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COLOR,4D0 DEPARTl1ENT OF PUBLIC HEALTH AND ErW1RONh1ENT, Rarer Q,enGn Control Diviston <br />Amendment No. ~-Rationale. Page 6. Permit ,Vo. C0 000013? <br />• <br />Jfa level of chronic toxicity occurs. such that dtere is a stanstically signtficmv dtfferenre in the lethality <br />(at dte 95% confidznce level) between the control and any effluent concenrrntiort less rltnn or equal m <br />d+e Ins[reant LVasre Concentration (IWCJ and tfrhe 1C,, < the IL4'C, the permittee roil! be regrared ro <br />follow the automn[ic compliance schedule Identified in Parr LA. ~. (cJ of the permit, tJ the observed <br />toxtriry is due ro orgnntsm lethality. Jf the toxidry is due to differences in the growdt of [he fathead <br />mhutorvs, no inunedinte acaon on the parr ojdte permittee will 6e required. However, this utcidetu, <br />along with other 6VET data, will be evn[unted by dte Diviston and ntaV form dre basis for reopentrtg the <br />pernur and mduding addttional LVET limits or od+er requirements. <br />~J) Genera[ Jn(onnntmn: The permittee should read the WET testing secnons under Parr 1.A.~. of d+e <br />permit careftdly. The permit outlines the test requirements mtd the required follow-up actions the <br />penni«ee must rake to resolve a toxicity incident. Tl+e pernttee should read, along with the douunents <br />listed m Part l.A.S. (aj of the permit, the Colorado Water Quality Control Division Biomonitorine <br />Gutdartce Document, dated Ady I. 1993. This document orulines the criteria used by the Division in <br />srtclt areas as granting relief from WET testing, modifying test methods and changing test species. The <br />permittee should be aware that some of the conditiarts outlined above may be subject to change ijtl:e <br />facility experiences a change in discharge, as outlined in Pnrt II.A.2. of the permit. Sttclt changes shall <br />be reported to tJte Division immediately. <br />B. rNonitoring <br />!. Ef(letent Monitorin¢: Effluent monitoring will be required as shown in Table VI-3. Refer to the permit for the <br />location ojthe monitoring point. <br />L.J <br />Table VI-3 -- IYlonitoring Requirements <br />Parameter Measurement Frequency Sampte Type <br />Flow, MGD Weekly <br />Total Suspended Solids, mg/P Monthly <br />Total Iron, mg/? Monthly <br />Oi! and Grease, mg/P Weekly <br />pH, s.tt. Weekly <br />Tara[ Dissolved Solids, mg/P Quarterly <br />Instantnneous or Continuous <br />Grab <br />Grab <br />Visual a/ <br />In-situ <br />Grab a/ <br />a/ Jfa visible sheen is noted at any time, a grab sample shall be collected and analyzed for oil and grease. <br />The results are to be reported on the DMR under parameter 03532. <br /> <br />2. Additional Monirorine T]te permittee submitted copies ojseveral analyses of wells in the vicinity and cttrrertr <br />mine wales autfall number Oll. However, there is no wny ro rnoni[or die new outfall 015 nt this time since <br />discltnrge has yet to contmertce. TJte Division mast review analytical resrtlts of specific parameters from the <br />ncaral discharge before determining whetter additional limitations aad/or conditions are required. The permit <br />will require thnt si,x grub samples be collected on a monthly basis beginning on commencement of the new <br />discharge. The parameters are torn[ recoverable arsenic, torn! recovernble cadmium, dissolved trop, and <br />dissolved manganese. As soon as the resrtlts ofnll six analyses ore available to the permittee. rite results sftnll <br />be mbulated m a letter and submitted to the Division. TFte predicted due date for submission of this comphmtce <br />uem is September 1. ?000. If sampling is delayed jot reasons beyond the permirtee's control, such as a period <br />of no discharge rvitltin the designated sanip[ing period. the permittee shall notify the Diviston ut writing. <br />utdicatirtg the renson for die delay and die ndjusted projeued subnussion dote <br />