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PART I Page ix Permit No. CO-0043567 Fl. MONITORING REQUII2ENIENTS 4. Chronic WET Testine-Oulfalls 001. 002 ahd 003 (continued) (z) Request For Relief The permittee may request relief from further invzstigation and testing where the toxicant has not been determined and suitable treatment does not appear possible. !n requesting such relief, the permiltez shall submit material sufficient to establish the following: (i) It has complied with terms and conditions of the permit compliance schedule Cor the PTIrI'IE invzstigalion and other appropriate conditions as may have bzen required by the Division; (ii) During the period of the toxicity incident it has bezn in compliance with all other permit conditions, including, in the case of a POTW, pre-treatment requirzments; (iii) During the period of the toxicity incident it has properly maintained and operated all facilities and systzms of treatment and control; and (iv) Despite the circumstances describzd in paragraphs (i) and (iii) above, thz source and/or cause of toxicity could not be locatzd or rzsolved. If dzemed appropnate by the Division, the permit or thz compliance schedule may be modified to rzvise the oneoine monitoring and toxicity invzsugation roquirzments to avoid an unproduc(ivz expzndilure of the permit(ee's resourczs, provided that the underlying obligation to ehmmate any continuing exceedance of the toxicity limit shall remain. (f) Spontaneous Disappearance If toxicity spontaneously disappears at any lime after a test failure. The permittee shall notify the Division in writing within 14 days of a demonstration of disappearancz of the toxicity. The Division may rzyuire thz permittee to develop and submit additional information which may includz, but is not limited to, the results of additional testing. If no pattern of toxicity is identified or recurring toxicity is not identified, the toxicity incident response is considered closed and normal WET testing shall resume. (g) Toxicity Reopener This permit may be reopened and modified (following proper administrative proczdures) to includz new compliance dates, additional or modified numerical permit limitations, a new or different compliance schedulz, a change in the whole zfFluent toxicity testing protocol, or any other conditions rzlated to the control of toxicants if one or more of the following events occur: (t) Toxiciq• has bzzn dzmonstratzd in the rfFluent and the permit dots not contain a toxicity limitation. (ii) Thz PTI/TIE results indicate that the toxicant (s) represent pollutant(s) that may bz controlled with specific numerical limits, and the Division aerees that the numzncal controls are the most appropriate course of action. Qu) Thz PTI/TlE rzvzals other unique conditions or characteristics which, in thz opinion of the Drviison, justify [hz incorporation of unanticipatzd special conditions in the permit. (n•) The Division may rzopen this permit and impose chronic toxrity limits where chronic toxicity is idzntificJ. C. DEFINITIONS OF TER\IS I. "Composrtr" samplz is a minimum of four (4) grab samplzs collzcted at equally space) hvo (2) hour intervals and piuportiuned accordm ~ to tlow. '_. "Continuous" mzasurement, is a measurzment obtained from an automatic rocordine dzvice which continually measures provides measurements. ;. "Chronic Irihalin~" oc.;urs whin a ,tatisticulh~ sienificam Jif(rrenez, a[ the 9~°o confiJencz ICVCI, OCCnrti in thz chronic test bct~aezn the mortuht~ of the te,t specie, m IOOS ef(7 urnt (thz chronic I~VC 100 Si) :md thz control. ~I "Daih~ Maximum hmiUtion" mzans thz limitation for this parameter shall be applied as an instantaneous maximum (or, li+r pl I or DO, mstantanzous minimum) value. The instantaneous valuz is defined as the analytical result of am' individual <;unple. Dlv1 Rs shall include thz maximum (and/or minimum) of all mstancmruus v:+lues within the calendar month. Anv in<t:mt:meous value beyond the noted d:nly maximum limitation for the mdirurd parameter shall hr considered a violin tun of ihn permit. i. `G~.~h" ~.i ntplr. i< a single "Jip and ta4:e" sample w av m he rcprexrn uiticc tit the parameter brin_ munuorrJ.