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<br />PART I <br />Page lm of 14 <br />Permit No. CO-0027154 <br />B. MONITORING REQUIREMENTS <br />4. Chronic WET Testing-Outfalls 001 005, 007 and 020 (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 whenever <br />1) there is a statistically significant difference in lethality between the control <br />and any effluent concentration less than or equal to the instream waste <br />concentration ("IWC") and, 2) the IC25, which represents an estimate of the effluent <br />concentration at which 25~ of the test organisms demonstrate inhibition as reflected <br />by lethality, is at any effluent concentration less than or equal to the IWC. The <br />IWC for this permit has been determined to be 100$. The permittee must provide <br />written notification of the failure of a WET test to the Division, along with a <br />statement as to whether a Preliminary Toxicity Investigation ("PTI")/Toxicity <br />Identification Evaluation ("TIE") or accelerated testing is being performed (see <br />Part I.B.4.(d)). Notification must be received by the Division within 21 calendar <br />days of the demonstration of chronic WET in the routine required test. <br />"Demonstration" for the purposes of Parts I.B.4(b),(c),(d) and (f) means no later <br />than the last day of the laboratory test. <br />Ic) Failure of Test and Division Notification (Seginninc 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 to <br />be 100. The permittee must provide written notification of the failure of a WET <br />test to the Division, along with a statement as to whether a Preliminary Toxicity <br />Investigation ("PTI")/Toxicity Identification Evaluation ("TIE") or accelerated <br />testing is being performed. Notification must be received by the Division within 21 <br />calendar days of the demonstration of chronic WET in the routine required test. <br />"Demonstration" for the purposes of Parts I.B.4(b),(c),(d), (e) and (g) means no <br />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 PTIfTIE investigation as described in Part I.B.4 .e, <br />or <br />(ii) conduct accelerated testing using the single species found to be more <br />sensitive. <br />Amendment No. 2 Issued 07/18/94 Effective 09/01/94 <br />Amendment No. 4 Issued Effective <br />