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Factory fabrication reduces field welding, reduces installation time and costs, allows modular construction and provides consistent seam and liner quality.

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FGI expands Summer Internship Program
Timothy D. Stark, University of Illinois at Urbana-Champaign, Jennifer Miller, University of Illinois at Urbana-Champaign, Billy Hernawan, University of Illinois at Urbana-Champaign, Raymond Pu, University of Illinois at Urbana-Champaign, & Abdou Diouff, University of Illinois at Urbana-Champaign
Geosyntheticsmagazine.com November, 2017
The Fabricated Geomembrane Institute (FGI) at the University of Illinois at Urbana-Champaign (UIUC) expanded its student internship program to three companies and six interns during the summer of 2017. The first year of the internship program in 2016, one intern worked for Colorado Lining International (CLI) at various sites in the United States. The main objectives of the program are to introduce future civil engineers to the field of geosynthetics field, civil engineering construction, and provide a connection between possible future employers and the many undergraduate (~2,400) and graduate students (~1,200) at the UIUC.
Long-Term Durability of Geomembrane Materials and Seams
Timothy D. Stark, Rodgrigo Fernandez, Zach Wenz, Steve Koski
Protecting Geomembranes from Animal Damage
Timothy Stark, University of Illnois, Andrew Mills, Layfield
Geosynthetics Magazine, June/July 2017
Resisting animal and insect attacks of geomembranes is an interesting problem. Geomembrane installers and manufacturers have had numerous geomembranes damaged by bears, deer, coyotes, birds, beavers and ground squirrels. In most cases, the damage is incidental to something else the animal is seeking. Deer damage the liner with their hooves trying to climb out. Bears dig through the liner to try and find something on the other side (organic matter left under a liner in a retrofit). Coyotes burrow under the liner on the slope to create a den that doesn’t freeze.
Morro Reservoir Rehabilitation Project
Timothy D. Stark, Ph.D., P.E., D.GE, F.ASCE; Douglas Hilts, S.E. & Jennifer Miller, M.S.
Land and Water, January/February 2017
The Fabricated Geomembrane Institute (FGI) at the University of Illinois at Urbana-Champaign, presented its inaugural Fabricated Geomembrane Engineering Innovation Award to Hilts Consulting Group of Yorba Linda, California, on 11 May, 2016 during its annual membership meeting in Miami Beach, Florida during Geo-Americas 2016. The Fabricated Geomembrane Engineering Innovation Award provides recognition for engineers who have creatively used fabricated geomembranes to successfully fulfill a client’s need including technical requirements, scheduling, and budget. Hilts Consulting Group was selected as the recipient for the award based on their Morro Reservoir Project in Fallbrook, California.
FGI Initiates Summer Internship Program
Jennifer Millers, M.S., and Timothy D. Stark, PhD.
geosyntheticsmagazine.com
The Fabricated Geomembrane Institute (FGI), based at the University of Illinois at Urbana-Champaign (UIUC) has concluded its first student internship program. The main objectives of the program are to introduce future civil engineers to the field on geosynthetics and to provide a connection between possible employers and the many undergraduate and graduate students at the UIUC.
Tight Timeline + Extreme Specs = A Notable RPE Geomembrane Install
Bruce Wright
Geosynthetics October/November 2015
Northeastern British Columbia could, by most definitions, be considered the middle of nowhere. Tumbler Ridge (pop. 2,710), a district municipality in the foothills of the Canadian Rockies bordering Alberta, is and was from its inception in 1981 all about coal. And like many a town with a single major industry, it waxes and wanes on the strength of that industry.
Avoiding Surprises in Slope Stability
Timothy D. Stark, Ph.D., P.E., D.GE, F.ASCE, Brian H. Queen, and Hangseok Choi, Ph.D., P.E.
Geo-Strata / www.asce.org/geo
The ability to analyze and compute factors of safety for slopes has increased greatly in the last decade. This ability has increased to the point that factors of safety can be computed using even complex limit equilibrium methods, such as Morgenstern and Price (1960), which used to be too computationally intensive for microcomputers; the finite-difference method, such as FLAC/Slope; and the finite-element method, such as PLAXIS.
Geosynthetics in New Transportation Applications
Timothy D. Stark and Davik Paiko
Geosynthetics April/May 2014
Geosynthetics are useful and versatile materials that have found a range of applications in transportation projects (Berg and Suits, 2000). Geosynthetic materials can decrease project costs and project time; increase design life, stability, and range of acceptable borrrow material; and improve performance - important given the large backlog of infrasturcture projects and limited funding.
Sustainable geomembrane recycling and downcycling
Timothy D. Stark, Jennifer Miller, David LaFiura, and Scott Fought
Geosynthetics June July 2013
Pennsylvania’s Department of Environmental Protection (DEP) and Department of Community and Economic Development (DCED) officials have welcomed the recent emersion of companies that collect and reprocess geomembranes used in various aspects of Marcellus Shale oil and gas drilling, development, and production. The geomembrane uses include well pad liners, above ground impoundments, secondary containment, and floating covers. Well pad liners are placed over a large area (usually 200ft × 200ft) around the drill well to contain drilling fluids, provide an antislip surface for drill workers, and contain oil and gas products.
Rehabilitation of Raw Water Reservoir for Franklin WTP
Bill Shehane, P.E.
Land and Water
During the summer of 2007, the city of Franklin, Tennessee and its surroundings were experiencing a severe drought. Due to the high heat and low flows in the Harpeth River, Franklin struggled to meet water supply demands in the area. The city’s raw water reservoir, which can hold 85 million gallons, was completely dry for several months. As a result, the 2.0 MGD Franklin water treatment plant was inoperable for periods of time. Water is normally pumped from the Harpeth River into the raw water reservoir, where it is later treated before consumption.
Air-channel testing of thermally bonded flexible polypropylene geomembrane seams
Timothy 0. Stark, Richard W. Thomas, and Thomas J. Dehlin
Geosynthetics April/May 2013
For more than a decade, thermal welding has proven to be an efficient and costeffective procedure for field-seaming geomembranes. Thermal welding of polyvinyl chloride (PVC) geomembranes has allowed use of air-channel tests in lieu of destructive peel tests to verify field seams meet specified seam peel strength (Thomas and Stark, 2003).
Benefits and Cost Advantages of Fabricated Geomembranes
Timothy D. Stark, Gary Kolbasuk, Stanford Slifer, Duff Simbeck, and Jeremiah Boorsma
Land and Water July/August 2011
Some geomembranes are flexible enough that they can be factory seamed into large panels, folded, transported, unfolded without creasing or damage, and field seamed and tested as necessary. These geomembranes are relatively thin, flexible, and are mainly produced by calendaring, lamination, and extrusion manufacturing processes. In short, calendaring uses a series of hard pressure rollers to form a thin sheet of plastic material, e.g., a geomembrane. Lamination involves constructing a geomembrane by uniting two or more layers of material, e.g., two plastic sheets with a fabric or scrim in the middle. Extrusion manufacturing is a process used to create a thin plastic sheet by forcing heated plastic through a die of the desired thickness.
How Geomembranes Have Been Instrumental in Cleaning Up BP's Oily Mess
By: Bill Shehane – Seaman Corporation
Underground Stormwater Detention Systems
Terence Sheridan and Timothy D. Stark
Land and Water May/June 2010
Roosevelt Manor sits in the heart of Camden, New Jersey’s Centerville neighborhood across the Delaware River from Philadelphia. Built in the early 1950’s via authorization of President Harry Truman and under the direction of the Camden Housing Authority, Roosevelt Manor broke new ground as an integrated public housing development. Unfortunately, Camden, like many other urban cities, struggled over the last half of the century. Just over 50 years after opening its doors the four acre development was demolished and with HopeVI funding from the U.S. Department of Housing and Urban Development, Roosevelt Manor was rebuilt.
Reduction of destructive tests for PVC seams
Richard W. Thomas and Timothy D. Stark
GFR, March 2003
One of the current research topics being pursued by the PYC Geomembrane Institute (PGI) is the thermal welding and subsequent air channel testing of PYC geomembrane seams, which is the focus of this article. Other active research projects include the long-term performance ofPYC geomembranes using field case histories, shear behavior of PYC geomembrane interfaces, puncture characteristics of PYC geomembranes, and the chemical resistance ofPYC geomembranes. These projects will be discussed in future articles.
Temperature Curtain Improves Salmon Habitat
By Bob Gee, Bureau of Reclamation, Greg Morris, Bureau of Reclamation & Stanford Slifer, Watersaver CO.
A temperature curtain reaching depths of 100 feet recently replaced curtains originally installed in both the upper and lower reaches of Whiskeytown Reservoir in the early 1990’s. Located at the Whiskeytown Reservoir approximately 10 miles west of the city of Redding, in Shasta County Cali- fornia, the purpose of the replacement curtain is to lower the temperature of the Sacramento River for fish spawning which would restore the Chinook salmon runs to this part of the Sacramento River.
Underground Stormwater Detention Systems
Timothy D. Stark, Ph.D., P.E., is a Professor of Civil and Environmental Engineering at the University of Illinois at Urbana-Champaign and Technical Director of the Fabricated Geomembrane Institute
Roosevelt Manor sits in the heart of Camden, New Jersey’s Centerville neighborhood across the Delaware River from Philadelphia. Built in the early 1950’s via authorization of President Harry Truman and under the direction of the Camden Housing Authority, Roosevelt Manor broke new ground as an integrated public housing development.
Fabricated Geomembranes: Advantages and Uses
Timothy D. Stark, Luis F. Pazmino, Stanford Slifer, and Duff Simbeck
In general, geomembranes come in two distinct types. The first type is flexible enough for folding, transport to a job-site in large panels, unfolding, and seaming to other panels for field testing. The other type cannot be safely folded and instead ships as rolled goods.