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The GMA Techline
April 1st, 2019
Vegetation causing gases under geomembrane? Q: I have a site where we are installing a high-density polyethylene (HDPE) liner in an existing pond. Because of some residual heavy metals in the top layer of soil, I would like to strip off the top 3–6 inches (7.6–15.2 cm) of soil and vegetation. Alternatively, we could mow and […]
NHI hosting course on earth retaining structures in New Mexico and California
April 30th, 2018
The Federal Highway Administration (FHWA) National Highway Institute (NHI) will host a three-day instructor-led course on earth retaining structures twice this summer, in Sacramento, California, and Santa Fe, New Mexico. The course (Course Number FHWA-NHI-132036) will provide state-of-the-practice design tools and construction techniques to expand implementation of safe and cost-effective earth retention technologies, NHI said. […]