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HYDRO27562
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Last modified
8/24/2016 8:46:59 PM
Creation date
11/20/2007 8:08:53 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Hydrology
Doc Date
3/31/1998
Doc Name
AUTHORIZATION TO DISCHARGE UNDER COLO DISCHARGE PERMIT SYSTEM
Permit Index Doc Type
NPDES
Media Type
D
Archive
No
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PART I <br />Page lm of 14 <br />Permit No. CO-0027154 <br />B. MONITORING REQUIREMENTS <br />4. Chronic WET Testing-Outfalls 001. 005 and 007 (continued) <br />(b) Failure of Test and Division Notification (Prior to Effective Date of Limitation) <br />Prior to the effective date of the limitation, a chronic WET test is failed <br />whenever 1) there is a statistically significant difference in ~ethality between <br />the control and any effluent concentration less than or equal toy e-instream waste <br />concentration ("IWC•) and, 2) the IC25, which represents an estimate of the effluent <br />concentration at which 25X of the test organisms demonstrate inhibition as <br />reflected by lethality, is at any effluent concentration less than or equal to the"' <br />IWC. The IWC for this permit has been determined to be 100X. The permlttee must <br />provide written notification of the failure of a WET test to the Division, along <br />with a statement as to whether a Preliminary Toxicity Investigation <br />(•PTI")/Toxicity Identification Evaluation ("TIE') or accelerated testing is being <br />performed (see Part I.B.4.(d)). Notification must be received by the Divi:ian <br />within 21 calendar days of the demonstration of chronic VET in the routine required <br />test. "Demonstration" for the purposes of Parts I.B.4(b),(c),(d) and (f) means no <br />later than the last day of the laboratory test. <br />(c) Failure of Test and Division Notification lBe¢innin¢ on Effective Date of <br />Limitation) <br />Beginning on the effective date of the limitation, a chronic WET test is failed <br />whenever there is a statistically significant difference in lethality between the <br />control and any effluent concentration less than or equal to the instream waste <br />concentration (•IWC"). The IWC for outfalls 001, 005 and 007 has been determined <br />to be 100X. The pezmittee must provide written notification of the failure of',a <br />WET test to the Division, along with a statement as to whether a Preliminaryry <br />Toxicity Investigation (•PTI")/Toxicity Identification Evaluation ('TIE") or <br />accelerated testing is being performed. Notification moat be received by the <br />Division within 21 calendar days of the demonstration of chronic VET in the routine <br />required teat. 'Demonstration" for the purposes of Parts I.B.4(b),(c),(d), (e) and <br />(g) means no later than the last day of the laboratory test. <br />(d) Automatic Compliance Schedule Upon Failure of Test <br />If a routine chronic WET test is failed, regardless of whether the limit is in <br />effect, the following automatic compliance schedule shall apply. As part of this <br />the permittee shall either; <br />(i) proceed to conduct the PTI/TIE investigation as described in Part I.B.4.e, <br />or <br />(11) conduct accelerated testing using the single species found to be more <br />sensitive." <br />Amendment No. 2 Issued D7./~•j~/ Effective ~.O/.~t/ <br />
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