Whenever a site plan requires screening and/or landscaping, the applicant shall deposit with the City a cash or corporate surety bond, irrevocable bank letter of credit or any other security deemed acceptable by the City in the full amount of such improvement for the faithful completion of such improvement. When such screening improvement and/or landscaping requires landscaped earth berms or planted or natural vegetation screening, such bond shall continue for two years following the completion and inspection of all planting to ensure that all unhealthy and dead plant material shall be replaced, and the bond shall be released only after there has been a site inspection and a determination made that the screening has been planted as planned. The applicant shall provide a cost estimate on the site plan indicating the full amount of such improvement.