Path: utzoo!mnetor!motto!ecijmm!eci386!clewis
From: clewis@eci386.UUCP
Newsgroups: can.general
Subject: Re: Attikamek-Montagnais Protest PCB Plan
Message-ID: <1989Sep11.142805.862@eci386.uucp>
Date: 11 Sep 89 14:28:05 GMT
References: <2324@yunccn.UUCP> <620791816.24086@telly.on.ca> <1989Sep5.173937.24977@utzoo.uucp> <8328@looking.on.ca> <28908@watmath.waterloo.edu> <2484@dciem.dciem.dnd.ca>
Reply-To: clewis@eci386.UUCP (Chris Lewis)
Organization: R. H. Lathwell Associates: Elegant Communications, Inc.
Lines: 31

In article <2484@dciem.dciem.dnd.ca> bpd@dretor.dciem.dnd.ca (Brian P. Dickson) writes:

>I am afraid you are quite wrong. There is another chemical which has
>rightly gained a bad reputation: dioxin. Dioxin will cause cancer on
>contact, and is considered hazardous in any detectible concentration.
>There is no acceptable level for dioxin - it is dangerous even at
>one part per quadrillion (!). 

Interesting:
	1) The detectability level for 2,3,... (whatever) TCDD (which
	   is supposed to be the most toxic form of Dioxin) is around 20 
	   parts/quadrillion.
	2) The 1988 Fish Eating Guide (published by the MOE) considers
	   1 part per trillion as the main threshold:
		- women of childbearing years, and children under 15
		  should only eat fish with *less* than this level (as
		  often as they want - this is also the commercial limit).
		- other people can eat fish (depending on frequency) of
		  up to *three* times this.
	3) Lake Ontario itself has this level (info published a couple of
	   years ago)
	4) The Guide also mentions that ... TCDD is the most toxic, many
	   (if not most) of the other Dioxins aren't nearly as toxic.

[Um, I left the book up at the cottage, I'll bring it back down this week,
so I can double check the other numbers I remember and post them.]
-- 
Chris Lewis, R.H. Lathwell & Associates: Elegant Communications Inc.
UUCP: {uunet!mnetor, utcsri!utzoo}!lsuc!eci386!clewis
Phone: (416)-595-5425