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Home My WebLink About3564 ResolutionRESOLUTION NO. -3S(v�- A RESOLUTION accepting the Irrigation System Master Plan prepared by MSA Associates. WHEREAS, the city presently provides irrigation water to more than 6,000 citizens and the city's population is expected to continue to grow; and WHEREAS, the city relies on approximately 932 acre feet of water from the Columbia River and 11 well sites for its irrigation water supply; and WHEREAS, withdrawals from the Columbia River are strictly regulated by the state in its effort to balance the needs of various user interests and it is, therefore, expected that additional withdrawals from the Columbia River will become increasingly difficult; and WHEREAS, the city acquired and has greatly expanded an irrigation system serving much of the Pasco plateau, thus partially mitigating the consumption of domestic raw water supply associated with urban growth on the plateau; and WHEREAS, the city recognizes the increasing need to preserve and conserve its irrigation supply as well as optimize the use and benefit of the wells it owns and operates; and WHEREAS, the city's consultant, MSA Associates, has studied the city's domestic and irrigation system supplies and has developed a management plan designed to optimize long -term use of the city's limited water supplies; NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF PASCO, WASHINGTON, DO RESOLVE AS FOLLOWS: Section 1. That the City Council hereby accepts the Irrigation System Master Plan prepared by MSA Associates, attached hereto as Exhibit A, to be used as a guide by staff and Council in making various decisions about the city's irrigation system. PASSED by the City Council of the City of Pasco at its regular meeting this 4 day of 2014. Matt Watkins, Mayor A T T: Debra Clark, City Clerk APPRO D AS TO FORM: Leland B. Kerr, City Attorney CITY OF PASCO, WASHINGTON IRRIGATION SYSTEM MASTER PLAN December 2013 13-1444.407 i Irrigation System Master Plan December 2013 Acknowledgements City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\acknowledgements page final.docx ACKNOWLEDGEMENTS The following City of Pasco staff contributed to the development of this Irrigation System Master Plan: Ahmad Qayoumi, Public Works Director Teresa Reed-Jennings, Senior Utilities Engineer Cameron Magelsen, Irrigation System Manager Curtis Glines, Irrigation System Operations Reuel Klempel, Wastewater Treatment Plant Manager Doyle Heath, Engineering Technician The following GSI Water Solutions, Inc. staff contributed to the development of this Irrigation System Master Plan: Phillip A. Brown, RG LHg Kenny Janssen, RG 13-1444.407 ii Irrigation System Master Plan December 2013 Table of Contents City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\table of contents.docx TABLE OF CONTENTS EXECUTIVE SUMMARY Authorization ........................................................................................................... ES-1 Background .............................................................................................................. ES-1 Purpose ..................................................................................................................... ES-1 Irrigation System Plan Overview ............................................................................. ES-1 Existing System ........................................................................................................ ES-2 Supply ........................................................................................................... ES-2 Groundwater Supplies ....................................................................... ES-2 Surface Water Supplies ..................................................................... ES-4 Water Rights Summary ..................................................................... ES-5 Storage .......................................................................................................... ES-6 Pressure Zones .............................................................................................. ES-6 Booster Pump Stations .................................................................................. ES-6 Dry Systems .................................................................................................. ES-6 Irrigation Water Demands ........................................................................................ ES-7 Irrigation System Analysis and Findings ................................................................. ES-7 Hydraulic Model ........................................................................................... ES-7 Analysis Criteria ........................................................................................... ES-8 Flow Velocities ................................................................................. ES-8 Irrigation System Pressures ............................................................... ES-8 Model Analysis and Findings ....................................................................... ES-8 Existing Conditions ........................................................................... ES-8 Future Conditions .............................................................................. ES-9 Storage Analysis ......................................................................................... ES-12 Well Condition Assessment ................................................................................... ES-12 Recommendations .................................................................................................. ES-12 1. INTRODUCTION Authorization ............................................................................................................. 1-1 Background ................................................................................................................ 1-1 Purpose and Scope ..................................................................................................... 1-1 Irrigation System Plan Overview ............................................................................... 1-1 2. EXISTING SYSTEM Introduction ................................................................................................................ 2-1 Existing Irrigation System .......................................................................................... 2-1 Supply ............................................................................................................. 2-4 Groundwater Supplies ......................................................................... 2-4 13-1444.407 iii Irrigation System Master Plan December 2013 Table of Contents City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\table of contents.docx Surface Water Supplies ....................................................................... 2-4 Water Rights Summary ....................................................................... 2-4 Storage ............................................................................................................ 2-4 Distribution ..................................................................................................... 2-7 Pressure Zones .................................................................................... 2-7 Booster Pump Stations ........................................................................ 2-7 Dry Systems ........................................................................................ 2-8 Interties to Other Systems ................................................................... 2-8 Irrigation System Demands ........................................................................................ 2-8 Production Records ......................................................................................... 2-8 Overall System Usage..................................................................................... 2-8 Residential Demands .................................................................................... 2-10 Commercial Demands .................................................................................. 2-10 Agricultural Demands ................................................................................... 2-11 General Operating Procedures ................................................................................. 2-11 Water Quality ........................................................................................................... 2-12 Agreements with Kidwell Farms, Inc. ..................................................................... 2-12 Rate Schedule ........................................................................................................... 2-12 Summary .................................................................................................................. 2-12 3. CRITERIA, ANALYSIS, AND FINDINGS Introduction ................................................................................................................ 3-1 Irrigation System Analysis ......................................................................................... 3-1 Model Layout .................................................................................................. 3-1 Pipe Characteristics ........................................................................................ 3-1 Water Demand Distribution ............................................................................ 3-2 Wells ............................................................................................................... 3-2 Model Calibration ........................................................................................... 3-2 Analysis Criteria ............................................................................................. 3-3 Flow Velocities ................................................................................... 3-3 Irrigation System Pressures ................................................................. 3-3 System Storage .................................................................................... 3-4 Model and Analysis Findings ......................................................................... 3-4 Existing Conditions ............................................................................. 3-4 Future Conditions ................................................................................ 3-5 Storage ................................................................................................. 3-5 Operations and Maintenance Problems .......................................................... 3-8 Northwest Commons Well Use ........................................................... 3-8 Freshwater Mussels ............................................................................. 3-8 Access to Pipes in Island Estates and Sunny Meadows ...................... 3-8 Interstate Highway 182 Crossing ........................................................ 3-8 Telemetry System and Communications ........................................................ 3-9 Well Condition Assessment ....................................................................................... 3-9 13-1444.407 iv Irrigation System Master Plan December 2013 Table of Contents City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\table of contents.docx Data Review and Gap Analysis ...................................................................... 3-9 Observations and Analysis ........................................................................... 3-10 Summary .................................................................................................................. 3-10 4. RECOMMENDATIONS Introduction ................................................................................................................ 4-1 Improvements Completed Since 2005 ....................................................................... 4-1 Distribution System Improvements ............................................................................ 4-2 Irrigation Main Improvements ........................................................................ 4-2 Interstate Highway 182 Crossing Isolation Valve Improvements .................. 4-2 Island Estates and Sunny Meadows Distribution Isolation Valve Improvements ................................................................................................. 4-3 Northwest Commons Well and Pivot ............................................................. 4-3 Telemetry Improvements ........................................................................................... 4-3 Source and Storage Improvements ............................................................................. 4-3 Storage ............................................................................................................ 4-4 Irrigation Well Improvements ........................................................................ 4-4 Well Assessment and Rehabilitation Plan........................................... 4-4 Well Data Acquisition ......................................................................... 4-5 Village of Pasco Heights Well Replacement ...................................... 4-6 Construction of New Irrigation Wells ................................................. 4-7 Well Houses ........................................................................................ 4-7 Well Performance Monitoring Program.............................................. 4-7 Dry Systems ............................................................................................................. 4-8 Recommendations for Further Study and Planning ................................................... 4-8 Well Field Study ............................................................................................. 4-8 Freshwater Mussels ........................................................................................ 4-8 Rate Structure Study ....................................................................................... 4-8 Irrigation System Master Plan Update ............................................................ 4-9 Project Cost Estimates ................................................................................................ 4-9 Summary .................................................................................................................... 4-9 APPENDICES Appendix A: Water Quality Data Appendix B: 2007 Residential Water Use Study Memorandum Appendix C: Operating Agreements Appendix D: Project Cost Estimates 13-1444.407 v Irrigation System Master Plan December 2013 Table of Contents City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\table of contents.docx LIST OF FIGURES Figure ES-1: Existing Irrigation System................................................................. ES-3 Figure ES-2: Total System Production ................................................................... ES-7 Figure ES-3: Hydraulic Modeling Results for Existing Conditions ..................... ES-10 Figure ES-4: Hydraulic Modeling Results for Future Conditions ........................ ES-11 Figure 2-1: Existing Irrigation System................................................................... 2-2 Figure 2-2: Existing Irrigation System Hydraulic Profile ...................................... 2-3 Figure 2-3: Total System Production ..................................................................... 2-9 Figure 3-1: Hydraulic Modeling Results for Existing Conditions ......................... 3-6 Figure 3-2: Hydraulic Modeling Results for Future Conditions ............................ 3-7 Figure 4-1: Proposed Irrigation System Improvements ....................................... 4-14 LIST OF TABLES Table ES-1: Irrigation Main Inventory by Size ..................................................... ES-2 Table ES-2: Irrigation Well Summary .................................................................. ES-4 Table ES-3: Irrigation Water Rights Summary ..................................................... ES-5 Table ES-4: Dry System Summary ....................................................................... ES-6 Table ES-5: Recommended Capital Improvement Budget Summary ................ ES-13 Table ES-6: Near-Term Capital Improvement Program Summary .................... ES-14 Table ES-7: Long-Term Capital Improvement Program Summary .................... ES-16 Table 2-1: Irrigation Main Inventory by Size ....................................................... 2-1 Table 2-2: Irrigation Well Summary .................................................................... 2-5 Table 2-3: Irrigation Water Rights Summary ....................................................... 2-6 Table 2-4: Pressure Zone Summary ..................................................................... 2-7 Table 2-5: Dry System Summary ......................................................................... 2-8 Table 2-6: Peaking Factor Summary .................................................................... 2-9 Table 2-7: Irrigation System Connections Summary ......................................... 2-10 Table 2-8: Summary of Agricultural Demands .................................................. 2-11 Table 2-9: Irrigation Utility Fees and Rates Summary ....................................... 2-13 Table 3-1: Hydraulic Modeling Calibration Summary ......................................... 3-3 Table 3-2: Irrigation Well Data Summary and Gap Analysis ............................ 3-11 Table 3-3: Irrigation Well Ranking Summary .................................................... 3-12 Table 3-4: Well Condition Assessment Summary.............................................. 3-12 Table 4-1: Irrigation System Improvements Completed Since 2005 ................... 4-1 Table 4-2: Recommended Well Rehabilitation and Performance Testing Activity Summary .................................................................. 4-6 Table 4-3: Irrigation Well Data Acquisition Recommendations Summary ......... 4-6 Table 4-4: Near-Term Capital Improvement Program Summary ...................... 4-10 Table 4-5: Long-Term Capital Improvement Program Summary ...................... 4-12 Table D-1: Irrigation Main Project Cost Summary .............................................. D-1 Table D-2: Well Rehabilitation and Assessment Project Cost Summary ............ D-2 Table D-3: Village of Pasco Heights Well Replacement 13-1444.407 vi Irrigation System Master Plan December 2013 Table of Contents City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\table of contents.docx Project Cost Summary ........................................................................ D-4 Table D-4: New Irrigation Well Project Cost Summary ...................................... D-5 EXECUTIVE SUMMARY 13-1444.407 Page ES-1 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx EXECUTIVE SUMMARY Authorization On June 4, 2013, Murray, Smith & Associates, Inc. (MSA) was authorized by the City of Pasco (City) to prepare this plan. Background The City of Pasco owns and operates an irrigation water utility that provides water to residential customers and a limited number of commercial customers. Providing a system for irrigation water separate from the potable water utility allows the City's customers to avoid using treated drinking water to irrigate. The City's existing irrigation system is supplied by water from 11 groundwater wells and water pumped from the Columbia River. The City acquired the first portions of the system in 2002 from a private irrigation utility. The system has grown considerably since that time. The City uses the irrigation system annually from April 1st to October 31st. The City has established the goal of developing a capital improvements plan for the irrigation system to ensure the continued delivery of economical irrigation water to City residents. Purpose The purpose of this plan is to provide a basis for identifying, analyzing, and planning capital improvements to the irrigation system. The study includes a hydraulic analysis of the existing system which compares the existing system's performance to analysis criteria in order to identify deficiencies and develop system improvements. A capital improvements plan is developed to assist in planning future projects. Included with this plan are conceptual level project cost estimates. The system's existing groundwater wells will also be evaluated through a tabletop review of existing data. The results of this review will be used to develop preliminary recommendations for improvements, further assessment, and rehabilitation work. Irrigation System Plan Overview This plan is organized by sections. Section 2 presents an inventory of the irrigation system and its components as they currently exist and operate. The City's irrigation water rights are also discussed in Section 2. Section 3 presents analysis criteria that form the basis for identifying deficiencies in system performance and planning improvements to the irrigation system. Section 3 also includes a description of the hydraulic model and the results of the modeling analysis work. Groundwater well condition assessments are also documented in this section. Section 4 presents recommendations for improvements to the system and to the groundwater wells, as well as recommended further study and planning work. 13-1444.407 Page ES-2 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx Existing System The City's irrigation system piping is polyvinyl chloride (PVC), ductile iron (DI), and steel distribution pipes ranging from 3 inches to 24 inches in diameter. Table ES-1 shows a summary of irrigation main sizes in the distribution system. Figure ES-1 shows an overview of the irrigation system. Table ES-1 Irrigation Main Inventory by Size Diameter (inches) Length (ft) Length (miles) < 6 356,347 67.49 6 125,506 23.77 8 80,678 15.28 10 5,122 0.97 12 96,254 18.23 15 8,078 1.53 16 27,878 5.28 18 4,488 0.85 24 483 0.09 Total 711,797 134.81 The oldest parts of the system are approximately 15 to 20 years old, with most of the system constructed less than 10 years ago. Parts of the irrigation system were first acquired by the City in 2002 from Kidwell Farms, Inc., a private irrigation utility owner. This utility was part of subdivisions built by private developers. Supply The City's irrigation system is supplied by groundwater produced from 11 wells located throughout the system and surface water pumped from the Columbia River. All sources of supply pump to the system's main service zone, referred to as the 639 pressure zone. Supply to lower zones is accomplished through the use of pressure-reducing stations. Groundwater Supplies The City's irrigation wells range between 135 and 245 feet deep and are completed in an unconfined alluvial aquifer consisting mainly of sand and gravel. The wells range between 1 and 39 years old. Roughly half of the wells are constructed with perforated casing and the others with stainless steel, wire wrap well screen. The reported production capacities range between 450 and 2,500 gpm. Table ES-2 summarizes the City's irrigation wells. 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G I S \ F I G U R E S \ 1 3 - 1 4 4 4 - 4 0 7 - W A - F I G U R E 2 - 1 . m x d 1 2 / 3 / 2 0 1 3 8 : 4 5 : 3 4 A M D K H §¨¦182 LEGEND UT Existing Storage Tank 3Ú Existing Booster Pump Station (BPS) !Ø Existing Irrigation Well ÍÎ$³Existing Pressure Reducing Valve (PRV) Existing Irrigation Main (Diameter Indicated in Inches) County Line Franklin County Irrigation District (FCID) Irrigation Service Area Pasco City Limits Urban Growth Area Boundary Pressure Zones: River Intake Zone 547 Zone 560 Zone 594 Zone 600 Zone 639 Zone Dry System Boundaries: Broadmoor Estates Broadmoor Place Cole's Estates Desert Oasis Desert Plateau Mediterranean Villas SOURCE: Base Mapping - Franklin County GIS (June 2013) and Benton County GIS (June 2013). Irrigation System Mapping - City of Pasco (April 2013). F R A N K L I N C O U N T Y B E N T O N C O U N T Y 16" CITY OF PASCO £¤12 £¤12 §¨¦182 ´ 1,00001,000 SCALE IN FEET Colu mbi a R i v e r Figure 2-1 13-1444.407 December 2013 ROAD 68 IRRIGATION TANK CAP: 2.28 MG OE: 639 FT ISLAND ESTATES WELL ROAD 108 BPS CAP: 3,000 GPM HARRIS ROAD BPS CAP: 3,125 GPM RIVER INTAKE STATION CAP: 3,000 GPM LINDA LOVIISA WELL I-182 WELL FIRST PLACE WELL DESERT OASIS DESERT ESTATES WELL NORTHWEST COMMONS WELL ROAD 52 WELL POWERLINE WELL DESERT SUNSET WELL VILLAGE AT PASCO HEIGHTS WELL PRV PRVPRV BROADMOOR ESTATES MEDITERRANEAN VILLAS BROADMOOR PLACE COLE'S ESTATES 560 ZONE RIVER INTAKE ZONE 639 ZONE 594 ZONE SIRROCO WELL DESERT PLATEAU 547 ZONE 600 ZONE PRV PRV PRV PRVPRV WEST PASCO EXISTING CITY IRRIGATION SYSTEM City of Pasco Irrigation System Master Plan Figure ES-1 13-1444.407 Page ES-4 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx Table ES-2 Irrigation Well Summary Well Name Year Constructed Depth (BGS1) Pump Type Fixed/ Variable Speed Average Production Rate (gpm2) Motor Size (HP3) Desert Estates 1951 152 Submersible Fixed 650 75 Desert Sunset 1929 202 Vertical Turbine Variable 1,450 150 First Place 2007 123 Vertical Turbine Variable 2,500 350 Island Estates 1976 190 Submersible Fixed 450 50 I-182 Unknown 134 Vertical Turbine Variable 1,850 200 Linda Loviisa 2012 205 Vertical Turbine Fixed 1,100 150 Northwest Commons Unknown 203 Vertical Turbine Variable 1,300 150 Powerline Road 1980 171 Vertical Turbine Fixed 1,900 200 Road 52 2006 185 Vertical Turbine Variable 2,350 250 Sirroco 1976 222 Vertical Turbine Variable 1,400 150 Village of Pasco Heights 1975 184 Submersible Fixed 1,000 125 Notes 1. Below ground surface 2. Gallons per minute 3. Horsepower Surface Water Supplies In addition to groundwater wells, the City uses water pumped from the Columbia River for irrigation supply. The river intake pump station conveys water directly to the Road 108 Booster Pump Station located on the west side of the system. The Road 108 Booster Pump Station pumps the irrigation water to the irrigation distribution system. Irrigation water pumped from the river is metered through a master meter at the Road 108 Booster Pump Station. 13-1444.407 Page ES-5 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx Water Rights Summary The City's current irrigation water rights are a combination of water rights issued by the Washington State Department of Ecology (DOE) and water rights which were given to the City by private parties. The City's annual irrigation water rights total 7,592.9 acre-ft. Table ES-3 shows a summary of the City's existing irrigation water rights. Table ES-3 Irrigation Water Rights Summary Well Name Water Right3 Qi 4 (gpm) Qa 4 (acre-ft) Approximate Pumping Capacity (gpm) First Place G3-01243C 1,400 558.0 2,500 Desert Sunset G3-20243P(B)1 214 107.9 1,450 G3-20243P(C) 1,174 441.6 Island Estates G3-20242C(B) 1,134 504.0 450 Sirocco G3-20243P(B)1 214 107.9 1,450 G3-28452C 450 172.0 Road 52 G3-20242P(A) 1,430 636.0 2,350 Village of Pasco Heights G3-23525C 1,300 660.0 1,000 Northwest Commons G3-20243P(A) 1,612 483.6 1,300 G3-20243P(B)1 214 107.9 Desert Estates G3-24981C(A) 80 41.9 750 G3-24981C(B) 400 155.9 Linda Loviisa G3-20244C2 1,880 759.8 1,000 G3-24978C1 1,600 660.0 G3-26368C1 400 164.0 I-182 G3-24978C1 1,600 660.0 1,850 G3-26368C1 400 164.0 Powerline Road G3-27413P(B) 270 108.1 1,900 G3-27413P(C)1,2 573.75 203.4 G3-27413P(D) 281.25 112.6 G3-27413P(F) 270 108.0 Road 108 Booster Pump Station G3-27413P(C)1,2 573.75 203.4 3,000 S3-28615C 1,643 732.0 S3-28788C 139 56.0 S3-28789C 121 48.0 S3-28790C 195 200.0 S3-28932C 597 240.0 Total Rights 17,164 7,152.8 19,000 Notes 1. Indicates that water right is shared 2. This water right has two points of withdrawal 3. G indicates a groundwater right; S indicates a surface water right. 4. Qi is the instantaneous allowable flow; Qa is the average annual allowable volume 13-1444.407 Page ES-6 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx Storage The irrigation system has one storage tank located near the intersection of Sandifur Parkway and Road 76. The storage tank sets the hydraulic grade for most of the City's system. The storage tank serves the 639 pressure zone by gravity, so the water is able to serve the other pressure zones at lower elevations through pressure-reducing stations. The City currently operates the tank below full at a volume of 2.28 million gallons (MG). Pressure Zones The irrigation system has six pressure zones. The zones are separated by pressure-reducing stations which allow zones with a higher hydraulic grade to supply zones having a lower hydraulic grade with water. Booster Pump Stations The City currently has one booster pump station in its irrigation system. This is the Road 108 Booster Pump Station located at the intersection of Road 108 and Crescent Road in the western portion of the irrigation service area. The design capacity of this station is 3,000 gpm. This station is used to boost water pumped from the Columbia River Intake Station to the 639 Pressure Zone. Another pump station is planned for construction in 2013. This station will be called the Harris Road Booster Pump Station and will be located on Harris Road near Interstate 182. This booster pump station has a design capacity of 3,125 gpm. The station will also pump water supplied by the Columbia River Intake Station to the distribution system. Dry Systems The City's irrigation system includes portions that are installed and ready for use, but not currently used. These systems are referred to as dry systems. The existing dry systems are shown in Figure ES-1. Table ES-4 shows a summary of the current dry systems. Table ES-4 Dry System Summary Subdivision Name Number of New Connections Estimated Acreage (ac) Broadmoor Estates 304 90.67 Broadmoor Place 233 62.33 Desert Oasis 170 54.17 Desert Plateau 304 108.48 Total 1,011 315.65 13-1444.407 Page ES-7 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx Irrigation Water Demands The City typically uses its irrigation system from April to October every year. Production is monitored and recorded by meters on each of the system's wells. Some large users are metered, but most connections to the system are not currently metered. Total system production is the sum of water produced by the irrigation system wells and water pumped from the Columbia River. Figure ES-2 shows total system production from 2006 to 2012. As seen from the figure, system production has increased steadily from 2006 to 2012. Figure ES-2 Total System Production Irrigation System Analysis and Findings The analysis of the irrigation system uses a hydraulic model to simulate pressure and flow conditions in the system under several demand conditions. The results are compared to analysis criteria and form the basis for identifying deficiencies. Hydraulic Model The initial layout of the hydraulic model was completed by tracing pipes and junctions over the City's GIS data. Graphical and tabular data provided by the City were used to locate critical hydraulic elements such as the Road 68 Irrigation Tank, wells, pumps, and pressure- reducing stations. The demands presented in Section 2 were distributed throughout the 3,000 3,513 4,062 4,527 4,765 5,439 5,786 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 2006 2007 2008 2009 2010 2011 2012 To t a l S y s t e m P r o d u c t i o n ( a c r e -ft ) Year 13-1444.407 Page ES-8 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx model using a nearest node method. The nearest node method assigns known demands with a known spatial distribution to the nearest node in the system. Model calibration was completed using data collected by the City's SCADA system. The system collects and logs information from the system every 30 to 60 minutes. Monitoring points on the system include well discharges, booster pump station discharges, and the storage tank. Analysis Criteria The analysis criteria used to evaluate the hydraulic performance of the irrigation system include minimum system pressures and maximum flow velocities. Any result not meeting these criteria is subject to further investigation and potential corrective action. Flow Velocities Pipes whose flow velocities exceed 5 feet per second (fps) under average day demand conditions are considered to have inadequate capacity. Pipe flow velocities are allowed to increase up to 8 fps during peak hour demand (PHD) conditions. Any pipes with flow velocities above 8 fps under PHD conditions are considered to have inadequate capacity. Irrigation System Pressures The City's pressure criteria at service connections are summarized below. These pressure criteria are based on industry standards, Uniform Plumbing Code requirements, and a review of landscape irrigation equipment water pressure requirements. 1. Each service connection should maintain a minimum water pressure of 30 pounds per square inch (psi) during all demand conditions. 2. No service connection should exceed a water pressure of 120 psi. Individual customers are responsible for reducing water pressures over 80 psi if they desire to do so. 3. During a failure of any part of the system, the maximum water pressure at customer meters will not exceed 150 psi. Model and Analysis Findings The calibrated model was used to simulate two scenarios: year 2012 conditions and an anticipated future demand condition. Modeling for the future condition included the City's existing dry systems, but did not include any new pipes or new developments. The results of each analysis are described below. Existing Conditions Existing conditions were modeled using 2012 PHD conditions. Two pipes in the system exceed the flow velocity criteria of 8 fps under PHD conditions. These pipes are 4 inches in diameter and located adjacent to the Sirocco Well discharge. All analysis criteria were 13-1444.407 Page ES-9 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx satisfied with regard to system pressures. The results are summarized below. A graphical summary of modeling results for the existing conditions scenario is shown in Figure ES-3.  The system does not experience pressures over 120 psi under any demand condition. In order to verify that maximum allowable pressures were not exceeded, a low- demand condition was used to approximate static conditions.  The system experiences pressures over 80 psi near discharges for wells and the Road 108 Booster Pump Station during high production. None of the locations which experience pressures between 80 and 120 psi serve customers. They are typically located on dedicated transmission mains and are caused by topography.  Low system pressures were not predicted by the model under this scenario during normal tank levels. If the storage tank water surface elevation reaches 600 feet above mean sea level (AMSL), the system begins to experience isolated low pressures.  No part of the system experiences pressures over 150 psi during a failure of pressure- reducing valves. It is possible that pumps could fail in such a manner as to cause high system pressures downstream of their discharges. Future Conditions The calibrated model was used to predict the hydraulic performance of the City's irrigation system under anticipated future conditions. The future condition assumptions are:  All of the City's current dry systems are connected and in use  All of the City's existing subdivisions are fully developed  All of the City's sources are producing the maximum allowed flows simultaneously These assumptions represent near-term conditions that could occur within the next two to five years. The actual timing of these conditions is dependent on a number of variables. Any changes in the following conditions would alter the analysis results:  Expansion of the irrigation system service area beyond assumed service limits  Additional sources of supply  Changes in water rights High system pressures were found near the discharges of wells and pump stations as in the 2012 PHD scenario. No pipes that serve customers directly experienced high pressures. No low system pressures were found by the model. High flow velocities were found by the model at two locations:  Near the discharge of the Sirocco Well as observed in the 2012 PHD scenario  North of the intersection of Road 52 and Sandifur Parkway A graphical summary of modeling results for the future conditions scenario is shown in Figure ES-4. 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S \ 1 3 - 1 4 4 4 - 4 0 7 - W A - F I G U R E 3 - 1 . m x d 1 2 / 3 / 2 0 1 3 8 : 4 9 : 2 0 A M D K H §¨¦182 LEGEND UT Existing Storage Tank 3Ú Existing Booster Pump Station (BPS) !Ø Existing Irrigation Well ÍÎ$³Existing Pressure Reducing Valve (PRV) Existing Irrigation Main (Diameter Indicated in Inches) County Line Franklin County Irrigation District (FCID) Irrigation Service Area Pasco City Limits Urban Growth Area Boundary Pressure Between 80 PSI and 120 PSI Flow Velocity Greater Than 8 FT/S SOURCE: Base Mapping - Franklin County GIS (June 2013) and Benton County GIS (June 2013). Irrigation System Mapping - City of Pasco (April 2013). F R A N K L I N C O U N T Y B E N T O N C O U N T Y 16" CITY OF PASCO £¤12 £¤12 §¨¦182 ´ 1,00001,000 SCALE IN FEET Colu mbia R iver Figure 3-1 13-1444.407 December 2013 ROAD 68 IRRIGATION TANK CAP: 2.28 MG OE: 639 FT ISLAND ESTATES WELL ROAD 108 BPS CAP: 3,000 GPM HARRIS ROAD BPS CAP: 3,125 GPM RIVER INTAKE STATION CAP: 3,000 GPM LINDA LOVIISA WELL I-182 WELL FIRST PLACE WELL DESERT ESTATES WELL NORTHWEST COMMONS WELL ROAD 52 WELL POWERLINE WELL DESERT SUNSET WELL VILLAGE AT PASCO HEIGHTS WELL PRV PRVPRV SIRROCO WELL PRV PRV PRV PRVPRV WEST PASCO HYDRAULIC MODELING RESULTS FOR EXISTING CONDITIONS City of Pasco Irrigation System Master Plan HIGH FLOW VELOCITY NEAR SIRROCO WELL Figure ES-3 ÍÎ$³ÍÎ$³ ÍÎ$³ ÍÎ$³ ÍÎ$³ ÍÎ$³ÍÎ$³ ÍÎ$³ !Ø !Ø !Ø !Ø !Ø !Ø !Ø !Ø !Ø !Ø !Ø 3Ú 3Ú 3Ú UT 24'' 18 ' ' 12 ' ' 2' ' 4 ' ' 3'' 8'' 6'' 16'' 1 0'' 8' ' 4'' 4'' 8'' 1 6'' 10'' 12'' 8' ' 4'' 8' ' 4'' 4'' 4'' 8'' 4'' 6'' 4'' 4'' 12'' 4 '' 12'' 4'' 3'' 12'' 4'' 6'' 12'' 1 2'' 8'' 4'' 4'' 6'' 4'' 12'' 4' ' 6'' 12'' 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Inches) County Line Franklin County Irrigation District (FCID) Irrigation Service Area Pasco City Limits Urban Growth Area Boundary Pressure Between 80 PSI and 120 PSI Flow Velocity Greater Than 8 FT/S SOURCE: Base Mapping - Franklin County GIS (June 2013) and Benton County GIS (June 2013). Irrigation System Mapping - City of Pasco (April 2013). F R A N K L I N C O U N T Y B E N T O N C O U N T Y 16" CITY OF PASCO £¤12 £¤12 §¨¦182 ´ 1,00001,000 SCALE IN FEET Colu mbia R iver Figure 3-2 13-1444.407 December 2013 ROAD 68 IRRIGATION TANK CAP: 2.28 MG OE: 639 FT ISLAND ESTATES WELL ROAD 108 BPS CAP: 3,000 GPM HARRIS ROAD BPS CAP: 3,125 GPM RIVER INTAKE STATION CAP: 3,000 GPM LINDA LOVIISA WELL I-182 WELL FIRST PLACE WELL DESERT ESTATES WELL NORTHWEST COMMONS WELL ROAD 52 WELL POWERLINE WELL DESERT SUNSET WELL VILLAGE AT PASCO HEIGHTS WELL PRV PRVPRV SIRROCO WELL PRV PRV PRV PRVPRV WEST PASCO HYDRAULIC MODELING RESULTS FOR FUTURE CONDITIONS City of Pasco Irrigation System Master Plan HIGH FLOW VELOCITY NEAR SIRROCO WELL Figure ES-4 13-1444.407 Page ES-12 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx Storage Analysis The system storage was evaluated at projected peak hour demand conditions to determine whether or not enough storage is available in the system. The analysis concluded that the existing irrigation system reservoir has adequate capacity to meet projected storage needs as long as the water level in the tank is raised. Modeling confirmed that raising the water level does not have any adverse impacts on the distribution system. Well Condition Assessment A tabletop condition assessment of the City's groundwater supply wells was completed as part of this plan. The assessment consisted of gathering and analyzing available information. The objective of this analysis is to identify wells having apparent construction, performance, or water quality issues that may be limiting production with the purpose of developing a targeted approach at candidate wells to regain performance and optimize individual and combined system production. The results of the well condition assessments are summarized as follows:  Review of available information for the Desert Sunset, Sirocco, NW Commons, Island Estates, I-182, and Powerline Road wells indicated the presence of biofouling and incrustation which are possibly plugging screens and perforations. Significant accumulations of sediment or debris in the wells are also noted.  Observations indicated minor mineral and biological deposits within the First Place and Desert Estates wells.  Based on the information provided and relatively newer construction, the apparent conditions of the Road 52 and Linda Loviisa Wells are considered good. Recommendations Recommendations for improvements to wells, improvements to the irrigation system, and opportunities for further planning and study were developed as part of this report. The recommendations are separated into near-term improvements and long-term improvements. Near-term improvements are those which should be completed within the next one to five years. Long-term improvements should be completed in six to twenty years. The recommended capital improvement program totals approximately $800,000 for near- term improvements. The sum of recommended budget for long-term improvements is $6.87 million and does not include the $800,000 of near-term recommended investment. Table ES- 5 shows a summary of the recommended capital improvement budgets. Tables ES-6 and ES- 7 include tabulated summaries of all recommended improvements and their associated estimated project costs. 13-1444.407 Page ES-13 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx Table ES-5 Recommended Capital Improvement Budget Summary Near-Term $800,000 Long-Term $6,867,000 Total $7,667,000 13-1444.407 Page ES-14 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx Table ES-6 Near-Term Capital Improvement Program Summary Group ID Project Location or Name Project Limits Project Description Estimated Project Cost Di s t r i b u t i o n S y s t e m I m p r o v e m e n t s IR.2 Powerline Road Road 56 to Road 52 Extend existing 16-inch diameter main east to Road 52. The new main may be built in right of way that is being platted as part of the construction of a new elementary school at the intersection. $186,000 IR.4 Sahara Drive West along Sahara Drive from end of existing mains to Road 44 Extend two 4-inch diameter distribution mains on Sahara Drive west to the existing 12-inch diameter main on Road 44. This improvement provides a redundant connection to the rest of the system if the connection at Burden Boulevard is out of service for any reason. $46,000 IR.5 Sirocco Drive Sahara Drive to Saguaro Drive Install approximately 1,200 linear feet of new 6-inch diameter distribution piping near the discharge of the Sirocco Well. The new pipes should be installed in public right of way. The existing pipes should be abandoned to eliminate pipe crossings in the rear of private lots. $90,000 D.2 Isolation Valve Improvements Phase 1 Island Estates and Sunny Meadows Subdivisions Installation of up to 52 isolation valves in public right of way will reduce the need for City staff to access back yards during maintenance and repairs and allow more customers to stay online during emergencies. $156,000 D.3 Isolation Valve Improvements Phase 2 Interstate Highway 182 Crossing Installation of two isolation valves in the vicinity of the crossing may help to prevent complete shutdown of the crossing during maintenance and repair activities. $10,000 D.4 Northwest Commons Pivot Improvements Northwest Commons Subdivision This improvement would tie the Northwest Commons irrigation pivot directly to the irrigation system and meter the pivot at the point of withdrawal. This will allow the City to operate the Northwest Commons Well independently of the pivot. Proposed pipe is 8 inches in diameter. $30,0001 Dr y Sy s t e m s DS Activate Dry Systems - This improvement is an operational improvement that consists of activating the portions of the City's irrigation system which are currently not in use.2 - 13-1444.407 Page ES-15 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx Table ES-6 Near-Term Capital Improvement Program Summary (continued) Group ID Project Location or Name Project Limits Project Description Estimated Project Cost So u r c e a n d St o r a g e Im p r o v e m e n t s S.1 Road 68 Irrigation Tank Improvements - This improvement proposes to change the maximum water level in the Road 68 Irrigation Tank from 639 to 641.5. It is an operational change and requires no capital investment. This project also includes inspection and repair or replace level sensing equipment inside the Road 68 Irrigation Tank. $10,000 S.2 Irrigation Well Rehabilitation Program - Rehabilitation and data acquisition on all wells except Village at Pasco Heights Well.3 $220,000 Pl a n n i n g a n d S t u d i e s P.1 Freshwater Mussel Study - Conduct a study to determine the most effective way to address freshwater mussel colonization of distribution piping exposed to Columbia River Water. $25,000 P.2 Linda Loviisa Well Field Study - Conduct a well field study in order to determine the optimal locations and sizes of new irrigation wells in the Linda Loviisa area. $24,000 P.3 Data Acquisition on Existing Wells - This recommendation consists of gathering data consistent with Table 4-3 as presented in Section 4. The City has resources to accomplish this project so there is no project cost. - Total Budget Recommended for all Near-Term Capital Improvements $797,000 Notes 1. For cost estimating purposes, 200 linear feet of 6-inch diameter PVC was assumed and $15,000 was added for installation of a new meter and valves. 2. See Figure 2-1 for the location of the City's existing dry systems. 3. See text for detailed description of rehabilitation activities and wells involved. 13-1444.407 Page ES-16 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx Table ES-7 Long-Term Capital Improvement Program Summary Group ID Project Location or Name Project Limits Project Description Estimated Project Cost Di s t r i b u t i o n S y s t e m I m p r o v e m e n t s IR.1 Powerline Road Road 90 to Convention Drive Extend existing 16-inch diameter main west to Road 90 to improve flow and eliminate dead ends. $1,000,000 IR.3 Sandifur Parkway and Road 44 Porto Lane to Burden Boulevard Extend existing dead-end 8-inch diameter main on Sandifur Parkway near Porto Lane along east side of Road 44 south to Burden Boulevard. Connect all dead-end distribution mains along Road 44 to the new main. $325,000 IR.6 Wrigley Drive Road 68 east to Convention Drive Installation of a 12-inch diameter main between existing distribution mains on Road 68 and Convention Drive. This improvement requires additional right-of-way. $212,500 D.1 600 Zone PRV Supply 600 Zone This improvement proposes installation of a redundant 12-inch diameter source of supply to the 600 Zone. The ultimate size and routing of the pipe and source zone would be chosen by the City at a later time once right of way, easements, or land can be acquired between the two zones. $915,0001 Te l e m e t r y Im p r o v e m e n t s T.1 Road 52 Telemetry Improvements Road 52 This improvement proposes installation of a signal converting station to improve communications from the central telemetry system to the Powerline Road Well, Road 52 Well, and Northwest Commons Well. $35,000 So u r c e Im p r o v e m e n t s S.3 Village at Pasco Heights Well Replacement Village at Pasco Heights Construction of a new well at Village of Pasco Heights. This project assumes that the existing pump and motor will be reused. $173,000 S.4 Well Houses - Construction of well houses to enclose existing wells and associated equipment. It is assumed that a total of seven well houses will be built at a project cost of $65,000 per well house. $455,000 13-1444.407 Page ES-17 Irrigation System Master Plan December 2013 Executive Summary City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 0 - Executive Summary.docx Table ES-7 Long-Term Capital Improvement Program Summary (continued) Group ID Project Location or Name Project Limits Project Description Estimated Project Cost So u r c e Im p r o v e m e n t s S.5 Construction of New Irrigation Wells - Up to six new irrigation wells could be necessary to improve the irrigation system capacity. For budgeting purposes, a project cost of $616,000 per well has been assumed.2 $3,696,0003 Pl a n n i n g a n d St u d i e s P.4 Rate Study - Conduct a rate study to see if irrigation system rates are adequate. The rate study will be informed by the selection of a capital improvements program. $25,000 P.5 Irrigation System Master Plan Update - Update of this irrigation system master plan following major changes to the irrigation system or after five years, whichever occurs first. $30,000 Total Budget Recommended for all Long-Term Capital Improvements $6,867,000 Notes 1. For cost estimating purposes, 6,500 linear feet of 12-inch diameter PVC was assumed and $100,000 was added for a pressure-reducing station. 2. The location of new wells will depend on data acquisition and the Linda Loviisa well field study. 3. The project cost is $616,000 per new irrigation well. With a total of six wells, the total project cost is $3.70 million. I t is possible that fewer than six new wells will be necessary. SECTION 1 13-1444.407 Page 1-1 Irrigation System Master Plan December 2013 Introduction City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 1 - Introduction.docx SECTION 1 INTRODUCTION Authorization On June 4, 2013, Murray, Smith & Associates, Inc. (MSA) was authorized by the City of Pasco (City) to prepare this plan. Background The City of Pasco owns and operates domestic and irrigation water utilities that provides water to residential customers and a limited number of commercial customers. Providing a system for irrigation water separate from the potable water utility allows the City's customers to avoid using treated drinking water to irrigate. The City's existing irrigation system is supplied by water from 11 groundwater wells and water pumped from the Columbia River. The City acquired the first portions of the system in 2002 from a private irrigation utility. The system has grown considerably since that time. The City uses the irrigation system annually from April 1st to October 31st. The City has established the goal of developing a capital improvements plan for the irrigation system to ensure the continued delivery of economical irrigation water to City residents. Purpose and Scope The purpose of this plan is to provide a basis for identifying, analyzing, and planning capital improvements to the irrigation system. The study includes a hydraulic analysis of the existing system which compares the existing system's performance to analysis criteria in order to identify deficiencies and develop system improvements. A capital improvements plan is developed to assist in planning future projects. Included with this plan are conceptual level project cost estimates. The system's existing groundwater wells will also be evaluated through a tabletop review of existing data. The results of this review will be used to develop preliminary recommendations for improvements, further assessment, and rehabilitation work. Irrigation System Plan Overview This plan is organized by sections. Section 2 presents an inventory of the irrigation system and its components as they currently exist and operate. The City's irrigation water rights are also discussed in Section 2. Section 3 presents analysis criteria that form the basis for identifying deficiencies in system performance and planning improvements to the irrigation system. Section 3 also includes a description of the hydraulic model and the results of the modeling analysis work. Groundwater well condition assessments are also documented in this section. Section 4 presents recommendations for improvements to the system and to the groundwater wells, as well as recommended further study and planning work. SECTION 2 13-1444.407 Page 2-1 Irrigation System Master Plan December 2013 Existing System City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 2 - Existing System.docx SECTION 2 EXISTING SYSTEM Introduction This section describes the City's existing irrigation system's supply, storage, and distribution facilities. Water rights and historical production and demand data are presented. General operations are also discussed in this section. The information in this section forms the basis for building the hydraulic model and for developing the recommendations which result from analysis of the irrigation system. Existing Irrigation System The City's irrigation system piping is polyvinyl chloride (PVC), ductile iron (DI), and steel distribution pipes ranging from 3 inches to 24 inches in diameter. Table 2-1 shows a summary of irrigation main sizes in the distribution system. Table 2-1 Irrigation Main Inventory by Size Diameter (inches) Length (ft) Length (miles) < 6 356,347 67.49 6 125,506 23.77 8 80,678 15.28 10 5,122 0.97 12 96,254 18.23 15 8,078 1.53 16 27,878 5.28 18 4,488 0.85 24 483 0.09 Total 711,797 134.81 The oldest parts of the system are approximately 15 to 20 years old, with most of the system constructed less than 10 years ago. Parts of the irrigation system were first acquired by the City in 2002 from Kidwell Farms, Inc., a private irrigation utility owner. This utility was part of subdivisions built by private developers. The system has six pressure zones. The largest is the 639 pressure zone. All of the system's sources of supply and storage are located in this zone. The other five zones have a lower hydraulic grade line (HGL) and are supplied from the 639 pressure zone through pressure- reducing valves. Figure 2-1 shows an overview of the existing system. Figure 2-2 shows a hydraulic profile of the system. 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FRA N K L I N CO UN T Y B E NT O N CO UN T Y 16 " CI T Y O F P A S C O £¤12 £¤12§¨¦182 ´ 1, 0 0 0 0 1 , 0 0 0 SC A L E I N F E E T Col u mbi a R ive r Figure 2-1 13-1444.407December 2013 RO A D 6 8 IR R I G A T I O N T A N K CA P : 2 . 2 8 M G OE : 6 3 9 F T IS L A N D E S T A T E S WE L L RO A D 1 0 8 B P S CA P : 3 , 0 0 0 G P M HA R R I S R O A D B P S CA P : 3 , 1 2 5 G P M RI V E R I N T A K E ST A T I O N CA P : 3 , 0 0 0 G P M LINDA LOVIISA WELL I-182 WELLFIRST PLACE WELLDESERTOASISDESERTESTATESWELLNORTHWESTCOMMONSWELLROAD 52 WELLPOWERLINEWELL DESERT SUNSET WELL VILLAGE AT PASCO HEIGHTS WELL PRV PR V PR V BR O A D M O O R ES T A T E S ME D I T E R R A N E A N VI L L A S BR O A D M O O R PL A C E CO L E ' S E S T A T E S 56 0 Z O N E RI V E R I N T A K E ZO N E 639 ZONE 594 ZONE SIRROCO WELL DESERT PLATEAU 547 ZONE 60 0 Z O N E PRVPRVPRVPRVPRV WE S T P A S C O EXISTING CITY IRRIGATION SYSTEMCity of Pasco Irrigation System Master Plan WEST EAST 560 ZONE OE = 660.0' 300 400 500 600 P 600 ZONE P P P P P P P P P P P 547 ZONE 639 ZONE 700 300 400 500 600 700 P 594 ZONE RIVER INTAKE ZONE P P &GEGODGT Ä (+)74'Ä ':+56+0)+44+)#6+10 5;56'/*;&4#7.+% 241(+.' 13-1444.407 Page 2-4 Irrigation System Master Plan December 2013 Existing System City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 2 - Existing System.docx Supply The City's irrigation system is supplied by groundwater produced from 11 wells located throughout the system and surface water pumped from the Columbia River. All sources of supply pump to the system's main service zone, referred to as the 639 pressure zone. Supply to lower zones is accomplished through the use of pressure-reducing stations. Groundwater Supplies The City's irrigation wells range between 135 and 245 feet deep and are completed in an unconfined alluvial aquifer consisting mainly of sand and gravel. The wells range between 1 and 39 years old. Roughly half of the wells are constructed with perforated casing and the others with stainless steel, wire wrap well screen. The reported production capacities range between 450 and 2,500 gpm. Table 2-2 summarizes the City's irrigation wells. Most of the City's irrigation wells are located on concrete pads and are open to the atmosphere with nearby electrical equipment in weatherproof enclosures. The Desert Sunset and Sirocco Wells are enclosed within buildings. The City has current capital improvement projects planned to construct new well houses around the First Place Well and the Linda Loviisa Well. The construction of these well houses is intended to prevent damage to equipment from exposure and reduce noise levels to nearby properties when the pumps are operating. None of the wells have backup power supply. Surface Water Supplies In addition to groundwater wells, the City uses water pumped from the Columbia River for irrigation supply. The river intake pump station conveys water directly to the Road 108 Booster Pump Station located on the west side of the system. The Road 108 Booster Pump Station pumps the irrigation water to the irrigation distribution system. Irrigation water pumped from the river is metered through a master meter at the Road 108 Booster Pump Station. Since there are no services between these two stations, all of the water pumped is metered prior to distribution and use. Water Rights Summary The City's current irrigation water rights are a combination of water rights issued by the Washington State Department of Ecology (DOE) and water rights which were given to the City by private parties. The City's annual irrigation water rights total 7,592.9 acre-ft. Table 2-3 shows a summary of the City's existing irrigation water rights. Storage The irrigation system has one storage tank located near the intersection of Sandifur Parkway and Road 76. The storage tank sets the hydraulic grade for most of the City's system. The 13-1444.407 Page 2-5 Irrigation System Master Plan December 2013 Existing System City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 2 - Existing System.docx storage tank serves the 639 pressure zone by gravity, so the water is able to serve the other pressure zones at lower elevations through pressure-reducing stations. Table 2-2 Irrigation Well Summary Well Name Year Constructed Depth (BGS1) Pump Type Fixed/ Variable Speed Average Production Rate (gpm2) Motor Size (HP3) Desert Estates 1951 152 Submersible Fixed 650 75 Desert Sunset 1929 202 Vertical Turbine Variable 1,450 150 First Place 2007 123 Vertical Turbine Variable 2,500 350 Island Estates 1976 190 Submersible Fixed 450 50 I-182 Unknown 134 Vertical Turbine Variable 1,850 200 Linda Loviisa 2012 205 Vertical Turbine Fixed 1,100 150 Northwest Commons Unknown 203 Vertical Turbine Variable 1,300 150 Powerline Road 1980 171 Vertical Turbine Fixed 1,900 200 Road 52 2006 185 Vertical Turbine Variable 2,350 250 Sirroco 1976 222 Vertical Turbine Variable 1,400 150 Village of Pasco Heights 1975 184 Submersible Fixed 1,000 125 Notes 1. Below ground surface 2. Gallons per minute 3. Horsepower The storage tank is referred to as the Road 68 Irrigation Tank. Construction of the tank was completed in 1992 and it was originally used as a potable water storage tank. The tank was repurposed for use in the irrigation system in 2006. The tank is a welded steel standpipe with an approximate volume of 2.62 million gallons (MG) when full. The City currently operates the tank below full at a volume of 2.28 MG. The tank has a diameter of about 55 feet and the current water storage height is 126.5 feet which corresponds to an elevation of 639 feet above mean sea level (AMSL). The maximum water storage height is 147.5 feet or 660 feet AMSL. The tank has approximately 18,000 gallons of storage per vertical foot of storage 13-1444.407 Page 2-6 Irrigation System Master Plan December 2013 Existing System City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 2 - Existing System.docx height. The tank is equipped with an impressed current cathodic protection system. It was fully recoated in 2008. Table 2-3 Irrigation Water Rights Summary Well Name Water Right3 Qi 4 (gpm) Qa 4 (acre-ft) Approximate Pumping Capacity (gpm) First Place G3-01243C 1,400 558.0 2,500 Desert Sunset G3-20243P(B)1 214 107.9 1,450 G3-20243P(C) 1,174 441.6 Island Estates G3-20242C(B) 1,134 504.0 450 Sirocco G3-20243P(B)1 214 107.9 1,450 G3-28452C 450 172.0 Road 52 G3-20242P(A) 1,430 636.0 2,350 Village of Pasco Heights G3-23525C 1,300 660.0 1,000 Northwest Commons G3-20243P(A) 1,612 483.6 1,300 G3-20243P(B)1 214 107.9 Desert Estates G3-24981C(A) 80 41.9 750 G3-24981C(B) 400 155.9 Linda Loviisa G3-20244C2 1,880 759.8 1,000 G3-24978C1 1,600 660.0 G3-26368C1 400 164.0 I-182 G3-24978C1 1,600 660.0 1,850 G3-26368C1 400 164.0 Powerline Road G3-27413P(B) 270 108.1 1,900 G3-27413P(C)1,2 573.75 203.4 G3-27413P(D) 281.25 112.6 G3-27413P(F) 270 108.0 Road 108 Booster Pump Station G3-27413P(C)1,2 573.75 203.4 3,000 S3-28615C 1,643 732.0 S3-28788C 139 56.0 S3-28789C 121 48.0 S3-28790C 195 200.0 S3-28932C 597 240.0 Total Rights 17,164 7,152.8 19,000 Notes 1. Indicates that water right is shared 2. This water right has two points of withdrawal 3. G indicates a groundwater right; S indicates a surface water right. 4. Qi is the instantaneous allowable flow; Qa is the average annual allowable volume 13-1444.407 Page 2-7 Irrigation System Master Plan December 2013 Existing System City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 2 - Existing System.docx Distribution The distribution system consists of pipe ranging from 3 inches in diameter to 24 inches in diameter. The majority of the system piping is PVC with parts of the system in ductile iron (DI) or steel. Pressure Zones The irrigation system has six pressure zones. The zones are separated by pressure-reducing stations which allow zones with a higher hydraulic grade to supply zones having a lower hydraulic grade with water. Table 2-4 summarizes the pressure zones. Table 2-4 Pressure Zone Summary Zone Name Maximum Hydraulic Grade (ft AMSL) Storage Facilities Supply Facilities General Location or Service Area 639 639 Road 68 Irrigation Tank All groundwater wells Main portion of irrigation system 600 600 No storage facilities No supply facilities Chapel Hill subdivision 594 594 No storage facilities No supply facilities Desert Estates subdivision 560 560 No storage facilities No supply facilities Loviisa Farms 547 547 No storage facilities No supply facilities First Place subdivision River Intake 549 No storage facilities Columbia River Intake Station Intake near I-182 bridge over Columbia Booster Pump Stations The City currently has one booster pump station in its irrigation system. This is the Road 108 Booster Pump Station located at the intersection of Road 108 and Crescent Road in the western portion of the irrigation service area. The design capacity of this station is 3,000 gpm. This station is used to boost water pumped from the Columbia River Intake Station to the 639 Pressure Zone. Another pump station is planned for construction in 2013. This station will be called the Harris Road Booster Pump Station and will be located on Harris Road near Interstate 182. This booster pump station has a design capacity of 3,125 gpm. The station will also pump water supplied by the Columbia River Intake Station to the distribution system. 13-1444.407 Page 2-8 Irrigation System Master Plan December 2013 Existing System City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 2 - Existing System.docx Dry Systems The City's irrigation system includes portions that are installed and ready for use, but not currently used. These systems are referred to as dry systems. The existing dry systems are shown in Figure 2-1. Table 2-5 shows a summary of the current dry systems. Table 2-5 Dry System Summary Subdivision Name Number of New Connections Estimated Acreage (ac) Broadmoor Estates 304 90.67 Broadmoor Place 233 62.33 Desert Oasis 170 54.17 Desert Plateau 304 108.48 Total 1,011 315.65 Interties to Other Systems The irrigation system is not connected to any other irrigation or water distribution systems. The irrigation system was formerly connected to the City's potable water distribution system through a backflow prevention device. The City completely removed the connection in 2006. Irrigation System Demands This section presents information on irrigation water production and demands. The City typically uses its irrigation system from April to October every year. Production is monitored and recorded by meters on each of the system's wells. Some large users are metered, but most connections to the system are not currently metered. Production Records Total system production is the sum of water produced by the irrigation system wells and water pumped from the Columbia River. Figure 2-3 shows total system production from 2006 to 2012. As seen from the figure, system production has increased steadily from 2006 to 2012. The City performed two studies related to water use: one in 2001 and one in 2007. The study from 2001 includes information cited in this report on irrigation water use for public facilities and agriculture. The 2007 study contains more recent data on residential irrigation water usage which are also used in this report. Overall System Usage Historical production data was used to calculate overall system usage and peaking factors. The City has collected hourly data on all of its source meters and its storage tank for the past 13-1444.407 Page 2-9 Irrigation System Master Plan December 2013 Existing System City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 2 - Existing System.docx three years. This data was used to analyze variations in demand and to develop the average day demand (ADD), maximum day demand (MDD), and peak hour demand (PHD). The results of this analysis are shown in Table 2-6. Figure 2-3 Total System Production Table 2-6 Peaking Factor Summary Year 2012 2011 2010 Total System Production (MG) 1,885.28 1,722.40 1,552.61 Average Day Demand gpm 6,118 5,572 5,038 mgd 8.810 8.282 7.255 Maximum Day Demand gpm 9,700 8,487 9,704 mgd 13.968 12.221 13.973 Date 8/8/2012 8/2/2011 8/8/2010 Peak Hour Demand gpm 17,529 15,116 16,077 mgd 25.241 21.767 23.151 Hour 6:00 AM 10:00 AM 6:00 AM MDD/ADD (Average: 1.662) 1.586 1.476 1.926 PHD/MDD (Average: 1.748) 1.807 1.781 1.657 PHD/ADD (Average: 2.895) 2.865 2.628 3.191 3,000 3,513 4,062 4,527 4,765 5,439 5,786 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 2006 2007 2008 2009 2010 2011 2012 To t a l S y s t e m P r o d u c t i o n ( a c r e -ft ) Year 13-1444.407 Page 2-10 Irrigation System Master Plan December 2013 Existing System City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 2 - Existing System.docx The irrigation system has grown since the City began acquiring the system in 2002. The City classifies connections to the system as either residential, billed on a flat fee basis, or connections for customers billed by the acre. These larger accounts are typically commercial irrigation customers and include public schools, parks, apartment complexes, and sports facilities. Table 2-7 shows the number of connections to the system each year. Table 2-7 Irrigation System Connections Summary Year Residential Connections Customers Billed by Acre 2006 2,964 - 2007 3,351 - 2008 4,053 - 2009 4,403 - 2010 4,812 - 2011 5,159 22 2012 5,379 23 2013 5,434 25 Production has kept uniform pace with the number of connections to the system on an annual basis. Since 2006, the production per residential connection to the system has remained relatively constant at 1,575 gallons per day per connection per year. Residential Demands The City does not meter water use on residential connections to the irrigation system. Residential irrigation use varies widely across the City's service area and is dependent on economic factors, maturity of the landscaping, and whether or not the property is irrigated using domestic or irrigation water. The City studied residential water use patterns in a 2007 memorandum and determined that residential irrigation usage averages 3.18 acre-ft per gross acre per year or 5.31 acre-ft per irrigated acre per year. The memorandum is attached as Appendix B. Commercial Demands Commercial users of the City's irrigation system include public schools and the City of Pasco Department of Parks and Recreation. Irrigated facilities include a soccer complex, a track facility, a softball complex, and five residential City parks. The soccer complex is metered. Commercial irrigation usage varies according to the facility. City park use varied from 19 gallons per square foot to 34 gallons per square foot. Water use at the athletic facilities averaged 40 gallons per square foot which is higher than the rest of the system. 13-1444.407 Page 2-11 Irrigation System Master Plan December 2013 Existing System City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 2 - Existing System.docx Agricultural Demands The City of Pasco supplies irrigation water to three pivots from its system. Crops which are commonly grown at the three sites vary annually and include wheat, alfalfa, and potatoes. The pivots and land are not owned by the City. They include:  A single pivot located at Linda Loviisa Farms  A single pivot near the Northwest Commons Well  A single pivot north of Powerline Road near the Powerline Well All of the pivots are served directly by the system except for the pivot at the Northwest Commons Well. The Northwest Commons pivot may only run when the Northwest Commons Well is operating. Each pivot connection is metered. Pivot acreages were calculated by scaling aerial photo maps. An annual demand of 3.30 acre-ft per acre was used to estimate the annual water usage of each of these pivots. This estimated demand was calculated as part of a water usage study prepared by the City in 2001. Table 2-8 shows a summary of the agricultural demands. Table 2-8 Summary of Agricultural Demands Pivot Instantaneous Demand (gpm) Estimated Irrigated Acreage (acres) Estimated Annual Usage (acre-ft) Powerline Road 380 125.7 414.8 Linda Loviisa 580 72.1 237.9 Northwest Commons 560 73.5 242.6 Total 1,520 271.3 895.3 General Operating Procedures City staff use a process referred to as staging to operate the irrigation system. In each stage, various wells or combinations of wells are selected for production. Each stage includes more pumps than the previous stage. When an additional pump is called to operate, it is referred to as a step up. When a pump is called to stop, it is called a step down. The system uses a delay between stepping up or stepping down to minimize pump cycling and prevent dramatic increases or decreases in pressure and flow. The order of pumps is chosen by the operator and varies on a regular schedule. The maximum number of stages is set by the operator and varies up to 11, which is the number of well pumps in the system. The system has the ability to operate manually or automatically via a master telemetry unit. Under automatic control, pumps are called to operate based on signals from pressure sensors within the system. The Island Estates Well, Sirocco Well, I-182 Well, and Desert Sunset 13-1444.407 Page 2-12 Irrigation System Master Plan December 2013 Existing System City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 2 - Existing System.docx Well are equipped with pressure sensors that communicate with the telemetry system. If a low pressure is registered at any of these sites and lasts for 30 seconds, a new pump is called to operate. This is called a low pressure step-up. When a pressure sensor sends a high pressure alarm that lasts for 10 seconds, the stage will step down. This is called a high pressure step-down. When the tank level is low, the stage is stepped up. This is referred to as a low tank level step-up. As long as the level remains low, additional pumps will be called to operate until the level rises above the low tank set point or the maximum stage is reached. If there is a high tank level signal, the stage is stepped down until the tank level falls below the high tank set point. Water Quality Water for the irrigation system is not treated. Available water quality data is attached in Appendix A. Agreements with Kidwell Farms, Inc. The City supplies irrigation water to three sites owned by Kidwell Farms, Inc. The three sites are the Northwest Commons subdivision, the Linda Loviisa Subdivision, and land leased from the Washington State Department of Natural Resources in Section 16, T-9-N, R- 29-E. The City leases use of the Northwest Commons Well for an annual flat fee. The other pivots are connected to the system and a flat fee is paid to the City by Kidwell Farms for the connection. The fee varies by site and Kidwell Farms agrees to pay all maintenance and electrical costs associated with its use of the City facilities. Rate Schedule The City bills most of its customers based on a flat fee for connection to the irrigation system. Some large users are billed by the number of irrigated acres. Some users are billed by an irrigation unit which is defined as 5,000 square feet of irrigated area. The City's rate schedule and fees associated with the irrigation utility are summarized in Table 2-9. Summary This section presented information on the existing irrigation system including sources of supply, storage facilities, and the distribution system. Current demand data and trends were documented. General operation of the system was explained and the irrigation rates charged to customers are shown. The next section will present the hydraulic analysis of the irrigation system and the well condition assessments. Findings from each of these analyses will be discussed. 13-1444.407 Page 2-13 Irrigation System Master Plan December 2013 Existing System City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 2 - Existing System.docx Table 2-9 Irrigation Utility Fees and Rates Summary Irrigation Service Type Fee/Charge Reference Irrigation water service; monthly rate during irrigation season: Base rate per unit for single-family residential properties $26.00 13.61.190(A) Base rate per unit for non-single-family residential property $26.00 13.61.190(B) Per irrigation unit $8.12 13.61.190(C) Per irrigated acre (public parks, playgrounds, and open spaces) $75.81 13.61.190(D) Unauthorized turn-on (any repair cost additional) $50.00 13.61.090 Disconnect/connect service due to violation $50.00 13.61.100 Annual system availability fee $88.00 16.61.060 SECTION 3 13-1444.407 Page 3-1 Irrigation System Master Plan December 2013 Criteria, Analysis, and Findings City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 3 - Analysis and Findings.docx SECTION 3 CRITERIA, ANALYSIS, AND FINDINGS Introduction Section 3 presents a hydraulic analysis of the City's irrigation system and an assessment of the City's irrigation wells. The irrigation system analysis criteria include pressure, flow velocity, and storage criteria. A description of the analyses and associated findings are also presented. Irrigation System Analysis This section describes analysis of the irrigation system which uses a hydraulic model to simulate pressure and flow conditions in the system under several demand conditions. Model Layout The initial layout of the hydraulic model was completed by tracing pipes and junctions over the City's GIS data. Graphical and tabular data provided by the City were used to locate critical hydraulic elements such as the Road 68 Irrigation Tank, wells, pumps, and pressure reducing stations. Once initial layout was completed, the irrigation piping system was then skeletonized to simplify the layout and increase modeling efficiency. Skeletonization is a process that consolidates multiple real pipes into hydraulically equivalent single pipes. For this model, the majority of skeletonization converted dead ends to demands at a single node where the real pipe branches away from the system. Skeletonization was not performed on pipes larger than 8 inches in diameter. The modeling software's terrain extraction (TREX) program was used to apply elevations to the model nodes. The TREX program has the ability to apply elevations to hydraulic model nodes using a representation of a three-dimensional surface. The representation, usually contours, can be constructed using United States Geological Survey (USGS) data. The contours are superimposed on the model layout and the distance to the nearest two contours is used to interpolate the elevation of every node in the model. The final node elevations in the model are indicative of the surface elevation. The accuracy of the data and the final product is within 5 feet, which gives calculated pressures accurate to approximately 2 pounds per square inch (psi). Pipe Characteristics The hydraulic modeling software uses default modeling properties for common pipe materials. The City's irrigation system was modeled using the Hazen-Williams theory of 13-1444.407 Page 3-2 Irrigation System Master Plan December 2013 Criteria, Analysis, and Findings City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 3 - Analysis and Findings.docx pressurized flow. For PVC pipe, an initial C value of 150 was used. An initial value of 140 was used for steel pipe and 120 for ductile iron pipe. Water Demand Distribution The demands presented in Section 2 were distributed throughout the model using a nearest node method. The nearest node method assigns known demands with a known spatial distribution to the nearest node in the system. ArcGIS, a GIS software program, was used to identify irrigated parcels. The area and the geographic center of each parcel was calculated by the GIS program. This information was used to assign the geographic area of each parcel, in acres, to the nearest node in the model. To convert each node's area assignment to a water demand, the demands from Section 2 were used. The total irrigated area in 2012 was approximately 1,492 acres. The PHD from 2012 was approximately 17,529 gpm. The known point demands were subtracted from this total and assigned to the appropriate location in the model. Based on information received from prior water demand studies performed by the City, it was determined that the remaining total irrigation system demand could be distributed evenly across the irrigated area. This method gives an average demand of 11.75 gpm/acre which was then applied universally to all of the nodes in the hydraulic model. The modeled demand is within 1 percent of the demand measured by the City's SCADA system. Wells Wells were modeled using flow control valves attached to virtual reservoirs with a HGL higher than the rest of the City's system. The flow control valves were set to reflect the documented production rates of each well. Model Calibration Model calibration was completed using data collected by the City's SCADA system. The system collects and logs information from the system every 30 to 60 minutes. Monitoring points on the system include well discharges, booster pump station discharges, and the storage tank. Pressure and flow data were known at each pump discharge point within the system during the peak hour. The tank level was not known, so it was estimated using data from nearby points within the system. Flows from each of the wells were modeled using flow control valves. The initial simulation of the model produced hydraulic grade calculations at each well. These calculated hydraulic grades were then compared to the known hydraulic grades collected by the SCADA system and served as the primary calibration criteria. After several iterations, pipe roughness coefficients were universally lowered to a value of 130. All of the hydraulic grades were then within 4 percent of the target grades. Well calibrated models typically have discrepancies of 10 percent or less. Table 3-1 shows the results of the calibration. 13-1444.407 Page 3-3 Irrigation System Master Plan December 2013 Criteria, Analysis, and Findings City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 3 - Analysis and Findings.docx Table 3-1 Hydraulic Modeling Calibration Summary Well Flow Target (gpm) Flow from Model (gpm) HGL Target HGL from Model Discrepancy (%) Island Estates 590 590 610.5 612.47 0.3 Linda Loviisa 443 443 628.6 611.92 – 2.7 I-182 1238 1,238 651.6 638.94 – 1.9 First Place 1663 1,663 649.9 642.72 – 1.1 Sirroco 1415 1,415 640.0 653.29 2.1 Desert Estates 491 491 634.4 617.16 – 2.7 Desert Sunset 1418 1,418 628.2 618.46 – 1.6 Northwest Commons 0 0 629.1 627.01 – 0.3 Road 52 2125 2,125 644.4 634.34 – 1.6 Powerline 1758 1,758 657.8 637.53 – 3.1 Village Pasco Heights 936 936 622.6 614.52 – 1.3 Analysis Criteria Once the physical layout and calibration of the model were completed, the model could be used to analyze flow velocities and pressures within the system. The analysis criteria used to evaluate the hydraulic performance of the irrigation system include minimum system pressures and maximum flow velocities. Any result not meeting these criteria is subject to further investigation and potential corrective action. Flow Velocities For this analysis, pipes whose flow velocities exceed 5 feet per second (fps) under average day demand conditions are considered to have inadequate capacity. Pipe flow velocities are allowed to increase up to 8 fps during PHD conditions. Any pipes with flow velocities above 8 fps under PHD conditions are considered to have inadequate capacity. These velocity limits reflect standard industry practices for acceptable flow velocities in pressurized piping systems. They are chosen to limit excessive head loss in the system. Irrigation System Pressures The City's pressure criteria at service connections are summarized below. These pressure criteria are based on industry standards, Uniform Plumbing Code requirements, and a review of landscape irrigation equipment water pressure requirements. 1. Each service connection should maintain a minimum water pressure of 30 psi during all demand conditions. 13-1444.407 Page 3-4 Irrigation System Master Plan December 2013 Criteria, Analysis, and Findings City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 3 - Analysis and Findings.docx 2. No service connection should exceed a water pressure of 120 psi. Individual customers are responsible for reducing water pressures over 80 psi if they desire to do so. 3. During a failure of any part of the system, the maximum water pressure at customer meters will not exceed 150 psi. System Storage This analysis uses standby storage recommendations provided by the Washington State Department of Health (DOH) for drinking water systems as water storage criteria because the City does not have established water storage criteria for its irrigation system. The DOH typically recommends that drinking water systems provide 150 minutes of water storage during peak demand conditions and that this storage be available to all customers at a minimum pressure of 30 psi. The City does not use the irrigation system to provide fire suppression, so no fire suppression storage is provided. Model and Analysis Findings The calibrated model was used to simulate two scenarios: 2012 conditions and an anticipated future demand condition. Modeling included the City's existing dry systems, but did not include any new pipes or new developments. The results of each analysis are described below. Existing Conditions Existing conditions were modeled using 2012 PHD conditions. These conditions are the same as those used for the calibration of the hydraulic model. Two pipes in the system exceed the flow velocity criteria of 8 fps under PHD conditions. These pipes are 4 inches in diameter and located adjacent to the Sirocco Well discharge. All analysis criteria were satisfied with regard to system pressures. The results are summarized below:  The system does not experience pressures over 120 psi under any demand condition. In order to verify that maximum allowable pressures were not exceeded, a low- demand condition was used to approximate static conditions.  The system experiences pressures over 80 psi near discharges for wells and the Road 108 Booster Pump Station during high production. None of the locations which experience pressures between 80 and 120 psi serve customers. They are typically located on dedicated transmission mains and are caused by topography.  Low system pressures were not predicted by the model under this scenario during normal tank levels. If the storage tank water surface elevation reaches 600 feet AMSL, the system begins to experience isolated low pressures.  No part of the system experiences pressures over 150 psi during a failure of pressure- reducing valves. It is possible that pumps could fail in such a manner as to cause high system pressures downstream of their discharges. 13-1444.407 Page 3-5 Irrigation System Master Plan December 2013 Criteria, Analysis, and Findings City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 3 - Analysis and Findings.docx A graphical summary of modeling results for the existing conditions scenario is shown in Figure 3-1. Future Conditions The calibrated model was used to predict the hydraulic performance of the City's irrigation system under anticipated future conditions. The future condition assumptions are:  All of the City's current dry systems are connected and in use  All of the City's existing subdivisions are fully developed  All of the City's sources are producing the maximum allowed flows simultaneously These assumptions represent near-term conditions that could occur within the next two to five years. The actual timing of these conditions is dependent on a number of variables. Any changes in the following conditions would alter the analysis results:  Expansion of the irrigation system service area beyond assumed service limits  Additional sources of supply  Changes in water rights High system pressures were found near the discharges of wells and pump stations as in the 2012 PHD scenario. No pipes that serve customers directly experienced high pressures. No low system pressures were found by the model. High flow velocities were found by the model at two locations:  Near the discharge of the Sirocco Well as observed in the 2012 PHD scenario  North of the intersection of Road 52 and Sandifur Parkway A graphical summary of modeling results for the future conditions scenario is shown in Figure 3-2. Storage The system storage was evaluated at projected peak hour demand conditions to determine whether or not enough storage is available in the system. The City currently operates the tank at a water level of 126.5 feet which corresponds to an elevation of 639 feet. At this level, the tank provides a total storage of 2.28 MG. The overflow of the tank is at elevation 660 feet. Water stored below elevation 597.5 feet is considered dead storage according to the storage criteria described above. The volume of dead storage in the tank is approximately 1.51 MG and the volume of active storage in the tank, as currently operated, is approximately 0.77 MG. The maximum possible average day demand was calculated by dividing the sum of the City's annual irrigation water rights by the days in service. 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i n (D i a m e t e r I n d i c a t e d i n I n c h e s ) Co u n t y L i n e Fr a n k l i n C o u n t y I r r i g a t i o n D i s t r i c t ( F C I D ) Ir r i g a t i o n S e r v i c e A r e a Pa s c o C i t y L i m i t s Ur b a n G r o w t h A r e a B o u n d a r y Pr e s s u r e B e t w e e n 8 0 P S I a n d 1 2 0 P S I Fl o w V e l o c i t y G r e a t e r T h a n 8 F T / S SO U R C E : Ba s e M a p p i n g - F r a n k l i n C o u n t y G I S ( J u n e 2 0 1 3 ) a n d Be n t o n C o u n t y G I S ( J u n e 2 0 1 3 ) . Ir r i g a t i o n S y s t e m M a p p i n g - C i t y o f P a s c o ( A p r i l 2 0 1 3 ) . FRA N K L I N CO UN T Y B E NT O N CO UN T Y 16 " CI T Y O F P A S C O £¤12 £¤12§¨¦182 ´ 1, 0 0 0 0 1 , 0 0 0 SC A L E I N F E E T Col u mbi a R ive r Figure 3-1 13-1444.407December 2013 RO A D 6 8 IR R I G A T I O N T A N K CA P : 2 . 2 8 M G OE : 6 3 9 F T IS L A N D E S T A T E S WE L L RO A D 1 0 8 B P S CA P : 3 , 0 0 0 G P M HA R R I S R O A D B P S CA P : 3 , 1 2 5 G P M RI V E R I N T A K E ST A T I O N CA P : 3 , 0 0 0 G P M LINDA LOVIISA WELL I-182 WELLFIRST PLACE WELLDESERTESTATESWELLNORTHWESTCOMMONSWELLROAD 52 WELLPOWERLINEWELL DESERT SUNSET WELL VILLAGE AT PASCO HEIGHTS WELL PRV PR V PR V SIRROCO WELL PRVPRVPRVPRVPRV WE S T P A S C O HYDRAULIC MODELING RESULTS FOR EXISTING CONDITIONSCity of Pasco Irrigation System Master Plan HIGH FLOW VELOCITY NEAR SIRROCO WELL ÍÎ$³ ÍÎ$³ ÍÎ$³ÍÎ$³ÍÎ$³ÍÎ$³ÍÎ$³ÍÎ$³!Ø!Ø!Ø!Ø!Ø!Ø!Ø !Ø!Ø!Ø !Ø 3Ú 3Ú3Ú UT 2 4 ' ' 18'' 12'' 2''4 ''3'' 8' ' 6' ' 16 ' ' 1 0'' 8'' 4''4'' 8' ' 1 6'' 10'' 12 ' ' 8'' 4' ' 8'' 4' ' 4''4''8''4''6''4''4''12''4 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88 IRI S L N KOHLER RD ROAD 36 N W R IG L E Y D R PIMLICO DR ROAD 48 W WERNETT RD POW E RL I N E R D ROAD 64 ROAD 76 ROAD 72 ROAD 90 SAHARA DR HILLTOP DR EASY ST ROAD 42 N ST TH OMA S DR ROAD 80 ROAD 44YUMA DRDESERT PLATEAU DR BYERS RD RIC H A RD S ON R D ARGENT PL WESTMINSTER LN ROAD 57ROBERTA RDLENTZ RD E ST ROAD 108 W ILLO W W A Y QU A D R A D R SIROCCO DR KA U T R A IL R D MIDLAND LN RI C HVI E W DR B ST WERNETT RD OVERTON RD R O A D 1 0 5 MI A L N R O A D 1 0 3 HORIZON DR MA PLE DR ATLANTA LN VINCENZO DR MEADOW VIEW DR R O A D 1 0 4 MELODY LN O A K L N ELIZABETH RD DRADIE ST ROAD 92 RIVERHILL DR C O L U M B I A R IV E R R D DESERT PL TAYLOR FLATS R D SEDONA DR DES E R E T DR HAYDEN LN QUAIL RD HOMERUN RD W RICHARDSON RD RI C K Y RD ROAD 97 T U S A Y A N D R W BELL ST MOJAVE DR CLEMENTE LN W DRADIE ST SUNSET TRL BEDFORD ST VIE W L N R O A D 1 0 1 BALFLOUR DR FR ANK LIN R D CHARDONNAY DR MEADOW BEAUTY DR RODE O DR STAR L N ROAD 56 SANDY RIDGE RD R O A D 1 0 6 ROAD 40 OUTLET DR LIV ING STON R D W MELVILLE RDADOBE DRROAD 44 N PRAIRIE LN CONVENTION PL SYRAH DR JA Y L E E N W A Y ROAD 61 L O C U ST L N SC H U M AN L N ROAD 54 W I N T H R O P DR ROAD 62 MA J E S T I A LN PHEASANT LN S HORELINE CT QUAI L R UN R D CORONADO DR VALLEY VIEW PL D E SERT DR MERL OT DR SONORA DR ROAD 70 N ROAD 56 N HILL CREST DR CANDLESTICK DR ROAD 76 N ROAD 58 N W LIVINGSTON RD R O A D 109SHADY L N R O A D 110 ROAD 94 ROAD 70 JOSHUA DR POO LER RD R O A D 1 0 7 MEADOWSWEET STCURLEW LN GO O S E H O L L O W R D STERLI N G R D CHELAN CT ROAD 48 N TUSCANY D R 65TH PL COL BY CT SC EN I C V I E W DR KILLDEER LNBOSCH CT RI C K Y C T SANTA ANNA LOOP STURGIS RD DESERT ST QUAIL BLUFF LN ROAD 67 W A T E R S EDGE DR DOUGVILLE RD CHRIS TIN A C T ACACIA CTMESQUITE DR HARTFORD DR RIV E RWA RD CT EAGLE REACH CT MELVIL L E R D FAMVILLE CT PI N E C T MEL O D Y L N W DUNBARTON AVE SE D O N A C T MOJAVE CT R I E S LI NG CT CACTUS CT J U D E M E I N C T PHE A S A N T C T LINDEMEIN CT K A T H E M E I N C T PELICAN CT ANZA BORREGO CTTUSAYAN CT RIC HARDSON R D WERNETT RDDRADIE ST DRADIE S T ROAD 60ROAD 44 N RICHARDSON RD ROAD 36 MA PLE DR ROAD 44 FR ANK LIN R D ROAD 44 N FRANKLIN RD ROAD 92 DRA DI E S T RICHARDSON RD M A P L E DR ROAD 68 W WERNETT RDLIVINGSTON RD RICHARDSON RD FRANKLIN RD ROAD 56 S U N S E T TR L SUNSET T RL ROAD 44 LIVIN GSTON RD W MELVILLE RDW RICHARDSON RD G:\PDX_Projects\13\1444\CAD\GIS\FIGURES\13-1444-407-WA-FIGURE 3-2.mxd 12/3/2013 8:52:05 AM DKH §¨¦18 2 LE G E N D UT Ex i s t i n g S t o r a g e T a n k 3Ú Ex i s t i n g B o o s t e r P u m p S t a t i o n ( B P S ) !Ø Ex i s t i n g I r r i g a t i o n W e l l ÍÎ$³ Ex i s t i n g P r e s s u r e R e d u c i n g V a l v e ( P R V ) Ex i s t i n g I r r i g a t i o n M a i n (D i a m e t e r I n d i c a t e d i n I n c h e s ) Co u n t y L i n e Fr a n k l i n C o u n t y I r r i g a t i o n D i s t r i c t ( F C I D ) Ir r i g a t i o n S e r v i c e A r e a Pa s c o C i t y L i m i t s Ur b a n G r o w t h A r e a B o u n d a r y Pr e s s u r e B e t w e e n 8 0 P S I a n d 1 2 0 P S I Fl o w V e l o c i t y G r e a t e r T h a n 8 F T / S SO U R C E : Ba s e M a p p i n g - F r a n k l i n C o u n t y G I S ( J u n e 2 0 1 3 ) a n d Be n t o n C o u n t y G I S ( J u n e 2 0 1 3 ) . Ir r i g a t i o n S y s t e m M a p p i n g - C i t y o f P a s c o ( A p r i l 2 0 1 3 ) . FRA N K L I N CO UN T Y B E NT O N CO UN T Y 16 " CI T Y O F P A S C O £¤12 £¤12§¨¦182 ´ 1, 0 0 0 0 1 , 0 0 0 SC A L E I N F E E T Col u mbi a R ive r Figure 3-2 13-1444.407December 2013 RO A D 6 8 IR R I G A T I O N T A N K CA P : 2 . 2 8 M G OE : 6 3 9 F T IS L A N D E S T A T E S WE L L RO A D 1 0 8 B P S CA P : 3 , 0 0 0 G P M HA R R I S R O A D B P S CA P : 3 , 1 2 5 G P M RI V E R I N T A K E ST A T I O N CA P : 3 , 0 0 0 G P M LINDA LOVIISA WELL I-182 WELLFIRST PLACE WELLDESERTESTATESWELLNORTHWESTCOMMONSWELLROAD 52 WELLPOWERLINEWELL DESERT SUNSET WELL VILLAGE AT PASCO HEIGHTS WELL PRV PR V PR V SIRROCO WELL PRVPRVPRVPRVPRV WE S T P A S C O HYDRAULIC MODELING RESULTS FOR FUTURE CONDITIONSCity of Pasco Irrigation System Master Plan HIGH FLOW VELOCITY NEAR SIRROCO WELL 13-1444.407 Page 3-8 Irrigation System Master Plan December 2013 Criteria, Analysis, and Findings City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 3 - Analysis and Findings.docx calculate a projected peak hour demand of 22,419 gpm. A peak hour demand peaking factor of 2.895 was used. This demand would be met by a combination of the City's wells and storage. It was assumed that all of the City's sources would be pumping at the current instantaneous water right of 17,164 gpm. The tank would need to provide approximately 5,255 gpm for 150 minutes at a minimum pressure of 30 psi. Based on this analysis, the system requires approximately 788,250 gallons of storage for the projected peak demand, not including dead storage. Based on this analysis, the existing irrigation system reservoir has adequate capacity to meet these storage needs. Operations and Maintenance Problems The City experiences some operations and maintenance problems with the irrigation system which are described below. Northwest Commons Well Use The Northwest Commons well is plumbed so that it supplies the City's irrigation system and a nearby agricultural pivot simultaneously. Whenever the well is being operated, the pivot must also operate. Any water produced in excess of the pivot's requirements flows to the irrigation system. The City currently allows a private third party to use the well to operate the pivot, limiting the City's ability to use the well. The agreement under which this well is operated is attached as Appendix C. Freshwater Mussels Some parts of the irrigation system which convey water drawn from the Columbia River experience annual buildup of freshwater mussels in the piping. The most problematic area of the mussel infestation is in the piping between the Road 108 Booster Pump Station and the crossing under Interstate I-182. During the summer, high flows dislodge some mussels from the pipe walls which can cause operational problems such as plugging. Access to Pipes in Island Estates and Sunny Meadows The original irrigation system piping that was constructed by private developer Water, Inc. is located in the Island Estates and Sunny Meadows subdivisions. These pipes were installed in easements located in the less accessible alignments on private property. City operations staff may have difficulty accessing these areas for routine or emergency maintenance. Interstate Highway 182 Crossing Irrigation water supplied by pumps from the river intake station and the Road 108 Booster Pump Station is conveyed underneath Interstate Highway 182 to serve the majority of the City's irrigation system. The crossing ties into a pipe near Quadra Drive adjacent to the 13-1444.407 Page 3-9 Irrigation System Master Plan December 2013 Criteria, Analysis, and Findings City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 3 - Analysis and Findings.docx interstate highway. Discussions with City staff indicate that a complete shutdown of the highway crossing is usually necessary to perform system maintenance and repairs in this area because of inadequate local isolation valving. Telemetry System and Communications According to discussions with City staff, the Powerline Well, Road 52 Well, and the Northwest Commons Well all rely on the same radio for communication with the system. If this single radio were to fail or be compromised, communication and control at all three sites would fail. City staff have indicated that the radio has experienced some irregular communication problems in the past. Data collected by the City's supervisory control and data acquisition (SCADA) system indicate that there is a problem with the remote level sensor in the Road 68 Irrigation Tank. Data received for the last several years does not include accurate or consistent readings on the tank water level. Well Condition Assessment A tabletop condition assessment of the City's groundwater supply wells was completed as part of this plan. The assessment consisted of gathering and analyzing available information. The objective of this analysis is to identify wells having apparent construction, performance, or water quality issues that may be limiting production with the purpose of developing a targeted approach at candidate wells to regain performance and optimize individual and combined system production. The results of this assessment are discussed below. Data Review and Gap Analysis The following information was provided by the City and was used in assessing the irrigation supply system:  Water Rights  Driller’s well logs  Well construction records  Aquifer test results  Specific capacity  Well inspection reports  Well video surveys  Water quality data  Well usage information  General notes and observations gathered by City operations staff 13-1444.407 Page 3-10 Irrigation System Master Plan December 2013 Criteria, Analysis, and Findings City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 3 - Analysis and Findings.docx All of the wells have some information available, but there are some data gaps that result in recommendations for further assessment. A tabular summary identifying the data available and the data gaps is presented in Table 3-2. Observations and Analysis The results of the well condition assessments are summarized as follows:  Review of available information for the Desert Sunset, Sirocco, NW Commons, Island Estates, I-182, and Powerline Road wells indicated the presence of biofouling and incrustation which are possibly plugging screens and perforations. Significant accumulations of sediment or debris in the wells are also noted.  Observations indicated minor mineral and biological deposits within the First Place and Desert Estates wells.  Based on the information provided and relatively newer construction, the apparent conditions of the Road 52 and Linda Loviisa Wells are considered good. Table 3-3 ranks the wells in terms of priority, potential for improvement, and overall condition assessment. The Desert Sunset Well received the highest priority ranking which means that it should be the first well to receive maintenance and rehabilitation. The Sirocco well has the highest potential for improvement which means that its capacity could be improved the most. The Desert Sunset Well received the highest condition assessment ranking indicating that it is in the worst overall condition. The overall assessment found that there are opportunities for well performance and yield improvements. The three highest- ranking wells in need of improvements are the Desert Sunset Well, the Sirocco Well, and the Northwest Commons Well. Table 3-4 presents a summary of the well condition assessments. Summary This section presented an analysis of the City's irrigation system. The distribution system was analyzed using a hydraulic model. Current conditions and an anticipated future condition were modeled. Low pressures and high velocities, as defined by the analysis criteria, were noted. The irrigation system storage was analyzed for deficiencies. The condition of the City's groundwater supply wells was also assessed. The results of these analyses will be used in Section 4 to develop recommendations for improvements to the irrigation system. 13-1444.407 Page 3-11 Irrigation System Master Plan December 2013 Criteria, Analysis, and Findings City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 3 - Analysis and Findings.docx Table 3-2 Irrigation Well Data Summary and Gap Analysis1 Well Water Rights Location Map Driller's Well Log Well Construction Aquifer Test Data and Analysis Specific Capacity Measurements Well Inspection or Rehabilitation Report Well Video Survey Water Quality Data Well Usage Information Notes and Observations Comments and Data Gaps Desert Estates 4 4 4 4 4 4 4 1 0 2 4 ▪ 407 gpm/ft SC2 (source: 4-hr pump test by Layne) ▪ Construction apparent from video log does not match driller's log or City's specification sheet ▪ Extensive biofouling observed during well video survey precluded adequate assessment of existing conditions First Place 2 4 4 4 2 2 4 4 0 2 4 ▪ 3,591 gpm/ft SC (source: 2-hr step-rate test conducted by Layne; 3 steps, with first two only lasting approx. 10 min each step) ▪ 1,426 gpm/ft SC (source: MSA) Village at Pasco Heights 2 4 4 4 2 2 4 4 0 2 4 ▪ 856 gpm/ft SC (source: 4.5-hour pump test conducted at variable rate by Green Valley Pump Services; quality of test data is considered poor) Desert Sunset 4 4 3 3 0 2 4 4 1 2 4 ▪ 829 gpm/ft SC (source: MSA) ▪ Well log mentions pump test completed, but test data not discovered ▪ 24 mg/L Nitrate-N sampled on 7/6/2005 Island Estates 2 4 4 4 0 0 4 4 1 2 4 ▪ No available aquifer testing data ▪ Construction noted on driller's log not consistent with video log ▪ 22 mg/L Nitrate-N sampled on 7/6/2005 I-182 2 4 4 4 0 1 2 4 1 2 3 ▪ 11,333 gpm/ft SC (source: MSA); lacks detailed well data ▪ 28 mg/L Nitrate-N sampled on 7/6/2005 Road 52 2 4 4 4 0 2 2 1 0 2 3 ▪ 1,333 gpm/ft SC (source: 4-hr well test by Layne); 2,200 gpm/ft SC (source: MSA) ▪ Well inspection reports do not match construction noted on driller's log ▪ Well inspection reports titled "5766 NW Commons well" however, do appear to match Road 52 well construction ▪ No video log provided for review; existing condition was defined to the extent possible using observations made during well inspections Powerline Road 2 4 4 4 0 0 0 4 0 2 4 ▪ Little data available Sirocco 2 4 4 4 0 0 0 4 1 2 2 ▪ Perforated casing span observed during video survey does not match well construction noted driller's well log; ▪ 28 mg/L Nitrate-N sampled on 7/6/2005 Northwest Commons 2 4 1 1 0 2 4 2 0 2 4 ▪ 111 gpm/ft SC (source: MSA) ▪ Rehabilitated December 2007 (sonic blasting, bailing to remove sediment) ▪ Well inspection reports and video survey observations do not match construction noted on driller's well log ▪ Well construction information taken from well inspection and rehabilitation reports Linda Loviisa 2 4 4 3 0 0 0 0 0 1 0 ▪ New well constructed December 2012 Notes 1. A rank of 4 indicates best quality data and a rank of 0 indicates no data available 2. Specific capacity 13-1444.407 Page 3-12 Irrigation System Master Plan December 2013 Criteria, Analysis, and Findings City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 3 - Analysis and Findings.docx Table 3-3 Irrigation Well Ranking Summary Well Improvement Priority Rank Improvement Potential Rank Condition Assessment Rank Desert Sunset 1 4 1 Sirocco 2 1 4 Northwest Commons 3 3 3 Island Estates 4 2 5 I-182 5 7 6 Powerline Road 6 7 7 First Place 7 6 10 Desert Estates 8 6 8 Village at Pasco Heights 9 5 2 Road 52 9 7 9 Linda Loviisa 9 6 11 Table 3-4 Well Condition Assessment Summary Well Observations and Findings Desert Sunset ▪ Well is 39 years old and is approaching the typical life expectancy for groundwater supply infrastructure (commonly assumed to be between 30 and 50 years in normal groundwater environments). ▪ Flow to well is through perforated casing rather than a more efficient, engineered well screen. ▪ Static and pumping water levels are within perforated interval. ▪ Approximately 45 ft of accumulated sediment/debris possible (video depth < reported depth) ▪ Bottom depth of open-interval span not known. ▪ Accumulated sediment/debris in well approaching intake depth setting. ▪ Heavy biofouling; precluded adequate assessment of existing conditions from video survey. ▪ Moderate incrustation of perforations previously reported. Sirocco ▪ Well is 37 years old and is approaching the typical life expectancy for groundwater supply infrastructure (commonly assumed to be between 30 and 50 years in normal groundwater environments). ▪ Flow to well is through perforated casing rather than a more efficient, engineered well screen. ▪ Major biofouling present, mostly encompassing and possibly plugging perforations. ▪ 17 ft of sediment/debris buildup in bottom of well? (video depth < reported depth) Northwest Commons ▪ Well age is unknown. ▪ Previously rehabilitated (Dec-07). ▪ Flow to well is through perforated casing rather than a more efficient, engineered well screen. ▪ Major biofouling present, mostly encompassing and possibly plugging perforations. ▪ Approximately 3 ft of accumulated sediment/debris in bottom of well. ▪ Accumulated sediment/debris near intake. 13-1444.407 Page 3-13 Irrigation System Master Plan December 2013 Criteria, Analysis, and Findings City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 3 - Analysis and Findings.docx Table 3-4 Well Condition Assessment Summary (continued) Well Observations and Findings Island Estates ▪ Well is 38 years old and is approaching the typical life expectancy for groundwater supply infrastructure (commonly assumed to be between 30 and 50 years in normal groundwater environments). ▪ Approximately 9 feet of sediment/debris buildup blocking three feet of perforated interval? (video depth < reported depth) ▪ Flow to well is through perforated casing rather than a more efficient, engineered well screen. ▪ Major biofouling present, mostly encompassing and possibly plugging perforations. I-182 ▪ Well is 34 years old. ▪ Approximately 2 feet of sediment/debris accumulation in well? (video depth < reported depth) ▪ Some biofouling and incrustation of well screen present, blocking roughly 25% o f open area. Powerline Road ▪ Well is 33 years old. ▪ Varying degree of biofouling present (minor to major). First Place ▪ Well is 6 years old. ▪ Minor biofouling present at top and bottom of well screen. Desert Estates ▪ Well is 31 years old. ▪ Minor scale/mineral deposits on well screen. ▪ Some minor corrosion observed near bottom of screen. Village at Pasco Heights ▪ Well is 38 years old and is approaching the typical life expectancy for groundwater supply infrastructure (commonly assumed to be between 30 and 50 years in normal groundwater environments). ▪ Approximately 1 ft of sediment/debris accumulation in well/screen bottom? ▪ Heavy incrustation/mineral deposits; approximately 50 to 80% of screen open area estimated to be blocked . ▪ The well is equipped with a sand filter. ▪ Casing noted to have been pulled back to 159 ft bgs during screen exposure, roughly 3 ft above top of screen assembly. ▪ Gap from casing pullback could be allowing formation material to enter well. ▪ Small gap noted during review of video survey, though may be from separated casing joint/weld ▪ Blasting cap debris previously observed in well; possibly from previous rehabilitation. May have caused the separation noted above. Road 52 ▪ Well is 7 years old. ▪ Inspection report notes damage to top of well screen; no video log available for review to confirm or assess. ▪ Besides noted damage, the well screen (based on inspection report photos) appears in relatively good condition. ▪ Inspection report notes stainless steel banding material in well. Linda Loviisa ▪ New well constructed December 2012 ▪ No inspection reports or well video survey available for review SECTION 4 13-1444.407 Page 4-1 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx SECTION 4 RECOMMENDATIONS Introduction Section 4 presents recommendations based on the analysis and findings of Section 3. Recommendations for improvements to wells, improvements to the irrigation system, and opportunities for further planning and study are provided. Improvements Completed Since 2005 The City of Pasco has completed irrigation system improvements that were recommended as part of its 2005 I-182 Corridor Irrigation System Plan (2005 Plan). Table 4-1 shows a summary of the improvements recommended in the 2005 Plan that have since been completed. Table 4-1 Irrigation System Improvements Completed Since 2005 Improvement Number from 2005 Plan Project Description IW-1 Construction of the First Place Well IW-2 Existing Well Rehabilitation IW-3 Existing Well Rehabilitation IW-4 Future Well Rehabilitation IW-5 Future Well Rehabilitation IW-6 Future Well Rehabilitation IS-1 Conversion of Road 68 Standpipe from domestic system to irrigation system IB-1 Construction of the Harris Road Booster Pump Station (currently under construction) IR 1.1 16-inch diameter irrigation main from Court Street to Harris Road Booster Pump Station (currently under construction) IR 1.2 16-inch diameter main along Harris Road from Harris Road Booster Pump Station to Broadmoor Boulevard (currently under construction) IR 1.3 16-inch diameter main from Broadmoor Boulevard to Sandifur Parkway IR 1.5 Construction of 10-inch diameter PVC main from I-182 Well to system IR 1.7 16-inch diameter irrigation main along Road 52 from Leopard Drive (Powerline Road) to Sandifur Parkway In addition to these improvements as described by the 2005 Plan, the City has completed the construction of two additional new irrigation wells. Construction of improvement IR 1.4 is 13-1444.407 Page 4-2 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx no longer necessary because the City constructed an irrigation main along Sandifur Parkway to the tie-in point proposed by improvement IR 1.4. The main along Sandifur Parkway accomplishes the same hydraulic task as the main which had been proposed by IR 1.4. The City is currently completing design for a project proposing construction of a new river intake near the City's existing river intake station. The new intake would be used exclusively for drinking water and the old intake would be converted to irrigation use. Distribution System Improvements Recommended improvements to the distribution system include irrigation main extensions, replacement of undersized mains, looping improvements, isolation valve installation, and other minor improvements. Each is discussed below. Irrigation Main Improvements Irrigation main improvements include replacing undersized pipes to reduce head loss, extending existing mains, and looping mains to improve connectivity and reliability of the system. Recommended irrigation main projects are:  Extend arterial main on Powerline Road west to Road 90  Extend arterial main on Powerline Road east to Road 52  Extend arterial main on Sandifur Parkway east and south along Road 44 to tie in at Burden Boulevard  Extend distribution mains on Sahara Drive west to Road 44  Replace small-diameter pipes on Sirocco Drive near Sirocco Well discharge with larger pipes  Extend existing main on Wrigley Drive from North Road 68 to Convention Drive. Completing this improvement requires right of way or easement acquisitions. Approximately 22,000 linear feet of new irrigation main are recommended for construction. The total estimated project cost for these improvement is approximately $2.77 million. An itemized tabulation of irrigation main projects and their associated costs is included later in this section. Interstate Highway 182 Crossing Isolation Valve Improvements It is possible to make complete shutdown of the Interstate Highway 182 crossing less frequent by installing isolation valves in the system nearby. This would allow operations staff to shut off portions of the line along Quadra Drive instead of the main crossing in order to make repairs. Repairs on the main crossing would still require the crossing to be shut down. 13-1444.407 Page 4-3 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx Based on a review of available information, it is recommended that the City install two 12- inch diameter isolation valves near the highway crossing. For budgeting purposes, a project cost of $5,000 per valve has been allowed for a total project cost of $10,000. It is recommended that the installation of the valves be done between October 31 and April 1 when the irrigation system is not in use. Island Estates and Sunny Meadows Distribution Isolation Valve Improvements The Island Estates and Sunny Meadows subdivisions have irrigation systems that were installed in easements that run through the rear of residential lots. When one of these older mains breaks, City operations staff have difficulty getting access to residents' back yards to make repairs. Where possible, it is recommended that isolation valves be installed so that mains can be turned off from public right-of-way while repairs are made. It is recommended that the installation of the valves be done between October 31 and April 1 when the irrigation system is not in use. It is recommended that an estimated preliminary budget of $156,000 be provided to complete these improvements. This estimated budget is based on the installation of up to 52 valves at $3,000 per installation. The number of proposed isolation valves recommended is based on a review of the City's GIS data. It is further recommended that City staff identify final locations of the isolation valve improvements and confirm the final budget for this work. Northwest Commons Well and Pivot The Northwest Commons Well is currently plumbed to serve the nearby irrigation pivot and the City's irrigation system. It is recommended that the City install piping and valves near the well that allow the irrigation pivot to be supplied from the system instead of just the well. This new connection should be metered. The direct connection from the well to the pivot should be abandoned. This will allow the City to use the Northwest Commons well on its own schedule and allow the pivot owner to operate the pivot without operating the well. The estimated project cost for this recommendation is approximately $68,000. Telemetry Improvements Based on discussions with City staff, it is recommended that the City upgrade communication capacity along Powerline Road with the installation of a fiber optic line. The fiber optic line would serve as a more reliable means of communication from the central telemetry unit to the Powerline Well, Road 52 Well, and Northwest Commons Well. Having two ways to communicate to the wells makes the system more reliable as well. The estimated project cost for this recommendation is approximately $35,000. Source and Storage Improvements Recommendations for storage and irrigation well improvements are discussed below. 13-1444.407 Page 4-4 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx Storage The storage analysis presented in Section 3 found that the existing irrigation system reservoir has adequate storage capacity for the future conditions described if the reservoir is operated at a higher water level. It is also recommended that existing new water level sensing equipment be repaired or replaced to obtain more accurate water level readings. The estimated project cost for this recommendation is $10,000. Irrigation Well Improvements The results of the analysis presented in Section 3 were used to develop recommendations on irrigation well assessment, rehabilitation, replacement, and monitoring. A discussion of these recommendations is presented below. Well Assessment and Rehabilitation Plan The analysis presented in Section 3 was used to develop a well assessment and rehabilitation plan. The plan prioritizes candidate wells for further assessment and potential rehabilitation for the purposes of optimizing individual well performance and maintaining the value of the City’s irrigation assets. This plan is developed to ensure that this asset remains in service for the long term at minimal operating costs. The main objective for rehabilitating a well is to restore or prevent losses in both production capacity and well efficiency. Conditions routinely found to contribute to declining well performance include incrustation, biofouling, physical plugging of formation or screen or both, and corrosion. These conditions could be caused by inherent characteristics of the aquifer, well design and construction, water quality, well operations, or combinations thereof. Rehabilitation techniques used to address these conditions in attempts to restore or recondition wells include:  Mechanical methods such as brushing, surging, and airlift pumping to loosen and remove incrustation, organic material, and accumulated sediment  Chemical treatments designed to dissolve and weaken encrusting minerals and biological slimes  Impulse generation methods (e.g., Hydropuls®) that generate high-pressure pulses that loosen mineral and biological deposits in the well and adjacent formation. This technology is typically used in combination with other mechanical and/or chemical methods to increase its effectiveness A combination of mechanical, chemical, and impulse generation well rehabilitation methods are recommended for the following wells:  Desert Sunset  Sirocco 13-1444.407 Page 4-5 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx  Northwest Commons  Island Estates  I-182  Powerline Road The recommended order of activities is as follows: 1. Conduct a one-hour specific capacity test to establish baseline conditions pre- rehabilitation and collect a groundwater quality sample for inorganic chemistry and bacterial assessment. 2. Remove pumping equipment and install rehabilitation equipment. 3. Brush and surge well to loosen buildup and airlift pump to remove debris. 4. Tremie dissolved chemical solution into the water column and agitate by surging to penetrate the formation and enhance the effectiveness of the treatment. 5. Apply impulse generation technology. 6. Remove the loosened debris by airlift pumping. 7. Conduct a video survey of the well, disinfect the well, and reinstall pumping equipment. 8. Conduct a one-hour specific capacity test to evaluate the effectiveness of the rehabilitation and assess the post-rehabilitation well performance. A combination of mechanical and chemical methods is recommended for the First Place and Desert Estate Wells to address the minor mineral and biological deposits observed. Activities to be performed would be those identified above, excluding the impulse generation efforts. Based on the information provided and relatively newer construction, the apparent conditions of the Road 52 and Linda Loviisa Wells are considered good and no rehabilitation efforts are recommended at this time. It is recommended that well video surveys be completed at these wells to verify existing conditions and monitoring each well’s yield and drawdown. This work will establish baseline performance conditions and monitor for potential performance declines over time. It is recommended that no rehabilitation work be completed for the Village at Pasco Heights Well due to its age and poor condition. Based on an evaluation of the well rehabilitation is not likely to adequately address the significant incrustation, poor casing condition, and sanding conditions at this well. The recommended rehabilitation activities for each well are summarized in Table 4-2. Well Data Acquisition Section 3 identified gaps in the available information concerning the City's existing irrigation water supply wells. A list of recommendations to fill those data gaps was developed and is presented in this section. Table 4-3 shows a summary of the proposed data acquisition 13-1444.407 Page 4-6 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx activities. It is assumed that the City has the resources necessary to complete the recommended activities, so a project cost was not developed for this work. Table 4-2 Recommended Well Rehabilitation and Performance Testing Activity Summary Well Rehabilitation and Performance Testing Activities Mechanical Chemical Impulse Generation Pre- and Post- Performance Testing Video Survey Desert Sunset X X X X X Sirocco X X X X X NW Commons X X X X X Island Estates X X X X X I-182 X X X X X Powerline Rd. X X X X X First Place X X X X Desert Estates X X X X Road 52 X X Linda Loviisa X X Village at Pasco Heights Table 4-3 Irrigation Well Data Acquisition Recommendations Summary Well Recommended Data Acquisition Activities Northwest Commons Conduct a specific capacity test to confirm yield and reassess whether the yield can be increased at this well. I-182 Establish the pump intake depth setting. This can be done in conjunction with rehabilitation activities. Assess available drawdown and evaluate the ability to increase yield at this well. Island Estates Conduct a specific capacity test. This test can be done in conjunction with rehabilitation activities. Assess whether the yield can be increased at this well. Linda Loviisa A well field study should be performed to determine the optimal sizes and locations of new wells in the Linda Loviisa area. More information is presented below. Village of Pasco Heights Well Replacement It is recommended that a new well be drilled to replace the existing Village of Pasco Heights Well. To confirm the timing and need for this improvement, it is recommended that the well’s yield and drawdown be monitored to assess changes in its performance over time and 13-1444.407 Page 4-7 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx plan for replacement. The estimated project cost for a replacement well is approximately $173,000. A detailed cost summary is provided in Appendix D. Construction of New Irrigation Wells Based on the assessment presented in Section 3, up to six new wells could be necessary. These new irrigation wells would be a mixture of wells meant to replace some of the City's existing irrigation wells and wells improve the City's irrigation system capacity. For budgeting purposes, a project cost of approximately $616,000 per well has been developed. A detailed cost summary is available in Appendix D. The number of new irrigation wells that will be necessary will not be known until a well field study and data acquisition have been completed. The capital improvements program presented in this section assumes that all six wells will be necessary. Well Houses It is recommended that the City continue to improve its wells by enclosing them within well houses. Enclosures minimize potential damage to equipment from exposure and reduce noise levels. Well houses also improve the security of the well and add aesthetic value to the vicinity. The estimated project cost for this improvement is approximately $65,000 per well house. Well Performance Monitoring Program It is recommended that the City implement a monitoring program at all existing wells to track well performance and plan for periodic well maintenance, rehabilitation, and potential replacement. The recommended monitoring plan consists of bi-annual measurements of specific capacity from each well. The specific capacity measurements should be made prior to system start-up in the spring and following system shut-down in the fall. The process is described below:  Measure the static water level from a common measuring point during a period when the well has been idle.  Measure the pumping water level from the same measuring point after 30 and 60 minutes of pumping.  Maintain a constant pumping rate and record the flow rate at 30 and 60 minutes of pumping.  Calculate the specific capacity for each well. The specific capacity is the pumping rate divided by the amount of drawdown. Drawdown is calculated by subtracting the static water level from the pumping water level. The specific capacity measurements for each well should then be monitored over time to evaluate the need for maintenance and rehabilitation. Water levels should also be recorded 13-1444.407 Page 4-8 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx during periods when the well has been idle to assess whether apparent changes in specific capacity are actually related to well performance or groundwater level declines in the aquifer. Dry Systems It is recommended that the City begin using its existing dry systems. According to predictions based on hydraulic modeling, the City's existing irrigation system has the hydraulic capacity to support the new systems. This operational change does not have any associated capital cost as long as no new pipe is required to connect the dry systems to the existing system. Recommendations for Further Study and Planning During the course of this study, opportunities for further study that could improve planning efforts for the City's irrigation system were identified. This section presents those findings. Well Field Study It is recommended that a well field study be completed in order to determine the optimal locations and sizes of new irrigation wells in the Linda Loviisa area. These wells will increase the irrigation system capacity. A budget of $24,000 is recommended for this work. Freshwater Mussels It is recommended that the City conduct further investigation on the nature of the freshwater mussel infestation in the western portion of the system near the Road 108 Pump Station. Depending on the type of mussel, there may be federal or state regulations regarding acceptable ways to clear the pipes. The mussels should be identified and the extent of the infestation determined via television inspection or some other means. In the meantime, it is recommended that the City decrease pressure at the Road 108 Pump Station or limit its use. This may limit or halt the spread of the freshwater mussel colonization. A budget of $25,000 is recommended for this work. Rate Structure Study The City currently charges a flat rate to residential customers. Large customers are billed by irrigated acre. Some of its larger customers are served and billed according to undocumented verbal agreements. Industry experience has shown that the use of water under this rate structure is relatively uncontrolled. It is recommended that the City undertake a rate study and a financial review. The results of this work will assist the City in developing rates that ensure that the current level of service is maintained and that funds are available for capital projects and system growth. A budget of $25,000 is recommended for this work. 13-1444.407 Page 4-9 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx Irrigation System Master Plan Update As the City's irrigation system grows and additional water rights are acquired, the City should re-evaluate its capital improvements plan and check on the performance of the hydraulic system. This plan should be updated every five years or sooner to reflect major system expansions or changes as well as any significant changes in water rights. As part of this study it is recommended that the skeletonized hydraulic model be further developed to include all system piping. A budget of $30,000 is recommended for this work. Project Cost Estimates Project cost estimates were developed for all recommended irrigation system improvements. The project cost estimates include construction cost with a 10 percent contingency, sales tax, and a 35 percent allowance for administration, engineering, and legal services. The cost estimates developed are commensurate with a Class 4 cost estimate as defined by the American Association of Cost Engineers. The actual cost can vary from 30 percent under to 50 percent over the estimated cost. Appendix D includes data and detailed breakdowns of the project costs for the recommended system improvements. Since construction costs change periodically, an indexing method to adjust present estimates in the future is useful. The Engineering News Record (ENR) Construction Cost Index (CCI) is a commonly used index for this purpose. For purposes of future cost estimate updating, the September 2013 ENR CCI for Seattle, Washington is 10147.96. Summary This section presented recommendations for capital improvements to the irrigation system and maintenance programs. These recommendations were based on analysis of the system as presented in Section 3. Tables 4-4 and 4-5 include tabulated summaries of all recommended improvements and their associated estimated project costs. The recommendations are separated into near-term improvements and long-term improvements. Near-term improvements are those which should be completed within the next one to five years. Long- term improvements should be completed in six to twenty years. Figure 4-1 shows the City's irrigation system with recommended improvements highlighted and the dry systems operational. 13-1444.407 Page 4-10 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx Table 4-4 Near-Term Capital Improvement Program Summary Group ID Project Location or Name Project Limits Project Description Estimated Project Cost Di s t r i b u t i o n S y s t e m Im p r o v e m e n t s IR.2 Powerline Road Road 56 to Road 52 Extend existing 16-inch diameter main east to Road 52. The new main may be built in right of way that is being platted as part of the construction of a new elementary school at the intersection. $186,000 IR.4 Sahara Drive West along Sahara Drive from end of existing mains to Road 44 Extend two 4-inch diameter distribution mains on Sahara Drive west to the existing 12-inch diameter main on Road 44. This improvement provides a redundant connection to the rest of the system if the connection at Burden Boulevard is out of service for any reason. $46,000 IR.5 Sirocco Drive Sahara Drive to Saguaro Drive Install approximately 1,200 linear feet of new 6-inch diameter distribution piping near the discharge of the Sirocco Well. The new pipes should be installed in public right of way. The existing pipes should be abandoned to eliminate pipe crossings in the rear of private lots. $90,000 D.2 Isolation Valve Improvements Phase 1 Island Estates and Sunny Meadows Subdivisions Installation of up to 52 isolation valves in public right of way will reduce the need for City staff to access back yards during maintenance and repairs and allow more customers to stay online during emergencies. $156,000 D.3 Isolation Valve Improvements Phase 2 Interstate Highway 182 Crossing Installation of two isolation valves in the vicinity of the crossing may help to prevent complete shutdown of the crossing during maintenance and repair activities. $10,000 D.4 Northwest Commons Pivot Improvements Northwest Commons Subdivision This improvement would tie the Northwest Commons irrigation pivot directly to the irrigation system and meter the pivot at the point of withdrawal. This will allow the City to operate the Northwest Commons Well independently of the pivot. Proposed pipe is 8 inches in diameter. $30,0001 Dr y Sy s t e m s DS Activate Dry Systems - This improvement is an operational improvement that consists of activating the portions of the City's irrigation system which are currently not in use.2 - 13-1444.407 Page 4-11 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx Table 4-4 Near-Term Capital Improvement Program Summary (continued) Group ID Project Location or Name Project Limits Project Description Estimated Project Cost So u r c e a n d St o r a g e Im p r o v e m e n t s S.1 Road 68 Irrigation Tank Improvements - This improvement proposes to change the maximum water level in the Road 68 Irrigation Tank from 639 to 641.5. It is an operational change and requires no capital investment. This project also includes inspection and repair or replace level sensing equipment inside the Road 68 Irrigation Tank. $10,000 S.2 Irrigation Well Rehabilitation Program - Rehabilitation and data acquisition on all wells except Village at Pasco Heights Well.3 $220,000 Pl a n n i n g a n d S t u d i e s P.1 Freshwater Mussel Study - Conduct a study to determine the most effective way to address freshwater mussel colonization of distribution piping exposed to Columbia River Water. $25,000 P.2 Linda Loviisa Well Field Study - Conduct a well field study in order to determine the optimal locations and sizes of new irrigation wells in the Linda Loviisa area. $24,000 P.3 Data Acquisition on Existing Wells - This recommendation consists of gathering data consistent with Table 4-3 above. The City has resources to accomplish this project so there is no project cost. - Total Budget Recommended for all Near-Term Capital Improvements $797,000 Notes 1. For cost estimating purposes, 200 linear feet of 6-inch diameter PVC was assumed and $15,000 was added for installation of a new meter and valves. 2. See Figure 2-1 for the location of the City's existing dry systems. 3. See text for detailed description of rehabilitation activities and wells involved. 13-1444.407 Page 4-12 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx Table 4-5 Long-Term Capital Improvement Program Summary Group ID Project Location or Name Project Limits Project Description Estimated Project Cost Di s t r i b u t i o n S y s t e m I m p r o v e m e n t s IR.1 Powerline Road Road 90 to Convention Drive Extend existing 16-inch diameter main west to Road 90 to improve flow and eliminate dead ends. $1,000,000 IR.3 Sandifur Parkway and Road 44 Porto Lane to Burden Boulevard Extend existing dead-end 8-inch diameter main on Sandifur Parkway near Porto Lane along east side of Road 44 south to Burden Boulevard. Connect all dead-end distribution mains along Road 44 to the new main. $325,000 IR.6 Wrigley Drive Road 68 east to Convention Drive Installation of a 12-inch diameter main between existing distribution mains on Road 68 and Convention Drive. This improvement requires additional right-of-way. $212,500 D.1 600 Zone PRV Supply 600 Zone This improvement proposes installation of a redundant 12-inch diameter source of supply to the 600 Zone. The ultimate size and routing of the pipe and source zone would be chosen by the City at a later time once right of way, easements, or land can be acquired between the two zones. $915,0001 Te l e m e t r y Im p r o v e m e n t s T.1 Road 52 Telemetry Improvements Road 52 This improvement proposes installation of a signal converting station to improve communications from the central telemetry system to the Powerline Road Well, Road 52 Well, and Northwest Commons Well. $35,000 So u r c e Im p r o v e m e n t s S.3 Village at Pasco Heights Well Replacement Village at Pasco Heights Construction of a new well at Village of Pasco Heights. This project assumes that the existing pump and motor will be reused. $173,000 S.4 Well Houses - Construction of well houses to enclose existing wells and associated equipment. It is assumed that a total of seven well houses will be built at a project cost of $65,000 per well house. $455,000 13-1444.407 Page 4-13 Irrigation System Master Plan December 2013 Recommendations City of Pasco K:\TAC_Projects\13\1444 - Pasco Water Resources Study\407 Plan Preparation\Irrigation System Master Plan\Section 4 - Recommendations.docx Table 4-5 Long-Term Capital Improvement Program Summary (continued) Group ID Project Location or Name Project Limits Project Description Estimated Project Cost So u r c e Im p r o v e m e n t s S.5 Construction of New Irrigation Wells - Up to six new irrigation wells could be necessary to improve the irrigation system capacity. For budgeting purposes, a project cost of $616,000 per well has been assumed.2 $3,696,0003 Pl a n n i n g a n d St u d i e s P.4 Rate Study - Conduct a rate study to see if irrigation system rates are adequate. The rate study will be informed by the selection of a capital improvements program. $25,000 P.5 Irrigation System Master Plan Update - Update of this irrigation system master plan following major changes to the irrigation system or after five years, whichever occurs first. $30,000 Total Budget Recommended for all Long-Term Capital Improvements $6,867,000 Notes 1. For cost estimating purposes, 6,500 linear feet of 12-inch diameter PVC was assumed and $100,000 was added for a pressure-reducing station. 2. The location of new wells will depend on data acquisition and the Linda Loviisa well field study. 3. The project cost is $616,000 per new irrigation well. With a total of six wells, the total project cost is $3.70 million. I t is possible that fewer than six new wells will be necessary. 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r e R e d u c i n g V a l v e ( P R V ) Ex i s t i n g I r r i g a t i o n M a i n (D i a m e t e r I n d i c a t e d i n I n c h e s ) Co u n t y L i n e Fr a n k l i n C o u n t y I r r i g a t i o n D i s t r i c t ( F C I D ) Ir r i g a t i o n S e r v i c e A r e a Pa s c o C i t y L i m i t s Ur b a n G r o w t h A r e a B o u n d a r y Pr e s s u r e Z o n e s : Ri v e r I n t a k e Z o n e 54 7 Z o n e 56 0 Z o n e 59 4 Z o n e 60 0 Z o n e 63 9 Z o n e SO U R C E : Ba s e M a p p i n g - F r a n k l i n C o u n t y G I S ( J u n e 2 0 1 3 ) a n d Be n t o n C o u n t y G I S ( J u n e 2 0 1 3 ) . Ir r i g a t i o n S y s t e m M a p p i n g - C i t y o f P a s c o ( A p r i l 2 0 1 3 ) . FRA N K L I N CO UN T Y B E NT O N CO UN T Y 16 " CI T Y O F P A S C O £¤12 £¤12§¨¦182 ´ 1, 0 0 0 0 1 , 0 0 0 SC A L E I N F E E T Col u mbi a R ive r Figure 4-1 13-1444.407PROPOSED IRRIGATION SYSTEM IMPROVEMENTS December 2013City of Pasco Irrigation System Master Plan RO A D 6 8 IR R I G A T I O N T A N K CA P : 2 . 2 8 M G OE : 6 3 9 F T IS L A N D E S T A T E S WE L L RO A D 1 0 8 B P S CA P : 3 , 0 0 0 G P M HA R R I S R O A D B P S CA P : 3 , 1 2 5 G P M RI V E R I N T A K E ST A T I O N CA P : 3 , 0 0 0 G P M LINDA LOVIISA WELL I-182 WELLFIRST PLACE WELLDESERTESTATESWELLNORTHWESTCOMMONSWELLROAD 52 WELLPOWERLINEWELL DESERT SUNSET WELL VILLAGE AT PASCO HEIGHTS WELL PRV PR V PR V 56 0 Z O N E RI V E R I N T A K E ZO N E 639 ZONE 594 ZONE SIRROCO WELL 547 ZONE 60 0 Z O N E PRVPRVPRVPRVPRV WE S T P A S C O ")IR 1 ")IR2 ")IR3 ")IR4")IR5")D4")S2 ")S2 ")S2 ")IR 6 ")S2 ")S3 ")S1 ")T1 ")S2 ")S2 ")D2 4'' 12 ' ' 6' ' 10'' 6'' 12 ' ' 12' ' 4' ' 6'' QU A D R A D R l? l? ")D3 l? l? 6'' 12 ' ' 12'' QUADRA DR l? l? NE W I S O L A T I O N VA L V E ")D3 NE W I S O L A T I O N VA L V E 16 ' ' 12 ' ' 16''8''4''4'' 16 ' ' APPENDIX A 13-1444.407 A-1 Irrigation System Master Plan December 2013 Appendix A: Water Quality Data City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\appendices\appendix a - water quality data.docx APPENDIX A WATER QUALITY DATA Appendix A includes water quality information for the water supplied by the City's irrigation system wells. Available water quality data is attached on the following pages. APPENDIX B 13-1444.407 B-1 Irrigation System Master Plan December 2013 Appendix B: 2007 Residential Water Use Memorandum City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\appendices\appendix b - 2007 residential water use memorandum.docx APPENDIX B 2007 RESIDENTIAL WATER USE MEMORANDUM Appendix B contains a memorandum completed in 2007 to study residential water use patterns and trends. The memorandum is attached on the following pages. PASCO WATER USE STUDY/KEN 1 COPYRIGHT 2013 BY CH2M HILL, INC. • COMPANY CONFIDENTIAL MEMORANDUM Residential Water Use Study TO: Bob Alberts, Public Works Director FROM: Tony Krutsch, Project Manager CH2MHILL DATE: August 3, 2007 INTRODUCTION This Residential Water Use Study looks at residential water consumption at various locations throughout the City of Pasco. Approximately 360 residential housing units were included in the study representing 16 neighborhoods. Neighborhoods were selected to represent a cross section of older and newer construction, with both separate irrigation systems, and those lots dependent on the City domestic water system as the source of supply for irrigation. This study represents an update of a Water Usage Study prepared by the City of Pasco in September 2001. In various locations throughout this technical memorandum, information from September 2001 Water Usage Study is quoted. Water records for each residential lot selected for this study were obtained from the City of Pasco Finance Department for the period of January 2005 through June 2007. After the water records were obtained and entered into a spreadsheet, the records were purged to remove inconsistent data that could have affected the analysis and evaluation. Unlike the September 2001 Water Usage Study, this evaluation is primarily based on the residential lot rather than population. CITY WATER USAGE Chart 1 identifies the average daily residential lot water usage for the 2-year evaluation period for all neighborhoods included in this evaluation. RESIDENTIAL WATER USE STUDY KEN/7-10-08 DEMAND STUDY TECH MEMO.DOC 2 COPYRIGHT 2013 BY CH2M HILL, INC. • COMPANY CONFIDENTIAL Chart 1. Residential Lot Water Usage – gallons per day Water Usage-Entire City 198 226 185 234 483 517 724 724 885 578 268 256 0 100 200 300 400 500 600 700 800 900 1000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec months ga l l o n s p e r d a y / u n i t Series1 The winter average daily residential lot water usage varies between older and newer neighborhoods. In older neighborhoods, winter usage averaged 237 gpd while in newer neighborhoods, winter usage averaged 155 gpd (average of 206 gpd for both older and newer neighborhoods). For those neighborhoods using the City domestic water system for residential lot irrigation, average daily domestic water usage was calculated at 883 gpd per unit, and the summer average daily water usage was calculated at 1,473 gpd per unit. The older Desert Plateau neighborhood had the highest summer average daily water usage at 2,939 gpd per unit. Older neighborhoods in central and east Pasco averaged 1,107 gpd per unit for the summer monthly period. Chart 2 identifies each of the 16 neighborhoods included in this evaluation and the average usage of City domestic water by neighborhood in ac-ft/month during the winter (Dec-Feb) and summer (June-Sept) periods. Chart 2. Seasonal Lot Water Usage – Acre-feet Average Seasonal Usage per Winter vs Summer (Acre-feet/month) 0.0000 0.0500 0.1000 0.1500 0.2000 0.2500 0.3000 A B C D E F G H I J K L M N O P Unit Wa t e r U s a g e P e r U n i t (a c - f t / m o ) RESIDENTIAL WATER USE STUDY KEN/7-10-08 DEMAND STUDY TECH MEMO.DOC 3 COPYRIGHT 2013 BY CH2M HILL, INC. • COMPANY CONFIDENTIAL Chart 3 identifies each of the 16 neighborhoods and the total annual average usage of City domestic water by neighborhood in ac-ft/year. Chart 3. Annual Lot Water Usage – Acre-feet Average Yearly Usage (acre-feet/year) 0.0000 0.2000 0.4000 0.6000 0.8000 1.0000 1.2000 1.4000 1.6000 A B C D E F G H I J K L M N O P Unit Wa t e r U s a g e P e r U n i t (a c - f t / y r ) The average monthly domestic water consumption for all lots in the City was calculated at 0.0412 acre-ft per month and 0.4880 acre-ft per year. For those neighborhoods utilizing a separate irrigation system for irrigation, the average monthly domestic water consumption was calculated at 0.0191 acre-ft per month and 0.2249 acre-ft per year. In neighborhoods relying on the City domestic water supply system for irrigation, the average monthly domestic water consumption was calculated at 0.0729 acre-feet per month and 0.8264 acre- feet per year. The older Desert Plateau neighborhood has the highest monthly average and annual average usage of domestic water at 0.1540 acre-feet per month, and 1.7836 acre-feet per year respectfully. The central and east Pasco neighborhoods, which rely on the City domestic water supply system for irrigation had a monthly average domestic water consumption of 0.0644 acre-feet per month, and an annual water consumption of 0.7229 acre-feet per year. RESIDENTIAL WATER USE STUDY KEN/7-10-08 DEMAND STUDY TECH MEMO.DOC 4 COPYRIGHT 2013 BY CH2M HILL, INC. • COMPANY CONFIDENTIAL Chart 4 provides a comparison of the 16 neighborhoods in terms of winter versus summer usage shown in gallons per day per unit. Chart 4. Seasonal Lot Water Usage – gallons per day Water Usage-Winter vs Summer 0 500 1000 1500 2000 2500 3000 3500 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Unit Areas ga l l o n s p e r d a y / u n i t Chart 5 identifies the average daily water usage in terms of gallons per day per unit of the 16 neighborhoods for the entire City (1), those neighborhoods served by a separate irrigation system (2), and those neighborhoods relying on the City domestic water supply system for irrigation (3). Chart 5. Annual Lot Water Usage for Entire City – gallons per day 1 2 3 S1 S2 712 241 1467 206 188 230 0 200 400 600 800 1000 1200 1400 1600 gallons per day/unit 1-Entire City, 2-W separate irrig, 3-W City irrig S2-summer, S1-winter Water Usage-Annual RESIDENTIAL WATER USE STUDY KEN/7-10-08 DEMAND STUDY TECH MEMO.DOC 5 COPYRIGHT 2013 BY CH2M HILL, INC. • COMPANY CONFIDENTIAL Chart 6 looks at the average daily water usage in terms of gallons per day per unit of all the older neighborhoods evaluated in this report (1), those older neighborhoods served by a separate irrigation system (2), and those older neighborhoods relying on the City domestic water supply system for irrigation (3). Chart 6. Annual Lot Water Usage for Older Neighborhoods – gallons per day 1 2 3 S1 S2 883 293 1473 237 227 2640 200 400 600 800 1000 1200 1400 1600 gallons per day/unit 1-Entire City, 2-W separate irrig, 3-W City irrig S2-summer, S1-winter Water Usage-Old Neighborhoods-Annual Chart 7 looks at the average daily water usage in terms of gallons per day per unit of all the new neighborhoods evaluated in this report (1), those new neighborhoods served by a separate irrigation system (2), and those new neighborhoods relying on the City domestic water supply system for irrigation (3). Chart 7. Annual Lot Water Usage for New Neighborhoods – gallons per day 1 2 3 S1 S2 428 175 934 155 161 1440 200 400 600 800 1000 gallons per day/unit 1-Entire City, 2-W separate irrig, 3-W City irrig S2-summer, S1-winter Water Usage-New Neighborhoods-Annual RESIDENTIAL WATER USE STUDY KEN/7-10-08 DEMAND STUDY TECH MEMO.DOC 6 COPYRIGHT 2013 BY CH2M HILL, INC. • COMPANY CONFIDENTIAL The September 2001 Water Usage Study evaluated 10 houses in 8 neighborhoods (total of 80 homes) throughout the City of Pasco. Chart 8 lists the 8 neighborhoods from the September 2001 report, and also identifies the results from this Residential Water Use Study separated into the same 8 neighborhoods. Chart 8. Average Daily Water Usage – gallons per day Neighborhood September 2001 Study Residential Use Study Sun Willows 601 gpd 771 gpd Ivy Glades 157 gpd 182 gpd Wilson 246 gpd 241 gpd Core City 570 gpd 669 gpd West Pasco 236 gpd 221 gpd I. Estate/S. Meadow 143 gpd 157 gpd Desert Plateau – 1 934 gpd 1,651 gpd Desert Plateau – 2 ---- 285 gpd East Pasco 823 gpd 712 gpd As Chart 8 points out, there are some differences between the two studies. These differences are likely the results of selecting more residential units in each neighborhood in this Residential Water Use Study, and the use of different residents within each neighborhood in each evaluation. Desert Plateau is shown with 2 listings in Chart 8. Desert Plateau – 1 is an older neighborhood which utilizes the City domestic water supply system for irrigation water, while Desert Plateau – 2 is a newer neighborhood with smaller lot size and fewer records available for analysis. One of the calculations presented in the September 2001 report was the estimated percentage of City water used indoors vs. outdoors for those neighborhoods where no separate irrigation supply system was available. Chart 9 compares the results of this Residential Water Use Study with the September 2001 report. Chart 9. City Water Use – Indoor and Outdoor (gallon/year) Neighborhood Avg Mo Use- Winter Total Avg based on Winter Total Actual Use % Indoors This Study (Sept 2001) % Outdoors This Study (Sept 2001) Desert Plateau – 1 6,525 78,295 581,146 13.5% (27%) 86.5% (73%) Sun Willows 3,482 41,786 257,657 16.2% (23%) 83.8% (77%) Core City 9,073 108,878 232,943 46.7% (39%) 53.3% (61%) East Pasco 8,320 99,839 238,160 42.0% (45%) 58.0% (55%) Average 10,038 82,200 327,477 29.6% (33%) 70.4% (67%) RESIDENTIAL WATER USE STUDY KEN/7-10-08 DEMAND STUDY TECH MEMO.DOC 7 COPYRIGHT 2013 BY CH2M HILL, INC. • COMPANY CONFIDENTIAL Chart 10 provides a comparison of the outdoor water usage from the September 2001 report and this Residential Water Use Study for those neighborhoods relying on the City domestic water supply system for irrigation supply. The average square feet of each lot irrigated is from the September 2001 report. Chart 10. Average Annual Gallons per square foot and acre-feet Neighborhood Gross Lot Size1 (sq ft) Avg Lawn Size1 (sq ft) Total Outdoor Water (gallons) Gallons per sq-ft This Study (Sept 01) Density of Homes per gross acre1 Gross Acre- ft per year2 This Study (Sept 01) Acre-ft per year per lawn area 3 Desert Plateau – 1 10,390 8,100 502,851 62 (29) 3.5 5.39 (2.52) 8.30 Sun Willows 6,420 4,900 215,872 44 (31) 4.8 3.18 (2.24) 5.89 Core City 6,820 5,200 124,064 24 (20) 4.9 1.88 (1.55) 3.63 East Pasco 6,970 5,400 138,321 26 (27) 4.8 2.07 (2.17) 3.42 Average 7,650 5,900 245,276 39 (26) 4.5 3.18 (2.12) 5.31 1From September 2001 Water Usage Study 2 Average sq-ft of lawn times number of homes per acre divided by 43,560 sq-ft, then multiplied by gallons per sq-ft, divided by 7.48 3 Total Outdoor Water usage divided by Avg Lawn Size, divided by 7.48 The September 2001 Water Usage Study noted that the Franklin Conservation District estimated that home lawns accounted for 37.7 inches (3.08 ac-ft or 23 gallons per sq-ft) of water annually. With an anticipated loss of up to 20%, the application rate per lawn area would increase to 3.7 ac-ft or 27.7 gallons per sq-ft. In both the Desert Plateau – 1 and Sun Willows neighborhoods, irrigation application rates are much higher than those anticipated by the Franklin Conservation District. The average application rate for irrigated lot area for the entire City of 5.31 ac-ft exceeds the anticipated application rate of 3.7 ac-ft (including losses) by approximately 44%. WATER USE STUDY FINDINGS The following represents findings of this Residential Water Use Study and the evaluation of water consumption throughout the City of Pasco. 1. Residential Indoor Water Usage. In the older residential neighborhoods, daily domestic indoor water usage averaged 237 gallons per day (annual usage of 0.2655 acre-feet per year). For the new residential neighborhoods, daily domestic indoor water usage averaged 155 gallons per day (annual usage of 0.1736 acre-feet per year), or 53% less than older neighborhoods. For RESIDENTIAL WATER USE STUDY KEN/7-10-08 DEMAND STUDY TECH MEMO.DOC 8 COPYRIGHT 2013 BY CH2M HILL, INC. • COMPANY CONFIDENTIAL the new residential neighborhoods, it is highly likely that the plumbing fixtures and devices used have an improved efficiency over those in older neighborhoods. 2. Residential Outdoor Water Usage. For the 16 neighborhoods evaluated in this Residential Water Use Study, the volume of water consumed for domestic purposes was calculated at less than 50% of the total volume consumed for domestic plus irrigation. At the seven neighborhoods, utilizing the domestic water supply system for irrigation, the volume of water consumed for domestic purposes was calculated at about 30% of the total volume consumed for domestic plus irrigation (Over twice as much water was consumed by irrigation of a lot than was used for domestic purposes by each residential unit). In older residential areas (central and east Pasco), irrigation of the landscaped area of each lot was similar to that anticipated by the Franklin Conservation District (3.7 acre-ft per year) at 3.63 acre-ft per year (central) and 3.42 acre-ft per year (east) respectively. The central and east Pasco area residential units are of older construction, landscaping is considered to be mature and well established, and residents are generally considered to have moderate incomes. In newer residential areas (Sun Willows and Desert Plateau), irrigation of the landscaped area of each lot far exceeded the Franklin Conservation District anticipated average of 3.7 acre-ft per year. The Sun Willows neighborhood consists of relatively small landscaped areas (Average of 4,900 square feet) in a newly developed area. Residents are generally considered to have higher incomes. Irrigation application rates in the Sun Willows neighborhood were calculated at 5.89 acre-feet per year or nearly 60% greater than the Franklin Conservation District anticipated average. The Desert Plateau neighborhood evaluated for this study consists of residents with above average lot size, where income levels are generally considered to be high. Landscaping is generally 3 to 5 years old and irrigation application rates were calculated at 8.30 acre-feet per year. This application rate is 124% greater than the Franklin Conservation District anticipated average (3.7 acre-feet per year). Even if the actual irrigated area of lots within this Desert Plateau neighborhood were larger (by 25% to 10,000 square feet) than the average (8,100 square feet) calculated in the September 2001 Water Usage Study for Desert Plateau, the irrigation application rate to landscaped areas would be 6.72 acre-feet per acre or over 80% greater than the Franklin Conservation District anticipated average. APPLICATION TO WATER SYSTEM PLAN Based on this evaluation, the update of the City of Pasco Water System Plan will utilize the residential water consumption figures shown in Chart 11 for the projection of future domestic and irrigation supply demands for the existing and future residential neighborhoods throughout the Pasco Urban Growth Boundary. RESIDENTIAL WATER USE STUDY KEN/7-10-08 DEMAND STUDY TECH MEMO.DOC 9 COPYRIGHT 2013 BY CH2M HILL, INC. • COMPANY CONFIDENTIAL Chart 11. Water Usage in Residential Areas – acre-feet per year per unit Residential Area With Separate Irrigation System (acre-ft/year/unit) With Domestic Water Irrigation (acre-ft/year/unit) Separate Irrigation Demand (acre-ft/year/unit) Old Neighborhood 0.2655 0.7229 0.5031 New Neighborhood 0.1736 0.9644 0.8699 Chart 12 identifies the average day domestic and average day irrigation demand per unit, and per gross acre of residential neighborhoods in terms of gallons per day. Chart 12. Per Unit Water Usage Residential Area With Separate Irrigation System (gpd) With Domestic Water Irrigation (gpd) Separate Irrigation Demand (gpd) unit gross acre unit gross acre unit gross acre Old Neighborhood 240 660 750 3.5 units/acre 840 2,540 3,160 4.0 units/acre 960 2,900 3,300 4.5 units/acre 1,080 2,970 3,380 5.0 units/acre 1,200 3,130 3,560 New Neighborhood 160 1,500 2,250 3.5 units/acre 560 6,300 9,450 4.0 units/acre 640 6,000 9,000 4.5 units/acre 720 6,410 9,610 5.0 units/acre 800 6,750 10,120 APPENDIX C 13-1444.407 C-1 Irrigation System Master Plan December 2013 Appendix C: Operating Agreements City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\appendices\appendix c - operating agreements.docx APPENDIX C OPERATING AGREEMENTS Appendix C contains operating agreements that the City has with Kidwell Farms, Inc. These agreements include the use of the Northwest Commons well and annual contracts for irrigation water use at pivot sites. The agreements are attached on the following pages. P () Ilor lt)-1 (515 Nolth -1"' ,\rerue)Pa.co. \\,a:hingron 99301 rrrr u .|arcrr u.a.!o,. March 19, 2013 Tom Kidwell Water, Inc. 2420 W. Court Pasco, WA 99301 RE: Well Agreement Dear Mr. Kidwell: The City of Pasco acquired from the Northwest Commons subdivision, as part of the preliminary platrequirements, the water rights and well in 2006. The preliminary plat requirements provided that theowner/developer could negotiate a separate agreement with the city if they wish to "iniiiu" to utilizewater from the well for irrigation ofagricultural lands. The city. understands your desire to.use the well to irrigate the agricultural lands you presently lease atthe subdivision site. The city will permit your ur" Ir tt" well in strict ac"ord *ith the folowingstipulations. In exchange for the city's pe#ission to use the well for the 2013 t;;i;;;ason, you !6lrti;:"**, use $l,330 (which includes $t 51.34 applicable state leasehold taxes) by April be responsible for all electrical costs associated with farm irrigation; be responsible^(to the city's satisfaction) ror arr aamage, iaini.nun"" and repair costs associatedwith the use ofthe well during the gro*ing .ruron; adhere to the City's operation instructions; provide evidence of liability insurance ofat least g100,000 and naming the City as an additionalinsured: indemnify and hold the city harmless from any claims whatsoever associated with use of thewell; assure that use of water shall be restricted to those rands within the subdivision ofNorthwestCommons; 8. no chemicals shall be sprayed. in any form on the pump and control systems;9. no chemicals are to be usld in or with the ir.iguiiorr'ryst"_; 10. maintain and test Rp; I l. if chemical is used it must be preapproved by the City. Your signature hereunder will reflect your agreement with the foregoing provisions. l. 2. J. i 5. 6. 7. PUBLIC \'ORKS DEPARTT\IEN'I'(S09) 5.t3-5738 / FAX (S0e) 5!t3_57-17 Sincerely, Ahmad Qayoumi Public Works Director 4 <) AQ/jv Agreed to: Tom Kidwell -Lq-t3 Tom Kidwell Water, Inc. 2420 W. Court Pasco, WA 99301 RE: Well Agreement at Linda Loviisa Subdivision Dear Mr. Kidwell: The-city u-nderstands your desire to use the well_to inigate the agricultural lands you presently lease atthe Linda Loviisa subdivision site. The city will p..."ii you, use ofthe well in strict accord with thefollowing stipulations. In exchange tor the city,s p"..i.ri.n to use the well for tlre 2013 growingseason, you shall: l' pay $2'215 for seasonar use (which includes $252.04 ofappricable state leasehord taxes) byApril 30,2013; be responsible for all electrical costs associated with farm irrigation; be responsible_(to the city's satisfaction) for atl damage, maiiln"n"" and repair costs associatedwith the use ofthe well during the gro*ing ."uron; " ' connect your system at a location approved by the city and provide a meter and valving asdeemed necessary by the City. adhere to the City's operation instructionst pr^ovide evidence of riab ity insurance ofat reast $100,000 and naming the city as an additionallnsuredi *j;mnify and hold the city harmless from any claims whatsoever associated with use of the assure that use of water shal be restricted to those lands within the subdivision o!no chemicals shall be sprayed in any form on the pump anJ"ontrot ,yrt".r; Your signature hereunder wilr reflect your agreement with the foregoing provisions. 4. 7. 2. J^ 6. 8. 9. PUBLTC WORKS DEPARTMENT (s09) 543_5738 i FAX (509) 543_5737 l).O. llor l9l (525 North.1"' \renr:e) pasco. \\'ashingtoD 99301 ' \\\r\\ .pasco_wa. gov March 19, 2013 Sincerely, Ahmad Qayoumi Public Works Director a-t7- t3 AQ/jv Date PUBLIC WORKS DEPARTN,IENT 543-5738 / FAX 543-5737 Tom Kidwell Water, Inc. 2420 W. Court Pasco, WA 99301 RE: Pump Station Agreement Dear Mr. Kidwell: The city purchased ffom Water, Inc., all its facilities including the pump station situated on the FCID canal f;'.{il .:":11li.l-q. The purchase agreemenrprovided that the"parties would provide, ;y .;p;; asreement,ror your potentlal use ot the pump station for inigation of certain agricultural lands owned by you at thattime' Since that agreement, however, you have sord those certain properties; consequently, the city is notobligated by the purchase agreement to provide for your use of tre pump station for other rands. The city understands, however, your desire to use the pump station to irrigate the agricultural lands youpresently lease from the washington State Department of Natural ResourceJ IDNR;. -Based on our recenrdiscussions, the city will permit your use of the pump station in stnct accord with the following stipulations.In exchange for the city's permission to use the pump station for the 2013 g.o*ing ."u*n, yoo !hu , pay $2,215 for the seasonal use of the plmp_station and $9O/year lease for pump equipment (whichincludes $262.2t ofapplicable state teasehoid tax) by Aprit :q ZOt:. be responsible for all electrical costs associated *lth-purnp ,#on; be responsible for relocation, electrical costs and maintenance ofequipment pump. be responsible (to the city's satisfaction) for all maintenanc" and repur. co.ts associated with the useofthe pump station during the growing season; provide evidence of liability insurance of at least $100,000 and naming the city as an additionalinsured; indemnifr and hold the city harmless from any craims whatsoever associated with use ofthe pumpstation; be responsible for all costs whatsoever to acquire water from the FCID canal; assure that use of water transferred through the pump station shall be restricted to those lands withrnSection l6 which you have legal authority to use. P.O. Ilox lr)l (515 Nonh -t'.\renue) P_asco. \\'ashiDr.:l(Jn 99101 \\'\\ \\.pa\c()-\\ a so\. March 19, 2013 Your signature hereunder will reflect your agreement with the foregoing provisions. l 2. 3. 4. 5. 6. 7. 8. 2-tq- (4 PUBLTC \\'ORKS DEpARTt,tENl'(509) 543-5738 / FAX (509) 54-1-5737 P.O. Iin 293 1525 Nordr i"'Arc'nue)l)asco. \\'ashington 99301 urrrr'.pasco ua.ror March 19, 2013 Tom Kidwell Water, lnc. 2420 W. Court Pasco, WA 99301 RE: Well Agreement at Rd 52 Dear Mr. Kidwell: The City understands your desire to use the well to irrigate the agricultural lands you presently lease at the Rd 52 site. The City will permit your use of the well in strict accord with the following stipulations. In exchange for the city's permission to use the well for the 2013 growing season, you shall: l. pay $2,215 for seasonal use (which includes $252.04 ofapplicable state leasehold taxes) by April 30, 2013; 2. be responsible for all electrical costs associated with farm inigation; 3. be responsible (to the city's satisfaction) for all damage, maintenance and repair costs associated with the use of the well during the growing season; 4. connect your system at a location approved by the City and provide a meter and valving as deemed necessary by the City. 5. adhere to the City's operation instructions; 6. provide evidence of liability insurance ofat least $100,000 and naming the City as an additional insured; 7. indemnify and hold the City harmless from any claims whatsoever associated with use of the well: 8. assure that use of water shall be restricted to those lands within the subdivision of; 9. no chemicals shall be sprayed in any form on the pump and control systems; Your signature hereunder will reflect your agreement with the foregoing provisions. AQ/jv Agreed to: 3-\9--t3 Tom Kidwell Date APPENDIX D 13-1444.407 D-1 Irrigation System Master Plan December 2013 Appendix D: Project Cost Estimates City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\appendices\appendix d - project cost estimates.docx APPENDIX D PROJECT COST ESTIMATES Appendix D contains detailed cost estimating data used to determine project costs as presented in Section 4. Irrigation Mains Irrigation main project cost estimating data was prepared using bid tabulations from nearby irrigation districts. Some of the City of Pasco's recent bid tabulations were also used. The costs assume PVC irrigation pipe. Construction costs represented total estimated construction cost per linear foot (LF) of pipe and included sales tax. A 10 percent contingency was added to bid costs to calculate a construction subtotal. To calculate project costs, a 35 percent contingency was added to account for administrative, legal, and engineering costs. Table D-1 summarizes irrigation main project costs. Table D-1 Irrigation Main Project Cost Summary Pipe Diameter (inches) Project Cost per Linear Foot ($/LF) 4 65 6 75 8 105 10 115 12 125 16 135 18 145 20 150 24 170 Well Rehabilitation and Assessment The total project cost for well rehabilitation work is estimated at $225,500. Well rehabilitation costs are summarized in Table D-2 and are based on the following assumptions:  New pump and motor costs are not included  The City will conduct the specific capacity testing recommended at each well  The City will conduct well video surveys  Administrative, legal, and engineering costs for this project are estimated at 50 percent of the construction cost instead of 35 percent to account for additional on-site engineering representation associated with rehabilitation activities. Rehabilitation activities typically require more on-site representation than construction of new facilities. 13-1444.407 D-2 Irrigation System Master Plan December 2013 Appendix D: Project Cost Estimates City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\appendices\appendix d - project cost estimates.docx Table D-2 Well Rehabilitation and Assessment Project Cost Summary Description Quantity Unit Unit Price Total Desert Sunset, Sirocco, Northwest Commons, Island Estates, I-182, and Powerline Road Wells Mobilization and Demobilization 6 LS $1,500.00 $9,000.00 Disconnect, Remove, and Reinstall Existing Equipment 72 HR $350.00 $25,200.00 Specific capacity testing 1 12 HR $0.00 $0.00 Onsite Hourly Work to Perform Rehabilitation 96 HR $350.00 $33,600.00 Miscellaneous Equipment and Chemicals 6 LS $1,500.00 $9,000.00 Video Survey1 12 EA $0.00 $0.00 Disinfection 6 EA $1,000.00 $6,000.00 Wastewater Containment and Disposal 6 EA $2,500.00 $15,000.00 Subtotal $97,800.00 First Place and Desert Estates Wells Mobilization and Demobilization 2 LS $1,500.00 $3,000.00 Disconnect, Remove, and Reinstall Existing Equipment 24 HR $350.00 $8,400.00 Specific Capacity Testing 1 4 HR $0.00 $0.00 Onsite Hourly Work to Perform Rehabilitation 16 HR $350.00 $5,600.00 Miscellaneous Equipment and Chemicals 2 LS $1,000.00 $2,000.00 Video Survey1 4 EA $0.00 $0.00 Disinfection 2 EA $1,000.00 $2,000.00 Wastewater Containment and Disposal 2 EA $2,500.00 $5,000.00 Subtotal $26,000.00 Road 52 and Linda Loviisa Wells Specific Capacity Testing1 4 HR $0.00 $0.00 Video Survey1 2 EA $0.00 $0.00 Disinfection 2 EA $1,000.00 $2,000.00 Subtotal $2,000.00 Subtotal $125,800 Construction Contingency (10 percent) $12,580 Sales Tax (8.6 percent) $11,900 Construction Subtotal $150,280 Administrative, Legal, and Engineering Costs (50 percent2) $75,140 Rounded Estimated Project Cost $225,500 Notes 1. Assumes City will conduct specific capacity testing and well video surveys. 2. Administrative, legal, and engineering costs are higher due to increased on-site engineering representation for rehabilitation activities. 13-1444.407 D-3 Irrigation System Master Plan December 2013 Appendix D: Project Cost Estimates City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\appendices\appendix d - project cost estimates.docx Village of Pasco Heights Well Replacement The total project cost to replace the Village of Pasco Heights Well is estimated at $172,400. Itemized costs are summarized in Table D-3 and are based on the following assumptions:  The well pump and motor in use at the existing Village of Pasco Heights Well are in good condition and can be reused in the new well.  Costs for infrastructure expansion for connection to existing water system are not included  No permitting costs are included  No cost for a well video survey is included since the City can perform the survey The total cost includes:  Aquifer and well performance testing (e.g., step-rate and constant-rate pumping tests)  Plumbness and alignment testing  Water quality analysis  100 feet of 10-inch diameter PVC discharge piping to connect to the existing irrigation system General New Irrigation Well Construction A general-use project cost was developed for use in budgeting construction of a new irrigation water supply well. The total estimated project cost is $616,000. Itemized costs are summarized in Table D-4. This estimated project cost can be used on a per-well basis and is based on the following generalized assumptions:  The total depth of the new well is 200 feet  The diameter of the well is 16 inches  The length of the stainless steel screen is 20 feet  The pump is a vertical turbine type pump with a 150-HP motor equipped with a variable-speed drive  500 feet of 10-inch diameter PVC discharge piping will be needed to connect the well to the existing irrigation system  The City will perform well video surveys The total cost includes:  Aquifer and well performance testing (e.g., step-rate and constant-rate pumping tests)  Plumbness and alignment testing  Water quality analysis It is possible that individual well construction costs may vary from those presented here due to fluctuations factors such as depth, diameter, production rates, aquifer characteristics, and 13-1444.407 D-4 Irrigation System Master Plan December 2013 Appendix D: Project Cost Estimates City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\appendices\appendix d - project cost estimates.docx hydraulic conditions. To take these variations into account, a contingency of 20 percent was used to estimate the construction cost of the well. The project cost included in Table D-4 is a representative cost used for budgeting purposes only. Table D-3 Village of Pasco Heights Well Replacement Project Cost Summary Description Quantity Unit Unit Price Total Mobilization and Demobilization 1 LS $10,000.00 $10,000.00 Site Preparation 1 LS $5,000.00 $5,000.00 Drilling 20-inch Diameter Surface Seal 20 LF $240.00 $4,800.00 Furnish and Install 20-inch Diameter Casing 20 LF $100.00 $2,000.00 16-inch Diameter Drill Shoe 1 EA $1,000.00 $1,000.00 16-inch Diameter Drilling 180 LF $120.00 $21,600.00 Furnish and Install 16-inch Diameter Casing 200 LF $70.00 $14,000.00 Install Surface Seal 20 LF $40.00 $800.00 16-inch Diameter Shoe Cut 1 EA $4,000.00 $4,000.00 Hourly Operations 8 HR $525.00 $4,200.00 Well Casing Alignment 1 EA $500.00 $500.00 16-inch Diameter Telescoping Stainless Steel Screen 10 LF $200.00 $2,000.00 16-inch Diameter Riser Pipe and Tail Pipe 15 LF $70.00 $1,050.00 Silica Sand 40 BG $16.00 $640.00 Installation of Screen Assembly 16 HR $525.00 $8,400.00 Well Development 16 HR $325.00 $5,200.00 Remove existing pump and motor and Reinstall in New Well 180 LF $20.00 $3,600.00 Furnish and Install Discharge Piping 100 LF $85.00 $8,500.00 Operate Test Pump 30 HR $240.00 $7,200.00 Well Disinfection 1 LS $500.00 $500.00 Well Head Completion 1 LS $350.00 $350.00 Water Quality Analysis 1 LS $1,500.00 $1,500.00 Subtotal $106,840 Construction Contingency (10 percent) $10,685 Sales Tax (8.6 percent) $10,110 Construction Subtotal $127,630 Administrative, Legal, and Engineering Costs (35 percent) $44,670 Rounded Estimated Project Cost $172,400 13-1444.407 D-5 Irrigation System Master Plan December 2013 Appendix D: Project Cost Estimates City of Pasco k:\tac_projects\13\1444 - pasco water resources study\407 plan preparation\irrigation system master plan\appendices\appendix d - project cost estimates.docx Table D-4 New Irrigation Well Project Cost Summary Description Quantity Unit Unit Price Total Mobilization and Demobilization 1 LS $15,140.00 $15,140.00 Site Preparation 1 LS $5,000.00 $5,000.00 Drilling 20-inch Diameter Surface Seal 20 LF $240.00 $4,800.00 Furnish and Install 20-inch Diameter Casing 20 LF $100.00 $2,000.00 16-inch Diameter Drill Shoe 1 EA $1,000.00 $1,000.00 16-inch Diameter Drilling 180 LF $120.00 $21,600.00 Furnish and Install 16-inch Diameter Casing 200 LF $70.00 $14,000.00 Install Surface Seal 20 LF $40.00 $800.00 16-inch Diameter Shoe Cut 1 EA $4,000.00 $4,000.00 Hourly Operations 8 HR $525.00 $4,200.00 Well Casing Alignment 1 EA $500.00 $500.00 16-inch Diameter Telescoping Stainless Steel Screen 20 LF $200.00 $4,000.00 16-inch Diameter Riser Pipe and Tail Pipe 15 LF $70.00 $1,050.00 Silica Sand 40 BG $16.00 $640.00 Installation of Screen Assembly 16 HR $525.00 $8,400.00 Well Development 16 HR $325.00 $5,200.00 New Well Pump and 150-HP Motor with Variable-Speed Drive 1 LS $125,000 $125,000.00 Furnish and Install Discharge Piping 500 LF $85.00 $42,500.00 Operate Test Pump 30 HR $240.00 $7,200.00 Well Disinfection 1 LS $500.00 $500.00 Well Head Completion 1 LS $350.00 $350.00 Well House 1 LS $37,000.00 $37,000.00 Electrical, Instrumentation, and Controls 1 LS 38,450.00 38,450.00 Water Quality Analysis 1 LS $1,500.00 $1,500.00 Subtotal $350,030 Construction Contingency (20 percent1) $70,000 Sales Tax (8.6 percent) $36,125 Construction Subtotal $456,160 Administrative, Legal, and Engineering Costs (35 percent) $159,660 Rounded Estimated Project Cost $616,000 Notes 1. Construction contingency is higher to account for uncertainty in well construction, aquifer characteristics, and hydraulic conditions.