Shallow Groundwater Adverse-Construction Condition St. George - Hurricane Metropolitan Area, Washington County, Utah

State of Utah - Utah Geological Survey (UGS) 2008 Shallow Groundwater Adverse-Construction Condition St. George - Hurricane Metropolitan Area, Washington County, Utah None vector digital data UGS Special Study SS 127 Salt Lake City, UT Utah Geological Survey Digital data at 1:24,000 William R. Lund, Tyler R. Knudsen, Garrett S. Vice, and Lucas Shaw; Utah Geological Survey 2008 GEOLOGIC HAZARDS AND ADVERSE CONSTRUCTION CONDITIONS ST. GEORGE - HURRICANE METROPOLITAN AREA, WASHINGTON COUNTY, UTAH UGS Special Study SS 127 Salt Lake City, UT Utah Geological Survey Shallow_Groundwater This dataset represents shallow groundwater adverse-construction condition St George - Hurricane metropolitan area, Washington County, Utah at a scale of 1:24,000. The data can be used for analysis and display at 1:24,000. The purpose of this study is to provide planners and other city and county officials with information on the kind and location of geologic hazards and adverse-construction conditions that may impact existing and future development in the St. George - Hurricane metropolitan area. en 2008 publication date Complete None planned -113.756085 -113.242220 37.358328 36.991875 255864.343700 300483.375000 4097286.000000 4136800.749900 Utah geology hazards adverse-construction conditions shallow groundwater Utah St George Hurricane Washington County None Although this product represents the work of professional scientists, the Utah Department of Natural Resources, Utah Geological Survey, makes no warranty, expressed or implied, regarding its suitability for a particular use, and does not guarantee accuracy or completeness of the data. The Utah Department of Natural Resources, Utah Geological Survey, shall not be liable under any circumstances for any direct, indirect, special, incidental, or consequential damages with respect to claims by users of this product. For use at 1:24,000 scale only. Data released to the Receiving Agency (RA) remains the property of the originating data source (see Source_Information) and cannot be reproduced for sale by the RA without the written consent of that data source. Redistribution of datasets unchanged as obtained from UGS and without fee is allowed. Any hardcopies utilizing these data sets shall clearly indicate their source. If the RA has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. RA specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by UGS. Tyler Knudsen Utah Geological Survey (UGS) - Cedar City Office Geologist mailing and physical address

88 E Fiddler Canyon Rd., Ste. C

Cedar City UT 84720 USA

1594 W North Temple, Suite 3110

Salt Lake City UT 84116 USA 435-865-9041 tylerknudsen@utah.gov GIS Data: Garrett Vice, Tyler Knudsen, Lucas Shaw (UGS) Project Manager: Gary Christenson, (UGS (Ret.)) Review: Utah Geological Survey None Unclassified None ESRI ArcCatalog 9.2.2.1350 File Geodatabase Feature Class Feature attributes were taken from the source material. Code assignments are believed to be representative of source materials. UGS estimates the accuracy to be close to, but not completely conforming to, the 1:24,000 scale UGS standards. Vector Simple FALSE 0 TRUE FALSE coordinate pair 0.000100 0.000100 meters North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 GCS_North_American_1927 NAD_1927_UTM_Zone_12N 0.000010 Explicit elevation coordinate included with horizontal coordinates ghShallowGroundwater Feature Class 0 OBJECTID OBJECTID OID 4 10 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape_Leng Shape_Leng Double 8 38 8 Shape Feature geometry. ESRI Coordinates defining the features. Shape Geometry 8 0 0 SGSHazardU SGSHazardU String 50 0 0 Location Location String 254 0 0 Publicatio Publicatio String 50 0 0 SGSHazardL SGSHazardL String 50 0 0 Susceptibi Susceptibi String 50 0 0 Shape.STArea() Shape.STArea() Double 0 0 0 Shape.STLength() Shape.STLength() Double 0 0 0 Ground water is water in saturated zones beneath the land surface in soil and rock at various depths. Ground water fills fractures and pore spaces in rocks and voids between grains in unconsolidated deposits (clay, silt, sand, and gravel). Ground water can be one of the most costly factors in construction and land development if it is not recognized and taken into consideration in the planning process (Shelton and Prouty, 1979). However, shallow ground water rarely if ever causes rapid, catastrophic property damage or is a threat to life safety; therefore, for purposes of this study, shallow ground water is considered an adverse construction condition and not a geologic hazard. SHALLOW GROUND-WATER CLASSIFICATION Soils in the study area that are either naturally wet or have a greater than normal potential to develop wet conditions are labeled SGW1, SGW2, and SGW3 on the accompanying Shallow Ground-Water-Susceptibility Map (plate 14). Because shallow ground water represents an adverse construction condition and not a geologic hazard, the shallow ground-water classifications below do not represent relative severity rankings (Low, Medium, High) as is the case on the hazard maps prepared for this study. The shallow ground-water categories are as follows: SGW1 Naturally wet soils mapped by the NRCS (depth to groundwater < 60 inches), and soils mapped by the NRCS as poorly drained or frequently irrigated where water-well or geotechnical information indicates a significant area of permanent shallow ground water (< 10 feet). Construction in these areas will likely encounter shallow ground water at depths < 10 feet, and basements and other water-sensitive underground facilities are not recommended without adequate drainage or other protection. Following development, lawn watering and other sources of urban runoff may cause ground-water levels to rise even higher in these areas. SGW2 Poorly drained, generally fine-grained soils mapped by the NRCS that may develop shallow ground water locally when rates of water application exceed the soil's drainage capacity. Subsurface drains are frequently required to prevent these soils from becoming saturated. Because these soils naturally drain slowly, they may remain wet for most of the year, even though water is applied only during the growing season. Permanent shallow ground water is possible following urbanization. SGW3 Moderate to freely draining soils mapped by the NRCS that are commonly irrigated for agricultural purposes. Where high rates of water application occur, these soils may develop seasonally shallow ground water, but typically drain quickly once water application stops or is reduced below the soil's drainage capacity. Seasonal or transient shallow ground water is possible following urbanization. DVD-ROM 0.000 20080613 Utah Geological Survey Geologic Hazards Program GIS Analyst 1594 West North Temple Suite 3110 Salt Lake City UT 84116 USA 801-537-3386 801-538-4810 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time en {5C70EA06-C4D7-4096-BB53-05017BEB2A6C} 20080516 15034600 FALSE 20250908 11433900 20250908 11433900 ghShallowGroundwater 002 0.000 Projected GCS_North_American_1927 Linear Unit: Meter (1.000000) NAD_1927_UTM_Zone_12N <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.5.0'><WKT>PROJCS["NAD_1927_UTM_Zone_12N",GEOGCS["GCS_North_American_1927",DATUM["D_North_American_1927",SPHEROID["Clarke_1866",6378206.4,294.9786982]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-111.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",26712]]</WKT><XOrigin>-5121000</XOrigin><YOrigin>-9998000</YOrigin><XYScale>10000</XYScale><ZOrigin>0</ZOrigin><ZScale>1</ZScale><MOrigin>0</MOrigin><MScale>1</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>26712</WKID><LatestWKID>26712</LatestWKID></ProjectedCoordinateSystem> Esri ArcGIS 13.5.0.57366 ghShallowGroundwater 255864.3437 300483.375 4136800.7499 4097286 1 -113.756085 -113.24222 37.358328 36.991875 1 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset 002 withheld Local Area Network File Geodatabase Feature Class Enterprise Geodatabase Feature Class 0.000 NAD_1927_UTM_Zone_12N EPSG 7.2(3.0.1) 0 20250908