TWO POINTS: BOTH DIOXINS & DDT DISSOLVE IN CHLOROBENZENE AND MIGRATE WITH IT BOTH WITH THE SLOWLY DISSOLVING CHLOROBENZENE PLUME AS WELL AS WITH THE BULK OF THE REMAINING DNAPL

 

So chlorobenzene is hardly the pesky, younger brother hanging around with the older, faster moving more toxic sibling (NDMA). This is partly how chlorobenzene has been falsely portrayed by Elmira polluters and their fellow travellors.  Other important points include the often repeated phrase "slowly" dissolving chlorobenzene or DNAPL.  Contrary to the inferences by Allan Deal (GHD) chlorobenzene basically does equal DNAPL even though the dissolved in groundwater chlorobenzene plume is no longer DNAPL. However every single droplet of the chlorobenzene contaminant plume came from the original chlorobenzene DNAPL discharged into the natural environment by incompetent, negligent or uncaring corporations. Furthermore the bulk of discharged DNAPL remains as DNAPL in the subsurface while only a tiny part of it over decades to centuries actually slowly dissolves into the groundwater.  This dissolution can also be slowed even more by the extent of other contaminants already dissolved in the groundwater.  Hence the term Effective Solubility refers to the actual solubility of a compound such as chlorobenzene in a mixture of groundwater plus all the other contaminants discharged by Uniroyal Chemical. This Effective Solubility is usually very much smaller than the Lab Solubility of the compound in pure water.

DDT and Dioxins are not insoluble in water. Yes they have a very low solubility but particularly in the case of Dioxins their Ontario Drinking Water Standard is more than a thousand times lower than their solubility in water. 

The issue is both the remaining subsurface DNAPLs both on and off the former Uniroyal site including chlorobenzene and others which are and will continue to slow the remediation of the aquifers as well as the accompanying Dioxin, DDT and other contaminants all mixed in.