Should the property owner and/or contractor fail to maintain the project in a safe and orderly condition, the Borough may, on two days' written notice, or immediately in the case of hazard to life, health, or property, undertake whether work may be necessary to return the project to a safe and orderly condition. The cost thereof shall be charged against the performance guaranty, or if none has been posted, or if the guaranty is insufficient to cover the costs, the costs shall constitute a lien against the property.