Sediment remediation is like a construction project on the water. It can feel inconvenient, but a bit of patience results in a big payoff. The work conducted in the lower wetlands area is not visible from Holton Road or Wood Street. The staging area is visible in the upland portion of the property. Here, sediment dries out before being trucked off site.
Wood Street will remain closed to thru traffic south of Twigs Lane while the project in underway. This is to prevent traffic conflicts between the public and trucks hauling sediment from the wetlands. The closure is marked with signage.
Construction Noise & Truck Traffic
Construction equipment may cause some noise disruption to the neighborhood. Trucks, cranes, and excavators are used during remediation. Daily work schedules are 10 or 12-hour workdays. If needed, the project team will implement further noise control measures, such as improved mufflers and muted back-up alarms.
Sediment is being trucked from the wetland to the upland area for drying. The truck route includes a brief, southern portion of Wood Street below Twigs Lane. This portion of Wood Street is closed for safety reasons. Sediment is then hauled from the sediment drying pad to an off-site disposal facility using the gate on the north end of the property on Highway 120/Holton Rd. There are approximately 5-7 trucks per hour (40-50 trucks per day) on local roads during cleanup activities.
Odors & Air Monitoring
The cleanup process may expose odor from the petroleum contamination. The odor may be strong, depending on the concentration of the petroleum product and the direction of the wind. However, the human nose is capable of smelling these chemicals at levels far below concentrations that are associated with human health impacts.
Community safety is a priority. A comprehensive system of real-time and continuous air monitors is installed at the site to ensure air quality standards are maintained.
Excavation of sediment in the wetland may also create dust. The project team will measure and control dust levels to prevent downwind exposure to dust using similar techniques demonstrated for protecting air quality. Equipment may also be operated at a slower pace to minimize dust.
Dust measurements are being taken every 24 hours using a canister grab. Canisters are analyzed for particulate concentrations and must meet state and federal standards.