Changes

|Bottom/sump||The bottom 100 mm of the well should be capped and free of perforations to provide a small reservoir of water to keep the sensor wet during dry weather.   

|Bottom/sump||The bottom 100 mm of the well should be capped and free of perforations to provide a small reservoir of water to keep the sensor wet during dry weather.   

|-

|-

|Length||The well should extend into the native soil below the facility by a minimum 150 mm.  Top should be above the surface overflow elevation or above the maximum ponding depth to prevent surface water from entering the well.  If the perforated drainage pipe is installed in a v-notch below the bottom of the facility, the well should extend 150 mm below the invert of this drainage pipe.

|Length||Shallow wells should extend into the filter media by a minimum of 150 mm. Deep wells should extend into the native soil below the facility by a minimum 150 mm.  Tops should be above the surface overflow elevation or maximum ponding depth to prevent surface water from entering the well.  If the underdrain perforated pipe is installed in a shallow trench below the bottom of the facility, the well should extend 150 mm below the invert of the perforated pipe.

|-

|-

|Cap||The well should be finished with a lockable cap to prevent vandalism.

|Cap||The well should be finished with a lockable cap or standard monitoring well casing an monument to protect, secure and provide access to it.

|}

|}