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This is a digital document from the collections of the Wyoming Water Resources Data System (WRDS) Library. For additional information about this document and the document conversion process, please contact WRDS at [email protected] and include the phrase “Digital Documents” in your subject heading. To view other documents please visit the WRDS Library online at: http://library.wrds.uwyo.edu Mailing Address: Water Resources Data System University of Wyoming, Dept 3943 1000 E University Avenue Laramie, WY 82071 Physical Address: Wyoming Hall, Room 249 University of Wyoming Laramie, WY 82071 Phone: (307) 766-6651 Fax: (307) 766-3785 Funding for WRDS and the creation of this electronic document was provided by the Wyoming Water Development Commission (http://wwdc.state.wy.us) 51.1248 (North Uinta) A PROPERTY 0 FWRDSL LARAMIE, Wy IBRARY Project: 376-001 (307) 786-6asl FINAL PROJECT REPORT NORTH UINTA WATER SUPPLY PROJECT LEVEL II FEASIBILITY STUDY BEAR RIVER, WYOMING March 7, 2003 Prepared For: Wyoming Water Development Commission Herschler Building, 4-W 122 West 25th Street Cheyenne, WY 82002 and North Uinta County Improvement and Service District Town of Bear River 81 Elk Drive Bear River, WY 82930 TriHydro Corporation 920 Sheridan Street (307) 745-7474 Laramie, Wyoming 82070 FAX: (307) 745-7729 H:\PROJECTS\WWDC\NORTH UINTA\FINAL\376-o01\02 PHASE I\02PHASEIREPORT.DOC TABLE OF CONTENTS Chapter 1.0 INTRODUCTION ............................................................................................................. 1-1 2.0 WELL CONSTRUCTION AND DEVELOPMENT ............................................................. 2-1 2.1 Well Location ........................................................................................................ 2-1 2.2 Well Construction ....................................... ,......................................................... 2-1 2.3 Well Development ................................................................................................ 2-2 3.0 AQUIFER TESTING AND WATER QUALITY .................................................................. 3-1 3.1 Pump Configuration .............................................................................................. 3-1 3.2 Water Level Monitoring ......................................................................................... 3-2 3.3 Step Discharge Testing ........................, ............................................................ '.... 3-2 3.4 Post-Step Recovery Testing ........................, ........ : ................................................ 3-4 1 3.5 Constant Rate Discharge Testing ......................................................................... 3-4 3.6 Post-Pumping Recovery Testing ....., ..................................................................... 3-5 3.7 Water Quality Monitoring ...................................................................................... 3-5 3.8 Data Interpretation and Hydrogeologic Considerations ......................................... 3-7 3.8.1 Aquifer Testing Results .......................................................................... 3-7 3.8.2 Water Quality Testing Results ............................................................... 3-13 3.8.3 Hydrogeologic Considerations .............................................................. 3-13 3.8.4 Wellhead Protection Area Discussion ................................................... 3-18 4.0 AQUIFER TESTING AND WATER QUALITY OF MARTIN RANCH WELLS ................... 4-1 4.1 Pump Configuration .............................................................................................. 4-2 4.2 Water Level Monitoring ......................................................................................... 4-2 4.3 Constant Rate Discharge Testing ......................................................................... 4-3 4.4 Post-Pumping Recovery Testing .......................................................................... 4-3 4.5 Observation Well .................................................................................................. 4-3 4.6 Water Quality Monitoring ...................................................................................... 4-3 4.7 Data Interpretation and Hydrogeologic Considerations ......................................... 4-5 5.0 REFERENCES ................................................................................................................ 5-1 H:\PROJECTS\WWDC\NORTH UINTA\FINAL\376.Q01\02 PHASE I\02PHASEIREPORT .DOC LIST OF APPENDICES Appendix A CHRONOLOGY OF PROJECT ACTIVITIES B WELL CONSTRUCTION DATA, BOREHOLE LOG, AND GEOPHYSICAL LOGS, DEER MOUNTAIN #6 WELL C DATA PLOTS, DEER MOUNTAIN #6 WELL D DATA PLOTS, MARTIN RANCH WELLS H:\PROJECTS\WWDC\NORTH UINTA\FINAL\376.o01\02 PHASE I\02PHASEIREPORT.DOC LIST OF TABLES 1 Field Water Quality Data, Deer Mountain #6 Well, North Uinta County Water Supply Project, Bear River, Wyoming (April 2002) .................................................................. 3-6 2 Water Quality Data, Deer Mountain #6 Well, North Uinta Water Supply Project, Bear River, Wyoming (April 2002) ........................................................................................ 3-8 3 Generalized Stratigraphic Column, Bear River Area, Uinta County, Wyoming ............ 3-15 4 Field Water Quality Data, Martin Ranch Wells, Uinta County, Wyoming (April 18, 2002) ............................................................................................................ 4-4 5 Water Quality Data, Martin Ranch Wells, Uinta County, Wyoming (1980 - 2002) ........ 4-6 H:\PROJECTS\WWDC\NORTH UINTA\FINAL\376..()01\02 PHASE I\02PHASEIREPORT .DOC LIST OF FIGURES Figure Page 1 Project Location and Vicinity Map, North Uinta Water Supply Project, Unita County, Wyoming ..................................................................................................................... 1-3 2 Location Map, Martin Ranch Wells, Uinta County, Wyoming ....................................... 1-4 3 As-Built Construction Details, Deer Mountain #6 Well, Bear River, Wyoming .............. 2-3 4 Location and Generalized Geology Map, North Uinta Water Supply Project, Bear River,· Uinta County, Wyomi·ng ............................................................................................... 3-3 5 Conceptual Geologic Cross Section, North Uinta Water Supply Project, Bear River, Wyoming .'................................................................................................................... 3-16 H:\PROJECTS\WWDC\NORTH UINTA\FINAL\376-o01\02 PHASE I\02PHASEIREPORT.DOC CHAPTER 1.0 INTRODUCTION TriHydro Corporation, under contract to the Wyoming Water Development Commission (WWDC), conducted this Level II Feasibility Study with our sub-consultant, Forsgren Associates, Inc., of Evanston, Wyoming. The WWDC authorized the Level II study to determine the feasibility of developing a groundwater supply of sufficient quantity and quality for public drinking water purposes for the North Uinta County Improvement and Service District (NUCISD), located in the newly incorporated Town of Bear River, Wyoming The public water system of the Deer Mountain Ranches Subdivision in the Town of Bear River is identified by the U.S Environmental Protection Agency (USEPA) as Public Water System (PWS) #WY5601019, which serves a population of approximately 180 people. This public water system serves approximately one-quarter of the population of the Town of Bear River (560 people). ' The location of the test well was selected based on the hydrogeologic investigation of the area conducted during 1999 and 2000 und~r the Level I Water Supply Master Plan Study. The results of this investigation are presented in a document entitled "Hydrogeologic Report, North Uinta County Improvement and Service District, Water Supply Master Plan, Uinta County, Wyoming, February 4, 2000," by TriHydro Corporation. This document is included as an appendix in the "North Uinta County Improvement and Service District, Water Supply Master Plan, Levell Study, September 2000," submitted to the WWDC by Forsgren Associates, Inc., Evanston, Wyoming. Based on results of the Level I Master Plan Study, WWDC approved commencement of Level II, Phase I well construction and aquifer testing activities in 2001. The objectives of the Level II, Phase I drilling program were to: • Determine the depth, thickness, and geologic character of productive aquifer underlying the selected test well site; Determine depth to groundwater and aquifer thickness and to construct a potential public water system supply well at the selected site; • Conduct aquifer tests designed to determine the hydraulic character and estimate the production capabilities of the aquifer(s) penetrated at the selected well site; and . • Estimate the quality of groundwater available from the aquifer(s). These Phase I objectives were accomplished through execution of the following tasks: 1. Construction of one test well, designated the Deer Mountain #6 Well; 2. Well development; 3. Aquifer testing; and 1-1 H:\PROJECTS\WWDC\NORTH UINTA\FINAL\376.Q01\02 PHASE I\02PHASEIREPORT.DOC 4. Water quality testing. The Deer Mountain #6 Well was constructed, developed, and tested from February to April 2002. The test well was completed to a depth of 544 feet in the Wasatch Formation. Results of the aquifer testing and water quality evaluations indicated that it is feasible to use the well as a public water supply. The data collected during