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→Design verification and site walk-through
==Design verification and site walk-through==
==Design verification and site walk-through==
When the design is 90% complete, the project manager (PM) should conduct a walk-through of the site to verify that the designs match site conditions. This site walk-through is a critical step in the transition from design to construction and helps the project manager plan for future pre-bid or pre-construction meetings. Think carefully about how a contractor will be able to build the LID practice. At this stage, determine if the design drawings and construction notes address specific LID construction requirements, and determine whether they contain inaccuracies or are missing detail. The table below identifies details key points and considerations for the walk-through.
When the design is 90% complete, the project manager (PM) should conduct a walk-through of the site to verify that the designs match site conditions. This site walk-through is a critical step in the transition from design to construction and helps the project manager plan for future pre-bid or pre-construction meetings. Think carefully about how a contractor will be able to build the LID practice. At this stage, determine if the design drawings and construction notes address specific LID construction requirements, and determine whether they contain inaccuracies or are missing detail. The table below identifies and details key verification points and considerations for the site walk-through.
{|class="wikitable"
{|class="wikitable"
|-
|-
|Existing and planned infrastructure/utilities||
|Existing and planned infrastructure/utilities||
*Confirm accuracy of design drawings.
*Confirm accuracy of design [[drawings]].
*Are there any unmarked utilities not detailed within the drawing set?
*Are there any unmarked utilities not detailed within the drawing set?
|-
|-
|Property boundaries and building foundations||
|Property boundaries and building foundations||
*Confirm accuracy of design drawings.
*Confirm accuracy of design [[drawings]].
*Do fence lines align with property boundaries?
*Do fence lines align with property boundaries?
|-
|-
===Inspection plan===
===Inspection plan===
[[File:Construction duties flowchart.png|450px|right|Communication about inspection points between the owner, the engineer, and the contractor are critical for a successful project.]]
[[File:Construction duties flowchart.png|thumb|450px|right|Communication about inspection points between the owner, the engineer, and the contractor are critical for a successful project (adapted from TRCA, 2016).<ref>TRCA. 2016. Low Impact Development Stormwater Management Practice Inspection and Maintenance Guide. Version 1.0. Figure 6.3. https://sustainabletechnologies.ca/app/uploads/2016/08/LID-IM-Guide-2016-1.pdf</ref>]]
The [[inspection and maintenance]] page gives detailed guidance on how to conduct construction inspections for LID practices. Generally, construction inspections should be continuous as the work progresses. If this isn’t possible, critical inspection points are:
The [[inspection and maintenance]] page gives detailed guidance on how to conduct construction inspections for LID practices. Generally, construction inspections should be continuous as the work progresses. If this isn’t possible, critical inspection points are:
*finishing grades
*finishing grades
*surface treatment installation: pavers, plants, porous concrete, etc.
*surface treatment installation: pavers, plants, porous concrete, etc.
*after rain events (see ESC inspection and maintenance)
*after rain events (see [https://s3-ca-central-1.amazonaws.com/trcaca/app/uploads/2020/01/30145157/ESC-Guide-for-Urban-Construction_FINAL.pdf ESC inspection and maintenance])
*whenever sub-contractors or utilities begin work (hand-off points)
*whenever sub-contractors or utilities begin work (hand-off points)
[[File:ESC perpendicular grooves.jpg|400px|thumb|right|Grooves perpendicular to the grade help prevent the development of rills. (Photo source: CVC, 2022)]]
[[File:ESC perpendicular grooves.jpg|400px|thumb|right|Grooves perpendicular to the grade help prevent the development of rills. (Photo source: CVC, 2022)]]
STEP's [https://sustainabletechnologies.ca/home/urban-runoff-green-infrastructure/healthy-soils/construction-specifications-for-implementing-compost-amended-planting-soil-in-ontario/ Erosion and Sediment Control Guide for Urban Construction]]<ref> STEP. 2019. Erosion and Sediment Control Guide for Urban Construction. https://sustainabletechnologies.ca/home/urban-runoff-green-infrastructure/healthy-soils/construction-specifications-for-implementing-compost-amended-planting-soil-in-ontario/</ref> contains detailed guidance on the design, installation, inspection, maintenance, and decommissioning of ESC measures. This section gives practical advice on structural and non-structural ESC for contractors, inspectors, and those who are new to construction and ESC practices.
STEP's [https://sustainabletechnologies.ca/home/urban-runoff-green-infrastructure/healthy-soils/construction-specifications-for-implementing-compost-amended-planting-soil-in-ontario/ Erosion and Sediment Control Guide for Urban Construction]<ref> STEP. 2019. Erosion and Sediment Control Guide for Urban Construction. https://sustainabletechnologies.ca/home/urban-runoff-green-infrastructure/healthy-soils/construction-specifications-for-implementing-compost-amended-planting-soil-in-ontario/</ref> contains detailed guidance on the design, installation, inspection, maintenance, and decommissioning of ESC measures. This section gives practical advice on structural and non-structural ESC for contractors, inspectors, and those who are new to construction and ESC practices.
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.
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.
At these inspections, keep an eye out for accumulated sediment, worn materials, compliance with the project's staging plan, and potential failure points.
At these inspections, keep an eye out for accumulated sediment, worn materials, compliance with the project's staging plan, and potential failure points.
[[File:ESC ponding 2.png|300px|thumb|left|Ponding in front of this catchbasin indicates that this ESC inlet control is working. Ponding water allows for suspended sediments to settle. (Photo source: CISEC)]]
[[File:ESC ponding 2.png|575px|thumb|left|Ponding in front of this catchbasin indicates that this ESC inlet control is working. Ponding water allows for suspended sediments to settle. (Photo source: CISEC)]]
[[File:ESC ponding 1.png|300px|thumb|center|This inlet control has worked well, but the sediment should be removed as soon as possible. (Photo source: CISEC)]]<br>
[[File:ESC ponding 1.png|525px|thumb|center|This inlet control has worked well, but the sediment should be removed as soon as possible. (Photo source: CISEC)]]<br>
==Mobilization, access, staging, and perimeter controls==
==Mobilization, access, staging, and perimeter controls==