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Levee 31N Lithological & Geophysical Data
Monitoring wells and test coreholes were drilled on or along the eastern side of Levee 31N for this study. The test coreholes (G-3782, G-3783, G-3788, and G-3789) were completed as open-hole stratigraphic tests, and the monitoring wells (G-3778, G-3779, and G-3784) were constructed with screened polyvinyl chloride (PVC) casing near their bottom. All test coreholes were drilled along an undeveloped road between the Levee 31N canal and the Levee 31N berm, and the monitoring wells were drilled at the top of the Levee 31N berm. The project test coreholes were continuously cored using a conventional coring method to depths of about 68 feet below ground level, which generally corresponds to the uppermost part of the Tamiami Formation in the study area. The conventional coring method uses hydraulic rotary coring using freshwater as a drilling fluid (Shuter and Teasdale, 1989).
The monitoring wells were drilled using one or more methods: conventional coring, standard penetration test (SPT), or hydraulic rotary methodology (Shuter and Teasdale, 1989). The SPT methodology employs a split-barrel sampler, and the hydraulic rotary method employs the tricone roller bit using mud as a drilling fluid. The deepest monitoring wells, G-3778 (109 ft) and G-3784 (108 ft), were continuously cored using the conventional coring method and SPT methodology. With the conventional coring method, both wells were continuously cored to a depth of about 52 and 46 feet below ground level, respectively. The SPT methodology was employed at wells G-3778 and G-3784 to advance the split-barrel sampler in 1.5- to 2-foot intervals to the total well depths (109 and 108 feet, respectively). Well G-3779 was continuously cored using the conventional coring method to a total depth of 54 feet below ground level. All of the monitoring wells were completed using 2-inch solid PVC casing with 2-foot length of screened PVC near the base of the casing. Drilling was conducted from July 8, 2003, to November 19, 2003.
U.S. Department of the Interior, U.S. Geological Survey
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Last updated: 15 January, 2013 @ 12:42 PM (KP)
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