Revision History for FS 2012–3019 Darwin J. Ockerman, Travis J. Garcia, and Stephen P. Opsahl Science To Support the Understanding of South Texas Surface-Water and Groundwater Resources in a Changing Landscape ----------------------------------------------------- Posted online March 15, 2012 ----------------------------------------------------- Revised and reposted April 13, 2012 p. 4 section "Sediment Monitoring in the Lower San Antonio and Guadalupe Rivers" First sentence "The USGS—in cooperation with the San Antonio River Authority…" was changed to "The USGS—in cooperation with the San Antonio River Authority and the Texas Water Development Board…" p. 5 section "Assessing the San Antonio River Watershed for Possible Contaminants from Hydraulic Fracturing Fluid and Water Produced by Oil and Gas Activities" First sentence "The recent increase in hydraulic fracturing of gas and oil plays has contributed to a surge in oil and gas production in south Texas, with much of the development occurring in south Texas." was changed to "The recent increase in hydraulic fracturing of gas and oil plays has contributed to a surge in oil and gas development, and in Texas there has been rapid development in the San Antonio River watershed."