by 
John Doe
ANSWERS: 1
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This is not a question that can be answered with any degree of reliability, since you have provided no information as to the construction requirements. At the very least, the cost will reflect the cost of the fill required to create the island. Fill includes large rock, crushed aggregate, sand, and soil. It also includes the fill required beneath the waterline, to the maximum depth of the water in the area. The slope of the ground under the waterline, will generally be no more than 45 degrees and, possibly, less depending on conditions such as surface stability, currents, and tide.
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