Environmental Assessment for the Construction of Flood Control Structures in Base Housing, Eielson Air Force Base, Alaska.

摘要

Introduction. Eielson Air Force Base (Eielson) is proposing to construct flood control structures that are designed to protect 62 housing units in the Moose Lake Estates subdivision area of base housing from flooding during summer months. Currently, houses in the Moose Lake Estates are protected by a 9-foot high levee that was built to prevent surface flooding of the area. Although surface flooding has not been a source of flooding to these houses, infiltration into basements during high groundwater periods in summer has caused significant damage and inconvenience to base housing residents. This project is intended to alleviate this problem. Description of the Proposed Action. The proposed action will result in the construction of a 2,064-foot interceptor trench connected to a 50-foot by 75-foot basin from which groundwater would be pumped. The trench will contain a 30-inch diameter perforated pipe, which will be placed on a descending gradient, with the greatest depth at the basin end of the trench system. High volume pumps will be installed near the collection basin to pump water from the basin to a location down gradient from the housing area. The proposed project will result in the loss of 1.32 acres of wetlands. Alternatives to the Proposed Action. One alternative to the proposed action was identified.