Chapter 1 – Service Area and Water Demands
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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) ARAPAHOE WATER SUPPLY LEVEL II STUDY PREPARED FOR THE WYOMING WATER DEVELOPMENT COMMISSION & NORTHERN ARAPAHO UTILITIES PREPARED BY OCTOBER 2010 Errata – February 9, 2011 Arapahoe Water Supply, Level II Study, Final Report dated October, 2010 Consultant Contract Services No. 05SC0293891 Correction to Chapter VI, Page 5-6, WATER TRANSMISSION, Paragraph 2. Upgrading to a 12" Transmission Line Between the 1MG tank and 17-Mile Road This line is the top priority in the needed line upgrades for the Arapahoe system. The 1 million gallon tank at the top of the hill on Left Hand Ditch Road above Arapahoe is the only functional tank the Arapahoe system now has. The present transmission line from that tank to the rest of the system is a 1960’s vintage asbestos cement (AC) line. It is critically undersized to deliver even summer use demand, much less required fire suppression flows. This top priority line upgrade will replace the 6" AC line between the tank and the 12" PVC transmission main on 17- Mile Road with a 12" PVC line (Figure VI-3). It, in combination with the 8" line leaving the tank to the north, will meet the system’s tank-to-system delivery needs. The cost of this project is estimated to be $649,100629,400, of which $587,000419,180 is WWDC eligible. Correction to Chapter XI, Page 8, Table XI-2: Table of Financing, Priorities No. 3 and No. 4. Table XI-2: Table of Financing WWDC Arapahoe System Master Plan Recommended Improvements September 2010 20 Year Project Financing Funding Source WWDC RDA IHS Tribal Project Priority Project Description 3.25%, 20-year Direct Funding Ranking Total Project Cost 67% WWDC Grant 33% Matching 30% Grant 70% Loan Annual Payment 100% Tribal 1 Water Metering with Individual Service Connections $ 717,500 $ 215,250 $ 502,250 $ (34,544) 2 Tie in Wind River Well No. 3 $ 505,900 $ 336,929 $ 168,971 $ 50,691 $ 118,279 $ (8,135) 3 Loop the Transmission Line Between the Two Casinos $ 996,300 $ 663,536 $ 332,764 $ 99,829 $ 232,935 $ (16,021) Install 12" Transmission Line from 1 MG tank to 17-Mile 4 Road $ 629,400 $ 419,180 $ 210,220 $ 63,066 $ 147,154 $ (10,121) Extend the 12" Transmission Line From Goes-In-Lodge 5 Road East to Highway 789 $ 1,239,600 $ 825,574 $ 414,026 $ 124,208 $ 289,818 $ (19,933) 6 300,000 Gal. Concrete Tank and 10" Transmission Line $ 1,398,400 $ 931,334 $ 467,066 $ 140,120 $ 326,946 $ (22,487) Distribution System Improvements in the Great 7 Plains/Arapahoe Community Area $ 578,300 $ 173,490 $ 404,810 $ (27,842) 8 Looping of Rendezvous Road Line $ 390,400 $ 117,120 $ 273,280 $ (18,796) 9 Replace C'Hair Lane Lines $ 679,300 $ 203,790 $ 475,510 $ (32,705) South Left Hand Ditch Transmission Line and Industrial 10 Park Improvements $ 865,200 $ 576,223 $ 288,977 $ 86,693 $ 202,284 $ (13,913) 11 Demolition of Abandoned Tanks $ 16,000 $ 16,000 System Extension to Wind River Bridge and Little Wind 12 River Bottom Road $ 4,346,900 $ 4,346,900 Total Project $ 12,363,200 $ 3,752,777 1,882,023$ $ 1,274,257 2,973,266$ $ (204,498) $ 4,346,900 $ 16,000 WWDC Eligible $ 5,634,800 Non WWDC Eligible $ 6,728,400 Total Project $ 12,363,200 Less WWDC 2010 Funding of Project # 2, above $ (336,929) Total WWDC Grant (67% of unfunded, elligible proejcts) $ 3,415,847 Total RUS Grant $ 1,274,257 Total RUS Loan $ 2,973,266 Total Tribal $ 16,000 Total IHS Funding $ 4,346,900 FINAL REPORT ARAPAHOE WATER SUPPLY LEVEL II STUDY Submitted to: STATE OF WYOMING WATER DEVELOPMENT COMMISSION 6920 Yellowtail Road Cheyenne, Wyoming 82002 NORTHERN ARAPAHO TRIBE NORTHERN ARAPAHO UTILITIES P.O . Box 1304 Fort Washakie, Wyoming 82514 Prepared by: Civil Engineering Consultants 111 North 3,d Street East Riverton, Wyoming 82501 (307) 856-2444 In Association with: OCTOBER 2010 TABLE OF CONTENTS CHAPTER I CONCLUSIONS AND RECOMMENDATIONS ............................................................................................. 1 INTRODUCTION ..................................................................................................................................................... 1 CONCLUSIONS ........................................................................................................................................................ 2 RECOMMENDATIONS.......................................................................................................................................... 4 CHAPTER II SERVICE AREA AND WATER DEMANDS ................................................................................................... 1 INTRODUCTION ..................................................................................................................................................... 1 WATER SYSTEM OVERVIEW ............................................................................................................................ 2 DEMAND FORECAST ............................................................................................................................................ 5 ARAPAHOE WATER SYSTEM SERVICE POPULATION FORECAST .................................................... 8 WATER DEMAND FORECAST FOR STUDY AREA .................................................................................. 10 NEAR TERM DEMAND INCREASES ............................................................................................................. 12 WATER COSTS ..................................................................................................................................................... 12 CHAPTER III INVENTORY & EVALUATION OF THE EXISTING ARAPAHOE AREA SYSTEM .......................... 1 INTRODUCTION ..................................................................................................................................................... 1 WATER SUPPLY ..................................................................................................................................................... 2 PUMPHOUSE, SCADA SYSTEM, AND CHLORINATION TREATMENT ............................................... 9 TRANSMISSION SYSTEM ................................................................................................................................. 11 WATER STORAGE .............................................................................................................................................. 11 DISTRIBUTION SYSTEM .................................................................................................................................. 13 FIRE PROTECTION ............................................................................................................................................ 16 Arapahoe Water Supply Level II Study Table of Contents WATER PRODUCTION AND USAGE METERING .................................................................................... 19 SYSTEM LEAKAGE LOSSES ............................................................................................................................. 19 WORKS CITED ..................................................................................................................................................... 20 CHAPTER IV SYSTEM DEFICIENCIES AND RECOMMENDED SOLUTIONS ............................................................ 1 INTRODUCTION ..................................................................................................................................................... 1 WATER SUPPLY SOURCE ................................................................................................................................... 1 TREATMENT ........................................................................................................................................................... 3 STORAGE .................................................................................................................................................................. 3 TREATED WATER TRANSMISSION ............................................................................................................... 5 DISTRIBUTION SYSTEM ..................................................................................................................................... 6 RECOMMENDATIONS.......................................................................................................................................... 7 CHAPTER V GROUNDWATER ALTERNATIVES ................................................................................................................ 1 INTRODUCTION ..................................................................................................................................................... 1 WIND RIVER AQUIFER ......................................................................................................................................