Rose L. Medina 1999 map Carson City, NV U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?wrir99-4188_wla David L. Berger and Rose L. Medina 1999 Water-Resources Investigations Report 99-4188 Carson City, NV U.S. Geological Survey This data set contains the ground-water-level contours derived from ground-water monitoring sites in Carson Valley, west-central Nevada. The data set is part of a spatial ground-water data base in Carson Valley. This data set was created to display the ground-water-level contours used to develop a spatial ground-water data base for Carson Valley. Introduction This data set, created in cooperation with the State of Nevada Division of Environmental Protection, contains ground-water-level- altitude (WLA) contours developed to be included in a spatial ground-water data base in Carson Valley, west-central Nevada. The WLA contours were hand drawn and digitized in 1998 using a 1:62,500- scale mylar separate base map. The base map is a mosaic of four 1:62,500-scale maps; Carson City, Nev. (1950), Dayton, Nev. (1956), Freel Peak, Calif.-Nev. (1956), and Mt. Siegel, Nev.-Calif. (1957). Reviews The digital data in this data set has gone through a rigorous, multi-level, quality-control process that ensures the data set is a fair representation of the source map. If errors are found in this data set, it will be appreciated if the user would pass this information to the Metadata_Contact. Two reviews were done. The reviewers were asked to check metadata and other documentation files for completeness and accuracy. Reviewers were asked to check the topological consistency, tolerances, projections, and geographic extent. References Cartier, K.D., Peltz, L.A., and Smith, J.L., 1994, Development and documentation of spatial data bases for the Lake Tahoe Basin, California and Nevada: U.S. Geological Survey Water-Resources Investigations Report 93-4182, 65 p. Environmental Systems Research Institute, Inc. (ESRI), 1998, ARC/INFO Version 7.2.1 Help: Redlands, Calif., [on-line documentation]. Notes 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 ARC/INFO-specific terminology. April/May 1998 ground condition Complete None Planned -119.84248477 -119.63902871 39.08671377 38.85360292 none water-level altitude contour inlandWaters none Carson Valley west-central Nevada Douglas County Great Basin HA105 None. Use with similarly scaled data. Acknowledgment of the U.S. Geological Survey and the State of Nevada Division of Environmental Protection would be appreciated in any products derived from this data. Rose L. Medina U.S. Geological Survey Physical Scientist mailing and physical address

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Carson City NV 89706 USA 1-888-275-8747 (775) 887-7629 rlmedina@usgs.gov Compilation of this data set and the associated metadata was done in cooperation with the State of Nevada Division of Environmental Protection. None Unclassified None IRIX64, 6.4, IP27 UNIX ARC/INFO version 7.2.1 Rose L. Medina 1999 map Carson City, NV U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?wrir99-4188_dtw David L. Berger and Rose L. Medina 1999 Water-Resources Investigations Report 99-4188 Carson City, NV U.S. Geological Survey Rose L. Medina 1999 map Carson City, NV U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?wrir99-4188_cv_x David L. Berger and Rose L. Medina 1999 Water-Resources Investigations Report 99-4188 Carson City, NV U.S. Geological Survey Three visual checks were done to verify that the digital attribute data was a fair representation of the original source map. See Explanation. Where present, is described with each attribute defined in the Entity_and_Attribute Section. Chain-node topology present. See Supplemental_Information. Verification plots were generated at 1:62,500-scale and overlaid on the original map. Corrections were made until no light was visible between the original line and the digitized line (Cartier and others, 1994). Three visual checks were done to verify that the digital data was a fair representation of the original source map. 32 meters The water-level altitude contours were created from 1:62,500-scale maps. The error inherent from the scale is at least 32 meters on the x-y. Errors derived from the quality of the original map or found during the automation process also can affect the accuracy of this data. With an RMS = 0.003 meters, the maximum error is estimated at 35 meters on the x-y. David L. Berger Unpublished material map 62500 mylar separate 1998 ground condition on April/May 1998 none The water-level altitude contours data set was digitized from this mylar base map. The WLA contours were hand drawn in 1998 at 1:62,500-scale on a mylar base map. 1998 1. The water-level altitude contours were digitized directly into UTM, Zone 11 from the original mylar base map with an RMS = 0.003. 2. Contours were attributed. 3. Line topology was built using the ARC/INFO(R) CLEAN command with the fuzzy tolerance = 0.001 meters and dangle = 0.01 meters (ESRI, 1998). 4. Positional and attribute accuracy was verified. 199807 Vector String 144 Universal Transverse Mercator 11 coordinate pair 0.001 0.001 Meters North American Datum of 1927 Clarke 1866 6378206.4 294.98 WLA.AAT Arc Attribute Table ARC/INFO(R) GIS Software FNODE# Internal number of from-node Computed Sequential unique positive integer n/a n/a TNODE# Internal number of to-node Computed Sequential unique positive integer n/a n/a LPOLY# Internal number of polygon to left of arc Computed Sequential unique positive integer n/a n/a RPOLY# Internal number of polygon to right of arc Computed Sequential unique positive integer n/a n/a LENGTH Length of arc in coverage units Computed Positive real numbers n/a n/a WLA# Internal feature number Computed Sequential unique positive integer n/a n/a WLA-ID User-assigned feature number User defined Integer n/a n/a WLA-FT Water-level altitude, in feet User defined 4640 5090 2.5 The measurement has an accuracy of +/- 2.5 ft and was rounded to the nearest 10 ft. It was derived from the difference between land-surface altitude and depth to water. CONFIDENCE contour location confidence level User-defined Uncertain location of contour is uncertain User defined Certain location of contour is certain User defined U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Although this data set has 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 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. Export Full data set zipped 1 http://water.usgs.gov/GIS/dsdl/wrir99-4188_wla.e00.gz SDTS Full data set zipped 1 http://water.usgs.gov/GIS/dsdl/wrir99-4188_wla.sdts.tar.gz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team 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+wrir99-4188_wla FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998