Cost estimate data

June 1, 2007

From the GMA Techline Subject: Cost estimate data In 2006, we completed a 30-acre pond (depth, approximately 30 ft.), and now we want to estimate the cost for a pond of similar size for a construction start in November 2007. For estimating purposes, are you able to suggest a percentage increase that we should use …

Geogrid-reinforced soil mat

From the GMA Techline Subject: Geogrid-reinforced soil mat I am considering a geosynthetic-reinforced soil mat to be placed under a building structure with conventional footings. The purpose of the soil mat would be to limit differential settlement across the building footprint in event of seismically induced liquefaction settlement. That is, instead of a pre-stressed concrete …

Geotextile fabric

From the GMA Techline Subject: Geotextile fabric We are specifying geotextile fabric: between the soil media (in a raingarden) and the underlying stone that contains the underdrain pipe. between the sod and the underlying stone (water quality swale) that contains the underdrain pipe. the top, bottom, and sides of an infiltration trench (filled with VaDOT …

Use of geosynthetics in deicing facilities at the Cleveland airport

Using GCLs and a cellular confinement system, the objective was todesign and construct a centralized deicing pad where fluid could beapplied and collected in a fully controlled manner. By Daniel Petno and Chris Athanassopoulos Introduction The design and construction of a new centralized deicing facility at Cleveland-Hopkins International Airport (CLE) involved several geosynthetic applications, including …

AOS vs. EOS

From the GMA Techline Subject: AOS or EOS? What is the difference between AOS (Apparent Opening Size) and EOS (Equivalent Opening Size)? (Larry, Louisiana) Reply: The real answer is: “Not much.” Now let me answer your question. The U.S. Army Corps of Engineers developed AOS in 1972 on the basis of sieving glass beads through …

Experience with GCLs used as a conductive layer in geomembrane leak-location surveys

By Glenn Darilek and Daren Laine Engineers, installers, regulators, and owners are starting to rely on geomembrane leak-location surveys as part of the construction quality assurance for landfills. The various methods are described in ASTM Standard D 6747.1 Standard procedures for conducting leak-location surveys of geomembranes covered with earth materials are described in ASTM Standard …

Synthetically reinforced natural turf installed at Lambeau Field

The playing surface at Lambeau Field—home of the National Football League’s Green Bay Packers—has undergone a facelift this year. The $3 million makeover promises a new football field with the latest technology in natural turf plus the addition of synthetic reinforcement. DD GrassMaster, a natural grass surface reinforced with man-made fibers developed by Desso DLW …

A river runs through it: Displacement of Serbia’s Kolubara

The expansion of a massive Serbian coal mine requires moving a river. By Svetomir Prokic and Ronald K. Frobel Overview The Kolubara open pit mine is the largest and most critical supplier of lignite coal in the Republic of Serbia and a crucial component in that country’s emerging economy. The mine encompasses more than 600km2 …

Geotube technology project in India

A district irrigation department in West Bengal, India has initiated a geotextile tube project on an experimental basis in an effort to check coastline erosion. A 1-km test section on the Bay of Bengal coastline from Shankarpur to Jalda in the district of East Midnapore was installed this spring. The project, implemented to stop the …

Multiple-tiered retaining walls

April 1, 2007

The Norris Canyon Estates in San Ramon, Calif., east of San Francisco, are gaining a local presence not merely for luxury homes but also for the nearly half-million ft.2 of multiple-tiered retaining walls built throughout its challenging terrain. A location with 1:1 slope ratios and expansive clay soils required a major transformation to make the …