ETTL News & Views
Volume 12 • Spring 2004 Newsletter
The new electronic version of ETTL's Newsletter … Keeping you up to date on
what's happening at ETTL Engineers & Consultants … typical current projects …
how we can be of service to you … links to our web site and people … and more!

Assuring Quality of Liners for a New
Cell at Waco's Municipal Landfill

Typical of the CQA and CQC services ETTL has been providing to numerous new or expanding landfills in Texas and adjoining states, ETTL recently completed CQA (construction quality assurance) services for the liners of a new cell occupying some 12½ acres at the Municipal Landfill of Waco, Texas. Its impressive size is clearly indicated in the photos below, snapped on some very chilly but snowless days this recently ended winter

The photo at left above shows the cell's bottom clay liner in the final stages of being compacted to its specified 1 ft thickness. ETTL checked the liner for density, and also transported samples of each 6" lift to our soil laboratories in Tyler for permeability testing. Such tests usually take one to two days for results. The center photo shows the new cell's high-density polyethylene (HDPE) liner nearly completed. Its panels, 23 ft wide and 500 ft long, have been installed, welded together, and are shining in the wintry sun.

In the photo at right above, an ETTL technician checks the thickness of a panel. Each side of each panel was checked for thickness. We also measured length and width of each panel, monitored seam length and type of seam, logged welder name(s), and ran a destructive seam test every 500 feet of seam, cutting samples and testing them for peel and shear strength. The samples were archived and replaced by welded patches, which also were logged. All this information went into a drawing which became part of the Geomembrane Liner Evaluation Report (GLER) that ETTL prepared for the City of Waco. A similar report was prepared for the soil liner (SLER).

The final picture, at immediate right, shows the 2 ft of protective clay cover being installed over the HDPE liner. ETTL ran sieve analyses during this final operation.

(In-depth information is provided on our web site about the CQA and CQC services ETTL routinely provides for new and expanding landfills.)

News & Views
is published by: