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_. ___ -__-~~,-_ PRAT 11 <br />i• _ . <br />Page ro <br />Permit No. CO-0OJ 6024 <br />B. MONITORING REQUIREMENTS <br />3. an tr WFT TPCting-(lntfallc 0n4, OJQ~nnd n9K (continued) <br />If deemed appropriate by the Division, the permit or the compliance schedule may be modified to revise the ongoing <br />monitoring and toxicity investigation requirements to avoid an unproductive expenditure of [he pemuttee's resources, <br />provided that the underlying obligation to eliminate any continuing exceedence of the toxicity limit shall remain. <br />(f) ~nnntanrnna Dicanpearance <br />If toxicity spontaneously disappeazs at any time after a test failure, the pemtittee shall notify [he Division in writing within 14 <br />days of a demonstration of disappearance of the toxicity. The Division may require the pemuttee to develop and submit <br />additional information, which may include, but is not limited to, the results of additional testing. If ao pattern of toxicity is <br />identified or recurring toxicity is no[ identified, the toxicity incident response is considered closed and normal WET testing <br />shall resume. <br />(g) Tnx'r' Re^~rnwr <br />This peanit may be reopened and modified (following proper adrnhusnative procedures) to include new compliance dates, <br />additional or rswdified numerical permit limitations, a new or different compliance schedule, a change in Eae whole effluent <br />toxicity testing protocol, or any other conditions related to the connol of toxicants if one or more of dse following events <br />occur: <br />(i) Toxicity has been demonstrated th 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 numerical <br />limits, and the Division agrees4hat the numerical controls are the most appropriate course of action. <br />(iii) The PTLTIE reveals other unique conditions or characteristics, which, in the opinion of the Division, justify the <br />incorporation of unanticipated special conditions in the permit. <br />C. DEFINITIONS OF TERMS <br />1. "Acute Whole Effluent Toxicity" exists whenever the LCso, Which represents an estimate of the effluent coacennation which is <br />lethal to 50% of the test organisms in the time period prescribed by the test, is found to be less than or equal to 100% effluent. <br />2. "Composite" sample is a mirtimum of four (4) grab samples collected at equally spaced two (2) hour intervals and proportioned <br />according to flow. <br />3. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures provides <br />measurements. <br />4. "Daily Maximum limitation" means the limitation for this pazameter shall be applied as an instantaneous maxirnunt (or, for pH or <br />DQ, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any individual sample. DMR's <br />shall include [he maxirrnrtn (and/or minimum) of all instantaneous values within the calendar month. Any instantaneous value <br />beyond the noted daily maximum limitation for Ute indicated parameter shall be considered a violation of this pemut. <br />5. "Grab" sample, is a single "dip and take" sample to be representative of the parameter being monitored. <br />6. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of discharge. <br />7. "instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring <br />facilities. <br />• 8. "Quarterly measurement frequency" means samples may be collected at any time during the calendar quarter if a c ontinual <br />discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that discharge occurs. <br />