In Fort Lauderdale, the conversation about groundwater starts the moment you break ground. The Biscayne Aquifer sits right under us, and its high transmissivity in the local Miami Limestone and Fort Thompson Formation means standard lab tests on a small sample won't cut it. We run the Lefranc test in soil and weathered rock to get a direct K value right at the depth of your future excavation, and switch to the Lugeon test when we hit competent limestone. CPT testing can screen the profile quickly, but for the actual hydraulic conductivity the regulators need to see, a test pit inspection combined with an in-situ falling-head test gives you defensible, site-specific numbers.
A Lugeon value above 10 in Fort Lauderdale limestone usually means open solution channels. That's not a number you want to discover halfway through an excavation.
