California dam expansion using geosynthetic-strip reinforced MSE wall

August 1, 2013

By Fransiscus S. Hardianto, Robert Lozano, John E. Sankey, and David K. Hughes Introduction The Los Vaqueros Dam was originally built in 1997, creating the Los Vaqueros Reservoir, to improve the quality and reliability of water available to the Contra Costa Water District (CCWD) in Northern California. In 2011, the CCWD expanded the reservoir from …

South Bend recycles a new channel to protect the St. Joseph River

We don’t always have to use all virgin materials for new projects. By Kurt Kelsey Introduction Stormwater management is a necessary task that confronts every municipality. But how the stormwater is actually managed can differ. Typical gray-pipe solutions get the job done, but they do not provide filtering of the stormwater and they are not …

Sustainable geomembrane recycling and downcycling

June 1, 2013

Shale oil and gas open sustainability opportunities. By Timothy D. Stark, Jennifer Miller, David LaFiura, and Scott Fought Introduction 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 …

Performance, design, and redundancy

Geosynthetic reinforced walls in the public sector By Dov Leshchinsky and Fumio Tatsuoka Introduction Geosynthetic reinforced soil can be viewed as a subset area of slope stability. In slope stability analysis, the factor of safety signifies the margin of safety against failure. It physically means that its reciprocal value signifies the average mobilization or utilization …

Dominican Republic farm road improved with new retaining walls

Geogrid reinforcement improves access. By Ángel Conde Introduction The 25-km dirt road from Jarabacoa to Constanza in the mountainous central region of the Dominican Republic has long been a lifeline for local farmers transporting their bananas, vegetables, strawberries, coffee, and flowers. But the road suffered from landslides, severe erosion, and uneven surfaces, which slowed the …

Geogrid lateral load?

From the GMA Techline RE: Geogrid lateral load? I have proposed a GRS wall to replace a cut fill failure. Our geotechnical division says it will not hold the lateral load of the surcharge of a car or truck. It will be 6 feet deep, 8 feet wide, and 90 feet long. We will excavate …

How tubular drainage geocomposite was used in landfill final cover

A first for landfills in the southeastern United States. By Thomas B. Maier, P.E., and Stéphane Fourmont Introduction In landfill final cover systems, geocomposite drainage products are frequently used as a drainage layer above the geomembrane layer and for surficial landfill gas collection, either in strips or as a continuous layer, below the geomembrane. For …

Evaluations of engineered cover systems for mine waste rock and tailings

Geosynthetics for mining waste rock and tailings. By Mark E. Smith and Christos Athanassopoulos Introduction Waste rock dumps and tailings impoundments are common features at mine sites. Many of these waste disposal facilities contain sulfide-rich minerals that generate acid mine drainage (AMD) when they oxidize in the presence of oxygen and water. Control of AMD …

Use of geosynthetics in wind farm access roads

April 1, 2013

Case histories from Poland, Canada, and U.S. By Stephan M. Gale, P.E., D.GE., Mark Kurtz, Fred Chuck, P.E., and Dick Janse Introduction The location of a renewable energy project is based on many technical and political issues. Sites are selected because of available wind forces, power distribution, and land leasing issues, but not normally on …

Measuring a giant one step at a time

Leak location survey at the Columbus Upground Reservoir (CUGR) By Abigail Beck Introduction Once construction is complete later this year, the Columbus Upground Reservoir (CUGR) will be the largest continuously-lined lagoon on the planet, nearly twice as large as the lagoon currently holding that title. The sheer enormity of the project has been compounded with …