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→Soil Characterization Testing
Sampling and testing is also recommended as a part of Verification inspections, to determine if the BMP is being adequately maintained and if soil characteristics are still within acceptable ranges. It may also be done as part of Forensic inspection and Testing (FIT) work to help diagnose the cause of poor vegetation cover, drainage or treatment performance and decide on corrective actions.
Sampling and testing is also recommended as a part of Verification inspections, to determine if the BMP is being adequately maintained and if soil characteristics are still within acceptable ranges. It may also be done as part of Forensic inspection and Testing (FIT) work to help diagnose the cause of poor vegetation cover, drainage or treatment performance and decide on corrective actions.
{| class="wikitable" style="width: 900px;"
|+''' Critical soil characteristics, acceptance criteria and tests by LID BMP type'''
|-
!<br>'''LID BMP Type'''
!<br>'''Soil Characteristic'''
!<br>'''Acceptance Criteria*'''
!<br>'''Test'''
|-
|rowspan="9"|'''[[Bioretention]]/[[Bioswales]]/[[Dry Swales]]'''
|-
|Texture**
|Loamy Sand or Sandy Loam; 70 to 88% sand-sized particles; 12 to 30% silt- and clay-sized particles; <20% clay-sized particles.
|Particle-Size Distribution (PSD), or % Sand/Silt/Clay (i.e., Soil Texture) plus Sand Fraction
|-
|Organic Matter (OM)
|3 to 10% by dry weight**
|Walkley-Black method when OM <7.5% or Loss On Ignition (LOI) method when OM ≥7.5%***
|
|rowspan="5"|'''[[Inlets|Inlet]]'''
|-
|Inlet/Flow Spreader Structural Integrity
|
|x
|x
|x
|-
|Inlet/Flow Spreader Structural Integrity
|x
|x
|x
|x
|-
|Pretreatment sediment accumulation
|x
|x
|x
|
|-
|Inlet erosion
|
|x
|x
|
|-
|rowspan="4"|'''Perimeter'''
|-
|BMP dimensions
|x
|x
|
|x
|-
|Side slope erosion
|
|x
|x
|
|-
|Surface ponding area
|x
|x
|
|x
|-
|rowspan="9"|'''[[Bioretention: Filter media|Filter Bed]]'''
|-
|Standing water
|
|x
|x
|x
|-
|Trash
|
|x
|x
|
|-
|Filter bed erosion
|
|x
|x
|
|-
|Mulch depth
|x
|x
|x
|x
|-
|Filter bed sediment accumulation
|
|x
|x
|x
|-
|Surface ponding depth
|x
|x
|
|x
|-
|Filter bed surface sinking
|
|x
|x
|x
|-
|Check dams
|x
|x
|x
|x
|-
|rowspan="4"|'''[[Vegetation|Planting Area]]'''
|-
|Vegetation cover
|x
|x
|x
|x
|-
|Vegetation condition
|
|x
|x
|
|-
|Vegetation composition
|x
|x
|x
|
|-
|rowspan="4"|'''[[Overflow|Outlet]]'''
|-
|Monitoring well condition
|x
|x
|x
|x
|-
|Sub-drain/Perforated pipe obstruction
|
|x
|
|x
|-
|Overflow outlet obstruction
|x
|x
|x
|x
|-
|}<br>
</br>
[[File:Soil testing indicators.PNG|thumb|300px|The image above shows a manual soil corer, a split soil core sampler kit which preserves the soil sample for further testing (i.e., bulk density) and acrylic core sample tubes. All examples of tools to be use for soil characterization testing. Source: (TRCA, 2016).<ref>STEP. 2016. Low Impact Development Stormwater Management Practice Inspection and Maintenance Guide. https://sustainabletechnologies.ca/app/uploads/2016/08/LID-IM-Guide-2016-1.pdf</ref>.]]
{| class="wikitable" style="width: 900px;"
|+'''Testing Indicators Framework - Bioretention/Swales'''
|-
!<br>'''Component'''
!<br>'''Indicators'''
!<br>'''Construction Inspection'''
!<br>'''Assumption Inspection'''
!<br>'''Routine Operation Inspection'''
!<br>'''Verification Inspection'''
|-
|rowspan="6"|'''Testing Indicators'''
|-
|Soil characterization testing
|x
|x
|
|(x)
|-
|Sediment accumulation testing
|x
|x
|x
|x
|-
|Surface infiltration rate testing
|
|x
|
|(x)
|-
|Natural or simulated storm event testing
|
|x
|
|(x)
|-
|Continuous monitoring
|
|x
|
|(x)
|-
|colspan="7" style="text-align: center;" |'''<u><span title=>Note:''' (x) denotes indicators to be used for Performance Verification inspections only (i.e., not for Maintenance Verification inspections) </span></u>
|-
|}
==Sediment Accumulation Testing==
==Sediment Accumulation Testing==