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Scope/Content: Abstract: The Curtis Pond Dam is a concrete and stone masonry structure located in the Town of Middleton and owned by the Town of Danvers. This dam was found to be in an unsafe condition according to Massachusetts Dam Safety Regulations. The Town of Danvers initiated this study to determine the feasibility of removing the dam to address its Unsafe condition. The Town was awarded a 50% grant from the Gulf of Maine Council - National Oceanic and Atmospheric Administration Habitat Restoration program to complete this feasibility study. Extensive evaluation of the site was completed as part of this study. The work included a characterization of the physical condition and characteristics of the dam structure, wetland delineation, determination of baseline ecological conditions, bathymetric survey, and subsurface conditions. A sediment analysis was completed to develop a strategy to address the potential mobilization of soft sediment from Curtis Pond. The analysis began with a desktop due diligence investigation of potential upstream contamination that found existing sites had been treated to a level of no significant risk. The analysis then used sediment sampling to determine physical and chemical characteristics of the sediment. Chemical sampling found the upstream sediment does not represent a significant exposure risk to humans in the event it becomes exposed after dam removal. The finding of this evaluation was in-stream management would be the preferred alternative for this site. A hydrologic and hydraulic analysis was completed using a HEC-2 model to evaluate the impact of modifications to the dam. Modeling of three scenarios for five separate storm events found only minor impacts to the impoundment storm elevations upstream of Curtis Pond and routed stream elevations downstream of Curtis Pond Dam. A habitat evaluation was conducted for Boston Brook and Curtis Pond. This evaluation finds restoration of Boston Brook to natural flow conditions is desirable. Various fish and bird species can be expected to benefit from dam removal. Furthermore, rare species would not be negatively impacted by dam removal. Four alternatives were evaluated to address the dam condition at the site, (1) no action, (2) dam repair, (3) partial dam removal, and (4) complete dam removal. Complete dam removal is recommended as the most feasible, cost-effective approach that meets regulatory requirements. Conceptual plans for the dam removal and profile were developed. The anticipated extent of permitting required for the site was estimated. Actual requirements will be dependent on the ultimate project scope and permitting authorities' response to the proposed project. Eight (8) separate permits are projected to be required for this project. An opinion of probable cost was developed for the construction phase of this project for planning purposes. The total estimated construction phase cost is $332,000. Scope/Content: Dam type: concrete Scope/Content: Dam type: stone Scope/Content: Date constructed: 1933.
Alternative analysis (e.g., feasibility studies, EIRs) Dams Dam retirement