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Section 2 - Site Description and Background
CSSA is a subinstallation of the U.S. Army Red River Army Depot and is located approximately 10 miles south of Boerne and 19 miles northwest of downtown San Antonio in Bexar County, Texas. The primary mission of CSSA is maintenance, storage, and issuance of ordnance materiels. After detection of HVO contaminants in 1991, CSSA began a voluntary effort to locate the source of groundwater contamination and monitor the extent of known contamination. The CSSA groundwater monitoring program is tasked under Armstrong Laboratory/OEB (AL/OEB) contract F33615-89-D-4003, order 67, mod 2, with Parsons Engineering Science, Inc. (Parsons ES) of Austin, Texas.
CSSA's water is supplied entirely from Army water wells located at CSSA and Camp Bullis. Nineteen water wells have been completed at CSSA (Figure 1) of which only four are active and supply water to the base (wells 1, 9, 10, and 11). three wells in the north pasture are leased to the U.S. Department of Agriculture-Agricultural Research Center for livestock use (wells G, H, and I) and the remaining wells are inactive. Wells 5, 6, A, B, C, E, and F were abandoned in September 1994. Well 1 is the only CSSA well on Camp Bullis property. A brief summary of well histories and uses is provided in Table 1.
In September 1994, wells 2, 3, 4, 16, and D were upgraded for monitoring of the middle Trinity aquifer. In these wells, surface casing was installed to depths ranging from 195 to 205 feet below ground level. Surface completions were upgraded and field measured elevations taken at the sites. These upgrades will aid in determining appropriate water levels in the middle Trinity aquifer and also assist in protecting the wells from possible surface environmental impacts.
Seven potential source areas (previous burn areas and an oxidation pond) were proposed for further investigation by the preliminary evaluation. These areas are shown on Figure 1. Investigation of potential source areas has not been completed as of the date of this report. Thus, a source of HVO contamination is not known at this time. A more detailed description of the CSSA site, encompassing site history, project background, geology, and hydrogeology, may be found in the "Hydrogeologic Report for Evaluation of Groundwater Contamination."