Roger,
It will be light years better, but it is not perfect. Here are some bits of trivia I have collected from the web over the months.
Natural clay is often fractured and cracked. Diffusion will move organic chemicals like benzene through a three-foot thick clay landfill liner in approximately five years. Some chemicals can degrade clay.
The very best landfill liners today are made of high density polyethylene (HDPE). A number of household chemicals will degrade HDPE, permeating it, making it lose its strength, softening it, or making it become brittle and crack. Not only will household chemicals, such as moth balls, degrade HDPE, but much more benign things can cause it to develop stress cracks, such as, margarine, vinegar, ethyl alcohol, shoe polish, peppermint oil, to name a few.
A Composite liner is a single liner made of two parts, a plastic liner and compacted soil (usually clay soil). Reports show that all plastic liners (also called Flexible Membrane Liners, or FMLs) will have some leaks. It is important to realize that all materials used as liners are at least slightly permeable to liquids or gases and a certain amount of permeation through liners should be expected. Additional leakage results from defects such as cracks, holes, and faulty seams. Studies show that a 10-acre landfill will have a leak rate somewhere between 0.2 and 10 gallons per day.
regards,
Bev Christian
Research in Motion
-----Original Message-----
From: Roger Stoops [mailto:[log in to unmask]]
Sent: May 5, 2004 9:28 AM
To: [log in to unmask]
Subject: Re: [LF] AW: [LF] amount of lead comsumed
Example of a "modern" landfill design:
http://www.wm.com/WM/environmental/documents/Leachate_Collection_System.pdf
This design will protect groundwater and underground reservoirs, and provide for proper treatment/disposal of leachate by a quality waste management company.
Roger M. Stoops, CID+
Trimble Navigation Ltd., Dayton, OH, USA
Ph: +01 937.245.5288
Fax: +01 937.233.7511
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of Werner Engelmaier
Sent: Wednesday, May 05, 2004 9:14 AM
To: [log in to unmask]
Subject: Re: [LF] AW: [LF] amount of lead comsumed
Hi 'khz,'
> http://www.xfaweb.baden-wuerttemberg.de/alfaweb/print/herten.pdf
> The Herten-landfill was filled totally indiscriminately. Further, being a
totally unaltered gravelpit mere steps from the Rhein and lying in part below the
Rhein water level is certainly about the worst landfill condition imaginable.
And, indeed, the Pb level was founnd to be elevated 'downstream.' This,
however, has nothing to do with solder in electronics--so I fail to see it as a
source of motivation for the LF-solder fiasco.
Regards,
Werner Engelmaier
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