Yeager Airport: Deconstruction and reconstruction of the side of a mountain

April 1, 2019  |  Features

Yeager Airport is located on top of a series of leveled mountains in Charleston, W.Va. Completion of the original airport construction in the 1940s required 9 million cubic yards (6.9 million m3) of soil and rock earthwork (Keller 2017). In 2005, due to Federal Aviation Administration (FAA) safety r…
A leachate pond geomembrane after 25 years of service

February 1, 2019  |  Features

This article reports on the evaluation of an exposed geomembrane liner in a landfill leachate pond after being in service for 25 years. The evaluation was performed in two campaigns: in August 2014 and in May 2018. The purpose of the evaluation was to determine the condition of the geomembrane and t…
Reviving the Palos Verdes Reservoir, Part 3

February 1, 2019  |  Features

California’s water infrastructure is one of the most challenged systems in the United States due to the large population it supports, the age of much of the water infrastructure, and the diverse environments—mountains, coastlines, old-growth forests, deserts—found in the state. The water infra…
Geocomposite groundwater drainage system for bluff erosion protection

February 1, 2019  |  Features

The project presented herein was designed to enhance an existing groundwater drainage system and repair erosion related to groundwater seepage on a berm constructed using coal combustion residuals (CCR) on top of a Lake Michigan bluff at a site in southeastern Wisconsin. This article presents the pl…
Managing urban water issues with geosynthetics

November 19, 2018  |  Features

Following the devastation of Hurricane Katrina, the Army Corps of Engineers awarded Phylway Construction a contract to rebuild the Lake Pontchartrain levees in Louisiana. After extensive testing, high-performance turf reinforcement mat (HPTRM) products were approved, with Phylway using East Coast Er…
Multilinear drainage geocomposites to filter oil sands tailing slurries

October 1, 2018  |  Features

Mining and some energy operations generate large quantities of water-containing tailings. These tailings are made of crushed-rock particles that are deposited in a slurry form. This is the case for coal, tar sand, lead, zinc, gold, silver, copper, molybdenum, nickel, taconite (iron), phosphate, baux…
Automation of large-scale geotextile and geomembrane fabrication

October 1, 2018  |  Features

The development of a large-scale fabrication machine was conceived during the fabrication of geotextiles for a tailings pond cap in 2010. The machine joins five strips of material at a time to create fabricated panels for large projects. It is capable of both welding geomembranes and sewing high-str…
Geosynthetics opportunities and solutions in shale gas extraction

October 1, 2018  |  Features

While natural gas contained within shale rock is geologic and thus ancient by its very nature, the practice of its removal by horizontal drilling coupled with hydrofracking is a relatively recent development (Figure 1). Indeed, these dual technologies are making possible the recovery of huge amounts…
Geocomp introduces bi-directional shear testing machine

August 24, 2018  |  Features

Geocomp announced in August it has released an addition to the company’s series of fully-automated laboratory soil testing systems: a Bi-Directional Cyclic Direct Simple Shear (BDCDSS) machine. This table-top unit allows simple shear testing to be performed in two orthogonal horizontal directions …
Geocomposite lamination strength ASTM test method: Time for an update

August 1, 2018  |  Features

Recent project experience that included continuous peel testing across the roll width of geocomposite materials has shed light on the issue of peel strength between geotextiles and geonets that are heat-bonded together. The variability of peel strength across a roll width is found to be much greater…