjust plans accordingly.
*Manage and demarcate heavy equipment routes away from LID practices.
*Use simple, common-sense methods, such as scarifying exposed soils perpendicular to the grade to prevent the development of rills.
*Create and use a pollution prevention plan for any fuels or solvents.
Generally, all exposed soils that are not being actively worked on must have temporary erosion protection or permanent cover within 7 days for slopes 3:1 or greater and 14 days for slopes 3:1 or lesser and 14 days for slopes 3:1 or flatter. This should apply to all exposed soil areas year-round and until the site is stabilized. <br>
The table below gives practical advice on installing structural ESC measures for contractors, inspectors, and those who are new to construction and ESC practices.
{|class="wikitable" style="width: 1280px"
|+'''Bioretention/Swales: Key Components, Descriptions and Routine I&M Requirements'''
|-
!style="width: 500px"|Structural ESC measure
!style="width: 1500px"|Do
!style="width: 1500px"|Don't
!style="width: 500px"|<span style="color:green">('''Pass''')</span> Photo Example
!style="width: 550px"|<span style="color:red">('''Fail''')</span> Photo Example
|-
|'''Sediment fencing'''
|
Stake it in, support it, and double it up adjacent to natural heritage features.
|
Leave vulnerable areas with insufficient supports.
|[[File:Pass.PNG|300px|thumb|center|CDA has not changed in size or land cover. Sediment, trash or debris is not accumulating and point sources of contaminants are not visible.]]
|[[File:ESC insufficient support.JPG|280px|thumb|center|This sediment fencing was not staked in at the likely point of failure, resulting in the release of sediment into an adjacent natural heritage feature. (Photo Source: North Carolina Cooperative Extension)]]
|}