Changes

[[File:monitoring-well-subgrade.jpg|400px|thumb|right|Monitoring well stack installed next to underdrain within the LID practice.]]

[[File:monitoring-well-subgrade.jpg|400px|thumb|right|Monitoring well stack installed next to underdrain within the LID practice.]]

====Monitoring Wells====

====Monitoring Wells====

[[Monitoring wells]] allow for measurement of water levels in the sub-surface components of LID practices. They are important for sampling procedures and ensuring that the LID feature are performing as intended.<br>

[[Monitoring wells]] allow for measurement of water levels in the sub-surface components of LID practices. They are important for sampling procedures and ensuring that the LID feature are performing as intended.

'''Construction Steps:'''<br>

'''Construction Steps:'''

#Install a cap stand at the required elevation to anchor the monitoring well.

#Install a cap stand at the required elevation to anchor the monitoring well.

#Wrap the perforated pipe with a geotextile sock (to prevent migration of soil into the well).

#Wrap the perforated pipe with a geotextile sock (to prevent migration of soil into the well).

#Anchor the perforated pipe to the bottom of the LID feature.

#Anchor the perforated pipe to the bottom of the LID feature.

#Install a lockable cap to the top of the standpipe to protect against vandalism.

#Install a lockable cap to the top of the standpipe to protect against vandalism.

#Install monitoring equipment (e.g., a level logger) if required.<br>

#Install monitoring equipment (e.g., a level logger) if required.

'''Key Inspection Points:'''<br>

'''Key Inspection Points:'''

*Pipe is perforated, rigid, and matches design specifications.

*Pipe is perforated, rigid, and matches design specifications.

*Well is installed according to contract documents.

*Well is installed according to contract documents.

*Geotextile sock is wrapped around the perforated portion of the well.<br>

*Geotextile sock is wrapped around the perforated portion of the well.

'''Mistakes to Avoid:'''<br>

'''Mistakes to Avoid:'''

*Incorrect sequencing – ensure that standpipe is installed prior to backfilling with granular material.<br>

*Incorrect sequencing – ensure that standpipe is installed prior to backfilling with granular material.