Wenger 72944 Especificações descarregar pdf (Página 246)

Section 6 The Selected Alternative Plan

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

6-18

6.4 DESIGN AND CONSTRUCTION CONSIDERATIONS

6.4.1 Embankments and Canals

6.4.1.1 Reservoir Embankments

The embankments for the EAA Reservoir will be constructed in their entirety

from materials found on the Project site. Earthen embankments will be

constructed as “zoned” type embankments, see typical sections in Appendix A on

Plates G-2 through G-4. This is defined as an embankment with zones of

differing gradations. The center or the core of the embankment is made of a

selected graded material that will provide the low permeability properties

desired. Other zones surrounding the core (random fill) usually do not require

the low permeable properties of the core, but need to be structurally stable. This

type of zoned embankment construction will minimize the amount of processing

required on the excavated material, hence, reducing the cost. Based on site

geology, the core material will be obtained from the silty sand/limestone layer

the lies below the caprock layer. It is believed that the material obtained from

this layer will not need any processing to obtain the desired properties once in

place. The random fill material, or the exterior layer of the embankments, is

defined as the material to be obtained from the blasting of the top caprock layer,

mixed with the additional silty sand/limestone materials material and any other

surplus of suitable material obtained from the excavation operations. No specific

processing is assumed for this type of material. However, rock blasting

operations must be designed to produce the desired aggregate size which

typically has a maximum particle size of 8 inches.

The reservoir embankments will be constructed with a 12-foot wide crest.

Earthen embankments will have 1V on 3H slopes on both sides. A 20-foot wide

maintenance/service road will be placed on the toe of the exterior side of the

embankment. The road will be unpaved, and constructed with random fill

material. The interior slopes of the exterior embankment, facing the inside of

the reservoir, will be protected with riprap and soil-cement, while the outside

slopes will be grassed. Some of the design features are presented below.

6.4.1.1.1 Wave Breaking Bench

A wave breaking bench will be constructed along the inside slope of both types of

reservoir embankments. This wave-breaking bench will be constructed to an

elevation 3 feet below the Maximum Surcharge Water Level. The bench will be

25 feet wide on the top, with 1V on 3H side slope. The wave-breaking bench will

be constructed with random fill material and protected, see details.

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Wenger 72944 Especificações Página 246