Similar to the ballast/shoulder zone, this track area must be Yard Track Zones: practically free of vegetation. Mechanical methods are not effective. Buildings/Communications and Signal Facilities: These areas have a low tolerance for vegetation to reduce tripping hazards in the workplace. Table 1 summarizes the treatment thresholds used in this IVMP that will trigger a treatment decision: 1: Treatment Thresholds Zone Location Treatment Threshold Primary Control Action 1% weed cover Main track N/A for Chemical preemergent 1% weed Ballast/Shoulder Siding N/A for Chemical preemergent 5% weed cover Storage track N/A for chemical preemergent 20% cover by area or General height above 3’ or Mechanical & chemical sight lines Signalized crossing lines Mechanical & chemical Non-signalized Sight lines Mechanical & chemical crossing Inner Pedestrian crossing Sight lines Mechanical & chemical curve Line of sight Mechanical & chemical
Yard Track Zones: Similar to the ballast/shoulder zone, this track area must be practically free of vegetation. Mechanical methods are not effective. Buildings/Communications and Signal Facilities: These areas have a low tolerance for vegetation to reduce tripping hazards in the workplace. Table 1 summarizes the treatment thresholds used in this IVMP that will trigger a treatment decision: 1: Treatment Thresholds Zone Location Treatment Threshold Primary Control Action Ballast/Shoulder Main track 1% weed cover N/A for preemergent Chemical Siding 1% weed N/A for preemergent Chemical Storage track 5% weed cover N/A for preemergent chemical Inner General 20% cover by area or height above 3’ or sight lines Mechanical & chemical Signalized crossing lines Mechanical & chemical Non-signalized crossing Sight lines Mechanical & chemical Pedestrian crossing Sight lines Mechanical & chemical curve Line of sight Mechanical & chemical
akrr-ipm-2018.docx