Technical Reports Document Library

… The purpose of this study is to assess the potential for salinewater intrusion into the freshwater zone. The purpose of this report is to present hydrogeologic data collected during the test drilling and initial testing phase of the study. Information regarding flow tests, water quality, geophysical logs, and lithology are provided in this report. The study was conducted by the U.S. Geological Survey in cooperation with the San Antonio City Water Board, the Edwards Underground Water District, and the Texas Water Development Board….

Water samples were collected during each cumulative-depth flow test and interval flow test. Water-quality data collected include the field determination of pH, temperature, alkalinity, and specific conductance. Laboratory analyses include determination of inorganic concentrations of the major cations and anions. Results of laboratory analysis for the cumulative-depth flow tests and interval flow tests for wells A-1, C-1, and D-1, and from all seven completed monitor wells taken in March and July 1986, are listed in tables by well in the “Hydrogeologic Data” section of this report.

With the completion of drilling, testing, and monitor-well construction, a long-term (50 years) monitoring program is now in effect. Continuous water-level recorders have been installed on each well to establish a record of water-level fluctuations. Water-quality samples are being collected monthly for chemical analysis to establish a record of any variations in water quality.