Geophysical and Geohydrologic Investigation of Anniston Army Depot, anniston, Alabama

摘要

Surface remote sensing techniques along with geohydrologic investigations were employed at Anniston Army Depot, Calhoun County, Alabama to evaluate the potential of groundwater contamination and its subsequent migration and movement into and within the bedrock. These techniques were successfully used to delineate the horizontal and vertical boundaries of seven buried chemical sludge trenches. In addition conductive plumes, as determined by electromagnetic and resistivity techniques, were delineated at several locations throughout the area of investigation. Groundwater flow directions were established and were found to be highly dependent upon the local topography. The regional groundwater flow is in a south to southeast direction. In general, the regional bedrock throughout the study area is a planar surface dipping gently to the south-southeast with the depth to bedrock varying locally from 20 to 100 feet. Based upon the thickness of overburden and soil permeabilities the probability exists that a contaminant from AAD activities has reached the bedrock surface. A sinkhole in the northern part of the study area appears to fall on a lineation formed by sinkhole features relating to a possible fracture. Evidence of possible fracturing or faulting associated with the Jacksonville fault was identified in the southeast part of the study area. (Author)