C153935 Contract

• Contract/PO #: C153935
• Contractor Name: Brown and Caldwell
• Contract Type: Grant
• Water District: 0
• County: Jefferson
• Loan Projects - Doc Type: Contract Documents

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Exhibit A

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Colorado Department of Natural Resources
Colorado Water Conservation Board
"Chatfield Reservoir Storaae Use Patterns Investiaation"

Work Plan: December 2001

Introduction

This contract and the accomplishment of the performance tasks shall work in compliance with the
provisions of the Corps of Engineers (Corps) Contract for the Chatfield Storage Reallocation Study
("Study"), Littleton, Colorado. The general contractor for the Study is Simons and Associates, Fort
Collins, Colorado. The Study is under the administration of the Corps Omaha District. The general
contractor's Project Manager for the Study is Robert Simons @ 970 223-9973.

The CWCB contractor ("contractor") shall be fully informed of the Study provisions with an
emphasis on the sections entitled "Alternative Operational Criteria; Hydrologic data to be used;
Storage Use Patterns (to be by provided by Sponsor); and Hydrologic Models and Analyses".

The primary purpose of this Work Plan is to perform the tasks described in the Storage Use
Pattern portion of the Study which states: For each target pool elevation to be evaluated, water
use patterns will be developed, including realistic patterns of storage and release. These
patterns will be used in various hydrologic modeling scenarios. The storage patterns will
reflect storage opportunities under both junior and senior water rights. The release patterns
will reflect the potential use of storage considering water supplies for municipal water
supply and other decreed purposes. Potential use patterns will consider the conjunctive
use of surface and ground water, augmentation supplies, and present carryover storage
capacity. Opportunity for maintaining or enhancing recreation and environment values
within urban reaches of the South Platte River and at Chatfield and Cherry Creek Reservoirs
will also be considered.

Objective

This contractor will develop storage use patterns (also call the water supply demand criteria) for
the Study's operational model for the Chatfield Reservoir hydrologic investigations.

The Contractor shall perform the following major tasks, as more fully described in the following
section:

· Develop the target amounts of reservoir capacity to be analyzed for reallocation from flood
control space to additional conservation storage space.

· Identify water rights available for storage in the reallocated space.

· Identify potential users of the reallocated space and evaluate their potentials uses.

· Acquire available modeling data.

· Develop representative storage use patterns for the target amounts of reallocated space.

. Prepare report and bibliography.

Performance Tasks

The contractor shall fully address the following tasks in the performance of the CWCB contract:

1. Develop the target amounts of reservoir capacity to be analyzed for reallocated from flood
control space to additional conservation storage space. During the drafting of the Study, four