Wenger 72944 Dokumentacja Pobierz pdf (Strona 214)

Section 5 Formulation of Alternative Plans

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

5-60

Florida Cement and CSR Rinker. Recent concerns with cement availability have

proven Florida is in a unique market with demand exceeding all historic records.

Florida was named a leading national “hot market” with the other two prevalent

developing geographic areas, Texas and California. In 2001, estimating future

projects, recently or currently bidding, developed concrete unit pricing of $65/CY.

For these same projects, estimating now has concrete at $95/CY (a 46%

increase). Regional cement production increases are under development, but

much will go to current distribution networks and record level imported cement

is also linked to Florida cement operators. Expansion efforts by the cement

industry typically take up to four years with permitting and construction.

Fuel pricing variability will apply nearly equal to both Earthen Embankment

and RCC alternatives. Alternative pool depths also affect quantities of materials

to be placed and operations costs of fuel-powered equipment. December 2004

pricing for on-road and off-road diesel was $1.19 and $0.93. Mid-2005 estimated

pricing is $2.01 and $1.80 (+67% and +94%). While the RCC footprint is smaller,

it involves hauling from a central batch plant and is equipment sensitive for

placing.

Site and geology risks include additional foundation preparation required for

RCC where cap rock thins out, and available quantities of near by borrow source

materials for both systems. Current assumptions for foundation prep and

correction of defects are estimated at approximately 20% for RCC embankment.

RCC requires general removal of peat and undesirable surface material cleanup,

dental concrete work; thin caprock and existing cavities sections require full or

partial depth RCC placement. Formation of cracks will contribute to through

seepage (no waterstops). An Earthen Embankment requires general removal of

peat and undesirable surface material cleanup, and some dental concrete work.

The basic difference in site and geology relates to quantities of materials to be

placed. The RCC section has an advantage with the smaller footprint and less

total quantities of materials placed. The seepage canals provide most of the

needed materials – blasted rock, silty-sands, and remaining is quarried near the

centrally located batch plants. The Earthen Embankment also uses the seepage

canals and central borrow areas for available embankment fill materials. The

interior for both systems includes earth embankments that are soil-cement and

riprap covered, and these embankments are placed to reduce wave run up.

Silty-sands excavated in the wet require drying by turning and disking prior to

use. RCC is given an advantage for erosion control as the Earthen Embankment

requires riprap to the top of inside face and stone for crest as a wearing surface.

Seepage control is provided by bentonite filled slurry walls. The depths of the

slurry wall for the Earthen Embankment vary from 35- to 50-Foot. The depth of

the slurry wall is 50-Feet for RCC due to having a smaller section increasing.

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