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SHOSHONE MUNICIPAL WATER SUPPLY ~OINT POWERS BOARD

LEVEL III INTERIIV! REPDRT

EXECUTIVE SUMMARY

SHOSHONE MUNICIPAL WATER SUPPLY PRO~ECT

DECEMBER 1986

FRANNIE

PACPC•• D .HC.HCN. MUNICIPAL PIP.LIN.

PACPC•• D AAW WAT.A .UPPLV PIP.LIN.

PAOPO•• D WATER ...------TREATMENT PLANT

BUFFALO BILL RESERVOIR

------BANNER ----- USEFUL CONVERSION FACTORS

1 cubic foot/second (cfs] ...... 448.8 gallons/minute (gpm] 1 cfs ...... 0.646 million gallons/day (MGD] For 24 hours ...... 1.983 acre-feet For 30 days ...... 59.5 acre-feet For 1 year ...... 724 acre-feet 1 MGD ...... 694 gpm 1 MGD...... 1.55 cfs For 24 hours ...... 3.07 acre-feet For 30 days ...... 92.1 acre-feet For 1 year...... 1. 1 20 acre-feet 1.000 gpm ...... 2.23 cfs 1.000 gpm ...... 1 .44 MGD For 24 hours ...... 4.42 acre-feet For 30 days ...... 132.5 acre-feet For 1 year ...... 1 61 3 acre-feet 1 acre-foot ...... 43.560 cubic feet 1 acre-foot ...... 325.829 gallons \..1 acre ...... 43.560 square feet

Prime Consultant: 8anner Associates. Inc. 620 Plaza Court P.O. 80x 550 Laramie, WY 82070 [307] 745-7366

Subcansultants: Engineering Associates P.O. 80x 1900 Cody. WY 82414 [307] 587-4911

Chen & Associates. Inc. 605 North Warehouse Road Casper. Wy 82601 [307] 234-2126

Engineering and Operations. Inc. 1513 Symons Laramie. Wy 82070 [307] 742-3432 SHOSHONE MUNICIPAL WATER SUPPLY ~OINT POWERS BOARD

MEMBERS:

Dorse Miller • .Jr.• Chairman .John Nickle. Vice-Chairman Lloyd Snyder. Secretary-Treasurer Bryan Lee Alan Bair Hiram Beaver Chester Blackburn

FUNDING ASSISTANCE PROVIDED BY:

Wyoming Farm Loan Board Wyoming Water Development Commission LEVEL III - EXECUTIVE SUMMARY

SHOSHONE MUNICIPAL WATER SUPPLY PRO~ECT

1.0 INTRODUCTION 1.1 Project Authorization .1 1.2 Other Level III Reports . .1 1.3 Project Scope...... 1 1.4 Project Setting ...... 2

2.0 POPULATION AND WATER NEEDS PRO~ECTIONS 2.1 Population Projections .. .2 2.2 Water Need Projections. .3

3.0 PRO~ECT DESCRIPTION AND RECOMMENDATIONS 3.1 Shoshone Municipal Water Treatment Plant. .4 3.2 Shoshone Municipal Water Supply Pipelines .4 3.2.1 Raw Water Supply Pipeline . .S 3.2.2 Shoshone Municipal Pipeline .7

4.0 COST ESTIMATES ...... 8

5.0 PERMITS AND LAND ACQUISITION 5.1 Permits ...... 9 5.2 Land AcqUisition and Easements ...... 10

PLATES Area Map Water Treatment Plant Architectural Drawing

------BANNER--- ____ _ MONTANA t--~- - ..J10NTANA R 99 W PARK COUNTY R 98 W R 97 W R 96 W BIG HORN R 95 W I PROJECT COUNTY T 58 N SHOSHONE . ~~~~ MUNICIPAL PIPELINE ·· ~~~~~~~~~~~~~~~~ I t- AREA DEAVER /FRAN NI E SPUR

T 57 N

CJ :::I: <. Cl

I r SHOSHONE MUNICIPAL PIPELINE

T 55 N

N -----1------< SHOSHONE 1, NATIONAL I I FOREST~ T 54 N r--I I SHoSHoNE RAW >- ~ WATER SUPPLy --~--~~~~------IT~------~------L------~ 5 ____ ~--~---- PIPELINE BOOSTER g ~ SCALE: 1" = APPROX. 4 MI. -T-BUREC PUMP STATION LJ I :z MAP SOURCE: AMS SPIRIT MOUNTAIN SHOSHONE ~ :3 ENERGY DISSIPATION MUNICIPAL PIPELINE ~ ~ T 53 N STRUCTURE ~

T 52 N RAW WATER PUMP STATION PROPOSED WATER TREATMENT PLANT RESERVOIR I I ------BANNER-- 1.0 INTRODUCTION

1.1 Project Authorization

The Wyoming Legislature authorized the Wyoming Water Development Commission to conduct a Level III Development Plan for the Shoshone Municipal Pipeline Project. The Commission elected to contract with the Shoshone Municipal Water Supply .Joint Powers Soard to proceed with development of the final project configuration. budget and schedule.

The .Joint Powers Soard subsequently entered into a contract with Sanner Associates. Inc .. of Laramie. Wyoming. to provide engineering services for this pipeline project. Additionally. the .Joint Powers Soard received funding from the Wyoming Farm Loan Soard to conduct a Level III conceptual plan for the Shoshone Municipal Water Treatment Plant. Sanner was given the assignment to perform the engineering studies and prepare the conceptual design for the water treatment plant.

1.2 Other Level III Reports

This report is an executive summary of the two interim reports prepared to document the results of the Level III Development Plan. The two reports are entitled: Level III Interim Report Shoshone Municipal Water Supply Pipelines [Sanner. 1986] -this report addresses the raw water supply system and the treated water delivery pipelines: and Level III Interim Report Shoshone Municipal Water Treatment Plant [Sanner, 1986] -this report provides details regarding the conceptual design of the water treatment plant.

1.3 Project Scope

The Shoshone Municipal Water Supply Project is a regional water development project proposed to meet the water needs of municipalities and rural water users in northwest Wyoming through the year 2030. Communities participating in this project include Cody. Powell. Syron. Lovell. Deaver. and Frannie. Potential rural water users are located in the unincorporated areas of Park and Sig Horn Counties adjacent to the proposed pipeline route.

The major components of the Shoshone Municipal Water Supply Project include: • A raw water supply system to deliver water from Suffalo Sill Reservoir and the to the water treatment plant: • A water treatment plant located west of. Cody; • A treated water delivery pipeline to convey water from the water treatment plant to participating communities and rural water users situated along the pipeline route.

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------BANNER--- 1.4 Project Setting

The Shoshone Municipal Water Supply Project is located in the Sig Horn Sasin of northwest Wyoming. A map showing the project area and the location of proposed facilities is attached as a frontpiece to this executive summary. The raw water supply system extends from Suffalo Sill Dam to the water treatment plant located west of Cody. The treated water delivery pipeline extends from the water treatment plant to Lovell. A spur pipeline extends from the main pipeline north to Deaver and Frannie.

2.0 POPULATION AND WATER NEEDS PRO-JECTIONS

2.1 Population Projectiona

The population to be served by the project was projected to the year 2030. Population projections provide design criteria for determination of pipeline and water treatment plant capacity. The water service populations were based upon the most recent revision of the Wyoming Population and Employment Forecast Report [OAFC. 1980; revised. 1985]. review of the Level I and II reports. and input from the .Joint Powers Soard. The water service population pr"ojections are detailed in Table 1.

TABLE 1. SHOSHONE MUNICIPAL WATER SUPPLY PRO.JECT POPULATION PRO.JECTIONS

1990 2000 2010 2020 2030

Cody 9,700 12.300 15.000 17.500 20.000 Cody Rural 520 600· 700 780 870 Ralston 110 120 130 150 160 Powell West Rural 1.115 1.280 1.475 1.700 1.940 Powell 6.200 7.200 8.100 9.000 10.000 Powell East Rural 610 710 800 890 1,000 Syron 800 980 1,190 1.450 1,770 Lovell Rural 520 600 700 780 870 Lovell 3.000 3.210 3,430 3.670 3,930 Deaver 260 300 340 400 450 Deaver Rural 110 120 130 150 160 Frannie 160 170 180 190 200

Total 23,105 27,590 32,175 3S,SSO 41,350

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------BANNER--- 2.2 Watar Need Projectiona

Each community's historic water use patterns were evaluated where this information was available. Sased upon this evaluation, design water need factors were developed for each entity. Water consumption varies significantly with the seasons. day of the week. and time of day. Therefore. allowance was made to consider these variations. The design factor used to size project facilities was the peak day demand. The peak day demand is a per capita figure used to estimate future water needs based upon population projections. Projected water needs are tabulated in Table 2.

TABLE 2. PRO.JECTEC WATER NEECS FOR THE SHOSHONE MUNICIPAL WATER SUPPLY PRO.JECT [in million gallon a par day - MGC]

Pe.k c.y C.",.nd GPCPC1 1990 2000 2010 2020 2030

Cody a 434 .59 1.72 2.89 3.97 5.06 Cody:3 315 3.06 3.88 4.73 5.51 6.30 Cody Rural 425 .22 .26 .30 .33 37 Ralston 425 .05 .05 .06 .06 .07 Powell West Rural 425 .47 .54 .63 .72 .82 Powell 495 3.07 3.56 4.01 4.46 4.95 Powell East Rural 425 .26 .30 .34 .38 .43 8yron 510 .41 .50 .61 .74 .90 Lovell Rural 425 .22 .26 .30 .33 .37 Lovell 443 1.33 1.42 1.52 1.63 1.74 Deaver 510 .13 .15 .17 .20 .23 Deaver Rural 425 .05 .05 .06 .06 .07 Frannie 510 .08 .09 .09 .10 .10 --- Total 9.94 12.7B 15.71 1B.49 21.41

Gallons per capita per day. a Potable water to meet Cody's additional irrigation needs. Cody's existing non-potable water system will continue to supply Cody's current non-pGJtable water users with an irrigation water supply. :3 Potable water to meet Cody's potable water needs.

-3------BANNER--- The Shoshone Municipal Water Supply Project is sized to deliver and treat water at a rate that satisfies the peak day demand for all .Joint Powers Board entities simultaneously. The raw water and treated water delivery pipelines are sized to meet the peak day demands estimated for the year 2030. The water treatment plant. however. is sized to have an initial capacity less than the full design capacity. The water treatment plant will be constructed to have the capability to allow future expansion to the needed capacity projected to the year

2030.

3.0 PRO.JECT DESCRIPTION AND RECOMMENDATIONS

3.1 Shoahone Municipal Water Treatment Plant

The water treatment plant proposed for the Shoshone Municipal Water Supply Project is a conventional plant consisting of the major process components of chemical pretreatment. flocculation. sedimentation. filtration and disinfection. This conceptual design was established following an evaluation of Buffalo Bill Reservoir and Shoshone River water quality characteristics. An architectural drawing of the proposed water treatment plant is shown on the following page.

The water quality evaluation included a review of existing data. the collection and analysis of new water samples. bench scale jar testing. and a pilot treatment plant program. Additional pilot plant testing will be accomplished during the final design of the water treatment plant.

Key criteria adopted in developing the conceptual design of the plant included the standards for drinking water set forth in the Federal Safe Drinking Water Act (SDWA] and the 19B6 amendments to the Act, and the construction standards of the Water Quality Division of the Department of Environmental Quality of the State of Wyoming. Other criteria adopted were cost effectiveness and operational flexibility.

The water treatment plant will be constructed to an initial production capacity of 16.5 MGD. The projected water needs shown in Table 2 indicate that this initial capacity will be adequate to about the year 2010. At that time, the addition of a fourth flocculation chamber, a fourth sedimentation basin, the filter material and equipment in the fourth filter, and minor modifications will be required to increase the capacity to 22.0 MGD.

3.2 Shoahone Municipal Water Supply Pipelinea

The Shoshone Municipal Water Supply Pipeline consists of two separate pipelines: a pipeline to deliver a raw water suppply from Buffalo Bill Reservoir and the Shoshone River to the water treatment plant; and a pipeline to deliver treated water to .Joint Powers Board entities.

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------BANNER--- BANNER----- The design criteria used to size the pipelines was the peak day demand as shown in Table 2. The pipelines were sized to deliver the cumulative peak day demand to all ..Joint Powers Board entities simultaneously.

3.2.1 Shoehone Raw Water Supply Pipeline

The recommended raw water supply system involves the construction of a 36-inch diameter pipeline from an outlet facility at , throuqh the Shoshone Canyon, to a water treatment plant located west of Cody. The raw water supply pipeline was designed to deliver the cumulative peak day demand of 21.41 MGD [33.1 cfs]. The pipeline, as proposed, will tap into the Bureau of Reclamation [BuRec] Spirit Mountain Energy Dissipation Structure. Water supply availability at the proposed tap at the Spirit Mountain Energy Dissipation Structure should be highly reliable. BuRec personnel indicate an annual facility shutdown for inspection and maintenance would interrupt raw water supply for approximately one to two weeks during the winter.

The 36-inch diameter pipeline crosses the Shoshone River at the new BuRec bridge and will be constructed in the old highway. The pipeline will again cross the Shoshone River near the

Hayden Arch bridge, follow State Highway 16-14-20 east ~o the mouth of the Shoshone Canyon, and continue on to the Shoshone Municipal Water Treatment Plant. The Shoshone Raw Water Supply Pipeline, as proposed, is approximately 3.7 miles long.

The raw water supply system will normally flow under gravity conditions when the enlarged Buffalo Bill Reservoir is above average pool level, regardless of demand. Discharge by gravity is still possible at lower pool levels, but at rates less than the design flow. During periods of high water demand, low Buffalo Bill Reservoir levels, or a combination of both conditions, booster pumping will be required to deliver water to the water treatment plant. A booster pump station will be located near the mouth of Shoshone Canyon.

The raw water supply system will contain an emergency raw water pump station located immediately upstream of the Hayden Arch bridge. The emergency raw water pump station will provide raw water from the Shoshone River to the water treatment plant in the event of a scheduled or emergency interruption of raw water supply from the Shoshone Canyon Conduit.

The emergency raw water pumping station is sized to meet the average day demand of ..Joint Powers Board entities that do not have an emergency backup supply. The emergency raw water pumping station is sized to deliver 3.82 MG'D [5.9 cfs] to the water treatment plant. The emergency raw water pumping station is intended, primarily, to deliver raw water during scheduled annual maintenance periods. Water use would have to be curtailed if emergency pumping is required during periods of peak water demand.

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------BANNER--~ 3.2.2 Shaahane Municipal Pipeline

The Shoshone Municipal Pipeline will deliver treated water from the water treatment plant to .Joint Powers Board entities under gravity flow conditions. The pipeline will extend east from the water treatment plant to deliver water to the communities of Cody. Powell. Byron. and Lovell. A spur pipeline will also deliver water to Deaver and Frannie. Rural water users along the pipeline route may also be served by the Shoshone Municipal Pipeline.

The majority of the pipeline alignment will be located within existing Wyoming State Highway Department rights-of-way or easements. Pipeline sizes range from 38-inch to 8-inch diameter pipe. In all. the Shoshone Municipal Pipeline is approximately 87.8 miles in length. The length and size of the segments of the Shoshone Municipal Pipeline are listed in Table 3.

TABLE 3. SHOSHONE MUNICIPAL PIPELINE STATISTICS

Pipeline Ciameter Pipeline Length Pipeline Segment (inchee] (milee]

Water Treatment Plant to Cody 38 3.3 Cody to Powell 24 23.8 Powell to Garland 18 8.2 Garland to Byron 18 12.4 Byron to Lovell 14 8.0 Garland to Deaver 10 10.1 Deaver to Frannie 8 8.0

Tatal Pipeline Length 67.S milee

Pipe sizes were calculated assuming each community. or rural water district. would require the peak day demand simultaneously. Therefore. capacity to meet cumulative downstream peak day demands is provided at all points along the pipeline route. The design capacity of the pipeline leaving the water treatment plant is 21.41 MGD [33.1 cfs] and decreases downstream to account for projected deliveries to each .Joint Powers Board entity.

Each community's existing storage facilities were evaluated to determine adequacy to meet storage needs projected to the year 2000. Three components are included in the determination of storage needs:

• Operational storage to account for daily variation in community demand - equal to 25 percent of peak day demand; • Emergency storage to provide water supply in the event of service interruption -equal to 100 percent of peak day demand; • Fire storage to provide water for fire fighting - this is based on an evaluation of each community by the Insurance Services Office.

The evaluation indicated that new storage facilities are required for Byron. Deaver. and Frannie. The recommended storage facilities are required to enable the pipeline system to function as intended. The recommended storage facilities include a 400.000 gallon elevated tank for Byron. a 500.000 gallon ground level tank for Deaver. and a 40.0.000 gallon

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------BANNER--- elevated tank for Frannie. Byron's tank does not include capacity for emergency storage. Construction of facilities to meet water storage needs beyond the year 2000 is not included in this project.

Powell and Lovell have existing water supply systems that will be retained as an emergency backup. Additionally Lovell's pumping system at its existing water treatment plant will be retrofitted to allow pumping from Lovell to Byron for Byron's emergency water supply.

Other appurtenant facilities and design features included in the Shoshone Municipal Pipeline are:

• Pressure control stations to control excess pipeline pressure; • Pipeline corrosion protection measures; • Service connections to communities to deliver water into distribution systems, storage facilities, or both at existing system pressures; • Miscellaneous pipeline isolation valves, air release valves, air-vacuum valves, and blowoff valves.

Provisions for connection to rural water districts have not been considered at this time. No organized rural water district has committed to the ..Joint Powers Board for participation in the project at this writing.

4.0 COST ESTIMATES

Cost estimates for the water treatment plant, raw water supply system, and treated water delivery system were based on the conceptual designs prepared as part of this Level III analysis. The costs are based on the 19B7 level of construction prices. The estimated construction costs were used in developing a total estimated project budget for the water treatment plant and the pipelines. These budget estimates are shown on Table 4.

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------BANNER--- TABLE 4. SHOSHONE MUNICIPAL WATER SUPPLY PRO.JECT - BUDGET REGUIREMENTS

Water Treatment Item Plant Pipelinea Total

1987 Construction Cost $11,440,000 $27,590,000 $39,030,000 50/0 Escalation 572,000 1,380,000 1,952,000 1988 Construction Cost $1·2,012,000 $28,970,000 $40,982,000 Construction Contingency [15%] 1,802,000 4,346,000 6,148,000 Total 1988 Construction Cost Plus Contingency $13,814,000 $33,316,000 $47,130,000

Construction Engineering [100/0] $1,382,000 $3,332,000 $4,714,000 Legal &. Administrative [30/0] 415,000 1,000,000 1,415,000 Land Acquisition 150,000 90,000 240,000 Level III Engineeering 739,000 1,400,000 2,139,000

Total Funding Requirement $16,500,000 $39,13B,OOO $55,63B,OOO

5.0 PERMITS AND LAND ACQUISITION

5.1 Permits

Several permits, licenses, and authorizations are required for a water project of this magnitude. The respective construction contractors will be assigned the responsibility to secure variOUS construction oriented permits. Other permits requiring a long lead time and that deal with complex or sensitive issues will be secured by the .Joint Powers Board. The following is a list of permits and agencies through which the .Joint Powers Board will seek authorization to construct this project:

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------BANNER--- Permit Issuing Agency

Pipelines:

Dredge and Fill Permits [404] U.S. Army Corps of Engineers Nationwide Permits U.S. Army Corps of Engineers State Certification [401] Wyoming DEQ/WQD Archeological Clearance Wyoming State Historical Preservation Office Water Use Agreements &. Petitions Wyoming State Engineer Water Use Agreements Bureau of Reclamation Permit to Construct Wyoming DEQ/WQD Memorandum of Agreement

Water Treatment Plant:

Permit to Construct Wyoming DEQ/WQD Reservoir Permit Wyoming State Engineer

5.2 Land Acquisitian and Easemants

Construction of the Shoshone Municipal Water Project will require .Joint Powers Board acquisition of private lands and the authority to occupy existing easements or rights-of-way. Land requirements for the pipeline includes a 1 DO-foot temporary construction easement and a 3D-foot wide permanent easement. The majority of the pipeline construction. approximately 40.2 miles. will be constructed within existing Wyoming State Highway Department easements or rights-of-way. The remainder will occupy federal. municipal. or county rights-of-way or easements. and private land. The water treatment plant will be sited on private land.

-10------BANNER--- Table 5 is a summary of land ownership status and Shoshone Municipal Water Supply Project land requirements.

TABLE 5. SUMMARY OF LAND OWNERSHIP STATUS AND PRO.JECT REGUIREMENTS

Permanant Construction Langth Easement Easement Agency (Feet] (Acres] (Acres]

8ureau of Reclamation 10,800 7.44 24.79 Wyoming Highway Department 212.100 146.07 486.91 8urlington Northern Railroad 18,400 12.67 42.24 Park County 72,400 49.86 166.21 8ig Horn County 1.100 .76 2.53 E.E. Faust Regional Airport 8,600 5.92 19.74 City of Cody 7,900 5.44 18.14 City of Powell 200 .14 .46 Town of 8yron 6,100 4.20 14.00 Town of Lovell 200 .14 .46 Town of Deaver 200 .14 .46 Town of Frannie 3,100 2.13 7.12 Private - Pipelines 41,200 28.37 94.58 Private - Water Treatment Plant 28.00 28.00 Private - Access Road 5,000 9.00 17.00 Total 3B7,300 300.28 922.64

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------BANNER----