Hydrogeophysical Surveys Of The Trinity And Edwards Aquifers At Camp Bullis, Northern Bexar County, Texas, 2006

Abstract

In 2002, the U.S. Geological Survey (USGS), in cooperation with the U.S. Army, began hydrogeologic studies of Camp Bullis in northern Bexar County, Texas, with mapping of hydrogeologic features and hydrostratigraphic units (Clark, 2003) at a scale of 1:24,000. In 2003, a USGS-contracted helicopter electromagnetic (HEM) resistivity and magnetic survey was flown over Camp Bullis and the adjacent Camp Stanley (Figure 1). This paper describes the integrated ground electrical and electromagnetic geophysical surveys that were conducted in 2006 in order to follow up on the previous studies and to map hydrogeologic features in more detail. The goal of the project is to better understand the hydrogeologic framework and structure of the Trinity and Edwards aquifers within the study area. The Edwards aquifer is classified as a sole-source water supply for the city of San Antonio.