Please read this document first before viewing the contents of appendix 1. Overview ---------------------------------- This appendix contains geophysics information from U.S. Geological Survey (USGS) Scientific Investigations Report 2008-5181, titled "An Integrated Hydrogeologic and Geophysical Investigation to Characterize the Hydrostratigraphy of the Edwards Aquifer in an Area of Northeastern Bexar County, Texas," by Sachin D. Shah, Bruce D. Smith, Allan K. Clark, and Jason D. Payne. The data herein are in the format of the different geophysical data outputs from four geophysical methods. Data are presented in raw and processed formats. Some features are designed to hold specific data types and formats, whereas others allow general or nonstandard data. Geophysics information ---------------------------------- The overall organization is as follows: Time-Domain Electromagnetic Soundings (TDEM): Protem Raw–Includes all .red files generated from the Protem 47 and 57. A .red file consists of multiple soundings containing information for each duty cycle collected by the Protem 47 and 57. Processed–Includes all .mdl or model files (ASCII format) of the TDEM layered-earth models. Also included for each sounding is the .usf file that can be imported into IX1D as raw data. TerraTEM Raw–Includes all .bin files downloaded directly from the terraTEM data collection unit. Three .bin files that represent the high and intermediate resolution duty cycles, as well as a noise measurement .bin file are created for each sounding. Link to zipped Raw_TerraTEM files. Processed–Includes all .mdl files (ASCII format) of the TDEM layered-earth models. Also included for each sounding is the .usf file that can be imported into multiple inversion programs including IX1D. Capacitively Coupled Resistivity (CC_resistivity): Raw–Includes all .bin files downloaded directly from the OhmMapper TR5 obtained during data collection, as well as .stn files converted from .bin files. These files can be imported into a filtering program. Processed–Includes .dat files exported from the AGI EarthImager 2-D inversion software after the inversion process. These files include all final inversion data for each line collected at the site. Direct-Current Resistivity (DC_Resistivity): Raw–Includes all .csv and .bin files for each line for both the dipole-dipole and hybrid Wenner-Schlumberger arrays output from the IRIS Instruments Syscal Pro system. Line 1 is split into two parts: the north (N) and south (S) sides of the line. Line 2 is split into the east and west sides of the 2D-DC resistivity line. Processed–Includes all .dat and .inv files for both the dipole-dipole and hybrid Wenner- Schlumberger arrays. The .dat files are inversion results exported from the AGI EarthImager 2-D inversion software and .inv files are exported from RES2DINV. Frequency-Domain Electromagnetics (FDEM): Raw–Includes two separate .csv files: one for the data collected along a profile and one for global positioning system (GPS) coordinates for each day an FDEM profile was collected. These files contain in-phase and quadrature data at each frequency. Processed–Includes all .gem files (binary format) directly downloaded from the GEM-2 and .gbf database files that can be opened in Oasis montaj. The .gem files are converted to .csv files and then subsequently imported into Oasis montaj for analysis. The .gbf files were created using the Oasis montaj Helicopter Electromagnetic (HEM) module which was used to filter data and calculate apparent resistivity of the quadrature data at each frequency for every GEM-2 profile line. Conversions ---------------------------------- SI to Inch/Pound Multiply By To obtain Length meter (m) 3.281 foot (ft) kilometer (km) 0.6214 mile (mi) Area square kilometer (km2) 0.3861 square mile (mi2) Vertical coordinate information is referenced to North American Vertical Datum of 1988 (NAVD 88). Horizontal coordinate information is referenced to North American Datum of 1983 (NAD 83). Altitude, as used in this report, refers to distance above the vertical datum. Acronyms ---------------------------------- TDEM - Time-domain electromagnetic FDEM - Frequency-domain electromagnetic CC - Capacitively coupled resistivity 2D-DC- Two-dimensional direct-current resistivity USGS - U.S. Geological Survey Disclaimer Information ---------------------------------- This report was prepared by an agency of the U.S. Government. Neither the U.S. Government nor any agency thereof, nor any of their employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the U.S. Government or any agency thereof. Although all data and software in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS, as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and the USGS in the use of these data, software, or related materials assumes no responsibility. For additional information, contact: Director USGS Texas Water Science Center 8027 Exchange Drive Austin, Texas 78754-4733 E-mail: dc_tx@usgs.gov