ORSANCO Delays Mixing Zone Prohibition

ORSANCO (the Ohio River Valley Water Sanitation Commission)  has elected to delay its prohibition on mixing zones for bioaccumulative substances until October 16, 2015.  The prohibition had been scheduled to go into effect on October 16, 2013 for the following substances:

Bioaccumulative Chemicals of Concern

Lindane	Mirex
Hexachlorocyclohexane	Hexachlorobenzene
alpha-Hexachlorocyclohexane	Chlordane
beta-Hexachlorocyclohexane	DDD
delta-Hexachlorocyclohexane	DDT
Hexachlorobutadiene	DDE
Photomirex	Octachlorostyrene
1,2,4,5-Tetrachlorobenzene	PCBs
Toxaphene	2,3,7,8-TCDD
Pentachlorobenzene	Mercury
1,2,3,4-Tetrachlorobenzene	Dieldrin

During the extension of the mixing zone prohibition, dischargers will be expected to be working on reductions in bioaccumulative substances.

Ken Ward's article on the Commission's action is here.