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EXECUTIVE SUMMARY BEDFORD WATER SUPPLY LEVEL I MASTER PLAN

Wyoming Water Development Commission

October 2019

EXECUTIVE SUMMARY BEDFORD WATER SUPPLY LEVEL I MASTER PLAN

Wyoming Water Development Commission

October 2019

Benjamin J. Jordan, P.G. State of Wyoming, No. 3458

GROUNDWATER. ? ENGINEERING

1050 N. 3rd St. Suite E Larami e, WY 82072 westonengineerin 1-307-745-6118

Robert V. Hood, P.E. State of Wyoming, No. 11066

l:J SUNRISE

'

'

P.O. Box 609 47 E. 4th Ave. Afton, WY 83110 sunrise- 1-3 07 - 885- 8500

EXECUTIVE SUMMARY

1.0 INTRODUCTION

The Greater Bedford Water and Sewer District initiated this study to evaluate the water system and to prepare a master water plan to guide future maintenance, operation, and improvements. The study was funded by the Wyoming Water Development Commission (WWDC) and prepared by Sunrise Engineering, Inc. of Afton, Wyoming.

The Bedford District located in the Star Valley in western Wyoming serves approximately 300 water users (see Figure 1). The system utilizes the "Big Spring" located in Strawberry Canyon as the primary water source and the "Bedford Well No. 1" is used to supplement flow during low water years. Recent improvements to the system include a larger well pump and automation of the well in 2009, a new 525,000 gallon storage tank in 2010 in Strawberry Canyon, and new radio read water meters in 2016.

Figure 1 - Greater Bedford Water and Sewer District, Lincoln County, Wyoming

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2.0 INFORMATION REVIEW

This section is a review of existing information from past relevant studies, other documents available from the sponsor, and county data (development plans, zoning ordinance, etc.). It also contains a discussion of recommended improvements in previous studies and, if the improvements have been implemented.

Existing information gathered and reviewed during this Study included the following documents:

1. The funding application submitted by the sponsor, WWDO Bedford Water Supply Level I Final Report 1986Forsgren-Perkins Engineering

2. WWDO Bedford Water Supply Level II Final Report 1987-Forsgren-Perkins Engineering 3. WWDO Thayne Area Water Supply Level I Study 1995-Forsgren and Associates 4. WWDO Star Valley Master Plan, Bedford Summary-2009 Sunrise Engineering 5. Lincoln County Land Use Regulations 6. Proposed Bedford Water Supply Improvements Design Engineering Report, October 2008 Forsgren Associates

3.0 INVENTORY, EVALUATION, AND GIS

A thorough review of the design drawings from the various projects that constructed the system was completed to verify and proof the existing GIS mapping and to make an inventory of the system. Major system components were also visited on the ground and evaluated in the field.

The major system components were also evaluated for condition, capacity, and the ability to meet the needs of the District in future years. Wyoming Department of Environmental Quality (DEQ) rules and regulations were used as the standards for the evaluations.

Source

The Bedford water system has two active sources; Big Spring located in Strawberry Canyon and the Bedford Well No. 1 located west of the townsite. The District also has the Spring No. 1 also located in Strawberry Canyon, but Spring No. 1 is not being used. The system has excess source capacity of 1,452 gallons per minute (gpm) as shown in Table 1.

Table 1 - Water Source Capacity Compared to Maximum Day Demand

Big Spring Capacity +Bedford Well No. 1 -Maximum Daily Demand (2048)

Excess capacity =

2,111,000 gpd 1,008,000 gpd 1,029,000 gpd 2,090,000 gpd

1466 gpm 700 gpm 714 gpm 1452 gpm

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Water Treatment

The Bedford system has the ability to add chlorine to the water to each source using a gaseous chlorine system located mouth of Strawberry Canyon (for Big Spring water), and a sodium hypochlorite system located in the well house (for Well #1 water).

Transmission and Distribution Lines

A major construction project in 1989 (funded by WWDC) installed approximately 20,000 lineal feet of new 10-inch diameter ductile iron transmission line from Big Spring to Town. The pipeline capacity, as measured with a portable flow meter as part of this study, is 1,466 gpm.

The distribution piping in the Bedford system consists of pipe sizes of 2", 3", 4", 6" and 8" diameter. Much of the distribution pipe was installed during the construction project in 1990 (funded by WWDC). The pipeline material in the system consists of Ductile Iron, PVC, and some HDPE.

The elevation differential across the Bedford distribution system is approximately 500 feet with land sloping from the toe of the east mountains to the center of the valley to the west, so several Pressure Reducing Valves (PRVs) are present in the system ranging in size from 2-inch to 8-inch. The PRVs are located in manholes (2-inch and 4-inch) or larger rectangular concrete vaults (6-inch and 8-inch).

Water Storage

Water storage in the Bedford system consists of a 525,000 gallon steel tank constructed in 2009 and located in Strawberry Canyon. The tank is an Aquastore glass fused to steel bolted tank. This tank type was recommended during a system design report in 2008 to allow vertical expansion for future needs without the environmental impacts in the canyon. The tank is expandable to 1,000,000 gallons by adding rings to the existing structure. The water tank has capacity to meet current demands and the projected future demands over the next 30 years.

Table 2 - WYDEQ Storage Requirement with Fire Flow

Existing

Projected 2048

25% Max. Daily Demand

224,000

302,000

+ Fire Protection -Storage Capacity

180,000 525,000

180,000 525,000

Excess Storage

121,000

43,000

Repair and Replacement of Existing Components

Below is summary of the major components of the Bedford system along with their installation year, estimated useful life, and the anticipated year of repair and replacement. Shaded cells indicate that the component will need attention within the next 20 years.

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Table 3 - Water System Components Estimated Useful Life

Ductile Iron Pipe PVC Pipe HDPE Pipe Mainline Valves Fire Hydrants PRV Valves and Appurtenances Master Meter Big Spring Lining and Piping Well Pump and Equipment Water Tank Water Tank Exterior Coating Water Meters Water Meter Encoders/Batteries Water Meter Pits Chlorination Equipment (Spring) Chlorination Equipment (Well) SCADA Equipment

Installation Date 1990

1990-2017 2010

1990-2017 1990-2012

1990 1990 1990 2012 2012 2012 2017 2017 1990 2018 2012 2012

Expected Useful Life (years) 100 80 80 50 50 30 10 60 30 50 20 10 20 30 20 20 20

Estimated Repair or Replacement

Date 2090 2070 2090 2040 2040 2020 2000 2050 2042 2062 2032 2027 2037 2020 2038 2032 2032

Estimated Repair or Replacement Cost

(2019 $) $45-$70/ft $45-$70/ft $45-$70/ft $1,500 - $2,500 each $6,500 each $8,000 to $22,500

$4,000 $100,000 $50,000 $750,000 $65,000 $75 each $75 each $1,500 each $10,000 $3,000 $30,000

System Management and Operation

The Bedford Water and Sewer District has an elected board consisting of five members. They hold a board meeting on the first Thursday of each month. The District does not have any employees; they use a contract water operator and contract bookkeeper. The system is well managed, maintained and operated.

GIS

The Bedford System has an existing GIS that is hosted in the cloud (Sunrise Cloud SMART GIS). For this project the GIS was proofed and edited as part of the inventory and evaluation process. A large format GIS map of the system is being provided to the project sponsor as part of the project deliverable.

4.0 HYDRAULIC MODEL

The capacity of the Bedford transmission and distribution system was examined using a water model. The water model software (H2O Net) analyzes the ability of the system to perform based on its given pipe sizes, pipe lengths, system elevations, tank locations, and pipe configurations. The program models various demand scenarios that the system may be required to meet.

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To calibrate the model, actual system pressures measured at PRV vaults were compared to modeled pressures. The pressure compared very well. Fire hydrant flow tests were also performed to compare actual flows in the system to modeled flows. The results show that for four of the seven tests, the model reflects the actual results very well. However, for three of the tests, the results were not acceptable as a sufficient calibration to the model. It was determined that the most likely reason for the incorrect modeled fire flows versus that measurements was that there may be connections in the system to the legacy Bedford water system, therefore, transmission and distribution capacity is higher in certain areas of the system than shown in the model. This is an issue that will require further investigation by the District to locate and disconnect any connections to old pipelines.

The water model was used to model pressure and flow within the system under various scenarios and compare the results to Wyoming DEQ Rules and Regulations. As summary of the results is as follows:

? The system can provide at least 35 psi at all services during Maximum Daily Demand for 2018 and 2048 demands. Maximum velocities in the water system are estimated to be 2 ft/s under the current MDD and will increase to about 3 ft/s in the 2048 MDD.

? Long waterlines, lack of looping, and undersized waterlines result in low available fire flow in many areas of the system.

? The District cannot maintain 20 psi at all nodes in the system during all conditions of flow (i.e. fire flow event).

? Fire flows and available pressure in the system improves if the well is running. Current set points at the well will not cause it to turn on during fire demand. These set points should be adjusted, and tests performed to make sure the well turns during a fire event.

? Water age on the Muddy String loop is an issue. Over time, new connections and increased demand will solve the problem.

5.0 WATER SOURCE

The Bedford Water and Sewer District has two water supply sources. Those sources are the Big Spring and Spring No. 1, which are located in Strawberry Canyon west of the district boundaries, and Bedford Well #1 which was completed in 1989 to provide supplemental supply to the Bedford water system. The springs in Strawberry Canyon issue from Paleozoic-age formations and flows can be in excess of 10,000 gallons per minute (gpm) during the summer months (Forsgren-Perkins, 1987). During dry winter months flow from the springs can drop to approximately 200 gpm. The amount of water that can be delivered from the springs to the District through the pipeline during maximum/peak demand is approximately 1,466 gpm. The Bedford Well No. 1 is completed in the saturated, permeable sandstones and conglomerates of the Tertiary Salt Lake Formation. The well has a total depth of 308.6 feet and is completed with 12inch casing with 0.060" X 3.0" vertical slots from 177.5 to 288.5 feet. The well is equipped with a 150 HP pump and motor capable of yielding approximately 600 gpm against the distribution system pressure of 160 psi at the wellhead.

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