Laserfiche WebLink
PART I <br />Page 14 <br />Permit No. CO-0078776 <br />B. MONITORING REQUQtEMENTS <br />4. Chronic WET Testin¢ - Outfall 012. (continued) <br />(iv) Despite the circumstances described in paragraphs (i) and (iii) above, the source andlor cause: of toxicity <br />could not be located or t'esolved. <br />If deemed appropriate by [he Division, the permit or the compliance schedule may be modified [o revise [he ongoing <br />monitoring end toxicity investige'tion requirements to avoid an unproductive expenditure of the permit[ee's resources, <br />provided that the underlying obligation to eliminate any continuing exceedance of the toxicity limit shall remain. <br />(f) Spontaneous Disaonearance <br />If toxicity spontaneously disappetlrs at any time after a test failure, the permittee shall notify the Division in writing <br />within 14 days of a demonstration of disappearance of the toxicity. The Division may require the permittee to <br />develop and submit additional Information which rtlay include, but is not limited to, the results of additional testing. <br />1(no pattern of toxicity is identified or recurring toxicity is not identified, the toxicity incident response is <br />considered closed and normal WET testing shall resume. <br />(g) Toxicity Reaaener <br />This permit may be reopened and modified (following proper administrative procedures) to include new compliance <br />dates, additional or modified numerical permit limitations, a new or different compliance schedule, a change in the <br />whole effluent toxicity testing protocol, or any other conditions related to the control of toxicants if one or more of <br />the following events occur: <br />(i) Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation. <br />(ii) The PTI/TIE results indicate that the toxicant (s) represent pollutant(s) that may be controlled with specific <br />numerical limits, end the Division agrees [het the numerical controls are the most appropriate course of <br />action. <br />(iii) The PTIl1'IE reveals other unique conditions or characteristics which, in the opinion of the Division,.jrlstify <br />the incorporation of unanticipated special conditions in the permit. <br />(iv) The Division may reopen this permit and impose chronic toxicity limits where chronic toxicity is identified. <br />C. DEFINITIONS OF TERMS <br />I. "Acute Whole EfFluent Toxicity" exists whenever the LCso, which represents an estimate of the efFluent concentration <br />which is lethal to 5070 of the test organisms in the time period prescribed by the lest, is found to be less than or equal to <br />10070 effluent. <br />2. "Composite' sample is a minimum of four (4) grab samples collected at equally spaced two (2) hour intervals and <br />proportioned according to flow. <br />3. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually provides <br />measurements. <br />4. "Dally Maximum limitation" means the limitation for this parameter shall be applied as an instantaneous maximum (or. <br />for pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any <br />Individual sample. DMRs shall include the maximum (and/or minimum) of all instantaneous values within the calendar <br />month. Any instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall he <br />considered a violation of this permit. <br />IN UIII'.419/93 <br />