2001-12-11_PERMIT FILE - C1980007A ‎(4)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Old Permits
• Section_Exhibit Name: Exhibit 07 NPDES Permits
• Media Type: D
• Archive: Yes

PARTI
Page 12
Permit No. CO-0038776
B. MONITORING REQUIREMENTS
3. Acute WET Testing - Outfalls 002. 004. 011 and 013 !continued)
(i) Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation.
(ii) The PTI/TiE results indicate that the tozican[ (s) represent pollutant(s) that may be controlled with specific
numerical limits, and the Division agrees that the ntmerical controls aze the most appropriate course of
action.
(iii) The PTI/TIE reveals other unique conditions or characteristics which, in the opinion of the Division, justify [he
incorporation of unanticipated special conditions in the permit.
4. Chronic WET TestinE - Outfa11012
(a) Testing and ReponinP Requirements
Tests shall be done at the fregt~ncv listed in Part I.B.1. Test results shall be reponed on the Discharge Monitoring
Repon (DMR) submitted for the repotting period during which the sample was taken. (i.e., WET testing results for
the first calendaz quarter ending March 31 shall be reponed with [he DMR due April 28.) The results shall be
submitted on the Chronic Toxicity Test report form, available from the Division. Copies of these repons aze to be
submitted to both the Division and EPA along with the DMR.
The permittee shall conduct each chronic WET test in general accordance with methods described Short Term
• Methods for EstimatinE the Chronic Tonicity of Effluents and Receiving Waters to Freshwater Or anisms,
EPA/600/4-89/001 or the most current edition, except as modified by the most current Division guidance document
entitled Guidelines for Conducting Whole Effluent Toxicit~ests. The permittee shall conduct such tests using
Ceriodaphnia dubia and fathead minnows.
(b) Failure of Test and Division Notification
Beginning on [he effective date of this permit, a chronic WET test is failed whenever there is a statistically significant
difference in lethality between the control and any effluent concentration less than or equal to the instream waste
concentration ("IWC"). The iWC for this permit has been determined to be 100%. The permittee must provide
written notification of the failure of a WET test to [he Division, along with a statement as to whether a Preliminary
Toxicity Investigation ("PTI")/Toxicity Identification Evaluation ("TIE") or accelerated testing is being performed.
Notification must be received by the Division within 21 calendar days of the demonstration of chronic WET in
the routine required test. "Demonstration" for [he purposes of Parts I.B.4(b),(c),(d), (e) and (g) means no later than
the last day of the laboratory test.
(c) Automatic Compliance Schedule Upon Failure of Test
If a routine chronic WET test is failed, the following automatic compliance schedule shall apply. As pan of this the
permittee shall either:
(i) proceed to conduct the PTI/TIE investigation as described in Part 1.B.4.e, or
(ii) conduct accelerated testing using the single species found to be mare sensitive.
If accelerated testing is being performed, the permittee shall provide written notification of the results within l4
• calendar days of completion of the "Pattern of Toxicity"/"No Toxicity" demonstration. Testing will be at least
once every two weeks for up to five tests until; 1) two consecutive tests fail or three of five tests fail, in which case a
pattern of toxicity has been demonstrated or 2) two consecutive tests pass or three of five tests pass, in which case no
pattern of toxicity has been found.
See Part I.C. for Definitions. Amendment No. 2 Issued FEB 7 9. 1 997 Effective APR O 7 . 7 997