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Section 6 The Selected Alternative Plan

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

6-20

will be built on the reservoir side of the canal by scrapping of the peat layer with

no additional blasting. The littoral shelf will be built at a 1V:5H slope for the

first 15 feet and 1V:2H slope to the canal base. Where the caprock intersects the

littoral shelf it will be sloped to the extent practicable. The seepage collection

canal will be located along the exterior of the east, north and west sides of the

reservoir.

6.4.1.3.2 Seepage Buffer

The seepage buffer will be a minimum of 200 feet wide, measured from the

reservoir’s edge of the service road to the beginning of the littoral shelf within

the seepage canal. These areas will be provided with intermittent wetland and

island zones to provide environmental benefits for fish and wildlife.

6.4.2 Structures/Structural Requirements

6.4.2.1 Design Criteria

6.4.2.1.1 Loading Conditions

Each standard design is developed to withstand usual, unusual, and extreme

loading conditions. Usual loading conditions include loads most frequently

experienced by the structural system when performing its primary function

throughout its normal service life. Unusual loading conditions, such as

construction or maintenance operations, produce short duration loads, and their

occurrence is not frequent. Extreme conditions such as the standard project

floods, and hurricane wind force is the worse case scenario; extreme loads

represent the widest deviation from the usual and unusual loading conditions.

6.4.2.1.2 Stability

EC 1110-2-291 criteria are followed for the Stability Analysis of Concrete

Structures, which includes the overturning, bearing, and sliding checks. A

structure importance factor and site information factor of 1.0 has been assumed

for design.

6.4.2.1.3 Concrete

EM 1110-2-2104, Strength Design for Reinforced Concrete Hydraulic Structures

and ACI-318-99, Building Code Requirements for Structural Concrete are used

for structural concrete design. A compressive strength of 3-ksi and yield

strength of 60-ksi for tension reinforcement has been assumed for design.

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