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Trigger depth refers to the minimum amount of snow, usually measured in inches, that has to be on the pavement for you to begin plowing operations for that particular contract. Often it is 2" but can be as little as 1". Usually, the greater the liability exposure to the client, the lower the trigger depth is set. Example: Hospital vs. Golf store. The hospital has to have clear traffic lanes for ambulances to arrive and walkways that are safe for the elderly and infirm. The golf store won't be busy during a snow storm.
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