Castle Pines North Metropolitan District Integrated Water Resources Plan Community Meeting No. 1 November 7, 2005

Agenda 1. Introductions 2. What is the Integrated Water Resources Plan? 3. Castle Pines North's Existing Water Supply and Demands 4. The IWRP Process 5. Potential Supply Options 6. Upcoming Project Activities and Community Meetings 7. Questions and Comments

1. Introductions

Background on CDM u A national engineering consulting firm u 3,200 employees with 140 in Denver u focus on water resources engineering u Recently completed Integrated Water Supply Plans for: u Colorado Statewide Water Supply Initiative u San Diego, Los Angeles, Santa Fe, San Antonio

CDM Recent Integrated Water Resources Planning Santa Clara Valley WD IRP Metropolitan Water District IRP City of Los Angeles IRP City of San Diego IRP Colorado Statewide Water Supply Initiative City of Santa Fe IRP San Antonio Watershed Plan BECC (El Paso) Bi-National Water Plan Brazos River Authority IRP Austin Watershed Master Plan South Platte Decision Support System Northern NM Regional Groundwater Model

CDM Recent Water Demand and Conservation Studies Santa Clara Conservation Evaluation MWD Demand Forecast San Diego Demand Forecast & Conservation State of Colorado SWSI Demand Forecast Albuquerque Demand & Conservation Study Phoenix Demand & Conservation Evaluation Las Vegas Demand & Conservation Study El Paso Demand Forecast Kelly AFB Demand Forecast Santa Fe Demand Forecast

2. What is the Integrated Water Resources Plan?

Integrated Water Resources Tasks Evaluate past, current, and future water demand Evaluate water conservation strategies Evaluate long-term sustainability of the District's existing groundwater supply using a groundwater model Evaluate other water supply options and find the optimum "grouping/portfolio" of options that best meets the needs of the community

Critical Tasks for Success u Assess current and future water demands u Evaluate potential additional conservation measures u Evaluate sustainability of existing groundwater supply u Develop plan for efficient use of existing wells and groundwater u Use proven alternatives analysis methods u Evaluate potential sources of renewable water supply u Explore partnering opportunities u Develop a practical timetable for bringing on renewable water supplies u Implement a successful public outreach program

Schedule Task 1 – Future Water Demand Projections Task 2 – Water Conservation Strategies Task 3 – Groundwater Sustainability Analysis Task 4 – Prepare the Integrated Water Resources Plan Community Involvement SepOctNovDecJanFebMarApr Community Meeting Dates

3. Castle Pines North's Water Supply and Current Demands

Existing Supply u Groundwater is currently CPN's only source of water supply u CPN's existing groundwater supply is nonrenewable u Groundwater is not "running out" but it will cost more in the future if groundwater levels continue to decline u More wells, more energy needed to pump water at deeper levels, reduction in well yield, and higher maintenance costs

CPNMD Denver Basin Aquifers Dawson Denver Arapahoe Laramie-Fox Hills Alluvial

South-North Cross-section through CPNMD NorthSouth Dawson Denver Arapahoe L-FH Castle Pines North Denver Greeley

Laramie-Fox Hills Arapah oe Denver Dawson Castle Pines North West East West-East Cross-section through CPNMD

Next project step: complete groundwater analysis Task 1 – Future Water Demand Projections Task 2 – Water Conservation Strategies Task 3 – Groundwater Sustainability Analysis Task 4 – Prepare the Integrated Water Resources Plan Community Involvement SepOctNovDecJanFebMarApr Community Meeting Dates

CPN Monthly Water Demands Summer Demands > 6x Winter Demands

Historic and Projected CPNMD Water Demands

Current CPNMD Water Demands by Customer Type Residential use assumes watering every 3 days Total 2005 Demand = 1,897 acre-feet

Breakdown of Typical Residential Water Use* *AWWA Residential End Use Study

Regional Water Demands Counties GPCD 2000 Per Capita Demands

The bottom line on our supply and demand u CPN is nearing buildout, so future demands can be predicted u Groundwater is not "running out" but it will cost more in the future u Regional issue affecting Douglas and Arapahoe Counties. u IWRP to plan for the future

4. The IWRP Process

The IWRP Challenge u Existing situation u Non-renewable groundwater supplies u Declining water levels in area u Increasing costs to maintain yields u Make efficient use of groundwater resources u Drought reserve u Extend life of aquifers u Implement conjunctive use u Incorporate renewable supply options (surface water) u Competition of limited resources u Expensive u Difficult to go it alone

Defining the Gap Year Demand (AF/YR) Demand Gap Existing Reliable Supplies Water Demand

Sustainability Definition – Context for Evaluating Water Supply Options u The CPNMD Board and Staff suggest sustainability be "no net long-term drawdown" in aquifer water levels u This means that aquifer water levels can fluctuate based on demands and availability of renewable supplies

Focus First On Objectives Objectives Performance Measures Complete Alternatives Options Models/ Tools Preferred Strategy "Why""How" Surface water storageSurface water storage More conservationMore conservation Conjunctive useConjunctive use Water treatmentWater treatment Provide reliabilityProvide reliability Cost effectivenessCost effectiveness Water QualityWater Quality

Alternatives Development & Evaluation Process Show trade-offs between alternativesShow trade-offs between alternatives Identify common elements & phase-inIdentify common elements & phase-in Develop implementation strategyDevelop implementation strategy Evaluate Supply Alternatives Establishes goalsEstablishes goals Helps define criteria for which alternatives will be comparedHelps define criteria for which alternatives will be compared Define Objectives Identify all feasible supply and demand- management optionsIdentify all feasible supply and demand- management options Rank options & combine into alternativesRank options & combine into alternatives Build Supply Alternatives Identify stakeholdersIdentify stakeholders Identify and incorporate "risk" into decision makingIdentify and incorporate "risk" into decision making Evaluate partnering opportunitiesEvaluate partnering opportunities Develop Evaluation Framework

Objectives ObjectiveDescription Manage costsCost of construction, O&M; likelihood of outside funding Improve reliabilityMinimize risks of shortage; local control of supply Long-term sustainabilitySustainable use of groundwater resources Technical implementabilityLikelihood of supply development, quality of supply, and compatibility with existing water system Protect the environmentProtection of land and water habitats, cultural and social resources, and aesthetic resources AcceptabilityPolitical, institutional, &regulatory acceptability; permitting Timely implementationAbility to implement solutions by the time they are needed Maintain acceptable quality of life Maintain quality of life with respect to green spaces, etc. Water qualityProvide treated water quality that meets or exceeds standards and its taste is aesthetically pleasing

The IWRP will build integrated alternatives Surface water Ground- water Ag Transfers ReuseStorage Conser- vation Surface water Ground- water Storage Reuse. Conserv. Portfolio 1 Ground- water Storage Reuse Conserv. Portfolio 2 Ground- water Storage Reuse Conserv. Portfolio 3 Ag Transfers Projected Demand

5. Potential Supply Options

Conservation: Current Measures u Water Restrictions u 2003 – began watering limited to every 3rd day. u Balances system demands and reduces peak day. u Water Rates u Historically a tiered system u 2004 – began budget water based on lot size and a 4-5 tiered block rate system based on usage u Rebates for Retrofits u Program began in 2003 u Public Education u Formal process began in 2003

Castle Pines North Rebate Program ItemBenefit/SavingsRebate Rain SensorsOverrides irrigation system by detecting rainfall $100 (Limit one per household) Programmable Irrigation Clock Sets time limits to help conserve water $75 (Limit one per household) Low Flow ToiletsUses 1.6 gallons per flush; Old toilets use three to five gallons per flush $100 (Limit three per household) Front Loading Washing Machines Uses 20 gallons per load; Horizontal machines use 45 gallons per load $125 Hot Water Recirculation System (began 2005) Delivers hot water to fixtures quickly$100 (Limit one per household) Tankless Hot Water Heaters (not sure when began) Only heats water as it is used$100 (Limit one per household) *Source: CPN Website

Conservation Potential u Indoor Conservation Potential u Limited - mostly for newer homes u Up to approx 100 AF/Yr for residential u Total Commercial use <5% of build-out demand u Residential Outdoor Conservation Potential u Rate structure & budget allocation provide incentives for efficiency u Rate structure can potentially be optimized for additional savings u Additional savings likely through permanent landscape changes u Open Space Irrigation Conservation Potential u Additional savings likely through permanent landscape changes

Potential Sources of Renewable Supplies Colorado River Basin Transbasin deliveries from Upper Blue River to Upper South Platte with Combined Storage and Pipeline Upper Arkansas River Water rts acquisition with storage and pipeline to Upper South Platte Drainage Upper South Platte Basin Water rts acquisition with storage and pipeline Lower Arkansas River Basin Fallowing and water rts acquisition with storage and pipeline Lower South Platte Fallowing program and water rts acquisition, gravel pit storage and pipeline Upper Cherry Ck and Plum Ck Water rts acquisition with storage & pipeline Rueter-Hess Reservoir

310,000 4,500,000 1,530, , ,000 1,780, , , , ,000 YAMPA WHITE COLORADO GUNNISON DOLORES SAN JUAN ARKANSAS SOUTH PLATTE N. PLATTE LARAMIE RIO GRANDE WEST SLOPE Irrigated Acres: 880,000 EAST SLOPE Irrigated Acres: 2,270,000 Year 2000 Statewide Flows and Irrigated Acres

State of Colorado Year 2000 Agricultural, M&I and Self-supplied Industrial Water Demands West Slope East Slope

Example of Combined Surface and Ground Water Use for CPNMD Future Demand Current Demand PRODUCTION GW CurrentAverage Wet Year Dry Year GW SW CONDITIONS GW SW GW SW SW Sources GW from recharge Non-renewable GW Recharge to GW

Storage: Chatfield, Rueter-Hess

6. Upcoming IWRP Project Activities and Community Meetings

Schedule Task 1 – Future Water Demand Projections Task 2 – Water Conservation Strategies Task 3 – Groundwater Sustainability Analysis Task 4 – Prepare the Integrated Water Resources Plan Community Involvement SepOctNovDecJanFebMarApr Community Meeting Dates

Content & Objectives of Each Community Meeting u Meeting No. 1 – November 7, 2005 u Introduce IWRP u Overview of supply and demands u Meeting No. 2 – January 23, 2006 u Provide results of groundwater analysis u Present preliminary alternatives u Meeting No. 3 – March - April 2006 u Present IWRP u Discuss recommended alternatives

For additional information or to provide comments: Contact: Contact: Castle Pines North Metro District James McGrady, District Manager , ext. 11 Visit: the CPNMD web site

7. Questions, Comments, Input?