iLl. IND

I

S POLI,LJTI ON CONTROL BOARI)

March

29, 1973

)

SkLT CREEK DRAIN WE B\SIN

)

SANITARY DISTRICT

)

)

)

V.

)

PCB 72-134

)

)

ENS’ I R.NM1AT.~L PR(V1’ICTII)N ~~CiiNCY

)

)

OPINI~~NAND OflUER 01

TIlE

B’’ARD (by

Mr.

Durnelle)

This is a petition requesting a variance from Rules 404(c), 921(d)

and 1002

of the

ñ;iter

Regulntions. hearings were held en October 20

and ;iecember 13, 19~2.

The

District eporates its

sewage

treatment plant in Villa Park

in

iluPage County.

The

plant discharges into Salt Creek which

affords a dilution ratio of between I to I and 2 to 1. The plant

has a design average flow of 3.0 MCD and a design maximum flew

of

0.0 MCD. The design

loading is

for

45,000 population equivalents.

the

trickliag filter process of

the plant was designed to produce

an

effluent containing

no

greater

than 30 mg/i BOll and 35

mg/i

suspended solids.

The average flow at the plant has been 4.8

MGi~with an organic loading or 51,000 P.E.

.~ccording to the District, th~

daily average for its

effluent in

1971 and some of 1972 were 14.7 mg/I 1401) and 18 mg/l suspended

solids. \ccording

to

Agency samples

the plant effluent has been

36 mg/I BOD and 47 mg/I suspended solids.

The District pro;ioses to expand and upgrade

its treatment facilities

in two phases.

Phase I consists of providing a

new

raw sewage

junction chamber to allow better control of future flows.

It will

increase thc raw

sewage pumping capacity to 12.5 MCD and will provide

fi’~a1 settling capacity for

a

normal

design flow of S

MCD. Tt will

also :irovide additional chlorination facilities to permit chlorina-

t

ion

of

excess wet weather 1low~. the Agency permit for this Phase

i

t~urkha:; already been issued.

N;asc 11 will convert the plant from the trickling filter process

to an activated sludge process and will also increase the plant

c:tpacity to S MCD. Final plans for this phase were expected to be

completed in February, 1973. They expect to award the construction

contract iii May, 1973. they expect construction to begin by Juno,

1973 and to be compl:tod by December 31, 1974.

7—417

---

Rule 404(c) requires that by December 31, 3973 no effluent whose

dilution ratio is less than S to 1 shall exceed 10 mg/l BOll and

12 mg/i suspended solids. The District is asking for a variance

of one year until

December

31, 1974. The main reason given by

the District for needing the variance is to receive construction

permits from the Agency. Under Rule 921(d), the District must

have an approved Project Completion Schedule before any permit can

be issued. in this case the Schedule cannot be approved by the

Agency because it shows a completion date after the December 31,

1973 deadline under IthIe 404.

The Agency recommendation suggests that we grant a variance from

Rule 921(d) and 1002 but deny any variance from Rule 404(c).

We agree. Since all that is necessary in this case is for the

petitioner to receive its permits prior to approval of its

Project c:orn~)ivr1on Schedule

we

need only grant variances from

Rules 921(d) and 1002. A variancc Irom Rule 404(c) is unnecessary

at this point. ‘Ihis will allow the Agency to issue the permits

and thus will a11ot~the l)istrict to complete the project as quickly

as possible.

This opinion

con~ti

tutes the

Board’s

findings of fact and conclusions

of law.

IT IS SO

oRi’I:’u~,’

I

,

Chris Ian I.. ~.!nfI

t

•

i:

I

i’rk o I the liii flOk

PnI Jut ion Coin rol

Board, hereby

or:

i

fy

I

Jb’

uI’et e

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•

‘rder ‘cei’e :i’~opted

on the

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973

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