Sediment remediation is like a construction project on the water. It can feel inconvenient, but a bit of patience results in a big payoff. Because the majority of work will be conducted in the lower wetlands area, it will not be visible from Holton Road or Wood Street. When remediation begins, a staging area will be set up in the upland portion of the property where sediment will dry out before it is trucked off site. This area may be visible from Holton Road.
Wood Street will remain closed to thru traffic south of Twigs Lane while the project in underway. This is intended to prevent traffic conflicts between the public and trucks hauling sediment from the wetlands. The closure will be marked with signage along Wood Street.
Construction Noise & Truck Traffic
Construction equipment may cause some noise disruption to the neighborhood near the Zephyr site. Trucks, cranes, and excavators will be used during remediation. Daily work schedules have not yet been determined, but we anticipate 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 will be 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 will be closed for safety reasons. Sediment will then be 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. Approximately 5-7 trucks per hour (40-50 trucks per day) are expected on local roads when cleanup activities begin.
Odors & Air Monitoring
The cleanup process will almost certainly 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 will be installed at the site to ensure air quality standards are maintained. A hotline may be established for nearby residents and businesses to notify the project team of sediment odor issues beyond what can be expected. Details for reporting odor issues will be posted here when they are available. Further preventive actions, such as odor-suppressing foam and covering sediment piles, will be taken if warranted.
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 the creation of dust during sediment processing activities.
Whereas air quality measure will be captured continuously, dust measurements will be taken every 24-hours using a canister grab (pictured). Canisters will be analyzed for particulate concentrations and must meet State and Federal standards.