Nevada Division of Water Resources Toby L. Welborn 2009 vector digital data U.S. Geological Survey Scientific Investigations Map SIM2009-3063 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sim3063_Tahoe_NDWR_Wells Nevada Division of Water Resources 200780129 tabular digital data Carson City, NV Nevada Division of Water Resources http://water.nv.gov/Engineering/wlog/wlog.cfm These data present a ground-water inventory of existing geospatial data and other information needed to determine the extent and characteristics of the aquifers in the Tahoe Basin. Geospatial and other data include well information from various local, state, and federal agencies; geophysical surveys; and results of available ground-water and geological studies. The compilation and development of a ground-water inventory geospatial database will assist the United States Forest Service in better assessing the present and future impacts on ground-water resources within the Lake Tahoe Basin. These data were developed in support of the Lake Tahoe ground-water inventory. The intended uses of this data set include, but are not limited to, natural resource modeling, mapping, and visualization applications. This data set is current as of January 29, 2008 20080129 data of download Complete None planned -119.955938 -119.898539 39.240548 38.969547 ISO 19115 Topic Geoscientific Information Environment Inland waters None Ground water None Lake Tahoe Nevada California None Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the data set in nonproprietary form, as well as ArcGIS format, this metadata file may include some ArcGIS-specific terminology. These data are not intended to be used as a survey product and are for reference purposes only. U.S. Geological Survey Nevada Water Science Center Public Information Officer mailing and physical address

2730 N. Deer Run Road

Carson City NV 89701 USA (775)887-7600 (775)887-7629 http://pubs.usgs.gov/sim/3063/sim3063.pdf Map of the Hydrogeology of the Lake Tahoe Basin, California and Nevada pdf Acknowledgment of the U.S. Geological Survey and the U.S.Forest Service would be appreciated in products derived from these data. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.0.1770 Verification was done by interactive on-screen review. Frequency tests were performed on all feature class attributes to check that no features were unlabeled, misspelled, or inconsistent. Corrections were made until one visual comparison, combined with on-screen review, determined 100 percent of the digital attribute data was correct. Polygon and chain-node topolgy present. Complete for Lake Tahoe study area. Errors resulting from source data quality, automation processes, and scale resolution can impact the accuracy of data. These data are derived from 1:100,000-scale sources. National Map Accuracy Standards (NMAS) established for the United States in 1947 (U.S. Geological Survey, 1988) state that no more than 10 percent of features shall be more than 1/50th of an inch from their intended location on maps of scale smaller than 1:20,000. National Standards for Spatial Data Accuracy (NSSDA) published by the Federal Geographic Data Committee (FGDC) in 1998 relate the NMAS to the digital geospatial data standard by multiplying the NMAS accuracy by a factor of 1.1406 resulting in expected error in the geospatial data at standard mapping scales as follows: 1: 24,000-scale map - 14 meters 1: 62,500-scale map - 36 meters 1: 100,000-scale map - 58 meters 1: 250,000-scale map - 145 meters 1: 500,000-scale map - 290 meters 1:1,000,000-scale map - 579 meters References Cited FGDC, Subcommittee for Base Cartographic data, 1998, Geospatial Positioning Accuracy Standards, Part 3: National Standard for Spatial Data Accuracy, FGDC-STD-007.3-1998, last accessed 03/29/2007 at URL http://www.fgdc.gov/standards/projects/FGDC-standards-projects/accuracy/part3/chapter3 U.S. Geological Survey, 1988, National mapping program technical instructions - Part 2: Specifications, Standards for Digital Line Graphs: U.S. Geological Survey, 56 p. 58 meters Well locations have been located to the centroid of the nearest township, range, section by the Nevada Division of Water Resources. The original location data reported by the NDWR was not altered during processing. Attribute accuracy has not been assessed. Nevada Division of Water Resources 20080129 tabular digital data Carson City, NV Nevada Division of Water Resources http://water.nv.gov/Engineering/wlog/wlog.cfm online 20080129 publication date NDWR wells Well location, well depth, well casing, pumptest, and lithologic information Water well drillers reports and drill logs were transcribed to Excel spreadsheets. Wells were plotted by the Northing and Easting in ArcMap and exported to a point feature class. Logs 2008 Tahoe_NDWR_Well NV_Logs Well information parsed into state_csng, state_lithology, state_pumptest, state_screeninterval, and state_well table. Tables were related to Tahoe_NDWR_Well data by landkey_sectn. This creates a one to many relationship between the Tahoe_State_Well_Generalized polygons with the state_well table. All other tables are related through the state_well table. Tahoe_NDWR_Well 2008 Tahoe_NDWR_Well state_csng state_lithology state_pumptest state_well state_screeninterval Vector Entity point 20 Universal Transverse Mercator 10 0.999600 -123.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000100 0.000100 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 None 0.000100 None Explicit elevation coordinate included with horizontal coordinates Tahoe_NDWR_Well NDWR well locations Nevada Division of Water Resources OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. Twn Township BLM Land Information System Text Rng Range BLM Land Information System Text Sec Section BLM Land Information System Text Sec_Quarter Section Quarter BLM Land Information System Text lndkey_sectn Concatenation of lndkey and sectn columns, used to relate well data with Tahoe_State_Well_Generalized polygons. U.S. Geological Survey Text log_no Well log number Nevada Division of Water Resources Text Aquifer_Cd Aquifer code U.S. Geological Survey 001 Incline Village U.S. Geological Survey 002 Tahoe City/West Shore Aquifer(s) U.S. Geological Survey 003 South Lake Tahoe/Stateline Aquifer U.S. Geological Survey 005 Kings Beach/Tahoe Vista Aquifer U.S. Geological Survey 007 East Shore Aquifer U.S. Geological Survey Minor_Aq_Cd Minor aquifer code. U.S. Geological Survey 007A Sand Harbor U.S. Geological Survey 007B Glenbrook U.S. Geological Survey 007C Zephyr Cove U.S. Geological Survey rel_ndwr_state_well Relationship class ESRI state_csng Table - casing information U.S. Geological Survey state_lithology Table - lithology information U.S. Geological Survey state_pumptest Table - pumptest information U.S. Geological Survey state_well Table - master well table U.S. Geological Survey state_screeninterval Table - screen interval information U.S. Geological Survey U.S. Geological Survey Ask USGS ? Water Webserver Team Address of the ESIC mailing

507 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sim3063_Tahoe_NDWR_Wells Downloadable Data Although these data have been used by the U.S. Geological Survey, U.S. Department of the 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 these data, software, or related materials. File Geodatabase 9.2 File Geodatabase Spatial and attribute information WinZip 40.7 mb http://water.usgs.gov/GIS/dsdl/SIM3063.zip File Shape 9.2 File Shape Spatial and attribute information WinZip 34.890 mb http://water.usgs.gov/GIS/dsdl/SIM3063_Shapefile.zip XML Workspace Document 2008 Spatial and attribute information WinZip 35.5 mb http://water.usgs.gov/GIS/dsdl/SIM3063_XML.zip This dataset is provided by the USGS as a public service. 20081222 20090326 20081019 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

507 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sim3063_Tahoe_NDWR_Wells FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998