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When a barge with dredged material is located at the Confined Disposal Facility (CDF), the air is monitored near the dock using a photoionization detector (PID). This PID monitoring takes place daily prior-to and during dredging. Conducting PID monitoring at the dock area provides data on the effects of sediment activity at the barge on emission levels for worker and community safety.
Air monitoring is conducted at a single location near the dock area using a PID for a 30-minute continuous period. This monitoring takes place once per day when a barge with dredged material is docked at the site and for 10-days prior to dredging. The PID records 30 minute averages. If those averages exceed 10 ppm, an action level is triggered and the appropriate action is taken as described below. If the level exceeds 10 ppm for five consecutive days, the contractor will implement emission control measures. If the level exceeds 100 ppm at any time, the contractor will implement emission control measures immediately.