Changes

Infiltration practice locations should not be used as sediment basins during construction. To prevent sediment from clogging, erosion and sediment controls should remain in place and runoff should be diverted from the infiltration facility until the contributing drainage area is fully stabilized and sediment removal from catch basins, pre-treatment devices and maintenance hole sumps has been completed.   

Infiltration practice locations should not be used as sediment basins during construction. To prevent sediment from clogging, erosion and sediment controls should remain in place and runoff should be diverted from the infiltration facility until the contributing drainage area is fully stabilized and sediment removal from catch basins, pre-treatment devices and maintenance hole sumps has been completed.   

===Operation and Maintenance===  

==Inspection and Maintenance==  

Infiltration trenches, chambers and soakaways will continue to function during winter months if the overflow outlet is located below the local maximum frost penetration depth (i.e. frost line).  

Infiltration trenches, chambers and soakaways will continue to function during winter months if the overflow outlet is located below the local maximum frost penetration depth (i.e. frost line).  

Routine inspection and maintenance consists of checking and cleaning trash, debris and sediment from pre-treatment devices, inlets and outlets twice a year in the spring and/or late fall, or when pre-treatment device sump is half full. Use hydro-vac truck to remove sediment from catch basin sumps, OGS and isolated chamber row filter pre-treatment devices.  To clean isolated chamber row filters use a vacuum truck equipped with rear-facing jet nozzle for cleaning large diameter pipes or culverts.  

Routine inspection and maintenance consists of checking and cleaning trash, debris and sediment from pre-treatment devices, inlets and outlets twice a year in the spring and/or late fall, or when pretreatment device sump is half full. Use hydro-vac truck to remove sediment from catch basin sumps, OGS and isolated chamber row filter pre-treatment devices.  To clean isolated chamber row filters use a vacuum truck equipped with rear-facing jet nozzle for cleaning large diameter pipes or culverts.  

Monitoring of storage reservoir water level during and after natural or simulated storm events using the monitoring well should be performed periodically to verify the facility drains within the required drainage time (typically 72 hours). Should be performed as part of inspections following construction or major rehabilitation prior to assumption, and every 15 years at a minimum, to track drainage performance over time and determine when replacement is needed.

Monitoring of storage reservoir water level during and after natural or simulated storm events using the monitoring well should be performed periodically to verify the facility drains within the required drainage time (typically 72 hours) and/or following every major storm event (>25 mm). Should be performed as part of inspections following construction or major rehabilitation prior to assumption, and every 15 years at a minimum, to track drainage performance over time and determine when replacement is needed.