Engineering Disciplines


Services

Shore & River Bank Protection

Marina Park Shoreline Stabilization, Ventura, CA.

A detailed investigation was performed by NCI to assess the causes of chronic shoreline erosion at Marina Park for the purpose of recommending remedial action. Preliminary revetment, groin and beach fill designs were prepared to protect landward facilities while preserving recreational shoreline use opportunities. NCI assisted the City in working with local, State and Federal authorities to review environmental and technical concerns of the proposed project master plan. NCI then prepared the final engineering design, plans and specifications for a $1,200,000 revetment, and later completed the final design, plans and specifications for improvements to the groin structure.

Coyote Point Shoreline Protection, San Mateo, CA.

The Coyote Point Recreational Area, which fronts San Francisco Bay, was experiencing ongoing shoreline erosion. NCI was retained to evaluate the eroding shoreline and develop a concept for protecting the concrete promenade while still providing water access for the windsurfers. NCI also prepared a construction cost estimate. The recommended plan consisted of installing 6,240 square feet of concrete erosion control mats over 416 lineal feet of beach, protecting the flanks with rock riprap, and removing 18 timber pile stubs that created a shallow water safety hazard. The contract bid was developed for a base bid of 4,800 square feet to ensure that the construction budget would not be exceeded. NCI also provided construction inspection to oversee installation of the selected Armorflex concrete mat system.

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Strawberry Point Shoreline Protection, Mill Valley, CA.

Shoreline protection and public shoreline access were provided for a new residential waterfront development on Richardson Bay, located within San Francisco Bay. NCI performed the engineering analysis, evaluation of shoreline alternatives, and final design for a stone revetment structure. The final design consisted of two revetment walls: one along the shoreline's edge to allow some overtopping onto the public access path, and the second wall buried landward of the public access path to provide ultimate protection during extreme events.

San Luis Rey River Revetment, Oceanside, CA.

An existing concrete slope protection, fronting a residential development along the eastern river bank of the San Luis Rey River, immediately north of Murray Road, experienced severe undermining and damage during high river flow conditions due to insufficient toe depth. NCI's scope of services included analyzing the river/channel bed hydraulic/erosional characteristics; performing the engineering design for an improved revetment structure designed to meet Standard Project Flood criteria; preparing construction drawings, specifications and contract documents; and providing full time resident inspection and construction management. The new structure consisted of 6,000 lineal feet of stone revetment, including filter rock and geotextile fabric, constructed on a 2:1 (h:v) slope that deepened the existing toe by 15 feet in vertical elevation. Damaged portions of the existing concrete protection were removed, and after reconstruction of the eroded river bank, the new stone revetment was constructed over the lower portion of the remaining existing structure. In addition, existing storm drain lines were improved as required. The contractor utilized a dewatering well point system in order to deepen the new revetment's toe elevation.

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Dana Point Headlands Development & Conservation Plan, Dana Point, CA.

Dana Point Headlands Development & Conservation Plan, Dana Point, CA. This project consisted of the development of 121 acres on the Dana Point Headlands in Dana Point to include; 125 residential lots; a 65-room inn; up to 40,000 square feet of visitor/recreational commercial use; and 62 acres of public open space including 30 acres of conservation area. NCI's extensive involvement included; preparation of coastal engineering assessment; engineering design of a 2200 lineal foot reconstructed revetment with walkways on top; engineering design of various types of retaining walls within the project site; on-site construction inspection; and post-construction beach monitoring.

NCI prepared the coastal engineering assessment for the proposed Headlands Development and Conservation Plan. A baseline description of the local and regional coastal processes was prepared and compared to potential project impacts related to surf zone wave characteristics, cross-shore and alongshore sediment transport, and bluff erosion rates. Impacts associated with reconstruction of the existing revetment structure, reduction of sediment yield, construction of new storm drain outlets, pedestrian walkway and access ramp were also addressed. Mitigation measures to minimize the identified potential impacts were analyzed. NCI worked closely with the client to modify the design features of the reconstructed revetment and various retaining walls within the project's development, and prepared the design calculations, construction plans and specifications. NCI is currently providing construction support to ensure that the contractor meets the requirements of the design specifications for the proposed revetment and retaining walls.

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Emery Point Shoreline Rehabilitation, Emeryville, CA.

NCI prepared the final design and prepared the contract documents for rehabilitation of 670 feet of shoreline protection directly exposed to the entrance to San Francisco Bay.  The design involved two separate sections to account for varying degrees of wave exposure.  One section involved a wide berm to minimize potential wave runup and overtopping.  Other design components included extension of storm drains and inclusion of landscape architectural drawings and specifications into the contract documents.  NCI also provided full time resident inspection.

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