WSP04272

• File Number: 8277.600.10
• Description: Big Sandy River Unit - Colorado River Salinity Control Program
• State: WY
• Basin: Colorado Mainstem
• Date: 3/1/1989
• Title: Planning Report Concluding the Study on Big Sandy River Unit - Wyoming
• Water Supply Pro - Doc Type: Report/Study

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SUMMARY (Continued)

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Alternatives

Beneficial Use

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The alternatives were studied in three distinct formulations.
Nine preliminary alternative plans were developed in the first
formulation. For reformulation, no individual alternative from
the original nine was retained; however, certain features of some
of the plans were utilized to form six reformulated alternatives.
To account for the anticipated sequence of future water
acquisition by industrial users and the economic uncertainties in
the area, three alternative future conditions were analyzed which
in turn led to the formulation of six alternatives. Of the six,
only three alternatives were felt to be viable at the time.

Alternative I-Chevron proposed development of 7,000 acre-feet of
water annually for Chevron Chemical Company to meet part of its
total 13,700 acre-foot requirement. A well field would be
installed in the Big Bend area to provide water to a 41.2 mile
pressurized pipeline which would run southeast to a fertilizer
plant. Development of this plan would result in a salt load
reduction to the Colorado River of 52,700 tons annually at a cost
of $71 per ton.

Alternative 2-Chevron and Texasgulf (Bone Draw) proposed
development of 12,000 acre-feet of water to supply both Chevron
and Texasgulf. Well fields would be developed in both the Big
Bend and Bone Draw areas to provide water to a single a-mile
pressurized pipeline which would run south of the well fields.
From this point the pipeline would diverge into 35-mile and
23-mile branch lines to Chevron and Texasgulf, respectively.
This alternative would result in a salt load reduction in the
Colorado River of 64,200 tons annually at a cost of $96 per ton.

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Alternative 6-Chevron and Texasgulf (without Bone Draw) is
essentially the same as alternative 2 except wells in the Bone
Draw area were deleted from the plan and the number of wells in
the Big Bend area increased to provide 12,000 acre-feet annually.
The salt load reduction in the Colorado River would be reduced by
77,300 tons annually with this alternative at a cost of
approximately $70 per ton. The cost analysis of the three
alternatives together with alternative future condition 1, is
shown in summary table 1.

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Chevron Chemical Company constructed only phase 1 of their
phosphate fertilizer plant and indicated they did not plan to use
Big Sandy saline water in the first two phases of construction.
Texasgulf postponed expansion of their trona plant indefinitely

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