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Home My WebLink AboutResolution 2010-096 adopting the 2010 parks, recreation, trails, and open space master planMARANA RESOLUTION N0.2010-96 RELATING TO UTILITIES; ADOPTING THE 2010 POTABLE WATER MASTER PLAN WHEREAS the Marana Municipal Water System utilizes the Potable Water Master Plan as the key guidance document to identify the capital components required for both existing and future customers; and WHEREAS the 2010 Potable Water Master Plan is a subordinate document to the General Plan; and WHEREAS the goal of the Town is to plan for the future development and construction of adequately sized, integrated infrastructure for future customers as the Town grows; and WHEREAS the Plan provides for system integration and reliability, and charts the appropriate fees to accommodate the long-term infrastructure development requirements of the utility; and WHEREAS the Mayor and Council find that adoption of the Plan is in the best interest of the Town. NOW, THEREFORE, BE IT RESOLVED BY THE MAYOR AND COUNCIL OF THE TOWN OF MARANA, ARIZONA, AS FOLLOWS: SECTION 1. The 2010 Potable Water Master Plan is hereby adopted in full, including Chapter 4 and Exhibits 5-2, 5-3, 7-1, 7-2, and 7-3, which have been removed from the public version of the Plan for security reasons pursuant to the Public Health Security and Bioterrorism Preparedness Response Act. SECTION 2. A full and correct copy of the public version of the 2010 Potable Water Master Plan, with Chapter 4 and Exhibits 5-2, 5-3, 7-1, 7-2, and 7-3 removed for security reasons pursuant to the Public Health Security and Bioterrorism Preparedness Response Act, is attached as Exhibit A to this resolution and incorporated here by this reference. SECTION 3. The various Town officers and employees are authorized and directed to perform all acts necessary or desirable to give effect to this resolution. Resolution No. 2010-96 - 1 - 2010 Potable Water Master Plan PASSED AND ADOPTED BY THE MAYOR AND COUNCIL OF THE TOWN OF MARANA, ARIZONA, this 5~ day of October, 2010. Mayor E Honea ATTEST: cel Bronson, Town Clerk Resolution No. 2010-96 - 2 - 2010 Potable Water Master Plan APPROVED AS TO FORM: ,~. • .~, TABLE OF CONTENTS ®~ • EXECUTIVE SUMMARY Introduction ............................................................................................................................................. ES-1 Planning Area .......................................................................................................................................... ES-1 Water Pressure Zones .............................................................................................................................. ES-1 Growth/Phasing .............................:........................................................................................................ ES-1 Water System Demand Pattern ................................................................................................................ ES-2 Wells------------------------ -------------------------------------------------------------------------------- ------------------------------------------- -3 Storage ..................................................................................................................................................... ES-3 Booster Stations ....................................................................................................................................... ES-3 Capital Improvements Plans .................................................................................................................... ES-3 CHAPTER 1 -MASTER PLAN OVERVIEW 1.1 Introduction ................................................................................................................................... 1-1 1.2 Key Issues ...................................................................................................................................... l-1 1.3 Water System Planning Horizon ............ ..... l-2 1.4 Limits of Water Service Area ........................................................................................................ l-2 1.5 Water Resources and Development ............................................................................................... l-2 1.6 Water Quality Regulations ............................................................................................................ 1-2 1.7 System Improvements for Existing Customers ............................................................................. l-2 1.8 System Improvements for Growth ................................................................................................ l -3 1.9 Capital Expenditures and Timing ................................................................................................. 1-3 CHAPTER 2 -REGULATORY REQUIREMENTS 2.1 Federal Requirements .................................................................................................................... 2-1 2.1.1 Safe Drinking Water Act {SDWA) .............................................................................................2-1 2.1.2 Ground Water Rule (GWR} ........................................................................................................2-1 2.1.3 Public Health Security and Bioterrorism Preparedness and Response Act ...................................2-2 2.1.4 Occupational Safety and Health Administration (OSHA) ...........................................................2-3 2.2 State Requirements ........................................................................................................................2-3 2.2.1 Arizona Department of Environmental Quality (ADEQ} ........................................................... 2-3 2.2.2 Arizona Department of Water Resources (ADWR} ....................................................................2-5 2.3 Local Requirements .......................................................................................................................2-8 2.3.1 Town of Marana Water Policies ................................................................................ .....2-8 2.3.2 Town of Marana Water Code .....................................................................................................2-8 CHAPTER 3 -WATER SYSTEM DEVELOPMENT POLICIES 3.1 Non-potable Water System Policy ................................................................................................3-1 3.2 Fire Flow Policy .............................................................................................................. ..............3-1 3.3 Storage Capacity Policy .................................................................................................................3-2 3.4 System Pressure Policy ..................................................................................................................3-2 3.5 Looped Water Systems Policy ............................ ............................................................. ..... .........3-3 3.6 Backup Generator Policy ................................................................................................. ..............3-3 3.7 SCADA Policy ................................................................................................................ ..............3-3 3.8 Water Quality Control Policy .......................................................................................... .............. 3-3 3.9 Valve and Pump Facility Maintenance Policy ................................................................. ..............3-4 3.10 Land Acquisition Policy ........................................................................ .3-4 3.11 Existing System Upgrade Policy ..................................................................................... .............. 3-4 3.12 Oversized Refund and Credit Policy ............................................................................... .............. 3-5 Town of Marana 20'IO Potable Water System Master Pian ,pw.~ OF -; w_.. __~ ..__ _.._,.._ - ~.!31i2010 DRAFT ~--~-~~v- __ _ ~, ~~,~~.~:~.~ ,~ , ~ TABLE OF CONTENTS 3.13 Water System Development and Financing Policy .......................................................................3-5 3.13.1 Existrng System L?Pgrades ......................................................................................................3-5 3.13.2 ~k~'ater System Improvements for Growth and Expansion ......................................................3-5 3.14 Project Prioritization Policy ...........................................................................................................3-6 3.15 Water Utility Construction Standards Policy ................................................................................3-b 3.17 Drought Preparedness Plan ............................................................................................................3-6 CHAPTER 4 -EXISTING SYSTEM ANALYSIS "THIS CHAPTER HAS BEEN REMOVED FOR SECURITY PURPOSES UNDER THE PUBLIC HEALTH SECURITY AND BIOTERRORISM PREPAREDNESS RESPONSE ACT" CHAPTER 5 -FUTURE SYSTEM ANALYSIS 5.1 General ........................................................................................................................................ 5-12 5.2 Buildout System Demands ............................................................................................................5-2 5.3 Year -5, -10, and -20 System Demands .........................................................................................5-3 5.4 Future System Sizing and Requirements .......................................................................................5-5 5.4.1 Source Capacity .......................................................................................................................... 5-5 5.4.2 Storage ....................................................................................................................................... 5-b 5.4.3 Booster Stations ......................................................................................................................... 5-7 5.4.4 Gravity, Storage Transmission System ........................... .............................................................. 5-8 5.5 Proposed Facilities -Future System Requirements__________________________________________________________________5-] 0 CHAPTER 6-INFRASTRUCTURE COST PROJECTION 6.1 Cost Projection Assumptions and Criteria .....................................................................................6-1 6.1.1 Pipeline Replacement ................................................................................................................. 6-1 6.1.2 Installation of ~~'ater 11Zains ........................................................................................................ 6-1 6.1.3 Installation of ik~Telded Steel Reservoirs ......................... .............................................................. 6-1 6.1.4 Installation of Buried Concrete Reservoirs ..................................................................................6-2 6.1.5 Installation of Elevated Reservoirs .................................................... .6-2 ........................................ 6.1.6 ~~'ell Installations ........................................................................................................................ b-2 6.1.7 Boaster Stations ......................................................................................................................... b-2 6.1.$ Interstate 10, Railroad, and CAP Crossings .................................................................................6-2 6.1.9 Engineering and Contingencies ......................................... .. 6-2 ....................................................... 6.2 10-Year (2020) Capital Improvement Plan Cost Projection ..........................................................6-2 6.3 Buildout Capital Improvement Plan Cost Projection .................................................................... 6-3 CHAPTER 7 - IMPLEi'VIENTATION 7.1 Introduction ................................................................................................................................... 7-4 7.2 Capital Improvements Implementation ......................................................................................... 7-4 7.3 Source, Storage, and Booster Capacity Evaluation ....................................................................... 7-4 7.4 Connection Fees and Rates ............................................................................................................ 7-9 7.4.1 Infrastructure Impact Fee........... ................ 7-9 ................................................................................ 7.4.2 Gravit~• Storage and Renewable Water Resource Fee .................................................................. 7-9 ~O'~' ~ OF Town of Marana 2010 Potable Water System Master Plan , ;~-;, ..v _ , .-..._.N...~..-......-.....-...._, ~~~ .~.... ._.........~......,.....~~.._.-...~....~_. __ _ ..___ ._, ~. ,.._.._.~..W.. ,...~.._.._._ae.~_w_.v_.~.._ .._ __ ._ _.. '~RIF»*~I~ TABLE OF CONTENTS L#ST OF EXHIBITS (Exhibits appear at end of each section) Exhibit ES-1:2010 Marana Water Master Planning Area Exhibit ES-2: Water Demand Projections Exhibit ES-3: Pressure Zones Exhibit 4-l :Existing System Water Service Area Location Map Exhibit 4-2: Palo Verde Service Area Exhibit 4-3: Airport Service Area Exhibit 4-4: Airline/Lambert/Saguaro Springs/La Puerto and Falstaff Service Areas Exhibit 4-5: Cortaro/4shrin Service Area and Hartman Vistas Service Area Exhibit 4-6: Picture Rocks/Continental ReservelSprings Service Area Exhibit 4-7: North Marana Service Area Exhibit 5-1: Town of Marana General Plan 2007 and Specific Plans Exhibit 5-2: "This Exhibit has been removed for security purposes under the Public Health Security and Bioterrorism Preparedness Response Act" Exhibit 5-3: "This Exhibit has been removed for security purposes under the Public Health Security and Bioterrorism Preparedness Response Act" LIST OF FIGURES Figure 1. Water Demand Projections._____________________ ________ ES-2 ---------------------------------------------------------------- Figure 2. 2009 Water Demand Summary___________________________ ------------------------------------------------------------ ES-2 LIST aF TABLES Table 4-1. Connections and Usage Summary ______________________________________________________ _________________________4-1 Table 4-2. Marana Water Pressure Zone Boundaries 4-2 Table 4-3. Existing Well Capacity Summary._________________ _____ --------------------------------- _____-___________________ 4-3 Table 4-4. Existing Reservoir Summary ---------------------------------------_--...----------------- ----------------------___ 4-4 Table 4-5. Existing Booster Station Summary ._____________________ ---------------------------- __ 4-5 ----------------------- Table 4-6. Existing Water System Capacity Summary__________________________________ ------- ------------------------- 4-S Table 4-7. Equivalent Dwelling Unit Meter Factors______________________________________________ _________________________ 4-6 Table 4-8. Existing Potable Water Usage and Demand Summary__________________________ _________________________ 4-7 Table 4-9. Existing Well Capacity Requirements________________ _ 4-8 Table 4-10. Existing System Fire Flow Requirements___________________________________________ _________________________ 4-9 Table 4-11. Existing Reservoir Capacity Requirements_________________________________________ _________________________ 4-10 Table 4-12. Existing Booster Capacity Requirements____________________________________________ _________________________4-10 Table 4-13. Existing System Capital Improvement Requirements____________ _ 4-11 Table 5-1. Planning Density by Land Use Category_____________________________________________________ __________________.5-1 Table S-2. Specific Plans Used in Flow Projection_______________________________________________________ __________________.5-2 Table 5-3. Buildout Projection Summary-------------------------------------------------------------------- ------------------.5-2 Table 5-4. Phasing of Specific Plan Development (as Percent of Buildout)__________________ __________________ 5-3 Table 5-5. 2015 Projected Demand Summary_____________________ 5-4 Table 5-b. 2020 Projected Demand Summary______________________________________________ --------------- _________ 5-4 --------- Table 5-7. 2030 Projected Demand Summary______________ ----------------------------------------------- ________ 5-5 ---------- Table 5-8. Future Source Capacity Requirements Summary ________________________________________ __________________ 5-6 Table 5-9. Future Storage Capacity Requirements Summary___________________________ ------------- _ 5-7 --------------- --- Table 5-10. Future Booster Station Capacity Requirements Summary__________________________ __________________ 5-8 Table 5-11. Transmission Line Extension Sumrnary,____________________________________________________ __________________ 5-9 Town of Marano 2010 Potable Water System >lllaster Plan ~,~311201 Q DRAF I TABLE OF CONTENTS Table 5-12. 10-Year Capital Improvement Projects_______ _ __ S_1Q ----------------------------------------------------------- -- Table 5-13. Buildout Capital Improvement Projects_______________ _ 5-11 Table 6-l : Marana Water 10-Year (2020} Capital Improvement Projects.____________ ________ 6-4 ------------------- Table 6-2: Marana Water Buildout Capital Improvement Projects__________________________________________ b-5 Table 7-] . "This Exhibit has been removed for security purposes under the Public Health Security and Bioterrorism Preparedness Response Act" Table 7-2. "This Exhibit has been removed for security purposes under the Public Health Security and Bioterrorism Preparedness Response Act" Table 7-3. "This Exhibit has been removed for security purposes under the Public Health Security and Bioterrorism Preparedness Response Act" ~pati r~ Town of Marana 20'!0 Potable Water System Master Plan ~ ~_; ~ )- ~ G ~ ~ DRAFT ~~ °~ ' • • ~ ABBREVIATIONS :. • 1 AAC Arizona Administrative Code ACC Arizona Corporation Commission ADD Average Daily Demand ADEQ Arizona Department of Environmental Quality ADOSH Arizona Division of Occupational Safety and Health ADWR Arizona Department of Water Resources AFY acre feet per year AMA Active Management Area ARS Arizona Revised Statues AWWA American Water works Association AWS Assured Water Supply AZPDES Arizona Pollutant Discharge Elimination System BMP Best Management Practice BOR Bureau of Reclamation CAGRD Central Arizona Groundwater Replenishment District CAP Central Arizona Project CAWCD Central Arizona Water Conservation District CD? Capital Improvement Project CWA Clean Water Act CWS Community Water Systems EDU equivalent dwelling unit EOP Emergency Operation Plan EPA Environmental Protection Agency f'tls feet per second gpad gallons per acre per day gpcd gallons per capita per day gpd gallons per day gpm gallons per minute GRW Ground Water Rule IFC International Fire Code IPC International Plumbing Code MCL Maximum Contaminant Level MDWID Metropolitan Domestic Water Improvement District MG million gallons MCPCCP Modified Non-Per Capita Conservation Program MFR multi-family residence NPDES National Pollutant Discharge Elimination System OSHA Occupational Safety and Health Administration PCB polychlorinated bi-phenyl PCDEQ Pima County Department of Environmental Quality PDD Peak Daily Demand PHD Peak Hourly Demand PHSBPRA Public Health Security and Bioterrorism Preparedness and Response Act ppb parts per billion ppdu persons per dwelling unit PRV pressure reducing valve psi pounds per square inch PWS Public Water Systems RTC Remote Terminal Unit SCADA supervisory control and data acquisition SDWA Safe Drinking Water Act SFR single family residence SMCLs Secondary maximum containment levels TCR Total Coliform Rule WHP Wellhead Protection Program Town ofi Marana 2010 Potable Water System Master Plan _..._ ~..~. _...~~ ., w ... , .. __ .__.__ ~. . ~ ...... _ _ ... .. ~ :m.~.~ B/3~1201(~ t?RAFT • • EXECUTIVE SUMMARY -~ INTRODUCTION The Town of Marana Water Department (Marana Water) 2010 Potable Water System Master Plan is a comprehensive planning document used to project the infrastructure and water resource requirements for the Town of Marana. This executive summary is to~provide an overall picture of the Marana Water's potable system in terms of system demands and infrastructure requirements including wells, reservoirs, and booster stations. The approach for the Master Plan is to evaluate the system on a capacity basis to determine the needs of existing and future customers, to set forth a schedule for the construction of new capital improvements, and to provide an estimate of the cast for the required improvements. The cost estimates can be used in the development of the budgets, rates, and connection fees for Marana Water. PLANNING AREA The planning area for the Master Plan is identified on -. ~ -: The planning area is similar to the planning area used in the Town of Marana 2007 General Plan, excluding La Asa, areas served or to be served by other water providers such as Tucson Water and Red Rock, and areas anticipated with low development potential. As depicted on , the Marana Water planning area is situated in both Pima and Pinal counties, and encompasses portions of both the Tucson and the Pinal Active Management Areas {AMAs). WATER PRESSURE ZONES The Marana Water planning area is separated into pressure zones based on elevation. The pressure zone delineations are typically consistent with zones used by adjacent municipal water providers. The zone boundaries are established at approximate 100-foot elevation differences. The overall Marana Water pressure zone delineations are shown on Based on elevation, the buildout Marana Water system is separated into ten {10} pressure zones: the V, W+, X, Y, Z, A, B, C, CR (Continental Reserve), and PR (Picture Rocks) Zones. The Marana Water X Zane consists of four subzones {X1a, X1b, X1c, and X1 d) that are contiguous in area but are not anticipated to be interconnected within the 5-, 10-, and 20-year planning horizons. The Y Zone includes three subzones (Y1, Y2, and Y3} that are non-contiguous, and the Z Zone includes two subzones (Z1 and Z2} that are non-contiguous. GROWTH/PHASiNG Marana Water has coordinated with the Town of Marana Planning and Zoning Department to develop population and growth projections for its service area. Using the 2007 General Plan and assumptions regarding land use densities, Marana Water is projected to serve approximately 169,604 equivalent dwelling units (EDUs) at buildout, including approximately 74,532 residential units. Based on the census data of 2.7 persons per residential unit in the area, Marana Water is projected to serve approximately 201,200 people at buildout. Marana Water has evaluated potable water demands within the Town of Marana 2007 General Plan area, including those demands served by other water providers. depicts the areas anticipated to be served by different water providers and their associated buildout potable water demand projections. Marana Water is projected to serve approximately 61,554 acre-feet per year (AF'I~ of potable water demands at buildout within the 2010 water master planning area. In comparison, the potable water demands for the Tucson Water intended service areas within the Town of Marana 2007 General Plan area are projected to be approximately 7,079 AFY. The rate of growth within the 5-year (2015) and 10- year (2020) planning horizons is based on Specific Plan growth information provided by the Town of Marana Planning and Zoning Department. The rate of growth between the 10- to 20-year {2030) planning horizons is assumed at the same growth rate as projected within the 10-year planning horizon. below shows the existing and projected water demands for 2015, 2020, 2030 and buildout. ~pwn Gt Town of Marana 2010 Potable Water System Master Plan ,--W. , __~ ._. w, .._....~........_ , , ~ , ~:_ _ ... T_.M.___ :~ ,~~i;~~~ EXECUTIVE SUMMARY WATER SYSTEM DEMAND PATTERN Potable water systems in the southwestern United States are generally designed to accommodate peak demands. Peak day demands {PDD) are generally twice the annual average daily demands and 1.5 tunes Page ES-2 the peak month average daily demand. shows the Marana Water's potable water deliveries in 2009 (by month). Figure 2. 2009 Water Demand Summary (Per the Marana Water ADWR Annual Report) 250 zoo b a ~ 150 v A v ~ 100 b a~ M v ~ 50 0 -I- Jan Feb Mar .~pr I~iay Jun Jul rlug Sep Qct Nov Dec 2009 Town of Marana 2Q10 Potable Water S stern Master Plan .~.._ ...,~.w~..~~.w.~..~. ~~ e wm ... ~, .- .n~,w........~.~~..~.eb~M.~.~~~b,_~~~....~~,.~mm.~r,.~~.~ a~ ,..~. 8/3?I2020 DRAFT EXECUTIVE SUMMARY WELLS A complete evaluation of the well, storage, and booster capacity requirements for the Marana Water system was performed in the Master Plan. The well capacity requirement is based on providing PDD with the largest well out of service. At buildout, the projected PDD for Marana Water is approximately 76,322 gallons per minutes (gpm}. In addition, a total of 9,100 gpm reserve well capacity is anticipated, resulting in a total well capacity requirement of 85,422 gpm for Marana Water at buildout. Marana Water currently has an existing well capacity of 15,417 gpm. Assuming the existing Marana Water wells remain the same production capacity, approximately 47 additional wells at a capacity of 1,500 gpm each will be required to meet the well capacity requirements of Marana Water at buildout. STORAGE Storage capacity requirements for Marana Water are based on 1.5 times of the Average Daily Demand (ADD), plus fire flow storage requirement. It is recommended, when practical, at least 25 percent of the ADD (if not all) be stored in gravity reservoirs. Gravity storage provides operational flexibility and reserve during emergencies such as sustained power outages. The storage requirement for Marana ~~Vater at buildout is approximately 85 million gallons, out of which 26 million gallons is recommended as gravity storage. Marana Water has an existing storage capacity of approximately 8 million gallons. To meet the storage capacity requirement at buildout, 77 million gallons of additional storage will be required. BOOSTER STATIONS Booster station capacity requirements are based on providing PDD plus fire flow or peak hour demand (PHD), whichever is greater, for the pressure zones without gravity storage. The booster station capacity requirement may be reduced to providing PDD for the zones with adequate gravity storage capacity for fire flow and peak hour fluctuations. The capacity of each booster station is recommended to be 3,000 gpm or less to rninimi~e the area of impact when the booster station is out of service. Approximately 35 additional booster stations, ranging from 1,500 to 3,000 gpm, will be required for Marana Water at buildout. Page ES-3 CAPITAL IMPROVEMENTS PROJECTS The 10-year and buildout Capital Improvement Projects (CIP) for Marana Water have been developed in this Master Plan so that the costs for the improvements can be allocated to the individuals they serve. It is noted that the cost estimates are based on present day prices for the involved design and construction. These values will need to be properly inflated when preparing budgets and securing funds. The present day cost estimates for existing system upgrades (to bring the water system up to the Marana Water's current standard of service) is approximately $7.0 million. The majority of these projects are water main replacements system in the older service areas. Because these improvements are required within the existing system and may be considered as operation and maintenance related expenditures, these upgrades should be generally funded by existing water system rates. Present day cost estimates for growth-related 10- year and buildout capital improvements are approximately $26.5 million and $143 million, respectively. The cost estimates for gravity storage and transmission mains are approximately $67.4 million at buildout. The cost opinions exclude those casts required for the delivery and treatment of alternative water sources. The cost components associated with the implementation of the growth- related improvements are generally funded by impact/connection fees allocated to future Marana Water customers. Tawn of Marana 2010 Potable Water System Master Plan ~..a_.u..-.. 8I31~Z~t(J t~RAF7' ,~ °'. ayq ~~ Red Rork Le end 9 2007 Town of Marana General Plan Boundary ____. ~: ~. 2010 Water Master Plannin Area Bounda 9 ry La Osa Water Service Area ~ Tucson Water Service Area Red Rock Water Service Area Low ~. Develo ment E ~~' ., P La Osa --. ~~a _ ,_ s~ ~' ~~ I ~i ' I 1 1 a. .. ..--~,„ .... ~ - w . -0. f _~ r~_ ..- ~, c_ ~-- F a- ._7 a ~~ 4~ ~. ~ ,_ i _ _ ~ ~ - _ a ._ :_ _._ -.r~.. ~~.~,~~. ~. ~ _ - - .. ~_ ~ ~~ .. r ,_ ~v ,~. j ~ r_ .~~ ~r ,.. ,. ¢.. -~ " ~ - - A ~. .~ ~;. ~ ~~ K._ ~ t` 1 ~_ .;, ~ ' ~. ~ ,.~ .; ; ~, .e . ~~ x~ ~~a~.~.~ n_,._:~..~- ~ -~ ..~,-.- \\ tea' ~ Tucson Water Buildout 7,079 AFY ~ .., ~. m~ ~. ~_ ' ~ S ~ 7 a ... y ~ '" r ..~. " ~.: ,, ~ ..._ ~ ~ .. _ ..$ ~ a . B a ~J,u.~~ ~ ^ ~+~ P .-. "~.._ '~ ~-Y -"fir"..a~:'4a- e . ¢~ '3s' ~~: a : ~..:d r ~ I 7} t F-~ _ c-ate.-. Y~g `°_i ..... _.. - .. < -- ~ 1 .; ~ ~ y _ . .. <. .,.. ate. t~ i ~-' d 4q ~ S °,„„-k. , ti': y ~` v ..,.z .,.a-.ii z '~ ~ ' j P ~ ' ~ ~ ~ Yj ~ s t ~::. t k - ~ f~ t ~ ~~ ~ma' ` ~ ~~ ~ -F I tti~~>~i Ana ~~~~~~:~~~~~~ i~~~ _ -}-r . Low Potential Development Area -_ Existin Marana Town Limits N 9 ~ Area outside Town Limits assume annexation N Feet 0 6,000 12,000 Water Demand Projections 2010 Marana Water Master Plan Exhibit ES-2 V 1V PR1Gr;l E r+ ~E: r^ZT ~Jri Legend - -=" A _ .' B ~_j C CR PR ~V W+ - X Y ,, ~y Z N ~ Feet 0 5,00010,000 Pressure Zones PR _.~ .. 2010 Marana Water Master Plan Westland Resources, Inc. Ergkkerinp ondFrni,mme~da+(bnwlfa~h Y1 Exhibit ES-3 ~ ~~ _ s ., ,a ~ _. £. y vii r ~ r~~S #' ~ ~y`+~ 'W ~ ~ .~ 3, _ # ~.~ ,u h., ~:'~~ r r _ . r ,' r'~J ~, s. ~ , . ' ..'. ,„ .~ _ F n+ a^ ~ ~ ~~f ; ~ „ ~ „ ~ - ~~~ t g ~ ,: ' ~~ "' - , fu.u a ' k ~ = e,. ~~ a. ~ , r ~ y. ~~~" >< .. ,. x : .. ~ . : . .~ _~ . ~~ .. r . ~~ ~~ ~,; ,; .:. ~~ . ~~ .,. .. ~~ ~_ . iay ~ , ~' ~- :~ ~~ vi ~ ~ ' ~~ ~ P~ ~ ~` .:w'F~ ., ~~ ~a ~~ - t~ ,a . ~o ~. ~ ~ ~t~~'~'~,C~ ~a~r~~ t3 wµ .~ c: -~ - ~ ~ ~ :~, ~ ~ ~~ m ~ ~ ~ ~ t ~ a ~ ~~~ ~~~ ~; ~ m ~ ~ Y ~ h ,,, yes ~ ~ :... ~ u> .. ~ ,, .E - -- ~, ~ ~, -, . . C X1d - B A ~ • . CHAPTER 1 -MASTER PLAN OVERVIEW 1.1 INTRODUCTION Town of Marana Water Department (Marana Water) provides water service primarily within the corporate limits of the Town of Marana (the Town). Currently, Marana Water serves approximately 13,000 people and has about 5,000 residential and commercial customer accounts. The Marana Water service area is expected to expand as the Town grows. Currently, Marana Water relies on groundwater for its potable water supply. Marana Water strives to seek additional renewable sources of supply such as Central Arizona Project (CAP) water and reclaimed water to achieve safe yield set forth by the Arizona Department of Water Resources (ADWR). The primary goals of the 2010 Potable Water System Master Plan are to evaluate the existing Marana Water potable water system, identify areas where the existing system need to be improved, and to project future demands and associated infrastructure requirements. The Master Plan is the key guidance document for Marana Water to identify the capital components required to functionally and adequately serve both its existing and fixture customers. It is essential to make a distinction between these two elements as it is the Town's policy that new growth/development pay for itself. This places the financial burden of growth-related water infrastructure on future customers. This Master Plan provides the planning and capital cost data required for Marana ~~later to re-evaluate its impact Fee rate structure projecting forward. Another goal of this Master Plan is to identify and define key policy issues and present a plan to effectively manage those issues. This goal will be accomplished by defining the key water system planning elements that are most important to Marana Water, evaluating the existing system for service and upgrade requirements, and planning the capacity and capability of the Marana Water infrastructure to provide appropriate service to the expanding service basis. The approach of this Master Plan is first to examine the current applicable regulatory environment and identify the regulatory constraints to which Marana Water must adhere. Based on the regulatory requirements, the Marana Water policies are presented. These policies include the definition of the water service area, the planning horizon envisioned in this Master Plan, the criteria used for infrastructure development, and the growth projections used to develop this planning document. Marana Water has implemented policies that meet or exceed the standard of service for potable water as required by federal, state, and local regulations. An extensive coordination effort with the Town of Marana Planning and Zoning Department allowed for the updating of existing land uses and population projections throughout the proposed Marana ~Ylater service area. Planning projections provided by the Town have been used to create a general picture of the Marana Water's infrastructure requirements over the next 5, 10 and 20 years, as well as at buildout. Using current and future system requirements, a comprehensive water system plan has been developed to define the capital improvements required for the water system at the 10-year planning horizon and at buildout. Cost opinions for the infrastructural improvements have also been developed and an unplementation plan for the construction of the improvements is provided. As with all planning documents, this document is intended to be a living document, i.e., a tool that is flexible and fluid and is subject to change as growth patterns and infrastructure requirements change. Updates to the Master Plan should be achieved frequently to accurately reflect the new planning constraints that Marana Water will face in the future. 1.2 KEY ISSUES The development of a Master Plan requires defining key issues and policies early in the planning process. These policies dictate the required water system layout, facility sizing, reliability, and costs of the required infrastructure. The existing policies have been continuously re-evaluated throughout development of this Master Plan by the Town. Infrastructural sizing and the associated costs (developed via comparisons with those of other local water companies of similar size/location/nature} were used in evaluating the future needs of Marana Water. ~aW~ ~ Town of Marana 2010 Potable Water System Master Plan $,f3112t~7D DRAFT ° ° a~rtaw ' ~utzcx+p CHAPTER 'I : MASTER PLAN OVERVIEW Page 1.2 1.3 WATER SYSTEM PLANNING HORIZON The planning horizons for this document are 5 years (2015), 10 years (2020), 20 years (2030), and ultimate buildout. The Master Plan will identify current conditions and water demand projections for the years 2015, 2020, 2030, and for projected buildout (as defined by the 2007 Town of Marana General Plan). These timeframes are consistent with the planning horizons defined by the Town's planning process. Potable water demand projections on a per-zone basis are provided for each of these horizons. These projections allow for the development of a capital improvement program and for the phasing of the funding, design and installation of the required infrastructure. 1.4 LIMITS OF WATER SERVICE AREA This Master Plan defines the Marana Water buildout service area based on the Town's 2007 General Plan, excluding La C1sa, areas to be served by Red Rock, Tucson Water, other water providers, and areas anticipated with low development potential. The buildout service area is flexible, and may vary in the future, as conditions require. Marana Water reserves first right of refusal for new service to all new development within its corporate boundaries. 1.5 WATER RESOURCES AND DEVELOPMENT Marana Water currendy relies solely on groundwater for its potable water. The system's existing well fields lie primarily within the Santa Cruz basin. The well field systems have historically provided ahigh- quality and reliable source of water. Marana Water has an Assured Water Supply (AWS) Designation with ADWR, and is a member of the Central Arizona Groundwater Replenishment District (CAGRD). public opinion, the Town and other surrounding communities have been cooperating to investigate additional renewable water supplies for the northwest area. Entities involved in this effort include the Town of Marana, Metropolitan Domestic Water Improvement District {MDWID), Flowing Wells Irrigation District, Town of Oro Valley, Pima County, City of Tucson, Bureau of Reclamation (BOR}, and Central Arizona Water Conservation District (CAWCD). One goal of this 2010 Master Plan is to provide a distribution system that has the flexibility to accept water from one or more treated potential renewable water sources as well as from its existing groundwater well system. This will provide Marana Water with the flexibility, with minor infrastructure adjustments, to accept source water from a multiple number of potentially acceptable alternative water resources. 1.6 WATER QUALITY REGULATIONS The Safe Drinking Water Act (SDWA) establishes miru.rnum water quality standards for health and aesthetic water quality considerations. The SDWA identifies enforceable maximum contaminant levels {MCLs) for health-related constituents and non- enforceable secondary maximum contaminant levels (SMCLs) for aesthetic-related constituents. The SMCLs are not federally enforceable. It is the policy of Marana Water to comply with and when practical exceed the requirements of SDWA far potable water. Marana Water regularly monitors the SDWA regulated constituents and is in compliance with the regulations. A summary of the regulatory requirements is identified in Chapter 2, Regulatory Requirements. To remain consistent with its Designation of AWS, Marana Water will ultimately be required to use sources other than groundwater to meet its replenislunent obligation. Marana Water currently has rights to 1,528 acre feet per year (AFY] of CAP water. Concerns have arisen regarding the continued mining of groundwater in the Town and greater Pima County area. These concerns include the long- term decrease of groundwater levels, resulting local subsidence, degradation of water quality, increased pumping costs, and the need to build new and deeper wells. For these reasons, as well as general 1.7 SYSTEM IMPROVEMENTS FOR EXISTING CUSTOMERS This Master Plan identifies improvements necessary to bring the Marana Water system to the levels of service defined by the applicable system-related policies. These improvements are related to meeting capacity-related needs as well as replacing aged and outdated facilities. The upgrades to the existing system are considered operational and replacement- based, and are funded by water service rate generated revenue. Town of Marana 2010 Potable Water System Master Plan 8/37/2010 DRAFT CHAPTER 1: MASTER PLAN OVERVIEW Page 1-3 1.8 SYSTEM IMPROVEMENTS FOR GROWTH This Master Plan identifies growth related unprovements needed for Marana Water to serve future customers based on the applicable system- related policies. The funding for improvements supporting growth is connection fee-based and is generally funded by future development. The projected budgets for growth-related facilities should remain flexible and evolve within each fiscal year to meet the constantly changing growth scenarios. 1.9 CAPITAL EXPENDITURES AND TIMING Capital improvement funding requirements are defined by the customers serviced by the project. Projects that improve the existing system are funded by rates. Projects that are to support future growth are funded by impact fees. The goal of the capital improvement program is to develop an environmentally sound and efficient water distribution system, and to create the greatest economic benefit to the existing and future customers of the water utility. This program must result in awell-planned and efficient water system that can be constructed in a properly timed and orderly fashion to meet the system's expanding needs. With the system development fee revenues available, l~iarana Water may sell bonds, or supply other financing, to provide the up-front capital required for constructing reservoirs, booster stations, wells, new source treatment and delivery, and major facilities. Project developers will continue to provide up-front capital to construct water system transmission main extensions to their property and, in some cases, provide additional capital for other water system improvements if funds from Marana Water are not available. many years may pass before the system development fees collected will pay the water utility in full for the front costs it has incurred. This requires that the cost of financing be included in the system development fee. A detailed analysis based on population and growth projections is required to balance the up-front capital Financing of projects and repayment obligations of the system development fees. If bond sales are used, it is important that the timing and amount of sales are scheduled to best assume that the projected connection fee and development fee revenues will be adequate to pay the debt service of the bond sold; all in a timely manner without the utilization of other funding resources. 2.I0 ANNEXATION POLICY Marana Water requires all commercial and industrial property, residential subdivisions, and single family residences within the Town of Marana General Plan planning area but outside of the established Town limits to be annexed into the Town prior to obtaining water service from Marana Water. To meet the requirements of the Marana Water design guidelines and Arizona Department of Environmental Quality {ADEQ} criteria, the facilities required to serve a new development project must be constructed and operational prior to connection. To address this issue, Marana Water has implemented impact fees that are paid at the time of meter hookup. Collected fees reimburse the costs for constructing wells, reservoirs, transmission mains, and booster stations that support new customers. This requires a large outlay of initial capital to build facilities before the first dollar of system development fees is collected by Marana Water. In addition, based on the projected buildout, Town of Marana 2a1 Q Potable 1Nater System Master Pian ____. 8/31!2010 DRAFT • • , CHAPTER 2 -REGULATORY REQUIREMENTS • • 2.1 FEDERAL REQUIREMENTS each July thereafter. As of July, 2010, Marana Water is in compliance with all these reporting 2.1.1 Safe Drinking Water Act (SDWA) requirements. The latest annual report is available online at the Marana Water website. The Environmental Protection Agency (EPA) has established regulations for water quality in potable water supply and distribution systems based on the requirements of the SDWA. The SDWA was signed into law in December 1974 and has been amended several times since it first became law. The SDWA requires that the EPA establish legally enforceable MCLs for a number of contaminants and continuously identify and set MCLs for additional contaminants. Currently, MCLs have been promulgated for inorganic chemicals such as arsenic, cyanide, lead, and copper; organic chemicals in the classifications of volatile organic chemicals, pesticides/herbicides/polychlorinated bi-phenyls (PCBs}, synthetic organic chemicals, treatment chemicals, and byproducts; radiological contaminants; turbidity (for surface waters and groundwater influenced by surface waters}; and microbiological contaminants. The EPA also established non-enforceable SMCLs relating to contaminants that may adversely affect the aesthetic quality of drinking water. The authority to enforce the MCL standards within Arizona has been delegated to the State of Arizona. Water quality programs are overseen by ADEQ. The following lists some of the rules most relevant to Marana Water under the SDWA: High nitrate levels have occurred in areas of the Marana Water service area mainly due to agricultural fertilizer runoff and/or septic system effluent seeping into the groundwater. The current MCL for nitrate is 10 parts per mullion (ppm}. All currently active Marana potable wells meet the Nitrate standard. In January 2001, the EPA adopted a new arsenic standard, reducing the drinking water standard Erom 50 parts per billion (ppb} to 10 ppb. Public water systems (PWS) were required to comply with the new standard in January 2006. As of July 2010, all Marana Water potable wells meet the new standard. Water suppliers are required to prepare annual water quality reports, termed Consumer Confidence Reports, for their customers. The first reports were due by Qctober 1999 and In November 2006, The EPA published the new Ground Water Rule (GWR) to provide fox increased protection against pathogens in PWSs that use ground water sources. The EPA is particularly concerned about ground water systems that are susceptible to fecal contamination. Community Water Systems (CWSs) that rely on groundwater supplies began complying by December 1, 2009. More details regarding the rule requirements and implementation are provided in Section 2.1.2. The EPA has developed a rule regarding levels of radon in drinking water. The rule includes MCLs and monitoring requirements for community water systems. Currently, the EPA/ADEQ does not regulate radon in drinking water. 2.1.2 Ground Water Rule (GWR) 2.1.2..1 Rule Requirements The requirements of the GWR include the following: Completion of regular sanitary surveys of PWS to look for significant deficiencies in key operational areas, Triggered source water monitoring when a system does not provide treatment that achieves at least 99.99 percent (4-log) inactivation or removal of viruses and identifies a positive sample during its Total Coliform Rule (I'CR) monitoring and assessment monitoring (at the option of the state) targeted at high-risk systems. Implementation of corrective actions by ground water systems with a significant deficiency or e~~idence of source water fecal contamination. Compliance monitoring for systems to ensure installed treatment technology reliably achieves at least 99.99 percent (4-log) inactivation or removal of viruses. `VW\ ~ Town of Marana 2010 Potable Water System Master Plan _ __ _ , w _.__ ...~..,.,~.,~...w,.... , .. , , w m-~.~.... __.w.. ~ ~ w~..... ,_,..r.. ~`3?I2~?10 DRAF ~ 4 ~a~y ia~ f ~aszcH~ CHAPTER 2: REGULATORY REQUIREMENTS page 2-2 2.1.2.2 Sanitary Survey The sanitary survey is a major component of the GWR The sanitary survey regulations have long been in place for surface water systems; however, the implementation of the GWR extends these regulations to include ground water systems. The sanitary survey is a review conducted by the State. This review looks at critical components of a public water system. The rule defines eight components that must be reviewed during a survey: • Source • Treatment • Distribution • Finished water storage • Pumps, pump facilities, and controls • Monitoring, reporting, and data verification • System management and operation Operator compliance with State requirements 2.1.2.3 Monitoring There are three main provisions to the monitoring regulations of the GWR. Triggered source water monitoring Assessment source water monitoring Regular compliance monitoring Source water monitoring will be required if a water system does not provide 4-log treatment and identifies a positive sample during its TCR monitoring. if a system receives notice of a total coliform-positive sample collected under the TCR, it must take a source water sample at every ground water source in use within 24 hours. There is an exception to the source water sample requitement if the State can determine the positive sample was due to a problem in the distribution system, not the source. Further, if any initial triggered source water sample is fecal indicator-positive, the system must collect an additional five repeat source water samples over the next 24 hours. It is at the State's discretion to require immediate corrective action to address contamination at those sites. The G~~1R also provides a provision for States to require systems that do not provide sufficient disinfection treatment to conduct assessment source water monitoring at any time and require systems to take corrective action. For those systems that already provide 4-log treatment to their drinking water, the rule requires regular compliance monitoring to ensure the installed treatment technology reliably achieves at least 4~log inactivation or removal of viruses. 2.L2.4 Corrective Action The corrective actions include: correcting all significant deficiencies (e.g. repairs to well pads and sanitary seals, control of cross-connections, etc.), providing an alternate source of water, eliminating the source of contamination, or provide treatment that reliably achieves at least 4-log treatment of viruses. 2.1.2.5 Implementation CWSs that rely on groundwater supplies have begun complying by December 1, 2009. As the State has control over the assessment monitoring, there are no national timeframes associated with this portion of the rule. The EPA requires States must complete their initial round of sanitary surveys by December 31, 2012 for most CW'Ss. States will have until December 31, 2014 to complete the initial sanitary survey for CWSs that are identified by the state as outstanding performers and non-community water systems. As of July, 2010, Marano Water is implementing the GWR by conducting triggered source monitoring if a total coliform-positive sample is indentified during the routine TCR monitoring. It is Marano Water's policy to retrofit its existing system as funding permits to provide 4-log treatment, and to require all its new sources to provide 4-log treatment. 2.1.3 Public Health Security and Bioterrorism Preparedness and Response Act The Public Health Security and Bioterrorism Preparedness and Response Act (PHSBPRA) of 2002 amended the SDWA to add a number of new requirements for community water systems regarding drinking water security and safety. The new section of the SDWA requires that water systems serving over 3,300 persons must conduct a vulnerability assessment to determine the susceptibility of the system to terrorist attack or other intentional acts intended to substantially disrupt the ability of the system to provide a safe and reliable supply of drinking water. A vulnerability assessment helps the water utility evaluate the ti '~^ of Town of Marano 2010 Potahle Water System Master Plan __ , 8131 f'20 t 0 DRAFT ~~~ '~ R770N* CHAPTER 2: REGULATdRY REQUIREMENTS Page 2-3 susceptibility of the water supply, storage, and distribution system, and its electronic or computer systems to possible threats and determine risks to the community based on potential threat scenarios. The assessment can help the water utility identify and prioritize corrective actions to reduce risk of loss and damage due to hostile acts. Corrective actions may include security upgrades, modifications to operational procedures, and policy changes to mitigate the identified vulnerabilities. A vulnerability assessment contains the following elements: description of the water system, identification and prioritization of adverse consequences to avoid, determination of critical system assets, assessment of the likelihood of malevolent acts, evaluation of existing response measures, analysis of current risk, and development of a prioritized plan for risk reduction. The PHSBPRA also requires that the community water system serving a population greater than 3,300 prepare or revise an emergency response plan that incorporates the results of the vulnerability assessment. This emergency response plan must identify procedures to be used in the event of an intentional attack on the water system. The plan has to be completed no later than six months after the completion of the vulnerability assessment. As of )uly, 2010. a vulnerability assessment and an emergenry response plan for Marana ~~later have been completed. Marana Water is currently in its implementation phase to conform to the PHSBPRA. 2.1.4 Occupational Safety and Health Administration (OSHA) The OSHA is a federal agency created to ensure safe and healthful workplaces. State and local government workers are excluded from federal coverage under the Occupational Safety and Health Act, but ate covered under the State of Arizona Workplace Safety and Health Program, which includes, by reference, the Federal Occupational Safety and Health Standards. The state program was developed in accordance with OSHA requirements and approved by the U.S. Department of Labor. This program includes compliance activities to ensure employers are complying with the Arizona Occupational Safety and Health Standards requirements. The requirements of the Arizona Division of Occupational Safety and Health (ADOSH) contain many subjects related to working conditions, including work surfaces such as ladders, exposure to hazardous materials, exposure to noise, and safety training. These requirements pertain to both Marana Water employees and personnel employed by contracting or consulting companies working at Marana Water sites. The state program also includes a Worker's Compensation Program that relates to medical benefits and compensation for job-related accidents, illnesses, and injuries. 2.2 STATE REQUIREMENTS Arizona Revised Statutes (ARS) Titles 45 and 49 were developed by the State of Arizona to deal with subjects relevant to the operation of a municipal water system. ARS Tide 45 describes the duties and programs of ADWR. ARS Title 49 describes water quality control, and is the primary regulation for potable water supplies. Title 49 designates the ADEQ as the agency responsible for ensuring the health and safety of public water supplies. The Arizona Administrative Code (AAC) consists of rules and regulations used to expand and define the provisions of the ARS. AAC Title 18 relates to environmental quality, and covers the subjects of safe drinking water, water quality standards, and operator certification. 2.2.1 Arizona Department of Environmental Quality {ADEQ} The Environmental Quality Act was established in 1986 for the purpose of describing the responsibilities of the ADEQ. Broad authorities were established for the management, control, and regulation of sources that may impact water quality. The ADEQ was required to adopt numerous standards for surface and groundwater quality, to define aquifer boundaries and to establish aquifer classification procedures. The ADEQ has provided a number of guidelines for the design of water systems to assist water suppliers in constructing water systems that provide safe, reliable water service. The Pima County Department of Environmental Quality (PCDEQ) currently has delegated authority over the Marana Water system for compliance with ADEQ regulations for new construction and sanitary surveys. The ADEQ administers local authority over the Marana Water system for testing and compliance with the EPA water quality standards. The following information has been summarized from the AAC Engineering ,MNa, Town of Marana 2010 Potable WVater System Master Plan -,_ , ______..WY,.w.~.-..~~.....~,..._... _ __ 8.~3~/2010 DRAFT ~', 1 R170µA CHAPTER 2: REGULATQRY REQUIREMENTS Paget-4 Bulletin No. 10 -Title 18 and various ADEQ guidance publications: provided using a private pressure reducing valve (PRA on the service side of the connection. 2.2.1.1 Drinking Water Quality Requirements The mission of the Arizona Safe Drinking Water Program is to ensure the delivery of safe drinking water to users of public water systems through regulatory oversight, technical assistance, and public education in facility planning, design, construction, operation, and compliance monitoring, and to preserve and protect drinking water sources. The Drinking Water Program is federally mandated to ensure safe drinking water supplies for the public. Arizona has primacy for this program and, therefore, enforces the federal regulations in addition to state requirements. The Wellhead Protection Program (WI-3P} is incorporated into the Drinking Water Program and involves the promotion of voluntary programs in communities aimed at protecting aquifers for drinking water use. 2.2..1.2 Pressure Requirements Pressure extremes in water systems result in a potential for contamination of the water being delivered by the system. Low pressures may allow contaminants to enter the water system. Marana Water has a backflow prevention program as defined below (in 2.2.1.4} to help prevent contaminants from entering the system. High water system pressures may cause ruptures or breaks. The normal working pressure in a distribution system should not be less than 35 pounds per square inch (psi) during peak hour flow conditions. The system shall be designed to maintain a minimum pressure of 20 psi at ground level at all points in the distribution system under all conditions of flow. This requirement is generally interpreted to mean that the minimum residual pressure must be 20 psi at each meter in a fire-flow event from any hydrant during a flow condition of peak day flow plus fire Flow. Maximum pressures of as much as 120 psi may be allowed in small, low-lying areas not subject to high flow rates and surge pressure, provided pressure- reducing equipment is installed. The International Plumbing Code (II'C) requires the water pressure within the individual property owner's plumbing below 80 psi. Increasing or regulating the pressure from the meter to the customer is the responsibility of the customer. Pressure reduction is generally 2.2.1.3 Regulatory Storage Requirements The minimum storage capacity for a community water system is required to be equal to the average daily demand during the peak month of the year. However, this requirement may be reduced by aquifer storage components when multiple wells are used to provide source water. Storage capacity may be based on existing consumption and phased in as the water system expands. Marana Water has adopted the storage requirement of a minimum of 1.S times annual average daily demand (ADD) plus fire-flow requirements. Storage should be provided in the zone where the usage is required or in a location where it may be readily transferred to the zone of use. Out of the overall storage requirement, 25 percent is recommended to be provided as gravity storage. The gravity storage will provide Marana Water with operational flexibility, system reliability, and potential operational cost reductions. 2.2.1.4 BackflowPrevention Requirements The AAC requires water suppliers protect the public water system from contamination caused by backflow through unprotected cross-connections by requiring the installation and periodic testing of backflow prevention assemblies. The law requires that a backflow preventer be installed whenever there is a possibility that cross-connections might occur or a foreign substance might enter the water system. Such substances include chemicals, chemical or biological process waters, and water from public water supplies that have deteriorated in sanitary quality. Backflow prevention assemblies must be tested annually, and the test records must be kept for a period of at least three years. In line with the AAC requirements, the Town of Marana Code describes the specific requirements of backflow prevention and cross-connection control for the Marana Water system. 2.2.1.5 Emergency Operating Plan (EOP) It is a requirement of the ADEQ that each community water system develops an EOP and keeps the plan in an easily accessible location. A water supply EOP is also required as part of the SDWA WHP program and under the PHSBPRA. The ADEQ has prepared a Drinking Water ~~wM1 G! ...own of Marana 2010~Potable Water S stem Nla._. ._..._.w_ ... _...., .... ~ . ..~.._.. star Plan ~ t ~~3?~'zG?(i L~RaFr y ~aa~ar~ ,:,:.. ~AI70^~~' CHAPTER 2: REGULATQRY REQUfREMENTS Emergency Operations Plan Checklist to provide specific guidance regarding information to be included in the emergency plan. This checklist has a specific requirement for utilities to identify how they will maintain the system without their largest supply source. The plan shall detail the steps that a water system will take to assure continuation of service in the following emergency situations: Loss of a water supply source. Loss of supply due to major component failure. Damage to power supply equipment or loss of power. Contamination of water in the distribution system as a result of backflow. Collapse of reservoirs, reservoir roofs, or pump-house structures. Breaks in transmission or distribution lines. Chemical or microbiological contamination of the water supply. The EOP should provide an overview of the water system {including system mapping), establish personnel duties, identify emergency contacts and notiEtcation procedures, and delineate emergency operating procedures. The EOP should also provide for alternate sources of water and identify critical system components and spare parts. The PI~SBPRA also requires that each community water system maintain an EOP that incorporates the results of the vulnerability assessment, as discussed in Section 2.1.3. Marana Water has developed an EOP and the EOP is being updated regularly to comply with the State's requirement. 2.2.1.6 Clean WaterAct-National Pollutant Discharge Ehm.tna tion System (NPDES) / Arizona Pollutant Discharge Elimination System (AZPDES) Page 2-5 now administers the program and issues permits through AZPDES. The AZPDES includes two types of permits: general permit and individual permit. The ADEQ issued an AZPDES General Permit on April 27, 2010 for De Minims discharges, including those associated with potable water systems. Activities covered under the General Permit include: Operation and maintenance flushing, well flushing, line break and post-repaix flushing, and discharges related to system pressure releases and overflows. Discharges are required to meet all standards applicable to the receiving water body. In general, the AZPDES permit (both general and individual permit} requires the use of Best Management Practices (BMPs) to ensure discharges of pollutants to the waters of United States are limited. 2.2.2 Arizona Department of Water Resources (A.DWR) The ADWR was created in 1980 to adiniiuster state water laws, except those relating to water quality. The ADWR also explores methods of augmenting water supplies to meet future demands and ~vorks to develop public policies to promote conservation and the equitable distribution of water. The ADWR oversees the use of groundwater resources under state jurisdiction and negotiates with external political entities to protect and augment Arizona's water supply. 2.2.2.1 Groundwater Managerrlent Code To address groundwater depletion in the 5tate's most populous areas, the State Legislature created the Groundwater Management Code in 1980 and directed the ADWR to implement it. The objectives of the Code are to control severe groundwater overdraft, provide the means for effectively allocating Arizona's groundwater resources, and augment Arizona's groundwater supply through water supply development. The Code contains six main provisions: The Clean Water Act (CWA) regulates discharges of The establishment of a program of groundwater pollutants residing in "process" water to waters of rights and permits. the United States (waters) through the NPDES permit program. The ADEQ has primary for the A provision allowing for no new agricultural NDPES permit program, i.e., the state government irrigation within the five (S) Active Management Areas {AMAs). ~6'~' ~ ~~ Town of Marana 2490 Po#able Water System piaster Pian ~- --- , ,i 8f31/2d10 DRAFT ~R170ti~ CHAPTER 2: REGULATORY REQUIREMENTS Page 2-6 The preparation of five water management plans, one for each AMA. The development of a program that requires demonstration of an Assured Water Supply (AWS) for new growth. A requirement to meter/measure water pumped from all non-exempt wells. A program for annual water withdrawal and use reporting. Z.Z.Z.Z Active Management Areas Areas where groundwater depletion is most severe are designated as AMAs and are subject to regulation. There are five designated AMAs in Arizona, including the Tucson AMA and the Pinal AMA. The existing and majority of the projected Marana Water service areas at buildout are within the Tucson AMA. The balance of the anticipated Marana Water service areas are within the Pinal AMA. The Tucson t~q has a statutory goal of achieving safe-yield by 2025. Safe-yield means that the amount of groundwater pumped from the AMA. on an average annual basis does not exceed the amount that is naturally or artificially recharged. The safe-yield goal is a basin-wide balance. Water level declines in one portion of the AMA can be offset by recharging water ui another part of the AMA. The Groundwater Code directs the ADWR to develop and implement water conservation requirements for agricultural, municipal, and industrial water users. The ADWR develops and updates management plans for each AMA. The management plans reflect the evolution of the Groundwater Code, moving Arizona toward its long-term water management goals. The management plans establish conservation requirements for municipal, agricultural, and industrial water users. In each successive manage- ment plan, water conservation and management requirements are expected to become increasingly stringent. The Tucson AMA is currently operating under the Third Management Plan and is developing its Fourth Management Plan. 2.Z.Z.3 Conservation Requirements The ADWR develops conservation requirements with assistance from water users in the AMAs. Municipal water consen~ation requirements apply to water providers, cities, towns, private water companies, and irrigation districts that provide water far nan-irrigation uses. The goal of the municipal conservation program in all AMAs is to promote efficient water use. Marana Water is currently enrolled and regulated under the Modified Non-Per Capita Conservation Program (MI~IPCCP} established in the Tucson AMA's Third Management Plan. Based on the total number of residential and non-residential service connections in the distribution system, Marana Water is regulated as a tier II municipal provider and is required to implement a public education program and five additional water conservation measures including providing new homeowners with low water use landscape information, implementing residential interior retrofit programs, customer high water use inquiry resolution, customer high water use notification, and developing industry partnerships on water conservation. The Tucson AMA Third Management Plan and other conservation-related state programs also cover a number of other requirements that are intended to promote water conservation, including: Along new publicly owned medians or roadside areas served by municipal providers, groundwater may only be used for watering specific low-water-use plants. The ADWR maintains a list of approved low-water-use plants. The Third Management Plan restricts water use at turf facilities larger than 10 acres in size, such as golf courses, schools, parks, cemeteries, and common areas of homeowners' associations. The amount of water that turf facilities can use on an annual basis is specified by a formula in the plans. The municipal restrictions for turf facilities are the same as those that apply to industrial facilities. The Third Management Plan contains restrictions on the use of groundwater in artificial lakes. A 1987 State Law (the "Lakes" bill) restricts the use of groundwater to create/maintain lakes, ponds, and swirnnvng pools within AMAs. In general, new lakes in AMAs cannot be larger than 12,320 square feet `WY OJ Town of Marana 2010 Potable Water System Master Plan --_ _ _ , ,,.~,.-,.w..... W._ a ..............m..,... , ~,~.~..mm _...~ .,M ~ ,_w ..m. . ... ,_ . _ _. - -- - 4 ~a~r~~~a 8/31/2090 DRAFT ~~~ r- ~RI7CNi CHAPTER 2: REGULATORY REQUIREMENTS Page 2-7 unless certain exemptions apply. For example, the lakes may be filled with effluent. However, special permits are available from the ADWR that allow new lakes to be filled with poor quality groundwater or other water sources on an interim or emergency basis. Lakes built before January 1, 1987, and lakes located in certain public facilities, such as parks, can continue to use groundwater. Golf course lakes are also exempt from the law because they are regulated by specific provisions within the management plans. Private residential swirnrning pools cannot be larger than Olympic size (12,320 SF). Resorts, motels, and country clubs can have several pools, but only one pool can be larger than Olympic size, but not larger than 1 acre in size. Each large municipal water provider must maintain its distribution system and properly meter and account for all deliveries. Water lasses map not exceed 10 percent. Small providers must maintain their systems such that losses do not exceed 15 percent. 2.2.2.4 Assured Water Supply The Groundwater Code established requirements to ensure that water supplies are adequate to meet the long-term needs of new development. The AWS Program requires the demonstration that sufficient water supplies of adequate quality are physically, continuously, and legally available for 100 years. In an AMA, anyone who offers subdivided or non- subdivided land for sale or lease must demonstrate an assured supply of water to the ADWR before the land may be marketed to the public. To receive an AWS certificate from the ADWR, a developer must demonstrate that: 1) water of sufficient quantity and quality is available to sustain the proposed develop- ment for 1Q0 years, 2) the proposed use is consistent with the management plan and the AMA management goal, and 3) the water provider has the financial capability to construct water delivery and treatment systems to serve the proposed development. Alternatively, the developer can locate the proposed development within the service area of a city, town, or private water company that has already received a Designation of Assured Water Supply from the ADWR. If a "designated" provider serves the subdivision, the developer only need obtain a written commitment of service from the water provider. In 1995, the ADWR adopted new AWS rules, primarily to support the groundwater management goals. New rules associated with this program promote the use of renewable supplies, such as effluent and water delivered via the CAP, as a component of an assured supply. The rules require new developments to be based predominantly on renewable supplies. In 1993, the Arizona legislature formally created CAGRD to provide a way for developers and water providers to demonstrate an AWS and help the state meet the objectives of the 1980 Groundwater Management Act by replenishing pumped groundwater. The CAGRD recharges groundwater supplies on behalf of its members in order to reach and maintain "safe yield" in the Tucson AMA. Martina Water is a member of the CAGRD. The CAGRD is managed by the CAP, which in fain is managed and operated by the Central Arizona Water Conservation District (CAWCD). The CAV~jCD is a municipal corporation, also known as a public improvement district. This quasi- governmental entity was formed to repay the federal government for the reimbursable costs of construction, and to operate and manage the CAP. The CAGRD currently replenishes excess CAP water for members to meet their replenishment obligations. 2.2.2.5 Groundwater Rights .u~ AMAs A vital part of groundwater management involves identifying existing water rights and providing ways for water users to initiate new withdrawals. Within an AMA, an entity must have a groundwater right or pemnit to pump groundwater legally, unless the entity is withdrawing groundwater from an exempt well (maximum pump capacity of 35 gpm). Exempt wells may be used to withdraw groundwater only for non-irrigation purposes, and are generally used for domestic and landscape purposes. Exempt wells must be registered with the ADWR, but they are subject to fewer requirements than non-exempt wells within AMAs. In order to withdraw water from non-exempt wells in AMAs, either grandfathered rights, service area rights, or a withdrawal permit must east for the well. t~ ~ ^ C'F Town of Martina 2Q7 0 Pcatable Water System Master Plan _. 9 -'" ~a~A 7 w . _ __ __ 8/31/2010 DRAFT ~°~~ ~ArzaN~ CHAPTER 2: REGULATORY REQUIREMENTS Page 2-8 Users who pump groundwater from non-exempt wells in AMAs must also report annual pumpage to the ADWR. This provision helps the ADWR determine how much water is being used and where it is being used. The Code also requires payment of an annual groundwater withdrawal fee. Revenues from the groundwater withdrawal fees are used for administration and enforcement purposes and for funding augmentation and conservation assistance programs. Withdrawal fees can also be used for the purchase and retirement of grandfathered rights. water utility, and describes the conditions that must be met to allow new construction, the agreements required for new construction or line extensions, and the method for review and approval for construction of facilities by entities other than the Town. The Water Code also includes the water system capacity requirements, oversizing refunds, and service area inclusion and fees. 2.3 LOCAL REQUIREMENTS The Town of Marano is governed by an elected Mayor and Council, which have jurisdiction over rates, fees, and water management issues. The Mayor and Council are advised regarding water utility issues by the Utilities Citizen Advisory Commission, based on the requirements and guidance set forth in the Town's Water Policies and Water Utility Code. The function of the Utilities Citizen Advisory Commission is to act as an advisory committee for the Town Council on capital improvement program planning and rate structure formulation. The Commission reviews and makes recommendations on water system development, long-term water sources, capital needs, rate adjustrnents, capital budget and allocations, state and fedexal legislation regarding water-related issues, expansion of utility service areas, and private water company acquisition. 2.3.1 Town of Marano Water Policies The Town of Marano Mayor and Council have developed water policies to provide guidance regarding the operations and finances of the utility. The Town's water policies, presented in the next chapter, discuss requirements for financing of the water utility, including setting water rates and other fees, system development requirements, acquisition of other water systems, water supply, management and development, and conservation. 2.3.2 Town of Marano Water Code The purpose of the Water Code is to promote the health, safety, order, and general welfare of those persons served by Marano Water. The Water Code sets guidelines for providing water service to the residents of Marano and those served by Marano ~~Vater but outside the Town boundaries. The Water Code provides the basis for the operations of the t ,~^+ a Town of Marano 201 ~ Potable Water System Master Plan , e-~ _-_ , _. ~~ 4R1ID''~ti j • =.t~~. CHAPTER 3 -WATER SYSTEM DEVELOPMENT POLICIES ~~ ~ Based on the regulatory requirements in Chapter 2, the Town of Marana has developed ordinances and policies relating specifically to the operation of its water utility. This section presents a summary of the policies for service set by the Town of Marana. 3.1 NON-POTABLE WATER SYSTEM POLICY The goal of the Water Master Plan is to provide the flexibility within the water system infrastructure to adapt to the varying conditions that will occur when irrigation demands are removed from the potable water system. It is the goal of Marana Water to serve the majority of the service area's irrigation and turF demands via either a separate reclaimed or a non-potable water distribution system. The potable water system will continue to serve the existing and future large irrigation users until the non-potable water system is in place and operational. The potable water system will be designed to operate both reliably during the period it is serving the large turf users and efficiently, following their removal. The potable water system may be used as a backup for serving the non- potable users in case of temporary non-potable water system outages. This condition may be accommodated by the existing well system in the winter months. The wells, booster stations, and reservoirs will be designed, constructed, and phased into the system to eliminate major operational changes during the conversion of the large turf users to alternative water supplies, and to avoid large redundant facilities after the large turf users are removed from the system. 3.2 FIRE FLOW POLICY The Town of Marana is currently served by the Northwest Fire District, and has adopted the 2006 International Fire Code (IFC). The 2006 IFC includes tables and formulas for calculating the required fire flow for residential and commercial facilities. The fire-flow requirements Eor residential facilities are typically based on the development density, the square footage of the homes, and whether or not the structures are sprinklered. Fire- flow requirements for homes typically range from 750 gpm to 1,500 gpm, depending on the above conditions. The typical residential subdivision has a fire-flow requirement of 1,000 gpm for two-hour duration for units having a buildable area of less than 3,600 square feet. Other requirements include fire hydrants with a maximum spacing of 250 feet between residential structures and the nearest fire hydrant. Commercial facility fire-flow requirements also vary depending on the square footage of the commercial building, occupancy type, building material type, exposure distance to other buildings, and whether or not the structure is sprinklered. Typical commercial facilities within the Town of Marana area have fire-flow requirements from 1,500 to 4,000 gpm for atwo- to four-hour duration. The Fire hydrant spacing is generally the same as for residential structures. The Marana Water service area includes a number of older subdivisions, which were developed prior to the adoption/enforcement of the IFC. These areas do not have the currently required fire-flow capacity. Per the IFC, these areas are grandfathered and not required to be retrofitted to meet the IFC standards. The lack of fire-flow capacity varies greatly in these older areas. Some areas are served by 4-inch mains with little fire-flaw capacity. Other areas have larger mains and existing Fire hydrants but may lack booster and storage capacity to meet the fire flow and duration requirement. There are generally two considerations to providing adequate fire flow to a neighborhood. The first consideration includes offsite requirements; such as the volume of fire flow storage available in the reservoirs, adequately designed pressure zones, and the size of offsite transmission mains. The second factor involves the internal distribution system within the neighborhood, including main sizes, adequate looping, and fire hydrant placement. It is the goal of Marana Water to develop adequately sized reservoirs, properly designed pressure zones, and main sizing to provide adequate fire flow throughout the major water transmission mains within its water system. The required infrastructure for the interior subdivisions, including replacement mains, pavement replacement, looped systems, and new fire hydrants, may be developed and financed through miscellaneous capital improvements, system upgrades, or local neighborhood improvement districts. The existing Marana Water's procedures for plan review call for all subdivision and water extension plans to be reviewed and approved by the Northwest Fire District fire marshal. The fire marshal typically reviews fire hydrant locations, ~pW M1 C! Town of Marana 2010 Potable Water System Master Plan , ~ .-____ , 6~3?/2C~?~JP~,rT _. _.._.... , m_ . , ..w...... ~....,.,,.. m~...~~..~ .... ......... q h, a ~~a~ J ,i . ~~,~oN.. CHAPTER 3: WATER SYSTEM DEVELOPMENT PQLICIES Page 3-2 spacing, and fire-flow capacity requirements. The fire marshal also reviews street layouts, adequate access for fire trucks, and turnaround capacities for the trucks. The design engineer of the water project is required to provide design calculations and improvement plans for the facilities needed to provide the required Fire flow to the development. Marano Water also requires hydraulic modeling to be performed for the integration into the Marana Water system. These plans are then reviewed and approved by Marana ~Y/ater prior to construction. The design and development of this Master Plan include projecting fire-flow requirements within prescribed areas based on the land use zoning. These fire-flow projections are incorporated into each zone of the water system for infrastructure sizing and design. For the purpose of this Master Plan, the fire-flow requirement is generally assumed to be 2,000 gpm for two-hour duration for a pressure zone. However, when the existing fire flow requirement in a particular zone has exceeded this assumption, the larger existing flow requirement is then applied. 3.3 STORAGE CAPACITY POLICY Reservoir storage capacity is a critical element in the design and operation of water systems. Reservoir storage is used primarily to accommodate hourly fluctuations and demand, PDD fluctuations, fire- flow requirements, and emergency reserve storage. Each of these requirements added together forms the required storage capacity for each zone. Current ADF.Q criteria typically require the m;nirnum storage capacity per zone to equal the average day demand of the peak month. Under certain circumstances, in service areas with excess well capacities, the storage capacity may be lowered. The advantages of having additional storage include operational flexibility, reduced cycling time for production facilities, lower pressure fluctuations, greater reliability, and reduction in well capacity requirements for larger reservoir storage volumes. The disadvantages of a larger storage capacity requirement are the additional cost and aesthetic impacts of larger reservoirs, additional land area required for reservoir sites, and the increased potential to water stagnation in larger reservoirs. The selected storage capacity requirement for Marana Water is 1.5 tunes the ADD plus fire-flow requirements. This volume of water will provide for Town of Marana 2(?~i 4 Potable V1later S~stern Master Plan 8/39/2010 DRAFT hourly system fluctuations, emergency storage and fire-flow reserves. This storage criterion is based on maintaining a well system capable of providing peak-day demand for the system with the largest well out of service. Marana water recommends the storage reservoir be assumed at 60 percent full when performing hydraulic modeling for fire-flow availability. It is the policy of Marana Water to use gravity storage for each zone wherever possible. A gravity storage system provides a highly reliable water delivery system that operates with small pressure fluctuations and will also continue to operate during power outages using the remaining water in the reservoir system. When it is not economically feasible to provide a zone's full storage capacity via gravity storage, it is recommended at least 25 percent of the capacity be provided via gravity storage. The exceptions to these design criteria may be those isolated zones in the upper portions of the service area where reservoir locations are not available. 3.4 SYSTEM PRESSURE POLICY The design criteria for Marana Water include zone boundaries located at approximate 100-foot elevation intervals. The zone boundaries of the Marana ~Y/ater system are generally matched to the Tucson Water zone boundaries. For the purposes of this Master Plan, Marana Water will adopt the Tucson Water zone boundary delineations and high-water elevations for its pressure zones, with the exception of the W+ Zone, and the Continental Reserve/Picture Rocks service area, where the existing pressure zone delineation will be maintained as is. Using these design criteria, typical static pressure fluctuations within the system will vary from approximately 40 psi at the top of the zone to 87 psi at the bottom of the zone. The point of use pressures will vary from static with daily demand fluctuations and fire-flow conditions. It is the policy of Marana Water that its system be designed to maintain a residual pressure of at least 20 psi in all portions of the system under all conditions of flow, and a pressure of at least 35 psi during PDD. These pressures and zone boundary elevations are based on the finished floor elevations of the homes or the elevation of the highest floor of a multi-level building. In areas with steep terrain or where highly CHAPTER 3: WATER SYSTEM DEVELOPMENT POLICIES Page 3-3 variable elevations occur, zone boundaries may be allowed to be spaced at larger intervals than 100- foot and the static water pressures may be allowed to approach 120 psi if needed for effective operation. In these cases, Marana Water requires appropriate pressure-reducing facilities be installed to protect its infrastructure and individual services. The IPC requires the water pressure within the individual property owner's plumbing below 80 psi. All pressures above 80 psi within the water delivery system shall be reduced by individual PRV located on the provide side of the building service. Pressure fluctuations in the water system are highly dependent on the design of a water system. Two methods are typically used for system design and control. The preferred method is a gravity storage system with the watez surface of the reservoir set at the high water elevation of the system. This allows customers within the zone boundary to be served directly from the reservoir by gravity and the system pressure is thus regulated by the reservoir level. This method provides a highly reliable system with small pressure fluctuations. The pressure fluctuations under static conditions may be as little as 5 psi. The system will also continue to operate during power outages using the remaining water in the reservoir system. The second method of system control is based on pressure. Under these conditions, the operation of pumps is controlled by the pressure within the water system. Pumps turn on and off based on prescribed pressure ranges. This method of control vnll typically allow pressure ranges in the system to vary by as much as 20 psi throughout the day. In addition to greater pressure fluctuations, unless backup generators are provided, the water service will be disrupted during power outages. The above pressure fluctuations are required to be incorporated into the design criteria for designing of the zone boundaries, booster stations, and reservoir systems. Marana Water currently utilizes both methods of control, with backup generators provided at many booster stations. connections and to provide a looped system for internal distribution. In addition, appropriate valving at the recommended locations and intervals is required to isolate smaller sections of main during breakages and to reduce the number of residences out of service. 3.6 BACKUP GENERATOR POLICY Marana Water typically incorporates onsite backup generators at its large booster stations that provide pressure service to areas not canriected to a gravity storage system. It is also the policy of I~larana Water to make provisions for the connection to portable backup generators for those booster stations without onsite backup generators. Marana Water currently has theee onsite backup generators installed at the Marana Park booster station {400 Kilowatts {KW)), San Lucas booster station (275 KW), and the Continental Reserve booster station (400 KW). Marana Water also has a 35 KW portable generator stored at the Marana Operations Center. 3.7 SCADA POLICv Marana Water has a fully integrated supervisory control and data acquisition (SCADA) system. The system provides radio communication by Remote Terminal Units (BTUs) between all of the water facilities and a central control station at the water utility office via spread spectrum radio communication technology. The telemetry system allows an operator to remotely monitor and control water system operations. In addition, the system offers the ability to detect and analyze overall system trends over time. The telemetry-control system monitors water level elevations of reservoirs, water pressures, air levels, pump on/off conditions, and system failures. In the event of a failure, the RTU automatically alerts water utility personnel of the failure, allowing operators to take corrective actions prior to the disruption of customer service. The SCADA system also provides site security monitoring features for early intrusion detection. It is the policy of Marana Water to continuously maintain and upgrade its automated telemetry controls system. 3.5 LOOPED WATER SYSTEMS POLICY Marana Water requires looped water transmission and distribution mains for its water main grid system and individual development whenever practical. Review criteria include requiring developments to stub to property lines for future 3,8 WATER QUALITY CONTROL POLICY It is the policy of Marana Water to provide for system disinfection via wellhead chlorinatian and maintain adequate residual chlorine concentrations throughout the water system. Wellhead chlorination protects the water system from passive aixborne and 1, ~, ,~, Town of Marana 2010 Potable Water System Master Plan _ , ; ~~ , _. __._a~ ._. __ ~J3tfL010 UR~IFT' _ 9 ~;r ~rn~ CHAPTER 3: WATER SYSTEM DEVELOPMENT POLICIES Page 3-a bacteriological contamination. This policy will help prevent bacteriological contamination that may occur through airborne contamination at reservoirs or within stagnant mains. In light to the GWR requirements, it is the policy of Marana Water to provide 4-log virus treatment for new potable wells. This typically means a well- reservoir-booster station system is required to provide adequate contact time for disinfection. For the purpose of 4-log treatment demonstration, a chlorine residual of 0.5 ppm prior to the first customer is recommended. 3.9 VALVE AND PUMP FACILITY MAINTENANCE POLICY It is the policy of Marana ~Xlater to develop and implement a preventive, routine maintenance program to provide regularly scheduled maintenance on control valves, pumping units, motors, and other critical components of the water distribution system. Marana Water strives to exercise valves, inspects reservoirs, hydropneumatic tanks and boosters and fire pumps on a regular basis, Marana Water, it is recommended that all appropriate Town departments be made aware of the future land regiurements of the utility. This mechanism will alert Town staff and the development community early in the planning process that water utility facilities are required in a specified location. Through this process, site acquisition, concept planning and layouts, and water facilities design can be planned along with the surrounding development. Land acquisition for water facilities should be included in planning review checklists and pre-application meetings fox upcoming plan reviews. It is recommended that property dedications and acquisitions far potential water plant sites be made part of the rezoning and platting process for new developments. It is also essential for Marana Water to locate and acquire land for future well sites, boosters, reservoirs, treatment facilities, and existing facility expansions prior to facility design/development. This will allow the water utility to secure property ~vhen available and help in informing surrounding landowners of the future uses. 3.10 LAND ACQUISITION POLICY The Marana Water Master Plan provides locations and sizes for future wells, reservoirs, booster stations, future treatment facilities, and major transmission mains for the 10-year planning horizon. This Master Plan also identifies the sizes and locations of major gravity storage facilities and transmission mains at buildout. These facilities will be generally located on the water system maps. Many factors and constraints are required to determine the ELnal location for each site. These factors include the proximity to existing water transmission mains, proxirniry to three-phase power, access to public streets, specific elevation requirements for gravity reservoirs, hydrogeologic requirements for well sites, noise and buffer requirements for booster stations and wells, aesthetic screening requirements for aboveground facilities, and the cost of acquiring the land and/or availability of other preferable sites. Experience has demonstrated that the early identification of land and right-of--way needs for future use can result in substantial acquisition savings when compared to "urgent need" acquisitions. To minimize land acquisition costs for 3.11 EXISTING SYSTEM UPGRADE POLICY The Marana Watex Master Plan evaluates the existing water system an terms of engineering design criteria, to guide the utility in determuiing required upgrades to existing water facilities. The system design criteria include demand calculations, peaking factors, water supply requirements, the number and capacity of required wells, reservoir storage requirements, booster station capacity requirements, emergency backup systems, distribution system sizing, and water system grid requirements. An evaluation of the existing system was performed during the initial stages of the Master Plan planning process. The Master Plan identifies areas where the existing system does not meet the proposed standard of service as adopted by Marana Water. It specifies new facilities and/or facility upgrades to bring the existing system into compliance with design criteria. These facilities include new wells, booster station upgrades, reservoir capacity additions, transmission main augmentations, and pipeline replacement. The projected cost estimates are provided For these facilities, as well as a priority schedule and timeline for the infrastructure development. It is anticipated that the cost of upgrading the existing system will 1~~N J'f Town of Marana 201 Q Potable Water System Master Plan _ ~.~.~,~. r..,__..._. $l3 ~!2~ 1 ~ DRAFT q ~~,a~~,aNa , ~RJJ()F`~ CHAPTER 3: WATER SYSTEM DEVELOPMENT POLICIES Page 3-5 be financed by water utility rates. The system upgrades are limited to the existing water facilities and the spine water distribution mains, and not include projects to upsize mains within individual developments. 3.12 QVERSIZED REFUND AND CREDIT POLICY The Marana Water Master Plan includes the locations of the major water facilities and major water distribution mains. The major water distribution mains are generally located within the rights-of--way of major streets within the Town. The water mains are sized to deliver adequate flows to meet PDD plus fire Flow, or PHD, whichever is greater. These water main sizes are generally larger than required to serve a single development. During the extension of water main facilities to serve a development, it is preferable to initially construct the ultimate size water main rather than building smaller mains and later constructing additional parallel mains for future developments. Phasing the development of distribution system, calling for parallel mains, is typically uneconomical and many tunes becomes impossible before the second phase can be constructed due to restrictions and availability of existing right-of--way corridors. It is, therefore, the policy of Marana ~~later to build the ultimate water main facilities initially for water main extensions. The Town of Marana Code has an existing oversizing refund policy whereby the initial development installs the ultimate-sized water main at their cost. The Town will refund the oversizing cost of the water main by reimbursing the developer for the material cost difference between what was required to deliver water to the subject property and what was required to enhance the water system for future growth, in accordance with provisions identified in the water service agreement.. The oversized refunding credit policy will typically be used for water distribution and transmission mains only. 3.13 WATER SYSTEM DEVELOPMENT AND FINANCING POLICY Water system development procedures and system financing are the most critical and important policies to be addressed during updating of the Water Master Plan. The water system development requirements have been divided into two primary components: 1} the existing system upgrade requirements, and 2} water system improvements for growth and expansion. 3.13.1 Existing System Upgrades The first category of water system improvements defined by the Master Plan includes the specific facility requirements to bring the existing water system into compliance with the adopted water system design criteria, policies, etc. These projects have been identified, and opinions of probable cost (present value} have been provided. The policy of Marana Water is to develop a schedule for implementation and construction of the upgrades. Improvements may require financing through long- term debt and payback through the water rates. Required facilities include upgrades to existing storage and transmission mains. The required facilities are expected to have a useful life of 20 years or greater, but will require high initial cash outflows in the early years. Since these facilities primarily benefit the existing rate users, long-term debt may provide a mechanism for obtaining the initial cash flow requirements and spreading the payments over a longer term. This method of financing more closely matches the facilities' useful life and provides the ability to pay off the financing through water rates. 3.13.2 Water System Improvements for Growth and Expansion The second category of water system improvements includes water system expansion for system growth and water system service area expansion. The policy of Marana Water is that future growth pay for itself. All costs of the new facilities, which are required fox new system development, will be paid for by the future developments beneftted. Two methods may be used to allocate these costs to the development community. The first will be through water system development fees. Water system development fees will be assessed to smaller developments, based upon meter sizes, water demand requirements, or alternative methods. The water system development fee will include all costs associated with providing the facilities for serving the new development. These costs will include design and construction costs for the required reservoirs, booster stations, production wells, transmission mains, AWS, administrative, financing, *~~. Town of Marana 2010 Potable V1later stem Master P#an ___. , ,," 8/31/200 DRAFT 9 ~`~ '~~~~' ~~~~K~ CHAPTER 3: WATER SYSTEM DEVELOPMENT POLICIES Pa a 3-6 and other costs associated with inflationary cost escalations. The second method of fair share cost allocation to the development community will be through development and water service agreements. Marano Water will individually evaluate the larger developments to determine the appropriate size, location, and phasing requirements for future development on an individual basis. 3.14 PROJECT PRIORITIZATION POLICY Project priorities should be established based on meeting system design requirements and providing the greatest return of system development fees. Priority and project approval guidelines are used in developing the Capital Improvement Plan (CIP) for growth-related projects. Project priorities are established based on the following requirements (listed in no specific order}: 1. Ability to provide required peak demand, pressure, fire flow, and system reliability for largest projected population growth or commercial area. 2. Existing system's ability to meet ADEQ and Marano Water's requirements. 3. Greatest return of development fees to pay capital and Financing costs. 4. Ability of project to improve service to other users in the system. 5. Ability of Marano Water to pay for projects with funds on hand. 6. Ability to construct transmission mains as a part of an existing roadway project at costs significantly lower than future construction costs. The Master Plan projects should be integrated into major street and route roadway projects. 7. Ability of the project to enhance commercial growth within the Town. 3.15 WATER UTILITY CONSTRUCTION STANDARDS POLICY Marano Water has developed a set of construction standards relating to specific details of construction of elements of the water system. These standards are required to be implemented on all construction projects for Marano Water and exceed the mi„imum standards as required by ADEQ. Details are provided for a variety of construction elements, including backflow prevention, air release valves, meter boxes, PRVs, and drainage structure crossings. The standards also include design and Construction general notes. 3.17 DROUGHT PREPAREDNESS PLAN Marano Water has filed a Drought Preparedness Plan with ADWR in response to the potential impacts of a prolonged drought, if occurred, on its potable water supplies. The Drought Preparedness Plan defines four stages of drought responses from moderate to severe, which in turn determine the measures to be initiated to conserve the Marano Water's potable water supply. The four stages of drought and associated measures are defined as below: Stage One (Moderate) is initiated when any two of the triggers are present. (i) Arizona Drought Monitor percent of precipitation for the water year is 70% to 90% of normal. (ii) Arizona Drought Monitor is D-2: severe drought. (iu~} The annual decline of the overall groundwater level is between 1.0 feet to 2.4 feet. (iv) over 45 consecutive days of 100 Fahrenheit degrees. In Stage One, Marano Water will increase customer awareness about the drought and water resources through education. Additionally, the Town of Marano will work with Pima County to put in place ordinances that strengthen Southern Arizona's conservation ethic. Marano Water will work with its neighboring water providers to look at cooperative efforts that include providing emergency backup as well as joint conservation efforts. Most importantly, Marano Water will continue its overall water management efforts to use renewable water supplies. In effect, Marano Water has already been doing all of Stage One measures for last few years. Stage Two (Abnormally Dry) is initiated when any two of the triggers are present. (i~} Arizona Drought Monitor percent of precipitation for the water year is 50% to 70% of normal. (ii) Arizona Drought Monitor is D-3: extreme drought. (iii) The annual decline of the overall groundwater level is between 2.5 feet to 3.9 feet. (iv) Over 60 consecutive days of 100 degrees. In Stage Two, Marano Water requests \OWN OF Town of Marano 2014 Potable Water System Master Plan ~i31/2010 DRAFT ~.~ ~kitONA CHAPTER 3: WATER SYSTEM DEVELOPMENT POLICIES Page 3-7 customers to limit landscape irrigation to two days per week and only between 8:00 p.m. and 8:00 a.m., as well as avoiding other outdoor water uses such as hosing down walkways and washing vehicles without a bucket and hose with a positive cutoff nozzle. Hotels and restaurants will be asked to initiate industry green measures for conserving water, such as providing water only on request and washing sheets and towels only if requested. Under Stage Two, all of the measures of Stage One will also continue. Stage Three (Emergency} is initiated when any two of the triggers are present: (i} Arizona Drought Monitor percent of precipitation for the water year is 25% to 50% of normal. {ii} Arizona Drought Monitor is D-4: exceptional. (iii) The annual decline of the overall groundwater level 1s between 4.0 feet to 4.9 feet. {iv) over 75 consecutive days of 100 Fahrenheit degrees. In Stage Three, Marano Water will not permit the use of potable water for construction including dust control; reclaimed water will need to be used instead. Marano Water will consider instituting a drought surcharge to Tier 5 of its rate structure. Additional voluntary water reduction measures will be requested from customers including the limiting of landscape irrigation to one day per week and only between 8:00 p.m. and 8:00 a.m. In addition to avoiding outdoor water uses, customers will be asked not to empty or fill their pools. The other measures of Stage One and Stage Two will continue to be in place. Stage Four (Crisis) is initiated when any two of the triggers are present: {i} Arizona Drought Monitor percent of precipitation for the water year is 25% of normal. (ii) Arizona Drought Monitor is D-4: exceptional. (iii) The annual decline of the overall groundwater level is 5.0 feet or more. (iv) over 90 consecutive days of 100 Fahrenheit degrees. Under Stage Four, Marano Water will begin the process set forth in Arizona Revised Statues section 9-463.OG to consider adopting a moratorium on the issuance of permits and approvals for new water-consuming uses and activities. Marano Water will consider instituting a drought surcharge to Tier 3 and Tier 4 of the rate structure i.n addition to the one fox Tier 5. No potable water will be used for construction. Customers will be requested to limit landscape irrigation only to trees and shrubs one day per week and only between 8:00 p.m. and 8:00 a.m. and no irrigation of turf or ground covers. Other previous measures will continue to be in place. 1 WH ~! Town of Marano 2010 Potable Water System Master Plan .~~-,__ , .~.___.. _ . v_._ ......, ..,m.., __. _.._~. _..__. __ ~ _._ ,. _._. ___~ _ _ __ ,..,_ _ _ . tRi 7nev~ • • ~~-a_ CHAPTER 5 -FUTURE SYSTEM ANALYSIS 5.1 General This chapter presents the analysis of future development potential, calculations for the future water system demands, and recommendations for future system infrastructure upgrades for the 5-year, 10-year, 20-year, and btuldout planning horizons. The planning area for Marana Water at buildout is based on the Town of Marana limits as indicated in the adopted 2007 Town of Marana General Plan, excluding La Olsa, areas to be served by Red Rack, Tucson Water, and other water providers, and areas anticipated with low development potential. Topography for the planning area is provided by the Town of Marana Technology Services Department. Areas with existing land use were removed from the general plan database and the parcel database. The topography database was used to extend the pressure zone boundaries to the edges of the 2010 planning area. The resulting pressure zone database was used to assign the land use projections to each water pressure zone. The future system demand projections are based on the land use provided in the 2007 Town of Marana General Plan. Table 5-1: Planning Density by Land Use Category shows the planning density in EDUs assumed for each land use category. TABLE 5-1. Planning Density by Land Use ort 0.25 100% 0.25 Commercial 4 100% 4 Industrial 4 100% 4 Industrial w Densi 0.4 100% 0.4 Low Densi Residential 1.5 100% 1.5 Medium Densi Residential 4 100% 4 Park 0.2 100% 0.2 Rural Densi Residential 0.1 50% 0.05 S ecial Plannin .area 4 100% 4 Specific Plan Commercial/Industrial 4 100% 4 An EDU represents either asingle-family residence or some other water use that consumes the same amount of water as asingle-family residence. For example, as shown in Table 5.1, it is assumed that, on average, one acre of commercial land use will use the same amount of water as four single-family residences (or 4 EDUs). Exhibit 5-1 ; ~~~~~~ w. shows the areas in the 2007 General Plan associated with specific plans. For each specific plan, the Town of Marana Planning Department has provided the area in acres for each land use. Far example, one specific plan might include a combination of High- and Medium-density Residential and some Commercial land use. EDU estimates for the specific plan areas are based on the densities by land use category shown in Table 5.1 and on the assumption that buildout will be about 90-100 percent of the specific plan projections based on discussions with Town of Marana planning staff. Table 5.2: Specific Plans Used in Flow Projections shows the EDUs associated with each specific plan based on 4 EDUs per acre of commercial and industrial land use. TABLE 5-2. Specific Plans Used in Flow Projections ~VN p ;-~~,~ v , Town of Marana Potable Water S stem Master Plan ~ rwx~ ... ~=`31!2©1~J DRA~~' _ ` ~ D~ ik~IG"* CHAPTER 5: FUTURE SYSTEM ANALYSIS Pag@ ~-i t - ' Barrios De b~tarana ~ • 315 • • • ~ 20 -- • i 395 Cascada 3,419 84 3,755 Deanna 306 0 306 Gladden Farms II 2,111 210 2,951 Las Pilas 350 5 370 Mandarina 2,249 215 3,149 147arana Gardens 39 0 39 Marana Main Street 0 28 112 Marana S ectrum 0 167 66$ Pima Farms 1,621 30 1,741 Rancho 14iarana East 506 78 81$ Rancho I~iarana West 2,299 223 3,191 Sa aro S rin s 2,250 10 2,290 Sanders Grove 2,249 19 2,325 Tan Brine Commerce Park 0 112 44$ The Sho s ~t Tan Brine 0 281 1,124 The Villa es ~f Tortolita 5,849 505 7,869 U town At Marana 929 121 1,413 Grand Total 24,517 2,108 32,949 5.2 BUILDOUT SYSTEM DEMANDS The future water system analysis is based on the ultimate projected number of EDUs in the Marana Water's planning area, which will be used for long- term planning and financial analysis. As growth occurs, the future water system will expand to serve currently as yet undeveloped areas within the planning area. The projected residential units, commercial/industrial acres, and the water demands by pressure zones are presented in Table 5.3: Buildout Projection Summary. The water demands were calculated using the same demand criteria as for the existing system demands. TABLE 5-3. Buildout Projection Summary 1 4 e• s 5,406 ' ,002 ,• • 5 i 2,013 ~ • '~i~1~ i + ~ • 453 OC P9 ill~!!~~ 1 i ----- _ ~ i • s ~ 906 . .._...__. _. i • • • 1,585 B 2,591 960 0 960 216 432 756 C 2,645 980 78 1,2$9 290 580 1,015 CR 4,556 1,687 34 1,884 424 848 1,484 PR 637 236 0 370 83 166 291 V 5,562 2,060 7,065 16,385 3,687 7,373 11,060 W+ 83,724 31,009 12,818 77,385 17,412 34,823 52,235 Xla 21,331 7,900 163 8,549 1,924 3,847 5,771 X1(b,c,d 45,99$ 17,436 9,487 44,681 10,053 20,106 30,159 Y1 13,053 4,834 900 8,292 1,866 3,731 5,597 Y2 3,994 1,479 885 1,833 412 825 1,443 Y3 1,222 452 105 1,905 429 857 1,500 Z1 10,477 3,880 30 3,998 900 1,799 3,148 Z2 40 15 116 61 14 27 48 Total 201,235 74,532 31,685 169,604 38,161 76,322 116,693 Projecte d Buildout D emand 61.554 AFY w" o~ Town of Marana Potable Water System Master Plan .~_ , .......... ... ...... ~,,.~„~.~~.~.... w~..... ~a.._ ._ _ . ~.~._ ..,._ .... _. _. 5%3i~`209J CRAFT 9 ~~ an~.~ ~" ~RlCOF~ CHAPTER 5: FUTURE SYSTEM ANALYSIS Page 5- 3 5.3 YEAR -5, -10, AND -20 SYSTEM DEMANDS Growth patterns for the next 20 years were projected in order to plan for the implementation of in£rastructuxe, In addition to buildout conditions, system demands within 5 years (2015}, 10 years (2020), and 20 years (2030) were projected for planning purposes. The growth patterns for the first 10 years (2015 and 2020) care based on the assumption that growth during this time will occur in the specific plan areas and in the area surrounding the Marana Airport, and growth for the next 10 years (2030} will occur along the freeway in Pima County, at the Marana Airport, and along Tangerine Road east of I-10. The Town of Marana Planning Department provided estimates of the percentage of growth of each specific plan during Eour phases: existing, 5-year (2015), 10-year (2020), and beyond 2020. Table 5-4: Phasing of Specific Plan Development shows each specific plan and the percent of planned development estimated to occur in each phase. The period between 10- and 20-year was extrapolated from the 5- and 10- year growth data (about 2,000 EDUs per year). Growth of the area surrounding the airport was also divided by phase, with 25 EDUs per year or growth during the 5-year period and 130 EDUs per year growth beyond the initial 5-year period. The Marana Airport currently has approximately 50 EDUs. Table 5-4. Phasing A Barrios De Marana of Specific Plan -- Development (as Percent of Buil 20 50 dout) ` ~ • F 30 Cascada -- 20 40 40 DeAnza -- 15 55 30 Gladden Farms II -- 25 60 15 Las Pilas -- -- 50 50 i4iandarina -- 10 50 40 Marana Gardens -- -- 100 -- Marana Main Street -- 20 50 30 I~farana S ectrum -- 50 50 -- Pima Farms 95 5 -- -- Rancho Marana East -- -- 20 80 Rancho Marana West 15 10 50 25 Sa aro S rin s -- 15 50 35 Sanders Grove -- 10 70 20 Tan Brine Commerce Park -- 20 50 30 The Sho s rat Tan Brine -- -- GO 40 The Villa es Of Tortolita -- -- 60 40 Upto~~n r1t l~iarana - - 40 60 Table 5.5: 2015 Projected Demand Summary, Table 5.6: 2020 Projected Demand Summary and Table 5- 7: 2030 Projected Demand Summary present the Tawn a#Marana Potable Water System Master Plan 8~31P1010 GRAFT anticipated EDUs, ADD, PDD, and PHD served by Marana Water for 5, 10, and 20 years. CHAPTER 5: FUTURE SYSTEM ANALYSIS Page 5-4 TABLE 5.5. 5•Year (2015} Projected Demand Summary _ ~ ~ 1~ - ~ t ~ i _ 24 . Y ,- 1 • ~~ ~ 5 R ~ • • _ .. 11 ,/~ , DIY _ _ ~ s i • _.. 19 B 0 0 0 0 C 12 3 5 9 CR 1,861 419 837 1,466 PR 233 52 105 183 V 747 168 336 588 W+ 4,959 1,116 2,232 3,347 X1a 660 149 297 520 Xlb 718 161 323 565 X1c 259 58 117 204 X1d 420 95 189 331 Y1 1,357 305 611 1,069 Y2 0 0 0 0 Y3 1,243 280 559 979 Z1 651 146 293 512 z2 0 - ---- o a o Total 13,143 _ 2,957 _ 5,914 9,792 20 15 Projected Deman d 4,770 _ AFY TABLE 5-fi.10-Year (2020} Projected Demand Summary ' ~' ---_ ~ J! ~ f ._ ~ ~ •1 • - - ~ ! ~ f ~ _ 72 16 _ __ _ 32 __ 57 B 0 0 0 0 C 24 5 11 19 CR 1,861 419 837 1,466 PR 233 52 105 183 V 1,493 336 672 1,176 W+ 14,581 3,281 6,561 9,842 X1 a 2,043 460 919 1,609 X1b 1,863 419 838 1,467 X1c 844 190 380 665 X1d 2,933 660 1,320 2,310 Y1 2,739 616 1,233 2,157 Y2 0 0 0 0 Y3 1,243 280 559 979 Z 1 1,212 273 545 954 Z2 0 0 0 0 Total ~ 31,140 7,007 14,013 -- _ ~ 21,020 _ 20 -- - 20 Projected Demand _ - - _ _ __ 10,302 AFY ~pwh or Town of Marana Potable Water. System Master Pian ~ .. __ , - .~. .__~_w.__~, _~.._..... _........ ~... R13 ~~'2C10 DRAFT ° ~~" ~hA ~k~Ip+:' CHAPTER 5: FUTURE SYSTEM ANALYSIS Page 5-5 TABLE 5.7.20-Year (203£11 Projected Demand Summary - 1 • i • `~ ~ ~~ ~ ~~i! ~ p s ~~~ ly • ~ ~ ' ~ • 1 i ~ ` ' • • • 6 f ~ 513 115 231 404 B 216 49 97 170 C 271 61 122 213 CR 1,884 424 848 1,484 PR 233 52 105 183 V 2,771 623 1,247 2,182 W+ 23,243 5,230 10,459 15,689 X1 a 3,227 726 1,452 2,541 X1 b 3,814 858 1,716 3,003 X1 c 2,872 646 1,292 2,262 X1 d 5,41 G 1,219 2,437 3,656 Yl 3,765 847 1,694 2,965 Y2 460 104 207 362 Y3 1,712 385 770 1,348 Z1 1,843 415 829 1,451 Z2 61 __ _ 14 27 _ 48 Total 72,300 11,768 23,535 _ 37,962 203 0 Projected Demand 18,98 1 AFY 5.4 FUTURE SYSTEM SIZING AND REQUIREMENTS The water system design criteria that were established in Section 4.2, Existing System Design Criteria, are also used to develop the future water system capacity requirements for the Town's water systems. Future system requirements include well capacity, storage capacity, booster capacity, and transmission mains to serve buildout and phased system demands. 5.4.1 Source Capacity Potable water production capacity requirements are based on meeting PDD with the largest well out of service. A summary of the well capacity requirements for the 5-, 10-, 20-year and buildout projections are presented in Table 5-8. Future Source Capacity Requirements Summary. The source capacity requirements in Table 5.8 include reserve well capacity. Based on historic consumption records for the region, the PDD is twice the ADD. The PDD for Marana Water at buildout is approximately 76,322 gpm (Table 5.3). The reserve well capacity is anticipated to be approximately 9,100 gpm at buildout (10,330 gpm from Table 5-$ less 1,230 gpm, which is not needed when the pressure zones X1b and Xlc are interconnected). Based on these projections, Marana Water will be required to maintain a production well capacity of approximately 85,422 gpm at buildout. Town of Marana Potable Water System Master Plan 8/3 912 0 9 0 DRAFT ~v`vnr ~ - 7 9 M,~ A t~ ,. 1 ~R,ZVMR CHAPTER 5: FUTURE SYSTEM ANALYSIS page ~~, Table 5.8. Future Source C Summary r1 B Y1 C 2,097 1,150 2,070 2,971 3,484*' 6,740'' 4,643 Z1 Y1 X1b 2,285 1,230 1,553 2,068 2,946 X1 X1c 4,207 2,000 2,117 2,380 3,292 23,965"' 17,325 Xld 58 3,077*' W X1a -- 1,700 4,418 10,501 + W+ 3,820 13,612 40,370 36,550 V1 ~ V1 ~ -- ~ 1,500 ~ 1,836 ~ 2,172 ~ 2,747 ( 8,873 ~ 8,873 Y2 Y2 -- 1,000 -- -- 1,234 1,852 1,852 Z2 CR CR PR 2,950 1,750 3,252 3,252 3,473 3,622 672 Y3 Total 15,417 10,330 15,244 23,343 33,865 $5,422 70,005 *1 Includes half of the PDD for the Z1, A, B, and C pressure zones as the source water in these pressure zones are assumed to supply by X1 and Y1 Zone. Marana Water has existing potable well capacity of approximately 15,417 gpm. Assuming the existing wells in the Town maintain the same production capacity, the additional source capacity required to serve buildout demands is projected to be 70,005 gpm. Approximately 47 new wells at 1,500 gpm each is required to meet its ultimate source capacity requirements assuming all source water is provided via wells. Marana Water currently owns 1,528 AFY CAP water rights. The projected buildout water demands for the Town are approximately 61,554 AFY. To achieve the goal of safe yield, an additional 60,026 AFY of renewable water sources are required. Marana Water is working proactively to secure its renewable water sources, which includes control of the water reclaimed from sewage conveyed by Marana owned sewers. Marana Water intends to introduce CAP water as an alternative source of potable water to its service areas. Ttivo alternatives to serving CAP water to the Marana Water potable system include recharge and recovery wells and/or surface water treatment plant and blending with groundwater. Town of Marana Potable Water System Master Plan ~;3 910 7 0 CRAFT ~ ~,. ~ . F_ _....~ , . _ . ~.~....~ 5.4.2 Storage Storage sizing requirements are based on meeting 150 percent of the ADD, plus fire flow. It is recommended that at least 25 percent of the required storage capacity be allocated as gravity storage that feeds the pressure zone by gravity, if it is not practical to place all as gravity storage. Fire- flow demands will either be served from the ~pwn or 9 ~Q~~~~ 7 E ~ h. r !;, iZ~Kw CHAPTER 5: FUTURE SYSTEM ANALYSIS reservoir that floats the zone or from a reservoir that serves the zone indirectly through boosters or PRVs. Fire flow was generally assumed to be 2,000 gpm far two hour duration for the pressure zones that include zoned commercial and/or industrial use unless a larger fire flow requirement has already been established within the existing service areas. In addition, the existing fire flow requirements for the CR (Continental Reserve) and PR (Picture Roc)~s) as of 1,500 gpm and 700 gpm, respectively, for two hour duration were assumed as these areas are near buildout and no substantial growth is anticipated. Page 5-7 The storage requirements per zone are presented in Table 5.9: Future Storage Capacity Requirements Summary. The primary storage facilities for Marana Water are planned for the V, W+, X1, Y1, Z1, PR, CR, and Y3 service areas. At buildout, Marana Water requires approximately 77 million gallons of additional storage distributed throughout the system to meet the storage criteria, all of which is required to meet future demands as the existing system has an excess storage capacity of approximately 3.1 million gallons. Table 5.9. Future Storage Capacity Requirements Summary ~ $r'+" y ~ ~, X4"4 ~, 5#~" '"~' 3$ ~, u?, I` r • ' ~ s _ i • • _ 1~ 11,664 ~ 34,992 249,318 978,31$ ~ B -- 240,000 0 0 104,976 466,435 2,311,207 C 5,832 11,664 131,706 626,454 Z1 Z1 1,100,000 240,000 316,192 588,838 895,504 1,943,028 1,083,028 Yl Y1 185,000 240,000 659,502 1,331,154 1,829,790 4,029,912 4,084,912 X1b 1,940,000 240,000 348,705 905,175 1,853,361 X1 X1c 525,000 330,000 125,874 410,184 1,395,792 21,714,745 19,569,745 X1d 10,000 240,000 204,120 1,425,438 2,632,176 W+ X1a 240,000 320,760 992,898 1,568,322 4,154,814 W+ 2,075,000 300,000 2,410,074 7,086,366 11,296,098 37,609,110 39,988,924 V V 240,000 363,042 725,598 1,346,706 7,963,095 8,203,095 ~'2 Z2 240,000 0 0 29,646 29,646 Y2 240,004 0 0 223,560 890,838 1,160,484 CR CR 1,000,000 180,000 904,446 904,446 915,624 915,624 95,624 PR PR 100,000 84,000 113,238 113,238 113,238 179,809 163,809 ~'3 Y3 1,000,000 300,000 604,098 604,098 832,032 925,830 225,830 Total 7,935,000 - 6,387,547 15,134,089 25,417,849 82,427,658 76,886,658 * Includes fire flow requirement. 5.4.3 Boostet Stations Booster station sizing is based on providing PDD plus fire flow or PHD, whichever is larger, for the pressure zone without gravity storage. When gravity storage is provided for a pressure zone, the booster station requirement is to provide PDD for the zone and all that need water from the zone.. Table 5-14: Future Booster Station Capacity Requirements Summary provides the anticipated booster station capacities for the 5-pear, 10-year, 20-year and buildout planning horizons. If the floating reservoir storage required to provide fire flow has not been built, the booster station may require additional capacity to provide the interim fire-flaw requirements. O'"ti ~r Town of Marana Potable 1Nater System Master. Plan ~:_. - -- , 6/s1t2090 DRAFT ~RJlOW a CHAPTER'S: FUTURE SYSTEM ANALYSIS Page 5- 8 Table 5.10. Future Booster Station Summarv`~ ~ 2,000 14 38 340 1,412 1,412 B 2,000 0 0 2,158 2,722 2,722 C 2,000 2,005 2,011 2,122 2,580 2,580 CR 3,000 1,500 3,002 3,002 2,838 2,943 (57)*z PR 1,000 700 805 805 805 866 (134)`2 V 2,000 2,336 2,672 3,247 7,373 7,373 W+ 6,720 2,500 4,921 12,342 17,517 34,823 28,103 Xla 1,300 2,000 2,297 2,919 3,452 5,847 4,547 X1b 6,180 2,500 2,823 3,338 4,216 X1c 4,900 2,750 2,$67 3,130 4,042 21,965 10,765 Xld 120 2,000 2,189 3,320 5,077 Yl 2,100 2,000 2,920 3,821 4,334 5,590 3,490 Y2 2,000 0 0 2,234 2,852 2,$52 Y3 3,100 2,500 3,059 3,059 3,270 3,357 257 Z1 2,085 2,000 2,309 2,588 3,279 3,717 1,632 Z2 2,000 0 0 2,027 2,027 2,027 Total 30,505 - 31,545 43,045 60,960 98,075 67,570 --- -_: _ '~ The 5-, 10-, 2fl-year booster capacities are based on providing PDD plus fire flow or 1'Hll, whichever is greater. The booster capacity at buihdout is based on PDD plus fue flow or PHD, whichever is greater when no gravity storage is provided. With gravity storage, the booster capacity is based on providing PDD. Gravity storage is assumed to be provided for the V, W+, X1, Y1, Z1, and rl zones. ~z Indicates excess booster capacity of the zone. 5.4.4 Gravity Storage Transmission System A number of new transmission mains are required to transport the gravity storage water throughout the distribution networks. Table 5.11: Transmission Line Extension Summary presents the transmission line extension projects, lengths, and purposes of the extensions. These transmission mains are typically funded by Marana `dater and the cost will be recuperated through gravity storage and renewable water resources fees and infrastructure impact fees. Construction and upgrades of internal distribution systems and main extensions for developments and growth are typically the responsibility of the developers; therefore are not included in this Master Plan. ~ WN ~f Town of Marana Potable Water System Master Plan ~kizcr~. CHAPTER 5: FUTURE SYSTEM ANALYSIS Page 5-~~ ~as~~ ~--i~. i rar~sm~ssea n Line txtensron ~ummar~ • ~.. . " ~ s V Zone 24-inch Gra~~in' Main from V Zone Reservoir • 10,600 To rovide ravi stora e to the V Zane W+ Zone Marana Road 16-inch Main for Santa Cruz To provide water to the system on both River Crossin 3'000 sides of the Santa Cruz River W+ Zone Sanders Road 24-inch Main from Airport to I- 10 25,400 To provide gravity storage to the W+ Zone W+ Zone 48-inch Main from Tortolita Mountain W+ Zone Reservoix 11,000 To provide gravity storage to the W+ Zone W+ Zone 36-inch Main Connecting Sanders Road 24-inch & Tortolita Mountain 48-inch (includes Railroad/I-10 3,600 To provide gravity storage to the W+ Zone crossin W+ Zone 24-inch Main to the north of Village of Tortolita includes Railroad/I-10 crossin 30,000 To provide gravity storage to the W+ Zone X-Zone Sandaxio Road 24-inch Main fxom South X-Zone Reservoir 10,300 To provide gravity storage to the X Zone X Zone 36-inch l~fain from the Tangerine Road X-Zone Reservoir 7,600 To provide gravity storage to the X Zone X Zone Tangerine Road 24---inch from the 36-inch Main includes I-10, CAP, Railroad crossin 4,800 To provide gravity storage to the X Zone X Zone 24-inch South of Tangerine Road, includes I-10 crossin at Avra Valle Road 12,000 To provide gravity storage to the X Zone Z-Zone Camino De I4ianana 16-inch Main 7,100 To rovide avi stora a to the Z1 Zone Hartman Vistas to Cortaro/Oshrin PRV and 8-inch I1~Iain 1,350 To rovide redundant ca achy to Y1 Zone Y-Zone 16-inch I~fain From Cortaro Farms Road to Linda Vista Blvd 15,500 To provide gravity storage to the Y1 Zone Y-Zone Twin Peaks 24-inch Main 4,000 To provide gravity storage to the Y1 Zone west of I-10 Y Zone Linda Vista Blvd Parallel 12-inch Main to Hartman Vistas Reservoir 7,200 To provide gravity storage to the Yl Zone A Zone 16-inch GravitG- Main 4,300 To pro~~ide gravity storage to Al Zone Town of Marana Potable Water System Master Plan 8J~1/~010 QRAFT CHAPTER 5: FUTURE SYSTEM ANALYSIS page 5-lU 5.5 PROPOSED FACILITIES -FUTURE SYSTEM REQUIREMENTS The facilities proposed to meet the buildout system requirements are shown on :;'` , . a-, = ;;~~ •r 4 ~u:l~„,~~.s ~ ~ ~ ~ ~,~;. ~ ;~y' ~r - , and on Ex~ibig 5.3; Proposed ~.Mii=~ ~~~~~~~~~ .. ~1; ~ ~.~~:.~r~9 ~~~~~C'°t ~ ~°~ ~~ ~ =~~`r. "Exhibits 5-2 and 5-3 have been removed for security purposes under the Public Health Security and Bioterrorism Preparedness Response Act." The locations/routings of the proposed infrastructure improvements on these figures are conceptual. The actual locations of these infrastructures will need to be evaluated and determined as the involved CIP projects evolve. Table 5.12: 10-Year Capital Improvement Projects presents the proposed 10-year capital improvements projects related to future growth for Marana Water. These requirements are based on the assumption that the infrastructure improvements proposed to meet existing system requirements, as listed in Chapter 4, have been constructed. TABLE 5-12.10-Year New W+ Zone North Sanders Water Plant Well New W+ Zone Barnett Well & Pipeline to Marana Park Reservoir Re-equip the existing Y Zone Twin Peaks Well New Y Zone Twin PeaksWell {Re-drill & Equip) Equip Cortaro-Oshrin (Y-Zone) Well CMID Well Purchase New 1.0 l~iG W+ Zone North Sanders Water Plant Forbay Reservoir New LO R•iG W+ Zone Airport Elevated Floating Reservoir New 1.0 MG W+ Zone Marana Park Forbav Reservoir New 1.0 iV1G X Zone Tangerine Road Floating Reservoir New 1.0 I~iG Z Zone Camino De Itila.nana Floating Reservoir New 0.25 MG Y Zone Pioneer Well Forbay Reservoir New 0.25 MG Y Zone Cortaro-Oshrin Forbav Reservoir New 3,000 gpm W+ Zone North Sanders Water Plant Booster Station New 2,000 gpm W+ Zone ~~irport Booster Station New 2,000 gpm Tangerine Road W+ to X Zone Booster Station New 2,000 gpm X-Zone Booster Station at ~-~irport SE Well Site New 2,000 gpm Pioneer Well Site Booster Station New 2,000 gpm Y-Zone Cortaro-Oshrin Booster Station Upgrade 800 gpm Continental Reserve to Picture Rocks Booster Station to 1500 rn Mira Vista W+ Zone Sanders Road 24-inch Main from ~~irport to I-10 X Zone Tangerine Road 24-inch Main Crossing I-10, CAP, and Railroad X Zone 36-inch Main from Tangerine Road X Zone Reservoir X Zone Tangerine Road 24-inch Main from 36-inch Main to I-10 Z Zone Camino De Manana 16-inch Main Hartman Vistas to Cortaro/Oshrin PRV and 8-inch Main Y Zone 16-inch Main From Cortaro Farms Road to Linda Vista Blvd Y Zone Twin Peaks Road 24inch Main Picture Rocks 2358- Zone 8-inch Itiiain from ~~1ade/Ina Road to the Springs Resen-oir } W h U/ Town of Marana Potable Water System Master Plan , _ ;., .:__ , 8/31/2010 DRAFT ` ~~~~~~ ' .~ r S%rlr0'`~ CHAPTER 5: FUTURE SYSTEM ANALYSIS Page 5- t ! Table 5-13: Buildout Capital Improvement Projects presents the capital improvement projects for Marana Water at buildout, assuming the 10 year capital improvement projects have been completed and in operation. TABLE 5-13. Buildout 44 new 1,500 fpm Wells New 700 m Y3 Zone Well the ~ nc1 s s ~stem`~ 49 MG Forbay Storage in V, W+, X, Y1, and Y2 2.0 MG V Zone Elevated Reservoirs 8.5 MG W+ Zone Tortolita Mountain Reservoir 6.5 MG X Zone Tangerine Road Reservoir 2.0 MG X Zone South Floating Reservoir 1.0 NiG Z1 Zone Camino De Mariana Reservoir 3.0 MG 1-1 Zone Tan~r:rine Road l~lt~atin~ Reservoir :•.- - 17 new 3,000 gpm booster stations in V, W+, ~, and Y2 New 2,000 gpm X to Y1 Zone Inline Booster Station _ New 2,000 gpm Y1 Zone Booster Station at Tangerine Road X.Zone Reservoir New 2,000 gpm Z1 Zone Booster Station at Tangerine Road X Zone Reservoir New 2,000 m Z1 to ~1 Zone Inline Booster Station New1,500 m B1 Zone Booster Station at Camino De l~ianana Z Zone Reservoir New 1,500 gpm B to C Zone Inline Booster Station New 1,500 gpm B Zone Booster Station at Tangerine Road 1~ Zone Reservoir New_1,500 gpm C Zone Booster Station at Tangcrinc Road 1'1 Zone Reservoir New 2,100 gpm Y1 to Z3 Zone Inline Booster Station New 2,100 m Y2 to Z2 Zane Inline Booster Station V Zone 24-inch Gravity Main from V Zone Reservoir W+ Zone Marana Road 16-inch Main for Santa Cruz River Crossing W+ Zone 48-inch I41ain from W+ Zone Tortolita Mountain Reservoir W+ Zone 36-inch Main Tortolita Mountain 48-inch Main to I-10/Rialroad Crossings W+ Zone 24-inch Main North Route of Village of Tortolita X Zone Sandario Road 24-inch Main from South X-Zone Reservoir X Zone 24-inch Main South of Tangerine Road 36-inch Main Y Zone Parallel 12-inch Main along Linda Vista Blvd to Hartman Vistas Reservoir ~ Zone 16-inch Gravity Main from Tangerine Road 1-~ Zone Reservoir ~owv or Town of Marana Potable ~IVater System Master Plan ; -,=_-:__ , 8/31.'Z~J 10 fl~~F r _ a ~.~ ~~ r ,~~ i p; ~p*:* Pinai County Town of Marana General Plan 2007 and Specific Plans 2010 Marana Water Master Plan Exhibit 5-1 • • : CHAPTER 6 -INFRASTRUCTURE COST PROJECTION This chapter presents the cost estimates for the infrastructure improvements recommended in both Chapter 4 (bases on existing system requirements} and Chapter 5 (based on future system requixernents) fox Marana Water. The 10-year and buildout CIP, as well as associated cost projections are provided in Table 6.1: Marana Water 10•Year (2020} Capital Improvement Projects and Table 6.2: Marana Water Buildout Capital (mprovement Projects following the text of this Chapter. The following sections present the assumptions made in projecting the infrastructure costs. the installation of transmission mains required for distributing gravity storage within the buildout CIP. Based on recent bids of similar projects for Marana Water and standard assumption of soil conditions, the following costs were used as baseline numbers for water main installation cost estimates: $150 per lineal feet (1#) of 8-inch water main from Wade Road/Ina Road to the Springs Water Plant site, and from Hartman Vistas service area to Cortaro/Oshrin service area along Hartman Lane. 6.1 COST PROJECTION ASSUMPTIONS AND CRITERIA Cost projections for construction of the proposed water infrastructure are provided as a basis for financial planning for Marana Water. The cost estimates are based on construction of the projects at present day prices. Appropriate inflation factors should be added when using these estimates for CIP budgeting and financial planning. Over the past several years, Marana Water has bid several reservoir, booster station, well, and transmission main projects. The bid schedules from those projects were used as a basis for determining the costs of the proposed water infrastructure. Actual costs may vary depending on extreme site conditions, site acquisition, soil conditions, security measures, and replacement and/or disposal costs for existing facilities b.1.1 Pipeline Replacement Projections in the Master Plan indicate that some existing 4-, 6-, and 8-inch water mains within the Marana Water's old service areas will need to be replaced as Marana Water has determined the existing mains are undersized and have exceeded their useful service life. Per Marana Water, the estimated main replacement cost within the next 10 years will be approximately $5 million. This cost assumption includes valves, fittings, fire hydrants, appurtenances and minor pavement replacement required for the installation of the proposed water mains. The cost assumption does not include easement acquisition. 6.1.2 Installation of Water Mains This Master Plan projects both the need for new water main installations within the 10-year CIP and, $160 per if of 12-inch water main parallel to the existing 12-inch main at Linda Vista Blvd $170 per if of 16-inch water main throughout Marana Water's service area $200 per if of 24-inch water main throughout Marana Water's service area $250 per if of 36-inch water main throughout Marana Water's service area $300 per if of 48-inch water main throughout Marana Water's service area The above cost assumption includes valves, fittings, fire hydrants, and appurtenances required for the installation of the proposed water mains. Depending on the specific site conditions such as the number of wash crossings, and pavement replacement, the cost estimate assumptions may vary. 6.1,3 Installation of Welded Steel Reservoirs Projections of the storage requirements indicate 77 million gallons of storage, in addition to its existing storage capacity, will be required for Marana Water at buildout. The two most commonly used types of storage facilities are welded steel reservoirs and below ground concrete reservoirs. Welded steel reservoirs are generally less expensive to install than concrete reservoirs. A welded steel storage reservoir is typically no larger than one million gallons in size. Based on recent bids for Marana Water and standard assumption of soil conditions, the following costs were used for welded steel reservoirs: $300,000 to $350,000 for a 250,000 gallon reservoir depending on specific site conditions. $800,000 for a one million gallon reservoir. ~~ o~ Town of Marana Potable Water System. Master Plan , _ ~-___,__ , _ __ _ `.. ~,r31~'2010 i?RAFT _ ~` ~`~°'~ '~'!n?»" CHAPTER G: INFRASTRUCTURE COST PROJECTION Page 6-~ The above cost assumption includes the steel reservoir, required site work, site piping, telemetry, site grading, block walls, and landscaping. This cost does not include site acquisition. 6.1.4 Installation of Buried Concrete Reservoirs As the size of reservoirs increases, the aesthetic impacts of larger aboveground reservoirs increase. In high-profile areas, it becomes difficult to install aboveground steel reservoirs. To address public concerns, most municipal water providers have specified buried, concrete reservoirs wherever possible to minimize the aesthetic impacts to the neighbors. The site acquisition and construction costs increase for the installation of buried, concrete hopper-bottom reservoirs. but of the 77 million gallons of storage proposed, it is estimated that 15 million gallons (W+ Zone Tortolita and X Zone Tangerine Road reservoirs) wall be stored in buried concrete reservoirs with steel roof structures. A cost of $1.50 per gallon of storage is estimated for buried concrete reservoirs proposed in the Master Plan. This cost assumption includes the concrete reservoir, steel roof structure, excavation, site work, site piping, telemetry, and block walls. This cost does not include site acquisition. 6.1.5 Installation of Elevated Reservoirs Two elevated storage reservoirs (the 1.0 million gallon W+ Zone Airport Reservoir and 2.0 million gallon V Zone reservoirs} are recommended in this Master Plan. A cost of $2.0 per gallon of storage is estimated for the elevated storage reservoirs. This cost assumption includes the reservoir, steel roof structure, riser column, site work, site piping, and telemetry. This cost does not include site acquisition. 6.1.6 We1lInstallations It is projected that approximately 47 new wells at 1,500 gpm each will be required to meet the supply demands of Marana Water at buildout. Based on recent bids for Marana Water and applying standard assumptions for drilling rig requirements for access, a cost of $800,000 was assumed to drill and equip a new well. This cost includes standard drilling operations, well casing, sanitary seal, well column tube and shaft, and pump motor bowl assembly, assuming the wells are to be drilled using the reverse circulation air rotary drilling rig. It is assumed that two wells would typically pump to a water plant storage facility, with one well at the plant site and the second well approximately 1,000 feet apart. Assuming a 12-inch dedicated water line is used to collect the well water to the reservoir, an additional $200,000 is required for the offsite well construction. For the purpose of cost estimates in this Master Plan, the calculation was simplified by increasing the cost to $900,000 for drilling and equipping each new well. 6.1.7 Booster Stations In addition to the existing booster capacities of Marana Water, this Master Plan projects twenty (20 new) 3,000 gpm booster stations, eleven {11 new} 1,500 to 2,000 gpm booster stations, and four (4} 1,500 to 2,000 gpm in-line new booster stations at buildout. Based on recent bids and standard assumption of soil conditions, of the cost estimates range from $400,000 to $900,000 each new booster station, depending on the size and location of the facility. 6.1.8 Interstate 10, Railroad, and CAP Crossings This Master Plan projects several water line crossings over Interstate 10, Union Pacific Railroad (UPRR}, and CAP canal. The installation of these crossings is assumed to be by "jack and bore". The cost estimates for those crossings range from $1 million to $1.5 million depending on the size and location of the water lines. This cost assumption does not include site or easement acquisition. 6.1.9 Engineering and Contingencies Due to the planning nature of the locations of the facilities proposed in this Master Plan, contingencies are added to reflect unforeseen conditions that may affect the individual projects. Unforeseen conditions can range from environmental issues that may need to be addressed in individual projects, to easements that may need to be acquired for pipeline construction. This cost component also includes engineering fees, permits, inspection, and project management. The cost assumptions provided above include 20 percent engineering and contingencies. 6.2 10-YEAR {2020} CAPITAL IMPROVEMENT PLAN COST PROJECTION Town of Marana_Potable,Water S~stemyMlaster Plan 8/3?/ZQ10 DRAFT ,~~o~ __ ~ .- q r~ a ~~A , ,.~ 'krro'~' CHAPTER s: INFRASTRUCTURE COST PROJECTION Page 6-3 Table 6-1 lists the 10-year (2020) CIP for Marana Water. The cost estimates for these projects, based on the present day price is approximately $33.5 million, out of which, $7 million is allocated to the upgrades required to bring the existing system up to current standards, and $26.5 million is allocated to growth related system upgrades. 6.3 BUILDOUT CAPITAL IMPROVEMENT PLAN COST PROJECTION Table 6.2 lists the buildout capital improvement plan for Marana Water, assuming all the 10-year CIP have been completed. The cost estimates for the buildout CIP, based on present day prices, is approximately $143 million. Town of Marana Potable Water System Master Plan 831/2010 G~RAFF _.,_.~..~ ~ arh U! q ~~, . ,~!v~ j '~kIZO~"~ Table 6-1 MARANA WATER 10-YEAR (2020) CAPITAL IMPROVEMENT PROJECTS Fro'ect I Year Capacrty Pipe Length (feet) Existing System Upgrade Cost Expansion Related Cost Remarks New W+ 'lone North Sanders Watet Plant Wcll 2017 1,500 gpm _ - $800,000 Approximately 1,500 gpm new well feeds to a new onsite reservoir. New 1V+ Zone Barnett Well & Pi • ' ~ ~ ~ pcltne to R[arana Part. Re,erorr 2012 1,500 gpm - S1,30D,000 Approximately 1,500 gpm new well feeds to the Manna Park reservoir via dedicated well collection line. Re-equip Y-'7,one Pioneer 1~Ucll 2012 350 gpm - 5250,000 New Y-7.one Pioneer Well Re-dn71 & Equip 2017 500 gpm _ - 5500,000 Equip Cortaro-Oshrin (Y-/.one) Well 2015 1,500 gpm - - 5250,000 Approximately 1,500 gpm existing well feeds to a new onsite reservoir. CMID Well Purchase New W'+ 'Lone North Sanders ~X'ater Plant Forba ~ Reservoir } 2011 2017 _ 1. A 0 ZU - - - - 51,500,000 5800,040 nt site e s ~ l ~ ment. Located at the new Water Pla a,t of Sanders (Hove de~e c p .~ < ' New 1V+ 'Lone Airport f~;lcwated Floating Reservoir 2020 1.0 ATG - - 52,000,000 Located at the I4larana Regional Ai~ort NW Water Plant site. ,M^-. New W+ Zone A4arana Park Porba Reservoir ~;( y 2013 1.011IG - - 00 000 SS , Ncw X-Zone T'an trine Road I']oatin Rcscrroir g g ;. 2015 1.0 MG - - 5800 000 New X-Zone T'orba ~ Reservoir at ~~i ort SF: W'cll Site } m ~. 2020 0.25 MG - 5300 DDO - I'or 4•la virus treatment tom li<~€nce g p -~i New Z-Zone Camino De Maiiana l~loadng Reservoir „,: 2412 1.0 bIG - - 5800,400 '> New Y-Zone horba - Reservoir at Hartman Vistas Well Site } 2015 0.25 MG - 5340 000 - Far 4-lo virus treatment tom fiance g P ~NewY-Zone I'ionecr Well Forbay Rcscnrotr ;° 2017 0.25 MG - - $300,000 :;.~ Itew Y-Zone Cortaro-Ushnn 1 orbay l~escrvoir ..015 0.25 MG 5300,000 New Watet Pant at Oshnn Park ~" ~ New Picture Itveks Reservoir New lw'+ Gone Nortt Sanders Water Plant Booster Station 2012 2017 0.25 MG 3,000 gpm - - 5140 000 - 5210 000 $000,000 Located at the new Watet Plant site east of Sanders Grove development. New 1V+ Zone Airport BOUSti:t Station 2018 2,000 gpm - - 5000,000 Located at the Airport NW Water Plant, pumps to 1C~'+ Zone Ne 'fan ~ + • w genne Road W to X lane Booster Station ~ ..012 ~ ..,000 gpm _ - 5900,000 ]mine booster station, also includes a PIiV for dclircring water to W+ Zane in case of emer enc New X-Zone Booster Station at Airport SI': Welt Site 2020 2,000 gpm - S200,D00 - For 4-log virus treatment compliance New Y-Zone Booster Station at Hartman Vistas Well Site 2015 2,000 gpm - 5200,000 - For 4-log virus treatment compliance • New Pioneer Wcll Site Booster Station .. 2017 2,000 gpm - - 520(},000 New Y-Zone Cortaro-Ushrin Booster Station 2015 2,000 gpm - - 5200,000 Upgrade 800 gpm Continental Resen>e to Picture Rocks Booster 5tadon to 1500 gpm (b}~ Mira ~tsta) _ W+7,one Sanders Road 24-inch Alain from A' n I-1 up rt to 0 2012 ~ ..018 1,500 gpm - - 25,440 - - 540,000 ~ 54,100,000 5 n 'ruz 'v ~r cr ~~' Includes ~ a to (, R~ c o, ~tng X-Zone '1'angerinc Road 24-inch Alain Crossing I-10, CAl', and Railr a as 2012 - 800 - 51,100,000 Includes I-10, CAP, Rail Road crossing ~~~ X-Zone Tan nine Road 24-inch'~Iain fmm 3G-inch to )~:ast I-10 ~~ ~ a 2015 - 4 000 - S80Q 000 , X-Zone Tan trine Road 3G-inch 'Hain from X-lone 'fan erine Road g g ` ;Reservoir 4 i! 4;,' 2015 - 7,600 - 51,900 000 Includes 1-16, CAP, R1i1 Road cross~n g „ Z-Zane Canuno De banana 16-inch Main 2010 - 7,100 - 51,100,000 hIartman Vistas '/.-'7,one to Cortara-Ushrin '-Zone PRV and 8-inch ~ ) ~ ) ;Main at ]Iartman Lane i Q11 - ,350 47,000 253,000 > > Includes I Rt a d, ~ Y-Lone 1G-inch Main from Cortaro Farms Road o Linda Vista Blvd t 2 2 0 0 - l5 500 - 2 $ ,540,000 Y-Zone 24-inch Alain alon 'l'udn Peaks Road K 2010 - 4 000 - S1 600 000 Includes I-1D, Rail Road, and Santa Cruz River cross' ~ 'Picture Rocks 2358- Zone 8-inch Main from Wade/1na Road to the S ~ . 1tc5L'tvUit 2014 - x,500 5825,004 - ~a "1'v'ater ~Maln Rehabilitabou Replacement ~ .. . 2012-201? - - 55,000,000 - . ___. total ,. .k.,_, $7,012,oa0 ~2G,503,600 W;Ijobs1500's1527.0112D09 Water Master PIanlMaster Plan Report110 year 8, Buildout CIP.xIs Table 6-2 MARANA WATER BUILDOUT CAPITAL IMPROVEMENT PROJECTS Pro'ect l Quaatrty Unrt Present Worth Present Worth Remarks Unit Cost Total Cost T N ecv 1, 500 gpm Wells 44 EA $800,0(10 200,000 $35 Approximately 1,500 gpm new well feeds to new onsite reservoir: G wells for V 1 , , Zone 20 far W+ Zone 14 for X Zone Z for Y2 Zone and 2 for ~ 1 and u er 700 gpm Springs Well 1 EA $500,000 $500,000 Provides suppy to Y3 (the existing Springs system) Subtotal 45 - - $35,700,000 z-. 1 I S $40 000 000 000 000 $40 _. Forbat~ stora e: 6.2 MG for Vl Zone, 24.3 MG for W+ Zone, 17.3 MG for X g ,, , , , , ,~;~ 49 MG Forbay Storage Zane, 1.2 ASG for Y2 Zone. ;;; N w 2.0 MG Elevated V Z e one Storage i'., 1 EA $3,500,000 $3,500,000 `~~~ r + ~m N ew 8.5 MG Tortollta l~Iountatrr W Zone Reservoir 1 EA S13 000 OOD $13 000 000 > ~` "New G.51*iG Tangerine Road X Zone Reservoir ,~ 1 E.~ $10,000,000 $10,000,000 '' "~ ,,;New 2.0 MG South X Zone Reservoir 1 EA 1 640 000 $ + ~ 1600 000 $ > > ,~ New 1.6 B1G Z-Zone Camtno De 114anana Reservoir 1 EA $800000 $800 000 ~'+ New 3.0 ATG Tangenne Road A Zane Resen ou 1 EA 2400 000 $ ~ 2400 000 $ > > 5ubtotaI w . , . ~ ~ ,~.. ......~_ ..... _, ..__ ... w, New 3,000 gpm Booster Stations in V, ~U+, X, and Y2 - 19 - _.. EA - _~...,~~.._.. _ $000,000 $71,300,000 . ,. ~ $11,400,000 ..._.... ,-._~aT..,.~..a.. J,.-,4...~.- .,~.- _ , o.. X Zone ~ d 1 for Y2 3 booster station for V1 Zone, 9 for W+ Zone, 6 f r , an Zone. New 2 000 m Y1 Zone Boaster Stations at Tan Brine Road X Zone Reservoir gP g 1 EA $200,000 $200,000 New X to Y1 Zone 2,000 gpm Inline Booster Station 1 EA $900,000 $900,600 New Y2 to 7.2 Zone 2,100 gpm Inline Booster Station 1 EA $904,006 $900,000 New 2,000 gpm Z1 Zone Booster Station at Tangerine Road X Zone Reservoir ~ EA $204,004 $200,000 Necv 1,500 m B Zone Boaster Station at Camino De 1~Ianana Z Zone Reservoir 1 EA $400,000 $400,000 New 1,500 m B to C Zone Inline Booster Station gP 1 EA $600,606 5600,000 New 2,000 m Z1 to 1~ Zone Inline Booster 5tatioa 1 1~~ $900,064 5900,000 B Zone 1,500 gpm Booster Station at ~ Zane Tangerine Road Reservoir 1 EA $400,000 5400,000 C Zane 1,500 m Boaster Station at A Zone Tan Brine Road Reservoir gP g 1 ~~ $900,000 $900,000 Subtotal V Zone 24-inch 111ain from Floatin Reservoir g 28 10 600 - FT - $195 $16,800,000 52 OG7 000 > "~ `W+ Zone ~iarana Road 1G-inch plain for Santa Cruz River Crossin ~. g 1 E:~ $500,000 $500,000 Crossing Santa Cruz River '; W+ Zone 48-inch Main from W+ Zone Tortolita Mountain Reservoir 11000 F"1' 5300 $3,300,400 Includes CAP crossin g W+ Zone 36-inch Main near I-10 ~:~ 3 600 FT $250 $900 000 , W+ Zone Sanders Road 3G-inch Main Crossin I-10 and Railroad g 1 EA 1200 000 $, 1200 660 $, Includes I-10 and Railroad crossin g ~\'+ Zone 24-inch Main North Route East of 1-10 30,000 FT $180 55,400,060 ~~`+ Zone 24-arch Main North Route Crossin I-10 and Railroad g 1 EA $1000,000 ~ 51,000,040 Includes I-10 and Railroad crossi '~ X Zone Sandario Road 24-inch Main from South Floating Reservoir 10,300 FT $195 $2,008,560 Includes CAP crossing 7.one 24-inch :41ain South of Tangerine Road 36-inch Main 9,000 FT 5195 $1,755,006 X 7,one Avra Valley Road 24-inch Main Crossing I-10 and Railroad 1 EA $1,060,006 $1,000,606 Y 7,one Parallel 12-inch Main along Linda Vista Blvd 1,500 FT' $160 $246,000 Subtotal .. _. Total - - - $19 370 500 > > $143170 500 > > W:Ijabs150D's1527.0112009 Water Master PIanlMaster Plan Report110 year & Buildaut CiP.xls • • .. CHAPTER l - IMPLEMENTATION 7.1 INTRODUCTION The implementation portion of this document provides a roadmap for Marana Water to facilitate the recommended improvements. A set of baseline evaluations for source, storage, and booster station capacity have been established for use by Marana Water in performing annual evaluations for infrastructure requirements, capital improvements, and required upgrades for both the existing and future system. These infrastructure and cost data will allow Marana Water to continually evaluate the capital components associated with the capacity and operational upgrades of the potable water system. These criteria may then be used to establish and continually evaluate the connection fees within the defined service areas of Marana Water. The criteria may also be used to define capital components for the existing rate payers for infrastructure upgrades required for the existing system to meet its established standard for service. Water Master Plan updates are recommended to be annually completed as part of the Marana Water annual report. 7.2 CAPITAL IMPROVEMENTS IMPLEMENTATION The 10-year (2020} and buildout CIP, as shown in Tables 6.1 and 6-2, identifies the critical capital improvement projects for Marana Water and provides associated cost estimates at the present day's price. The CIP are made based on growth assumptions as of today's conditions. It is important to evaluate growth potential and annual growth so that infrastructure projections can be modified periodically. These projections will dictate the funding xequirements and timing associated with each capital improvement. Project timing and land acquisition has been the critical path of the majority of Marana Water's capital improvements. construction phases of the project, and budgets these phases of implementation accordingly. This extended timeline allows Marana Water to effectively manage its CIP while meeting or exceeding the regulatory standards for the development of required infrastructure. 7.3 SOURCE, STORAGE, AND BOOSTER CAPACITY EVALUATION Marana Water evaluates its source, storage, and booster capacity requirements continuously to closely monitor its system capacities required for the capital improvements, to ensure these capacities continue to meet the established standards for the system, and to identify the most effective locations to place proposed facilities. Three tables have been developed to provide an annual evaluation of the source, storage, and booster capacities as shown in Table 7.1: Marana Water Master Plan Source Capacity Worksheet, Table 7-2: Manna Water Master Pian Storage Capacity Worksheet, and Table 7-3: Marana Water Master Plan Booster Capacity Worksheet. "Tables 7.1, 7.2, and 7.3 have been removed for security purposes under the Public Health Security and Bioterrorism Preparedness Response Act." Historically, it has taken Marana Water approximately one year to design, bid, ,and select a contractor to construct a project. Coupled with increased regulatory requirements associated with the environmental impacts of projects and land acquisition, as much as a two to five year timeframe is anticipated for design. Marana Water typically sets the capital improvements implementation schedule in two to three year increments far its most substantial projects, in terms of land acquisition, environmental and cultural resource clearances, Storrnwater Pollution Prevention Plan (SWPPP) development and implementation, and design and Town of Marana Potable Water System Master Plan __.~ ~Y.. ~. _ __.__.._ ,. ..w ....:,.~ 8/31/2010 DRAFT CHAPTER 7: IMPLEMENTATION Page 7-5 7.4 CONNECTION FEES AND RATES The capital improvements and associated costs indicated in this Master Plan are recommended for use by the utility and its rate consultants in the establishment or update of connection fees to the potable water system. These connection fees are for infrastructure required to serve future growth. Infrastructure required for support of the existing system has historically been funded by rates. There are a variety of ways to calculate the connections fees for a utility system. Marana Water is currently using the EDU system. 7.4.1 Infrastructure Impact Fee The Infrastructure impact fee funds for construction of wells, storage, and booster stations, except those related to gravity storage facilities and distribution. Gravity Storage and Renewable Water Resource Fee 7.4.2 Gravity Storage and Renewable Water Resource Fee The Gravity Storage and Renewable Water Resource fee funds projects relating to Marana Water's gravity storage and distribution, water rights acquisition, and treatment for the buildout water systems. ~p'a N O/ Town of Marana Po#able Water S stem Master Plan ~ _.,~ 1 ~.~~ . ~_._.®. ~~............ ~!. a.. ~.. 8/31I2a10 DRAFT `'^~'~ .aNA / ,;, ~MIT(1N~`