Riverton City Secondary Water System RIVERTON CITY

Riverton City Secondary Water System

RIVERTON CITY

SECONDARY WATER SYSTEM

IMPACT FEE FACILITIES PLAN (2017)

1/19/2018


RIVERTON CITY

SECONDARY WATER SYSTEM IMPACT FEE FACILITIES PLAN

WRITTEN ANALYSIS

G Trace Robinson, P.E. Riverton City Public Works Director/City Engineer

Riverton City Public Works Department

12526 South 4150 West Riverton City, Utah 84067

November 6, 2017

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ACKNOWLEDGMENTS Background information was provided in previous studies completed by EPIC Engineering. Riverton City Mayor Bill Applegarth City Council Brent Johnson Trent Staggs Sheldon Stewart Tricia Tingey Paul Wayman City Staff Ryan Carter Interim City Administrator G. Trace Robinson P.E Public Works Director/City Engineer Scott Hill - Water Director Daniel K. Woodbury P.E. Water Resources Engineer Lisa Dudley Administrative Services Director Jason Lethbridge Development Services Director


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TABLE OF CONTENTS

PAGE Acknowledgments…………………………………………………………………………………i Table of Contents .......................................................................................................................ii List of Tables……………………………………………………………………………………...…iii List of Figures .................................................................................................................................... iii Acronyms and Abbreviations…………………………………………………………………...iii

Executive Summary ............................................................................................................................1

Introduction ........................................................................................................................................... 3

Demographics ...................................................................................................................................... 23

History .................................................................................................................................................. 3

Planning of Secondary Water System ................................................................................................. 4

Recent Population ................................................................................................................................ 4

Population Growth Projections ........................................................................................................... 5

Definition of the Equivalent Residential Unit (ERU) …………………………………………...6

Projection of Future ERUs ………………………………………………………………………6

Initial Secondary Water System Design …………………………………………………………9

Future Expansion ………………………………………………………………………………...9 Transmission System …………………………………………………………………...10 Pressure Equalization Ponds and Tank ..………………………………………………..11 Pump Stations …………………………………………………………………………..12

Improvement Costs Summary .......................................................................................................... 14 Impact Fee Facilities Plan (IFFP) Legal Requirements………………………………………...17

Identify Existing Level of Service (11-36a-302(1)(a)(i))………………………………17 Establish Proposed Level of Service (11-36a-302(1)(a)(ii)) …………………………..17 Identify Excess Capacity Required to Accommodate Future Growth at Proposed Level of Service (1302(1)(a)(iii))………………………………...17 Identify Demands on Existing Public Facilities by New Development at the Proposed Level of Service (11-36a-302(1)(a)(iv)) ………………………………………...……..17 Identify the Future Infrastructure Required to Meet the Demands of New Development


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(11-36a-302(1)(a)(v)) ……………………………………………………..……………18 Considerations of All Revenue Sources to Finance Impacts on System Improvements (11-36a-302(2))…………………………………………………18 IFFP Certification (11-36a-306(1))……………………………………………………...18

Summary ………………………………………………………………………………………………..….19

LIST OF TABLES

NO. TITLE PAGE 1 Historical Population Growth, 2000 to 2015 .................................................................. 5 2 Projected Population Growth, 2015 to 2030 ..................................................................... 5 3 ERUs (Equivalent 1” Connections)……………………..……………………..………….6 4 Reductions in ERUs on SLR Property ............................................................................... 7 5 Methodology Used to Determine ERUs (1-Inch Equivalent Connections) ........................ 8 6 Projected ERUs 2015 to 2030 ............................................................................................. 9 7 Recommended Transmission Line Capital Projects (2017 to 2030) ................................. 10 8 Recommended Equalization Pond Improvements ............................................................ 11 9 Recommended Pump Station Improvements ……………………………………………12 10 Proposed Future Secondary Water Capital Projects Costs and

Percentage Assigned to New Growth …………………………………………………..15 11 Projected Capital Improvement Schedule, 2017 through 2030 ......................................... 16

LIST OF FIGURES NO. TITLE PAGE

1 System Improvements ....................................................................................................... 1.3

APPENDIX NO. TITLE A Detailed Estimates


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ACRONYMS AND ABBREVIATIONS gpm: gallons per minute ERU: Equivalent Residential Unit IFFP: Impact Fee Facilities Plan JVWCD: Jordan Valley Water Conservancy District LDS: The Church if Jesus Christ of Latter-day Saints LOS: Level of Service MGD: Million Gallons per Day MDA: Master Development Agreement SLR: Suburban Land Reserve WCD: Western Commercial District System: Riverton City Secondary Water System


Impact Fee Facilities Plan November, 2017 Page 1

RIVERTON CITY

SECONDARY WATER SYSTEM IMPROVEMENTS IMPACT FEE FACILITIES PLAN

Executive Summary

The City of Riverton, has completed installation of the majority of a City wide Secondary Water System (System). The System includes over 171 miles of water lines, several pressure equalization and storage ponds, pump stations and supply wells. The present water system was designed to provide for the needs of the current population with little or no excess capacity for new growth. With the development of the western portion of the City, a storage pond, weir modifications on the Welby Jacob Canal, additional pipelines, and new or up-sized pumps will be required to meet the future pumping and distribution demands of the City. This plan assumes that the City will reach full buildout by the year 2030. The System was designed to deliver 1.98 gallons per minute (gpm) per 1” residential connection. In this study, the Equivalent Residential Unit (ERU) is defined as a 1” connection delivering 1.98 gpm for a 24 hour period or 2851 gallons per day. At this rate the present peak day use of the City is calculated at approximately 28 million gallons per day (MGD) increasing to 32MGD at buildout. There are still large areas within the Riverton City boundaries which are not yet fully developed and require additional infrastructure to accommodate growth. The entire City contains approximately 8,064 acres, of which approximately 987 acres remain undeveloped and could be developed by 2030. According to the City's development plans, growth rates of 2.0% or less per year is anticipated over the next 13 years. To accommodate growth, an estimated 1,490 ERUs will be added to the system by the year 2030. The purpose of this Impact Fee Facility Plan (IFFP) is to initiate the process of master planning the System through buildout. In conjunction with the master planning, impact fees will be established which will fund the improvements as they are constructed. Through the combination of impact fees and infrastructure installed by developers, the System will be installed within the western portion of the City. As a result of the creation of the Western Commercial District (WCD), the number of projected 1” connections (ERUs) outlined in this study is greatly reduced as compared to previous studies. The largest single parcel in the WCD consists of approximately 580 acres owned by the LDS Church. The property is managed by a development arm of the Church known as Suburban Land Reserve (SLR). A Master Development Agreement (MDA) has been established between SLR and Riverton City. The agreement outlines development entitlements which describe densities for residential, commercial, and office space. One of the large tenants known as CenterCal will occupy 85 acres of the SLR property. CenterCal has chosen not to use secondary



water to irrigate their development. This parcel and associated impact has been removed from the study. Higher residential densities, along with large parcels of commercial and office space will greatly reduce the irrigable acreage of the property. This IFFP is used as the basis for the establishment of secondary water impact fees. Such impact fees are used for the construction of future transmission mains, storage ponds, pump stations and other facilities associated with the expansion of the System as it relates to new growth. The table below is a summary of the projects and costs required to complete Riverton’s Secondary Water System to facilitate new growth thru City buildout.

FUTURE SECONDARY WATER CAPITAL PROJECTS

Street From To Total Cost

Impact Fee Eligible Costs

4000 W-4150 W Pasture Road 12600 South $357,012 $357,012 4150 West 12600 South 13200 South $477,004 $477,004 4150 West 13200 South 13400 South $213,343 $213,343 4250 West 13200 South 13400 South $246,514 $246,514 4200 West Additional 2 Acre Pond $1,391,046 $1,391,046 4500 West 13400 South 13800 South $325,398 $325,398 13200 South 4570 West Welby Jacobs $221,638 $221,638 13200 South Welby Jacobs 4050 West $236,653 $236,653 13200 South 4050 West Pasture Rd $61,628 $61,628 11800 South Pump Station Additional Pump $84,588 $42,294 4200 West Pump Station Additional Pump $120,840 $120,840 Total $3,735,664 $3,693,370



RIVERTON CITY

SECONDARY WATER SYSTEM IMPROVEMENTS IMPACT FEE FACILITIES

PLAN

Introduction

The purpose of this plan is to update the impact fee eligible capital facilities for the City of Riverton's Secondary Water System to meet the requirements of future growth within the City. This plan consists of an analysis of the location and required sizing of future mainline piping and pumping facilities for the benefit of future connections.

Riverton City has installed a secondary water system throughout the City. The System supplies quality untreated water for outdoor use by all of the citizens and businesses of the City. The purpose of the System is to relieve summer demands on the culinary water system. Benefits of a secondary water system include: conservation of drinking water, and water purchase-cost savings to the citizens.

Demographics

Riverton City is a community of approximately 42,000 people, located directly to the west of the Jordan River at the south end of Salt Lake County, Utah. Riverton is neighbored by Draper City to the east, South Jordan City to the north, Bluffdale to the south and Herriman to the West.

History

Settlement of Riverton began in the 1860's, soon after the Mormon Pioneers reached the Salt Lake Valley. Early settlers lived along the Jordan River. Farms eventually homesteaded on the higher bench lands to the west of the river as the South Jordan and Utah & Salt Lake canals were constructed in the 1870's and 1880's. The area was originally known as Gardnersville. The name Riverton was first used when the area was established as the Riverton precinct of Salt Lake County in 1879.

In the late l800's a central community hub grew up around the intersection of Redwood Road (a major road southward into Utah County) and the Herriman Road (12600 S). Farming and livestock were the industry of the majority of Riverton residents well into the 1900's.



Planning of Secondary Water System

In 1994, the City Council realized that it would be prudent for the City to construct a secondary water system within the City to use non-potable quality water for outdoor watering. The Council felt that this was important because of the increasing scarcity of potable water sources and increasing costs of purchasing water. At that time the City implemented a secondary water ordinance requiring all new development to install secondary waterlines.

In 1997, the City obtained funding for the first phase of a City- wide secondary water system. The System included pump stations, pressure equalization ponds, a distribution and pipe networks. Design of the system started in 1998 and construction started in early 1999. Construction of this first phase was completed in the spring of 2002.

The second phase of the System expanded the water distribution network westward from approximately 4000 W to the west City boundary. Construction of this phase included the installation of large diameter piping in 4000 W, 11800 S, 12600 S and 13400 S; an additional equalization pond, a large diameter feeder main to the pond and additional pump stations.

Recent Population

In recent years the population of Riverton has grew substantially. The population doubled in the 1990's from 11,261 people in 1990 to 22,677 people in 1998. The 1999 Capital Facilities Plan projected a growth rate of 5% through 2005. The 2000 Census showed that the official population of Riverton was 25,011 people with 6,555 homes and 3.82 people per household. Table 1 shows the historical population growth and number of System connections.



TABLE 1

Population Growth Projections For this plan, it is anticipated that the City will reach full buildout by the year 2030. Future population and connection rates will vary over the next several years. High growth rates as seen in the past are not anticipated to occur in the future. Anticipated growth rates of 2.0% or less per year have been projected through 2030. Table 2 below shows the projected household and population growth used in this plan.

TABLE 2

PROJECTED POPULATION GROWTH

2015 to 2030 Year 2016 *2020 *2025 *2030

Population 41,900 46,033 50,567 55,500

% Increase Population 10.92% 9.85% 9.76%

Average Population Growth/ Yr Over 5-Yr Period 2.18% 1.97% 1.95%

*Projected

HISTORICAL POPULATION GROWTH 2000 to 2015

Year 2000 2005 2010 2015

Population 25,011 32,800 38,753 41,500

Connections City Wide 6,146 7,505 8,991 9,509

Con. Increase 1,359 1,486 518

% Increase Population 31.14% 18.15% 7.09%

Average Population Growth/ Yr Over 5-Yr. Period 6.23% 3.63% 1.42%

Average Connection Growth/Yr Over 5-Yr Period 4.42% 3.96% 1.15%



Definition of the Equivalent Residential Unit (ERUs) In Riverton, secondary water is not sold at a metered rate but by a monthly rate base on the size of the connection. The minimum size used in the System is a 1” connection. Riverton City ordinance requires that each single family residential dwelling receive a one inch connection. For this plan, the definition, for an Equivalent Residential Unit (ERU) is defined as a 1” connection delivering 1.98 gpm for a 24 hour period or 2851 gallons per day. Connections for multi-family and commercial developments will be sized by engineering calculations of flow requirements based on their consumptive needs. ERUs will be calculated using multipliers of equivalent 1” connections for greater flows. Table 3 below lists the comparison of connection sizes and their relationship to a 1” residential connection.

TABLE 3

ERUs (EQUIVALENT 1” CONNECTIONS)

Pipe Size

Pipe Size Feet

Area of Pipe Multiplier

1" 0.083 0.005 1 1-1/2" 0.125 0.012 2.25 2” 0.167 0.022 4.00 2-1/2" 0.208 0.034 6.25 3" 0.250 0.049 9.00 4" 0.333 0.087 16.00 6" 0.500 0.196 36.00 8" 0.667 0.349 64.00

Projection of Future ERUs There are still large areas within the Riverton City boundaries which are not yet fully developed. The City contains approximately 8,064 acres of which approximately 987 acres remain undeveloped but could be developed by 2030. According to the City's development plans and anticipated growth rates of 2.0% or less, projections of 1,490 new Equivalent Residential Units (ERUs) will be added to the System by the year 2030.



As a result of the creation of the Western Commercial District (WCD), the number of projected 1” connections (ERUs) in this study is greatly reduced as compared to previous studies. The WCD consist of approximately 580 acres owned by the LDS Church. The property is managed by a development arm of the Church known as Suburban Land Reserve (SLR). A Master Development Agreement (MDA) has been established between SLR and Riverton City that provides development entitlements for the property. The MDA is very specific as it relates to the number of single family residential units, office space, retail space, and recreational space. Higher residential densities, along with large parcels of commercial and office space will reduce the irrigable acreage of the property. One of the large tenants known as CenterCal will occupy 85 acres of the SLR property. CenterCal has chosen not to use secondary water to irrigate their development. This parcel and associated impact have been removed from this study. The MDA offers detail that provides higher accuracy of projected ERUs on the remaining property. Table 4 shows the reduction of connections from changes outlined in the SLR MDA vs. traditional residential zoning using 2.5 homes/acre of development.

TABLE 4 Reductions in ERUs on SLR Property ERUs

Assume Residential zoning 2.5 units/acre Without Agreement (580 Acres) 1450 Connections With Development Agreement 315 Reductions in Connections due to change of use on SLR Property -1135

Table 5 shows the method for determining new ERUs based on the MDA and City-wide zoning of the undeveloped land. Using this methodology, projections of future ERUs was completed. This number does not match projected population growth rates due to anticipated higher densities and the use of master meters on large areas of commercial and office space.



TABLE 5

Methodology Used to Determine ERUs (1-inch Equivalent Connections)

SLR Property to be Developed ERUs Assume 1 - 1” meter/single family residential dwelling Assume 1 - 2" meter / 5 acres Assume 1 - 2" meter equivalent = 4 - 1" meters SLR Total = 580 acres CenterCal Total = 85 acres (no secondary water) 0 Dedicated open space = 30 acres 0 20 Acres Single Family Homes @ 2.5 connections/acre 50 Assume 25% Roads and impervious area SLR irrigable area (580 -(88+30+20) = 442 acres Equivalent 2” Connections ( 442 x.75)/5 = 66.3 Equivalent 1" Connections 66.3 x 4 (4 is the multiplier for a 2” connection) 265

Subtotal ERUs 315

Remainder of City Property to be Developed ERUs Use 460 acres residential @ 2.5 units/ acre 1150 Use 15 Commercial buildings (20 Acres) with 1 inch meter/building 15 Use 10 office buildings (15 acres)with1 inch meter/building 10

Subtotal ERUs 1175 Total ERUs 1490

Table 6 shows projected ERUs from 2015 through 2030 based on assumptions of the population growths found in Table 2.



TABLE 6

PROJECTED ERUs 2015 to 2030 Year 2015 *2020 *2025 *2030

Population 41,500 46,033 50,567 55,500

Total ERUs 9,509 10,025 10,557 11,104

Increased ERUs 411 532 547

Average ERU Growth/Yr Over 5-Yr Period

1.09% 1.06% 1.04%

*Projected

Initial Secondary Water System Design

The existing System was designed and implemented in two phases. Each phase was designed to include excess capacity for future growth. Since implementation, the areas served by each phase has developed and the System is operating at or near design capacity. A brief description of each of these phases is as follows:

Phase 1: This was the beginning of the Riverton Secondary Water System. To accommodate new growth Phase I included over-sizing and constructing the pipelines, pump stations and reservoirs included with the initial system. This phase encompassed the area primarily east of Bangerter Highway and included some piping to 4000 W. These facilities were funded by bonding designated as the "2000 Bond." Phase 2: Included over-sizing of pipelines and reservoirs associated with the expansion of the System west of 4000 W to 4800 W. These facilities were funded by bonding designated as the "2003 Bond." Phase II did not include excess capacity to provide secondary water services for the property found in the WCD.

Future Expansion

As shown in Table 6, the System will expand by approximately 1490 ERUs with the majority of future growth on the west side of the Bangerter Highway. To complete the System, additional storage, supply capacity and transmission lines will be required for future connections.



Transmission System

The City’s transmission system has been completed east of the Bangerter Highway and in 13400 S, 12600 S, and 11800 S west of Bangerter. All new transmission infrastructure projects remaining to be completed for future growth are west of the Bangerter Highway. A list of the future projects and costs can be found in Table 7. Detailed estimates can be found in Appendix A.

TABLE 7

RECOMMENDED TRANSMISION LINE CAPITAL PROJECTS

(2017 to 2030) Street From To Total Cost

4000 W-4150 W Pasture Road 12600 S $357,012 4150 W 12600 S 13200 S $477,004 4150 W 13200 S 13400 S $213,343 4250 W 13200 S 13400 S $246,514 4500 W 13400 S 13800 S $325,398 13200 S 4570 W Welby Jacob $221,638 13200 S Welby Jacob 4050 W $236,653 13200 S 4050 W Pasture Rd $61,628

Total $2,139,190

Pressure Equalization Ponds and Tank

The existing System has three pressure equalization ponds and one storage tank, each serving one of the pressure zones. It is recommended that equalization ponds be sized with at least one day’s storage allowing the System the flexibility to peak off the equalization ponds or tank and provide short-term storage in the event of power failure to the pump stations.



The projected number of ERUs in the City will increase to 11,104 by the year 2030. This growth will require storage capacity beyond that provided by the existing ponds. An additional 20 acre feet of storage is required for zone 4 as the WCD develops. Analysis of pond construction and upsizing options showed that increasing the size of the pond located at 4200 W and approximately 13500 S is the most economical option. It is recommended that the 4200 W pond be up-sized to provide the extra storage required for pressure Zone 4. This will work with Black Ridge Reservoir in Herriman which serves as an equalization pond and additional storage. The cost of the pond improvements is listed in Table 8 below. The locations of this improvement is shown on Figure 1.

The expansion of the 4200 W pond will include the purchase of two acres of land to accommodate the addition of approximately 20 acre feet of storage to the pond. The cost of the land acquisition is assumed to be $275,000 per acre and construction costs are estimated at $35,000 per acre foot of storage.

TABLE 8

RECOMMENDED PRESSURE EQUALIZATION POND

IMPROVEMENTS

Up-size 4200 W Pond - Land Purchase 2 Acres $275,000 $550,000 Up-Size 4200 W Pond - Construction $841,046 $841,046 Total $1,391,046



Pump Stations

The existing System consists of a combination of transmission pumps and booster pump stations. The main sources of water for the System comes from the Jordan River and from irrigation canals that run through the City. The pumps are used to pressurize the system and move water to the equalization ponds and storage facilities. The existing system has little or no capacity for new growth and therefore the construction of additional capacity is required.

In order to meet the demands for future growth in pressure Zone 4 and the WCD, increased capacity will be required. This can be accomplished by increasing the capacity of the pump station at 4200 W and 13500 S and 4000 W and 11800 S. The pump stations will need to have a combined increased capacity of approximately 5 MGD during peak use at buildout. Table 9 shows the costs for each expansion and Figure 1 shows the location of the proposed improvements.

TABLE 9 RECOMMENDED PUMP STATION

IMPROVEMENTS

Pump Station Total Cost 11800 S approx. 4000 W $84,588 4200 W approx. 13500 S $120,840

Total $205,428

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Secondary Water Main

Priority Street From To Year11 4000 W-4150 W Pasture Road 12600 South 2027

7 4150 West 12600 South 13200 South 20236 4150 West 13200 South 13400 South 20232 4200 West 13200 South 13400 South 20183 4500 West 13400 South 13800 South 20201 13200 South 4570 West Welby Jacobs 2016-175 13200 South Welby Jacobs 4050 West 2021

10 13200 South 4050 West Pasture Rd 20258 20209 20214 11800 South Pump Station upgrade 2019

Purchase Property for 4200 West Pond Up-Size (4 Acre )

Projected Capital Improvement Schedule 2017 through 2030

Up-Size 4200 West Pond (20 Acre Feet)

Figure 1



Improvement Costs Summary

The cost of improvements to the Riverton System to accommodate new growth includes the installation of future transmission mains, construction of a new equalization and storage pond, and increasing the pumping capacity of two existing pump stations. The costs for construction, engineering, and percentage of construction assignment to new growth for each of these projects can be found in Table 10 below.



TABLE 10

PROPOSED FUTURE SECONDARY WATER CAPITAL PROJECT COSTS AND % ASSIGNED TO NEW GROWTH

Street From To Construction

Cost Engineering

Costs Total Cost % to

Growth Cost to Growth

% City Funded

Impact Fee Eligible Costs

4000 W-4150 W Pasture Road 12600 South $ 323,279 $ 33,733 $357,012 100.00% $357,012 100% $357,012 4150 West 12600 South 13200 South $426,793 $50,211 $477,004 100.00% $477,004 100% $477,004 4150 West 13200 South 13400 South $190,886 $22,457 $213,343 100.00% $213,343 100% $213,343 4250 West 13200 South 13400 South $220,565 $25,949 $246,514 100.00% $246,514 100% $246,514

4200 West Additional 2 Acre Pond $1,302,515 $88,531 $1,391,046 100.00% $1,391,046 100% $1,391,046

4500 West 13400 South 13800 South $291,146 $34,252 $325,398 100.00% $325,398 100% $325,398 13200 South 4570 West Welby Jacobs $200,696 $20,942 $221,638 100.00% $221,638 100% $221,638 13200 South Welby Jacobs 4050 West $211,742 $24,911 $236,653 100.00% $236,653 100% $236,653 13200 South 4050 West Pasture Rd $55,141 $6,487 $61,628 100.00% $61,628 100% $61,628 11800 South Pump Station Additional Pump $75,684 $8,904 $84,588 50.00% $42,294 100% $42,294 4200 West Pump Station Additional Pump $108,120 $12,720 $120,840 100.00% $120,840 100% $120,840 Total $3,406,567 $329,097 $3,735,664 $3,693,370 $3,693,370



A projected timeline for the installation of the identified capital facility improvements is listed in Table 11. The priority number in the left column of this Table is used to identify each project in Figure 1.

TABLE 11

PROJECTED CAPITAL IMPROVEMENT SCHEDULE 2017 THROUGH 2030

Priority Street From To Eligible

Cost Year

1 13200 S 4570 W Welby Jacob $221,638 2016-17

2 4250 W 13200 S 13400 S $246,514 2018

3 4500 W 13400 S 13800 S $325,398 2020

4 11800 S Pump Station Additional Pump $42,294 2019

5 13200 S Welby Jacob 4050 W $236,653 2021

6 4150 W 13200 S 13400 S $213,343 2023

7 4150 W 12600 S 13200 S $477,004 2023

8 Purchase Property for 4200 W Pond Up-Size (2 Acre ) $550,000 2020

9 Up-Size 4200 W Pond (20 Acre Feet) $841,046 2021

10 4200 West Pump Station Additional Pump $120,840 2021

11 13200 S 4050 W Pasture Rd $61,628 2025

12 4000 W-4150 W Pasture Road 12600 S $357,012 2027

Total $3,693,370

As shown in Table 11, these capital improvement projects are expected to be completed within the next 10 years. The collection of impact fees that will pay for these projects will be collected during the longer thirteen year study period. However, sufficient funds may not be available at the proposed construction date and the City may need to postpone construction or use other funding options to finance the improvement projects.



Impact Fee Facilities Plan (IFFP) Legal Requirements There are certain legal requirements which need to be met in developing IFFP Plans. The following is a summary of the legal requirements and the criteria described in the plan to meet these obligations.

Identify Existing Level of Service (11-36a-302(1)(a)(i))

The existing Level of Service is 1.98 gallons per minute (gpm) per equivalent 1” connection with a range of pressure between 45 psi and 120 psi.

Establish Proposed Level of Service (11-36a-302(1)(a)(ii))

Riverton’s System is nearly complete with the exception of lines to be constructed in the WCD. The System was designed with full buildout in mind with the initial planning of the System. The initial planning, design and phasing of the System was described in previous sections of this plan and was determined by previous engineering studies performed by Gilson and EPIC Engineering Consultants. The System was designed and constructed to provide 1.98 gallons per minute (gpm) at a minimum pressure of 45 psi for each 1-inch equivalent connection.

Identify Excess Capacity Required to Accommodate Future Growth at Proposed Level of Service (11-36a-302(1)(a)(iii))

As describe in the “System Improvements for Future Growth” section of this plan, the development of the System included providing and sizing infrastructure to accommodate the future growth of the City at the design Level of Service (LOS) described above. The majority of the System has met its demand and the remaining growth will depend on the construction of additional infrastructure. The proposed pipe network, equalization storage, and pumps, are sized to meet the future demands of the western portion of the City at full buildout.

Identify Demands on Existing Public Facilities by New Development at the Proposed Level of Service (11-36a-302(1)(a)(iv))

There are two elements associated with the impact of new development on the System:

Infrastructure to deliver the System water to new development.

Increased volume of System water to offset the impact of new development.

As previously stated, the System is and will be constructed to include required capacities to accommodate new growth thru buildout. Impact fees are used to construct additional infrastructure necessary to maintain the LOS of the conveyance network. In addition to the impact fee, Riverton requires the dedication of water shares for all new development. The volume dedicated is proportionate to the type of uses found in the development.



The impact fee process provides the delivery of water necessary to meet development needs without compromising the integrity of the System.

Based on the proposed previously described LOS, water use will increase by 4.3 million gallons per day at buildout as compared to the existing consumptive volume.

Identify the Future Infrastructure Required to Meet the Demands of New Development (11-36a-302(1)(a)(v))

Future infrastructure, required to meet the demands of transmission, storage, and equalization for new development is identified in Table 10 of the IFFP Plan. This infrastructure provides the Level of Service described above and will provide capacity described in previous plans.

Considerations of All Revenue Sources to Finance Impacts on System Improvements (11-36a-302(2))

In order to provide a complete System, initial planning included the exploration of sources to finance the System. Sources considered were the City’s general fund, water revenue bonds, grants, and impact fees. The City constructed the initial system using water revenue bonds, grants, and impact fees. After the initial construction of the infrastructure, use of impact fees has become the major source of funding used to complete remaining components of the System as it relates to new growth. The buy-in component of impact fees is used to pay the growth component of the water revenue bonds.

IFFP Certification (11-36a-306(1)

We certify that the information provided in this IFFP is true and correct to the best of our knowledge and professional judgement. Certain data, such as future growth rates, are projections based on sound industry practices, but may not exactly reflect the realized values once they do occur. Every effort has been undertaken to represent the current and future information in as accurate a manner as possible. This IFFP was developed for Riverton City Corporation and was prepared in conformity with industry standards and principles generally accepted in the State of Utah.



Summary The purpose of the Impact Fee Facilities plan is to study the infrastructure required to meet the needs of new growth and develop a means of providing funding for construction. In this plan, Riverton Engineering Staff identified and provided engineered estimates for infrastructure needs and established a time frame for which the infrastructure is to be constructed. Staff evaluated the existing infrastructure and system and determined that the existing system is at or near design capacity. It was also determined that the proposed future infrastructure will complete the system and meet the demand of future growth in the western portion of the City. In conclusion, this plan provides the tools necessary to determine an equitable impact fee to be applied across the City to cover costs associated with new development. This plan will be reviewed by a consultant who will determine impact fees.

APPENDIX A

Detailed Infrastructure Cost Estimates

Future Secondary Water Capital Projects

4000 W- 4150 W

Riverton 4000 W

11800 S - 12600 S

Item Unit Quantity Unit Price Amount

12 Inch DI Secondary Water Line L.F. 2600 $ 102.00 $ 265,200.00

Subtotal $ 265,200.00

Contingency 0% $ -

Subtotal $ 265,200.00

Mobilization 6% $ 15,912.00

Subtotal $ 281,112.00

Utilities by Owner 15% $ 42,166.80

Right-of-Way S.F. 0 $ 8.00 $ -

Total Construction Costs + ROW Subtotal $ 323,278.80

Preconstruction Engineering 6% $ 16,866.72

Construction Engineering 6% $ 16,866.72

Subtotal $ 357,012.24

Project Cost $ 357,012.24

Total $ 1,047,359.08

88 ROW 63 ft pavement

***** New Construction

4000 W- 4150 W

Riverton4150 W New Construction With Trax

12600 S - 13000 S



Subtotal $ 151,980.00

Contingency 0% $ -

Subtotal $ 151,980.00


Subtotal $ 161,098.80






Subtotal $ 183,652.63


110' ROW 54' Pavement 6' Sidewalk, 4' Landscape Park strip

Length of Section 1490

4000 W- 4150 W

Riverton 4150 W New Construction With Trax

13000 S - 13200 S



Subtotal $ 242,760.00

Contingency 0% $ -

Subtotal $ 242,760.00


Subtotal $ 257,325.60






Subtotal $ 293,351.18


140' ROW 54' Pavement 6' Sidewalk, 10' Landscape Park strip


4000 W- 4150 W

Riverton 4050 W New Construction

13200 S - TRAX transition (500')



Subtotal $ 51,000.00

Contingency 0% $ -











58' Pavement 6' Sidewalk, 6' Landscape Parkstrip


4000 W- 4150 W

Riverton 4050 W New Construction

TRAX transition - 13400 S



Subtotal $ 125,550.00

Contingency 0% $ -

Subtotal $ 125,550.00


Subtotal $ 133,083.00






Subtotal $ 151,714.62


66' Pavement 5' Sidewalk, 6' Landscape Parkstrip


4200 W

Total $ 1,637,560.00

Riverton New Construction 4250 W

13200 S - 13400 S


12 inch DI Secondary Water Line L.F. 2000 $ 102.00 $ 204,000.00

Subtotal $ 204,000.00

Contingency 0% $ -

Subtotal $ 204,000.00


Subtotal $ 216,240.00



Construction Costs+ROW Subtotal $ 220,564.80



Subtotal $ 246,513.60


44' Pavement, 5' Sidewalk,6' Parkstrip Length of Section 2000

4200 W

Riverton New Construction 4200 W Pump Station

Additional Pumps for WCD


Construct 2 acre Pond LS 1 $ 696,000.00 $ 696,000.00

Subtotal $ 696,000.00

Contingency 0% $ -

Subtotal $ 696,000.00


Subtotal $ 737,760.00


Right-of-Way Acres 2 $ 275,000.00 $ 550,000.00

Construction Costs+ROW Subtotal $ 1,302,515.20



Subtotal $ 1,391,046.40

Project Cost $ 1,391,046.40

4570 W- 4500 W

Total $ 325,397.95

Riverton New Construction 4500 W

13400 S - 13800 S


12 inch DI Secondary Water line L.F. 2640 $ 102.00 $ 269,280.00

Subtotal $ 269,280.00

Contingency 0% $ -

Subtotal $ 269,280.00


Subtotal $ 285,436.80



Construction Costs +ROW Subtotal $ 291,145.54



Subtotal $ 325,397.95


66' Pavement, 5' sidewalk, 6' Park strip Length of Section 2640

13200 S

Total $ 519,919.82

Riverton New Construction 13200 S

4570 W - Welby Jacob


12 inch DI Secondary Water Line L.F. 1320 $ 102.00 $ 134,640.00

Canal Crossing L.S. 1 $ 30,000.00 $ 30,000.00

Subtotal $ 164,640.00

Contingency 0% $ -

Subtotal $ 164,640.00


Subtotal $ 174,518.40



Construction Costs + ROW Subtotal $ 200,696.16



Subtotal $ 221,638.37


125' ROW 54' pavement 6' SW 19' Park strip


13200 S


Welby Jacob - 4050 W


12 inch DI Secondary Water Lined L.F. 1920 $ 102.00 $ 195,840.00

Subtotal $ 195,840.00

Contingency 0% $ -

Subtotal $ 195,840.00


Subtotal $ 207,590.40



Construction Costs Subtotal $ 211,742.21



Subtotal $ 236,653.06


58' pavement


13200 S


4050 W - Pasture Road Line


12 inch DI Secondary Water Lined L.F. 500 $ 102.00 $ 51,000.00


Contingency 0% $ -






Construction Costs Subtotal $ 55,141.20





11800 S Pump Station

Total $ 42,294.00

Riverton 11800 S Pump Station Improvements Approximately 4300 W


Add Pump to 11800 S Pump Station LS 1 $ 70,000.00 $ 70,000.00


Contingency 0% $ -





Right-of-Way Acres 0 $ - $ -

Construction Costs+ROW Subtotal $ 75,684.00




Project Cost 50% eligible $ 42,294.00

4200 W Pump Station

Riverton 4200 West Pump Station Improvements

Approximately 13500 South


Add Pump to 400 HP Pump LS 1 $ 100,000.00 $ 100,000.00

Subtotal $ 100,000.00 Contingency 0% $ -

Subtotal $ 100,000.00 Mobilization 6% $ 6,000.00

Subtotal $ 106,000.00 Utilities by Owner 2% $ 2,120.00 Right-of-Way Acres 0 $ - $ - Construction Costs+ROW Subtotal $ 108,120.00 Preconstruction Engineering 6% $ 6,360.00 Construction Engineering 6% $ 6,360.00

Subtotal $ 120,840.00

Documents

Riverton City Secondary Water System RIVERTON CITY