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James Town‐Rio VistaWater District

Keller Associates, Inc.9541 Highway 789Riverton, WY 82501307.240.1939

Project No. 208063‐000February 2010

Water Supply Level II Study – Executive Summary

Wyoming Water Development Commission


James Town/Rio-Vista Water District Water Supply Level II Study

208063-000 1 February 2010

Executive Summary

1.1 Existing Water System Overview Customers of the James Town/Rio Vista Water and Sewer District (District) receive domestic potable water from a water treatment, distribution, and storage system operated by the District. Due to the limited extent of the current distribution system, not all residents of the District are connected to the potable water system. All of the existing water system, with the exception of approximately 2,100 feet of 2 inch galvanized water line, was put into use in 1982. The District’s water supply is pumped from the Green River to a conventional surface water treatment plant. After treatment, water is distributed throughout the community via a pipe network consisting primarily o PVC water lines. The water system utilizes a 200,000 gallon steel storage reservoir and 30,000 gallon clear well for system storage.

1.2 Existing Facility Evaluation Several issues have been identified in regards to the current condition and operation of the District’s water system. Analysis of the system has also revealed future conditions that the existing system may encounter during future operations. Some of these issues are violations of the Safe Drinking Water Act or DEQ Water Quality Division Rules and Regulations. These issues are summarized as follows:

• Water storage reservoir is undersized to meet existing needs and regulatory requirements. The District needs a minimum of 490,000 gallons of storage to meet current regulatory requirements.

• The storage reservoir interior is in deteriorated condition. Results of a November 2008 inspection recommend that the reservoir be repainted in one to two years and that there is up to eight inches of sediment on the reservoir bottom.

• Two inch galvanized water mains are thin and difficult to repair. The operator has listed replacing these lines as one of the District’s top priorities.

• The water meters in the District are old and have not been maintained. Due to these circumstances, it is assumed that the meters do not provide accurate consumption information. As a result, monthly user billing may not be accurate.

• The water treatment plant does not have the capacity to meet future regulations and water demands.

• There is no redundancy at the water treatment plant. A contamination or equipment failure event would leave the District without potable water.

• The treatment plant electrical system is antiquated and has limited functionality. • Some treatment plant components are undersized or do not meet current sizing

regulations. • The water treatment plant has reached the end of its usable life. This is evidenced by the

extensive coating failure, operational challenges, and the time commitment required by the operator to operate the plant.

• The intake structure is not protected from River contamination or damage as a result of ice flows in the winter.



208063-000 2 February 2010

• Turbidity in the Green River can be in excess of 4,000 NTU, severely limiting treatment plant operation.

• The District‘s existing debt is approximately $1,086,000. At this time they are not paying enough to address the accruing interest, therefore they are not retiring the principal.

• The District is understaffed to operate the existing system. Keller Associates recommends that the District hire, at a minimum, one part-time operator if it continues to operate a water treatment plant in the future.

1.3 Projected Conditions As James Town grows, each new resident will bring an additional water demand. Future per capita demands represent existing per capita demands for general residential and commercial consumption. Table 1.1 reports the per capita demands for future residents of James Town. The future system demands are calculated by multiplying the per capita demand by the additional population over and above the existing population and adding the result to the existing total system demand for each demand scenario. Table 1.2 presents the projected system demands for the 5, 10, and 20-year planning windows.

Table 1.1 – Projected Per Capita Demands

Demand Scenario Future Unit Demands

(gpcd) Annual Average Day 201 Average Winter Day 123 Average Summer Day 343 Maximum Day 657 Peak Hour1 986

Table 1.2 – Projected Water Demands

Estimated Year Population

Average Winter

Demand (gpm)

Average Summer Demand

(gpm)

Max Day Demand

(gpm)

Peak Hour Demand

(gpm)

Annual Average

Day Demand

(gpm) 2015 648 83 228 417 626 135 2020 678 86 235 431 647 139 2030 702 89 241 442 663 142

Project Design 702 90 250 450 675 150

1.4 Water System Improvements Table 1.3 shows the system improvements that were considered to address the issues listed in Section 1.2. Detailed descriptions of the improvements are presented in Water Supply Level II

1 Based on an assumed Peak Hour Multiplier of 1.5



208063-000 3 February 2010

Study. The opinions of probable costs reflect conceptual level costs and are intended to assist in the planning and prioritization of improvements. Costs should be updated during pre-design and design of improvements.

Table 1.3 – Improvements Cost Summary

Alternative For Description Cost2 Water Supply Improvement 1 Toxic spill Intake Structure $1,619,000Water Supply Improvement 2 Toxic spill Treated Water Reservoir $1,785,000Water Supply Improvement 3 Toxic spill No Action $ 0Water Supply Improvement 4 High Turbidity Settling Basin $1,482,000

Water Supply Improvement 5 High Turbidity Increased Capacity Treatment Plant $2,500,000

Water Supply Improvement 6 High Turbidity Treated Water Reservoir $813,000Water Supply Improvement 7 High Turbidity No Action/Variance $0

Water Supply Improvement 8 Intake Damage Portable/Emergency Intake Pump $90,000

Water Treatment Improvement 2 Treatment Capacity Conventional Treatment $2,125,000Water Treatment Improvement 3 Treatment Capacity Membrane Treatment $2,732,000Water Treatment Improvement 4 Treatment Capacity Separate Irrigation System $3,230,000

Water Treatment Improvement 5A Treatment Capacity Regionalization – Highway Route $3,792,000

Water Treatment Improvement 5B Treatment Capacity Regionalization – River Crossing Route $2,050,000

Water Treatment Improvement 6 Treatment Capacity No Action $0

Storage Improvement 1 Storage Rehab Existing and Construct New $791,000

Storage Improvement 2 Storage Abandon Existing and Construct New $802,000

Distribution/Transmission Improvement 1A.1 Fire Protection Existing System Upgrades $516,000



Distribution/Transmission Improvement 1A.4.1 Fire Protection Existing System Upgrades $523,000

Distribution/Transmission Improvement 1A.4.2 Fire Protection Existing System Upgrades $539,000

Distribution/Transmission Improvement 1A.4.3 Fire Protection No Action $0

Distribution/Transmission Improvement 1B.1

System Improvement Replace Old Lines $210,000

Distribution/Transmission Improvement 1B.2

System Improvement Replace Undersized Lines $753,000

Distribution/Transmission Improvement 1C

System Improvement Loop Existing System $173,000

Table Continued on Next Page

2 In 2009 dollars



208063-000 4 February 2010

Alternative For Description Cost2 Distribution/Transmission Improvement 1D

System Improvement

Replace Existing Service Meters $1,138,000

Distribution/Transmission Improvement 2

Future Development

Future Development Transmission $1,741,000

1.5 Recommended System Improvements and Project Schedule Keller Associates recommends that the District proceed with connecting to the JPWB as the District’s source of water. By connecting to the JPWB, the District eliminates the need to address any water supply or treatment issues. Regionalization will be less expensive to the District residents than constructing a new conventional water treatment plant to replace the existing treatment system. When the cost to upgrade the raw water pumping system is added in, regionalization is significantly less expensive. Table 1.4 and Table 1.5 list the projects Keller Associates recommends that the District complete to maintain system viability and minimize financial burden to system customers. Table 1.6, Table 1.7, and Table 1.8 contain detailed costs estimates for each improvement and Figure 1.1 provides an overview of the proposed project locations. This improvement scenario assumes WWDC funding on all eligible portions of the project and zero grants on the portions not eligible for WWDC funding. These improvements eliminate the District’s need to upgrade and maintain the existing intake structure and water treatment plant. It also minimizes the District’s risk to high turbidity events and contamination of the River because the JPWB’s proposed upgrades (raw water storage reservoir) and the robustness of the JPWB water treatment plant. This improvement scenario focuses on paying off the District’s existing debt and minimizes the need to acquire additional debt or significantly increase user rates. Keller Associates recommends that the District establish a variable rate schedule similar to the current rate structure once the project funding package is identified. The rates presented only assume WWDC funding. It is likely that the District will be eligible for additional grants through USDA-Rural Utility Service, Community Development Block Grant, etc. Changes in the funding package can significantly change the rate structure. Due to the magnitude of the projects that have been identified and the outcome of the meeting that was held with the State Lands and Investment Board, a schedule is not feasible at this time. The first step of the process will be to approach the State legislature for relief of the existing debt. Once some measure of relief has been achieved then the District can begin to plan for the identified future projects. Due to the necessary political avenue of introducing a bill to the legislature and the need for significant public involvement a schedule has not been developed. The general approach to the solution should follow; legislative action, 1-2 years; public participation, 6 months to 1 year; project design 1-3 years (all recommended improvements); secure project funding, 6 months to 1 year; project construction, 6 months to 4 years (all recommended improvements). Thus the approximate time to complete the proposed projects is from 3.5 years to 11 years. This schedule can be significantly compressed once the legislative action is better understood.



208063-000 5 February 2010

Table 1.4 – Keller Associates Recommended Improvements Capital Cost

Cost WTI 5B – Regionalization River Crossing Route $2,050,000

WstorI 2 – Construct Reservoir $210,000Dist 1B.1 – Replace Old Lines $802,000Total Improvement Cost $3,062,000

Table 1.5 – Keller Associates Recommended Improvements Monthly User Rate

Item

Monthly User Rate w/ Existing

Loan

Monthly User Rate w/o

Existing Loan Existing Loan Payback $47.80 $0 Projected O&M $43.40 $43.40 WTI 5B – Regionalization River Crossing Route $22.90 $22.90

WstorI 2 – Construct Reservoir $8.10 $8.10 Dist 1B.1 – Replace Old Lines $6.40 $6.40 Water Purchase $26.30 $26.30 Capital Improvement Reserve $8.10 $8.10 Proposed Average Monthly Rate $163.00 $115.20 2.5% of Median Household Income divided by 12 months $70.30

Table 1.6 – Opinion of Probable Cost: Regionalization River Crossing Route

Design Phase Activities Cost Final Design and Specifications $131,000 Permitting and Mitigation $164,000 Legal Fees $33,000 Acquisition of Access and Rights of Way $82,000

Construction Phase Activities Cost of Project Components Regionalization – River Crossing Route

River Crossing $371,000 8” Pipeline (13,500 feet) $571,000 Meter/Check Valve $56,000 Valves $10,000 Meter Vault $17,000 Railroad Bore $63,000 Miscellaneous Repairs $31,000 Electrical $35,000 SCADA $21,000 Gravel Surface Restoration $15,000 Air Valve and Vault $11,000 PRV and Vault $15,000 Residential Connections $14,000 Maintenance Building $66,000

Table Continued on Next Page



208063-000 6 February 2010

Construction Cost Subtotal $1,296,000 Engineering Costs (10%) $130,000 Subtotal $1,426,000 Contingency (15%) $214,000

Construction Cost Total $1,640,000 Project Cost Total $2,050,000

2012 Project Cost Total (Inflation 5%) $2,381,000

Table 1.7 – Opinion of Probable Cost: Construct New 0.61 MG Reservoir

Item Description Cost Final Design and Specifications $55,000 Permitting and Mitigation $14,000 Legal Fees $14,000 Acquisition of Access and Rights of Way $34,000 Cost of Project Components Construct New Reservoir

Construct New 0.61 MG Reservoir $497,000 Abandon Existing Reservoir $35,000 Geotech Investigation $10,000

Construction Cost Subtotal $542,000 Engineering Costs (10%) $54,000 Subtotal $596,000 Contingency (15%) $89,000

Construction Cost Total $685,000 Project Cost Total $802,000

2012 Project Cost Total (Inflation 5%) $932,000

Table 1.8 – Opinion of Probable Cost: Replace Old Lines

Design Phase Activities Cost Final Design and Specifications $15,000 Permitting and Mitigation $3,000 Legal Fees $3,000 Acquisition of Access and Rights of Way $4,000

Construction Phase Activities Cost of Project Components 1B.1

8” Pipeline (2,100 feet) $89,000 Gravel Surface Restoration (Alley) $32,000 Gravel Surface Restoration $10,000 Valves $15,000

Construction Cost Subtotal $146,000 Engineering Costs (10%) $15,000 Subtotal $161,000 Contingency (15%) $24,000

Construction Cost Total $185,000 Project Cost Total $210,000

2012 Project Cost Total (Inflation 5%) $244,000

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CAD NAME: SCALE: (Based on 22"x34" sheet)

CHECKED:

APPROVED:DESIGNED:

PROJECT NO.

SHEET NO.NO. REVISIONS BY DATE

DRAWN:

WWDC 208063JAMES TOWN - RIO VISTAWYOMINGThis document or any part thereof in detail or design concept is the

personal property of Keller Associates, Inc. and shall not be copied in anyform without the written authorization of Keller Associates, Inc.

305 North 3rd Avenue, Suite APocatello, Idaho 83201

(208) 238-2146

3080

BRP

BRP

---

NTC

GLC

Keller Associates, Inc.9541 Highway 789Riverton, WY 82501307.240.1939