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Section 5 Formulation of Alternative Plans

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

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FIGURE 5-4: ALTERNATIVE 6 DESIGN LAYOUT

TABLE 5-6: ALTERNATIVE 6 DESIGN SUMMARY.

Parameter Values

Design Parameter

Cell 1 Cell 2

Storage Area (acres) 17,000 9,500

Normal Pool Depth (feet) 14 14

Total Fill Rate (cfs) 3,900 3,000

Time to Fill (days) 26 24

Drawdown Rate (cfs) 4,000 4,000

Time to Drawdown (days) 26 21

5.3.2.1 Reservoir Embankment Construction

As indicated above, two types of embankment construction were considered for

the EAA reservoirs. These include an earthen design for all alternatives

evaluated including the selected plan (Alternative 4), and an RCC design

(Alternative 5). Earthen embankments would be constructed in their entirety

from the materials found on the Project site (limestone layer found under the

cap-rock layer). RCC embankments would be built solely of the processed cap-

rock layer, with the addition of Portland cement and fly ash shipped in from

external sources. The majority of the materials would come from borrow areas

within the reservoir footprint while a small portion would be provided from the

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