Michael G. Rupert L. Niel Plummer 2009 vector digital data U.S. Geological Survey Data Series USGS DS 458 Denver, CO U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir095082_bnd This vector data set delineates the approximate boundary of the Eagle River watershed valley-fill aquifer (ERWVFA). This data set was developed by a cooperative project between the U.S. Geological Survey, Eagle County, the Eagle River Water and Sanitation District, the Town of Eagle, the Town of Gypsum, and the Upper Eagle Regional Water Authority. This project was designed to evaluate potential land-development effects on groundwater and surface-water resources so that informed land-use and water management decisions can be made. The boundary of the ERWVFA was developed by combining information from two data sources. The first data source was a 1:250,000-scale geologic map of the Leadville quadrangle developed by Day and others (1999). The location of Quaternary sediments was used as a first approximation of the ERWVFA. The boundary of the ERWVFA was further refined by overlaying the geologic map with Digital Raster Graphic (DRG) scanned images of 1:24,000 topographic maps (U.S. Geological Survey, 2001). Where appropriate, the boundary of the ERWVFA was remapped to correspond with the edge of the valley-fill aquifer marked by an abrupt change in topography at the edge of the valley floor throughout the Eagle River watershed. The boundary of the ERWVFA more closely resembles a hydrogeomorphic region presented by Rupert (2003, p. 8) because it is based upon general geographic extents of geologic materials and not on an actual aquifer location as would be determined through a rigorous hydrogeologic investigation. The purpose of this vector data set is to delineate the approximate boundary of the Eagle River watershed valley-fill aquifer, Eagle County, North-Central Colorado, 2006-2007. Please refer to the following associated publication for a complete description of how this data set was developed: Rupert, M.G., and Plummer, L.N., 2009, Groundwater quality, age, and probability of contamination, Eagle River Watershed Valley-Fill Aquifer, North-Central Colorado, 2006-2007: U.S. Geological Survey Scientific Investigations Report 2009-5082, 59 ., accessed August 11, 2009, at http://pubs.usgs.gov/sir/2009/5082/. This data set was developed to establish the study-area extent for three associated raster data sets that were developed as part of this study: (1) The probability of elevated nitrate concentrations in groundwater (sir090582_no3). (2) The probability of unmixed young groundwater (defined using chlorofluorocarbon-11 concentrations and tritium activities)(sir090582_mix). (3) The probability of elevated volatile organic compound (VOC) concentrations in groundwater (sir090582_voc). REFERENCE: Rupert, M.G., 2003, Probability of detecting atrazine/desethyl-atrazine and elevated concentrations of nitrate in ground water in Colorado: U.S. Geological Survey Water-Resources Investigations Report 2002-4269, 35 p., accessed June 17, 2009, at http://pubs.usgs.gov/wri/wri02-4269/. 2006-2007 publication date Complete None planned -107.115526 -106.275574 39.717408 39.545337 None probability of groundwater contamination vulnerability susceptibility nitrate ground water groundwater contamination probability volatile organic compound VOC aquifer groundwater age logistic regression CFC chlorofluorocarbons inlandWaters None Eagle County, CO Vail, CO Gypsum, CO Eagle, CO Dotsero, CO Eagle River Brush Creek Gypsum Creek Eagle River Watershed Colorado Wolcott, CO Edwards, CO Minturn, CO None 2006-2007 None This aquifer boundary more closely resembles a hydrogeomorphic region presented by Rupert (2003, p. 8) because it is based upon general geographic extents of geologic materials and abrupt changes in topography, and not on an actual aquifer location as would be determined through a rigorous hydrogeologic investigation. As such, this aquifer boundary should be considered diagrammatic in nature. U.S. Geological Survey Director, Colorado Water Science Center mailing address

Box 25046, MS 415, Denver Federal Center

Lakewood CO 80225 USA (303) 236-4882 (303) 236-4912 GS-W-COden DC@usgs.gov (Warning: Although accurate at the time of production, this contact information may have become obsolete. See the Metadata_Reference_Information section for a current contact.) This data set was developed through a cooperative project with the U.S. Geological Survey, Eagle County, the Eagle River Water and Sanitation District, the Town of Eagle, the Town of Gypsum, and the Upper Eagle Regional Water Authority. None Unclassified None Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.3.1.1850 U.S. Geological Survey 2009 document Scientific Investigations Report 2009-5082 Denver, Colorado U.S. Geological Survey http://pubs.usgs.gov/sir/2009/5082/ See Entity Attribute information. A visual check of the data set using ArcEdit showed no dangling arcs, unclosed polygons, or other irregularities. The locations of the arcs should be considered diagrammatic in nature because they are based upon general geographic extents of geologic materials and not on an actual aquifer location as would be determined through a rigorous hydrogeologic investigation. In many locations, the arcs were digitized on a computer screen using digital raster graphics files of the 1:24,000 scale topographic maps as the background. Not known Not Applicable Day, W.C., Knepper, D.H., Jr., Green, G.N., and Phillips, R.C. 1999 vector digital data Open-File Report 99-427 Denver, CO U.S. Geological Survey http://pubs.usgs.gov/of/1999/ofr-99-0427/ 250000 online 1999 publication date Digital geologic map Used to delineate the Eagle River watershed valley-filll aquifer boundary U.S. Geological Survey 2001 raster digital data Fact Sheet FS-088-01 Rolla, MO U.S. Geological Survey http://erg.usgs.gov/isb/pubs/factsheets/fs08801.html 24000 disc 2006-2007 publication date Digital raster graphics Used to delineate the Eagle River watershed valley-fill aquifer boundary The boundary of the Eagle River watershed valley-fill aquifer (ERWVFA) was developed by combining information from two data sources. The first data source was a 1:250,000-scale geologic map of the Leadville quadrangle developed by Day and others (1999). The location of Quaternary sediments was used as a first approximation of the ERWVFA. The boundary of the ERWVFA was further refined by overlaying the geologic map with Digital Raster Graphic (DRG) scanned images of 1:24,000 topographic maps (U.S. Geological Survey, 2001). Where appropriate, the boundary of the ERWVFA was remapped to correspond with the abrupt change in topography at the edge of the valley floor throughout the Eagle River watershed. The boundary of the ERWVFA more closely resembles a hydrogeomorphic region presented by Rupert (2003, p. 8) because it is based upon general geographic extents of geologic materials and not on an actual aquifer location as would be determined through a rigorous hydrogeologic investigation. 200804 Vector G-polygon 1 Label point 1 GT-polygon composed of chains 1 Point 4 Albers Conical Equal Area 37.500000 40.500000 -105.500000 37.000000 0.000000 0.000000 row and column 10.000000 10.000000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 sir095082_bnd.aat Arc Attribute Table ESRI FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. FNODE# Internal node number for the beginning of an arc (from-node). ESRI Whole numbers that are automatically generated. TNODE# Internal node number for the end of an arc (to-node). ESRI Whole numbers that are automatically generated. LPOLY# Internal node number for the left polygon. ESRI Whole numbers that are automatically generated. RPOLY# Internal node number for the right polygon. ESRI Whole numbers that are automatically generated. LENGTH Length of feature in internal units. ESRI Positive real numbers that are automatically generated. SIR095082_BND# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SIR095082_BND-ID User-defined feature number. ESRI Sequential unique whole numbers that are automatically generated. sir095082_bnd.pat Polygon Attribute Table ESRI 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 Positive real numbers that are automatically generated. PERIMETER Perimeter of feature in internal units. ESRI Positive real numbers that are automatically generated. SIR095082_BND# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SIR095082_BND-ID User-defined feature number. ESRI Sequential unique whole numbers that are automatically generated. NAME Boundary of Eagle River watershed valley-fill aquifer Creator EAGLE RIVER WATERSHED VALLEY-FILL AQUIFER Name of area within polygon Author This vector data set delineates the approximate boundary of the Eagle River watershed valley-fill aquifer. Rupert, M.G., and Plummer, L.N., 2009, Ground-Water Quality, Age, and Probability of Contamination, Eagle River Watershed Valley-Fill Aquifer, North-Central Colorado, 2006-2007: U.S. Geological Survey Scientific Investigations Report 2009-5082, 59 p., accessed august 11, 2009, at http://pubs.usgs.gov/sir/2009/5082/. U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

507 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+sir095082_bnd 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. 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. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. ASCII PKZIP compression Winzip 0.251 MB http://water.usgs.gov/GIS/dsdl/sir095082_bnd.e00.zip None. This dataset is provided by USGS as a public service. 20090812 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+sir095082_bnd FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time ESRI Metadata Profile