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effluent limits



A friend of mine would like to find out the effluent limits, concentration
levels etc. for various substances in the metal surface finishing
industry.  The substances concentration limits (mg/l or ppm) he's
looking for are:

Cadmium
Chromium
Mercury
Copper
Lead
Nickel
Silver
Tin
Zinc
Cyanide
Org. Halogens

If anyone knows the effluent limits or where to find them (a website, etc.),
I could pass the information on to my friend.  Thanks.

Jingyang Zhang
Department of Environmental Health Sciences
University of California
Los Angeles, CA 90095
(310) 8257-599