.
IEPAATTACHMENT NO.1LIi
Mr. Toby Frevert
Illinois EPA
- Bureau of Water
1021 North Grand Avenue East
P,O, Box 19276
Springfield, lllinois
62794-9276
Dear Toby:
Midwest Biodiversity Institute, Inc,
P,O, Box 21561
Columbus, OH 43221-0561
Please find attached a revision to Table 3 for the report entitled tiTemperature Criteria Options for the Lower
Des Plaines River" dated November 23, 2005 that we developed under a grant from EPA. We discovered some
inaccuracies in the table based
on recent discussions between Scon Twait and myself. The text discussion in the
report and the appendices that show the results
of the fish temperature derivation computations are correct, but the
numbers for the Secondary
Cont~ct/lndigenous
Species option in Table 3 is not - the enclosed revision brings Table
3 in line with the text and the appendices.
Please let me know if you have any questions,
Very truly yours,
Chris O. Yoder, Research Director
Midwest Biodiversity Institute
Center for Applied Bioassessment
&
Biocriteria
P.o, Box 21561
Columbus, OH 43221-0561
(614) 457-6000 [main]
(614) 457-6005
[fax]
(614) 403-9592
yoder@rrohio.com
cc:
Scott Twait, IEPA
Ed Hammer, Region V
CABB/MBl
Lower Des Plaines Temperature Criteria Options - REVISED
July 11, 2007
Table 3. Fish temperature model Outputs (OFlOC]) for fish species representative of a
modified use (two versions)
and the Secondary Contact/Indigenous Aquatic Life use
for
the Lower Des Plaines River. The long-term and short-term survival temperatures
represent
summer season Qune 16 - September IS) average and maxima.
Thermal
Category
Proportion of Representative Fish Species
100%
90%
75%
50%
Modified Use RAS
1
(includes
golden
redhorse)
Optimum
71.2 (21.8)
75.4 (24.1)
81.3 (27.4)
82.6 (28.1)
Growth (MWAn
71.5 (25.3)
81.0 (27.2)
85.8 (29.9)
86.7(30.4)
Avoidance (UAn
83.7 (28.7)
84.9 (29.4)
87.1 (30.6)
88.9 (31.6)
Survival (Long-term)
85.1 (29.5)
86.5 (30.3)
89.1 (31.7)
91.4 (33.0)
Survival (Shorr-rerm)
88.7 (31.5)
90.1 (32.3)
92.7 (33.7)
95.0 (35.0)
Modified Use RAS
2
(excludes golden redhorse)
Optimum
71.2 (21.8)
75.0 (23.9)
81.5 (27.5)
82.8 (28.2)
Growth (MWAn
77.5 (25.3)
80.6 (27.0)
85.8 (29.9)
86.9 (30.5)
Avoidance (UAT)
83.7 (28.7)
85.6 (29.8)
87.4 (30.8)
89.1 (31.7)
Survival (Long-term).
85.1 (29.5)
86.5 (30.3)
89.8 (32.1)
91.4 (33.0)
Survival (Short-term)
88.7 (31.5)
90.1 (32.3)
93.4 (34.1)
95.0 (35.0)
Secondary Contact/Indigenous Aquatic Life
Optimum
81.5 (27.5)
81.7 (27.6)
81.9 (27.7)
82.1 (27.8)
Growth (MWAn
84.5 (29.1)
85.3 (29.7)
86.0 (30.0)
86.5 (30.3)
Avoidance (UAT)
87.3 (30.7)
87.5(30.8)
88.3 (31.3)
88.9 (31.6)
Survival (Long-term)
86.7 (30.4)
887 (31.5)
90.3 (32.4)
91.2 (32.9)
Survival (Short-term)
90.3 (32.4)
92.2 (33.5)
93.9 (34.4)
94.8 (34.9)
