Hydrogeologic Groupings of the Lake Tahoe Basin

Russel W. Plume 2009 Hydrogeologic Groupings of the Lake Tahoe Basin 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_Hydrogeology_Grp Russell W. Plume, Mary L. Tumbusch, and Toby L. Welborn 2008 Hydrogeology of the Lake Tahoe Basin, California and Nevada pdf document Scientific Investigations Map SIM2009-3063 Reston, Virginia U.S. Geological Survey http://pubs.usgs.gov/sim/3063/ 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 geologic maps and soil surveys of the entire basin and for specific watersheds within the basin at the best available scales; vegetation remote-sensing datasets; well information from various local, state, and federal agencies; geophysical surveys; and results of available ground-water 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 to represent hydrogeologic units within the Lake Tahoe basin 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. 2005 publication date Complete None planned -120.279898 -119.842864 39.384372 38.615501 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. Consider adding the following here. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. 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 2; ESRI ArcCatalog 9.2.2.1350 Plume, Russel W., Tumbusch, Mary L., Welborn, Toby L. 2009 Hydrogeology of the Lake Tahoe Basin map Scientific Investigations Map SIM Reston, VA U.S. Geological Survey U.S. Geological Survey 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. Heads up visual checks were done verify polygon boundaries with existing Tahoe_Geology (Saucedo, 2003) data set and to verify no shifts were introduced during processing. 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 These data were derived form 1:100,000 scale source data. The error inherent from the scale is at least 58 meters on the X-Y. Saucedo, G.J. 2005 Geologic map of the Lake Tahoe Basin, California and Nevada, scale 1:100,000 vector digital data Regional Geologic Map Series Map No. 4 San Francisco, CA California Geological Survey 100,000 CD-ROM 2005 publication date Saucedo, 2005 Geology units for hydrogeologic unit groupings and delineation of aquifer extents. United States Army Corp of Engineers 2003 Lake Tahoe Basin framework study ground water evaluation, Lake Tahoe Basin, California and Nevada document Sacramento, CA U.S. Army Corp of Engineers paper 2003 publication date USACE, 2003 Guide for aquifer boundary delineations. Markiewicz, R.D. 1992 Geophysical investigations, Lake Tahoe Basin technical assitance to the states, Nevada and California, electrical resistivity surveys, seismeic reflection surveys document Unknown Bureau of Reclamation paper 1992 publication date Markiewicz, 1992 Description information for Incline Village Aquifer and Tahoe Coty/West Shore Aquifer(s). Woodling, J.K. 1987 A hydrogeologic investigation of ground water-lake interaction in the southern Tahoe Basin document Davis, CA University of California, Davis Masters Thesis paper 1987 publication date Woodling, 1987 Description information for South Lake Tahoe/Stateline Aquifer. Muehlberg, J.M., Schweickert, R.A., and Louie, J.N. 2003 Stratigraphic and geophysical studies if the Tahoe City sub-basin, Lake Tahoe, California document Abstracts with Programs v. 35, no. 6, p. 171 Unknown Geological Society of America paper 2003 publication date Muehlberg and others, 2003 Description information for Tahoe City/West Shore Aquifer(s) The Lake Tahoe Basin is composed of a variety of rock types ranging in age from Jurassic to Pleistocene and deposits of glacial, fluvial, and lacustrine origin ranging in age from Pliocene to Holocene (Saucedo, 2005). For purposes of this inventory, these rock units and deposits are grouped together as ten hydrogeologic units and one unit designated faults. The grouping of many geologic units into a few hydrogeologic units is based mainly on lithologic and probable hydrologic similarities among the geologic units. Some of the units, such as glacial and alluvial deposits, constitute the principal aquifers of the basin, whereas bedrock units usually impede the movement of ground water. However, any of the bedrock units can yield at least small quantities of water to wells, especially where fractured or deeply weathered. Tahoe_Geology 2007 Tahoe_Hydrogeology_Grp Polygon data were related to explanation table, hydrogeology_desc. Tahoe_Hydrogeology_Grp 2007 hydrogeology_desc Vector G-polygon 3039 Label point 4634 GT-polygon composed of chains 4634 Point 4 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_Hydrogeology Hydrogelogic groupings U.S. Geological Survey OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. Hydro_Grp Hydrogeologic unit code U.S. Geological Survey dom_hydrogeologic_Unit_cd U.S. Geological Survey Shape_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. Shape_Area Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. hydrogeology_desc Table ESRI rel_hydrogeology_desc Relationship class ESRI U.S. Geological Survey Ask USGS Water Webserver Team Address of the ESIC mailing

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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_Hydrogeology_Grp 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 Geodatabase12 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

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