ILLINOIS POLLUTION CCNTROL BOARD

#R70—3:

Secondary

Treatment

Dates,

Mississippi River

(As Adopted January

6, 1971)

I.

5145—12 and 13 are hereby amended as follows:

1.

Repeal the regulations found in paragraphs

7

of

Rule 1.07 of SWB—l2 and of Rule 3.01 of 5145—13 and in its

place substitute the following:

“‘All oxygen-demanding waste discharges and wastes

containing .suspended solids shall receive a minimum of

secondary treatment,

as defined herein, by December 31,

1973.

“For sewage works which receive influent equal to or

greater than 10,000 populatLon equivalents (P.E.), secondary

treatment shall mean that degree of treatment which will

result

in

at least a 90

reduction in five—day biochemical

oxygen

demand (SOD5)

and

suspended

solids

and

provide

an

effluent

which

contains

no

more

than

20

.‘ng/l

of

five—day

biochemical

oxygen

demand

(SOD5)

and

25

mg/l

of

suspended

solids.

“For

sewage

works

which

receive

an

influent

of

less

than

10,000

population

equivalents

(P.E.),

secondary

treatment shall mean that degree of treatment which will

result

in

at

least

an 85

reduction in five—day biochemical

oxygen

demand and

suspended

solids

and provide an effluent

which contains no more than 30 mg/l of five—day biochemical

oxygen demand

(BOD5) and 37 mg/l of suspended solids.

“Disinfection will be provided for all effluents to

reduce fecal coliforms to 400 per 100 ml or less before

discharge to any waters designated for primary contact

or to 2,000 per 100 ml before discharge to any other waters.

“Bypass flows in excess of sewage works capacity shall

be given primary treatment and disinfection in auxiliary

facilities.

“Any dates appearing

in

this

regulation

which

are

inconsistent with the December 31, 1973 date are hereby

repealed.”

2.

Repeal the regulations found in paragraphs 11 (a)

and 11

(b) of Rule 1.07 of 3143—12 and Rule 3.01 of SWB—l3.

II.

Rules and Regulations SWB—1+ are hereby repea2ed.

I

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