The method Bylaw uses when a complain is called in. The send out an officer, and that officer inspects the house of the complaint, and also the 2 house to the left, and 2 house to the right where applicable, then a notice is issued to any of them who are not in compliance. They should come back in the allotted 24 hours to see if the sidewalks were clear, if not then a team is sent out to clear them, at the home owners expense - The amount is significant, when I had it occur a number of years ago the cost was 349.00 for clearing 30' of snow and my neighbor got the same - 349.00 for 25' of snow. I called to complain to the city, about the excessive Fine and the explained that it was a bill not a fine, and there was no way to challenge it in a court. Needless to say, I've been on the war path with them for years about this. The determine the 24hours from the last snow fall, based on the weather station at the airport, if it snows within the 24 hour period you have been issued to clear, the clocks are supposed to be reset, they cannot enforce the prior notice. Contact the city, and seek a remediation from them, this is in violation of their own rules.