Statement of Qualifications DAMS & WATER RESOURCES ENGINEERING

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Corporate Headquarters 500 Penn Center Boulevard, Pittsburgh, PA 15235 USA Telephone: 412.856.9700 | Fax: 412.856.9749 For more information, feel free to contact us at: [email protected] or 412-856-9700 COMPANY HISTORY

Founded in 1984, RIZZO Associates has grown into an Civil Engineering: Site Layout and Design; Roadway and award-winning engineering and consulting firm specializing Intersection Design; Surveying; Drainage; and Storm Runoff in , Water Resources Engineering, Analysis and Design. Dam Analysis and Design, and Construction Management. RIZZO’s Founder and President, Dr. Paul C. Rizzo, P.E., has Construction Management: Cost Estimating built the firm into one of the leading consultants in seismic and Scheduling; Quality Control/Quality Assurance; safety of dams and other structures. He is recognized Construction Monitoring and Inspection; Value globally as an expert in the field of safety evaluations and Engineering; Claim Analysis and Negotiation; and Agency seismic rehabilitation of dams. Coordination.

RIZZO currently employs more than 300 engineers, OUR CORPORATE COMMITMENT scientists and technicians around the world, many with advanced degrees in their respective areas of expertise. RIZZO takes great pride in our commitment to providing Company headquarters are located in Pittsburgh, personal and professional services in a responsive, high- Pennsylvania, with offices in Columbia, South Carolina; quality manner. There is no doubt that our services are a St. Louis, Missouri; Oakland, California; and Tarrytown, direct reflection of our individual capabilities, personalities, New York. RIZZO also has affiliate and branch offices and experiences. Consequently, we strive to build client/ located in Tucson, Arizona; Australia, The Czech Republic; consultant relationships that are mutually rewarding. Russia; South Africa; South America; and the United Arab Establishing close relationships with our clients is a key Emirates, serving local clients. element to reaching total solutions. We cultivate each client relationship from the initial concept to completion, The technical focus and majority of RIZZO’s experience and often maintaining this contact years after a project is expertise is primarily in the following practice areas: finished.

Geotechnical Engineering: Investigation Planning, We believe successful consulting is achieved through a Implementation, and Results Analysis; Ground balance of significant experience, a working knowledge Improvement Techniques; Slope Stability; -Structure of today’s best practices, and access to cutting edge Interaction; ; Liquefaction Potential; technology. We offer expertise that goes beyond “state Instrumentation and Monitoring; and Hazard Remediation. of the practice,” to include innovative solutions using techniques usually found in academic and research Water Resources Engineering: Dam Inspection, institutions. Accordingly, we take a proactive approach to Analysis, and Design; Water and Waste Water Conveyance/ staff recruitment and development, and maintain close ties Transmission and Storage; Analysis and Design for to universities and national laboratories. Impoundment Structures and Watershed Comprehensive Studies and Plans. GLOBAL EXPERIENCE Structural Engineering: Deep and Shallow RIZZO personnel have been building up national and Design; Comprehensive Seismic Load Development, international relationships for several decades. We have Analysis, and Design; Special/Unique Structure Analysis and worked on sites throughout the United States, South Design; and Nuclear Power Plant Structure and Equipment America, Europe, the Middle East, Africa, Australia, and Analysis and Qualification. Asia. We have been exposed to a variety of site conditions

1 1.0 COMPANY HISTORY because of our international project exposure. We have faced many unusual situations, including access problems, Lower St. Anthony Falls 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 ASSURANCE RIZZO 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 Gilboa Dam Remediation 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 EXPERTISE Many 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! Osage Hydroelectric Project

2 DAMS & WATER RESOURCES EXPERIENCE

RIZZO personnel have been involved in dams, DAM SAFETY EVALUATIONS & hydroelectric projects and water supply projects for more than 50 years, including feasibility studies; design and INSPECTIONS construction services; remediation projects; inspection RIZZO has performed dam safety evaluations including services, including FERC Part 12 Inspection; and navigation inspections, investigations, feasibility studies, and new and structures. RIZZO has extensive experience with Dam and remedial designs for the following types of dams: Water Resources Engineering particularly throughout the Eastern Region and across the United States. We have also • Earth fill; worked on numerous overseas projects, primarily in South America, Europe, Southeast Asia and Australia. • Rock fill; • Concrete gravity; RIZZO’s experience includes working on all types of dams, • RCC; and impoundments, including earth fill, concrete gravity, • Water Supply and Waste Water Impoundments timber crib, Roller Compacted Concrete (RCC), Ambursen, and special projects, such as navigation structures. • Ambursen or buttress; and • Timber Crib. In particular, RIZZO has extensive experience in the following areas: RIZZO’s staff has performed numerous dam safety inspections for dams owned by electric utilities, • dams and their behavior, including seismic performance; state agencies, government authorities, and private owners. These inspections include: • RCC dam design, including mix designs; • Investigation of all types of dam and foundations; • Federal Energy Regulatory Commission (FERC) Part 12D; • and Geological studies; • FERC Low Hazard Annual Operation; • Foundation improvement, including grouting and • State; and cutoff walls; • U.S. Environmental Protection Agency (USEPA) Coal • analysis and seismic design and analysis; Combustion Waste Impoundments. • Dewatering system design; and We have also performed emergency dam safety • Conceptual to final design on all types of dams; inspections at several dam sites after a flood event. Our staff currently includes four FERC-approved Part 12 Dam RIZZO has routinely performed the following services on Safety Independent Consultants (Paul Rizzo, Hans Hasnay, dams: John Osterle, and Bill Broderick). • Preparation and implementation of an Emergency Action Plan; DAM SAFETY PROGRAMS • Formal dam inspections in accordance with Federal RIZZO has developed and assisted utility companies Guidelines for Dam Safety; and with Dam Safety Programs, including conducting • Flood analysis. dam safety training sessions for utility company employees and inspection programs for utility

3 2.0 DAMS & WATER RESOURCES EXPERIENCE facilities. RIZZO’s dam safety experience also includes Browns Reservoir Dam 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 REPORTS We 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 & MONITORING RIZZO 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 (vibrating wire and Casagrande), , survey monuments, seepage flumes, and crack meters.

We recently prepared and supervised the instrumentation Bee Bee Island Dam and monitoring program for the refilling of the Taum Sauk Upper Reservoir Dam. We also performed extensive instrumentation monitoring for the Saluda Dam Remediation, Saluda Waste Water Pond Construction Wyaralong Dam Construction and the Bear Creek Project. STABILITY ANALYSES RIZZO 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.

4 2.0 DAMS & WATER RESOURCES EXPERIENCE

GEOLOGIC & GEOTECHNICAL Lake Livingston Hydroelectric Project 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 DESIGNS RIZZO has developed numerous remedial designs for dams and water resources structures to bring them into compliance with current stability criteria for PMF or 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 Saluda Dam RCC Placement 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- Santee Cooper Hydroelectric Project tensioned anchor installation, spillway construction or remediation, spillway gate repair or replacement, grouting, or rock fill berm construction.

FEASIBILITY STUDIES RIZZO 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.

5 HYDROELECTRIC INDUSTRY EXPERIENCE

RIZZO has extensive experience in the Hydroelectric Hydroelectric plant in the late 1980s and developed plans Industry. Senior members of our staff have been involved for large head gates at the Osage Project. In 2009 we in the industry for over 45 years. RIZZO’s experience developed preliminary designs for three minimum flow includes: the evaluation of powerhouse structures, turbines, a start up of a decommissioned 5 MW unit, two gates and valves; penstocks; hydroelectric equipment and turbine upgrades and a powerhouse extension with a new controls; performing feasibility studies for new facilities; 6 MW unit for the Mongaup Valley Projects in upstate New licensing and permitting; construction management; York. operation; the development of remedial measures; and upgrades for the repowering of existing facilities. RIZZO has performed several feasibility studies for the construction of new hydroelectric projects in the U.S., and THE ELECTRIC UTILITY INDUSTRY throughout the world. RIZZO has three current staff members (Hans Hasnay, Bill HYDROLOGIC & HYDRAULIC ANALYSIS Broderick, and Charlie Weatherford) with over 20 years of experience in the electric utility industry. These individuals Engineers at RIZZO routinely perform hydrologic and possess an owner’s perspective that is unique to consulting hydraulic analysis of river systems to determine the firms serving the dam industry. Dr. Rizzo is a minority PMF and Inflow Design Floods and perform dam break owner in the Youghiogheny Hydroelectric Project, a 12 MW analyses. Recently RIZZO performed a revised PMF study facility located in Confluence, Pennsylvania, so he is also for the Osage Hydroelectric Project in accordance with familiar with the issues and challenges facing the Owners current FERC methodologies. We developed hydrologic of hydroelectric facilities. response models using the HEC-HMS program for the entire 14,000 square-mile watershed area above the Dam. RIZZO currently has Five-Year On-Call Service Agreements The watershed extends from central Missouri into eastern with the New York Power Authority. Kansas.

REMEDIAL DESIGN FOR PENSTOCKS RIZZO uses ARC-GIS, ARC-HYDRO, and HEC-GeoHMS with digital topography maps to develop a sophisticated and RIZZO has developed remedial designs for several large accurate Hydrologic Runoff and Reservoir Model. We diameter steel penstocks over the past 20 years including generate Probable Maximum Precipitation (PMP) rainfall the penstock at TVA’s Blue Ridge Hydroelectric plant in distributions using HMR-52 methodologies, and perform Georgia and the penstock at Entergy’s Carpenter Dam evaluations of watershed soils, surface cover, , in Arkansas. We also developed remedial designs for runoff, and baseflow and develop related modeling the penstock at the Taum Sauk Pumped Storage Plant in parameters. Missouri, and the penstock at Swinging Bridge Dam in New York.

POWERHOUSE DESIGN RIZZO has experience in the design of new powerhouses as as the design of upgrades to existing powerhouses. RIZZO designed the powerhouse for the Youghiogheny

6 RIZZO PROJECT EXPERIENCE

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. Saluda Waste Water Pond 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.

Pleasure Lake Dam Construction

7 4.0 RIZZO PROJECT EXPERIENCE

SELECT PROJECT EXPERIENCE MATRIX

8 4.0 RIZZO PROJECT EXPERIENCE

DAM INSPECTION MATRIX

9 4.0 RIZZO PROJECT EXPERIENCE

DAM INSPECTION MATRIX CONTINUED

10 4.0 RIZZO PROJECT EXPERIENCE

DAM INSPECTION MATRIX CONTINUED

11 TAUM SAUK UPPER RESERVOIR REBUILD PROJECT

Ameren Missouri contracted RIZZO to provide the forensic presented various design alternatives to both the FERC and analysis to determine the root cause for the failed Upper the BOC for review and approval. Reservoir at the Taum Sauk Pumped Storage Facility. RIZZO then performed conceptual, and then a detailed design of Environmental Report the new dam, in addition to managing the construction of this $380 million rebuild. The selected rebuild consisted of In order to obtain regulatory approval for the Project, constructing an RCC dam and all ancillary components. The RIZZO conducted a complete Environmental Impact Report final Project involved the placement of 2.7 million cubic for both the Rebuild and the potential consequences of yards of RCC. During construction, the Taum Sauk Upper an engineered Overflow Release Structure, which was Reservoir was the largest RCC dam under construction in designed to prevent a catastrophic release down Proffit the U.S. The Taum Sauk Upper Reservoir Rebuild Project Mountain to Taum Sauk Creek in a preferential direction won the 2010 USSD Award of Excellence for Construction so as to minimize human and environmental impact. The Projects. RIZZO’s scope of work is detailed as follows: Environmental Report was subject to public meetings and significant coordination with the regulatory agencies. RIZZO Forensic Analysis also developed the required environmental permits for protection of water and control of air emissions. RIZZO conducted a detailed forensic engineering analysis to determine the cause of the failure. Analysis included Penstock Inspection stability and seepage, dam breach (to determine time and to evaluate mode of failure), complete review of RIZZO performed the inspection of the outlet works for instrument control systems, sediment transport, detailed the Taum Sauk pumped storage facility and prepared the mapping of breach zone, drilling and sampling of remaining associated inspection report. The outlet works consists portions of the dike, and a subsurface investigation to of a 450-ft. long, 26-ft. diameter vertical shaft, a 4,765- analyze both the existing dike and its foundation and the ft. long, 25-ft. diameter horizontal rock , and a potential foundation of a new dam. 1,807-ft. long, 18.5-ft. diameter steel lined tunnel and penstock. Inspection activities included a scan of the Design Engineering vertical shaft using a video camera and Ground Penetrating Radar and a visual inspection and geologic mapping in RIZZO prepared both conceptual and detailed designs for the rock tunnel. The steel lined tunnel and penstock were the Rebuild, including analyzing and developing various visually inspected, thickness readings were taken using options to rebuild the Project. Construction costs and an Ultrasonic Thickness meter, and ovality checks were schedule, as well as potential regulatory challenges with performed by a surveyor. each option, were fully evaluated. RIZZO evaluated several alternates for the rebuild and selected a symmetrical Tunnel Liner Repair (0.6H to 1.0 V upstream and downstream) RCC dam. RIZZO developed an appropriate seismic design basis for the The outlet works for the Taum Sauk pumped storage site and completed a series of finite element analyses to facility includes an 1,807-ft. long, 18.5-ft. diameter steel predict seismic stresses during a design basis earthquake lined tunnel and penstock. A section of the steel lined event. All calculations, design reports, and construction tunnel buckled and cracked several times during previous documents were reviewed by the FERC and an dewatering of the outlet works. RIZZO developed a design Independent Board of Consultants (BOC). RIZZO formally for patching and rehabilitating the section of the steel lined

12 5.0 PROJECT DESCRIPTIONS tunnel that had experienced buckling. New patch plates • Deformation Analysis; were installed. The design also included transition sections and a new drainage system to relieve external pressure. • Seepage Analysis; RIZZO prepared a bid package and provided construction • Seismic Analysis; management during repair. • Dam Break Analysis; Construction Management • Potential Failure Mode Analysis; As Construction Manager (CM), RIZZO retained a full staff • Comprehensive Geological and Geotechnical Investigations; of on-site personnel, including: engineers, construction • Design Plans and Specifications for modifications; supervisors, AutoCAD personnel, surveyors, and environmental compliance and safety personnel. RIZZO • Guiderail Design and Installation Inspection for Access was the single point of contact for the Project and was the and Top of Reservoir – 7000 feet. Owner’s Representative on-site. Additional duties included • Highway Reconstruction Pavement and Guiderail – 6 coordinating and managing the work of the Contractor. Miles. RIZZO’s responsibilities included: scheduling, budget and • Instrumentation Design and Monitoring; cost control, inspection of the Contractor’s work, approval • Drafting Services; of Pay Applications, contract administration, preparation of contract documents and technical specifications, health • Formwork Design, Concrete and Embedded Items and safety programs, Request for Information and approval Inspection of Project Submittals. RIZZO provided on-site supervision • Formal, Intermediate, Emergency, and Special Dam and coordination of all construction activities. These Safety Inspections; activities included schedule, budget and cost control, approval of submittals, responses to RFIs, Cost Estimates, • RCC Mix Design and Placement Means and Methods; preparation of Bid Documents, Contract Administration, • RCC and Conventional Concrete Inspection and On-site Document Control, Construction Monitoring, Cash Flow Testing Projections, review of Value Engineering proposals, Claim Analysis and Negotiation, Dispute Resolution, Performance • Grout Program Design; and Analysis, and Payment Application Approvals. • Overall Construction Oversight and Support. The Taum Sauk project highlights RIZZO’s experience with the following tasks: Total Project Cost: $380 Million RIZZO Contract: $40 Million Point of Contact: Mr. Thomas Hollenkamp • Structural and Dynamic Stability Analysis; Ameren Missouri • Embankment Stability Analysis;

13 SALUDA DAM REMEDIATION PROJECT

RIZZO was retained by South Carolina Electric & Gas of multiple ash-ponds, replacement of 6-ft. diameter (SCE&G) as the Design Engineer and Construction Manager pipes, which delivered cooling water to the on-site coal- for the remediation of Saluda Dam, located in Columbia, fired plant, access , guiderails and new highway South Carolina. The $275 Million Project was completed pavement construction across the dam, and operation in 2005 and, at that time, was the largest active dam and closure of an ash landfill. Replacement of the pipes construction project in the U.S. The Saluda Dam received involved tapping into penstocks, supplying water to the the Outstanding Civil Engineering Achievement (OCEA) as Hydropower Station, and required outage of both plants. the most outstanding project for 2006 as chosen by the American Society of Civil Engineers (ASCE). To minimize economical losses, a tightly choreographed sequence of steps was developed for the pipe The Saluda Dam, which impounds Lake Murray, is owned replacement. The project was multifaceted with an and operated by SCE&G, and is located on the Saluda River, aggressive schedule, with more than 350 people working 10 miles upstream of Columbia, South Carolina. With more on site around the clock. The new dam was built than 500 miles of shoreline, water area covering about immediately downstream of the existing dam. Excavation 78 sq. miles, and storage capacity of more than 2,100,000 at the toe of a high-hazard dam with full reservoir was ac-ft. of water, Lake Murray is one of the largest man-made a very dangerous undertaking. RIZZO designed and lakes in North America. The dam, completed in 1930, is supervised an extensive dewatering program with over 211-ft. high and 7,800-ft. long. It was originally constructed 1,500 working non-stop to lower ground water levels for hydroelectric generation, but today the lake is also the and facilitate excavation. source of cooling water for the coal-fired McMeekin Steam Electric Plant, a source of drinking water for the region and To evaluate effectiveness of the dewatering system and the largest recreation facility in Western South Carolina. monitor dam safety during excavation, hundreds of fully- automated inclinometers and piezometers were installed The Saluda Dam has undergone several renovations since in the dam. These instruments provided a continuous its construction. The most recent renovation is a seismic real-time stream of data and helped engineers to make upgrade to comply with current Federal regulations. timely decisions about safety and progress of construction. RIZZO, with input from a Board of Consultants and FERC, The Instrumentation and Monitoring Program was highly evaluated alternatives for the remediation and decided on praised by industry experts and federal regulators. a large backup dam as the most feasible and cost effective solution. The new 211-ft. tall structure is a combination With space constraints precluding open- excavation, of rockfill and RCC dams. The new dam was designed several retaining walls were required to support the to prevent catastrophic flooding and to ensure the safe 50-ft. deep excavation for the new dam. The project shutdown of the associated hydro and fossil stations. included construction of a 1,500-ft. long and 40-ft. While construction of the 5,500-ft. long rockfill section high tie-back , a 45-ft. high soil bentonite was a major effort, the most challenging and innovative cut-off wall, a 40-ft. high soil-nail wall, and a local jet- aspect of the project dealt with constructing the 2,300-ft. grouted wall. Because of highly irregular and often long RCC section in a narrow corridor, between the existing unpredictable profile, the wall designs had to Dam and existing facilities. be revised in several instances. RIZZO worked closely with the contractor value-engineering the walls to fit In addition to the dam construction itself, the project site conditions. This close cooperation allowed the entailed development of an on-site quarry, excavation construction to progress with no delays, despite difficult

14 5.0 PROJECT DESCRIPTIONS site conditions and shortage of materials due to a tight • Seismic Analysis; steel market. • Dam Break Analysis; Construction of the rockfill portion of the dam entailed • Potential Failure Mode Analysis; placement of 3.5 million cubic yards of soils and rock. The • Comprehensive Geological & Geotechnical RCC section for the dam required 1.3 million cubic yards Investigations; of RCC and mass concrete. All materials were produced on-site. Daily blasting in the quarry, supervised by RIZZO • Design Plans and Specifications for modifications; geologists, produced rock for the construction. Shot rock • Guiderail Design and Installation Inspection for Access was then delivered to the on-site crushing plants, which Roads; supplied various aggregates for the RCC, rockfill, and filters. • Waste Water and Sedimentation Ponds Two Aran RCC mixing plants, with 500 cubic yards/hour • Highway Reconstruction Pavement & Guiderail – 3 Miles; capacity, each provided RCC and mass concrete. Due to the • Instrumentation Design and Monitoring; hot climate, extensive chilling was required. Seven chillers, each with a 230-ton capacity, cooled aggregate and water • Drafting Services; for the RCC mix. At the peak placement in November 2004, • Formwork Design, Concrete & Embedded Items approximately 18,600 cubic yards of RCC was placed in a Inspection; 24-hour period, establishing the new world record. RIZZO provided Construction Management (CM) services for • Formal, Intermediate, Emergency, & Special Dam Safety Inspections; the project that included coordination of all construction activities. • RCC Mix Design & Placement Means & Methods; • RCC & Conventional Concrete Inspection & On-site In addition, a 15 million gallon lined waste water pond Testing; and was designed and constructed. The pond was constructed to capture eroded or disturbed soil that was washed off • Overall Construction Oversight and Support. during construction and rainstorms and to protect the water quality of the adjacent Saluda River. It was also Total Project Cost: $275 Million equiped with an overflow structure and flume to control RIZZO Contract: $44 Million the discharge. The pond is used for the permanent Point of Contact: Mr. James Landreth stormwater management system of the site since the South Carolina Electric & Gas 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;

15 5.0 PROJECT DESCRIPTIONS

16 BLUE RIDGE RESERVOIR PROJECT

The Blue Ridge Dam, and an associated 22 MW The Blue Ridge project highlights RIZZO experience with hydroelectric facility, was constructed in 1931 by the the following tasks: Tennessee Electric Power Company (TEPCO) and was • Structural and Dynamic Stability Analysis; acquired by TVA in 1939. The dam was constructed on the Toccoa River and the facility is operated for hydroelectric • Design Plans and Specifications for modifications; power generation, flood control, and recreational uses. • Instrumentation Design and Monitoring; The dam is approximately 1,050-ft. long at the crest, and • Drafting Services; 170-ft. high at the maximum section, and was constructed • Construction Oversight and Support; and using semi-hydraulic fill construction technology popular in the early 1900s. • Seismic Modification Design.

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.

17 WYRALONG DAM DESIGN & CONSTRUCTION

RIZZO was a member company of the Wyaralong Dam • RCC Mix Design; Alliance, the Team responsible for design and construction • Grout Program Design; and of a new RCC water supply dam located on the Teviot Brook, near the town of Beaudesert in the Logan River • Construction Oversight and Support. Catchment. The dam has been designed to pass flood flows over a centrally placed overflow spillway under Total Project Cost: $120 Million normal conditions, and has been designed to withstand RIZZO Contract: $2.0 Million 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;

18 BEAR CREEK DAM DESIGN & CONSTRUCTION

The Tennessee Valley Authority (TVA) selected RIZZO’s RIZZO’s scope included development of the RCC Berm and approach for the design and construction of a backup RCC Cutoff Wall Design and seismic evaluation; preparation dam, addressing ongoing seepage issues and Probable of bid documents; construction cost estimates; and Maximum Flood (PMF) capacity. TVA constructed the construction observation services during the construction dam in 1969 to provide flood control, recreation, water of the RCC Berm and the Cutoff Wall. supply, and economic development benefits. The structure consists of an earth dam, a concrete overflow spillway, an Point of Contact: Mr. John Duncan intake tower, lined tunnel, and an outlet structure. The Tennessee Valley Authority 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 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.

19 SMITHLAND HYDROELECTRIC

American Municipal Power, Inc. (AMP) is constructing data; assigning parameters to the a new hydroelectric generating plant on the Ohio River subsurface materials; performing slope stability analyses; at the site of the Smithland Dam. RIZZO is designing and developing design drawings and associated technical the excavation and associated dewatering system. The specifications. Slope stability analyses were performed for remaining components of the project were designed by several sections of the excavation for the following loading other engineers and subcontractors. conditions: end of construction, steady seepage, 100-year flood, sudden drawdown, and earthquake. The excavation The project site is located along the left bank of the Ohio design had to meet both FERC and USACE stability criteria, River at mile point 906. The proposed hydroelectric plant and had to be approved by the Owner’s Engineer, Board of will be constructed adjacent to the east side of the weir Consultants, FERC, and the USACE. wall of the dam. The plant will include three (3) turbines with a combined design output of 72 MW. The existing During construction, RIZZO provided embankment safety dam is owned by the USACE, and the project will be monitoring training to on-site personnel, directed the regulated by the FERC. The projected consists of the performance monitoring of the excavation, and interpreted following components: and reported instrumentation data from the network of 10 inclinometers and 30 vibrating wire piezometers. • Marine Cofferdam; 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 • Dewatering System; conditions.

• Excavation; The Smithland project highlights RIZZO’s experience with • Flooding Structure; and the following tasks: • Instrumentation. • Embankment Stability Analysis;

As part of the dewatering system design, RIZZO conducted • Seepage Analysis; pumping tests at the site to better characterize the • Design Plans and Specifications for Modifications; hydrogeologic properties of the subsurface materials at the site. • Drafting Services;

The design of the dewatering system including performing • Geotechnical Instrumentation; and two-dimensional seepage analyses using the Seep2D • Performance Monitoring. program, and three-dimensional seepage analyses using the MODFLOW program. The results of these analyses RIZZO Contract Amount: $600,000 (est.) were used to design the dewatering system for the project Point of Contact: Mr. Mark Hutchins that consisted of the installation of 65 36-inch diameter C.J. Mahan Construction Co. deep wells.

The excavation design consisted of evaluating the subsurface conditions of the site from existing geotechnical

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