Honeywell will begin an air monitoring program at Swann Park the week of May 5th. The monitoring system, which will remain in place throughout the remediation, measures dust levels at the perimeter. It uses monitors spaced around the park’s perimeter to provide coverage in all wind directions.
The U. S Environmental Protection Agency and the Maryland Department of the Environment (MDE) require dust to be monitored because it can be measured continuously and the results can be related to arsenic concentrations. Dust monitoring provides on-the-spot verification that dust control techniques are effective.
In addition to the fixed dust monitoring system, there is also a mobile monitoring program. This monitoring is primarily for protection of on-site workers but it provides additional assurances that the overall dust control program is working. The mobile system uses two dust monitors that are positioned directly downwind from the area being excavated that day.
The dust control measures are designed to keep the concentration below action levels approved by MDE. The perimeter action level is 455 micrograms per cubic meter of air.
If dust levels approach that level, the contractor will increase the dust control efforts, such as spraying any open areas with water. If the dust level cannot be maintained below the action level, any activity suspected of generating the dust will be stopped.
In addition to the dust monitoring system, there is also an arsenic monitoring system that measures the potential exposure of on-site workers to airborne arsenic concentrations. These measurements are made with personal air monitors worn by the construction workers. This monitoring will be done during the excavation phase.
The aerial photograph shows the location of the fixed monitors.