Offpost Operable Unit Endangerment Assessment/Feasibility Study. Revised Draft.Volume 1. Introduction

摘要

An Endangerment Assessment was performed for the Offpost Operable Unit (OU) ofRocky Mountain Arsenal (RMA). The Offpost OU consists of 27 square miles located to the north and northwest of RMA. It is currently characterized by rural agricultural and residential land uses, with some industrial land use. In the future, land use is projected to change to more commercial, industrial, and recreational land use in areas adjacent to RMA, with some areas zoned for residential development. For these reasons, a rural residential scenario (including agriculture), a commercial/industrial scenario, and a recreational scenario were evaluated. An ecological assessment was also performed, due in part to the bald eagle habitat and other sensitive environments in the Offpost OU. The major steps performed in the EA included data evaluation, identification of chemicals of potential concern, exposure assessment, toxicity assessment, human risk characterization, and ecological assessment.