Crux provided drilling and geophysical services to locate and design the new intake system, completed in multiple phases of land-based and offshore drilling. The land-based program consisted of HQ3 borings drilled to depths of 600 feet on or near Saddle Island. The offshore program consisted of borings drilled depths of 300 feet below mudline in water depths ranging from 10 to 350 feet.
To mitigate environmental impacts within the National Recreation Area, Crux successfully contained drill fluids and spoils; utilized specialty fueling systems; and developed Best Management Practices. Additional challenges included severe weather and poor geologic conditions, which were especially impactful during offshore drilling. Crux overcame these difficult conditions by developing a multistring casing system to limit buckling of drill strings and allow for drill fluid recirculation.
In-situ testing was completed by Crux Oriented Borehole Logging (COBL), including optical and acoustical televiewer; natural gamma; temperature profile; permeability testing; and dilatometer testing. Offshore drills were equipped with data loggers to record penetration rates, drill pressure changes and other drilling parameters.