The project includes the design of a proposed taxiway at the Delaware Coastal (DCA). N&W is the Geotechnical Engineer of Record and to date has completed the drilling, and field CBR tests. We are currently performing lab testing for the taxiway pavement design.
The field work consisted of thirty-eight (38) test borings and four (4) field CBR tests. The drilling consisted of approximately 360 feet of continuous SPT sampling and 25 of unsampled footage to obtain bag samples for CBR testing. We mobilized our track-mounted Acker Scout rig to drill the borings and our truck-mounted Acker AD-II rig to perform the field CBR tests.
The boring and field CBR locations were adjacent to an active taxiway so the time window for drilling was limited as FAA requirements forced the shutdown of the active taxiway while drilling was being performed. An elaborate laboratory testing program is currently underway to develop remediation procedures to improve the proposed taxiway subgrade to provide better long-term pavement performance.