building a 2 story waterfront home on Intracoastal in Florida. Most of the building pad is:
Stratum 1 - Loose light gray to dark brown fine sand to 2 to 4 ft below grade
Stratum 2 - dense cemented sand and shell to 9 to 12 ft below grade
Stratum 3 - refusal (presumed limestone, sandstone, or...