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Engineering Disciplines
Services
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Bulkheads & Retaining WallsSausalito Yacht Harbor Bulkhead Repair, Sausalito, CA.NCI performed the engineering design for replacement of a 500-foot timber pile bulkhead. Services included a site and geotechnical investigation; topographic and boundary survey; feasibility analysis of alternative construction materials and methodologies; final design; and preparation of plans, specifications, contract documents and construction cost estimate. The improvements included a tied-back concrete sheet pile bulkhead, public promenade, landscaping, drainage and repavement of the parking lot. Bolinas Lagoon Bulkhead Replacement, Stinson Beach, CA.This project consisted of replacing a failing bulkhead with a new bulkhead along 675 lineal feet of Bolinas Lagoon fronting ten properties at the western end of Seadrift Road within the Seadrift Estates. NCI provided all required engineering services consisting of initial assessment/feasibility of bulkhead repair alternatives; processing and securing all required regulatory permits; performing engineering design of the selected bulkhead alternative; preparation of construction drawings, specifications and contract documents; contractor bidding and award/negotiation of contract; and full time construction management and inspection during construction. The selected bulkhead alternative consisted of installing epoxy coated interlocking steel sheet piling anchored by Chance helical anchors/tie-rods which attach to the sheet piles by use of a double steel channel waler system spanning the length of the bulkhead and that is encased within a reinforced concrete bulkhead cap. The new bulkhead system was installed directly behind the failing bulkhead with the failing bulkhead then removed after installation of the new bulkhead sheet piles. Newport Harbor Patrol Headquarters Bulkhead, Newport Beach, CA.NCI initially evaluated alternative replacement bulkhead designs, and then performed the final engineering design and preparation of construction drawings and specifications for the selected alternative. This replacement bulkhead consisted of a coal tar epoxy coated steel sheet pile bulkhead driven into a very hard bottom. The bulkhead was anchored by use of a double corrosion protected Dywidag tie-rod system secured to the sheet piles by use of a double steel channel waler, and anchored on the landward side by an anchor system consisting of tension and compression steel H-piles with a reinforced concrete cap per each tie-rod. The tension piles also incorporated drilled/grouted Dywidag rock anchors for additional tension capacity. A reinforced concrete cap encased the steel channel waler and top of sheet piles. This new bulkhead was installed directly outboard of the 50-year old existing bulkhead prior to construction of the new County harbor patrol headquarters building and other site improvements. NCI also provided construction support services throughout the bulkhead's construction. Coronado Cays Waterfront Development, San Diego, CA.
Plum Island Bulkhead Replacement, Foster City, CA.NCI provided all waterside engineering for the development of Ventura Keys, a residential waterfront community, which is located adjacent to and north of Ventura Harbor, and shares the Ventura Harbor entrance channel to the ocean. The residential waterfront channels and slope protection were excavated and constructed in the dry prior to final excavation of the earth plug separating the development from the ocean waters. Engineering planning and design services included excavation/dredging of the channels/side slopes; stone riprap slope protection; and floating docks, piling and gangways for the entire development. Construction support services were also provided during construction of this waterfront community. |
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NCI provided planning and engineering design services for the marine aspects of this $100-million waterfront development, which included over five miles of reinforced concrete sheet pile bulkheading, riprap slope protection, floating breakwater protection, dredging, and marking of navigational channels. Work included the preparation of plans, specifications and construction cost estimates, along with onsite construction inspection.