ILLINOIS POLLUTION CONTROL BOARD
September
 8,
 1983
ILLINOIS
 POWER COMPANY,
Petitioner,
v.
 )
 PCB 79—7
ILLINOIS ENVIRONMENTAL
PROTECTION AGENCY,
Respondent.
MR. SHELDON
 A.
 ZABEL AND MS. CARLOYN
 ~.
 L~N OF SCHIFF, HARDIN
& WAITE APPEARED ON BEHALF
 OF THE ILLINOIS POWER COMPANY.
MR. JOSEPH
 R.
 PODLEWSKI,
 JR., ATTORNEY, APPEARED ON BEHALF OF THE
ENVIRONMENTAL PROTECTION AGENCY.
ORDER OF THE BOARD
 (by 3D.
 Durnel le):
On March
 31,
 1983 the Illinois Power Company
 (IPC)
 filed
a Petition to Amend Order requesting the Board amend
 its
February
 15,
 1979 Order herein.
 That Opinion and Order,
 entered
pursuant to Rule 204(e)(3)
 of Chapter
 2:
 Air Pollution,
 imposed
specific emission limitations for sulfur dioxide
 on IPC’s Baldwin
power station.
 On April
 21,
 1983 the Board entered a second
Opinion and Order
 in this matter granting the requested relief.
On May
 3,
 1983, the Illinois Environmental Protection Agency
(Agency) submitted the April
 21,
 1983 Order to the United States
Environmental Protection Agency (USEPA)
 as
 a supplement
 to the
revision to the Illinois State Implementation Plan
 (SIP)
pending before USEPA since the submission of the Board’s original
Order herein of February
 15,
 1979.
 However, on May 13,
 1983
USEPA informed the Agency that
 in its opinion the Order of April
 21,
1983 could not be considered as part
 of the SIP submittal unless
a public hearing was held.
 Therefore,
 on May 18,
 1983 IPC filed
a motion with the Board requesting
 that a hearing be scheduled.
That motion was granted and hearing was held on July 22, 1983 at
which IPC presented two witnesses and the Agency presented none.
No members of the public testified.
 However, a letter from Steve
Rothblatt, Chief of the Air and Radiation Branch of Region V
of USEPA, did submit comments which were included
 in the record
and to which
 IPC responded on July
 27,
 1983.
54-01
—2—
Since the Agency’s presentation of the Board’s
 February 15,
1979 Opinion and Order as
 an amendment to the State
 Implementation.
Plan
 (SIP),
 USEPA has been reviewing
 the
 sufficiency of those
limitations and questions the use of a particular air quality
model with respect to its accuracy
 in predicting compliance with
 the secondary air quality standard.
 USEPA asserts
 that the
CRSTER model
 is superior to the MPSDM model
 in predicting
attainment of primary and secondary standards.
 IPC disagrees and
believes that it can prove that the MPSDM model
 is superior.
Both models have been used and both predict compliance with the
primary standard while only the CRSTER model predicts compliance
with the secondary standard.
 However,
 since USEPA agrees
with the Board that the limitation will
 assure compliance with
the primary sulfur dioxide standard,
 it has suggested that
 it
could approve the emission limitations for primary compliance as
a SIP amendment if the Board were to order a compliance schedule
for attainment of the secondary standard.
None of the evidence or testimony presented
 at hearing provides
any reason for the Board to alter
 its reasoning concerning the
disposition of this matter.
 As the Board stated in its April 21,
1983 Order,
 “holding a hearing to satisfy
 Rule 204(e) would be
perfunctory”
 in that “the original Rule 204(e) process,
 including
the hearing, provided a basis
 for the original Order” which
 is
less restrictive than the amended order requested
 at this time
(PCB 79—7 Order,
 p.
 2).
 The hearing did,
 in fact, elicit little
new,
 substantive information, and largely served to reaffirm
 IPC’s
 legitimate need for the requested relief,
 except for USEPA’s
comments which indicate that there may be some impediments
 to
USEPA approval
 of that relief as
 a SIP revision.
 In its response,
however,
 “IPC submits that USEPA’s Letter has not shown any basis
for the Board not to adopt the proposal.”
While the Board will not adopt an Order which
 is a nullity,
the Board agrees that the letter is not a sufficient basis for
denial.
 The SIP approval process
 is complex and denial cannot be
presumed on the basis of USEPA’s comment.
 IPC has taken the
position that
 it can adequately
 respond to USEPA’s concern, and
neither IPCB nor the Agency has recommended any modification
 of
the Order entered
 on April
 21.
 Since they, rather than the
Board, are the parties who must pursue the SIP revision,
 the
Board will not presume
 to substitute
 its judgment as to accepta-
bility of the Order as a SIP revision absent a compelling reason
to do so.
The Board,
 therefore, hereby reproposes the Order entered
 on
April
 21,
 1983 as set out below:
ORDER
It
 is the Order
 of the Pollution Control Board
 that:
1.
 Illinois Power Company be granted a site—specific mass
emission limitation
 for sulfur dioxide
 for its Baldwin Power
54-02
—3—
Plant of 101,966 pounds of sulfur dioxide
per
hour in the aggregate
and
an emission rate not to exceed 6 pounds of sulfur dioxide
per
~nil1ionBtu’s of heat input as determined pursuant to
Rule 204(e)(3);
2.
 Illinois Power Company shall submit to the Illinois
Environmental
 Protection
 Agency
 modeling
 and
monitoring
 demon-
stration(s)
 comparatively
 evaluating
 the ambient air quality
models known as CRSTER
 and
 MPSDM
 for
 purposes
 of
 determining
which model more accurately describes the ambient air quality
impact of
the
 Baldwin
 Plant.
3.
 The Illinois Environmental Protection
 Agency
 shall,
 as
part of its
permit
 review process, review the demonstration(s)
required by paragraph 2 hereof and determine whether it establishes
that the emission limitation in paragraph 1 provide for compliance
with primary and secondary ambient air quality standards.
a)
 If the Illinois Environmental Protection Agency
 concludes that primary and secondary compliance is demon-
strated,
 it shall notify the Board in
writing,
 and
 submit
the appropriate information to the United States Environ-
mental Protection Agency
 and
 thereafter paragraph
 4 hereof
shall have no further force and effect.
b)
 If the Illinois Environmental Protection Agency
concludes that
primary
 and
 secondary
 compliance
 has
 not
been demonstrated, subject to the review, and the decisions
on review provided for by the Illinois Environmental Protection
Act, Illinois Power Company shall comply with the provisions
of paragraph 4 hereof and Illinois Environmental Protection
Agency shall impose such permit conditions in the permits for
the Baldwin Plant as are necessary therefore.
4.
 Subject to the foregoing, the Illinois Power Company
shall undertake and implement as expeditiously as is practical,
but no later than
 December
 31, 1989, unless amended by further
order of this Board, a program at the Baldwin Plant to achieve
compliance with a sulfur dioxide emission limitation of 74,300
pounds
of sulfur dioxide
 per
 hour or such other limitation as
shall be determined in accordance with then applicable United
 States Environmental Protection Agency guidelines and requirements,
necessary
 to
 achieve
 compliance
 with
 the
 secondary
 sulfur
 dioxide
ambient
 air
 quality
 standards.
 The
 Illinois
 Environmental
 Protection
Agency
 may
impose
in
 operating
 permits,
 subject
 to
 review
 as
 provided
in
 the
 Illinois
 Environmental
 Protection
 Act,
 such
 reasonable
 interim
compliance
 and
 reporting
 progress towards fulfillment of the
requirements
 of
 this
 paragraph.
IT
 IS
 SO
 ORDERED.
54-03
—4—
I,
 Christan L.
 Moffett, Clerk of the Illinois Pollution
Control
 Board, hereby certif~ythat the above Order was adopted on
the ~~day
 pf
 ~
 1983
by
 a vote of
 ~S
~
Christan L. Moffe~/~er~
Illinois Pollution Con’t~oi Board
54-04