Client: US Navy
Location: San Nicolas Island, CA
This truly unique “one-of-a-kind” project consisted of constructing a 270 foot by 35 foot open-ocean concrete supply pier for roll-on/roll-off cargo transfer capabilities. The pier and dolphin structures are approximately 640 feet long with a deck elevation that varies from ten feet to 29 feet above Mean Low Low Water (MLLW). The pier has an adjustable mechanical ramp that is lowered to the water elevation for the barge landings. The fixed concrete pier is the key connection point between the land and the 180 foot by 22 foot steel mechanical ramp that lowers from deck elevation to water level at times of barge arrivals for roll-on/roll-off cargo transfer.
The new pier has 70 each 24” concrete piles with a 12” pipe cast inside each pile. The installation process was to drill through the 12” pile and install a rock anchor through this 12” pile to allow for significant improvement of both lateral and tension capacity.
Supporting facilities include electrical, water, and telephone connections. Nova provided a 250 kW / 480 Volt generator to provide power for security lighting and power requirements on the new concrete supply pier. Paving and site work included a parking area at the base of the pier and miscellaneous road repairs. The project also required demolition of several small buildings as well as construction of a new operations building and equipment storage building in this remote location.