C154141 Feasibility Study

• Contract/PO #: C154141
• Contractor Name: AECOM USA, Inc.
• Contract Type: Grant
• Water District: 0
• Loan Projects - Doc Type: Report

Table E3. Comparison of Options
O tion Positive As ects Ne ative As ects
• Low unit storage cost • High land acquisitions cosUissues
• Gravity-fed conveyance does not require • Potential constructability issues due to
1 A um in conve ance eolo
• Low unit storage cost • High land acquisitio�s cost/issues
• Gravity-fed conveyance does not require • Potential constructability issues due to
1 B um in convevance eolo
• Low unit starage cost (cost is slightly lower • Greenhouse gas emissions from pumping
than Options 1 A and 1 B, but are considered • Uncertainty of future operating costs due to
equal based on this preliminary level of study) potential escalation in the price of pumping
• ShoR conveyance distance (less land acquisition energy.
cost/issues)
• No impacts to water quality or flow through
Dominguez-Escalante National Recreation Area
1C since diversion int is downstream
• Gravity-fed conveyance does not require • High unit storage cost
pumping • High land acquisitions cost/issues
• Potentiaf constructability issues due to
2A conve �ance eolo �
• Gravity-fed conveyance does not require • High unit storage cost
pumping • High land acquisitions cost/issues
• Potentia] constructability issues due to
2B conve ance eolo �
• Short conveyance distance Qess land acquisition • High unit storage cost
cost/issues) • Greenhouse gases from pumping
• No impacts to water quality or flow through . Uncertainty of future operating costs due to
Dominguez-Escalante National Recreation Area potential escalation in the price of pumping
2C since diversion point is downstream ener
Recommendations
Without strong indication of support for further analysis and demonstrative need for the project output,
postpone further State investigation indefinitely it is recommended that no further action be taken. If the
specific need and funding source for the project are identified, the following procedural steps are
recommended for any potential future investigations of the Grand Valley Lake Project:
]. Meet informally with state and federal agency personnel familiar with the latest details of land
management and environmental programs including Aspinall Unit operations and programs in
the Gunnison and Colorado Rivers upstream of their confluence at Grand Junction to confirm the
general accuracy and appropriateness of the preliminary information presented herein.
Consider revisions or additional scenarios as appropriate to alter the assumptions on project yield
allocated to environmental purposes and clarify current understandings of the status of the
endangered species programs on the Colorado and on the Gunnison Rivers.
AECOM
2/22/10
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