Changes

==Construction Inspection Tasks==

==Construction Inspection Tasks==

[[File:Protecting swale durign construction.PNG|thumb|400px|The diagram above depicts the use of an enhanced swale as a temporary detention basin during construction. This practice is avoided at all costs as it can lead to subgrade clogging and compaction, but in the case where LIDs must be used for construction stormwater detention due to site constraints, protection measures can be applied to prevent accumulated sediment from migrating into the subgrade when an LID is first being developed. This method would have to be outlined on the inspection sheet specifically to ensure construction inspection tasks include addressing its condition through all three sequences (Source: TRCA, 2019)<ref name="example1" />]]

[[File:Protecting swale durign construction.PNG|thumb|750px|The diagram above depicts the use of an enhanced swale as a temporary detention basin during construction. This practice is avoided at all costs as it can lead to subgrade clogging and compaction, but in the case where LIDs must be used for construction stormwater detention due to site constraints, protection measures can be applied to prevent accumulated sediment from migrating into the subgrade when an LID is first being developed. This method would have to be outlined on the inspection sheet specifically to ensure construction inspection tasks include addressing its condition through all three sequences (Source: TRCA, 2019)<ref name="example1" />]]

Construction inspections take place during several points in the construction sequence, specific to the type of LID BMP, but at a minimum should be done '''weekly''' and include the following:

Construction inspections take place during several points in the construction sequence, specific to the type of LID BMP, but at a minimum should be done '''weekly''' and include the following:

# During site preparation, prior to BMP excavation and grading to ensure the CDA is stabilized or that adequate ESCs or flow diversion devices are in place and confirm that construction materials meet design specifications

# During site preparation, prior to BMP excavation and grading to ensure the CDA is stabilized or that adequate ESCs or flow diversion devices are in place and confirm that construction materials meet design specifications

# At completion of excavation and grading, prior to installation of pipes/sewers and backfilling to ensure depths, slopes and elevations are acceptable

# At completion of excavation and grading, prior to installation of pipes/sewers and backfilling to ensure depths, slopes and elevations are acceptable

# Prior to hand-off points in the construction sequence when the contractor is responsible for the work changes (i.e., hand-offs between the storm sewer servicing, paving, building and landscaping contractors

# After every large storm event (e.g., 15 mm rainfall depth or greater) to ensure [https://sustainabletechnologies.ca/app/uploads/2020/01/ESC-Guide-for-Urban-Construction_FINAL.pdf Erosion Sediment Controls (ESCs)] and pretreatment or flow diversion devices are functioning and adequately maintained. View the table below, which describes critical points during the construction sequence when inspections should be performed prior to proceeding further. You can also download and print the table [https://wikidev.sustainabletechnologies.ca/images/d/db/Construction_Inspection_Enhanced_Swale.pdf '''here''']<br>

# Prior to hand-off points in the construction sequence when the contractor responsible for the work changes (i.e., hand-offs between the storm sewer servicing, paving, building and landscaping contractors)

# After every large storm event (e.g., 15 mm rainfall depth or greater) to ensure [https://sustainabletechnologies.ca/app/uploads/2020/01/ESC-Guide-for-Urban-Construction_FINAL.pdf Erosion Sediment Controls (ESCs)] and pretreatment or flow diversion devices are functioning and adequately maintained. View the table below, which describes critical points during the construction sequence when inspections should be performed prior to proceeding further. You can also download and print the table [https://wikidev.sustainabletechnologies.ca/images/7/7f/Construction_Inspection.pdf '''here''']<br>

{| class="wikitable" style="width: 1000px;"

{| class="wikitable" style="width: 1000px;"

|+'''Bioretention/Swales: Construction Inspections'''

|+'''Enhanced Swales: Construction Inspections'''

|-

|-

!<br>'''Construction Sequence Step & Timing'''

!<br>'''Construction Sequence Step & Timing'''

|

|

|-

|-

|rowspan="4"|'''BMP Excavation and Grading''' - prior to installation of pipes/sewers and backfilling

|rowspan="4"|'''BMP Excavation and Grading''' - prior to landscaping

|Excavation location, footprint, depth and slopes are acceptable  

|Excavation location, footprint, depth and slopes are acceptable

|

|

|-

|-

|-

|-

|Excavation bottom and sides roughened to reduce smearing and compaction  

|Excavation bottom and sides roughened to reduce smearing and compaction  

|

|

|-

|-

|rowspan="4"|'''Landscaping''' – after final grading, prior to planting

|rowspan="4"|'''Landscaping''' – after final grading, prior to planting

|Filter bed depth and surface elevations at inlets are acceptable  

|Topsoil depth, degree of compaction and surface elevations at inlets and outlets are acceptable  

|

|

|-

|-

|Maximum surface ponding depth is acceptable

|Maximum surface ponding depth is acceptable  

|

|

|-

|-