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1 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 wrds@uwyo.edu and include the phrase Digital Documents in your subject heading. To view other documents please visit the WRDS Library online at: Mailing Address: Water Resources Data System University of Wyoming, Dept E University Avenue Laramie, WY Physical Address: Wyoming Hall, Room 249 University of Wyoming Laramie, WY Phone: (307) Fax: (307) Funding for WRDS and the creation of this electronic document was provided by the Wyoming Water Development Commission (

2 Rock Springs East Water Supply Master Plan Level Study Executive Summary Prepared for: Wyoming Water Development Commission Prepared by: Leon R. Kjellgren, P.E Foothill Blvd. Suite 210 Rock Springs, Wyoming November 1995

3 . NTRODUCTON.1 Project History and Purpose This Level 1 Reconnaissance study was authorized by the Wyoming Water Development Commission (WWDC) on June 2, 1995, in response to a project application request submitted by the Green River-Rock Springs-Sweetwater County Joint Powers Water Board (JPWB) on September 26, The initial project application was prompted by a request from a local industry, SF Phosphates Limited Co., to the sponsor (JPWB) for a substantial increase in water supply to meet future industrial process needs. Coincidentally, at the same time a project application was also submitted by the homeowners within Arrowhead Springs Subdivision requesting examination of water supply alternatives to supplement the individual wells serving their area. Both project application requests were combined for the purpose of performing an area-wide study for the benefit of all water users east of Rock Springs, including the Rock Springs-Sweetwater County Airport. The purpose of this study is to identify water source supply alternatives available to the Rock Springs East Service Area as depicted in Figure ES-1. n addition, this study examines preliminary transmission, storage, and treatment requirements necessary to deliver each water supply al ternative to the area water users. Finally, the study presents budgetary costs associated with the recommended water supply development and transmission system alternatives.. WATER USERS AND PROJECTED DEMAND REQUREMENTS.1 Existing and Potential water Users As shown on Figure ES-1, there are three existing water users within the defined study service area; Arrowhead Springs subdivision, SF Phosphates, and the Rock Springs-Sweetwater County Airport. Two additional potential areas of development within the service area have been designated by Sweetwater County planning officials. They include an industrial facility in South Baxter Basin between SF Phosphates and the Airport, and a potential commercial development at the Baxter nterchange on The industrial facility was identified because of the proximity of the SF Phosphates rail spur and a paved County highway, easy access to 1-80 and the airport, and its general location in relation to Rock Springs. The commercial facility was identified because of significant previous interest expressed in the site for development of a truck stop facili ty. According to the Sweetwater County ES-1

4 Economic Development Association r the non-availability of water at that location is a prime reason why the development has not yet occurred..2 Projected Demand Requirements Projected future water demand requirements for each of the existing and potential water users within the service area are shown in Table ES-1. nformation in the Table assumes a full development scenario for each of the water users as described in the final report.. AVALABLE SUPPLY SOURCES AND NFRASTRUCTURE REOUREMENTS This study examines the viability of two water sources, groundwater, and extension of the JPWB transmission system currently serving the City of Rock Springs r to supply the water needs of the Rock Springs East Service Area. The findings of the study in regards to available supplies to each of the three existing water users are as indicated below:.1 SF Phosphates-The only supply source available to SF Phosphates is the extension of the JPWB transmission system. Based on the requested continuous demand of 3000 gpm, groundwater is not considered to be a viable alternative in this application. (See Section V of report.) The proposed configuration for the JPWB system extension to SF Phosphates is shown on Figure ES-2..2 Arrowhead Springs- The JPWB system is a viable supply source for Arrowhead Springs. (See Figure ES-2). Alternately, potential groundwater supplies may be available to meet existing and limited future needs of the development. Figure ES-3 shows the possible configuration of the supply, storage, and transmission system under the Arrowhead springs groundwater source alternative..3 Rock Springs-Sweetwater County Airport-The JPWB system is a possible supply source for the airport facility. (See Figure ES-2). Al ternately, a potential groundwater supply source capable of meeting limited existing demand only may be available. Figure ES-4 shows the potential well location and transmission supply line under the airport groundwater source alternative. V.l Cost Estimates V. ECONOMC ANALYSES The following Level cost estimate information is presented as it pertains to the alternatives available to each of the three existing users. Costs pertaining to the extension of the JPWB system are based upon the proj ect cost allocation scenario as developed under Section V.l of the final report. ES-2

5 V.1.1 SF Phosphates-Tables ES-2 and ES-3 present construction cost breakdowns for project components assumed to be allocable to SF Phosphates under a JPWB supply al ternati ve. Proj ect component differences within each Table relate to alternate pumping scenarios which may be utilized to deliver water from the JPWB system to the proposed storage facility in Section 8, T18N, R104W, as shown in Fig. ES-2. V.1.2 Arrowhead Springs-Table ES-4 presents a construction cost breakdown for the groundwater supply alternative. Tables ES-S and ES-6 present construction cost breakdowns for project components assumed to be allocable to Arrowhead Springs under a JPWB supply al ternative. (ncludes line and related components between SF Phosphates and Arrowhead springs). Project component differences within each Table relate to the line size options (8" or 10") extended to the Arrowhead Springs area. V.1.3 Rock Springs-Sweetwater County Airport-Table ES-7 presents a construction cost breakdown for the groundwater supply alternative. Tables ES-8, ES-9, and ES-10 present construction cost breakdowns for project components assumed to be allocable to the airport under a JPWB supply alternative. (ncludes line and related components between Highway 430 below the storage facility and the airport). Project component differences within each Table relate to line size options (10", 12", or 14") extended to the airport area. V.2 Ability-to-Pay Analyses-Table ES-11 presents an ability-to-pay summary for the SF Phosphates facility. Table ES-12 presents similar summaries for Arrowhead Springs and the Airport for all alternatives investigated for each entity. V. RECOMMENDATONS sufficient alternatives and cost analyses have been presented under the report to allow all involved parties to assess their individual benefit regarding further participation in this project. The next step must be for each of the parties to decide whether or not they favor carrying this project to the next level of investigation. These decisions cannot be based solely on engineering considerations, but must be reflective of individual personal, political, and financial capabilities. The Airport facility has three basic alternatives. They can choose to continue under the existing situation, they can choose further investigation of the potential groundwater source, or they can pursue extension of the JPWB system. f they choose the groundwater source, then a Level study is recommended to verify the existence of an adequate supply. f they choose the JPWB source then they must also select the level of service that they desire (10", 12" or 14" supply line). ES-3

6 Arrowhead Springs residents have the same alternatives. t is recommended, however, that extension of the JPWB system be considered as a preferred supply source over groundwater. Projected monthly cost differentials between the two are not that substantial considering comparisons of overall system reliability and projected water quality. Again, the desired level of service (8 11 or 10" supply line) must be determined. SF Phosphates must evaluate the costs of water supply from the JPWB vs. other al ternati ves which may be available to them. Other possible water sources, with the exception of groundwater, were not examined as a part of this study. Finally, all parties interested in further investigation of JPWB service extension to their areas are encouraged to jointly review the project cost allocation criteria assumed in the report. (See Section V.) These discussions must include the WWDC and the JPWB. Alterations to the assumed cost allocation may be necessary to more fairly distribute project costs among the entities involved. ES-4

7 Figures and Tables

8 ~ ,~ ~ BAXTER POTENTAL COM DEVELOPMENT 15 \, 16 \ / "/ 19 :0 N i SCALE 1"=5000' 32 -,,- J3 T 19 N T 18 N &\\ :\\ ->- \ CJ,\\ ~~ 54 "v--' \ \P \ \\ \ \ \ 2\ \ \ \ \ J~, 3&, 31, ----Ojo ( r J n LEGEND PROPOSED SERVCE AREA BOUNDARY r , l J POTENTAL WATER USE AREA EXSTNG WATER USER ~~~.~~ ~tt_------_--- +~ "., 28 " '; ARROWHEAD SPRNGS --.~,,---f-~ -,~' :~!T"'~~~~~~rVSON,. L! -- --! ~ ~----~ 35 J6, FCURE ES-1 SERVCE AREA BOUNDARY MAP ROCK SPRNCS EAST FrATER SUPPLY MASTER PLAN SCALE 1" = 5000'

9 Table ES -1 ~tudy Area Demalld SYm_rn~ti'Q[l Sheet Bocl~_Sprillqs East Wat~~~upp!y_Master Plal1 (1) Calculated as the sum of required fire flow and avelrage daily demand. (:!) Storage requirements for SF Phc.sphates not a functi.on of fire flow and average daily demand. (3) Corresponds to a demand requirement of 3000 gallons per minute (gpm) of continuous flow as requested by SF Phosphates.

10 / BAXTER POTENTAL COM DEVELOPMENT 16 \ ,r=_-----=::: N 28 SCALE 1 "=5000' p 32 JJ T 19 N T 18 N v:\\ ":o~ i> \' %, -:s.. ~ 34 1'", \ <;p, \\ 35, \, \, c., ~, ~...,, ~,, ~ r_-- ~../ ~ SECTON 8 *" STORAGE FACUTY~~8' LEGEND PROPOSED SERVCE AREA BOUNDARY, , L -' 1 POTENTAL WATER USE AREA EXSTNG WATER USER PROPOSED PPElJNE ALGNMENT N n 0 Q: j l6 2! ARROWHEAD SPRNGS PHASE 1 SUBDVSON ( RESDENTAL) 34 :' FCURE ES-2 TRANSMSSON SYSTEM ALCNMENT JPYB SUPPLY ALTERNATVE ROCK SPRNCS EAST /YATER SUPPLY MASTER PLAN SCALE f' = 5000'

11 FCURE ES-3 FACLTY LOCATON ljrawnc ARROWHEAlJ SPRNCS CROUNlJWATER SUPPLY ALTERNA TVE ROCK SPRNCS EAST WATER SUPPLY MASTERPLAN

12 1" = 3000' FCURE ES-4 LOCATON.oRA WNC ARPORT CROUN.oWATER SUPPLY ALTERNATVE ROCK SPRNCS EAST WATER SUPPLY MASTER PLAN

13 Table ES-2 construction Cost Breakdown SF Phosphates JPWB Supply Alternative (Single Pump Station Scenario) iork tell const. Non-Const. tells tems 1 Preparation of Final Designs and Specifications $150,000 Permitting and Litigation J $10!000 Legal Fees $5,000 MUlsition of Access and Right-oi-Way $20,000 ProJect Components 1 j 32,0(0 feet 181! waterline at $43.00 per foot $1,376,000 2 ; Bltn. Tanks Pump Statio!! HP pumps, 1750 gpm, 600' TDH $375,000 1 ' 3) 50% of 500,000 gallon Section 8 storage Facility {.. $115,000 4 ) SuppleJental Transmission Pipeline froll Elairtown tj $138,000 Blairtown Tanks-4000'of 16" waterline at $ per ft. 5) Master Mete! Facility $35,000 6) Misc. JPiiB System A1tera~lons $35,000 Construction Ccst-Subtotal ' $2,134,000 Construction Engineering Costs (Subtotal tl X 10%) $213,400 Subtotal t2 $2,341 r400 Construction Contingency (Subtotal 12 X 15%) $352,110 Construction and Non-Construction Totals $2,699,510 $185 rood Project Cost Total (Cons:. Total + Non-Const. Total).... :...!$~,!~ ~!.i~.~~!!!,.':

14 Table ES-3 construction Cost Breakdown SF Phosphates JPWB Supply Alternative (Series Pump Station Scenario) Work te!l! Canst. tems Non-COns\. teills Preparation of flnal Designs and Specifications Permitting and Litigation Legal Fees Aquisition of Access and Right-of-Way Project Components 1) 25!300 feet Bn waterline at $37.00 per foot 2) 5700 feet 16 n waterline at $34.00 per faa: 3) Bltn. Tanks Pump Station HP pumps, 1150 gpm! 200' TDH 4) Section 5 Pump Station HP pumps, 1750 gpm, 400' TDH 5) 50% of 5000,000 gallon Section 8 Storage Facility 2 6) Supplemental Transmission Pipeline from Blairtown to Blairtown Tanks-4000'of 16 n waterline at $34.50 per ft. 7) Master Meter Facility S) Misc. JPWB System Alterations Construction Cost-Subtotal 11 Construction Engineering Costs (Subtotal 11! 10%) subtotal 12 Construction Contingenc7 Subtotal 12! 15%1 Construction and Non-Construction To:als Project Cost Total (Canst. Total + Non-Canst. Total) $973,100 $193,800 $ $450! 000 $175,000 $138,000 $35,000 $35,000 $2,299,900 $229,990 t2,529!s90 $379,484 $150,000 $10,000 $5,000 $25,000 $2,909,374 $190,000 ~ ~ _ _ 4 _ _...,... "... _-... _... "."... ".... ~:~ ~~ij: =finri )jjf~> :: i:i i~~}~t?t~rli:)

15 .,... >.>.. " ~ ~... "-., > ~.~- ~,~ - -. Table ES-4 construction cost Breakdown Arrowhead Springs Groundwater Supply Alternative Work tem WWDC Const. tems Eligible Non-Const. tems me neligible Preparation of Final Designs and Specifications $45:000 Permitting and Litigation $5,000 Legal Fees $3,000 Aquisition of Access and Right-of-Way $2~,OOO Project Components 1) Level Test Well (incl. eng., drilling, test) $71,6BO 21 75,000 gallon storage $:.25 per gallon $93,750 3) 5700' of 8~ waterline to $18.00 per foot $ ) Control and electrical to off-site tank $i, Level completion c~sts: Well Pump (150 gpm,15h.p! Pitless adapter unit PumphODse/Control Buildinglliberglass) Chlorinator 6' Pipeline froll well (2000' at $15.00 per foot) Blcwoffs AVAR, etc. 6) Distribution systelll (incl. eng. and contingency) construction Cost-Subtotal '1 Construction Engineering Costs (Subtotal il X 10%) subtotal #2 construction Contingency (Subtotal,2! 15%) construction and Non-Construction Totals Project Cost Total iidc Eligible (Const. Total + Non Const. Total) t?roject Cost Total WWDC neligible $6,500 $4,000 $30,000 $8,000 $302,350 $30,235 $332,585 $49, ,4B $144, " *,.. ~,*,~. ',~.~."'.~ -. * ,. -,-.- $4,500 $128,160

16 Table ES-S construction Cost Breakdown Arrowhead Springs JPWB Supply Alternative (8" Transmission Line) \lark tem WWDC Eligible Const. tems Non-Const. tems Preparation of Final Designs and Specifications $35,000 Permitting and Litigaton $5,000 Legal Fees $3,000 Aquisition of Access and Right-of-Way $12,500 Project Components 1) 13,500 feet gn waterlir.e at $18.00 per foot $243,000 "WDC neligible 2) Chloramine Re-disinfection facility $35,000 3) Master meter facility $7,500 4) Distribution System (incl. eng. and contingency) $111,960 construction Cost-Subtotal 11 $250,500 construction Engineering Costs (Subtotal 11 X 10\) $25,050 subtotal 12 $275,550 construction Contingency (Subtotal 12 X 15%) $41,333 Construction and Non-Construction Totals $316,B83 $55,500 Project Cost Total WWDC Eligible (canst. Total + Ncn-Canst. Total) ':::::::::::::::~:::::::::::;:'?:1n::::::?8' :f)::::::::::::::::::::::::::- :~~~:~~:~:::~=:~::;::::~~:t~1::q:...:g::::::/::::::::h:::.:...._..._ Project Cost Total WWDC neligible $

17 Table ES-6 construction cost Breakdown Arrowhead Springs JPWB Supply Alternative (10" Transmission Line) ~crk tell! Preparation of Final Designs and Specificatons Permitting and Litigation Legal Fees Aquisition of Access and Right-of-Way Project Components 1) 13,500 feet lon waterline at $23.00 per foot 2) Chloramne Re-disinfectlon facility 3) Master meter facility 41 Distribution System (incl. eng. and contingency)!iwdc Eligible WWDC nt-----r----- eligible Const. :ems Non-Const. tems $40,000 55,000 $3,000 $12,500 $310, ,000 $10,000 $117,960 Construction Cost-Subtotal ' Construction Engineering Costs (Subtotal i1 X 10%) subtotal 12 Construction Contingency (Subtotal 12 X 15%) ConstrUC:lon and Non-Constructlon Totals Project Cost Total WiDe!liglble (Const. To:al + Non Const. Total) PrOject Cost Total WftDC nelig:ble $320,500 $32,050 $352,550 $52,883 $405, _ _... _._... _ $ _ ".".. "._-.- ~</::.:::::+\ ::.. ::.::.;:l::. :::. :.:::::::~~:~+:-::::::.: _....

18 Table ES-7 Construction Cost Breakdown Airport Facility Groundwater Supply Alternative Work tem Preparation of Final Designs and Specifications Permitting and Litigation Legal Fees Aquisition of Access and Right-of-Way Project Components 1) Level Test Well (incl. eng., drilling, test) 2} Appurtenant Construction Costs Well PU3P 110 gpm. 3 H.P.) and Pitless Adapter Telemetry and Control Facility Power to Site 2 n pipeline froll well 17,500 $10.00 per ft. Softening and Reverse OSJosis Unit (Assumes utilization of an existing building at Airport) Chlorinator Pressure Tank and Murphy Switch Miscellaneous Apparatus WWDC Eligible Const. Non-Const. tels tems $25,000 $5,000 $3,000 $20,000 $43,448 $2 r 500 $15,000 $5,000 $175,000 $1,500 $5,000 WWDC neligible $40,000 $1,500 Construction Cost-Subtotal #1 Construction Engineering Costs (Subtotal X 10%j Subtotal 12 Construction Contingency (Subtotal #2 X 15%) Construction and Non-Construction Totals Project Cost Total WWDC Eligible (Const. Total + Non Canst. Total) Project Cost Total WiDC neligible $204,000 $20,400 $224,400 $258,060 $96,448., _ _~... 0_." ~.._..._ ",~ -" #>_*._ $41,500

19 Table ES-8 construction cost Breakdown Airport Facility JPWB Supply Alternative (10" Transmission Line) Work tem Preparation of Final Designs and Specifications Permitting and Litigation Legal Fees Aquisition of Access and Right-of-Way Project Components 1) 39,000 feet 10" waterline at $24.00 per foot 2) Chloramine Re-disinfection Facility 3) Master Meter Facility 4) Filter and Re-chlorination Facility at Airport. (Assumes utilization of an existing building at Airport) WWDC Eligible WiDC n ~ f eligible Const. tems Non-Const. tems $100,000 $5,000 $5,000 ~36,000 $936,000 $35,000 $10,000 $7,500 Construction Cost-Subtotal 11 Const:uction Engineering costs (Subtotal il X 10%) subtotal 12 Construction Contingency (Subtotal 12 X 15%) Construction and Non-Construction Totals Project Cost Total WiDC Eligible (Const. Total + Non Const. Total) Project Cost Total WiDe neligible $946,000 $94,600 $1,040,600 $156,090 $1,196,690 $146,000, _... _... _..._ $42.500

20 Table ES-9 construction cost Breakdown Airport Facility JPWB Supply Alternative (12" Transmission Line) Work tem Preparation of Final Designs and Specifications Permitting and Litigation Legal Fees Aquisitian of Access and Right-of-Way Project components 1) 39,000 feet 12" waterline at $29.00 per foot 2) Chloramine Re-disinfection Facility 3) Kaster Meter Facility 4) Filter and Re-chlorination Facility at Airport. (Assumes utilization of an existing building at Airport) WWDC Eligible WWDC nt------y eligible Const. tems Non-const. tems $110,000 $5,000 $5,000 $36,000 $1,131,000 $35,000 $12,000 $7,500 Construction Cost-Subtotal tl Construction Engineering Costs (Subtotal #1! 10%) subtotal,2 Construction Contingency (Subtotal,2 X 15%) Construction and Non-Construction Totals Project Cost Total WWDC Eligible (Const. Total + Non Const. Total) Project Cost Total WWDC neligible $1,143,000 $114,300 $1,257,300 $188,595 $1,445,895 $156, $ _.. _-._ , ' _,.._..._... ~~~j::~:;:::~:~:~:::...:...,::...::... ~... :1::..~::.:::.. :::~~~~::~.::~:~~::::::: -..., "..,..._... $42,500

21 Table ES-10 Construction Cost Breakdown Airport Facility JPWB Supply Alternative (14" Transmission Line) Work tell Preparation of Final Designs and Specifications Permitting and Litigation Legal Fees Aquisition of Access and Right-of-Way Project COJponents 1) 39,000 feet 14ft waterline at $33.50 per foot 2) Chloramine Re-disinfection Facility 3) Master Meter Facility 4) Filter and Re-chlorination Facility at Airport. (Assumes utilization of an existing building at Airport. ) WWDC Eligible Canst. Non-Canst. tems tems $5,000 $5,000 $36,000 $1,306,500 $15,000 tiwdc neligible $35,000 $7,500 Construction Cost-Subtotal 11 Construction Engineering Costs (Subtotal tl 10%) Subtotal #2 Construction Contingency (Subtotal #2 15%) Construction and Non-Construction Totals PrOject Cost Total WiDe Eligible (Canst. Total + Non Canst. Total) Project Cost Total WiDC neligible $1,321,500 $132,150 $1,453,650 $218,048 $1,671,698 $171,000..._.._..., _ _..... :;::;~. ~ -:; ~:$;~;84.2 ~;698: : :::;;: ;;::::: ::: _._.... _ $42,500

22 Table ES-11 Ability to Pay Analysis SF Phosphates JPWB Supply Alternative tem Per Month Cost Monthly cost of Water-Assume $1.50 per 1000 gallons. 1 Assume consump- $194,400 tion rate of 3000 gpm continuous flow. (129,600,000 gallons per month.) Purchase of 4839 acre-feet per year from iide (Fontenelle Storage~ at $18,146 assumed rate of $45.00 per acre-foot per year:$217,755 per year. ~ Total Monthly cost $212,546 Notes: 1. $1.50 per 1000 gallons based on best available projection of JPWB water costs in year 2000, including debt costs for new water treatment plant. Assumes 1% per year revenue growth from See Section of report.

23 Table ES-12 Ability-To-Pay Summary Arrowhead Springs and Airport Facility Arrowhead Springs Phase Alternati ve 1. Groundwater Supply Alternative 2. JPWB Supply Alternative-8" Transmission Line to Site 3. JPWB Supply Alternative-lO" Transmission Line to Site Est. Cost/Mth. $85 $88 $96 Rock-Springs sweetwater County Airport Alternative 1. Groundwater supply Alternative 2. JPWB Supply Alternative-lO" Transmission Line to Site 3. JPWB Supply Alternative-12" Transmission Line to Site 4. JPWB Supply Alternative-14" Transmission Line to Site Est. Cost/Mth. $897 $2,947 $3,360 $3,742