Janet Carter 2009 vector digital data http://water.usgs.gov/lookup/getspatial?sim2993_obs_wells Janet M. Carter and Allen J. Heakin 2008 map Scientific Investigations Map 2993 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sim/2993/ This data set describes observation wells completed in the Arikaree aquifer that were used to create a map of the generalized potentiometric surface of the Arikaree aquifer in the Pine Ridge Indian Reservation and Bennett County. The observation wells are owned by the South Dakota Department of Environment and Natural Resources. Water levels in the wells were measured by staff of the South Dakota Department of Environment and Natural Resources. The water-level data for this data set are based on the average of measured values for the well from completion through 2005. The range in water-level data for this data set was from 1977 to 2005. All water levels were retrieved from the U.S. Geological Survey's NWISWeb database at http://nwis.waterdata.usgs.gov/sd/nwis/gwlevels. This data set was created as part of a project to map the potentiometric surface of the Arikaree aquifer in the Pine Ridge Indian Reservation and Bennett County. In 1998, the U.S. Geological Survey began working in cooperation with the Oglala Sioux Tribe to develop a potentiometric map of the Arikaree aquifer in Jackson and Shannon counties. In 2003, the study area was expanded to include Bennett County. This data set was subjected to the same review standard that applies to all U.S. Geological Survey publications. Reviewers were asked to check the topological consistency, tolerances, attribute frequencies and statistics, projection, and geographic extent. The reviewers checked the metadata files for completeness and accuracy. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ARC/INFO format, this metadata file may include some ESRI ArcInfo Coverage specific terminology. 1977 2005 ground condition Complete None planned -102.522106 -101.199045 43.527445 42.972225 None Arikaree aquifer potentiometric surface hydraulic head water level wells ground water inlandWaters None Pine Ridge Indian Reservation Bennett County Shannon County Jackson County South Dakota None. Arikaree Formation None. Tertiary None. These data should not be used at scales larger than 1:125,000. Janet Carter U.S. Geological Survey Hydrologist mailing and physical address

1608 Mt. View Road

Rapid City SD 57702 USA 605 394-3215 605 355-4523 jmcarter@usgs.gov Compilation of this coverage and associated metadata was performed in cooperation with the Oglala Sioux Tribe. Public Unclassified None Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850 Multiple visual checks were done to verify that the attribute data were coincident with the original source map (SIM 2993). Point features present. This data set consists of observation well locations for the Arikaree aquifer in the Pine Ridge Indian Reservation and Bennett County. Many of the sites were visited, and a hand-held global positioning system was used to determine the latitude and longitude of the well to within one second. If needed, the latitude and longitude were updated in the USGS Ground-Water Site Inventory database. Points were plotted on mylar and checked for accuracy based on the township/range/section of the site. U.S. Geological Survey 2007 tabular digital data http://waterdata.usgs.gov/sd/nwis/gw Janet M. Carter and Allen J. Heakin 2008 map Scientific Investigations Map 2993 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sim/2993/ online 1977 2005 ground condition GWSI Ground-Water Site Inventory database This product is the digital version of the observation wells depicted on sheet 1 of Scientific Investigations Map 2993. STEP 1: Data were retrieved from the USGS Ground-Water Site Inventory database and pulled into a spreadsheet for calculation of some attribute data. STEP 2: An ARC/INFO coverage was created using the "createpoint" command. STEP 3: Hydraulic head was calculated by subtracting the water level from the land surface altitude of the well. The average water level and hydraulic head for each well was determined by averaging all values from the well. The ancillary data for the observation wells were published online in March 2008 as supplementary data (Excel spreadsheet) for Scientific Investigations Map 2993 at http://pubs.usgs.gov/sim/2993/. 20090210 Janet Carter U.S. Geological Survey Hydrologist mailing and physical address

1608 Mt. View Road

Rapid City SD 57702 USA 605 394-3214 605 355-4523 jmcarter@usgs.gov Vector Entity point 54 Point 4 Universal Transverse Mercator 13 0.999600 -105.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000128 0.000128 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 obs_wells Observation wells completed in the Arikaree aquifer in the Pine Ridge Reservation and Bennett County USGS FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. AREA Area of feature in internal units squared. ESRI Area is always zero for point coverages. Values are automatically generated. PERIMETER Perimeter of feature in internal units. ESRI Perimeter is always zero for point coverages. Values are automatically generated. STATIONID This is a unique number given to each well. STATIONID is a combination of the latitude and longitude of the well, plus a sequence number for wells located at the same latitude and longitude. (NOTE: The latitudes or longitudes orginally assigned to sites in the USGS's Ground-Water Site Inventory (GWSI) occasionally are determined to be incorrect. In these cases, the latitude or longitude is corrected, but the station identification number remains undchanged. Thus, the latitude or longitude for a site may not correspond exactly with the STATIONID. Ground-Water Site Inventory (GWSI) database Unique whole numbers that are based on latitude and longitude LOCAL The LOCAL number is based on the Federal land-survey system for western South Dakota. LOCAL consists of the township number followed by "N" (north of the Black Hills Meridian), the range number followed by "W" (west of the Black Hills Meridian), and the section number, followed by a maximum of four uppercase letters that indicate, respectively, the 160-, 40-, 10-, and 2.5-acre tract in which the site is located. These letters are assigned in a counterclockwise direction beginning with the letter "A" for the northeast quarter. A serial number following the last letter is used to distinguish between wells located in the same 2.5-acre tract. Ground-Water Site Inventory (GWSI) database Unique numbers and characters that are based on township, range, section LATITUDE The latitude of the well in degrees, minutes, seconds (NAD 27). Ground-Water Site Inventory (GWSI) database 425956 433056 degrees, minutes, seconds (NAD 27) LONGITUDE The longitude of the well in degrees, minutes, seconds (NAD 27) Ground-Water Site Inventory (GWSI) database 1011345 1023118 degrees, minutes, seconds (NAD 27) COUNTY County that the well is located in: Bennett, Jackson, or Shannon County USGS Shannon Shannon County USGS Bennett Bennett County USGS Jackson Jackson County USGS LANDALT Land-surface altitude at the well site. Altitude was determined by plotting the well location on 1:24,000- or 1:25,000-scale maps and interpolating the altitude from the map. All LANDALT values are converted to NAVD 88. Ground-Water Site Inventory (GWSI) database 2612 3493 feet above NAVD 88 WLEVELNO Number of water levels available through 2005 for this well. USGS 1 208 none 1977 2005 WLEVELAVG Average water level (in feet below or above (-) land surface). This value was calculated by averaging all available water-level measurements for the well. USGS -10 191 feet 1977 2005 HEADAVG This value is the average hydraulic head at the well. Hydraulic heads for each well were calculated by subtracting the water level from the land-surface altitude, then taking the average for each well. All HEADAVG values are in feet above NAVD 88) USGS 2584 3463 feet above NAVD 88 1977 2005 HOLEDEPTH Total depth to which the hole was drilled, in feet below the land surface. Values of 99999 indicate that this information was missing. Ground-Water Site Inventory (GWSI) database 99999 Missing value USGS WELLDEPTH Depth of the finished well, in feet below land surface. The depth of the well is the greatest depth to which the well can be sounded. Ground-Water Site Inventory (GWSI) database 27 835 feet above NAVD 88 WLCATEGORY This is the category of water-level depth assigned to the well. The numerical values assigned to each well correspond to the depth categories used on sheet 1 of Scientific Investigations Map 2993. Sheet 1, Scientific Investigations Map 2993 1 Average water level depth of less than 50 feet. Sheet 1, Scientific Investigations Map 2993 2 Average water level depth of 50 to less than 100 feet. Sheet 1, Scientific Investigations Map 2993 3 Average water level depth of 100 to less than 150 feet. Sheet 1, Scientific Investigations Map 2993 4 Average water level depth of 150 feet or greater. Sheet 1, Scientific Investigations Map 2993 U.S. Geological Survey Ask USGS - Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sim2993_obs_wells Downloadable Data Although this data set has been used by the U.S. Geological Survey, U.S. Department of Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. shape file winzip 0.002 http://water.usgs.gov/GIS/dsdl/sim2993_obs_wells.zip None 20090813 U.S. Geological Survey Ask USGS - Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time None Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the data set in nonproprietary form, as well as Environmental Systems Research, Inc. (ESRI) ArcGIS format, this metadata file may include some ArcGIS-specific terminology. Acknowledgment of the U.S. Geological Survey and the Oglala Sioux Tribe would be appreciated in products derived from these data. Public Unclassified None http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile