PERMFILE43057

• Permit No: C1981012A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 22 NPDES PERMIT
• Media Type: D
• Archive: Yes

Part I
Page 1L of 19
Permit No. OC-0000906
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B. NIk7PIORtTIG REQ[JIRfI+fE27I5
11. Toxicity Incident Closure
If WET is controlled through iag~lementation of rnnreric limits for
specific toxicants, through a control program eliminating toxicannts from
the waste stream, or thrax~r the implementation of treatment prooPSSes,
or if WET disappears and Division required accelerated testing
deemonstiate the continued absence of toxicity, the toxicity incident
shall be considered closed.
If the permittee completes all required phases of the toxicity incident
response specified in compliance ~+~>>es, and is unable either to
identify the causative toxicants and their saixres or to identify
feasible treatment options, the permittee may petition the Division for
relief from further investigation and testing, consistent with the
permit regulations.
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12. frequency and Sample Type -Chronic WET Testing - Outfalls 001 and 009
The monitoring frequency for chronic toxicity tests shall be once every
six months on a January -June, July - Decanber sequence, and cannot
coincide with acute testing. The first such test must be ocaq~leted in
Jtme and reported on the II+IIt due July 28. Chronic tests will be static
replacement tests using three o~osite effluent sales, each of which
is to be composited for a n+~n~*+*~ of eight haul. Chronic testing will
be conducted with both Ceriodaphnia sp. aryl fathead minnows during the
first year. Acing Years two and three, if requested in writing by the
permittee, the Divsion may grant relief from continued two species
testing. Such relief shall be for corrti.rnbed testing with only that
species which has demonstrated the greatest sensitivity during the first
year of testing. are results shall be submitted on the Chronic Toxicity
Test report form, available from the Division. Copies of these reports
are to be submitted to both the Division an3 EPA.
After September 30, 1993, the dirnaiic testing requirenents will no
longer be required unless applicable regulations require inclusion of a
chronic toxicity limit.
are permittee shall conduct each chronic toxicity test in general
acoordarioe with methods described in the Division guidance document
entitled Guidelines for Cbrductira Whole Effluent Toxicity Tests.
As general information, chronic toxicity occurs when there is a
statistically significant difference in survival, growth or reproduction
for either species.
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