Peabody Coal Lower Basin Pipeline

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Peabody Coal Lower Basin Pipeline

• Engineering Appraisal Study
• Bureau of Reclamation
• September 18, 2002

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Purpose and Scope

• To develop alternatives to divert 5,700 and
  12,000 acre-feet of main stem Colorado River
  water from a point located downstream of Lee
  Ferry (0.0 mile), (including associated
  conveyance infrastructure necessary to deliver
  lower basin river water), to Kaibito, Arizona.

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Objectives

• To identify fatal flaws as related to the study
  purpose.
• Develop conceptual alternatives

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Assumptions

• Final report of findings to be reviewed and
  completed by September 20, 2002.
• Design for 5,700 and 12,000 acre-feet per year
  using a 1.2 peaking factor.
• Use existing available data.
• Study area limited to the corridor of land
  necessary for development of a diversion,
  storages, pipeline conveyance, right-of-way, and
  electrical infrastructure necessary to deliver
  water from the main stem Colorado River to the
  community of Kaibito, Arizona.
• Right-of-Way cost to be determined by Navajo
  Nation. (not included in project cost estimate)

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Investigations and Data

• Conducted and over-flight of the project area.
• Utilized Reclamations project database and made
  contacts with industry experts.
• Accessed Grand Canyon Research and Monitoring
  Center database.
• Obtained copies of completed studies in the
  project area and incorporated by reference.
• All data utilized in the Report of Findings are
  suitable for conceptual Appraisal Level studies.

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Alignment follows existing roadways
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Alignment Profile3,097 to 5702 elevation
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Infiltration Gallery
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8.0 Mile Jackass CanyonDiversion Site
Infiltration gallery
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Direction Drill _at_ Jackass Canyon
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Second Direction Drill _at_ Echo Cliffs
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Outlet of Direction Drill Hole at top of Echo
Cliffs
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Engineering Hydraulics
The peaking factor is based on information
received from the Settlement Negotiation Team.
Assuming a 1.2 peaking factor, pumping occurs 20
out of 24 hours on the maximum day, the required
design flow is 11.23 cubic feet per second
(ft3/s) and 22.68 ft3/s, respectively.
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PIPE TRENCHING COSTS Pipe Installation Item Unit
Cost (/cubic yard) Excavation (Rock
Trenching) 20.00 Pipe Bedding (Select
Material) 15.00 Backfill 3.25
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Environmental Impacts

• 28 species to be potentially considered in the
  scoping of potential fish and wildlife issues.
• Listed species are for Coconino County under the
  Federal Endangered Species Act.
• Consultation would also be required with the
  Navajo Nation to address project impacts to
  species on the Navajo Endangered Species List.
• Area through which the proposed pipeline may be
  constructed is rich in prehistoric and historic
  cultural resources going back perhaps as far as
  10,000 years in age.

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Project Cost EstimatesConceptual Appraisal
Level15 Unlisted Construction Costs25
Contingency

• Alternative 1 (5,700 acre-feet p/yr) 38
  million
• Alternative 2 (12,000 acre-feet p/yr) 58
  million

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Summary

• No identified fatal flaws at conceptual
  appraisal stage.
• Project alignment can change.
• Diversion point could possibly be moved upstream
  to alluvial basin in proximity to Lees Ferry
  crossing.
• Environmental Impacts to main stem Colorado River
  need more evaluation.
• Various degrees of uncertainty remain without
  additional data and analysis.