ILLINOIS POLLUTION CONTROL BOARD
December
18, 1980
ILLINOIS POWER CONP~NY,
(Hennepin Power Plant),
 )
Petitioner,
v.
 )
 PCB 79—243
ILLINOIS
 ENVIRONMENTAL PROTECTION
AGENCY,
Respondent.
ORDER OF THE BOARD
 (by D,
 Satchell):
On November
 5,
 1980 Illinois
Power
 (IPC)
 filed a motion for
rehearing and on November
 6,
 1980 Illinois Environmental Protection
Agency
 (Agency)
 filed
a motion for clarification, or alternatively
for rehearing,
concerning the
Boardvs October 2,
 1980 Opinion and
Order.
 On November
19, 1980
each party filed a response to the
other’s motion.
 On November
20 the
Board agreed to reconsider and
denied an Agency
motion for relief
from clerical error.
CHLORINE LIMITATION
The Agency objects to the last paragraph on page
 3 of the
Opinion which concerns Rule 910(a) (6)
 of Chapter
 3 and the ques-
tion of whether the Agency
is
authorized to impose its own effluent
limitations in a permit different from the federal limitation,
 where there is
 a federal limitation but no state limitation.
 The
Agency is concerned
that
the language of the Opinion
 may preclude
it from imposing its own
effluent
limitations where the parameter
is subject to neither a federal or a state effluent limitation.
When the entire paragraph is read it is clear that this latter
question was not before the
Board.
 The
October 2,
 1980 Opinion
and Order was not intended as a holding on this point.
CHLORINE MONITORING
In connection
with the chlorine
monitoring requirement, IPC
objects to the option
given the Agency
of either imposing a permit
condition based on total
chlorine
residual with quarterly concen-
tration curves or a
chlorine
monitoring condition based on
 a
 dif-
ferent method of measuring
chlorine.
 IPC’s evidence on
 chlorine
monitoring centered
upon the lack of
necessity for weekly monitor--
ing curves.
 However, in connection with the evidence on what
standard should be applicable, there was some indication that
IPC
preferred monitoring by free available chlorine.
 Had the
 option
40—129
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not been included in the Opinion,
 the result would have necessarily
been a permit with effluent limitations expressed as free available
chlorine and monitoring by total residual chlorine.
In expressing its decision as an option the Board intended to
allow IPC to amend its application to request monitoring by way
of free available chlorine if that were indeed its desire.
 The
information attached to the motion as Exhibit C should be present-
ed to the Agency by way of an
amendment
to the application.
In its response to IPC~smotion the Agency has requested that
the Board remand the condition so that the Agency may rewrite it
to require that free available chlorine be monitored by means of
a
 chlorine concentration curve to be developed quarterly.
 This
appears to be what IPC is requesting in its Exhibit C.
 However,
IPC did not make its request for free available chlorine monitor-
ing in connection with the permit application which resulted in
this appeal.
 The question as to whether free available chlorine
on quarterly concentration curves is required to accomplish the
purposes of the Act is not before the Board.
 There is ample leeway
in the Order as it is written for the Agency to so modify the con-
dition.
 The Board therefore declines to modify its Opinion and
Order with respect to this condition, except to the extent that IPC
 is specifically authorized to
amend
its permit application
 on remand.
REMAND
IPC objects in general to the remand for further action “not
inconsistent with the Board~sOpinion of this date.”
 IPC contends
that the Board should have rewritten the permit conditions in
question
and
ordered the Agency to incorporate those particular
conditions in the permit.
 Section 4(g)
 and Section 39 of the
Environmental
 Protection Act
 (Act)
 confer upon the Agency the duty
and
 authority
 to
 issue
 permIts.
 Procedural Rule 502(a) (10) provides
that
 the
 Order
 of
 the
 Board in a permit
 appeal
 “may
 affirm
 or
 re-
verse
 the
 decision
 of
 the
 Agency
 in
 whole
 or
 in
 part,
 may
 remand
the
 proceeding
 to
 the
 Agency
 for
 the
 taking
 of
 further
 evidence
 or
may
 direct
 the
 issuance of the permit in
 such
 form
 as
 it
 deems
 just,
based upon the law and the evidence.”
Remand
 of
 the
 permit to the Agency for further
 action is con-
sistent with the Act and Board Procedural Rules and is not a sub-
delegation of the Board~sSection 40 appellate powers.
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—3—
1\ny NPDES permit issued pursuant to the Board’s mandate in
this case will be
 a final action of the Agency appealable to the
Board pursuant to Section 40(a),
 If the Agency does not follow
the Board’s Order, or
if IPC has
additional objections to condi-
tions in the permit as issued,
 it may raise these objections in
this manner.
SCREEN BACKWASH
IPC has stated at several points that the
 Board
 must
 either
apply
 Rule
 401(b)
 or Rule 403.
 However,
 Rule
 401(b)
 contains at
least
 five
 references
 to other rules in Part
 IV.
 It
 is
 intended
to
 be
 read
 in
 conjunction
 with the rest
 of
 Part
 IV.
 Indeed,
 if
Part
 IV
 contained
 no
effluent
limitations, then
 Rule
 401(b)
 would
 be
 meaningless.
 In
an enforcement
action
 Rule
 401(b)
 creates
 an
affirmative defense to a complaint alleging
 violation
 of
 the
 ef-
fluent standards--the respondent
can
admit that the contaminant
is present in its discharge, but demonstrate that it is also
present
 in
 its
 intake water,
 Its
function
 in
 the
 context
 of
 a
permit is somewhat
similar,
Section
 40(a)
 of
the Act
places the burden of proof in a permit
appeal upon the permit applicant.
 The burden
 of demonstrating that
a
 contaminant in a discharge
is
 a part of the intake background
is
 upon
 the
 permit
 applicant.
With respect to the screen backwash
 effluent
 limitation
 IPC
has
 several
 arguments concerning the
 application
 of
 Appalachian
Power Company v.
 Train
 545 F,
 2d 1351,
 1377,
 4th
 Circuit
 1976.
~~TTIEflmTtation
 in question
is based on Rule 403 of Chap-
 ter 3, not upon any federal effluent limitation.
 Section 301(b)
(l)(C)
 of the Clean Water Act
 (CWA)
 requires that the permit
 con-
tain
 any more stringent limitations, including those necessary to
meet water quality standards or treatment
 standards
 established
pursuant to state law or regulations.
 Similar provisions are
found in Section 39(b)
 of the Act and Rule 910(a)
 of Chapter
 3.
The State of Illinois is
free
to adopt more stringent water pollu-
tion rules than the federal rules and these must be included in
the NPDES permit.
 If a state?s substantive law requires
 background
contamination to be cleaned up, then a condition must be included
in the NPDES permit, regardless of whether the CWA so requires.
The question before
the Board was
exclusively one of state law:
Do the fish constitute an offensive discharge under Rule 403 and,
if so, are they nevertheless background under Rule 401(b)
 of Chap-
ter 3?
IPC
 quotes
 the following language from
 Section
 12(f)
 of
 the
Act:
 “No permit shall be required under this
 Subsection
 and under
Section 39(b)
 of the Act for any discharge for which a permit
 is
40—131
—4—
not
 required
 under
 the
 Federal
 Water
 Pollution
 Control
 Act
 Amen-
ments
 of
 1972
 (PL92-500)
 and regulations pursuant thereto.’
 IPC
contends that this, in connection with Appalachian Power,
 limits
the Agency’s authority to impose permit conditions which would
require a discharger to remove background contaminants.
 However,
Section 12(f)
 relates to the permit requirement:
 the Board cannot
require NPDES permits of dischargers which would not be required
to have
 NPDES
 permits
 under
 the
 Clean
 Water
 Act.
 IPC
 has
 not
 at
any time in this proceeding contended that the facility, or its
cooling water discharge,
 is not subject to the NPDES permit re-
quirement.
 Once the permit requirement is established, conditions
required pursuant to state law must be included.
CATEGORIES OF FISH
IPC
 has
 indicated
 confusion
 about
 the
 categorization
 of
 fisn.
It
 has
 demonstrated
 that there exist a certain number
 of
 dead
 fish
in
 the
 river
 water
 before
 it
 is
 taken
 into
 the
 intake
 structure.
These
 fish
 constitute
 background
 within
 the
 meaning
 of
 the
 Rule
401(b);
 Rule
 403
 therefore
 does
 not
 require
 that
 they
 be
 removed
from
 the
 discharge
 where
 no
 more
 than
 traces
 are
 added.
 There also
exist
 in
 the
 Illinois
 River
 live
 fish,
 some
 of
 which are impinged
in
 the
 intake
 structure.
 Those
 fish
 which
 die
 prior
 to
 discnarge,
and
 which
 are
 floating,
 violate
 Rule
 403.
 They
 are
 not
 within
 the
background
 exception
 of
 Rule
 401(b),
 even
 though
 they
 were
 present
as
 live
 fish
 in
 the
 river
 prior
 to
 intake.
 Live
 fish
 are
 not
‘background” contaminants within the meaning of Rule 401(b) with
respect to fish killed by IPC’s process.
Illinois Power has expressed concern about fish which are
merely injured in the impingement process but which may recover
subsequently.
 The basis of the permit condition is not the pro-
tection of fish.
 This was the subject of the Section
 316(b)
 study.
The permit condition is based on Rule 403 which proscribes the dis-
charge of dead, floating fish to the river.
Rule 401(b)
 states that,
 “it is not the intent of these regula~-
tions to require users to clean up contamination caused essentially
by upstream sources or to require treatment when only traces of
contaminants are added to the background.”
 Upon reconsideration
the Board will modify its previous Opinion and Order in the follow-
ing manner:
 “The permit should expressly authorize the discharge of
background or the addition of traces to background.”
Rule 401(b)
 also states that the effluent standards “are abso~-
lute standards that must be met without subtracting background
concentrations.”
 If IPC is adding more than traces to the back-
ground of dead fish, then it must remove all of the dead fish from
its discharge.
40—132
—5—
COST
 OF
 COMPLIANCE
Assuming
 that
 IPC
 is
 in
 violation
 of
 Rule
 403,
 it is subject
to
 an
enforcement
 action
 regardless
 of
 whether
 the
 condition
 re-
quired by Rule 403
 is included in the permit.
 If IPC is already
required to spend a certain amount of money to comply with Rule
403
 and the same expense would bring it into compliance with the
permit condition, then it cannot say that the condition imposes
any hardship upon it.
 It is Rule 403 which causes the hardship,
not the permit condition.
Still assuming that Rule 403 requires the permit condition,
IPC may petition the Board for a variance from Rule 403.
 Under
Rule 914 of Chapter
 3 the Board can order modification of the
iTPDES permit as a result of a variance.
 In a variance proceeding
the cost of compliance may be alleged as arbitrary or unreasonable
hardship.
Section
 35
 of
 the
 Act
 authorizes
 the
 Board
 to
 award
 variances
while
 Section
 39
 authorizes
 the
 Agency
 to
 issue
 permits.
 If
 the
Agency were to consider the cost or difficulty of compliance in
deciding whether to incorporate a permit condition required by
 Board regulations, then it would be usurping the authority dele-
gated the Board under Section 35.
 The permit would be
 a type of
variance from the Board regulation.
MISCELLANEOUS CONDITIONS
With respect to the redundant oil and grease reporting re-
quirements, the Agency has responded to IPC’s motion by offering
to
 delete
 the
 redundancy.
 The Board authorizes the Agency to do
so
 on
 remand.
With
 respect
 to
 Standard
 Condition
 No.
 27,
 the
 Board
 intended
to
 endorse
 the
 Agency’s
 suggested modification in
 the
 language,
which appears to adequately protect IPC.
 The permit conditions
relate to exercise of the Agency’s
 authority to impose
effluent limitations pursuant to Rule 910(a) (6)
 of Chapter
 3.
 If
this authority is exercised,
 it will be by way of permit modifica-
tion.
 IPC may challenge that authority by way of appeal of the
modified permit.
 The Board does not perceive any additional pro-
tection afforded by IPC’s surplusage.
The Board’s Opinion and Order of October 2,
 1980 is modified
as noted above.
IT IS SO ORDERED.
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—6—
I,
 Christan
 L.
Moffett,
 Clerk
 of
 the
 Illinois
 Pollution
Control Board, hereby certify that the above Order was adopted
on the
 j~
~
 day of
 j•.,.
 ,
 1980 by a vote of
 ~-‘-~
 ~
Christan L. Moff~tt,Cle
Illinois
 Pollution
 Control
 Board
40—134