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L.A. may require stormwater capture
April 1st, 2010
A proposed city ordinance would require residential and commercial developments in Los Angeles to capture and reuse runoff generated in rainstorms. The proposal was originally approved in January by the city’s Department of Public Works. It would require such projects to capture and reuse 100% of runoff generated by a 0.75-in. rainstorm or to pay […]
Delaware students win 2010 GeoChallenge
April 1st, 2010
Compiled and edited by Ron Bygness The team of civil engineering students from the University of Delaware emerged from a strong field to win the 5th annual GeoChallenge Student Competition Feb. 23, 2010. The event was conducted during the American Society of Civil Engineers’ annual GeoCongress—this year at GeoFlorida in West Palm Beach. Student teams […]
Residents want geotextile tubes for beach protection
April 1st, 2010
Compiled and edited by Ron Bygness Australian residents near the New South Wales mid-north coast area of Taree have very personal and vested interests in the Old Bar erosion issue. Many say they intend to retire there on the beachfront location midway between Sydney and Brisbane. That is, if the resort area can withstand the […]
Backfill depleted open-pit mines with lined landfills, tailings, and heap leach pads
April 1st, 2010
By Allan J. Breitenbach Abstract Landfills, tailings impoundments, and heap leach pads are the largest and highest geomembrane-lined fill structures in the world. These lined structures require large areas for storage and containment of solid wastes, precious or base metal mill waste tailings, and ore heap fill materials. Today, municipal waste landfills are considering the […]
Questions about GM/GCL composite liners
April 1st, 2010
From the GMA Techline Subject: 3 questions How do I approach designing/specifying GM/GCL composite liners for MSW landfills? Do I simply adopt the GM13 standard, which is based on fundamental research, and then double-check that the leachate leakage rate is within acceptable limits for my specific project? What other material parameters need to be project […]
Testing HDPE geomembrane liners
April 1st, 2010
From the GMA Techline Subject: Testing We prepared specifications for [a landfill] liner section that included parameters for nondestructive testing of the primary (80-mil) and secondary (60-mil) HDPE geomembrane liner. At this time, there is a need to install a 30-mil liner along the sideslope. It is my understanding that GRI does not provide any […]
Veneer stability
April 1st, 2010
From the GMA Techline Subject: Veneer stability I have a question about veneer stability in moving earth upslope vs. downslope. In the downslope equations in GRI18, how is the lack of a buttressed passive wedge accounted for in the factor of safety (FS) equations during placement of soil? I think I am getting confused on […]
Difficult lining task
April 1st, 2010
From the GMA Techline Subject: Lining task Please find attached some recent pictures of an aluminum storage tank in one of our ongoing projects. Initially, we proposed to line the tank with a 2mm-thick HDPE sheet based on its chemical resistance. The tank is already fabricated with carbon steel by our client who failed to […]
Textured HDPE?
April 1st, 2010
From the GMA Techline Subject: Textured HDPE? We are looking at a stormwater basin about 2-3 acres in size with a 20-30ft side slope at 4:1. We are using 60-ml HDPE smooth and it will be covered with sand. The pond will be partially filled with water most of the time. Will the sand stay […]
Geocell application
April 1st, 2010
From the GMA Techline Subject: Geocell application I would like to know the suitability of geocell as slope surface protection on acidic soil conditions. Can we apply geocell directly on top of the slope surface? (Azilah, Malaysia) Reply: Geocells are regularly used in exactly the type of application you describe. A geotextile is generally placed […]