Application Of Surface Geophysics For Providing A Detailed Geotehcnical Assessment Of A Large Resort Development Site In Anguilla, Bwi

N.S. Nettles & Associates (NSN) has completed extensive geophysical investigations that have guided engineering practices for a resort community in Rendezvous Bay, located in Anguilla, BWI. Diverse technologies were utilized, including; Multi-Electrode Resistivity (MER), Continuous Resistivity Profiling (CRP), and Multichannel Analysis of Surface Waves (MASW). Resistivity<br>techniques allowed for differentiation of geologic units and the identification of karst features and subsurface anomalies. To further determine sub-surface density variations, MASW transects were performed. This multi-method approach provided confidence in location of anomalies that were later targeted for drilling practices. Additionally, a stagnant salt pond was mapped with MER and CRP for the purposes of determining sediment thickness overlying rock and the competency of the limestone. This provided accurate volume calculations for dredging operations, the first phase in the transformation of the hypersaline pond to a functional marine habitat. Specifications were designed for a series of horizontal flushing channels connecting the salt pond with Rendezvous Bay. Cone Penetration Testing was utilized and geologists supervised the drilling of rock cores and Standard Penetration Test Borings to investigate anomalies and calibrate the geophysics. Results have provided the geologic framework for engineers to implement a successful construction strategy for the Rendezvous Bay Resort.