May 23, 1972METROPOLITAN SANITARY DISTRICTOF GREATER CHICAGOv.
) #72—110
ENVIRONMENTAL PROTECTION AGENCYOpinion of the Board (by Mr.
In any case, to improve this performance
(to an estimated 8 and 12 mg/i respectively, exclusive of algae)and to provide additional capacity for expanded influent sources,MSD plans to add ferric chloride and polyelectrolytes to improve settling and to construct an aerated lagoon.
MSD says the permits contemplated construction
of the presently planned facilities only in conjunction withtertiary filters that both parties now agree need not be builtbecause of the changed standards.
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Allowed
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