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380-foot-deep secant pile and slurry wall cut off wall system
<br />through the earthen embankment and rock limestone and
<br />dolomite units below the dam. Secant piles were 5 feet in
<br />diameter and slurry walls ranged from 3 feet to 7 feet thick.
<br />Slurry walls ranged from 3 to 7 ft in diameter and were 250 to
<br />380 feet deep. Center Hill Dam was defined by the USACE as
<br />a Megaproject and as the highest priority of any of the high
<br />hazard dams in the United States at the time of construction.
<br />Canton Dam, Canton, OK: Served as GEI’s in house
<br />consultant and senior reviewer for the design of spillway
<br />channel walls and a downstream cutoff wall for an auxiliary
<br />spillway being built through the right abutment to pass the
<br />probable maximum flood. Performed detailed technical
<br />reviews and oversight of the design submittals for slurry walls
<br />supported with permanent tiebacks and worked with design
<br />and construction team to accelerate the schedule and move
<br />quickly through the review cycles, reducing to seven months
<br />the time required to get final approval from the U.S. Army
<br />Corps of Engineers and break ground.
<br />LA Outfall Tunnel, Los Angeles, CA: The Joint Water Control
<br />Pollution Plant (JWPCP) Effluent Outfall Tunnel involved the
<br />construction of a new tunnel from the inland wastewater plant
<br />in the City of Carson to the existing ocean manifold structure
<br />at Royal Palms Beach. The 18 ft diameter tunnel was designed
<br />without an intermediate shaft. Served as the Project Executive
<br />and provided oversight of the design of the 55 ft diameter 115
<br />ft deep unbraced single launch shaft. The design of the shaft
<br />accommodated earth and water loading conditions, jacking
<br />and penetration forces, multiple penetrations, formwork
<br />stresses, and imbalanced loading. The shaft was constructed
<br />using slurry walls and an unreinforced tremie slab excavated
<br />and placed under water. The slurry walls were analyzed
<br />and designed using 3D finite element methods due to the
<br />geometry effects and imbalanced loading. .
<br />DC Clean Rivers CSO Project Division A - Blue Plains Tunnel
<br />Washington, DC: Provided advisory geostructural review
<br />and review for the Program Consulting Organization for the
<br />design of the deep access and retrieval shafts for the tunnel
<br />boring machine. The shafts were constructed using slurry wall
<br />techniques. Additional responsibilities included the review
<br />of instrumentation performance, movement of adjacent
<br />structures, and the quality control of field activities, and
<br />various construction management related services.
<br />Enhanced Nitrogen Removal Facility (ENRF), Blue Plains
<br />Wastewater Treatment Plant, Washington DC: Served as the
<br />technical lead for the design and construction of a structural
<br />slurry wall constructed for the facility. The slurry wall acted
<br />as a temporary and permanent earth support and water
<br />cutoff for the new Nitrogen Removal Facility. Provided the
<br />oversight of a full set of field activities during the construction,
<br />including excavation, concrete placement, slurry design and
<br />management, and slurry wall construction. Both the ENRF and
<br />the Blue Plains Tunnel project at the Blue Plains Wastewater
<br />Treatment Plant were noted in a feature article of ENR on
<br />October 10, 2011.
<br />I395 Capitol Crossing, Washington, DC: Project involved
<br />the air rights closure and construction of a tunnel for a
<br />former recessed roadway through a densely congested and
<br />urban area. Oversaw collection of data used for the design
<br />of earth retention and foundation structures that would be
<br />used to support the excavations and multilevel below ground
<br />parking and office structure. Provided senior oversight for the
<br />geotechnical work and the development of design parameters
<br />for the use in the design and construction of slurry walls,
<br />shallow foundations, and deep foundations. Performed
<br />design analysis for the permanent slurry walls used to support
<br />the existing roadway, design analysis of large footings and
<br />combined mats, lateral load analysis on columns, including
<br />blast and impact loads, and the analysis of the impact of
<br />potential movements on sensitive historical structures.
<br />Performed assessments of the impacts of dewatering
<br />and excavation on adjacent structures and provided
<br />recommendations for enhancements of instrumentation plans.
<br />Performed independent stability assessments of SOE systems,
<br />including global stability analyses related to large scale site
<br />movement. Also performed assessments of loadings of tower
<br />cranes and of bridge girders to accommodate construction
<br />activities.
<br />Columbia University Manhattanville Development, New
<br />York, NY: Served as lead engineer for the trench stability and
<br />design of a bentonite-water slurry support system for the
<br />slurry wall support of excavation for a two city block mixed
<br />use addition to the Columbia University campus. Analyzed
<br />the polymer slurry support of approximately 100 drilled shafts
<br />from Phase I of the project with diameters of six to eight feet
<br />and depths up to 180 feet. Reviewed the planned slurry mix,
<br />means and methods for both the bentonite-water and polymer
<br />slurry systems, and provided recommendation for measures to
<br />control shaft stability. Managed the on-site quality assurance
<br />(QA) of the slurry supported trench operations during
<br />construction as part of the NYC special inspection process, and
<br />provided guidance and recommendations to control trench
<br />stability, including trench design, surcharge loading, and
<br />water elevation control. Through this oversight and interaction
<br />with the client, trench stability issues were eliminated on the
<br />remaining portions of the Phase I and essentially all the Phase
<br />II work.
<br />Robinson Terminal South, Alexandria, VA: Served as the
<br />Engineer of Record for the design of a reinforced deep soil
<br />mix wall that served as a water cutoff and excavation support
<br />system. These soil mix walls allowed for the construction of a
<br />deep below grade parking structure directly adjacent to the
<br />Potomac River. Challenges include soft ground conditions, a
<br />high-water table, plastic clays, urban fill and contaminated
<br />soils, movement control of adjacent structures and utilities,
<br />GEI Consultants | City of Sunny Isles Beach | RFQ 26-07-01 83
<br />Giovanni Bonita, Ph.D, PE, PG
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