State of Utah - Utah Geological Survey (UGS) 2008 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 UGS Special Study SS 127 Salt Lake City, UT Utah Geological Survey Gypsiferous_Rock_and_Soil withheld This dataset represents gypsiferous rock and soil 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 -113.721362 -113.241066 37.302616 36.990546 258764.955600 300580.624900 4097055.266600 4130613.141900 Utah geology hazards adverse-construction conditions gypsum gypsiferous rock gypsiferous soil 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 Shapefile 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. Dataset copied. withheld 20090730 15490800 Vector G-polygon 0 Simple Polygon FALSE 0 FALSE FALSE coordinate pair 0.000000 0.000000 meters Universal Transverse Mercator 12 0.999600 -111.000000 0.000000 500000.000000 0.000000 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 Gypsiferous_Rock_and_Soil Feature Class 0 Shape_Area Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. UGS_Unit UGS_Unit String 10 0 0 UGS 1:24,000-scale geologic map units SCS_SOIL SCS_SOIL String 7 NRCS soil map units FID FID String 10 Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. String 10 Class Gypsiferous-rock-and-soil-susceptibility category Float 19 11 class class Float 19 11 Shape_Leng Shape_Leng Double 19 0 0 Gypsum-bearing soil and rock are subject to dissolution of the gypsum, which causes a loss of internal structure and volume. Where the percentage of gypsum is 10 percent or more, dissolution can result in localized land subsidence and sinkhole formation (Mulvey, 1992; Muckel, 2004; Santi, 2005). Dissolution of gypsum may lead to foundation problems and may affect roads, dikes, underground utilities, and other infrastructure. Another common gypsum-related foundation problem is locally termed "water rock," which is a strongly indurated gypsum and calcium carbonate layer in the shallow subsurface in unconsolidated deposits. Soil Gypsiferous soil is considered an adverse construction condition and not a geologic hazard. Available data on gypsiferous soil in the study area are limited. The gypsiferous-soil categories are as follows: GSA Includes gypsiferous silt and clay and local gypsum, collectively referred to as gypcrete, that caps sloping irregular surfaces that cut across the Shnabkaib and upper red members of the Moenkopi Formation (Higgins, 1997), and gypsiferous alluvial and eolian deposits that contain clay- to boulder-sized sediments that typically weather to a soft, white, powdery gypsiferous soil (Biek, 2003a). These deposits crop out at the ground surface and typically are easily recognized. GSB Includes gypsum-bearing soils mapped by the NRCS (Mortensen and others, 1977). The gypsum in the soils is largely pedogenic (formed by dissolution and re-precipitation at depth during the soil-forming process) and its presence may not be apparent at the ground surface. ----------------------------------- Rock Gypsiferous rock is considered an adverse construction condition and not a geologic hazard. We grouped gypsum-bearing bedrock units (table 6) into three susceptibility categories (GRA, GRB, and GRC) on the Gypsiferous-Soil-and-Rock- Susceptibility Map (plate 8) based on the relative amount of gypsum present in the bedrock units that constitute each category. The gypsiferous-rock categories are as follows: GRA These bedrock units contain abundant gypsum, often in laterally continuous horizons up to several feet thick, and they and the alluvial deposits derived from them are commonly associated with dissolution and collapse features. This category includes the Woods Ranch Member of the Toroweap Formation, Harrisburg Member of the Kaibab Formation, Shnabkaib Member of the Moenkopi Formation, and the Temple Cap Formation. GRB These bedrock units lack massive gypsum deposits, but contain thin to medium beds and veins of gypsum interspersed with other rock types. These units and the alluvial deposits derived from them, contain sufficient gypsum locally to cause foundation or other problems. This category includes the Seligman Member of the Toroweap Formation; Timpoweap, lower red, Virgin Limestone, middle red, and upper red members of the Moenkopi Formation; Moenkopi Formation undivided; lower member of the Kayenta Formation; and the Carmel Formation. GRC These bedrock units contain gypsum in greater or lesser amounts (see above), but due to geologic or topographic complexities, individual rock unit subdivisions could not be recognized in the field at the scale of our mapping and therefore were mapped as undifferentiated. The extent to which these bedrock units, or the alluvial deposits derived from them, contain gypsum is not known, but areas where these rock units crop out should be carefully investigated for gypsum if development is planned. This category includes Permian-age rocks undivided; Toroweap and Kaibab Formations undivided; Brady Canyon and Seligman Members of the Toroweap Formation undivided; Triassic-age rocks undivided; and the Kayenta, Iron Springs, Carmel, and Temple Cap Formations undivided. DVD-ROM 0.000 0.000 20080616 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 http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile 20141217 16582900 FALSE 20080616 11554900 20080616 13143700 1.0 ESRI ArcCatalog 9.2.2.1350 Gypsiferous_Rock_and_Soil 258764.9556 300580.6249 4130613.1419 4097055.2666 1 -113.721362 -113.241066 37.302616 36.990546 1 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset 002 withheld 0.000 Shapefile NAD_1927_UTM_Zone_12N 0 20080616