C154141 contract docs

• Contract/PO #: C154141
• Contractor Name: AECOM USA, Inc.
• Contract Type: Grant
• Loan Projects - Doc Type: Contract Documents

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Grand Valley Lake Conceptual 5tudy
Work Scope, Scheduie and Budget Estimate
INTRODUCTIUN
A presentation of a potential "Grand Valley Lake" (GVL) pro}ect was made to the Colorado Water Conservation
Board (CWCB) in September 2007. Subsequent to that presentation, the Redlands Water and Power Company
(Redlands) and the Orchard Mesa Irrigation District (OMID) made a joint request to the CWCB fox a
cornprehensive study of the feasibility af the project. Project information, including letters of support for the
study from the two study sponsors, was provided ta the CWCB in a dooument titled "Potential Grrand Valley Lake
Study" that was compiled by Donald E. Clay Professional Engineers and Associates. This supporting information
is referred to below as "Clay 2007 Document". It contains preliminary information for a new darn and reservoir
south of the Colorado River, between the towns of Crraiid Junction and Palisade, Colorada described as follows;
"This plan would divert about 300 cfs of water from the Gunnison River via 50 — 60 miles of canal and
tunnels. T'he aqueduct would provide an average annual water supply of 175,400 acre-feet to the potential
Grand Valley Lake (Reservoir) for use in the Grand Valley and surrounding areas. The offstream lake
would a surface area of about 1,SQ0 — 2,000 acres."
Other information presented in the document includes:
+ Preliminary Cost Estimates and Layouts
• Site Geology
• Hydrology
• Water Quality
• Water Rights
• Economics
The information in the document has varying levels of detail. The information presented in the Clay 2007
Document will be reviewed for reasonableness and consistency.
The purpose of the eurrent study is defined in tYae Work Scope below, and will provide general assessments to:
1. assess general feasibility from geologic/geotechnical and hydraulic engineering perspectives;
2. assess the relative magnitude and potential sources of construction materials for alternative types of dams;
3. assess the relative suitability of the project from a reservoir/demand/yield perspective;
4. qualitatively assess tt�e impacts to the river from alternative operational scenarias;
5. identify the major pernuts and/or regulatory approvals that would likely be needed; and
6. provide conceptual level opinions of probable construction costs.
The Work Scope is comprised of five tasks: 1) Project Management; 2) Data Colleetion and Review; 3) Site
Reconnaissance; 4) Data Analysis and 5) Project Report. These categories are listed in chronolo�ical order of
when they begin, even though there will be overlap in execution. Detailed descriptions and deliverables for each
task are presented below.
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