2010 water resources master plan update

2010 Water Resources

Prepared by

Castle Rock Water Engineering

March 2011

Master Plan Update

Draft Water Master Plan 2010 Update Water Resources Master Plan 2010 Update

Table of Contents

1. Introduction ..................................................................................................... 1

2. Current Regional Efforts .................................................................................. 2

South Metro Water Supply Authority (South Metro) ................................... 2

Water Infrastructure and Supply Efficiency (WISE) Partnership ................ 2

2010—WISE Partnership Water Delivery Agreement ................................ 3

2010 Regional Water Supply Master Plan ................................................. 3

Douglas County Water Resources Authority.............................................. 4

3. Summary of Completed Projects..................................................................... 5

WRIP Implementation Actions Status ........................................................ 5

4. Master Plan Elements ................................................................................... 10

Implement a Water Master Plan .............................................................. 10

Landscape Regulations & Principles ....................................................... 10

Conservation Rebates ............................................................................. 11

Water Budget ........................................................................................... 11

Conservation Education ........................................................................... 11

Landscape Retrofit Projects ..................................................................... 11

Fully Develop Town’s Water Rights ......................................................... 11

Regional Cooperation .............................................................................. 12

Develop Reservoir Storage ...................................................................... 12

Groundwater Optimization ....................................................................... 13

Financial Plan .......................................................................................... 13

5. Capital Improvement Program ...................................................................... 14

Castle Rock CIP ...................................................................................... 14

WISE Long Term Implementation CIP ..................................................... 14

WISE Immediate Implementation CIP ..................................................... 14

Aquifer Storage and Recovery ................................................................. 15

Chatfield Reallocation .............................................................................. 16

Potable Water Pipeline and Pump Station from Reuter-Hess Reservoir . 16

Infrastructure Share with Parker WSD ..................................................... 16

Denver Spot Water .................................................................................. 16

Regional Water Treatment Facility ........................................................... 17


Chambers Road Pipeline and Pump Station ............................................ 17

Plum Creek Diversion Structure ............................................................... 17

Diversion Structure Raw Water Pipeline and Pump Station ..................... 18

Plum Creek Water Purification Facility Expansion ................................... 18

ECCV Northern and Western Pipelines ................................................... 18

ECCV Northern Treatment and Pump Stations ....................................... 19

Water Rights Acquisition .......................................................................... 19

Financing ............................................................................................................ 23

Water Resources Fund User Charge Revenue Requirements ................ 23

Proposed Water Resources SDF Implementation Schedule ................... 24

References ......................................................................................................... 25


Table 3-1: 2008 WRIP Implementation Actions Status ........................................ 5

Table 4-1: Distribution of Water Supply Sources ................................................ 12

Table 6-1: Water Resources Fund User Charge Revenue Requirements ......... 23

Table 6-2: Proposed Water Resources SDF Implementation Schedule ............. 24

Table 6-3: Current Monthly Water Resources Charge…………………………….24

Figure 1 Overall Implementation Plan for WISE Program ................................ 20

Figure 2 Implementation Plan Phase 1 — 2011 through 2015 ........................ 21

Figure 3 Implementation Plan Phase 2 — 2016 through 2020 ........................ 22

List of Tables

List of Figures


Appendix A: Castle Rock Capital Improvements Program

Appendix B: WISE Long Term Implementation CIP

Appendix C: WISE Immediate Implementation CIP

Appendices


Preparation of

the Updates

The Town of Castle Rock wishes to acknowledge those who contributed to the

preparation of the Stormwater, Wastewater, Water, and Water Resources Master Plan Updates.

Town of Castle Rock

Caryn Ashbay Mapping Specialist - Utilities

Bryan Baker Program Analyst - Water Resources

Heather Beasley, PE Engineering - Water Resources Engineer

Preston Clark Engineering - Plan Review

Tim Friday, PE Engineering Manager - CIP

Matt Hayes, PE Engineering - Project Manager

Dave Hoagland Line Maintenance Supervisor

Martin Hudson Long Range Project Manager - Development Services

Richard Krulish, PE Engineering - Plan Review

Tim Lambert Utilities Superintendent

Donna Martin Senior Office Assistant

Ray Olson Operations Manager

Ron Redd, PE Director, Utilities

Jason Reynolds Project Manager - Development Services

Carolyn Richards Administrative Assistant

Jeanne Stevens, PE Engineering - Project Manager

Gordon Tye SCADA Network Analyst

David Van Dellen, PE Engineering - Project Manager

Pieter Van Ry, PE Engineering Manager- Stormwater

Rick Wilkey, PE Asst. Director, Utilities

Deborah Yerovsek Enterprise Fund Analyst

The Town of Castle Rock Utilities Commission

Consultant Support for Rates and Fees Analysis

Carol Malesky Red Oak Consulting

Fernando Aranda Red Oak Consulting

In addition, the Town would like to thank all those who provided a review of the draft Master Plan Updates.

i


Definitions and Acronyms

AC Acre

ADD Average Day Demand (water)

ADF AverageDaily Flow (wastewater)

AF acre-feet

AF/YR Acre-Feet per Year

ASR Aquifer Storage and Recovery

AWWA American Water Works Association

CCTV Closed Circuit Televising

CDM Camp Dresser & McKee

CDPHE Colorado Department of Public Health and Environment

CIP Capital Improvement Project

CMOM Capacity, Management, Operations, and Maintenance

COS Cost of Service

CWCB Colorado Water Conservation Board

DCWRA Douglas County Water Resources Authority

DIP Ductile Iron Pipe

ECCV East Cherry Creek Valley Water and Sanitation District

EIS Environmental Impact Statement

EPA Environmental Protection Agency

FF Fire Flow

FT Feet

FPS Feet Per Second

FTE Full-time Equivalent

GASB34 Governmental Accounting Standards Board Statement 34

GESC Grading, Erosion, and Sedimentation Control

GIS Geographic Information System

GPCD/gpcd Gallons per Capita per Day

GPD Gallons per Day

GPM Gallons per Minute

IGA Intergovernmental Agreement

I/I Infiltration and Inflow

in, In Inch

Lf, LF linear feet

LIRF Lawn Irrigation Return Flows

MDD Maximum Day Demand

mg Milligrams

MG Million Gallons

MGD Million Gallons per Day

N/A Not applicable

ii


O&M Operation and Maintenance

PC Plum Creek

PCWA Plum Creek Wastewater Authority

PCWPF Plum Creek Water Purification Facility

PDF Peak Design Flow or Portable Document Format

PF Peaking Factor

PHD Peak Hour Demand

PRV Pressure Reducing Valve

PS Pump Station

PSI Pounds per Square Inch

PVC Polyvinyl Chloride (a common pipe material)

PWP Prairie Waters Project

PWSD Parker Water and Sanitation District

RCNLD Replacement Cost New Less Depreciation

RCP Reinforced Concrete Pipe

RHR Rueter-Hess Reservoir

RO Reverse Osmosis

ROW Right-of-Way

RRWSP Reclamation Rural Water Supply Program

SCADA Supervisory Control and Data Acquisition

SDFs System Development Fees

SewerCad Sanitary Sewer System Model Software

sf, SF Square foot

SFE Single family equivalent

SMWSA South Metro Water Supply Authority

SSO Sanitary sewer overflows

SWMP Stormwater Master Plan

TM Technical memorandum

Town Town of Castle Rock

USBR United States Bureau of Reclamation

USEPA United States Environmental Protection Agency

WISE Water Infrastructure and Supply Efficiency

WRIP Water Resources Implementation Plan

WRSMP Water Resources Strategic Master Plan

WSD Water and Sanitation District

WSS Water Supply Strategy

WTF Water Treatment Facility

WTP Water Treatment Plant

WW Wastewater

WWMP Wastewater Master Plan

WWTP Wastewater Treatment Plant

yr, YR Year

iii

Water Resources Master Plan 2010 Update

1

1. Introduction

This 2010 Water Resources Master Plan Update provides a summary of the Town’s re-gional involvement, a review of the major plan assumptions, an update on the progress of the implementation actions outlined by prior plans, a list of current capital improve-ment projects, and the means by which the Town plans to fund the improvements.

In 2006, the Town prepared a Water Resources Strategic Master Plan (WRSMP) that documented the preferred water supply strategy and the water supply alternatives to at-tain a 75% sustainable water supply portfolio by buildout.

Preferred Water Supply Strategy (WSS)

The preferred WSS consists of implementing the following activities:

Implement a water conservation plan;

Fully develop and use Town’s current water rights;

Make full use of the water rights from reclaimable water the Town has rights to;

Work in partnership with other South Metro providers to import surface water to reach an overall water supply mix of renewable and reusable water that is 75% sustainable;

Develop reservoir storage to maximize efficient management of water supply;

Continue to maintain and develop the Town’s Denver Basin groundwater supply to meet the demands of continuing growth in the short term, and provide reliability and a smaller supply role in the long term; and

Develop a financing plan to generate the capital funds required for transitioning to a sustainable supply.

The preferred WSS incorporates a number of different water sources and associated infrastructure and has remained constant since the writing of the 2006 WRSMP. The most changes have occurred not in the water supply strategy, but in how the Town im-plements the strategy, and these changes are due to significant advances in regional cooperation. There are several different options on how to deliver renewable water to the Town. This update focuses on the three most viable options and details the costs and timing for each.

This water resources master plan update is intended to adjust prior plan assumptions and project implementations based on current regional advances. For more detailed in-formation regarding the Town’s existing water portfolio please refer to the 2006 Water Resources Strategic Master Plan and the 2008 Water Resources Implementation Plan


2

2. Current Regional Efforts

South Metro Water Supply Authority (South Metro)

South Metro, formed in 2004, is an organization comprised of 15 individual water provid-ers in Douglas and Arapahoe counties that work collaboratively to foster long-term water supplies through water acquisition and infrastructure development. By taking a unified approach to regional water rights, South Metro garnishes increased negotiating power and has positioned itself to cooperate with the state’s largest water providers.

Town staff also participates in a South Metro subgroup called the SMWSA Groundwater Group, which meets periodically for the purpose of jointly managing the pumping of the deep groundwater aquifers in the south-central region of the Denver Basin. Some of the accomplishments of the group include:

Developing a GIS database with well information such as well locations, aquifer prop-erties, pump test data, cost data, etc. from all the participants;

Sharing well operational strategies and an inventorying of well pumping data, and aquifer water level data among participating members;

Conducting a Regional Aquifer Supply Assessment utilizing funds from a Colorado Water Conservation Board (CWCB) Water Supply Reserve Grant; and

Initiating an Aquifer Recharge Pilot Study to evaluate whether the aquifers in the South Metro region are a viable water storage option. This project is also being fund-ed through a grant from the CWCB.

The SMSWA Groundwater Group continues to be a useful forum for member engineers and hydrologists to share knowledge, and discuss issues regarding the Denver Basin Aquifers.

Water Infrastructure and Supply Efficiency (WISE) Partnership

In 2008, Denver Water and Aurora Water initiated detailed evaluations of using their in-dividual water resources and infrastructure collaboratively to meet each of their long-term water supply needs. Through those investigations, the potential for supplies to be made available intermittently to South Metro was identified. The extension of this original collaboration resulted in what is now known as the WISE Partnership. In July 2009, Aurora Water, Denver Water, and South Metro entered into an intergovernmental agreement (IGA) that enabled them to cooperatively identify and potentially develop efficient and cost-effective ways to address long-term water supply needs of the South Denver Metro area. The IGA created a mechanism by which the three entities could potentially identify, share, and acquire certain infrastructure, water rights, and other assets that will be mutually beneficial. The IGA defines a portion of the lower South Platte River basin as a “project region” – the South Platte River just down-stream of Chatfield Reservoir to Balzac, Colorado - and any infrastructure acquisitions or


3

improvements to move that water around. The parties have agreed to jointly investigate acquisition opportunities that may arise and not to pursue acquisitions within the project region individually without first offering participation to the entire group. The term of the IGA is three years and is set to expire summer 2012. Some of the potential benefits of this IGA to the Town are:

Increases efficient use of available water resources.

Produces greater benefit than individual actions at less cost to allow more cost- effective use of customers’ dollars.

Increases the efficient use of infrastructure and reduces duplication.

Relies largely on water already available in the Aurora and Denver systems and thereby reduces the near term need to develop additional sources.

Offers a responsible, orderly approach for the acquisition or leasing of agricultural water that is needed for urban purposes.

2010 – WISE Partnership Water Delivery Agreement

More than a year’s worth of combined engineering investigations have identified a fully integrated water project that could meet a majority of the South Metro’s long-term water supply needs. That project is based largely on the utilization of available Denver Water and Aurora Water reusable return flows available in the South Platte River downstream of Denver and excess capacity in Aurora’s Prairie Waters Project (PWP) Phase I. The PWP project includes a water diversion “north campus” along the South Platte River close to Brighton, three pump stations, and over 30 miles of pipeline to convey the water from the north campus to the new Peter Binney Water Purification Facility located adjacent to the Aurora Reservoir (See Figure 1). Initial planning work indicates that Aurora Water would only need the full capacity of the PWP system in the peak summer demand periods two of every ten years (drought years). In drought years, Denver could benefit from an ability to recapture its reusable return flows through existing regional infrastructure rather than independently constructing Denver Water infrastructure to infrequently or intermittently access those resources. Currently, the partners are negotiating a Water Delivery Agreement that could make available at least 10,000 acre-feet (AF) per year to the South Metro as early as 2012 and up to 40,000 AF per year if certain significant infrastructure investments are made by the South Metro. Please refer to the South Metro Water Supply Authority 2010 Regional Water Supply Master Plan Update for more information regarding the necessary infrastructure and associated costs to implement the WISE Partnership project.

2010 Regional Water Supply Master Plan

This report builds upon and updates the South Metro’s previous 2007 Master Plan (CDM, 2007) focused on near and mid-term efforts to implement renewable supplies through regional partnerships. This 2010 Plan considers the potential integration and utilization of supplies from the WISE Partnership. The utilization of WISE supplies to address the South Metro’s members’ renewable water supply goals is evaluated along with updating the original focus on middle South Platte River agricultural rights that would be delivered through the ECCV Northern Water Supply system. The report is still in draft and is contract controlled for use only by WISE partners.


4

Douglas County Water Resources Authority

Douglas County Water Resources Authority (DCWRA) was formed in 1992, and is com-prised of nineteen members in Douglas and Arapahoe Counties. DCWRA addresses water resource conservation, water education, and public policy surrounding water issues.

DCWRA has successfully completed an appraisal study for a regional watershed based infrastructure project under the Reclamation Rural Water Supply Program (RRWSP), and will be submitting a feasibility study grant proposal for consideration by US Bureau of Reclamation (USBR). If successful, DCWRA contemplates entering into a cost sharing arrangement with USBR to complete a feasibility study of how to supply the rural parts of Douglas County with municipal water. Additional funding for the feasibility study has been obtained in the form of a grant award for $600,000 from the Colorado Water Conservation Board (CWCB). An intergovernmental agreement (IGA) has been signed by DCWRA, South Metro Water Supply Authority, the Rural Water Authority of Douglas County, and Douglas County government to investigate if and how the USBR program can be applied to the water issues facing the Douglas County region.


5

3. Summary of Completed Projects

In 2008, CDM prepared for the Town, Castle Pines Metropolitan District, and Castle Pines North Metro District a Water Resources Implementation Plan (WRIP). This plan detailed a phased approach to implementing the over-arching goal of the 2006 Water Resources Strategic Master Plan of a 75% renewable and 25% non-renewable water supply. The WRIP documents the plan for development and use of the local renewable supplies and the recommended approach to integrating imported renewable water with those local supplies. The result was a phased capital investment plan that would bring renewable supplies from both the northern regional source and the local Plum Creek and return flows to dramatically increase the sustainability of the Town’s water supply portfo-lio. Table 3-1 below shows the original plan implementation actions and the status of those actions as of the writing of this Plan update.

TABLE 3-1 2008 WRIP Implementation Actions Status

Phase Action Status Actual

Cost

Phase 1

Original

Time Frame

2007- 2012

Negotiate with ECCV for

Firm and Variable capaci-

ty in Northern and West-

ern pipelines

The Town negotiated and purchased 1.4 mgd of

Firm capacity in the Northern pipeline. Further

negotiations are on hold as the WISE Project

takes shape. If the Town participates in the WISE

project, there will be no need to purchase any ad-

ditional capacity in the Northern pipeline. The

ECCV Western line is part of the infrastructure

included in the WISE Project.

$1,400,000

Negotiate with ECCV for

Firm and Variable capaci-

ty in the Northern WTP

and booster pump sta-

tions and participate in

design for Town-owned

capacity

The Town is not participating in the design and

construction of ECCV’s Northern WTP and boost-

er pump stations. This investment is on hold

pending the outcome of the WISE Project.

Identify near-term meth-

od to convey raw water to

ECCV WTP

Pending the outcome of the WISE Project.

Purchase Storage Ca-

pacity in Rueter-Hess

Reservoir

The Town has purchased 8,000 acre-feet of stor-

age in 2008.

$45,000,000


6

Secure Rights-of-Ways

for Chambers Road

pipeline and pump sta-

tion to Rueter-Hess

Reservoir from ECCV

Western pipeline

The Chambers Road pipeline design is complete

to 30%. Rights-of-Ways from the Western pipe-

line at E-470 south along Chambers Road to the

West side of RHR have been secured.

Purchase Chatfield Re-

allocation Storage

The Town is a participant in the Chatfield Reallo-

cation Project and has rights to purchase almost

1,500 acre-feet. The draft EIS has been issued

to participants for comments and will be submit-

ted to the US Army Corps of Engineers for ap-

proval summer 2011.


for pipelines and pump

station from Rueter-

Hess Reservoir to Town

As part of the WRIP, Appendix D details the rec-

ommended pipeline routing from RHR to Ray

Waterman Regional Water Treatment Center.

Since that WRIP was published, the plan is now

to align a treated water pipeline from the Region-

al WTP at RHR to the Town’s existing Tank 14

on the north end of town. Currently no ROWs

have been secured.

Confirm location and

secure location for new

Regional WTP

CDM completed for the Town a DRAFT Tech-

nical Memorandum No. 1 – Preliminary Water

Treatment Plant Siting Analysis. The Town con-

tacted land owners of the recommended site and

has been unable to purchase the property for the

WTP site. This effort is currently on hold pend-

ing the outcome of the WISE Water Delivery

agreement. Other options include working with

Parker Water and Sanitation District or using the

Ray Waterman Regional Water Treatment Plant.

Construct Centennial

WSD

Interconnection

Town negotiated with Centennial WSD to divert,

treat and deliver its reusable effluent back to the

Town, however no agreement was reached. The

Town instead is implementing a project to cap-

ture this water supply locally.


for pipeline and pump

station from Plum Creek

alluvial well fields to

Plum Creek Reservoir

site.

As part of the Legacy Projects, three alluvial well

fields are planned along Plum Creek in the next

few years or the first phase of the project – north,

central, and south. Currently, staff is preparing

preferred alignments and preliminary design for

pipelines from the central and south Plum Creek

alluvial well fields to the new PC Water Purifica-

tion Facility


7


for pipeline and pump

station from Plum Creek

Reservoir to Regional

WTP.

The Plum Creek Water Purification Facility Pro-

ject has replaced the plan to pump Plum Creek

water rights to RHR.

Initiate acquisition of

South Platte water rights

The Town, through the South Metro, is a partici-

pant in the WISE Partnership. This partnership

provides a mechanism for Denver Water, Aurora

Water, and South Metro to collectively investi-

gate water rights acquisition opportunities

(among other things) in the middle South Platte

River. The Partnership is currently developing

an agreement to purchase some water rights

jointly.

Form Plum Creek Water

Authority Initial negotiations took place, however the Au-

thority was never formed. No further action is

anticipated.

Connect Town golf

courses to existing allu-

vial wells

This action has been replaced with the Renewa-

ble Water Project and alluvial wells will send

Plum Creek water rights to the new Plum Creek

Water Purification Facility

Aquifer Storage and Re-

covery Testing

CDM completed for the Town the Phase 1 Feasi-

bility Evaluation for the Aquifer Storage & Recov-

ery Pilot Testing Program in November 2009.

Phase II of the pilot testing program can be initi-

ated once renewable water is inserted into the

Towns water supply.

Plum Creek alluvial well

production and water

quality investigation.

CDM has completed for the Town the E. Plum

Creek Alluvial Well Field Feasibility Study for the

PC North Well Field. CDM is contracted to per-

form the same type of study on the PC Central

Well Field and will begin that investigation once

landowner approval has been received. A simi-

lar investigation is scheduled for Nov/Dec 2010

at the PC South Well Field.


8

Original

Time Frame

20013- 2017

Participate in construction

of ECCV Water Treat-

ment Plant and booster

pump station for Town-

owned capacity

Dependent on the WISE Project.

Construct treated water

pipeline from Smoky Hill

Road to Regional WTP


Design and construct

Plum Creek Reservoir

and surface diversion

Deere & Ault completed for the Town a Feasibil-

ity Study for the Plum Creek Reservoir. The

analysis showed the storage to be expensive

and the construction and permitting difficult. The

Town may investigate a diversion structure fur-

ther downstream in Sedalia where the conflu-

ence of East and West Plum Creek provide ad-

vantages to exercising the Town’s water rights

and storage is more feasible.

Construct treated water

pipeline to Ray Water-

man Regional

Water Treatment Center

Plan is to now construct a treated water pipeline

to the Town’s existing Tank 14 in the north side

of town.

Phase 3

Original

Time Frame

2018- 2022

Construct North raw wa-

ter conveyance


Design and construct raw

water pipeline and pump

station from RHR to new

Regional WTP

Action still planned, time frame is dependent on

CIP Scenario.


9

Construct new Regional

WTP

Still planned, time frame is dependent on CIP

Scenario.

Construct Plum Creek

alluvial wells and raw wa-

ter pipelines to Plum

Creek Reservoir

Action still planned except the pipelines will feed

the new PC Water Purification Facility. Time

frame is dependent on growth.

Design and construct

pipeline and pump station

from Plum Creek Reser-

voir to Regional WTP.

The Renewable Water project has replaced the

plan to pump Plum Creek water rights to RHR.

Construct Town Re-

claimed Water system

Investigations showed that the construction of a

Reclaimed Water System was not as cost effec-

tive as diverting and treating the reusable efflu-

ent and other Plum Creek rights locally.


10

4. Master Plan Elements

The 2006 Water Resources Strategic Master Plan (Plan) outlined seven overriding goals for the plan (See Section 1 above). All of those goals remain valid in this master plan update. However, some of the details of how to attain those goals have changed.

Implement a Water Conservation Master Plan - In December 2006 the Town

of Castle Rock (Town) adopted a Water Conservation Master Plan (Master Plan). The conservation goals identified in the 2006 Water Conservation Master Plan

include: Reduce current and future water demands – Specifically reduce average water consumption by year 2030 from 165 gallons per capita per day (gpcd) to 135 gallons per capita per day. Only three years after adoption of the Master Plan, the Town’s gpcd consumption is already reduced by over 18%. Create a community culture that includes water conservation Ensure financial stability

The implementation strategies identified in the 2006 Water Conservation Master Plan

include:

Implement landscape regulations for new development that results in efficient use of water, is an aesthetically pleasing landscape, and enhances the type of land use; Implement incentive programs that encourage existing properties to be water

efficient and aesthetically pleasing; Implement rate strategies, such as a water budget rate structure, that reward

efficient water use and discourage water waste; and Implement public education programs that allow the Community to make

conservation a way of life.

Since the adoption of the Master Plan, the Town has implemented all of the strategies listed above with great levels of success and vast community support and participation.

Landscape Regulations & Principles - In July 2003, the Town adopted the Land-scape Regulations & Principles. The plan is currently being updated and will require “water-wise” landscape designs for all nonresiden-tial, residential builders, and multi-family de-velopments. Ultimately, the goal will be to move away from the current three-day water-ing schedule as a demand management tool, and instead encourage smart landscaping

practices that reduce water consumption.


11

Conservation Rebates - Beginning in 2006, the Town implemented three conser-

vation rebates for all qualified Town customers. In June 2009, the Town added three more rebates. The conservation rebates include:

SMART Irrigation Controller

High Efficiency Washer

Three-day programmable Timer

Rotary Nozzle Replacement

Rain Sensor

Smartscape Renovation

Water Budget - In August 2008 the Town transitioned from an inclining block rate

structure to a “water budget” rate system for all non-residential customers. The wa-ter budget rate system for residential customers followed in August 2009.

Conservation Education - Town staff has

developed and administers frequent “Water Wiser” classes for customers concentrating on water conservation practices, maintenance and management of sprinkler systems, and principles of Xeriscape. The Town also maintains several Xeriscape demonstration gardens open to the public with signage to identify plants and care instructions.

Landscape Retrofit Projects - The Town has recently completed 2 different

projects, totaling over $500,000 to retrofit water thirsty median landscaping into water wise Xeriscape designs and efficient irrigation designs. Projects like this are

anticipated to save hundreds of thousands of gallons each irrigation season.

Fully Develop Town’s Water Rights - The Town currently owns approximately

1,400 acre-feet of senior and junior tributary water rights on East and West Plum Creek. The Town also can claim Lawn Irrigation Return Flows (LIRF) that accrue to East Plum Creek and Cherry Creek. At Build-out these LIRFs are anticipated to be 600 acre-feet annual-ly. Lastly, the Town discharges from Plum Creek Wastewater Authority nontributary groundwater that is reusable to extinction. One major Plan el-ement that has changed is the idea of implement-ing a Direct Non-potable (Irrigation) system throughout the town to reclaim the LIRFs and the non-tributary groundwater rights. Currently, the Town plans to implement an Indirect Potable


12

Reuse plan by capturing the reusable groundwater rights, the LIRFs and even the tribu-tary water rights (when in priority) and treating that water at a new surface water treat-ment plant. Table 1 from the 2006 WRSMP has changed to Table 4-1 below.

Table 4-1: Distribution of Water Supply Sources

** Due to the uncertainty associated with some of the Town’s junior water rights, they are not considered as a firm supply.

Participate in Regional Cooperation - South Metro has been instrumental in

developing a renewable water supply for its members that may be imported to help the Town reach an overall water supply mix of renewable and reusable water that is 75% sustainable. Please see Section 2 for more detail on current Regional Efforts.

Develop Reservoir Storage - In 2008 the Town purchased 8,000 acre-feet of

storage in the Rueter-Hess Reservoir. The Town is also active in the Chatfield Real-

Water Source

Water Supply Amount

(acre-feet per year)

2010 2055

Denver Basin Groundwater 6,140 100% 3,850 25%

Town’s Plum Creek Alluvial Rights 1,400 **

Water Reuse Program 5,700 37%

Imported Surface Water 5,850 38%

TOTAL 6,140 100% 15,400 100%


13

location Project (see Section 5) and would be able to store almost 1,500 acre-feet of tributary water in the reservoir if the project is permitted. Also, the Town has complet-ed studies on the feasibility of raw water storage close to or inside the Town along East Plum Creek.

Develop a Groundwater Optimization Program - Realizing that the Town’s

Denver Basin groundwater supply would continue to play a role in the water supply strategy, the Town made a goal to continue to develop and maintain the groundwater supply to meet the de-mands of continuing growth in the short term, and pro-vide reliability and a peaking supply role in the long term. Currently, the focus of staff is to develop the re-newable water supplies that will comprise the majority of the water portfolio and to develop ways to sustain the groundwater aquifers. Staff has implemented a plan to use our groundwater wells in a more efficient and sustainable way. The Groundwater Optimization Program seeks to reduce operational costs associated with well pumping, identify inefficiencies in well equip-ment, enhance well performance, and to extend the economic life of the Town’s groundwater resource. Much of this has been accomplished through a rigor-ous well monitoring program, which utilizes the Town’s Supervisory Control and Data Acquisition (SCADA) system. Stored data can be extracted and analyzed to look for trends, identify operational inefficiencies, en-hance well performance, and reduce pumping costs through electricity savings. Currently, the Town is implementing a wellhead metering improvement project that will improve the accuracy of our water rights accounting. This will translate into higher efficiency in reclaiming water on Plum Creek.

Prepare a Financial Plan - The last goal identified in the Plan was to develop a

financing plan to generate the capital funds required for transitioning to a sustainable water supply. Transitioning the Town’s water supply from 100% non-renewable to a 25%-75% split of non-renewable to renewable supply continues to be a monumental task, and one that will require large capital investments. The Utilities Department re-cently completed the 2010 Utilities Rates and Fees Study. This plan takes into ac-count the anticipated improvements that will need to be made to implement the long-term water plan as outlined on the Water Resources Capital Improvements Plan (see Section 5). In 2011, a property tax to finance long-term water programs will be con-sidered.


14

5. Capital Improvement Program

Below are descriptions of all the water resources capital improvements identified in this master planning effort including a brief description and the total cost expenditure for the given planning period. Cost estimates are based on 2010 dollars and were developed based on previous projects completed within the Town in the previous 5 years. These estimates are assumed to be accurate to plus 50% to minus 30% of the expected actual cost.

The renewable water component of the long-term water plan is highly variable subject to regional efforts. For this update to the Plan, three different CIP scenarios are envi-sioned and described below.

Castle Rock CIP - The Castle Rock CIP assumes that the Town is not involved in

any regional effort to import renewable supplies and, therefore, must invest capital into purchasing water rights and sole facilities to move the water from the source into the Town.

WISE Long Term Implementation CIP - The WISE Long Term Implementation

CIP assumes that the Town is a participant in the WISE Water Delivery Agreement and is guaranteed renewable water intermittently from Aurora Water and Denver Wa-ter. The WISE water will be treated and delivered to the South Metro members for distribution or storage from ECCV’s Western pipeline at Chambers Road. The Town, over the next several decades, will install the infrastructure to move the water from the delivery point into storage at Rueter-Hess Reservoir and further south for distri-bution within the Town.

WISE Immediate Implementation CIP - The WISE Immediate Implementation

CIP assumes that the Town is a participant in the WISE Water Delivery Agreement and builds all infrastructure necessary to move the water from the delivery point into storage and to the Town by 2016. This CIP assumes funding from a property tax as-sessment.

All projects included in the CIP are detailed below. Projects planned in the Phase 1-2011 to 2015 horizon are shown on Figure 2 and projects planned in the Phase 2- 2016 to 2020 horizon are shown on Figure 3. Projects that are particular to a specific scenario are denoted as such.

One project shown on the CIP Phases Figure 2 and Figure 3 that is not included in the descriptions below is the Plum Creek Water Purification Facility and associated Plum Creek alluvial well fields and raw water transmission pipelines. This project was appro-priated in the 2010 budget but was not envisioned in the 2006 WRSMP or listed in the 2008 WRIP. This project was developed subsequent to the program shift from Direct Non-Potable Reuse to Indirect Potable Reuse of the Town’s Plum Creek supplies. Efforts were made to negotiate with Centennial Water and Sanitation District to have the Town’s reusable effluent captured, treated and delivered to a proposed interconnect pipeline through Centennial’s existing infrastructure. However, the Town’s preference is


15

to capture, treat and distribute those water supplies locally. The overall project consists of several components:

New Plum Creek Water Purification Facility; Development of new alluvial well fields; Redevelopment of existing alluvial well fields; and Raw water pipelines from the well fields to the treatment plant.

This project was budgeted for $22.6 Million and is currently in the design phase. This project is planned to be complete and online by mid 2013.

Aquifer Storage and Recovery (ASR) The Town conducted an assessment of the potential role and feasibility of an ASR program to help address the Town’s future water needs. It is anticipated that ASR could provide local storage to capture renewable water supplies when they are available, for use during times of peak demand. Phase II of the Feasibility Evaluation will include retrofitting an existing well for ASR operations and performing a pilot test. It will also evaluate implementation of the ASR on a Town-wide scale. $400,000 is budgeted for the 2011 to 2015 horizon for the Phase II Feasibility Evaluation. $500,000 is budgeted for the 2016 to 2020 horizon for the retrofit of several existing wells to a dual use – water production and storage.


16

Chatfield Reallocation

This project plans to reallocate capacity in the Chatfield Reservoir from flood storage to water supply storage. The reallocated storage space would be filled using existing water rights belonging to a consortium of water providers. Currently, the Town has rights to purchase approximately 1,500 acre-feet of stor-age. Through evaluation of the Town’s current tributary water rights in Plum Creek, it appears that between 700 and 800 acre-feet may provide the most value for the in-vestment. $5.2 Million is budgeted in 2012 and 2013 to secure 800 acre-feet of storage in the reallocated reser-voir.

Potable Water Pipeline and Pump Station from Reuter-Hess Reservoir

This project is a treated water pipeline and pump station from RHR to the Town’s exist-ing Tank 14 on the northern most end of Town. The size of the pipeline is dependent on the CIP scenario. For the Castle Rock CIP and the WISE Long Term Implementation CIP, the first pipeline is planned to be 18 inches in diameter with 5.7 million gallons per day (mgd) capacity. The second pipeline, planned for the 2016 - 2020 horizon will be 30 inches and add an additional 15 mgd of transmission capacity to the system. $4.5 million and $7.5 million is budgeted for the pipelines, respectively. For the WISE Immediate Implementation CIP, the pipeline will be sized for ultimate capacity of 22 mgd at 36 inches in diameter. The pump station will be constructed in phases for all CIP scenarios. As growth occurs, more pumps will be added to the already constructed pump house. The first phase, planned for the 2011 – 2015 horizon, will be sized to pump 5 mgd of treated water and is estimated to cost $3.5 million. An additional 5 mgd will be added in the 2016 -2020 horizon and is budgeted at $1.5 million for the additional pumps. $3.0 million is budgeted in the 2021 – Buildout horizon to bring the pump station to the full 20 mgd capacity.

Infrastructure Share with Parker WSD

Parker Water and Sanitation District (PWSD) has two existing 16-inch waterlines that run south from near the ECCV Western Line to Rueter-Hess Reservoir. The Town is in negotiations to share a portion of the capacity of one of the pipelines during the period when PWSD has excess capacity. Eventually, depending on growth, PWSD will need that capacity and the Town will need to construct the Chambers Road pipeline to get northern water to RHR or the Town. Minimal improvements are anticipated to connect the PWSD 16-inch pipelines to the ECCV Western Pipeline. $100,000 is budgeted for the 2011 – 2015 horizon.

Denver Spot Water (Only applicable to the Castle Rock CIP)

Denver Water occasionally makes available to the Town 100 acre-feet of renewable wa-ter stored in a gravel pit along the South Platte River downstream of Chatfield Reservoir. This water can be used to make releases for out-of-priority pumping on East Plum Creek or can be sold to others that may need it. $30,000 is budgeted each year in the 2011 –


17

2015 horizon in the case that Denver Water makes the water available to the Town.

Regional Water Treatment Facility

Water withdrawn from Rueter-Hess Reservoir will be treated using an advanced treatment process at this planned Regional WTF. The facility will be located near the reservoir outtake. Castle Rock will ultimately need to secure 20 mgd of treatment capacity. For the Castle Rock CIP and the WISE Long Term Implemen-tation CIP, $40 million is budgeted in the 2016 – 2020 horizon to participate in the construction of this Region-al WTF for 10 mgd of capacity. The expansion of the facility, as growth occurs, is planned for the 2021 – Buildout horizon. In the WISE Immedi-ate Implementation CIP, the Regional WTF may be constructed by Castle Rock in the 2011 – 2015 horizon. The facility will be designed and constructed for easy expansion but will only be equipped for 10-mgd treatment capacity. Expansion of this facility is planned in the 2021 – Buildout horizon and is budgeted at an additional $20 million to provide an-other 10 mgd of treatment capacity.

Chambers Road Pipeline and Pump Station

In all CIP scenarios, renewable water will be coming to Castle Rock from the north in the ECCV Western Line and will need to be stored in RHR. This treated water pipeline will be a cooperative effort by a majority of the South Metro members. The pipeline is planned to be 54 inches in diameter and extend over 7 miles from the ECCV Western Line south to the western edge of RHR and discharge into Newlin Gulch. The Town’s cost share is anticipated to be 34% or $17.1 million. This is budgeted in the 2016 – 2020 horizon for the Castle Rock CIP and the WISE Long Term Implementation CIP. However, for the WISE Immediate Implementation CIP, the cost is budgeted for in the 2011 – 2015 horizon.

PWSD has finished final design and will soon begin construction on a 50-mgd advanced water treatment facility that will be using ceramic membrane filters. The Town is in discus-sions with PWSD to utilize some of the excess capacity as it is available until PWSD needs the capacity. This will allow storage, treatment, and delivery of northern water sev-eral years before a Regional WTF will need to be built.

Plum Creek Diversion Structure

At buildout, it is projected that the reusable effluent released from PCWA will be approximately 7 mgd. It is unlikely that the alluvium along East Plum Creek will physically support well fields to extract 7 mgd. Therefore, a surface diversion is necessary to pull all of the Town’s water rights off of the creek closer to buildout. The location of the surface diversion is still being considered along East Plum Creek from just downstream of the PC North Well Field to Sedalia, downstream of the confluence of East and West Plum Creek. Costs for the surface diversion are budgeted in the 2016 – 2020 horizon as $1 million.


18

Diversion Structure Raw Water Pipeline and Pump Station

This raw water pipeline will extend from the diversion structure to existing raw wa-ter piping at the PC North Well Field. The length of the pipeline as well as the size of the pump station is dependent on the loca-tion of the diversion structure. This cost is listed in the 2016 to 2020 horizon and could range from $500,000 to $4.2 million depending on the length. For budgeting purposes, the longest possible stretch has been budgeted at $4.2 million.

Plum Creek Water Purification Fa-cility Expansion

This facility is currently being designed and is planned to be in operation by summer 2013. The first phase of the facility will be able to treat up to 4 mgd. As growth occurs in the Town, the facility will need to be expanded to treat the increasing amount of reusable effluent released to E. Plum Creek. Expansion of this facility from 4 mgd to 10 mgd is budgeted at $12 million in the 2021 to Buildout horizon.

ECCV Northern and Western Pipelines (Only applicable to the Castle Rock CIP)

ECCV designed and constructed the Northern System to meet its long term water needs without terminal storage. Currently, ECCV pumps alluvial groundwater from the Beebe Draw into its Northern system to meet a portion of its needs. The initial phase of construction included a 32-mile, 48-inch diameter pipeline and two booster pump stations each with pumping capacity of 10 mgd. The system was designed to be ex-panded to provide up to 40 mgd. Because ECCV will use the Northern system to meet its peak demands, some excess capacity is available throughout the entire year (Firm Capacity), while most of the excess capacity is available during the winter (Variable Capacity). The Town purchased 1.4 mgd of Firm Capacity in ECCV’s Northern pipeline and would need to purchase the same amount of Firm Capacity in the ECCV Western pipeline to deliver northern water to the Chambers Road pipeline. The Town also plans to purchase an additional 5.25 mgd of Variable Capacity in the Northern and Western pipelines. The funding for this investment ($10.1 million) is already appropriated in the Town’s 2010 budget but an agreement for the capacity has not been executed. This expenditure is dependent on the WISE Water Delivery Agreement currently in progress. If the WISE Water Delivery Agreement is executed, the Town will no longer need to pur-chase extra capacity in either pipeline.


19

ECCV Northern Treatment and Pump Stations (Only applicable to the Cas-tle Rock CIP)

The initial phase of construction of the Northern system did not include a Water Treat-ment Plant. ECCV is able to blend the Northern water with its existing Denver basin aq-uifer supplies to meet water quality regulations. Construction of ECCV’s Northern WTP utilizing reverse osmosis treatment technology is currently underway. The Town would purchase capacity in the Northern WTP and pump stations to match the Firm and Varia-ble capacities purchased in the Northern and Western pipelines. Preliminary cost esti-mates in the 2008 WRIP assumed a zero-liquid-discharge reverse osmosis (RO) plant. The brine disposal method has changed and will now be deep well injected. The Town is budgeting a $21.1 million investment in the Northern WTP and almost $3.0 million for the pump stations for both Firm and Variable capacity. This payment to ECCV is planned for the 2021 to Buildout horizon.

Water Rights Acquisition (Only applica-ble to the Castle Rock CIP)

At buildout, the Town plans to have 5,900 acre-feet of imported renewable water. Funds are budgeted at regular intervals to purchase mid-dle South Platte senior water rights to supply the ECCV Northern WTP. Growth trends, mar-ket conditions, and most importantly, availability will steer the timing of the purchases. The goal is to have 2,500 acre-feet of northern renewable water by 2020. $11 million is budgeted in the 2011 to 2015 planning horizon for 500 acre-feet, and $44 million is budgeted in the 2016 to 2020 planning horizon for an additional 2,000 acre-feet. The remaining $74.8 million for 3,400 acre-feet is budgeted for the 2021 to Buildout horizon. All of this imported water is assumed to be fully consumable and reusable to extinction.

Below are tables and figures illustrating the three Town CIP scenarios. Operations and maintenance costs are also detailed in the tables.


23

6. Financing

As part of its 2010 Utilities Rates and Fees Study, the Town authorized Red Oak to re-view its rates, fixed charges and system development fees (SDFs) for all four utility funds. The purpose of this study was to provide the Town with a thorough review of its rates, charges and SDFs, underlying assumptions, and provide updated rates and fees for 2011 through 2015 to ensure adequate revenues for sustaining the operation. For this study, the capital and operating costs detailed in the Castle Rock CIP were used to develop the updated rates and fees. The study also presents the methodologies applied to the review and analysis of rates, charges and SDFs.

Red Oak developed cost-of-service (COS) based rates for the water and wastewater utilities and user charges for the water resources and stormwater utilities that meet the annual user charge revenue requirements. The basic philosophy behind a COS meth-odology is that utilities should be self-sustaining enterprises that are adequately financed with rates that are based on sound engineering and economic principles. The guidelines of water ratemaking are established by the American Water Works Associa-tion (AWWA) in the Manual M1. As a result of the COS study for the Town, Red Oak developed projected revenue requirements from 2011-2015 that will recover the Town’s revenue requirements for operating expenses and capital improvements associated with the renewable water plan.

Table 6-1 presents the water resources fund user charge revenue requirements for the period 2011 through 2015.

Table 6.1: Water Resources Fund User Charge Revenue Requirements

Item FY2011 FY2012 FY2013 FY2014 FY2015

Operating and

Maintenance $2,245,292 $2,380,091 $6,235,502 $7,592,733 $7,952,085

Debt Service 4,654,203 4,621,931 4,627,948 5,150,701 5,151,564

Transfer to Capital

Fund 0 0 0 6,322,474 0

Changes in Fund

Balance 2,762,701 3,439,240 1,054,661 (7,734,685) 805,863

Total Expenditures $9,662,196 $10,441,263 $11,918,112 $11,331,223 $13,909,513

System Develop-

ment Fee Rev. $3,397,525 $3,842,075 $4,945,955 $4,043,870 $5,534,483

Non-Rate Revenues 273,748 299,398 318,485 293,931 268,804

Revenues Required

from Rates $5,990,922 $6,299,791 $6,653,672 $6,993,422 $8,106,226


24

Meter Size Hydraulic Capacity

(gpm)

Proposed

2011 SDF Proposed

2012 SDF Proposed

2013 SDF Proposed

2014 SDF Proposed

2015 SDF

5/8" x ¾" 20 $9,619 $9,937 $10,266 $10,605 $10,957

¾" x ¾" 30 $14,356 $14,831 $15,322 $15,829 $16,353

1" 50 $23,975 $24,768 $25,588 $26,434 $27,310

1.5" 100 $47,805 $49,387 $51,022 $52,711 $54,455

2" 200 $95,755 $98,923 $102,198 $105,579 $109,075

3" 500 $239,315 $247,233 $255,418 $263,869 $272,605

4" 1,000 $478,485 $494,317 $510,682 $527,581 $545,045

6" 2,000 $957,115 988,783 $1,021,518 $1,055,319 $1,090,255

In order to maintain SDF revenues to match increases in capital costs over time, Red Oak recommends that the SDFs for water resources be escalated for the study period of 2011 through 2015. Using 2011 as the base year, the fees presented below are escalat-ed at 3.31 percent per year.

Table 6-2: Proposed Water Resources SDF Implementation Schedule

The Town currently assesses all water resources customers a monthly service charge per SFE. The water resources charge calculated per SFE and for each of the larger meter sizes is presented below.

Table 6-3: Current Monthly Water Resources Charge

Please refer to the 2010 Utilities Rates and Fees Study – Vol. 1 & 2, 2011 – 2015 Rates for further information.

Meter Size Monthly Charge

3/4" $23.00

1" $87.17

1 1/2" $164.91

2" $275.77

3" $517.96

4" $1,321.35

6" $2,136.93

Volumetric Rate

Bulk Customer, Per Kgal

$0.48


25

References

Black & Veatch, 2009 Investigation of Cooperative Water Management Alternatives for Aurora Water / Denver Water (ADW2), Draft Final Project Overview Memorandum March 2009

CDM, 2008 Water Resources Implementation Plan

CDM, 2009 Aquifer Storage & Recovery Pilot Testing Program – Phase I - Feasibility Evaluation

CDM, 2011 SMWSA 2010 Regional Water Supply Master Plan Update

CH2M Hill, Inc., 2007 Town of Castle Rock Water Resources Strategic Master Plan

Red Oak Consulting, 2010 Utilities Rates and Fees Study Vol.1 of 2 – 2011-2015 Rates

W.W. Wheeler & Associates, 2002 Plum Creek

W.W. Wheeler & Associates, 2008 DRAFT Plum Creek Water Supply Project


26

Appendix A—Castle Rock Capital Improvements Program

Castle Rock Capital Improvements Program 0-5 YR 6-10 YR 11 YR - Total

2010 2011 2012 2013 2014 2015 Subtotal 2016 2017 2018 2019 2020 Subtotal Build Out

CAPITAL COSTS

Plum Creek Water Purification Facility (PCWPF) $13.0 $0.00 $0.00 $0.00 $0.00

Assume $3.25 per gal for 4 MGD

Plum Creek North Well Field $1.5 $0.00 $0.00 $0.00 $0.00

$1,000 per foot to drill and develop. $100K to drill, develop, and

equip a 40'-50' alluvial well. Assume $100K for Raw waterline

Plum Creek Central Well Field $1.5 $0.00 $0.00 $0.00 $0.00

$1,000 per foot to drill and develop. $100K to drill, develop, and

equip a 40'-50' alluvial well. Assume $100K for Raw waterline

Plum Creek South Well Field $0.5 $0.00 $0.00 $0.00 $0.00

Raw Water Pipeline from PCCWF to PCWPF $2.3 $0.00 $0.00 $0.00 $0.00

Assume 24" line from PCCWF to PCWPF (11,500 ft), $8.25 per in-

Diameter

Raw Water Pipeline from PCNWF to PCCWF $2.2 $0.00 $0.00 $0.00 $0.00

Assume 24" line from PCNWF to PCCWF (11,000 ft), $8.25 per in-

Diameter

Raw Water Pipeline from Plum Creek South Well Field (PCSWF) to

PCWPF $1.6 $0.00 $0.00 $0.00 $0.00

Assume average of 16" line from PCSWF to PCWPF (~12,000 ft),

$8.25 per in-Diameter

Plum Creek Diversion Structure $0.00 $1.0 $1.00 $0.00 $1.00

Based on buy-in cost provided by United WSD

Raw Water Pipeline from Diversion to PCNWF $0.00 $4.2 $4.20 $0.00 $4.20

Assume 24" line from Diversion Structure to PCNWF (21,500 ft),


Expansion of PCWPF (Growth Related) $0.00 $0.00 $12.00 $12.00

Assume $2.00 per gal to expand (6 MGD to 10 MGD total)

ASR Program $0.02 $0.4 $0.40 $0.5 $0.50 $0.00 $0.90

Based on Phase I ASR (Pilot Testing for 2 years) bring wells

online gradually

Chatfield Reallocation $5.2 $5.20 $0.00 $0.00 $5.20

Revised storage allocation from 1487 AF to 800 AF. Assume cost

of mitigation per AF is $6,500 per AF

RHR 404 Permit Revision $0.2 $0.00 $0.00 $0.00 $0.00

Cost for consultant time to revise permit to allow renewable

water (S. Platte Water)

Chambers Road Pipeline and PS $0.00 $17.1 $17.10 $0.00 $17.10

Based on 30% Design by CDM and preliminary cost estimate.

Potable Water Pipeline from RHR to Tank 14 $4.5 $4.50 $0.00 $0.00 $4.50

Assume 18" line for 30,000 lf at $8.25 per in-Diameter

RHR Pump Station (Equipped to 5 MGD) $3.5 $3.50 $0.00 $0.00 $3.50

Assume $.7 M per MGD

Parker WSD Infrastructure Share $0.1 $0.10 $0.00 $0.00 $0.10

Minimal capital improvements required

Regional Water Treatment Plant (RWTP) (10 MGD TCR Share) $0.00 $40.0 $40.00 $0.00 $40.00

$4.00 per gal capital cost

Parallel Potable Water Pipeline from RHR to Tank 14 (15 MGD) $0.00 $7.5 $7.50 $0.00 $7.50

30,000 LF of 30" at $8.25 per in-Diameter

Increase Capacity of RWTP by 10 MGD $0.00 $0.00 $20.00 $20.00

$2.00 per gal capital cost (Additional 10 MGD for total 20 MGD)

Increase Capacity to RHR Pump Station (By 15 MGD for total of 20

MGD) $0.00 $1.5 $1.50 $3.00 $4.50

Assume $.3 M per MGD. Additional 5 MGD in 2020 to total 10,

then additional 10 to total 20 MGD at BuildOut

Water Rights Acquisition $4.0 $11.0 $11.00 $22.0 $22.0 $44.00 $74.80 $129.80

Assume $22,000 per AF includes acquisition and water court

(5900 AF of firmed, senior Middle South Platte water rights

delivered to the ECCV Northern WTP were required)

Lupton Bottoms Water Rights $0.6 $0.60 $0.00 $0.00 $0.60

WISE Participation Agmt (50 AF at $12K per AF)

0 - 5 YR 6 - 10 YR

Cost Justification

Castle Rock Capital Improvements Program 0-5 YR 6-10 YR 11 YR - Total


0 - 5 YR 6 - 10 YR

Cost Justification

ECCV Northern Lines (5.25 MGD Variable) $4.0 $0.00 $0.00 $0.00 $0.00

$750K per MGD

ECCV Western Lines (1.4 MGD Firm) $2.1 $0.00 $0.00 $0.00 $0.00

$1.5M per MGD

ECCV Western Lines (5.25 MGD Variable) $4.0 $0.00 $0.00 $0.00 $0.00

$750K per MGD

Northern WTP (1.4 MGD Firm) $0.00 $0.00 $7.00 $7.00

Castle Rock is responsible for 100% of firm capital costs

associated with the ECCV Northern WTP, which is a bypass RO

plant (Assumes a unit capital cost of $5.00 per gal)

Northern WTP (5.25 MGD Variable) $0.00 $0.00 $13.10 $13.10

Castle Rock is responsible for 50% of variable capacity costs

associated with the ECCV Northern WTP, which is a bypass RO

plant (Assumes a unit capital cost of $5.00 per gal)

Northern Pumps (1.4 MGD Firm) $0.00 $0.00 $1.00 $1.00

Castle Rock is responsible for 100% of firm capital costs

associated with the two ECCV Northern Line Pump Stations

(Assumes a unit capital cost of $0.70 M/mgd per station)

Northern Pumps (5.25 MGD Variable) $0.00 $0.00 $1.84 $1.84

Castle Rock is responsible for 50% of variable capacity costs

associated with the two ECCV Northern Line Pump Stations

(Assumes a unit capital cost of $0.70M/mgd per station)

Utilities Operations & Maintenance Plan $0.18 $0.2 $0.20 $0.00 $0.00 $0.20

Space Planning

Woodlands Medians $0.04 $0.00 $0.00 $0.00 $0.00

Possible Retainage

Meadows Medians $0.02 $0.00 $0.00 $0.00 $0.00

Possible Retainage

Denver Spot Water $0.03 $0.03 $0.03 $0.03 $0.03 $0.03 $0.15 $0.00 $0.00 $0.15

Storage of 100 AF water in Gravel Pit along S. Platte

Conservation Web Site $0.04 $0.00 $0.00 $0.00 $0.00

web site development

Total Capital Costs ($ Millions) $37.2 $0.8 $5.3 $0.4 $19.0 $0.0 $25.7 $5.2 $39.1 $0.0 $22.5 $49.0 $115.8 $132.7 $274.2


28

Appendix B—WISE Long Term Implementation CIP

WISE Long Term Implementation CIP 0-5 YR 6-10 YR 11 YR - Total


CAPITAL COSTS




$1,000 per foot to drill and develop. $100K to drill, develop,

and equip a 40'-50' alluvial well. Assume $100K for Raw

waterline




waterline



Assume 24" line from PCCWF to PCWPF (11,500 ft), $8.25 per

in-Diameter


Assume 24" line from PCNWF to PCCWF (11,000 ft), $8.25 per

in-Diameter


PCWPF $1.6 $0.0 $0.0 $0.0 $0.0




Based on buy-in cost provided by United





Assume $2.00 per gal to expand (Additional 6 MGD to total 10

MGD)

ASR Program $0.02 $0.4 $0.4 $0.5 $0.5 $0.0 $0.9


online gradually


Revised storage allocation from 1487 AF to 800 AF. Assume

cost of mitigation per AF is $6,500 per AF







Assume 18" line for 30,000 lf at $8.25 per in-Diameter. Gives

5.71 MGD at 5 fps



Parker WSD Infrastructure Share $0.1 $0.1 $0.0 $0.0 $0.1

Minimal capital improvements required. Treatment provided

through Parker WSD as O&M charge



Parallel Potable Water Pipeline from RHR to Tank 14 (15 MGD) $0.0 $7.4 $7.4 $0.0 $7.4

30,000 LF of 30" at $8.25 per in-Diameter

Increase Capacity of RWTP $0.0 $0.0 $20.0 $20.0


Increase Capacity to RHR Pump Station $0.0 $1.5 $1.5 $3.0 $4.5



Water Rights Acquisition (AF/Y) $1.0 $0.0 $0.0 $0.0 $0.0

No Water Rights purchases anticipated because of WISE Project


Space Planning


Possible Retainage

Meadows Medians $0.02 $0.0 $0.0 $0.0 $0.0

Possible Retainage




0 - 5 YR 6 - 10 YR

Cost Justification


30

Appendix C—WISE Immediate Implementation CIP

WISE Immediate Implementation CIP 0-5 YR 6-10 YR 11 YR - Total


CAPITAL COSTS






waterline




waterline



Assume 24" line from PCCWF to PCWPF (11,500 ft), $8.25 per

in-Diameter


Assume 24" line from PCNWF to PCCWF (11,000 ft), $8.25 per

in-Diameter


PCWPF $1.6 $0.0 $0.0 $0.0 $0.0




Based on buy-in cost provided by United





Assume $2.00 per gal to expand

ASR Program $0.02 $0.4 $0.4 $0.5 $0.5 $0.0 $0.9


online gradually


Revised storage allocation from 1487 AF to 800 AF. Assume

cost of mitigation per AF is $6,500 per AF







Assume 36" line for 30,000 lf at $8.25 per in-Diameter





Increase Capacity of RWTP $0.0 $0.0 $20.0 $20.0


Increase Capacity to RHR Pump Station $0.0 $1.5 $1.5 $3.0 $4.5



Water Rights Acquisition (AF/Y) $1.0 $0.0 $0.0 $0.0 $0.0

Renewable Water provided through WISE Partnership project.

All future "necessary" infrastructure investments are adjusted

in the water rate.


Space Planning


Possible Retainage

Meadows Medians $0.02 $0.0 $0.0 $0.00 $0.00

Possible Retainage




0 - 5 YR 6 - 10 YR

Cost Justification

2010 water resources master plan update

Documents