statement of qualifications dams & water resources engineering · statement of qualifications...
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Corporate Headquarters500 Penn Center Boulevard, Pittsburgh, PA 15235 USA
Telephone: 412.856.9700 | Fax: 412.856.9749
Statement of QualificationsDAMS & WATER
RESOURCES ENGINEERING
Civil Engineering: Site Layout and Design; Roadway and Intersection Design; Surveying; Drainage; and Storm Runoff Analysis and Design.
Construction Management: Cost Estimating and Scheduling; Quality Control/Quality Assurance; Construction Monitoring and Inspection; Value Engineering; Claim Analysis and Negotiation; and Agency Coordination.
OUR CORPORATE COMMITMENTRIZZO takes great pride in our commitment to providing personal and professional services in a responsive, high-quality manner. There is no doubt that our services are a direct reflection of our individual capabilities, personalities, and experiences. Consequently, we strive to build client/consultant relationships that are mutually rewarding.Establishing close relationships with our clients is a key element to reaching total solutions. We cultivate each client relationship from the initial concept to completion, often maintaining this contact years after a project is finished.
We believe successful consulting is achieved through a balance of significant experience, a working knowledge of today’s best practices, and access to cutting edge technology. We offer expertise that goes beyond “state of the practice,” to include innovative solutions using techniques usually found in academic and research institutions. Accordingly, we take a proactive approach to staff recruitment and development, and maintain close ties to universities and national laboratories.
GLOBAL EXPERIENCERIZZO personnel have been building up national and international relationships for several decades. We have worked on sites throughout the United States, South America, Europe, the Middle East, Africa, Australia, and Asia. We have been exposed to a variety of site conditions
Founded in 1984, RIZZO Associates has grown into an award-winning engineering and consulting firm specializing in Geotechnical Engineering, Water Resources Engineering, Dam Analysis and Design, and Construction Management. RIZZO’s Founder and President, Dr. Paul C. Rizzo, P.E., has built the firm into one of the leading consultants in seismic safety of dams and other structures. He is recognized globally as an expert in the field of safety evaluations and seismic rehabilitation of dams.
RIZZO currently employs more than 300 engineers, scientists and technicians around the world, many with advanced degrees in their respective areas of expertise. Company headquarters are located in Pittsburgh, Pennsylvania, with offices in Columbia, South Carolina; St. Louis, Missouri; Oakland, California; and Tarrytown, New York. RIZZO also has affiliate and branch offices located in Tucson, Arizona; Australia, The Czech Republic; Russia; South Africa; South America; and the United Arab Emirates, serving local clients.
The technical focus and majority of RIZZO’s experience and expertise is primarily in the following practice areas:
Geotechnical Engineering: Investigation Planning, Implementation, and Results Analysis; Ground Improvement Techniques; Slope Stability; Soil-Structure Interaction; Hydrogeology; Liquefaction Potential; Instrumentation and Monitoring; and Hazard Remediation.
Water Resources Engineering: Dam Inspection, Analysis, and Design; Water and Waste Water Conveyance/Transmission and Storage; Analysis and Design for Impoundment Structures and Watershed Comprehensive Studies and Plans.
Structural Engineering: Deep and Shallow Foundation Design; Comprehensive Seismic Load Development, Analysis, and Design; Special/Unique Structure Analysis and Design; and Nuclear Power Plant Structure and Equipment Analysis and Qualification.
COMPANY HISTORY
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1.0 COMPANY HISTORYbecause of our international project exposure. We have faced many unusual situations, including access problems, adversary adjacent property owners, political strife, and public hearings in several languages. We have served a variety of clients, including various governments, global companies, multinational corporations, and international lending agencies and banks.
QUALITY ASSURANCERIZZO has a fully implemented internal Quality Assurance/Quality Control System, established and qualified in accordance with the requirements of the American Society of Mechanical Engineers, (ASME) NQA-1-1994, “Quality Assurance Requirements for Nuclear Facility Applications,” NQA-1-2008 (and the NQA-1a-2009 Addenda), “Quality Assurance Requirements for Nuclear Facility Applications” Standard. The Standard was selected as the basis for our QA Program because it establishes quality assurance standards for activities ranging from data acquisition through design to records administration. Particular emphasis is placed on documentation and verification procedures for field operations, and for analysis and calculations, which result in traceability and transparency.Within the last four years, the RIZZO QA Program has been audited by at least 10 clients as part of their supplier approval process.
RIzzO’S EXPERTISEMany of our engineers and scientists are registered professionals with advanced degrees in their respective fields of study. RIZZO senior engineers routinely mentor our emerging engineers to ensure that we provide an unwavering level of service. We embrace a hands-on approach with our projects, staff, and clients, and we believe that this blend of seasoned engineering experts, and bright, young talent, is essential when engineering for the future!
lower St. Anthony Falls
Gilboa Dam remediation
osage Hydroelectric Project
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DAM SAfETY EVALUATIONS & INSPECTIONSRIZZO has performed dam safety evaluations including inspections, investigations, feasibility studies, and new and remedial designs for the following types of dams:
•Earth fill; •Rock fill;•Concrete gravity; •RCC;•Water Supply and Waste Water Impoundments•Ambursen or buttress; and•Timber Crib.
RIZZO’s staff has performed numerous dam safety inspections for dams owned by electric utilities, state agencies, government authorities, and private owners. These inspections include:
•Federal Energy Regulatory Commission (FERC) Part 12D;•FERC Low Hazard Annual Operation;•State; and•U.S. Environmental Protection Agency (USEPA) Coal
Combustion Waste Impoundments.
We have also performed emergency dam safety inspections at several dam sites after a flood event. Our staff currently includes four FERC-approved Part 12 Dam Safety Independent Consultants (Paul Rizzo, Hans Hasnay, John Osterle, and Bill Broderick).
DAM SAfETY PROGRAMS RIZZO has developed and assisted utility companies with Dam Safety Programs, including conducting dam safety training sessions for utility company employees and inspection programs for utility
RIZZO personnel have been involved in dams, hydroelectric projects and water supply projects for more than 50 years, including feasibility studies; design and construction services; remediation projects; inspection services, including FERC Part 12 Inspection; and navigation structures. RIZZO has extensive experience with Dam and Water Resources Engineering particularly throughout the Eastern Region and across the United States. We have also worked on numerous overseas projects, primarily in South America, Europe, Southeast Asia and Australia.
RIZZO’s experience includes working on all types of dams, and impoundments, including earth fill, concrete gravity, timber crib, Roller Compacted Concrete (RCC), Ambursen, and special projects, such as navigation structures.
In particular, RIZZO has extensive experience in the following areas:
•Embankment dams and their behavior, including seismic performance;
•RCC dam design, including mix designs;• Investigation of all types of dam soils and foundations;•Hydrology and Geological studies;•Foundation improvement, including grouting and
cutoff walls;•Seismic hazard analysis and seismic design and
analysis;•Dewatering system design; and•Conceptual to final design on all types of dams;
RIZZO has routinely performed the following services on dams:
•Preparation and implementation of an Emergency Action Plan;
•Formal dam inspections in accordance with Federal Guidelines for Dam Safety; and
•Flood analysis.
DAMS & WATER RESOURCES EXPERIENCE
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Browns reservoir Dam
Bee Bee island Dam
Saluda Waste Water Pond Construction
2.0 DAMS & WATER RESOURCES EXPERIENCEfacilities. RIZZO’s dam safety experience also includes the preparation of Surveillance and Monitoring Programs, Surveillance and Monitoring Reports, Supporting Technical Information Documents, and Emergency Action Plans (EAPs). Several of our senior staff members have performed table top dam safety exercises in accordance with Federal Emergency Management Agency (FEMA) guidelines while employed with an electric utility company. RIZZO personnel also have experience with support of Owners regarding ongoing dam safety issues. Examples include: compilation and evaluation of instrumentation data; preparation of inspection checklists and reports; and performance of regularly scheduled inspections.
Additionally, RIZZO developed a Dam Safety Performance Monitoring and Data Analysis Best Practices document for the CEATI Dam Safety Interest Group.
PfMA REPORTSWe have also facilitated and participated in Potential Failure Mode Analysis (PFMA) sessions for FERC-licensed and state-licensed dams, including the preparation of PFMA reports. We currently have two FERC-approved PFMA facilitators.
INSTRUMENTATION & MONITORINGRIZZO has extensive experience with the design, installation, and data evaluation of dam safety instrumentation for both existing and new dams. This experience includes the installation, operation, and monitoring of piezometers (vibrating wire and Casagrande), inclinometers, survey monuments, seepage flumes, and crack meters.
We recently prepared and supervised the instrumentation and monitoring program for the refilling of the Taum Sauk Upper Reservoir Dam. We also performed extensive instrumentation monitoring for the Saluda Dam Remediation, Wyaralong Dam Construction and the Bear Creek Project.
STABILITY ANALYSESRIZZO routinely performs static and dynamic stability analyses for earth embankment, rock fill, and gravity dams. We have also performed numerous seepage and slope stability analyses for large excavations located adjacent to dams and other water resources facilities. We also perform two-dimensional static and dynamic finite element analyses for both gravity and embankment dams. Dynamic stability analyses for earth embankment dams typically includes: performing seismic risk analyses; liquefaction potential studies; and deformation analyses. RIZZO staff has the capabilities to perform all of these services in-house without support from external consultants or subcontractors.
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2.0 DAMS & WATER RESOURCES EXPERIENCEGEOLOGIC & GEOTECHNICAL INVESTIGATIONS We also routinely perform and/or oversee comprehensive geological and geotechnical investigations for all types of dams and water resources structures. We can also perform on-site pumping tests to provide the data necessary to design a dewatering system or to provide the data required in seepage analyses.
PMf STUDIES Our water resources experience includes performing site-specific Probable Maximum Flood (PMF) studies for dams that have watershed areas ranging from several square miles to over 14,000 square miles. We have also performed dam break analyses for both concrete and earth embankment dams and prepared the associated inundation maps.
REMEDIAL DESIGNSRIZZO has developed numerous remedial designs for dams and water resources structures to bring them into compliance with current stability criteria for PMF or earthquake loading conditions. Most of these projects have included the preparation of Design Guides to perform the work. In fact, RIZZO designed two of the largest dam remediation designs in the United States within the last ten years, Saluda Dam Remediation and the Taum Sauk Upper Reservoir Rebuild. The Saluda Dam Remediation and several other remedial designs have included performing seepage analyses for the design of a dewatering system required for construction. RIZZO also provided initial design through Construction Management services for the Taum Sauk Upper Reservoir Rebuild and the Saluda Dam Remediation. We have also developed remedial designs for smaller projects typically consisting of post-tensioned anchor installation, spillway construction or remediation, spillway gate repair or replacement, grouting, or rock fill berm construction.
fEASIBILITY STUDIESRIZZO has performed numerous feasibility studies for dams and water resources projects, many which have gone to final design and construction. Two of our most recent projects to achieve this status include the Lake Livingston Hydroelectric Project, a 24 MW run-of-river dam located in Polk and Livingston Counties, Texas, and Lower St. Anthony Falls, a 10 MW run-of-river hydroelectric plant located in Minneapolis, Minnesota.
lake livingston Hydroelectric Project
Saluda Dam rCC Placement
Santee Cooper Hydroelectric Project
Hydroelectric plant in the late 1980s and developed plans for large head gates at the Osage Project. In 2009 we developed preliminary designs for three minimum flow turbines, a start up of a decommissioned 5 MW unit, two turbine upgrades and a powerhouse extension with a new 6 MW unit for the Mongaup Valley Projects in upstate New York.
RIZZO has performed several feasibility studies for the construction of new hydroelectric projects in the U.S., and throughout the world.
HYDROLOGIC & HYDRAULIC ANALYSISEngineers at RIZZO routinely perform hydrologic and hydraulic analysis of river systems to determine the PMF and Inflow Design Floods and perform dam break analyses. Recently RIZZO performed a revised PMF study for the Osage Hydroelectric Project in accordance with current FERC methodologies. We developed hydrologic response models using the HEC-HMS program for the entire 14,000 square-mile watershed area above the Dam. The watershed extends from central Missouri into eastern Kansas.
RIZZO uses ARC-GIS, ARC-HYDRO, and HEC-GeoHMS with digital topography maps to develop a sophisticated and accurate Hydrologic Runoff and Reservoir Model. We generate Probable Maximum Precipitation (PMP) rainfall distributions using HMR-52 methodologies, and perform evaluations of watershed soils, surface cover, infiltration, runoff, and baseflow and develop related modeling parameters.
RIZZO has extensive experience in the Hydroelectric Industry. Senior members of our staff have been involved in the industry for over 45 years. RIZZO’s experience includes: the evaluation of powerhouse structures, gates and valves; penstocks; hydroelectric equipment and controls; performing feasibility studies for new facilities; licensing and permitting; construction management; operation; the development of remedial measures; and upgrades for the repowering of existing facilities.
THE ELECTRIC UTILITY INDUSTRY RIZZO has three current staff members (Hans Hasnay, Bill Broderick, and Charlie Weatherford) with over 20 years of experience in the electric utility industry. These individuals possess an owner’s perspective that is unique to consulting firms serving the dam industry. Dr. Rizzo is a minority owner in the Youghiogheny Hydroelectric Project, a 12 MW facility located in Confluence, Pennsylvania, so he is also familiar with the issues and challenges facing the Owners of hydroelectric facilities.
RIZZO currently has Five-Year On-Call Service Agreements with the New York Power Authority.
REMEDIAL DESIGN fOR PENSTOCKSRIZZO has developed remedial designs for several large diameter steel penstocks over the past 20 years including the penstock at TVA’s Blue Ridge Hydroelectric plant in Georgia and the penstock at Entergy’s Carpenter Dam in Arkansas. We also developed remedial designs for the penstock at the Taum Sauk Pumped Storage Plant in Missouri, and the penstock at Swinging Bridge Dam in New York.
POWERHOUSE DESIGNRIZZO has experience in the design of new powerhouses as well as the design of upgrades to existing powerhouses. RIZZO designed the powerhouse for the Youghiogheny
HYDROELECTRIC INDUSTRY EXPERIENCE
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RIZZO has extensive experience and capabilities in the field of dam and water resources engineering and regularly attends and publishes papers for conferences, including: USSD, ASDSO, Hydrovision, and ICOLD.
This section presents two matrices that summarize RIZZO’s experience by projects, including:
1. Dam Experience Matrix, which presents a select list of relevant RIZZO projects and the services we have provided; and
2. Dam Inspection Matrix, which provides a list of RIZZO’s dam inspection projects along with an indication of the type of inspection performed (i.e., FERC Part 12, State, Owners, Coal Combustion Waste Impoundment, etc.) for each project.
Project descriptions for key RIZZO dams and water resources projects are included in Section 5.0.
RIzzO PROJECT EXPERIENCE
Saluda Waste Water Pond
Pleasure lake Dam Construction
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SELECT PROJECT EXPERIENCE MATRIX
4.0 RIzzO PROJECT EXPERIENCE
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4.0 RIzzO PROJECT EXPERIENCE
DAM INSPECTION MATRIX
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4.0 RIzzO PROJECT EXPERIENCE
DAM INSPECTION MATRIX CONTINUED
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DAM INSPECTION MATRIX CONTINUED
4.0 RIzzO PROJECT EXPERIENCE
presented various design alternatives to both the FERC and the BOC for review and approval.
ENVIRONMENTAL REPORT In order to obtain regulatory approval for the Project, RIZZO conducted a complete Environmental Impact Report for both the Rebuild and the potential consequences of an engineered Overflow Release Structure, which was designed to prevent a catastrophic release down Proffit Mountain to Taum Sauk Creek in a preferential direction so as to minimize human and environmental impact. The Environmental Report was subject to public meetings and significant coordination with the regulatory agencies. RIZZO also developed the required environmental permits for protection of water and control of air emissions.
PENSTOCK INSPECTION RIZZO performed the inspection of the outlet works for the Taum Sauk pumped storage facility and prepared the associated inspection report. The outlet works consists of a 450-ft. long, 26-ft. diameter vertical shaft, a 4,765-ft. long, 25-ft. diameter horizontal rock tunnel, and a 1,807-ft. long, 18.5-ft. diameter steel lined tunnel and penstock. Inspection activities included a scan of the vertical shaft using a video camera and Ground Penetrating Radar and a visual inspection and geologic mapping in the rock tunnel. The steel lined tunnel and penstock were visually inspected, thickness readings were taken using an Ultrasonic Thickness meter, and ovality checks were performed by a surveyor.
TUNNEL LINER REPAIR The outlet works for the Taum Sauk pumped storage facility includes an 1,807-ft. long, 18.5-ft. diameter steel lined tunnel and penstock. A section of the steel lined tunnel buckled and cracked several times during previous dewatering of the outlet works. RIZZO developed a design for patching and rehabilitating the section of the steel lined
Ameren Missouri contracted RIZZO to provide the forensic analysis to determine the root cause for the failed Upper Reservoir at the Taum Sauk Pumped Storage Facility. RIZZO then performed conceptual, and then a detailed design of the new dam, in addition to managing the construction of this $380 million rebuild. The selected rebuild consisted of constructing an RCC dam and all ancillary components. The final Project involved the placement of 2.7 million cubic yards of RCC. During construction, the Taum Sauk Upper Reservoir was the largest RCC dam under construction in the U.S. The Taum Sauk Upper Reservoir Rebuild Project won the 2010 USSD Award of Excellence for Construction Projects. RIZZO’s scope of work is detailed as follows:
fORENSIC ANALYSISRIZZO conducted a detailed forensic engineering analysis to determine the cause of the failure. Analysis included stability and seepage, dam breach (to determine time and to evaluate mode of failure), complete review of instrument control systems, sediment transport, detailed mapping of breach zone, drilling and sampling of remaining portions of the dike, and a subsurface investigation to analyze both the existing dike and its foundation and the potential foundation of a new dam.
DESIGN ENGINEERING RIZZO prepared both conceptual and detailed designs for the Rebuild, including analyzing and developing various options to rebuild the Project. Construction costs and schedule, as well as potential regulatory challenges with each option, were fully evaluated. RIZZO evaluated several alternates for the rebuild and selected a symmetrical (0.6H to 1.0 V upstream and downstream) RCC dam. RIZZO developed an appropriate seismic design basis for the site and completed a series of finite element analyses to predict seismic stresses during a design basis earthquake event. All calculations, design reports, and construction documents were reviewed by the FERC and an Independent Board of Consultants (BOC). RIZZO formally
TAUM SAUK UPPER RESERVOIRreBUilD ProJeCT
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tunnel that had experienced buckling. New patch plates were installed. The design also included transition sections and a new drainage system to relieve external pressure. RIZZO prepared a bid package and provided construction management during repair.
CONSTRUCTION MANAGEMENTAs Construction Manager (CM), RIZZO retained a full staff of on-site personnel, including: engineers, construction supervisors, AutoCAD personnel, surveyors, and environmental compliance and safety personnel. RIZZO was the single point of contact for the Project and was the Owner’s Representative on-site. Additional duties included coordinating and managing the work of the Contractor.
RIZZO’s responsibilities included: scheduling, budget and cost control, inspection of the Contractor’s work, approval of Pay Applications, contract administration, preparation of contract documents and technical specifications, health and safety programs, Request for Information and approval of Project Submittals. RIZZO provided on-site supervision and coordination of all construction activities. These activities included schedule, budget and cost control, approval of submittals, responses to RFIs, Cost Estimates, preparation of Bid Documents, Contract Administration, Document Control, Construction Monitoring, Cash Flow Projections, review of Value Engineering proposals, Claim Analysis and Negotiation, Dispute Resolution, Performance Analysis, and Payment Application Approvals.
The Taum Sauk project highlights RIZZO’s experience with the following tasks:
•Structural and Dynamic Stability Analysis;
•Embankment Stability Analysis;
•Deformation Analysis;
•Seepage Analysis;
•Seismic Analysis;
•Dam Break Analysis;
•Potential Failure Mode Analysis;
•Comprehensive Geological and Geotechnical Investigations;
•Design Plans and Specifications for modifications;
•Guiderail Design and Installation Inspection for Access Road and Top of Reservoir – 7000 feet.
•Highway Reconstruction Pavement and Guiderail – 6 Miles.
• Instrumentation Design and Monitoring;
•Drafting Services;
•Formwork Design, Concrete and Embedded Items Inspection
•Formal, Intermediate, Emergency, and Special Dam Safety Inspections;
•RCC Mix Design and Placement Means and Methods;
•RCC and Conventional Concrete Inspection and On-site Testing
•Grout Program Design; and
•Overall Construction Oversight and Support.
Total Project Cost: $380 MillionRIZZO Contract: $40 Million Point of Contact: Mr. Thomas Hollenkamp Ameren Missouri
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5.0 PROJECT DESCRIPTIONS
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of multiple ash-ponds, replacement of 6-ft. diameter pipes, which delivered cooling water to the on-site coal-fired plant, access roads, guiderails and new highway pavement construction across the dam, and operation and closure of an ash landfill. Replacement of the pipes involved tapping into penstocks, supplying water to the Hydropower Station, and required outage of both plants.
To minimize economical losses, a tightly choreographed sequence of steps was developed for the pipe replacement. The project was multifaceted with an aggressive schedule, with more than 350 people working on site around the clock. The new dam was built immediately downstream of the existing dam. Excavation at the toe of a high-hazard dam with full reservoir was a very dangerous undertaking. RIZZO designed and supervised an extensive dewatering program with over 1,500 wells working non-stop to lower ground water levels and facilitate excavation.
To evaluate effectiveness of the dewatering system and monitor dam safety during excavation, hundreds of fully-automated inclinometers and piezometers were installed in the dam. These instruments provided a continuous real-time stream of data and helped engineers to make timely decisions about safety and progress of construction. The Instrumentation and Monitoring Program was highly praised by industry experts and federal regulators.
With space constraints precluding open-cut excavation, several retaining walls were required to support the 50-ft. deep excavation for the new dam. The project included construction of a 1,500-ft. long and 40-ft. high tie-back retaining wall, a 45-ft. high soil bentonite cut-off wall, a 40-ft. high soil-nail wall, and a local jet-grouted wall. Because of highly irregular and often unpredictable bedrock profile, the wall designs had to be revised in several instances. RIZZO worked closely with the contractor value-engineering the walls to fit site conditions. This close cooperation allowed the construction to progress with no delays, despite difficult
RIZZO was retained by South Carolina Electric & Gas (SCE&G) as the Design Engineer and Construction Manager for the remediation of Saluda Dam, located in Columbia, South Carolina. The $275 Million Project was completed in 2005 and, at that time, was the largest active dam construction project in the U.S. The Saluda Dam received the Outstanding Civil Engineering Achievement (OCEA) as the most outstanding project for 2006 as chosen by the American Society of Civil Engineers (ASCE).
The Saluda Dam, which impounds Lake Murray, is owned and operated by SCE&G, and is located on the Saluda River, 10 miles upstream of Columbia, South Carolina. With more than 500 miles of shoreline, water area covering about 78 sq. miles, and storage capacity of more than 2,100,000 ac-ft. of water, Lake Murray is one of the largest man-made lakes in North America. The dam, completed in 1930, is 211-ft. high and 7,800-ft. long. It was originally constructed for hydroelectric generation, but today the lake is also the source of cooling water for the coal-fired McMeekin Steam Electric Plant, a source of drinking water for the region and the largest recreation facility in Western South Carolina.
The Saluda Dam has undergone several renovations since its construction. The most recent renovation is a seismic upgrade to comply with current Federal regulations. RIZZO, with input from a Board of Consultants and FERC, evaluated alternatives for the remediation and decided on a large backup dam as the most feasible and cost effective solution. The new 211-ft. tall structure is a combination of rockfill and RCC dams. The new dam was designed to prevent catastrophic flooding and to ensure the safe shutdown of the associated hydro and fossil stations. While construction of the 5,500-ft. long rockfill section was a major effort, the most challenging and innovative aspect of the project dealt with constructing the 2,300-ft. long RCC section in a narrow corridor, between the existing Dam and existing facilities.
In addition to the dam construction itself, the project entailed development of an on-site quarry, excavation
SALUDA DAMremeDiATion ProJeCT
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5.0 PROJECT DESCRIPTIONS
site conditions and shortage of materials due to a tight steel market.
Construction of the rockfill portion of the dam entailed placement of 3.5 million cubic yards of soils and rock. The RCC section for the dam required 1.3 million cubic yards of RCC and mass concrete. All materials were produced on-site. Daily blasting in the quarry, supervised by RIZZO geologists, produced rock for the construction. Shot rock was then delivered to the on-site crushing plants, which supplied various aggregates for the RCC, rockfill, and filters.
Two Aran RCC mixing plants, with 500 cubic yards/hour capacity, each provided RCC and mass concrete. Due to the hot climate, extensive chilling was required. Seven chillers, each with a 230-ton capacity, cooled aggregate and water for the RCC mix. At the peak placement in November 2004, approximately 18,600 cubic yards of RCC was placed in a 24-hour period, establishing the new world record. RIZZO provided Construction Management (CM) services for the project that included coordination of all construction activities.
In addition, a 15 million gallon lined waste water pond was designed and constructed. The pond was constructed to capture eroded or disturbed soil that was washed off during construction and rainstorms and to protect the water quality of the adjacent Saluda River. It was also equiped with an overflow structure and flume to control the discharge. The pond is used for the permanent stormwater management system of the site since the project’s completion.
RIZZO was the single point of contact for the project and provided CM services that included a Document Control System, schedule responses to RFIs, cost estimates for extra work, preparation of initial bid documents, contract administration, construction monitoring of all activities, cash flow projections, review of Value Engineering proposals, claim analysis and negotiation, dispute resolution, performance analysis, and payment application approvals. RIZZO personnel numbered approximately 30 people and included engineers, geologists, surveyors, design and CADD personnel, construction supervisors, RCC supervisors, environmental compliance personnel, safety personnel, and instrumentation engineers and technician monitors.
The Saluda project highlights RIZZO experience with the following tasks:
•Structural and Dynamic Stability Analysis;•Embankment Stability Analysis;•Deformation Analysis;•Seepage Analysis;
•Seismic Analysis;•Dam Break Analysis;•Potential Failure Mode Analysis;•Comprehensive Geological & Geotechnical
Investigations;•Design Plans and Specifications for modifications;•Guiderail Design and Installation Inspection for Access
Roads;•Waste Water and Sedimentation Ponds•Highway Reconstruction Pavement & Guiderail – 3 Miles;• Instrumentation Design and Monitoring;•Drafting Services;•Formwork Design, Concrete & Embedded Items
Inspection;•Formal, Intermediate, Emergency, & Special Dam
Safety Inspections;•RCC Mix Design & Placement Means & Methods;•RCC & Conventional Concrete Inspection & On-site
Testing; and •Overall Construction Oversight and Support.
Total Project Cost: $275 MillionRIZZO Contract: $44 MillionPoint of Contact: Mr. James Landreth South Carolina Electric & Gas
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5.0 PROJECT DESCRIPTIONS
The Blue Ridge project highlights RIZZO experience with the following tasks:•Structural and Dynamic Stability Analysis;•Design Plans and Specifications for modifications;• Instrumentation Design and Monitoring;•Drafting Services;•Construction Oversight and Support; and•Seismic Modification Design.
The Blue Ridge Dam, and an associated 22 MW hydroelectric facility, was constructed in 1931 by the Tennessee Electric Power Company (TEPCO) and was acquired by TVA in 1939. The dam was constructed on the Toccoa River and the facility is operated for hydroelectric power generation, flood control, and recreational uses. The dam is approximately 1,050-ft. long at the crest, and 170-ft. high at the maximum section, and was constructed using semi-hydraulic fill construction technology popular in the early 1900s.
TVA retained RIZZO to develop remediation plans for both the penstock and intake tower at the Blue Ridge Dam. A detailed inspection and geotechnical investigation was performed during the 2003 Outage and Lake Drawdown to obtain all necessary information to support detailed designs of the remediation. Several remediation schemes were considered.
The intake tower is a massive reinforced concrete structure about 190-ft. high. Engineering evaluations revealed that the tower may overturn during a Maximum Design Earthquake, potentially affecting the safety of the dam.
A 14-ft. diameter penstock extends through the base of the dam. Before the penstock was put into service, settlement occurred near the centerline of the dam. To prevent additional settlement, a 162-ft. plate girder was placed inside the penstock bridging the settlement area. Additionally, a bulge in the penstock liner occurred due to high-pressure differential when the penstock was initially drained for inspection. To safely dewater the penstock, the reservoir was lowered more than 60 feet below its normal pool elevation, which significantly impacted recreational use and project economics. RIZZO developed the remediation design that eliminated the need for deep reservoir drawdowns and provided a relatively watertight structure that will not compromise the safety of the dam.
BLUE RIDGEreSerVoir ProJeCT
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•RCC Mix Design;•Grout Program Design; and•Construction Oversight and Support.
Total Project Cost: $120 MillionRIZZO Contract: $2.0 Million
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RIZZO was a member company of the Wyaralong Dam Alliance, the Team responsible for design and construction of a new RCC water supply dam located on the Teviot Brook, near the town of Beaudesert in the Logan River Catchment. The dam has been designed to pass flood flows over a centrally placed overflow spillway under normal conditions, and has been designed to withstand full flood and earth quake loading in accordance with the Queensland Dam Safety Management Guidelines, and the Australian National Committee on Large Dams (ANCOLD) Guidelines. The dam consists of an approximately 1,640-ft. long, 164-ft. tall RCC structure.
During the Design Phase of the project, RIZZO’s responsibilities included: stability analysis and optimization of the cross section of the dam; development of RCC design details, including the drainage gallery and instrumentation; design of the foundation treatment and grout program; interpretation of geotechnical data; and development of associated drawings and specifications. RIZZO also performed thermal analysis, finite element analysis, and the preparation of specifications. During the construction phase of the project, RIZZO provided engineering support for ongoing design details, and had full-time personnel on site, providing expertise for the foundation preparation, drilling and grouting, and RCC construction activities.
•The Wyaralong Dam project highlights RIZZO’s experience with the following tasks:
•Structural and Dynamic Stability Analysis;•Seismic Analysis;•Stress Analysis;•Comprehensive Geological and Geotechnical
Investigations;•Design Plans and Specifications for Modifications;• Instrumentation Design and Monitoring;•Drafting Services;
WYRALONG DAMDeSiGn & ConSTrUCTion
RIZZO’s scope included development of the RCC Berm and Cutoff Wall Design and seismic evaluation; preparation of bid documents; construction cost estimates; and construction observation services during the construction of the RCC Berm and the Cutoff Wall.
Point of Contact: Mr. John Duncan Tennessee Valley Authority
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The Tennessee Valley Authority (TVA) selected RIZZO’s approach for the design and construction of a backup RCC dam, addressing ongoing seepage issues and Probable Maximum Flood (PMF) capacity. TVA constructed the dam in 1969 to provide flood control, recreation, water supply, and economic development benefits. The structure consists of an earth dam, a concrete overflow spillway, an intake tower, lined tunnel, and an outlet structure. The dam is approximately 1,200-ft. long at the crest, and 68-ft. high at the maximum section. Seepage through the karst foundation was observed at the downstream toe of the dam after first filling the reservoir in 1969, and has been a continuing issue throughout the life of the project.
The remediation consisted of an RCC reinforcing structure (RCC Berm), located near the toe of the existing embankment dam, including a composite grout curtain-cutoff wall seepage barrier through the karst rock foundation. RIZZO’s scope included the installation and maintenance of instrumentation system components and daily monitoring of the existing embankment during construction.
Monitoring of the existing embankment during excavation of the toe to competent bedrock is a critical component of the project. RIZZO installed a series of inclinometers and piezometers and used existing instrumentation to monitor the response of the existing embankment, underlying alluvial layers, and foundation rock for excavation and dewatering activities.
Numerous stability analyses were completed to represent various headwater and tailwater elevations at different stages of excavation in order to identify critical conditions and appropriate alert levels. Historical piezometer and headwater data have been analyzed and correlated by RIZZO in order to identify the response of the embankment to changes in headwater elevation. RIZZO also provided daily monitoring and assessment of embankment stability, and has provided weekly Monitoring and Instrumentation Reports to the Client during the life of the project.
BEAR CREEK DAMDeSiGn & ConSTrUCTion
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data; assigning shear strength parameters to the subsurface materials; performing slope stability analyses; and developing design drawings and associated technical specifications. Slope stability analyses were performed for several sections of the excavation for the following loading conditions: end of construction, steady seepage, 100-year flood, sudden drawdown, and earthquake. The excavation design had to meet both FERC and USACE stability criteria, and had to be approved by the Owner’s Engineer, Board of Consultants, FERC, and the USACE.
During construction, RIZZO provided embankment safety monitoring training to on-site personnel, directed the performance monitoring of the excavation, and interpreted and reported instrumentation data from the network of 10 inclinometers and 30 vibrating wire piezometers. In addition, RIZZO provided engineering support during large flood events and for changes to the slope and access road configuration as required by changing construction conditions.
The Smithland project highlights RIZZO’s experience with the following tasks:
•Embankment Stability Analysis;
•Seepage Analysis;
•Design Plans and Specifications for Modifications;
•Drafting Services;
•Geotechnical Instrumentation; and
•Performance Monitoring.
RIZZO Contract Amount: $600,000 (est.)Point of Contact: Mr. Mark Hutchins C.J. Mahan Construction Co.
American Municipal Power, Inc. (AMP) is constructing a new hydroelectric generating plant on the Ohio River at the site of the Smithland Dam. RIZZO is designing the excavation and associated dewatering system. The remaining components of the project were designed by other engineers and subcontractors.
The project site is located along the left bank of the Ohio River at mile point 906. The proposed hydroelectric plant will be constructed adjacent to the east side of the weir wall of the dam. The plant will include three (3) turbines with a combined design output of 72 MW. The existing dam is owned by the USACE, and the project will be regulated by the FERC. The projected consists of the following components:
• Marine Cofferdam;
• Slurry Wall;
• Dewatering System;
• Excavation;
• Flooding Structure; and
• Instrumentation.
As part of the dewatering system design, RIZZO conducted pumping tests at the site to better characterize the hydrogeologic properties of the subsurface materials at the site.
The design of the dewatering system including performing two-dimensional seepage analyses using the Seep2D program, and three-dimensional seepage analyses using the MODFLOW program. The results of these analyses were used to design the dewatering system for the project that consisted of the installation of 65 36-inch diameter deep wells.
The excavation design consisted of evaluating the subsurface conditions of the site from existing geotechnical
SMITHLAND HYDROELECTRIC
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