Engineering Disciplines


Services

Inspection of Waterfront & Coastal Facilities

Capital Facilities Depreciation Study, County of Orange, CA.

NCI performed a comprehensive review of the County's urban lake and coastal harbor recreation facilities for the purpose of identifying short-term and long-range budget requirements to preserve and maintain capital improvements. Inspections were conducted of nine lake systems, three coastal harbor facilities, as well as beach access stairways, ocean piers, and miscellaneous waterfront structures. Condition assessments were made for the component structural and utility items at each aquatic facility. Items evaluated included docks, piers, bridges, bulkheads, stairways, dredging, water aeration and circulation systems, lake liners, and associated electrical and mechanical elements. Repair and maintenance liabilities over time were appraised, and capital expenditures were estimated and prioritized by need to identify the County's long-range spending requirements.

Mandalay Bay Seawall, Oxnard, CA.

A comprehensive condition survey of over 32,000 lineal feet of precast and cast-in-place concrete seawall was performed by NCI. Design services included non-destructive and destructive testing, as well as underwater diver inspection, to determine causes of deterioration, selection of repair materials and methodology, and preparation of construction drawings, specifications, and cost estimates. A phased program of repair and preventive maintenance was developed to restore and preserve foundation piling, wall components, and slope protection measures. Full-time resident inspection and construction consultation was also provided.

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Amax Pond Dikes, Great Salt Lake, Utah.

NCI conducted a helicopter inspection of several miles of storm-wave-damaged magnesium evaporation pond dikes, followed by ground inspection of the more serious sections. Based on the assessment of damage, NCI recommended the repair work required to ensure a structurally sound dike system. Repair methodologies were also provided.

Ventura Isle and Anacapa Isle Marinas, Ventura County, CA.

NCI performed a detailed condition review and assessment of two coastal marinas totalling nearly 1,200 slips as part of an overall site appraisal task. A visual survey was conducted to describe the condition of the floating dock systems, utilities, and appurtenant components for determining the extent of repairs or improvements required to restore substandard, damaged, or non-functional items. Itemized construction cost estimates were also furnished.

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Inspection & Condition Assessment of Parcel 47 Marina Docks, Marina del Rey, CA

In June 2008 NCI performed a detailed above water visual inspection and under water diver inspection of the Parcel 47 marina dock facilities in Marina del Rey, CA.  The marina consists of 196 single berths and end tie slips configured over eight main headwalks with slip sizes ranging from 25 feet to 55 feet in length.  These docks are of concrete Unifloat construction with expanded polystyrene foam cores encased in a light-weight concrete shell built in the early 1970s and were over 35 years old at the time of this inspection.  The results of the field inspection were compiled and tabulated into a GIS database for analysis using Microsoft Excel, Access, and ESRI ArcMap software. 

A final assessment of overall condition of a dock component was made upon review of the number of deficiencies noted and the severity of any one item observed with each item given a final evaluation rating.

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Inspection & Assessment of Repair Options for Parcel 47 Marina Docks, Marina del Rey, CA

In November 2009 NCI performed an above water visual inspection of the Parcel 47 marina dock facilities in Marina del Rey, CA. The marina consists of 196 single berths and end tie slips configured over eight main headwalks with slip sizes ranging from 25 feet to 55 feet in length. These docks are of concrete Unifloat construction with expanded polystyrene foam cores encased in a light-weight concrete shell built in the early 1970s and were over 35 years old at the time of this inspection. A comprehensive above water and under water inspection of these docks was previously performed by NCI in mid-2008. Remedial repair options were considered in order to extend the docks life by a few years, however due to their continued deterioration and advanced age complete dock replacement was recommended.

(Deck Deterioration on left) | (Dock 400 Deck Overlay Repair on right)

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Emergency Inspection of the Parcel 47 Marina Docks, Marina del Rey, CA

On March 2, 2010 NCI performed an above water visual inspection of the Parcel 47 marina dock facilities in Marina del Rey, CA in order to observe damages that occurred to the floating docks on February 27, 2010 as a result of the February 26th Chilean magnitude 8.8 earthquake that generated a tsunami event that impacted the coast of California.  Unusual tide fluctuations and strong ebb and flood currents throughout the afternoon and evening hours of February 27th had been reported that day in Marina del Rey which significantly impacted Dock G200 of the Parcel 47 marina. 

Emergency response action was necessary to secure the area, temporarily relocate moored boats to other slips in the marina, determine the full extent of the damages, and assess the feasibility and cost of repairs.  In June 2008 NCI had performed a comprehensive above water and under water visual inspection and condition assessment of the Parcel 47 marina, and in November 2009 had performed an inspection and assessment of repair options.  The tsunami event resulted in the complete failure of the Dock G202 finger with deck cracks and spalls observed throughout the Parcel 47 marina, in addition to the continued deterioration of the docks beyond the 2008 and 2009 inspections.

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Spud Point Marina Breakwater Inspection and Assessment, Bodega Bay, CA.

An approximately 1,300 foot long concrete breakwater was constructed by Santa Rosa County Parks and Recreation in the mid 1980’s to protect a recreational boat marina.  The breakwater consists of precast concrete support and baffle panels, precast concrete plumb and batter piles, a cast-in-place concrete cap, an aluminum access bridge, steel guardrails to allow public access on top of the breakwater, and two timber fishing platforms.  The purpose of the work performed by NCI was to visually inspect the structure for public safety and to visually inspect the structural integrity of the breakwater.  The inspection of the in water portion of the breakwater was to be performed at a tide level no higher than 1-foot MLLW.

Inspections were performed between October 2006 and January 2007.  A report was prepared and submitted that detailed the inspection process, results of the inspections, and provided repair recommendations.  The report was documented with photographs and inspection reports.  In general, there was no current public safety hazard or major structural deficiency with the breakwater.  The inspections found that: the precast concrete components are in excellent condition; cracks are evident and should be repaired in the cast-in-place concrete cap; expansion joint material should be replaced; a few sections of the steel guardrail should be replaced; the steel guardrail should be painted in corroded areas; the timber platforms should be replaced or improved; and the aluminum gangway is in excellent condition.

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Seadrift Lagoon Bulkhead Inspection and Assessment, Stinson Beach, CA

In December 2001 NCI and the Seadrift Association performed a visual inspection by boat of the entire 12,000 plus lineal feet of the Seadrift Lagoon existing timber bulkhead.  A ranking system was developed and utilized to assess the existing bulkhead’s condition fronting each of the 203 lagoon properties.  The original existing bulkhead is of timber construction, and was installed in about the year 1965; therefore its life of over 35 years at the time of inspection already had exceeded an expected lifespan for a structure of this type that is located in a saltwater environment.

Based on our visual survey assessment, the following findings were noted: severest signs of deterioration and failure located in second horizontal plank from top and in vertical posts near the mudline location for all lots with the original bulkhead in place; there were numerous areas throughout the lagoon that were losing landside sediments into the lagoon due to gaps between the horizontal planks, gaps between the bottom plank and mudline, sections of severely deteriorated and missing planks, and/or failed wall conditions; deterioration and rotting of timber bulkhead members had accelerated due to the saltwater environment, weather conditions, change in water level, and extended life of the bulkhead; and there were very few lots with the horizontal bulkhead planking extending below the mudline.

 

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Seadrift Revetment Inspections and Evaluations, Stinson Beach, CA

NCI has performed engineering inspection and evaluation on a routine basis since 1985 to assess the current condition of the existing stone revetment that is 7,500 lineal feet in length fronting 123 properties within the Seadrift development of Stinson Beach.  Our scope of services is in accordance with a California Coastal Commission Permit which states that on a regular basis (at least every other year) for the life of the project, a monitoring report shall be prepared following the winter storm season which will evaluate the effectiveness of the revetment and the impacts of the revetment on the adjacent beach, including the beach profile.  This monitoring report shall also include recommendations for future maintenance and its schedule as well as an assessment of the effectiveness of previous maintenance activities.  If storms of magnitude similar to or greater than the 1982/1983 storms occur, monitoring and inspection shall take place as soon as safely possible following the storm event.

The existing stone revetment was constructed from January through April of 1983.  The entire existing revetment structure experiences continued gradual settlement during times of high waves and tides that severely erode the beach face, since the revetment’s toe was originally constructed on beach sands at about elevation +7 feet MLLW. 

 

 

 

 

Gradually the revetment’s toe is settling to a lower elevation; however, during this settlement process, the revetment requires the additional placement of maintenance stone in order to maintain its overall integrity and to maintain its crest elevation at approximately +17.5 feet MLLW.

 

 

 

 

 

 

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Seadrift Lagoon Bulkhead Design and Construction, Stinson Beach, CA

From 2002 through 2005 NCI performed the following scope of services for the replacement of over 12,000 lineal feet of existing deteriorating timber bulkhead fronting 127 properties on the Seadrift Lagoon with a new bulkhead; initial site inspection and assessment of existing timber bulkhead; preparation of detailed site base map after performing aerial photography/mapping and hydrographical/bathymetric survey; preparation of conceptual new bulkhead layout and plan including detailed report of alternative bulkhead comparisons; participating in numerous stake holder’s meetings to address findings and recommendations; processing and securing all required local, state and federal regulatory permits; preparation of final design, construction drawings, specifications and contract documents; contractor bidding and award of construction contract; and full time construction management and resident engineer inspection.

The new constructed bulkhead consisted of a cantilever coated steel sheet pile bulkhead with a timber waler/cap.  The new bulkhead was installed in the same location as the existing bulkhead as it was being removed.  All construction work involving the removal of the existing bulkhead and installation of the new bulkhead was performed from the water side utilizing low draft flexi pontoon floats (barges).

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Bolinas Lagoon Bulkhead Inspection & Assessment of Alternatives, Stinson Beach, CA

In February 2006 NCI performed a cursory visual site inspection of the existing timber bulkhead for ten properties fronting Bolinas Lagoon from 307 Seadrift Road through 329 Seadrift Road (Phase 3 of a bulkhead replacement project).  The original bulkhead of 750 lineal feet in length consisted of a corrugated asbestos sheet pile wall that was anchored by using a timber waler, timber cap, steel rod or steel cable tie rods that were secured to buried horizontally-placed timber pile deadmen.  It is believed that this original existing asbestos sheet pile bulkhead was constructed in the 1950s.  When the vertical asbestos-placed sheet piles began failing many years ago, this existing bulkhead was reinforced by placing vertical timber sheet lagging along the water (lagoon) side of the asbestos bulkhead, and was secured to the existing asbestos bulkhead with a timber wale and timber cap.  However, the toe depth of both the asbestos and timber sheet piling did not extend below elevation–6 MLLW, and in some cases may not have even extended to this depth.  This fronting timber wall was constructed during either 1988 or 1989 and was expected to have a lifespan of 10 to 15 years.

The inspection showed that the vertical timber planks had completely deteriorated through in many locations, which was most prevalent below the lower horizontal timber waler.  In addition, the lower horizontal timber waler was starting to experience severe deterioration.   The only reason the bulkhead had not as yet completely failed and collapsed was due to the lateral support still being provided by the older asbestos bulkhead that was directly behind the timber planking.

A site topographic survey, a preliminary engineering evaluation including a site geotechnical investigation previously performed during the Phase 1 project, and constructability review were then performed; and in April 2007 an assessment of bulkhead repair alternatives was prepared.  The proposed bulkhead repair project consisted of installing approximately 750 lineal feet of new bulkhead in the same location as the existing failing bulkhead for these ten properties.  Based on the results of these investigations, it was proposed that the new bulkhead consist of steel interlocking sheet piles driven to a depth of -17 feet NAVD, and that the bulkhead be anchored near its top by installing Chance helical anchors at approximately twelve feet on centers.

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Dana Point East Basin and West Basin Marinas, Dana Point, CA.

NCI was retained by the County of Orange to inspect all waterside improvements for the East and West Basins at Dana Point Harbor, and to recommend required marina rehabilitation work by the existing lessees, including rehabilitation construction phasing and costs. The existing East Basin Marina consists of 29 headwalks with 1466 berths of concrete unifloat construction, and 624 steel guide piles, while the existing West Basin Marina consists of 964 berths of concrete T-dock construction, and 469 concrete guide piles. Services included performing detailed evaluations and material quantity take-offs of the 30-year old existing marinas, and the recommendation of new marina layouts utilizing new concrete dock systems including improved marina amenities.

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